# Siam Physics Congress 2017

Asia/Bangkok
Rayong Marriott Resort & Spa

#### Rayong Marriott Resort & Spa

http://www.marriott.com/hotels/travel/bkkrr-rayong-marriott-resort-and-spa/ Rayong, Thailand
Description

## --- Physics Beyond Frontier ---

Co-organizers

Registration
Siam Physics Congress 2017
Participants
• Achara Phuagprapun
• Achaya Teppitaksak
• Aekgaran Sangmala
• Akkarach Sukserm
• Akkawat Ruammaitree
• Amancio II Manceras
• Amorn Thedsakhulwong
• Ampaiwan Marutaphan
• Anan Saenkhamai
• Anongnart Sonthila
• Anongnart sonthila
• Anupong Sukee
• aparporn sakulkalavek
• Apichaya Chanklud
• Ar-si Dramae
• Arisara Boontum
• Arrak Praprom
• Arthit Jityen
• Artit Chingsungnoen
• Atchara Punya Jaroenjittichai
• Atcharawon Gardchareon
• Atirat Maksuwan
• Attaphol Karaphun
• Atthaporn Ariyarit
• Aukrit Natkaeo
• Authit Phakkhawan
• Auttakit Chatrabhuti
• benjamas ponboonjaroenchai
• Benjo Fraser
• boonlit krunavakarn
• Boonyaluk Namnuan
• Boonyarit Chatthong
• Bundasak Angmanee
• Burin Gumjudpai
• Busara Pattanasiri
• butsaporn saelim
• Chaipattana Saisa-ard
• Chaiyawat Kaewmeechai
• Chakrit Saengkorakot
• chalit Muanglay
• Chalongchai Teevasuthornsakul
• Chalongwut Boonpratum
• CHamp Pongsathorn
• Champ Suksawat
• Chanikan Aroonnithi
• chanoknan rattanabut
• Chanwit Kataphiniharn
• Chatchai Kuabut
• Chatchai Putson
• Chatchai Sirithipvanich
• Chayanin Sararat
• Chivalrat Masingboon
• CHOKCHAI JAEWIJARN
• Chonticha Chunhakit
• Chonticha Kritpetch
• Chumpol Supatutkul
• Chunyapuk Kukusamude
• Duangkamol Dangphonthong
• Dulayawich Palaporn
• dumrongsak rodphothong
• dusit ngamrungroj
• Ekkachai Kongmon
• Farung Surina
• Gerda Rogl
• Gp.Capt. Srithus Chaimee
• Grittiya Pongsupa
• Gurpreet Singh Chahal
• Haruthai Nau-on
• Hiroshi Isono
• Intuon Chatratin
• Jakkree Boonlakhorn
• jamon wasuratmanee
• Jan Fronimarc Viloria
• Jatechan Channuie (Tung)
• Jathurawit Mateewattanakul
• Jidapa Mogmued
• Jinda Sinlapanuntakul
• Jintana Pakdeewanich
• Jintawat Tanamatayarat
• jiramate kitjanon
• Jiraporn Promping
• JIRAYU MONGKOLKIATTICHAI
• Jirayu Tachapitunsuk
• Jita Vachabuskorn
• Jiti Nukeaw
• Jittrathep Sukultanasorn
• Jongrak Sanglao
• Jureeporn Yuennan
• Juthatip Sriwongsa
• Kamolporn Haewsantati
• Kanchanok Phoophathong
• Kanogkwan Sawaengsai
• Kanokwan Boonsook
• Kanokwan Chongcharoen
• Kanpatom Kasonsuwan
• Kanyaporn Thubthong
• Kanyarat Kesrisom
• Kasamson Suksamai
• Keerati Maneesai
• Kessararat Ugsornrat
• Kewalin Thongpoyai
• Khachiwan Buakor
• Khamphee Karwan
• Khamson Keothongkham
• Khanti Toedtanya
• Khemsinan Gunsriwiwat
• Kiattipong Kamdee
• Kittikul Kovitanggoon
• Kittipat Malakit
• Kittipitch Yooprasertchuti
• Kittipong Techakaew
• Kittisak Ketaiam
• Kittisun Mongkolsuttirat
• Kittiya Kosaentor
• Klichchupong Dabsamut
• Kodchakorn Simalaotao
• Korkuson Masaen
• Korntip Tohsing
• Kotchaphan Kanjana
• Kriengkri Timsorn
• Kristiya Tomuang
• Kritsana Khaothong
• Kyu Yoshimori
• Laksika Chumphuin
• Likit Temprom
• likkhasit Wannasen
• Mali Nachaisin
• Maliwan Deeprom
• Manas Sittishoktram
• Manit Klawtanong
• Manot Lakkham
• Meechai Thepnurat
• Meliton Chiong III
• Methawee Duangthanu
• Metinee Phantu
• Monthakarn Chanthiwong
• Montree PAKKRATOKE
• Mudtorlep Nisoa
• Murnee Daoh
• Nakarin Jayjong
• Nakorn Kumchaiseemak
• Nantarat Srisuai
• NAPAKAN WONGPANIT
• Napaporn A-thano
• Nareemas Chehlaeh
• Narenrit Thananusak
• Narin Chanthawong
• Narumon Suwonjandee
• Narupon Chattrapiban
• Natnicha Thamcharoenrat
• nattakan kanjana
• Nattamon Suwannaharn
• Nattapong Chuewongkam
• Nattawoot Maleelai
• Natthakan Thanapreechanan
• Natthapong Monarumit
• Natthawat Phanchat
• Natthawut Wongjanta
• Nattida Kanlayaprasit
• Nawarat Seetapong
• nikorn shinsuphan
• Nipaporn Sriplai
• Nipon Thangprasert
• Nititorn Kenyota
• Nittaya Sunganun
• Nongluck Houngkamhang
• Nonthanan Sitpathom
• Noparat Phungyimnoi
• Nopparit Changkit
• Noravee Kanchanavatee
• Nudchanard Saenpuk
• Nuengruathai EKthammathat
• Nuttanan Tanasanchai
• Nuttawat Parse
• Nutthapong Discharoen
• Oliver Generalao
• ONSUDA ARAYAWUT
• Pachara Jolutsakul
• Pairin Ponchaiya
• Panakamon Thonglor
• Panapol Kanjanaphomchom
• Panjasil Payakaniti
• PANYA Khaenamkaew
• Paparin Jamlongkul
• Papatsorn Aumjira
• Papitchaya Paluk
• Parinya Duangklang
• Patanachai Janthon
• Patapong Panpiboon
• Patcha Chatraphorn
• Patipan Uttayarat
• Patompob Pakeetood
• Pattana Somroob
• Pattaranipa Gunhakoon
• Pawika Utvaing
• Peera Champathet
• Peerapong Yotprayoonsak
• Peter Rogl
• Phansiri Boonnoy
• Phichayoot Baisri
• Phrudth Jaroenjittichai
• Phudit Sombutsirinun
• Phumipat Kittiboonanan
• Phusit Nualpijit
• Phuthidhorn Thana
• Pichainarong Boonprasert
• Pimchanok Ieamviteevanich
• PINIT KIDKHUNTHOD
• Pipat Harata
• Pipat Harata
• Piraya Wetchasat
• Piriya Praneekit
• piroonrat peawbang
• Pisan Sukwisute
• pisut thantong
• PISUTTI DARARUTANA
• Pitchanunt Chaiyo
• Pitchaporn Jivanantaka
• Piten So
• piyachat wungmool
• Piyawan Leepheng
• Piyawat Kaewjaijong
• Piyawath Tapsanit
• Plaifhon Pooyooyen
• Ponthip Chaiyabin
• Poonnaphob Sopapan
• Poramaporn Ruksasakchai
• Poramed Wongjom
• Poramin Sintham
• Pornchai Chinnasa
• Pornjuk Srepusharawoot
• Pornkamon Nalakarn
• Pornrat Wattanakasiwich
• PORNSAWAN SIKAM
• Porntiwa Pontong
• Poumin Dilekrojanavuti
• Pranlekha Traiwatcharanon
• Prasit Thongbai
• prathan prachopchok
• Prathan Srivilai
• Puwis Amatyakul
• Ramon Songtanasit
• Rangsan Panyathip
• Ratchaphat Nakarachinda
• Ratchatapong Lukmuang
• Rattakarn Yensano
• Rattanachai Kowong
• Raymond J. RITCHIE
• Rewattee Satee
• Richard Lindgren
• Ritsuko Yoshimori
• Rob Knoops
• Ronald Macatangay
• Ronald Macatangay
• Roppon Picha
• Ruchipas Bavontaweepanya
• Rudeerat Suntako
• Rungsin Kongkerd
• Sahussa Peengam
• Sakchai Chomkokard
• SAKCHAI RACHNIYOM
• Sakdawoot Maungkorn
• Sakdithut Jitpienka
• Sakhorn Rimjaem
• Saksilpa Srisukson
• Saksith Jaksri
• Sakuntam Sanorpim
• Samana Peingbangyang
• Samuk Pimanpang
• Saowalak Somjid
• Saowaluk Sodchuen
• Sarawut chulok
• Sarinrat Wonglee
• Sarun Phibanchon
• Sawanee Jitphayomkun
• Sayamon Kaewsopa
• Sayan Phokate
• Sean Chen
• Sikarin Yoo-Kong
• Siramas Komonjinda
• Sirapat Lookrak
• Siraprapa Sanpa-arsa
• Sirawut Natyanun
• Sirichok Jungthawan
• Sirikorn Pongtornkulpanich
• Sirinthip Sitthisart
• Sirinun Sirikunkitti
• siripassorn sukhkhawuttigit
• Siriratchanee Thammasuwan
• Siritorn Buranurak
• Siriwan Pakluea
• Sitichoke Amnuanpol
• Sitthipong Yapo
• Sittichain Pramchu
• Sittiporn Dueantakhu
• Siwarut Ploydang
• Sofia Liming
• Sojiphong Chatraphorn
• Somkuan Photharin
• Somphoach Saichaemchan
• Somporn Somroob
• Somruedee Satitkune
• Somsak Dangtip
• Songklod Punyawarin
• Sorawich Maichum
• Sorawit Changsalak
• Sorawit Sanin
• soraya ruangdit
• Subaidah A wae
• Suklitta Thongkhem
• Sumaman Buntoung
• Sumet Sakulsermsuk
• Suminya Teeta
• Sumit Jirungnimitsakul
• Supachai Awiphan
• Supalak Kongsri
• Supanat Sasipongpana
• Supasin Sukara
• Supattra Wongsriya
• Supree Pinitsoontorn
• Surachat Sombat
• Surachate Limkumnerd
• Surapit Tabtiang
• surasak loekkesee
• Surawut Wicharn
• Suriya Lawan
• Suriya Phankosol
• SUTHASINEE ANUSORNHIRUNKARN
• Suthasinee Somboonsap
• Suthima Fankrua
• Suvipak choomdaeng
• Suwakan Piankoranee
• Suwicha Wannawichian
• suwit wongsila
• Tanabodee Kaewwichian
• Tanachai Ponken
• Tananut Sanghong
• Tanatsaparn Tithito
• Tanawut Rittidach
• Tatnatchai Suwannasit
• Taworn Intaro
• Teanchai Chantakit
• Teantong Chonsut
• Teepkorn Mukda
• Teerachote Pakornchote
• Teeranat Pantasri
• Teerapat Lapsirivatkul
• Teerayut Loylip
• Thana Sutthibutpong
• Thanagrit Wongpanit
• thananan phetkongtong
• THANAPORN THUMSA-ARD
• Thanat Sangkhakrit
• Thanayut Kaewmaraya
• Thanida Sujarittham
• Theerawat Bunfong
• Thidarat Wangkam
• Thiranan Sonkaew
• Thiranee Khumlumlert
• Thittima Thunyaniti
• Thutiyaporn Thiwawong
• Trithos Rojjanason
• Udom Peanpunga
• Umporn Wutchana
• Uthed Achathongsuk
• varunee paktramook
• Vichawan Sakulsupich
• Vichayanun Wachirapusitanand
• vichuda sattayarut
• VIKANDA CHANCHANG
• Wachirawit srisa-nga
• Wanchaloem Poonsawat
• wannakan Sathongsang
• Waraporn Nuntiyakul
• Waraporn Thongkongoum
• Warut Singseeta
• Wasan Maiaugree
• Wasan Pinate
• Wasin Nupangtha
• Wasinee Khuntawee
• Watanyu Foosang
• watchara liewrian
• Watcharanon Kantayasakun
• Watchareeya Chaiyarat
• wattana tuichai
• Watthana Sriklin
• Watunyoo Patwong
• Weeranut Kaewwiset
• Wichaid Ponhan
• Wichian Ratanatongchai
• Wimalin Laosiritaworn
• Witheetat Amatyakul
• Withun Sutham
• Wittaya Thipaksorn
• Wiwat Youngdee
• Wiwittawin Sukmas
• Wuttiphong Thongpakdi
• Wuttiphong Thongpakdi
• Yaowapa Howold
• Yingyot Infahsaeng
• Yongyut Laosiritaworn
• Yotsarayuth Seekaew
• Yuki Sato
• กมลชนก หวังเจริญ
• ปริญญา สาเพชร
• สถาพร สาภา
• อนุสรณ์ ตองอ่อน
• ฺBudsapawan Sophonritthidet
• เจนอนันต์ คำศรี
• ๋Jariya Buajarern
• ์NATTHA SRIWITHOON
Support
• Wednesday, 24 May
• 08:00 09:30
Registration Grand Ballroom ()

### Grand Ballroom

• 09:30 10:00
Opening ceremony Grand Ballroom ()

### Grand Ballroom

• 10:00 10:15
Group photos
• 10:15 11:15
Plenary Talk I: Prof. Dr. Matthias Steinmetz Grand Ballroom ()

### Grand Ballroom

• 10:15
The Milky Way as a cosmological laboratory 50m

The Milky Way is the galaxy we can dissolve in its indivudual constituents and thus study in most detail. The abundances of individual chemical elements in stars reflect the chemical composition of the gas at the location and time of their formation. The combined stellar record of the Galaxy can thus be used to analyze its resolved star formation history. The motions of the Galaxy’s stars can be used to study the accretion history and thus allow to identify remants of accreted and tidally disolved dwarf galaxies. The motions also allow to weigh the various components of the Milky Way and are thus of critical importance to analyze the distribution of dark matter.

The past decade has seen several major efforts to measure chemical abundances for more than a Million stars by means of large spectroscopic surveys, complemented by information of the positions, motions and distances of stars provided by ESA’s astrometry satellite Gaia, which was launched in 2013. The combined data sets thus provide us with an integrated view on the chemical and kinematical history of the Galaxy and its various stellar populations. Combined with the results of cosmological gas dynamical simulations we thus can disentangle the various physical processes that have shaped the Galaxy's structure, get a detailed view of the complex structure of the Milky Way and its convoluted formation history, and, eventually derive interesting constraints on the underlying cosmological paradigm.

Speaker: Prof. Matthias Steinmetz (Leibniz-Institut für Astrophysik Potsdam (AIP))
• 11:15 11:30
Coffee break 15m
• 11:30 12:30
Plenary Talk II: Prof. Jürgen Rö​del Grand Ballroom ()

### Grand Ballroom

• 11:30
Physics and Politics in the Development of Lead-free Piezoceramics 1h

While the traditional materials of choice for piezoelectric devices over the past 60 years were lead-based perovskite ceramics, the environmental- and health-concerns, supported by governmental regulations, triggered the search for new lead-free alternatives [1]. This is embedded into a view of annual usage of lead as compared to other metals and the efforts to reduce lead in various commercial products in the last decades. During the past 10 years the research output rose from 10 to 400 publications per year with China and Japan leading, Europe accounting for 10 % of the total quantity and the US only showing very select activities.

In addition, a number of companies invested large sums into research and they aim at solid financial return. Some of them produced material reproducibly in 100 kg batches and select areas were identified, where lead-free piezoceramics have an advantage to lead-containing piezoceramics. As a result, the first products started to appear at the market place.

The aim of this contributions is to review the global situation and present scientific challenges and advancements, which have been made by introducing the three main competitors based on different chemistry and different salient phase diagrams. I will highlight achievements and remaining challenges in physics and will point to fruitful fields for the near future [2].

[1] Jürgen Rödel, Wook Jo, Klaus Seifert, Eva-Maria Anton, Torsten Granzow and Dragan Damjanovic, “Perspective on the Development of Lead-Free Piezoceramics”, J. Amer. Ceram. Soc., 92 [6] 1153-1177 (2009)

[2] J. Rödel, K.G. Webber, R. Dittmer, W. Jo, M. Kimura and D. Damjanovic, „Transferring lead-free piezoceramics into application”, J. Eur. Ceram. Soc., 35, 1659-81 (2015)

Speaker: Prof. Jürgen Rödel (Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, Darmstadt, Germany, 64287)
• 12:30 13:30
Lunch 1h Pupa, Thara & C-Salt ()

### Pupa, Thara & C-Salt

• 13:30 15:00
A1: Biological Ballroom 1 ()

### Ballroom 1

Conveners: Prof. Jirasak Wong-ekkabut (1.Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand 2.Computational Biomodelling Laboratory for Agricultural Science and Technology (CBLAST), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand) , Dr. Pongsakorn Jantaratana (Department of Physics, Faculty of Science, Kasetsart University) , Thana Sutthibutpong
• 13:30
Effects of Relaxation on Drag Force and Diffusivity of Highly Charged Spherical Particles in Cylindrical Pores 15m

Diffusion of macromolecules through nanopores of comparable sizes is affected by an interaction between the particle and the confining entities including both hydrodynamic and electrostatic interactions. The particle-pore hydrodynamic interaction causes an increase in the drag force exerted on the particle, resulting in the reduction of its diffusivity. If the particle is charged and submerged in an electrolytic solution, the particle motion creates a distortion of the electrical double layer, resulting in an excess retarding force added to the usual enhanced hydrodynamic drag. This is commonly known as the relaxation effect. In the present work, the excess force due to relaxation was evaluated from the finite element solution of the governing equations including Stokes equation, Poisson's equation and Nernst-Planck equations. The regular perturbation scheme involving the Peclet number was employed, considering the particle translocation as a perturbation on equilibrium state. The enhanced drag due to relaxation and the particle diffusivity are obtained for spherical particles confined in cylindrical pores where the particle and pore wall are of like charge and the electric potential of the system is high enough that the Poisson-Boltzmann could not be linearized. The obtained results are compared to effects of relaxation on drag force and diffusivity of macromolecules calculated by employing the perturbation involving the dimensionless surface charge density.

• 13:45
Blood type screening on polymeric strip test for clinical samples 15m

The point of care (POC) blood group typing has been developed for conveniently and immediately tests by polymeric strip test. Poly (methyl methacrylate (PMMA)) substrate was chosen and then designed the functional group layer to establish whether person is A, B, AB, or O blood type by naked eye. The substrate was modified by chemical bonding via carboxyl-methyl dextran to immobilize ABO antibody in the range of 2.5-60% v/v concentration. Clinical samples both red blood cell and EDTA blood were tested by our strip test and compared with a standard agglutination method. The result was found that there was consistent with standard method for all 80 samples. Red blood cell blood group typing is 100% precision detection and EDTA blood group typing is 97.5% precision for blood typing detection.

Speaker: Mr. Chanwit Kataphiniharn
• 14:00
Unpinning of spiral waves from regtangular obstacles by stimulated wave trains 15m

Pinning phenomena emerge in many dynamical systems. They are found to stabilize extreme conditions such as superconductivity and superfluidity. In cardiology, lengthened tachycardia correspond to propagating action potential in forms of spiral waves pinned to anatomical obstacles including veins and scares. Thus, elimination such waves is important particularly in medical treatments. We present study of unpinning of a spiral wave by a wave train initiated by multiple stimuli at a given location. The spiral wave is forced to leave the rectangular obstacle when the frequency of the wave train is higher than a threshold funpin. We found that funpin increases with the appearent length of obstacle,i.e., the projection of obstacle in the wave train direction. It implies that the orientation of the obstacle, with respect to the propagation of the wave train, plays an important role in the unpinning of the spiral wave

Speaker: Ms. Benjamas Ponboonjaroenchai (Kasetsart University)
• 14:15
Improvement of electrocardiogram by empirical wavelet transform. 15m

Electrocardiogram (ECG) is a crucial tool in the detection of cardiac arrhythmia. It is also often used in a routine physical exam, especially, for elderly people. This graphical representation of electrical activity of heart is obtained by a measurement of voltage at the skin so that the signal is always contaminated by noise from various sources. For a proper interpretation, the quality of the ECG should be improved by a noise reduction. In this article, we present a study of a noise filtration in the ECG by using an empirical wavelet transform (EWT). Unlike the traditional wavelet method, EWT is adaptive since the frequency spectrum of the ECG is taken into account in the construction of the wavelet basis. We show that the signal-to-noise ratio is increased after the noise filtration for the cases of different artifacts.

Speaker: Ms. Vikanda Chanchang (Kasetsart University)
• 14:30
Pesticide Detection Based on Ion Sensitive Field Effect Transistor 15m

Development of pesticide sensor based on the ion sensitive field effect transistor (ISFET) was investigated by using acetylcholinesterase which is an enzyme that catalyzes the hydrolysis of acetylcholine to acetate and choline. The ISFET can measure the inhibition reaction of acetylcholinesterase enzyme by the carbaryl pesticide through the pH changed in solution. The acetylcholinesterase was coated on ISFET’s surface by varying the enzyme concentration from 0.01 to 0.5 unit to select the optimum concentration for carbaryl detection. The pH effect of buffer solution was studied in the range of 6-10 to find the suitable pH for enzyme function which provides high sensitivity. The results showed that buffer solution pH 7 was the optimum pH for enzyme reaction and provided a good response for carbaryl detection in the range of 10$^{-6}$ to 10$^{-5}$ M. Moreover, the sensor stability was tested by comparison of the detection signal from ISFET that were kept at the different time.

Speaker: Mr. Supanat Sasipongpana (College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520 Thailand)
• 14:45
Electrical based harvesting of microalgae: Type electrodes 15m

We investigate the harvesting of microalgae, living in a culture fluid, by an application of constant electrical current via planar electrodes are made from different materials: aluminum, stainless steel, and graphite. All of these electrodes produce similar fine sub-millimeter bubbles which can levitate the microalgae to the top surface. Unlike graphite, metal sheets are cheap and convenient to handle but both of them are prone to erosion and cause metal contamination when used as positive electrodes. To minimize the metal contamination as well as the production cost, we combine the advantage of the different materials by using metal and graphite sheets as negative and positive electrodes, respectively. A usage of the combined electrodes in a large container to harvest Dunaliella Salina microalgae for beta-carotene production is demonstrated.

Speakers: Mr. Piyachat Wungmool (Kasetsart University) , Mr. Wu Zhe (Kasetsart University) , Mr. Nakorn Kumchaiseemak (Kasetsart University) , Ms. Sirinaree Supansomporn (Kasetsart University) , Mrs. Malee Sutthiopas (Kasetsart University) , Mr. Niran Jantawong (Kasetsart University)
• 13:30 15:00
A2: Phys Ed, Plasma, and Nuclear Fusion Ballroom 3 ()

### Ballroom 3

Conveners: Prof. Pornrat Wattanakasiwich , Prof. Teerasak Veerapaspong (Kasetsart University)
• 13:30
Design Steps for Physics Stem Education Learning Activity in Secondary Education 15m

This research aimed to provide solutions for secondary school teachers on physics who were incapable of designing decent stem education for their own learning activity contexts, and experts did not agree that it did not conform to the concept of STEM Education. It was, then, to develop steps on physics STEM Education learning system activity in secondary school education for further application.
Design steps were as follows 1. Study on research and other relevant literature reviews 2. Interview the 5 targeted instructors and experts on physics teaching and STEM Education 3. Design steps and have examination and assessment by experts for further improvement 4. Have 7 instructors design stem education learning following the steps and make teaching test on their own students.
During this moment, researcher teams were collecting data to analyze and effectively improve the design steps.
The result contributed to an emergence of 5 steps which are 1. Study on an origin, meaning, and objectives of STEM Education 2. Study and comprehend engineering design process 3. Study of STEM Education lesson features 4. Design STEM Education learning activity comprising of problematic situation prescription, objective setup, knowledge setup to allow learners to design solution methods that integrate scientific, mathematic, and technological knowledge, as well as prescription on feasible solutions based on engineering design principle and lesson plan design 5. Apply designed learning activity to teaching together with assessment and improvement.
The result of having physics teachers to design steps found that the teachers were able to design STEM Education learning activity certified by the experts that it conformed to the concept of stem education and would be more effective if they were under the guidance of engineering experts or the teachers had experience on invention or taught invention projects. Satisfaction assessment result of the teachers to design steps found that it was at “high” level . The results to the learners were that learning achievement, attitudes on physics, and critical thinking skill were significantly higher at .05 and the learners were satisfied to stem education learning activity at high level.
In addition, The results also found that the moment that the teachers did not understand and comprehend engineering design process and STEM Education objectives particularly its application objectives to Thailand was a major cause making the teachers unable to design STEM Education learning activity, One of the reasons causing problems of physics stem education teaching conduct in Thailand.

Speaker: Dr. Chalognchai Teevasuthornsakul (Faculty of Science and Arts, Burapha University Chanthaburi Campus)
• 13:45
Cambodian students’ prior knowledge of projectile motion 15m

Students always bring intuitive ideas about physics into classes, which can impact how they learn and how successful they are. To examine what Cambodian students think about projectile motion, we have developed seven open-ended questions and applied to grade 11 before (N=124) and after (N=131) conventional classes. Results revealed several consistent misconceptions, for instance, many students believed that the direction of a velocity vector of a projectile follows the trajectory at every position. They also thought the direction of an acceleration (or a force) follows the direction of motion. Two objects, which freely fall from the same height, spend different time to reach the floor because of different paths of motion. The greater angle of the launched projectile creates the greater horizontal range. The hand force imparted with the ball leads the ball goes straight to hit the target. The acceleration direction points from the higher position to lower position. These misconceptions will be used as primary resources to invent instructional instruments to promote Cambodian students’ understanding on projectile motion concepts in a following work.

Speaker: Ms. So Piten (Prince of Songkla University)
• 14:00
A Worksheet to Enhance Students’ Conceptual Understanding in Vector Components 15m

With and without physical context, we explored 59 undergraduate students’conceptual and procedural understanding of vector components using both open ended problems and multiple choice items designed based on research instruments used in physics education research. The results showed that a number of students produced errors and revealed alternative conceptions especially when asking to draw graphical form of vector components. It indicated that most of them did not develop a strong foundation of understanding in vector components and could not apply those concepts to such problems with physical context. Based on the findings, we designed a worksheet to enhance the students’ conceptual understanding in vector components. The worksheet is composed of three parts which help students to construct their own understanding of definition, graphical form, and magnitude of vector components. To validate the worksheet, focus group discussions of 3 and 10 graduate students (science in-service teachers) had been conducted. The modified worksheet was then distributed to 41 grade 9 students in a science class. The students spent approximately 50 minutes to complete the worksheet. They sketched and measured vectors and its components and compared with the trigonometry ratio to condense the concepts of vector components. After completing the worksheet, their conceptual model had been verified. 85% of them constructed the correct model of vector components.

Speaker: Umporn Wutchana (Ramkhamhaeng University)
• 14:15
A guided note taking strategy supports student learning in the large lecture classes 15m

In higher education, lecturing has been found as the most prevalent teaching format for large classes. Generally, this format tends not to give the effective learning outcomes. Therefore, to support student learning in the large lecture classes, we developed guided notes containing quotations, blank spaces, pictures, and problems. A guided note taking strategy was selected and has been used in our introductory physics courses for many years. In this study, we investigated the results of the implementation of the guided notes taking strategy to promote student learning on electrostatics. The samples were three groups of first-year students from two universities: 163 and 224 science students and 147 engineering students. All of them were enrolled the introductory physics course in the second semester. To assess students’ understanding, we administered the pre- and post-test to the students by using the electrostatics test. The questions were selected from the conceptual survey (CSEM) and some leading physics textbooks. The result of students’ understanding was analyzed by the average normalized gains. The normalized gain of each group was 0.61, 0.55, and 0.54 respectively. Furthermore, the students’ views on learning with the guided note taking strategy were explored by interviews. Most students perceived that the strategy helped support their learning engagement in the lectures.

Speaker: Dr. Jintawat Tanamatayarat (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut's University of Technology North Bangkok)
• 14:30
Assessing student understanding of measurement and uncertainty 15m

The objectives of this study were to develop and assess student understanding of measurement and uncertainty. A test has been adapted and translated from the Laboratory Data Analysis Instrument (LDAI) test, consists 20 questions focused on three topics including measures of central tendency, experimental errors and uncertainties, and fitting regression lines. The test were evaluated its content validity by three physics experts in teaching physics laboratory. In the pilot study, Thai LDAI was administered to 93 freshmen enrolled in a fundamental physics laboratory course. The final draft of the test was administered to three groups—55 freshmen taking fundamental physics laboratory, 20 sophomores taking intermediated physics laboratory and 18 juniors taking advanced physics laboratory at Chiang Mai University. As results, we found that the freshmen had difficulties in all topics. Most sophomores and juniors had problems with experimental errors and uncertainties and fitting regression lines. These results will be used to improve teaching and learning physics laboratory for physics students in the department.

Speaker: Mr. Sumit Jirungnimitsakul (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University)
• 14:45
Simulation of Gamma Rays Attenuation Through Matters Using the Monte Carlo Program GEANT4 15m

This research focuses on simulation of the radiation attenuation using a Monte Carlo program called GEANT4. In the simulation, properties and geometries of the shielding system, which are the thickness, shape and element of the shielding material, can be varied. The radiation in gamma rays regime is considered to be emitted from the isotropic radioactive sources that are Cs-137, Co-60 and I-131. The count rate of the gamma photons at specific energy is calculated to compare the ability of radiation attenuation for different shielding materials with variable thickness and shape. The study results show that the higher atomic number material can attenuate the radiation better than the material with lower atomic number. Moreover, the attenuation rate of gamma rays depends greatly on the thickness and shape of the shielding system. This is agree well to the theoretical suggestion. The results from Monte Carlo simulation using GEANT4 can be used to design the radiation shielding system for radioactive laboratories, particle accelerator institutes, radiotherapy area in hospitals, nuclear power plants, etc.

Speaker: Supasin Sukara
• 13:30 15:00
Physics Project Competition Ballroom 2 ()

### Ballroom 2

• 13:30 16:10
TNAM2017 (NARIT) Sync room ()

### Sync room

Meeting

• 15:00 15:10
Coffee break 10m
• 15:00 15:10
Coffee break 10m
• 15:00 15:10
Coffee break 10m
• 15:10 16:00
Poster Presentation I
• 15:10
Effect of Planar Electrode Shapes on Paramecium Cell Lysis Performance in Microfluidic Systems 15m

Electrical cell lysis is an important technique in obtaining intracellular components for further analysis. In this research, three different array of shapes; comb, triangle, rectangle; of indium tin oxide (ITO) were fabricated for cell lysis in microfluidic systems. Paramecium sp. cells were used in visualizing cell disruption due to the application of 12 V$_\text{p-p}$ AC voltage between electrodes. From the observation, Paramecium cell membrane disruptions were more pronounced in triangle and rectangle electrodes. Electric field distribution inside microfluidic systems for three electrode shapes were simulated to confirm Paramecium’s transmembrane potential. Simulation results agree with the experiments that triangle and rectangle shape produce high transmembrane potential when Paramecium cells are placed between electrodes.

Speaker: Ms. Chanikan Aroonnithi (Yupparaj Wittayalai School)
• 15:25
Characterization and XPS analysis of Mn-doped calcium copper titanate thin films by a sol-gel method. 15m

Perovskite Mn-doped CaCu$_3$Ti$_4$O$_{12}$ (CCTO) thin films were prepared by a sol-gel spinning method. The films were deposited one layer at a time and each layer was annealed at 800 $^o$C for an hour. Mn doping concentration in the films was varied in the range of 0-4 wt%. As the Mn doping concentration increases, the crystallite size decreases along with decreasing in the measured FWHM of X-ray peaks. From the FESEM micrographs, the grain size decreased to 20-30 nm with the increase of Mn content to 4 wt%. The high resolution XPS spectrum of Mn 2p of 4 wt% Mn-doped CCTO film show the existence of two different Mn ions, Mn$^{3+}$ and Mn$^{4+}$. The Ca 2p regions in the XPS spectrum suggested that there are two environments for Ca atoms in the film structure. On the other hand, the XPS spectra of Ti 2p and Cu 2p regions show only the existence of Ti$^{4+}$ and Cu$^{2+}$, respectively.

Speaker: Mr. Pachara Jolutsakul (Department of Physics, Faculty of Science, Chulalongkorn University 254 Phyathai Road, Patumwan, Bangkok Thailand. 10330)
• 15:40
surface water wave reconstruction using MATLAB 15m

Measuring surface water wave properties such as amplitude and wavelength can be difficult when the wave amplitude is very small. The digital image correlation (DIC) MATLAB program makes it possible to analyze such surface wave properties. The technique relies on analyzing of pattern displacement images due to surface perturbation of random patterns at the bottom of the water container. This method can be used to recreate surface wave either in snapshot or in motion, in which the wave’s amplitude the wavelength information can be extracted from. This method can also be used in determining surface tension of other transparent liquid media.

Speakers: Mr. Nirut Pussadee (Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University) , Mr. Sitthipong Yapo (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University)
• 15:45
A facile method for Electrospinning of Chitosan/PVA /Siam weeds Nano fibers 15m

This research studied the optimal conditions for crafting fiber of PVA / CS / SW by electrospinning techniques. The study was divided into two parts. first, This crafting fibers PVA/CS by spinning PVA/CS ratios of 50/50, 60/40, 70/30, 80/20 and 90/10 at constant feed rate 0.3 ml/h, 10 cm and 15 cm spinning distance at 7 and 8 kV voltage respectively. Part Two, This crafting fibers PVA/CS/SW by spinning PVA/CS ratios of 48:48:4, 58/39/3, 69/29/2, 77/20/3 and 88/10/2 at constant feed rate 0.3 ml/h, 10 cm and 15 cm spinning distance at 6.5-8.5 kV voltage. Then, for analyzed their microstructure by scanning microscope (SEM). The chemical structure analyzed by Fourier transform infrared spectrometer (FT-IR).
The results showed that the Optimum conditions for artificial fiber, PVA/CS can be synthetic fibers are best ratios at 50/50 feed rate of 0.3 ml/h 10 cm spinning distance at 7 kV voltage. When adding Siam weed extract edges into synthetic fibers can be best ratio at 58/39/3 (PVA/CS/SW) feed rate of 0.3 ml/h 15 cm spinning distance at 7.5 kV voltage. The smallest fiber diameter 198 ± 51 nm. And, Results from FTIR confirmed that fiber consists of polyvinyl alcohol blend with chitosan and Siam weed their combinations do not interact. Or a new substance. the nanofibers was measured and the antibacterial behavior of the nanofibers against Escherichia coli was studied by bacterial growth inhibition halos and bactericidal kinetic testing. The chitosan/PVA/Siam weeds nanofibers possessed certain antibacterial.

Speaker: Mr. piriya praneekit
• 15:45
A Nonlinear Transfer Matrix Method for Third-Harmonic Generation Modeling in a One-Dimensional Metal-Dielectric Photonic Band-Gap Structure 15m

In this work, a nonlinear transfer matrix method, which is simple, fast, and, accurate numerical method for nonlinear optical phenomenon modeling, has been used to develop a theoretical model of a third-harmonic generation with nondepleted pump in one-dimensional metal-dielectric photonic band-gap structures for oblique incidence. The advantage of this formalism is considering multi-reflections and interferences between all forward and backward direction components of fundamental and third-harmonic waves. The fundamental and third-harmonic field intensities, which distribute along the sample structures, have been calculated for both TE and TM modes. And conversion efficiencies have been also calculated as a function of the thicknesses of metal and dielectric layers, and incident angles of fundamental wave. With optimal incident angle and layer thicknesses, the greatest conversion efficiency of third-harmonic generation can be achieved. In addition, the plasmonic enhancement of third-harmonic generation, which is occurred because of field localization between metal-dielectric interfeces, has been examined with the proposed formalism.

Speaker: Surawut Wicharn
• 15:45
A novel spectrometer based on the near-field Talbot effect 15m

By making use of advanced technique of the near-field Talbot effect, we design a novel spectrometer. Our method provides a compact and portable spectrometer according to the characteristic of the Talbot effect. Here, we propose the idea with the simulations done with reasonable values. With vibration and temperature adjustments, the high resolution over a range of a few nanometers can be obtained.

Speaker: Mr. Withun Sutham (Department of Physics, Faculty of Science, Burapha University, ChonBuri Province, 20131, Thailand)
• 15:45
A Study of Ferrofluid Shape Formation under Influence of Magnetic Field from Various Permanent Magnet Shapes 15m

When ferrofluid is in a presence of external magnetic field, different peak patterns are formed depending upon shape and magnetic field strength of permanent magnets. In this study, 2 dimensional magnetic field distribution from different magnet shapes were mapped and compared with the simulated magnetic field distribution in order to use magnetic field strength at particular location to calculate magnetic force exerting on ferrofluid. Balance between ferrofluid surface tension and magnetic force on ferrofluid leads to a good approximation of peak pattern distribution of ferrofluid.

Speakers: Mr. Tananut Sanghong (Chiang Mai University Demonstration School) , Mr. Tanabodee Kaewwichian (Chiang Mai University Demonstration School)
• 15:45
Adsorption study of gas molecules on ZnO decorated carbon nanotubes 15m

Carbon nanotubes (CNTs) and zinc oxide (ZnO) are one of the most popular materials for gas sensing applications due to its their high electron transfer rate, large specific surface area, promising electronic and structure properties. However, gas sensor based on ZnO nanocluster decorated CNTs is still limited. In this work, we have simulated the models the formation of ZnO nanocluster decorated CNTs and investigated the theoretical study of adsorption of gas molecules (such as methanol, ethanol and isopropanol ) on ZnO nanocluster decorated CNTs gas sensor for the first time by using self-consistent charge density functional tight-binding (SCC-DFTB) method. To find the most favorable adsorption configuration, gas molecules were placed at various distances (d) above ZnO surface decorated CNTs. Its interaction energy (𝜟E) is calculated by the following equation:
𝜟E=E(gas molecules+ZnO-CNTs)-E(ZnO-CNTs)-E(gas molecules), where E(gas molecules+ZnO-CNTs), E(ZnO-CNTs)and E(gas molecules) are the total energies of gas molecules+ZnO-CNTs, ZnO-CNTs and gas molecules systems, respectively. The highest interaction of methanol-ZnO decorated CNTs is found to be -13.28 eV at the distance of 2.60 Å while those of isopropanol-ZnO decorated CNTs and ethanol-ZnO decorated CNTs are -12.75 eV and -12.72 eV at the distance of ~2.40 Å and ~2.60 Å, respectively. It can suggest that the ZnO decorated CNTs sensor owns high selectivity to methanol comparising with isopropanol and ethanol. The electronic structures of the ZnO nanocluster decorated CNTs gas sensor before and after gas adsorption will be discussed in more details. The sensing mechanism related to methanol detection will be highlighted.

Keyword: CNTs sensor, ZnO sensor, SCC-DFTB method, ZnO decorated CNT, Gas Sensor, Methanol Sensor

Speaker: Mr. Yotsarayuth Seekaew (Department of Physics, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand)
• 15:45
Application of atmospheric-pressure argon plasma jet for bread mold decontamination 15m

Atmospheric-pressure plasma (APAP) is a promising non-thermal technology for microbial control and prevention minimally affecting quality of foods. Effect of APAP jet on the growth of bread molds, including Aspergillus sp., Rhizopus sp., and Penicillium sp., isolated from white bread were investigated. The molds were isolated, verified, cultured to fully grown on potato dextrose agar (PDA), and subsequently treated with APAP jet using plasma generating power at 24 W for 5, 10, and 20 min, respectively. The inhibition of mold growth was investigated by comparing fungal dry weights and the effect on fungal cell structure was observed using compound light microscope. The results indicated that the 20-min treatment time is most effective in retarding the growth of the three bread molds. However, this level of generating power did not lead to destruction of the cellular structures for all the three fungi. Plasma generating power and treatment time are significant parameters determining the success of bread mold decontamination and further investigation on real bread matrix is needed.

Speaker: Dr. Panakamon Thonglor
• 15:45
Application of Silver Nanoparticles for Natural Rubber Latex 15m

Antibacterial activity of silver nanoparticles (AgNPs) has been attracted many interests in several applications such as food packaging, medical devices, wastewater treatment and textile fabrics. In this work, antifungal activity of AgNPs for natural rubber latex has been investigated. A technique of green AgNPs synthesis route has been presented based on aqueous silver nitrate (AgNO$_3$) and Pistiastratiotes L. extracts acted as reducing agent. The antifungal activities of the AgNPs against Fusarium oxysporum, Geotrichum sp., Aspergillus oryzae, Rhizopus oligosporus, Penicillum sp. and Trichoderma sp. (fungi in natural rubber latex) were analyzed by disc diffusion method. The synthesized AgNPs were characterized by a UV/Visible spectroscopy (UV-Vis) and Transmission Electron Microscopy (TEM). The results exhibited the surface plasmon resonance at 395 nm. The average diameter of synthesized AgNPs was about 14-20 nm and spherical in shape. The synthesized AgNPs exhibited activity against fungi.

Speaker: Ms. Pranlekha Traiwatcharanon (Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand)
• 15:45
Application of tapered glass capillary microbeam in MeV-PIXE mapping of longan leaf for elemental concentration distribution analysis 15m

The aim of this study was to understand elemental concentration distribution in local longan leaves for revealing whether and how the plant was affected by the environment or agricultural operation since longan trees were normally heavily sprayed with fertilizer and pesticide and chemical residues might be long lasted on the leaves. The analysis was carried out using the MeV-microbeam particle induced X-ray emission (PIXE) mapping technique which was achieved by a home-developed tapered glass capillary microbeam system based on the 1.7-MV tandem accelerator and its ion beam analysis beam line at Chiang Mai University. The microbeam was coming from the capillary with a 100-µm-diameter exit and the ion beam was of 2-MeV proton. This study was interested in difference in the elemental concentration and distribution between the leaf midrib and lamina areas. In the measurement, the micro proton beam after the tapered glass capillary analyzed the leaf sample at a fixed spot of about 150 µm in diameter for 1000 seconds, while the leaf held on the sample stage was translated step by step over a 1,350-µm range across the leaf midrib edge to the leaf lamina area, resulting in total 9 data requisition spots to realize a scanning of the interesting area. The resulting data were colored to form a map of the elemental concentration distribution. Analysis from the map revealed 7 dominant elements, which were Al, S, Cl, K, Ca, Sc and Fe. It was interestingly found that in the midrib region, Al, S, Cl, K, Ca, Sc were relatively higher in concentration than in the lamina area, while the Fe concentration was in an opposite trend to that of the others. The only indication of fertilizer and pesticide elements detected in the leaf sample was of K.

Speakers: Liangdeng Yu (Thailand Center of Excellence in Physics) , Dr. Nirut Pussadee (Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thiland ) , Mr. Sirawut Natyanun (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand)
• 15:45
Biocompatibility of TiO2, TiN and TiNO Thin Films Deposited by DC Reactive Magnetron Sputtering 15m

Titanium dioxide (TiO2), Titanium nitride (TiN) and Titanium oxynitride (TiNO) are considered as promising material for the medical biology applications. In this study, The properties of biocompatibility on TiO2, TiN and TiNO thin film deposited by dc reactive magnetron sputtering on glass substrate were investigated. The material characterized techniques such as x-ray diffraction (XRD), atomic-force microscopy (AFM), contact angle measurement were used to analyze crystal structure, surface morphology and wettability, respectively. The standard toxicity test method (Assay based on cell cultures) was employed on the various films and observed the number of cell on the film surface by scanning electron microscopy (SEM). It’s was found from the XRD spectra that TiO2 thin film shows the amorphous structure, whereas the TiN and TiNO thin films exhibit the polycrystalline structure. The surface roughness (Ra) of the films obtained by AFM is in the range of 1.77 - 4.17 nm that Ra increase from TiNO, TiO2 to TiN thin film. The contact angle of the films is between 20.37 - 61.60° and decreases from TiO2, TiNO to TiN. The various films are non-toxicity on the tissue cells. But TiNO spread cell is mainly shows on TiNO indicating the ratio of reactive gas affects the biological response of cells.

Speaker: Ms. jita vachabuskorn
• 15:45
Characteristic of sputtered Co75Ag25 film on various under-layer and polyimide substrate 15m

The Co75Ag25 films were deposited on Co, Ni, Cr and Al under-layers and polyimide substrate by RF-sputtering. All of films exhibited soft perpendicular anisotropy with HCP-Co (201), (220) and FCC-Ag (111), (200) structures. The Co75Ag25 film on Co under-layer showed regular grain distribution and maximum grain size of about 32.2 nm whereas the film on Ni under-layer showed minimum grain size and surface roughness of about 9.8 and 1.3 nm, respectively. The film deposited on Cr under-layer showed maximum perpendicular coercivity and highest squareness ratio about 181 G and 0.112, respectively while the film on Co under-layer showed maximum saturation and remanent magnetization in both of parallel and perpendicular measurement. All results implied that magnetic properties and surface roughness and morphology of sputtered Co75Ag25 film are dependent on under-layer material.

Speaker: Nittaya Sanganan
• 15:45
Characterization of Ag doped WO3 synthesized by electrospinning 15m

SEM technique was assisted to selected the best condition of 5 wt% Ag doped WO3 nanofiber which synthesized by electrospinning method and calcined at 550 ๐C for 2 hours then were investigated the characteristic via X-ray diffraction, Raman spectroscopy, photoluminescence, UV-visible, FTIR and TEM technique. The results show that is product of orthorhombic Ag-WO3 nanofiber with 60 nm diameter and 2.53 eV photon energy gap semiconductor.

Speaker: Mr. Jananan Kamsri (Author)
• 15:45
Charge Mobility of Organic Solar Cells using Low Cost Pulsed Laser for photo-CELIV 15m

Charges mobility is the key factor to determine the performance of bulk heterojunction organic solar cells. Many relevance approaches have been utilized to investigated the charges mobility. Charge extraction by linearly increasing voltage (CELIV) is one of the famous technique. However, the excitation light source is limited to the commercial short pulse laser or LED which is rather high cost. Herein, the simple <100 ns pulse generator circuit to drive the cheap laser diode have been developed and used as the light source in photo-CELIV. The set-up has been performed with the standard bulk heterojunction organic solar cells. Then the charges mobility of such device is carried out and compared with the literature.

Speaker: Mr. Sorawit Changsalak
• 15:45
Charge Mobility of Organic Solar Cells using Low Cost Pulsed Laser for photo-CELIV 15m

Charge Mobility of Organic Solar Cells using Low Cost Pulsed Laser for photo-CELIV

Sorawit Changsalak1, Wachirawit Srisa-nga1, and Yingyot Infahsaeng1*
1Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang, Pathum-Thani, Thailand

*E-mail: yingyot.infahsaeng@gmail.com

Abstract
Charges mobility is the key factor to determine the performance of bulk heterojunction organic solar cells. Many relevance approaches have been utilized to investigated the charges mobility. Charge extraction by linearly increasing voltage (CELIV) is one of the famous technique. However, the excitation light source is limited to the commercial short pulse laser or LED which is rather high cost. Herein, the simple <100 ns pulse generator circuit to drive the cheap laser diode have been developed and used as the light source in photo-CELIV. The set-up has been performed with the standard bulk heterojunction organic solar cells. Then the charges mobility of such device is carried out and compared with the literature.

Keywords: photo-CELIV, charge mobility, organic solar cells, short pulse circuit

Speaker: Mr. Sorawit Changsalak
• 15:45
Cholesterol Effect on Physical Properties of Niosome Bilayers: A Molecular Dynamics Study 15m

Molecular dynamics simulations were employed to investigate the cholesterol concentration effect on the physical properties of niosome bilayers such as area per molecule, membrane thickness, hydration structure, fluidity and diffusion coefficient. All simulations were carried out at a constant temperature of 300 K by using Gromacs package 5.1.2. We found that increase in cholesterol numbers to form niosome bilayers results increase in area per molecule and compressibility, but decrease in the membrane thickness. These results suggest that the cholesterol concentrations cause significant change in the phase formation of niosome bilayers.

Keywords: Niosome Bilayer, Molecular Dynamics, Cholesterol Concentration, Membrane Thickness, Diffusion

Speaker: Mr. Likit Temprom
• 15:45
Classical Nuclear Simulations of the $\pi^{+}({^3}He,ppn)\pi^{+}$ Reactions with Quantum Corrections 15m

We investigated quantum corrections to classical nuclear simulations of the $\pi^{+}({^3}He,ppn)\pi^{+}$ reactions.These simulations are often used to describe nuclear reactions which lead to many final states.The ratio of the quantum multiple scattering to the classical cross section for the same process is used as a correction to the classical model calculation.The single,double,triple and all scatterings for the scattering protons of different angles are presented.

Speaker: Dr. Rachen Ratanarojanakul
• 15:45
Conceptual Study of Possibility for Droplets to Achieve Superheated in Edge Tokamak Plasmas 15m

Molten droplets are probably generated in a fusion tokamak through splashing of molten layers of plasma-facing surfaces, during transient events such as disruptions and edge localized modes (ELMs) at which surface melting is unavoidable, and melting of solid wall-material debris, i.e. dust/flakes, by heat flux of an energetic fusion plasma. Molten droplets are allowed if plasma-facing materials are made of metals except carbon (C). As ITER is now planning to use tungsten (W) for its divertor and beryllium (Be) for its main wall, dust and droplets should mostly consist of both wall materials. As mentioned that a fusion plasma is so energetic, it is possible to have droplets staying in the plasma long enough before a fusion operation terminates. The assumption is strengthen by the existences of many spherical dust, caused by surface tension of liquid phase. This suggests that to study metallic dust transport, some phenomena occurring especially in liquid phase should be focused on. By adapting the derivation of floating potential determination, such as Orbital Motion Limited (OML) theory, we are permitted to determine ion and electron momentum fluxes. This results in actual pressures on dust and droplet in a plasma. Moreover, net pressure on a droplet does matter because it determines boiling temperature of the droplet materials. This should influence on behaviors of dust/droplet transport in tokamaks. We conduct this preliminary study to consider whether or not superheating by depressurization can be achieved on a droplet in a fusion plasma. We believe superheating should occur if a droplet encounters steep number density and temperature profiles in tokamaks, i.e. edge transport barrier in H-mode. If such steep plasma profiles allow droplet superheating, this should suggest further effects, for example localized impurity deposition by electrostatically-enhanced vapor explosion, superheating rocket force for abnormal high speed droplet etc., which should be never found for non-liquid C dust.

Keywords: misty plasma, plasma-surface interactions, dust, tokamak, Orbital Motion Limited (OML), Edge Localized Modes (ELMs), disruption, superheating.

Speakers: Dr. Nopparit Somboonkittichai (Department of Physics, Faculty of Science, Kasetsart University) , Dr. Michael Coppins (Blackett Laboratory, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom)
• 15:45
Construction of 3D Image of Surface Coated with Micro-Scale Transparent Layer by Analyzing Speckle Interferogram with Fast Fourier Transform 15m

Light interferometry is one of great non-destructive tools for making a surface profile image of materials. Because of phase difference analyzing method as a Fast Fourier transform (FFT), 3D surface profile image can be constructed from a speckle interferogram of He-Ne laser.[ref] However, 3D image of a surface coated with micro-scale transparent layer cannot be structure by using He-Ne laser as a light source of Michelson Interferometer (MI). In this research, 3D image of groove surface of standard gauge block, coated with transparent layer, is constructed by using FFT for analyzing the speckle image taking form MI with a low coherence light source as Superluminesent diode (SLD). The constructed surface image of the coated surface well agrees with the one of uncoated surface built from the same method. It also agrees with the one of uncoated surface analyzing the interferogram of He-Ne laser as a light source of MI by using FFT, as well.

Speaker: Mr. Parinya Duangklang (Chulalongkron University)
• 15:45
Control the Crystal Growth of Al-doped ZnO Thin Film Prepared by Pulsed Laser Deposition and The Influences on Its Optical and Electrical Properties 15m

Transparent conducting thin film is an important layer determining the efficiency of optoelectronic devices. Materials shown the wide-range transparency together with high conductivity are of interest. Among materials providing such optical and electrical properties, metal-doped ZnO is a promising material that gain tremendous attractions. In this work, highly transparent and highly conductive thin films of Al-doped ZnO (AZO) are achieved by pulsed laser deposition (PLD). By changing the substrate temperature in the range of room temperature to 500 $^\text{o}$C during the deposition process, the preferential growth direction of AZO crystal is controlled and, as a consequence, the surface morphology, optical and electrical properties of AZO thin film are able to be manipulated. X-ray diffractrograms as a function of substrate temperature clearly illustrate the ability to control the preferential growth direction of AZO. At the low substrate temperature, the growth along [002] direction corresponding to c-axis of hexagonal ZnO is only observed. By elevating substrate temperature, not only crystallinity of AZO thin film is further improved but also the competition of crystal growth along the [002], [001] and [101] directions are occurred due to the increase of total energy and surface mobility of adatom. The AZO films obtained by all preparation conditions exhibit an n-type semiconducting characteristics, furthermore, the carrier concentration and the carrier mobility of AZO thin films can be optimized to reach 4.10×10$^\text{20}$ cm$^\text{-3}$ and 7.53 cm$^\text{2}$/Vs, respectively. The excellences in both carrier concentration and mobility of AZO thin film lead to very low resistivity of 2.08×10$^\text{-3}$ $\Omega$ cm. In addition, the wide optical band gap of ~3.50 eV together with the high transparency over 85% is obtained from the AZO thin films. The exceptional optical and electrical properties of AZO thin film demonstrate that such material has enough potential to become a promising candidate using in optoelectronic applications.

Speaker: Mr. Narathon Khemasiri (College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladkrabang)
• 15:45
Dead and living yeast cells analyzer using electrical force induction 15m

The present project had been a collaborative project fully supported from Singha Beverage Company to invent the novel equipment that could both determine dead and living cells with the rapid real-time analysis for on-site operation and most importantly offer the prospect of effective separation of dead vs. live cells. We employed the principle of cell polarizations in AC non-uniform electric fields with the exact theoretical calculation of the lower critical frequency (LCF) analyzed using the RC model for a spheroid to separate dead and living yeast cells. The successful identification and separation of live vs. dead cells was achieved by a combination of a sequential signal generator (SSG) (to be patented) equipped with a tablet touch screen computer interface for prompt commands. Dead and living yeast cells were completely separated by tuning electric field frequencies at the unique value (concealed). Percentages of both dead and living cells were analyzed throughout the image processing protocol.

Speaker: Prof. Sakshin Bunthawin (Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Phuket 83120, Thailand)
• 15:45
Dependence of contact angle on deposition time for superhydrophobic carbon nanoparticles films 15m

We investigated superhydrophobic carbon nanoparticles (CNP) films coating on glass slides. The films were deposited by candle soot layers from combustion flames. Contact angle for water droplets increase dramatically from 44.8±4.7˚ for clean glass slides to 157.6±6.6˚ when the glass slides coated by CNP films for 10 seconds. The contact angle of water droplets on CNP samples decreases with films deposition time. It tends to approach the constant angle of ~150˚ after coating for 300 seconds. To examine the coating CNP films on non-flat surfaces, two types of samples, carbon nanotubes (CNT) and graphite flakes (GF) covered glass slides, were prepared for coating with CNP films. Contact angles of CNT and GF coated samples are 80.1±12.6˚ and 134.7±4.8˚, respectively. After coating CNP films for 10 seconds, they increase to 135.7±7.4˚ and 135.8±12.8˚. Also, longer deposition time causes the decrease of contact angle with deposition time, resembling to the CNP film samples. Particle size and film thickness of CNP films were measured by scanning electron microscopy. We suggested that increasing multiple scale roughness of CNP films could lead to larger contact area between droplets and CNP films, resulting in decrease of contact angles.

Speaker: Dr. Sumet Sakulsermsuk (Chiang Mai Univerisity)
• 15:45
Design and performance of a laser-based weed control system 15m

Design and performance of a laser-based weed control system
Sirinun Sirikunkiti and Amarin Ratanavis
Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Center (LANDOS), Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Thailand

This paper investigates the influence of CO2 laser as a non-contact tool for weed control application. The study aims specifically to the unfocused beam treatment for distant targets. The optical design was evaluated by an optical design software. The spatial profile of the laser beam was analyzed. The characteristics of the laser beams at targeted distance were explored. Based on the optical setup, the optimal expanding of the laser beam was archived. The relation between irradiation times and spot sizes was examined. These results demonstrate the potential of CO2 laser as promising alternative for an efficient weed control.

Keywords: Lasers, Weed control, Physical optics propagation

Speaker: Mr. Sirinun Sirikunkitti
• 15:45
DEVELOPING CONCEPT ON ENERGY CONSERVATION USING SIMPLE EXPERIMENTS FOR GRADE 10 STUDENTS 15m

The purpose of this research was to develop concept and retention rate on energy conservation. The activities included simple and easy experiments. This experiments looks at energy transformation from potential to kinetic energy. The samples were 30 students which were purposively selected from grade 10 in the second semester of the 2016 academic year. The research tools consisted of learning lesson plans, learning achievement test. The results showed that the experiment set worked perfectly and can be used for learning activities. The students’ achievement score was significantly increased at statistical level of .05 and the students’ retention rate was in a high level and learning behavior was in the good level. This simple experiments was an opportunity for students to learn to demonstrate to their future friends and experience encouraged the students to use their familiar models to explain phenomena in the daily life.

Speakers: Mr. Sakchai Rachniyom (Faculty of Science, Ubonratchathani University) , Dr. Sura Wuttiprom (Faculty of Science, Ubonratchathani University)
• 15:45
Developing dye sensitizied solar cells with natural dyes and polymer electrolytes 15m

We have fabricated dye sensitized solar cells and improved the efficiency of the cells by doping aluminum (Al) in anodization process during synthesizing TiO2 nanotubes (Titania nanotubes). We have studied the microstructure of titania by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Atomic Force Microscopy (AFM), optical property by UV-visible spectroscopy, and the effect of Al-doping on the efficiency of the solar cells. We also present the polymer electrolytes on the efficiency of the cells by comparing 2 polymers: the polyacrylonitrile-co-styrene and polyethylene oxide.

keyword: dye sensitized solar cells; polymer electrolytes;Titania nanotubes

Speaker: Wachira Seesad (Department of Physics, Faculty of Science, Ubon Ratchathani University)
• 15:45
Developing students’ learning achievement and experimental skills on buoyancy and the involvement of Newton’s third law through experimental set 15m

The purposes of this research were: to construct packages of operations on buoyancy and the involvement of Newton’s third law, to enhance achievement score of students on buoyancy and the involvement of Newton’s third law , to enhance experimental skills on buoyancy and the involvement of Newton’s third law and to evaluate students’ attitude towards the packages of operations on buoyancy and the involvement of Newton’s third law using inquiry method. The samples were 42 Mattayomasuksa V students in academic year 2016 at Hatyaiwittayalai School, Hatyai, Songkla. The research method was one group pretest-posttest design. The research tools consisted of experimental set on buoyancy and the involvement of Newton’s third law, the learning achievement test on buoyancy and the involvement of Newton’s third law and the students’ attitude questionnaires. The experimental skills of most students was in a good level . The satisfaction of most students was in a good level. The research showed the learning achievement after instruction higher than that before instruction using experimental set at the significant level of .05 and the class average normalized gain is in the medium gain

Speakers: Mr. Chokchai Jaewijarn (Ubonratchathani University) , Dr. Sura Wuttiprom (Ubonratchathani University)
• 15:45
Development of Dielectric Barrier Discharge for Reducing Microbial Contamination in Pepper (Piper nigrum) and Sesame (Sesamum indicum Linn.) Powder 15m

This research is designed to determine the efficacy of DBD plasma to reduce the microbial contamination of pepper and sesame powder. The AC high voltage power supply was used with voltage up to ±20 kV and the frequency of 5.5 kHz is applied to DBD. The gap of DBD electrodes was set at 5 mm. In raw initial samples, The total aerobic count of pepper (Piper nigrum) was found at quite high level of 5.40 x105 CFU/g. Coliform bacteria were also found both in sesame (Sesamum indicum Linn.) powder and pepper. Both kinds of samples were treated with plasma for 2, 4, 6 and 10 minutes. Results indicated that plasma treatment at 2-10 minutes reduced the total aerobic count of pepper allowed to achieve the acceptable microbial level for spices. The plasma treatment times in this experiment were effective in reduced coliform bacteria both in pepper and sesame powder (MPN/g <3). Plasma from dielectric barrier charge can reduce Staphylococcus epidermidis in sesame which was artificially contaminated with 3.50 x 102 CFU/g resulting in 0.15-0.5 log cycle reduction of microbial load.

Speaker: Jiraporn Promping
• 15:45
Development of Neutron Imaging System for Neutron Tomography at Thai Research Reactor TRR-1/M1 15m

The neutron imaging is a powerful non-destructive technique to investigate the internal structure and provides the information which is different from the conventional X-ray/Gamma radiography. By reconstruction of the obtained 2-dimentional images from the taken different angle around the specimen, the tomographic image can be obtained and it can provide the information in more detail. The neutron imaging system at Thai Research Reactor TRR-1/M1 of Thailand Institute of Nuclear Technology (Public Organization) has been developed to conduct the neutron tomography since 2014. The primary goal of this work is to serve the investigation of archeological samples, however, this technique can also be applied to various fields, such as investigation of industrial specimen and others. The conventional technology of neutron image recorder has been replaced by a digital camera coupled with a fluorescence screen to get a higher performance and provide more convenience. The shielding wall of neutron imaging room has been renovated and a neutron shutter has been renewed for physical and radiation safety purposes. Moreover, the new rotation stage has been designed to support the specimen turning for this system.
This research paper presents the performance study of a high-efficiency and high-resolution neutron camera manufactured by Neutron Optics and shows the obtained tomographic images. Furthermore, the updated status of the neutron imaging room renovation is described.

Speaker: Dr. Sarinrat Wonglee (Thailand Institute of Nuclear Technology (Public Organization))
• 15:45
Development of the teaching sound frequency with Sing Sharp mobile phone and pipe pressure for KARAOKE subject 15m

In practice pronunciation, volume and frequency in the course of karaoke. Student in classroom training in class hour cannot be trained to look for suitable projects. The project looks to fit the mouth to get the frequency and volume of demand at home because there is no volume and frequency of the sound to the uninitiated.
Sing sharp leach program is able to tell the minister that the volume and frequency of the vocal was able to study the structure of the mouth, voice characteristics required.
In this research, teaching various aspects of oral utterance garage. The volume and different frequencies. The working class has to be able to learn at home.
In the test, the student has to study the various aspects mouth to mouth, frequency and volume, "OU" voiced.
To maintain the level of articulation The results of training Found that 122 people have voiced the threshold to 90 percent

Speaker: Mr. thienchai ounsumran
• 15:45
Development of X-ray fluorescence technique for tin oxide analysis 15m

The purpose of this work was to develop technical analysis of X-ray fluorescence (XRF) and compare with technical neutron activation analysis (NAA). In this study, three samples of tin oxide (SnO) were used to be the reference materials. The results from NAA show the content of tin were 79.39, 77.48 and 73.35 wt%. While the XRF analysis in unnormalized mode show the content of tin were 68.77, 67.42 and 61.60 wt% and normalized mode were 72.44, 77.95 and 68.71wt%, respectively. The SnO were mixed with borax that use as a binder. The borax contents were varied from 30 to 70 wt%. The XRF in normalized mode result show the sample that mixed with borax 70 wt% has the highest accuracy of tin were 75.71, 74.61 and 71.01wt%. Our study demonstrated that improved using XRF technique in normalized mode and mixed with borax 70wt% to analyses the content of tin use instead NAA technique. From the experiment could be apply to determine the concentration of tin in various industry.

Speaker: Chalongwut Boonpratum (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand)
• 15:45
Diamond-like carbon films prepared by RF magnetron sputtering 15m

Diamond-like carbon thin films were prepared by RF magnetron sputtering. Different deposition conditions were experimented. The main variable parameters were the argon flow rate, RF power and bias voltage. The carbon films were characterized by photoemission spectroscopy and soft X-ray absorption spectroscopy. In this report, the results from the measurements will be reported and discussed.

Speakers: Ms. Jidapa lomon (Suranaree University of Technology) , Ms. Ponthip Chaiyabin (Suranaree University of Technology)
• 15:45
DIY Low Cost Thick Lenses kit Applied Teaching of Parallel light rays passing through lenses in either direction in Physics 15m

The Thick lenses was developed and fabricated by DIY (Do it yourself) Low Cost process that applied teaching the focal length for parallel light rays passing through lenses in either direction in Physics, to increase good achievement and attitude of students. This instrument kit was made form transparent acrylic Perspex thickness of 2 mm. It was cut rectangle form an area the size 2x15 cm2 and bent by heat air blower. Next, two plastic bend which have two spherical surfaces with radii of curvature R1 and R2 of about 3-4.5 cm were composed to be the thick lenses form base on acrylic platform. Next, liquids such as Ice (H2O), water, oil, glycerin and gasoline that have the liquids index of refraction (n) 1.31, 1.33, 1.40, 1.47 and 1.50, respectively, were poured into thin lenses form of acrylic form. The 36 students in grade 10 at Mengraimaharaj Witthayakhom School, Chiang Rai, Thailand, were tested by this instrument. The 5Eenter code heres model of teaching and the one group pretest-posttest design were used to study of education through learning activities. To determine the effectiveness of instrument and learning achievement of students were evaluated by the satisfaction analysis. While the attitude of the students was interpreted by the observation and recording of results from other activities. In this research, it was found that the instrument kit using of 5Es model with this instrument has very useful. The students can be easy understood about the light rays passing through lenses in either direction. The results have shown that the 83.33 percent of students were satisfied to learn. Meanwhile, the enhancing of learning achievement in grade 10 students are 80.92/78.61 percent and the sample was found that the attitude of students increase.

Speaker: Dr. Meechai Thepnurat (Chiang Rai Rajabhat University)
• 15:45
Effecst of Dielectric Barrier Discharge Plasmas Treatment on Egg Shell 15m

Dielectric Barriers Discharge (DBD) plasmas is a cold plasma that can be generated in atmospheric pressure, thus allows it to be used on various applications. In this work, DBD plasmas will be used for treating egg shell. The results in terms of surface modification will be presented.

Speaker: Dr. Nopporn Poolyarat (Physics department,Faculty of Science and Technology, Thammasat University)
• 15:45
Effect of annealing conditions on polycrystalline silicon produced by the inverted aluminum induced crystallization of amorphous silicon films on glass substrates. 15m

The effect of various annealing treatments on the structure properties of crystalline silicon (c-Si) produced by the inverted aluminum induced crystallization of amorphous silicon (a-Si) films was studied. The surface morphology and grain size of c-Si films were observed by optical microscope, SEM and AFM. X-ray diffraction and Raman spectroscopy were used to study quantity of Si crystallization due to thermal annealing. Results showed that the c-Si with average grain size of 27 nm in a (111) orientation were obtained by the thermal annealing at 300 oC for 1 h. Prolonged heat treatment improved Si crystallite quality and increased the average grain size.

Speaker: Ms. Kanyarat Kesrisom (Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand, 10900)
• 15:45
Effect of Copper Oxide Nanoparticles as a barrier for Efficiency Improvement in ZnO Dye-Sensitized Solar Cells 15m

CuO nanoparticles (CuO NPs) were used as a barrier layer in ZnO dye-sensitized solar cells (DSSCs) to obtain high power conversion efficiency. The barrier layer was investigated in terms of the size of CuO NPs by varying power of pulsed Nd:YAG (1064 nm) laser ablation. Morphological and optical properties of CuO NPs were characterized by transmission electron microscopy (TEM), UV-visible spectrophotometry (UV-vis) and dynamic light scattering (DLS). It was found that the CuO NPs are rather spherical in shape with diameter in between 20 - 132 nm. In addition, the energy gap of CuO decreases with the increase of CuO NPs size. The power conversion efficiency of ZnO DSSCs was measured under illumination of simulated sunlight obtained from a solar simulator with the radiant power of 100 mW/cm$^2$. The results showed that the ZnO DSSC with the CuO NPs with size of 37 nm exhibits the optimum power conversion efficiency of 1.01% which is higher than that of one without CuO NPs. Moreover, the power conversion efficiency of the ZnO DSSCs decreases with the increase of CuO NPs size.

Keywords: CuO nanoparticles, dye-sensitized solar cells, laser ablation, ZnO DSSCs

Speaker: Ms. Anongnart Sonthila
• 15:45
Effect of Electromagnetic Fields on oil Palm Germination 15m

Oil palm has widely been grown in Southern Thailand. Nowadays, it has been become an important economic plant. The oil from different varieties are used for bio-energy and industrial uses and also for human consumption. However, production of young oil palm trees is still limited and the plants are expensive because it takes up to 8 months for germination to occur and the germination percentage is only about 60 %. The slow germination rate and the high failure rate leads to additional costs because it makes disease control much more difficult. Electromagnetic Fields (EMFs) are known to increase overall percentage germination and shortens the incubation time of several plant species. We therefore present a physical method to stimulate oil palm germination by treating seeds with EMF. Oil palm seeds were exposed to EMF fields of 100mT to 250 mT and compared to controls. The treatments also were done for different period of times varying from 30 min to 5 hrs. The treated seeds were placed in germinators and sprayed with magnetically treated water. Germination percentages improved on seeds exposed to EMF and the time before germination decreased compared to the controls. The seeds which were exposed to EMFs at of 200 mT for 4 hrs started initial primary root at 8 days after magnetic treatment. There was 30% germination after 8 days incubation and 100% germination after 35 days. The results indicated that electromagnetic fields significantly shorten the time taken for oil palm seeds to germinate and greatly increases the proportion of seeds that do germinate. It reduces germination time of oil palm seeds from 8 months to 8 days and provides very high percentage of germination.

Speaker: ผศ.ดร. ชดาภัษท สุดศิริ (Prince of Songkla University)
• 15:45
Effect of Membrane Tension on Physical Properties of Niosome Bilayers: A Molecular Dynamics Study 15m

Molecular dynamics simulations of niosome bilayer were performed to investigate its physical properties such as area per lipid, volume, thickness, lateral diffusion coefficient, and lipid structural order. The physical properties were computed in the membrane tension ranging from 0 to 15 dyn/cm. All simulations were carried out at the constant temperature of 300 K by using Gromacs package 5.1.2. We found that an increase in membrane tension results in a decrease in the bilayer thickness, area per lipid, volume and lateral diffusion. These results suggest that membrane tension causes significant change not only in the physical properties but also in the stability of noisome formation.

Keywords: Niosome Bilayer, Molecular Dynamics, Surface Tension, Membrane Thickness, Diffusion

Speaker: Ms. Saowalak Somjid
• 15:45
Effect of MnO$_2$ morphology on electrochemical capacitance of supercapacitor electrode 15m

In this study, different surface morphologies of MnO$_2$ (rod, wire, urchin and tube-like MnO$_2$) with an $\alpha$-phase crystalline structure were synthesized via a hydrothermal process by adding various reagents. The crystalline structure and morphology were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, the electrochemical properties were measured using cyclic voltammetry (CV) and galvanostatic charge/discharge (C.D.) in 1 M Na$_2$SO$_4$ aqueous solution. The specific capacitance of rod, wire, urchin and tube-like MnO$_2$ were about 110.20, 73.49, 53.80 and 64.31 F g$^-$$^1. Especially, the rod-like MnO_2 exhibits a highest capacitance of 110.2 F g^-$$^1$ at the current density of 0.5 A g$^-$$^1 due to its smallest size. Speaker: Mr. Authit Phakkhawan (Khon Kaen University) • 15:45 Effect of sputtering power on the properties of co-sputtered Zr-Ti-W metal alloy thin films 15m The Zr-Ti-W metal alloy thin films were fabricated by co-sputtering technique at room temperature. The effect of sputtering power on the thin film properties was investigated by varied power as 100, 200 and 300 W at the constant deposition time. The thickness and surface morphology of thin films were characterized by field-emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM), respectively. The composition of Zr-Ti-W thin films was also analyzed by energy diffraction spectroscopic (EDS). Moreover, the crystallographic of the samples was determined by X-ray diffraction technique (XRD). The results showed that the Zr-Ti-W metal alloy thin films exhibited low surface roughness, amorphous structure, and the compositions of the element were related with the sputtering power. Speaker: Mr. Rattanachai Kowong • 15:45 Effect of Surfactant Concentration to Aggregations of Nanogold Particles. 15m This research presents a study of aggregation of colloidal gold nanoparticles using 400 nm diameter gold nanoparticles mixed with a surfactant (Plantacare 2000) at various concentrations. When observed under a microscope, we found that the nanoparticles aggregated to form nearly spherical clusters at the beginning of the formation, and then sedimented to the bottom of the container. These clusters moved with Brownian’s motion and collided with each other in the horizontal plane, forming branch-like clusters in 2D. The appearance and size of the clusters were different depending on the concentration of surfactant. The clusters’ size and appearance were rarely changed after mixing with surfactant for 90 minutes, and we found that the cluster’s shapes were nearly spherical at low surfactant concentration (c = 0.25%). At surfactant concentration between 0.50% - 5.00%, the aggregates formed branch-like clusters with skinnier branches and smaller sizes at higher surfactant concentration. Moreover, we also found that, at surfactant concentrations between 2.50% - 5.00%, nanoparticles and aggregates stuck to the bottom of the glass container quickly and rarely moved after 10 minutes. At c = 0.25%, the 2D fractal dimension of the aggregates was measured to be D = 1.88 ± 0.04, since the aggregates were nearly spherical. The fractal dimension decreased to the minimum of D = 1.50 ± 0.12 at c = 1.50%, similar to D ~ 1.45 found in diffusion-limited cluster aggregation (DLCA). At surfactant concentration above 1.50%, the fractal dimension increased until it reached the value of D ~ 1.66 at c = 5.00%. Speaker: Ms. Methawee Duangthanu • 15:45 Electrical properties and gas sensing properties of TiO_2/GO nanocomposites for CO_2 sensor application 15m Titanium dioxide (TiO_2) nanostructures were prepared by microwave assisted and varying time. The morphology of TiO_2 nanostructures were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical and gas sensing properties. SEM images revealed nanoparticles cluster of prepared products. XRD patterns showed anatase phase of TiO2 with peak of (101), (004), (200), (105), (211) and (204). The I-V characteristics exhibited the behavior of the ohmic and diodes materials. The sensitivity was measured under CO_2 atmosphere showed high sensitivity of TiO_2/GO composites in 60 second at 2.54. Speaker: Ms. Pitchanunt Chaiyo • 15:45 Electrical Properties of Ultra-thin TiO_2 Compact Layer on FTO for Perovskite Solar cells 15m A TiO_2 compact layer or blocking layer plays a crucial role in a hybrid organic-inorganic lead halide perovskite solar cells because it can prevent the carrier recombination at the interface of fluorine-doped tin oxide (FTO) and perovskite layers. There are many methods to fabricate this layer such as spray pyrolysis or spin-coating which is solution-based synthesis that is difficult to avoid pinholes in the surface of the blocking layer. In this work, TiO_2 blocking layers are fabricated by radio-frequency (RF) magnetron sputtering using Ti metallic target with O_2 partial pressure in Ar atmosphere on FTO coated glasses. The controlled parameters for the deposition of TiO_2 compact layer are RF power, O_2 partial pressure, deposition time and annealing time. The optimization of the TiO_2 compact layers are found from the diode I-V characteristics between the TiO_2/FTO interfaces. The FESEM images as well as optical spectroscopy are used to observe the physical appearance and the optical transmission, respectively. Speaker: Ms. Ramon Songtanasit (Department of Physics, Faculty of Science, Chulalongkorn University) • 15:45 Enhance of hydrophilicity property for gas separation membrane by DC plasma 15m Preparation and surface modification of Polysulfone (PSF) membranes by DC plasma were conducted in order to improve membrane hydrophilicity and gas permeation efficiency. Different type of oxygen (O_2), Argon (Ar), Argon (Ar)/oxygen (O_2) mixture plasma and plasma sequence of O_2 and Ar gasses were employed to modify the membrane surfaces. Characteristics of membrane samples were evaluated through various analytical techniques. Membrane hydrophilicity was determined by water contact angle (WCA) measurement while Fourier transform infra-red (FTIR) spectroscopy was used to analyze the functional groups on the modified surface membrane. We studied the aging condition by measuring the WCA of the plasma-treated surface membrane that recovering to the original condition. For gas separation, the result shows that the permeability of CO_2 is higher than of CH_4 that were explained by electronic properties, polarizability and quadrupole moment. Result also indicated that while the gas permeability of the treated membrane by DC plasma was enhanced but the selectivity of CO_2/CH_4 show a lower performance. Speaker: Mrs. Soraya Ruangdit (-) • 15:45 Fabrication and Physical Properties of Titanium Nitride/Hydroxyapatite Composite on Polyether Ether Ketone by RF Magnetron Sputtering Technique 15m Titanium nitride coatings have been used very successfully in a variety of applications because of their excellent properties, such as the high hardness meaning good wear resistance and also used for covering medical implants. Hydroxyapatite is a bioactive ceramic that contributes to the restoration of bone tissue, which together with titanium nitride may contribute to obtaining a superior composite in terms of mechanical and bone tissue interaction matters. This paper aim to optimize deposition conditions for films synthesis on PEEK by varying sputtering parameters such as nitrogen flow rate and direction, deposition time, d-s (target-to-substrate distance) and 13.56 MHz RF power. The plasma conditions used to deposit films were monitored by the optical emission spectroscopy (OES). Titanium nitride/Hydroxyapatite composite films were performed by gas mixture with nitrogen and argon ratio of 1:3 and target-to-substrate distance at 8 cm. The gold color, as-deposited film was found on PEEK with high hardness and higher surface energy than uncoated PEEK. Keyword: Titanium Nitride, Hydroxyapatite, RF magnetron sputtering, Polyether ether ketone Speaker: Wasin Nupangtha (Chiang Mai University) • 15:45 Fabrication of carbon sphere film as a supercapacitor electrode 15m In this work, carbon sphere films at different growth temperature of 180, 200 and 220°C were synthesized by 10 hrs hydrothermal process from glucose to apply for supercapacitor electrode. The carbon sphere films were washed and filled by DI water for several times. Finally, they were kept it in an oven at 80°C to dry. Crystal structure and film morphology were analyzed by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Supercapacitor performance were studied by cyclic voltammetry (CV), charge-discharge (CD) and electrochemical impedance spectroscopy (EIS). The specific capacitance of carbon sphere electrode grown at 180, 200and 220°C are about 12.6, 3.3 and 2.9 F/g, respectively. The highest specific capacitance was achieved at 180°C. The dependence of growth temperature on film specific capacitance will be discussed in detail later. Keywords: carbon sphere, supercapacitor, glucose, charge/discharge Speaker: Ms. Suklitta Thongkhem (Khon Kaen University) • 15:45 First-principles study of H_2 adsorption on two-dimenstional C_2N sheet 15m First-principles calculations based on density functional theory (DFT) have been performed to study the adsorption of molecular H_2 on the graphene-like material C_2N. The possible adsorption sites on top of bonds, on carbon atom and nitrogen atom and the center of C-C hexagon and the C-N hexagon are considered. The adsorption energies for each site are calculated and are found to be in the physisorption regime. We find that the most favorable site of H_2 is above the center of C-N hexagon. In addition, we demonstrate that inclusion of the Van der Waals interactions through the DFT-D2 method via the generalized gradient approximation (GGA) functional gives the consistent trend of H_2 adsorption with that obtained via the local-density approximation (LDA) functional. The effects of Van der Waals interactions on the adsorption energies and equilibrium distance between H_2 and C_2N sheet are discussed. Speaker: Mr. Pongdet Netrattana (Department of Physics, Faculty of Science, Kasetsart University) • 15:45 Fission Product Behavior in High-Temperature Water: CsI vs MoO_4 15m Fission product behaviors of Cs, a major element released in a severe nuclear accident, still remain unclear. The question frequently addressed is whether Cs released will be in the form of CsMoO_4 or CsOH. This is a challenging issue since it has been demonstrated that the reaction between CsMoO_4 and water leading to CsOH production is thermodynamically favored. The present research aims at investigation of CsOH generation through this chemical channel. A high-temperature setup with a flow system based on the cooling system of a water-cooled nuclear reactor has been assembled. The reaction between aqueous solutions of CsI and NaMoO_4 in a high-corrosion-resistant hot cell (Hastelloy) has been studied up to 80^oC both in air and deoxygenated system. The products have been characterized using XRD and FTIR. Speaker: Dr. Kotchaphan Kanjana (Thailand Institute of Nuclear Technology) • 15:45 Flipped Classroom Enhances Students’ Performance in Physics Learning 15m A flipped classroom is an instructional strategy and a type of blended learning that reverses the traditional learning environment. Instead of spending entire periods watching a lecture, students watch lectures online outside of class time and use class time to do activities. The 35 pre-engineer students had been taught by flipped classroom on the topics of work and energy in Physics course. The study shows that the use of the flipped classroom in the learning process enhances students’ motivation and improves their performance more than traditional classroom Speaker: Mr. Prakasit Changsuphan • 15:45 Fractal dimension of synthesized sound wave 15m An important aspect of musical structure that allows discrimination between different sounds is the timbral characteristic. Although, there has been significant interest in the application of fractal theory as a tool for the analysis of musical structure, no such study has been done to investigate timbre on physical modeling sound synthesis. In this paper, we examine the changes of timbre and estimate fractal dimension of musical signals which synthesizes by three physical modeling methods: Karplus-Strong algorithm, functional transformation, direct numerical simulation. The results indicate that fractal analysis can identify the timbral characteristic regarding the underlying physical factors that distinguish the different between sounds. Speaker: Mr. Manorth KANJANAPEN (Department of Physics, Faculty of Science, Kasetsart University) • 15:45 Frequency Distribution of Specific Activities and Radiological Hazard Assessment in Surface Beach Sand Samples Collected from Bangsaen beach in Chonburi Province, Thailand 15m The specific activities of natural radionuclides (^4$$^0$K, $^2$$^2$$^6$Ra and $^2$$^3$$^2$Th) in 50 surface beach sand samples collected from Bangsaen beach in Chonburi province in the easthern region of Thailand, were measured and evaluated. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system in the special laboratory at Thailand Institute of Nuclear Technology (Public Organization). The IAEA-SOIL-375 reference material was used to analyze the concentration of $^4$$^0K, ^2$$^2$$^6Ra and ^2$$^3$$^2Th in all samples. It was found that the specific activities of ^4$$^0$K, $^2$$^2$$^6$Ra and $^2$$^3$$^2$Th were ranged from 510.85 - 771.35, 8.17 - 17.06 and 4.25 - 15.68 Bq/kg. Furthermore, frequency distribution of the specific activities were studied, analyzed and found to be the asymmetrical distribution by using a statistical computer program. Moreover, four radiological hazard indices for the investigated area were also calculated by using the median values of specific activities of $^4$$^0K, ^2$$^2$$^6Ra and ^2$$^3$$^2Th. The results were also compared with the Office of Atoms for Peace (OAP) annual report data, Thailand and global radioactivity measurement and evaluations. Speaker: Nopparit Changkit • 15:45 Gamma Ray Evaluation of Fast Neutron Irradiated on Topaz from Sri Lanka by HPGe Gamma Ray Spectrometry 15m The purpose of this study was to evaluate the radionuclide concentrations of London blue topaz after fast neutron irradiation. The London blue topaz was obtained from Sri Lanka which classified into dark and light colors in the shape of an oval and rectangle with small, medium and large size. The optical property and radionuclide concentrations of London blue topaz have been examine by UV - Visible spectroscopy and HPGe gamma ray spectrometry, respectively. The UV - absorption spectra of topaz was taken in the range of 300 to 800 nm at room temperature. The results showed that the absorption peak of topaz was observed with only broad peaks in the range of 550 to 700 nm and 630 nm that correlated to the O - center in hydroxyl sites which substitutes for fluorine in topaz structure. The radioactivity of dark and light colors in the shape of an oval and rectangle London blue topaz was in the range of 1.437 ± 0.014 to 21.551 ± 0.037 nCi/g (oval dark), 2.958 ± 0.031 to 6.748 ± 0.054 nCi/g (oval light) and 2.350 ± 0.014 to 43.952 ± 0.088 nCi/g (rectangle dark), 1.442 ± 0.023 to 6.748 ± 0.054 nCi/g (rectangle light), respectively. The decay rates of ^4$$^6$Sc, $^1$$^8$$^2$Ta and $^5$$^4Mn isotopes created by irradiation showed that the time decay of the radioactive element depended on the size of the topaz so increased with decreasing the size of topaz. Moreover, the size of topaz also affect the absorption coefficient. This study is applied to predict time of residue dose of topaz for enhancement colorless topaz by neutron radiation treatment. Speaker: Ms. Kanokwan Boonsook (Department of Physics, Faculty of Science, KMUTT) • 15:45 Gas Sensing Response of Nickel Doped Calcium Copper Titanate Thin Films Synthesized by Sol-gel Method 15m Nickel-doped calcium copper titanate (CaCu3Ti4O12: CCTO) thin films were synthesized by a sol-gel method. All films were spin-coated with four layers on silicon and alumina substrates, and each film layer was annealed at a fixed annealing temperature of 800 °C. The obtained samples with different doping concentrations (0-7.27 wt%) were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoe-lectron spectroscopy (XPS). From XRD patterns, CCTO and Ni-doped CCTO films were cubic perovskite phase with small amount of impurity phases of TiO2. The film thickness of approximately 320-600 nm were obtained using FE-SEM. In addition, 7.27 wt% Ni-doped CCTO film showed more porosity than other films. The film gas sensors were probed to measure gas sensing responses towards different types of gases such as NO2, H2, NH3, H2S and ethanol gas. All samples performed the best selectivity towards H2S. Compared with other films, the 7.27 wt% Ni-doped CCTO film sensors exhibited the highest response of 112 for 10 ppm of H2S with the optimum temperature of 250 °C. Speaker: Ms. Arisara Boontum (Department of Physics, Faculty of Science, Chulalongkorn University 254 Phyathai Road, Patumwan, Bangkok Thailand. 10330) • 15:45 Hardness Enhancement on Stainless Steel Surface by Coating Graphene Film Using Thermal Chemical Vapor Deposition 15m Stainless steel is steel alloy consisting of many elements including iron (majority), chromium, nickel and sulfur. Stainless steel has been widely utilized because it is more effective in terms of resistance of corrosion, rust or stain than ordinary steel. However, the electrical conductivity and surface hardness of stainless steel are not high. These disadvantages limit the engineering application of stainless steel from wide range to some range. Graphene is an allotrope of carbon, in which carbon atoms are arranged into a one-atom-thick honeycomb lattice. Graphene has a variety of exotic properties such as great electronic properties and excellent mechanical properties. In this report, therefore, we have investigated hardness enhancement on stainless steel surface after coating graphene film by thermal chemical vapor deposition. The results show the hardness of stainless steel after coated with graphene is ~10 times higher than original stainless steel. Speaker: Akkawat Ruammaitree • 15:45 Hydrophobic thiol-ene surfaces fabricated via plasma activation and photo polymerization 15m Alumina, such as glazed alumina for electrical insulator, operated in an open field subjects to a very harsh condition; resulting in lifetime shortening. Coating hydrophobic layer on alumina surface can help prolonging its lifetime. In this study, 25x25 mm alumina sheets were used as substrates. The hydrophobic composite polymers were prepared by (3-mercaptopropyl) trimethoxysilane (MPTMS), 2,4,6,8-tetramethyl-2,4,6,8 tetravinylcyclotetrasiloxane (TMTVSi), pentaerythritoltetra(3-mercaptopropionate)(PETMP), 2,2-dimethoxy-2-phenylaceto phenone(photoinitiator) and heptadecafluorodecylmethacrylate(HEFDMA) via the thiol-ene reaction. The alumina sheets were first activated by dielectric-barrier discharge plasma to improve its adhesion.All the polymers were found to optimize at the ratio of (MPTMS:TMTVSi:PETMP:HDFDMA) to 4:2:1:2 for coating on the alumina substrate. To enhance polymerization, 2,2-dimethoxy-2-phenylaceto phenome was also used as a photoinitiator A proper mixing sequence in the thiol-ene reaction results in film with excellent surface retention after prolong soaking in solvent such as acetone. FTIR shows that S-H and C=C functional groups have significantly changed after photopolymerization and thermally cured. The static contact angle increase from mere 53.0^{\circ}$$\pm$1.5$^{\circ}$ of the uncoated substrate to 120.0$^{\circ}$$\pm1.2^{\circ} after coating. SEM shows the film with clear appearance of a few-micron thick. Under AFM, the coated surface roughness was about 9.3 nm with evenly distributed spikes of a few nanometer in height. The cross-cut test also confirmed the film was very smooth and none of the square of the films detached. Speaker: Peera Champathet • 15:45 Improved Efficiency of Polymer Solar Cells by mean of Coating Hole Transporting Layer as Double Layer Deposition 15m Polymer solar cells is one of the promising technologies that gain tremendous attentions in the field of renewable energy. Optimization of thickness for each layer is an important factor determining the efficiency of the solar cells. In this work, the optimum thickness of Poly(3,4-ethylenedioxythione) : poly(styrenesulfonate) (PEDOT:PSS), a famous material widely used as hole transporting layer in polymer solar cells, is determined through the consideration of device’s power conversion efficiency (PCE). The structure of ITO/PEDOT:PSS/PCDTBT:PC_\text{71}BM/Tio_\text{x}/Al was employed to fabricate the solar cells by rapid convective deposition. The thickness of PEDOT:PSS layer was varied via the deposition speed. Furthermore, double layer deposition of PEDOT:PSS was introduced as an approach to improve solar cell efficiency. To confirm the enhancement of solar cell efficiency, PEDOT:PSS films were characterized by the combinations of microscopic and spectroscopic techniques. The results obviously reveal that, with the optimized thickness, the PCE of the device reaches 4.03%. Interestingly, using double layer deposition of PEDOT:PSS shows the ability to enhance the performance of the solar cells to 6.12% under simulated AM 1.5G illumination of 100 mW/cm^2. Speaker: Ms. Teantong Chonsut (College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang) • 15:45 Improving of QRS complex detection in ECG signal Using Combination of Fourier Transform and Wavelet method 15m Electrocardiography (ECG) signal is very important signal for identifying heart disease. It composes of five main characteristics which can be specified by the P-QRS-T signals. One of the most important segment in the signal is the QRS complex because it is the heart activity that electricity run all over heart which can tell many heart disease. There have been many studies on identifying the complex location and interval in the ECG. For instance, in field of physics, electronic circuit simulations were used to image QRS complex for identifying heart disease. However, in complex simulation, there requires primitive knowledge where the location of QRS complex, which is unknown parameter and has to guess from visual inspection. On the other hand, in the field of signal processing area, a regular used technique to achieve this QRS characteristic is the application of the wavelet transform to identify QRS signal. Although, this technique has proved that it has high accuracy in detecting QRS complex, it too bases mainly on trial and error method where one firstly need to estimate and guess where about the QRS is and how long the QRS interval lasts. Therefore, to overcome this problem, this study aim to provide an automate technique to replace the estimating module by firstly coarse scanning for QRS complex position using Fourier Transformation. After that, the wavelet transform will be used as fine scanner to specify more precise QRS complex position. Twenty ECG signals with various characteristic, such as shockable rhythms and non-shockable rhythms, were investigated in this work. To detect QRS complex, Fourier Transform was used to identify fundamental frequency range of ECG by choosing the ones with comparatively high amplitudes. After that, these frequencies were added to Wavelet method to identify the range of interest for extracting Wavelet coefficients. After that, the Wavelet function was used to transform ECG signal and mark the position of QRS complex. From our preliminary results, the Fourier Transform can extract unique frequencies for each type for the Wavelet to locate QRS complex position, where more than 98% accuracy on the results was obtained. Note that without our proposed Fourier Transform part, using only Wavelet Transform in some ECG type gives less than 80% accuracy. This implies that our combined Fourier and Wavelet Transforms technique in detecting QRS complex position in normal and abnormal ECG signals, and may help to specify heart diseases with more reliability and efficiency. Therefore, one can elaborate our proposed module to design automatic heart disease diagnostic system, which can benefit medics outside heart diagnostic field for initialize emergency treatment of sudden heart attack. Speaker: Jutarop Reungyos • 15:45 In-house development of neutron moisture gauge for field measurement 15m The measurement of moisture content in soil is based on the principle of neutron back scattering. In this principle, when fast neutrons emitted from a radioactive source collide with hydrogen atoms their energies are much greater reduced than colliding with other atoms. The number of slowed down neutrons, hence, represents the number of hydrogen atoms present in the vicinity of the source. As water is the main contributor of hydrogen atoms in a soil medium, the moisture content in soil, therefore, can be measured based on this principle. An in-house developed probe containing a source of fast neutrons and a slow neutron detector was inserted into soil at different depths under the ground level. The probe was made of high density polyethylene and connected to a suitably calibrated detection system by a single cable. The moisture content was determined from the slow neutron count rate. The results of field measurement tests were reported and discussed. Speaker: Ms. Parichat Sinkaew (Department of Physics, King Mongkut’s Institute of Technology Ladkrabang) • 15:45 Influence of Thermal Annealing Process on Vanadium Oxide Thin Films for Metal-Insulator Transition Enhancement 15m Metal-insulator transitions (MIT) are reversible changes in the conductivity of materials when the temperature above or below the transition point, which are the smart transitions in advanced material. Vanadium oxide (V_\text{x}O_\text{y}) demonstrated excellent MIT characteristics at the transition temperature (T_\text{c}) due to the lattice distortion. However, V_\text{x}O_\text{y} has many phases such as V_\text{2}O_\text{5}, V_\text{2}O_\text{3}, VO_\text{2}, VO, which have the different transition temperature. In this work, we study the influence of an annealing process to improve the MIT of V_\text{x}O_\text{y} thin film on glass substrates. V_\text{x}O_\text{y} thin films were prepared by the pulsed DC magnetron sputtering technique at room temperature by various gas ratios between Ar and O_\text{2}. Then, the crystal structures of V_\text{x}O_\text{y} thin films were investigated by X-ray diffraction. X-ray diffractrograms of as deposited V_\text{x}O_\text{y} thin films did not show the crystallinity index of material. To improve the MIT or the crystalinity of V_\text{x}O_\text{y} films, the controlled ambient annealing process was applied to deform grains and recrystallize of the material. Consequently, as deposited V_\text{x}O_\text{y} thin films were annealed under control N_\text{2} pressure, and the temperature was set at 400^°C to avoid the deformation of thin film at the high annealing temperature. After annealing process, the MIT characteristics of V_\text{x}O_\text{y} thin films were measured by four points probe technique between 30-150 ^°C. Surprisingly, the V_\text{x}O_\text{y} thin films exhibit the MIT behavior in two orders of magnitude. We found the formation of V_\text{2}O_\text{5} from XRD patterns of thin films, and other phases such as V_\text{2}O_\text{3}, VO_\text{2} also discovered. Moreover, the Raman spectra of thin films show the vibration modes of V_\text{2}O_\text{5} to confirm the effect of annealing process on the V_\text{x}O_\text{y} crystal formation. Our preliminary study is promising method to improve the crystal formation of V_\text{x}O_\text{y} thin film and enhance the MIT for further electronics applications. Speaker: Mr. Sukittaya Jessdaluk (College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand) • 15:45 Influence of Under-layers morpholgy on Structural and Magnetic Properties of Sputtered Co81Pd19 Film. 15m Sputtered Co81Pd19 films with thickness of about 60 nm were deposited on various under-layers (Al, Co, Cr, Cr and Ni) and on glass substrate. Structural, morphological and magnetic properties of Co81Pd19 films were investigated. All of prepared films showed CoPd (FCC) phase in (111) plane. Co (HCP) phase in (200) direction was observed in the films deposited Al, Cr and Ni under-layer and on glass substrate whereas the film on Co-under-layer exhibited Co (HCP) phase in (201) plane. AFM images revealed that the film on Al and Co under-layers exhibited the maximum roughness with highest grain size and the minimum roughness with lowest grain size, respectively. Both parallel and perpendicular maximum coercive field were found in the film on Ni under-layer and the film on Co-under-layer film showed the highest saturation magnetization both in-plane and out-of-plane measurements. These results confirmed that the structural and magnetic properties of sputtered Co81Pd19 film was affected by under-layer surface roughness and morphology by virtue of particle size and distribution on the under-layer film surface. Speaker: Pairin Ponchaiya • 15:45 interference of two vortex beams with different topological charge numbers 15m Optical vortex is a mode of light whose phase distribution varies as e^{im\phi }, where m is called the topological charge of the vortex and {\phi} is an azimuthal angle in the plane perpendicular to the propagating direction. The vortex beam of charge m carries an orbital angular momentum of mℏ and has its application in manipulating micrometer-sized particles. A common method to detect topological charges of optical vortices is interference with a tilted Gaussian beam. In this work, we study the interference pattern of two vortex beams with different topological charges, created by spatial light modulators (SLMs). We find fork-like fringes similar to those observed from the interference between a vortex and a Gaussian beam. The fringe difference between the top and the bottom of the fork equals the difference between the topological charges of the two vortices, as predicted by the theory. When the topological charges are the same, the fork pattern disappears. We suggest the result can be used to detect topological charges of vortex beams. Speaker: Ms. Suvipak Chumdaeng (Department of Physics, Faculty of Science, Kasetsart University) • 15:45 Investigating Student understanding of Simple harmonic motion 15m This study aimed to investigate students’ understanding and develop instructional material on a topic of simple harmonic motion. Participants were 80 students taking a course on vibrations and wave on the 2nd semester of an academic year 2016. A 20-question conceptual test and tutorial activities had been developed from previous research findings and evaluated by three physics experts in teaching mechanics before using in a real classroom. Data collection included both qualitative and quantitative methods. Item analysis and whole-test analysis were determined from student responses in the conceptual test. As results, most students had misconceptions about restoring force and they had problems connecting mathematical solutions to real motions, especially phase angle. Moreover, they had problems with interpreting mechanical energy from graphs and diagrams of the motion. These results were used to develop effective instructional materials to enhance student abilities in understanding simple harmonic motion in term of multiple representations. Speaker: Pornrat Wattanakasiwich • 15:45 Investigation of L-H-L Transitions Criteria and Hysteresis Based on Bifurcation Concept 15m Investigation of L-H-L Transitions Criteria and Hysteresis Based on Bifurcation Concept A. Dang-Iad^{1*} , T. Onjun^2 and B. Chatthong^1 , 1Department of Physics, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand 2 Former Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, Thailand This research aims to study the criteria for the forward L-H transition and backward H-L back transition as well as hysteresis depth in tokamak fusion plasmas based on bifurcation concept. Three transport equations including thermal, particle and toroidal momentum density are solved simultaneously, resulting in the prediction of plasma pressure, plasma density and toroidal velocity profiles at steady state. The transport effects include both neoclassical and anomalous transport with velocity shear dependent suppression function. The results show that the flux (thermal/particle/momentum) versus gradient (pressure/density/velocity) space exhibits s-curve bifurcation nature in which a forward L-H transition requires higher flux than that of the backward H-L transition, hence hysteresis behaviors. In addition, it is found that ratio of the plasma flux at the forward L-H transition over the backward H-L transition depends sensitively on thermal, particle and toroidal momentum neoclassical and anomalous transports. Keyword: bifurcation, hysteresis, transport barrier Speaker: Mr. APISIT DANG-IAD • 15:45 Isotopic Composition of Precipitation at Ongkharak District, Nakhon Nayok Province 15m In this work the utilization of nuclear hydrological instruments using Liquid Scintillation Counter (LSC) and laser absorption spectrometer (Cavity Ring-Down Spectrometer, CRDS) were employed. All samples from the precipitation were treated for isotopic instruments. Tritium values were analyzed with electrolytic enrichment and LSC while deuterium and oxygen-18 were calculated on CDRS. As a result, tritium values ranged 0.6-13.3 TU (tritium unit), deuterium values are between -76.44 and -7.5 ‰ (per mil) and oxygen-18 values show -10.67 to -2.42 ‰. The data of tritium and stable isotope can be used to input data for studying the dynamics of groundwater in Ongkharak area. Keywords: Isotope hydrology, tritium, stable isotope Speaker: Mr. Chakrit Saengkorakot • 15:45 Learning Particle Physics with DIY Play Dough Model 15m The scientists once believed an atom was the smallest particle, nothing was smaller than this tiny particle. Later, they discovered an atom which consists of protons, neutrons and electrons, and they believed that these particles cannot be broken into the smaller particles. According to advanced technology, the scientists have discovered these particles are consist of a smaller particles. The new particles are called quarks and gluons which we called fundamental particle. Atomic structure cannot be observed directly, so it is complicated for studying these particles. The aim of the study are (1) to help students get more understanding, the researcher made particles model from “Play Dough”, (2) to develop creativity in students and cooperative learning among students. Speaker: Ms. Thittima Thunyaniti (Faculty of Science, Ubonratchathani University) • 15:45 liposomes fabrication using vortex rings generated microfluidic device 15m Liposomes are phospholipid vesicles enclosing aqueous solution. Liposomes are used in many biomedical applications such as drug delivery and artificial cell models. Giant unilamellar vesicles (GUVs) fabrication using vortex ring in microfluidic device offers advantages over traditional GUVs fabrications such as rapid fabrication and controllable uniform vesicle sizes distribution. The phospholipid bilayer interface inside microfluidic reservoir is disturbed by collision of vertex rings producing by pulse injection in microchannel, leading to formation of droplet enclosed by phospholipid bilayer. Computational fluid dynamics simulation was carried out to vary phospholipid bilayer interface area and injection pulsing parameters in order to achieve desirable vortex ring sizes. Speaker: Mr. Sorawit Sanin (Department of Physics and Materials Sciences Chiang Mai University) • 15:45 Liquid absorption using 3D carbon nanofiber scaffolding derived from bacterial cellulose 15m ABSTRACT 3D carbon nanofiber scaffolding was produced from the pyrolysis of freeze-dried (FD) bacterial cellulose (BC). The thermogravimetry and differential thermal analysis (TG/DTA) showed the weight loss of BC during the pyrolysis process. The X-ray diffraction technique showed the high crystallinity of the FD-BC and the high amorphousness of the carbon nanofibers. Both FD-BC and the pyrolyzed carbon nanofibers consisted of tiny fibers with the size of<100 nm. The liquid absorption capacity using FD-BC and carbon nanofibers was tested by measured the weight before and after absorption. It was found that the FD-BC was good for water absorption due to the hydrophilic nature of the sample. For the organic solvent, ethanol, methanol, benzene, and palm oil, the hydrophobic carbon nanofibers had the absorption capacity of nearly hundred times of their own weight. Speaker: Mr. Surachat Sombat (Khon Kaen University) • 15:45 Low Cost and Disposable Lab on a Chip 15m In this research, a low cost and disposable lab on a chip was designed and fabricated by screen printing. The chip was designed with integrated digital microfluidic microchip and electrochemical detector on single plate substrate. For the design, the chip consist of T-junction EWOD digital microfluidics microchip for merging buffer reagent and analyze droplets and an electrochemical detector at the end of T-junction EWOD. Both parts were fabricated by screen printed technique for supporting low cost manufacturing process. The EWOD microchip consists of silver paste for electrodes layers and PDMS for dielectric and Teflon® AF hydrophobic layers. Three electrodes of electrochemical detector consists of a carbon paste working electrode and a carbon paste counter electrode, and silver/silver chloride paste reference electrode for rapid analysis with minimal reagent consumption. In experiment, the electrochemical detector combine with EWOD microchip was tested to study possibility of moving (merging and transporting) ionized droplet and samples (buffer and analyzed droplet) on the microchip. For analysis, the EWOD chemical detector was analyzed for nicotinamide adenine dinucleotide for rapid analysis with minimal reagent consumption. Speaker: Mr. Anan Saenkhamai • 15:45 Measurement and Analysis of Specific Activities of Radionuclide 40K, 226Raand 232Th in Beach Sand Samples from Talo kapo beach Yaring DistrictinPattani Province using Gamma Ray Spectrometry 15m The Specific Activities of ^{40}K, ^{226}Ra and ^{232}Th were determinet for 30 beach sand samples collected from Talo kapo beach Yaring District in Pattani Province. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system. Gamma ray radioactive standard sources ^{137}Cs and ^{60}Co ware used to calibrate the measurement system. The IAEA-SOIL-6 reference materials obtained from the International Atomic Energy Agency Were also used to analyze and compute the 40K, ^{226}Ra and ^{232}Th specific activity in all 30 beach sand samples, respectively. The measuring time of each samples is 10,000 seconds. It was found that specific activity range from 1805.37 – 3,323.05 Bq/kg for ^{40}K, 40.96 – 2,137.36 Bq/kg for ^{226}Ra and 38.63 – 4,329.28 Bq/kg for ^{232}Th with mean values of 2,242.79 ± 117.40 Bq/kg, 250.18 ± 8.21 Bq/kg and 458.42 ± 7.68 Bq/kg respectively. Moreover, the results were compared with research data in the south of Thailand, the Office of Atoms fror Peace (OAP) annual report data and the recommended values which were proposed by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSEAR, 1988. 1993, 2000) Speakers: Ms. Yameela Mhudchudchu (Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University) , Ms. Areeya Tamat (Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University) , Ms. Masae Masae (Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University) , Ms. Supeeya Pao-oh (Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University) • 15:45 Mechanical properties of cement paste containing iron powder 15m Mechanical properties of cement paste containing iron powder Nattapong Chuewongkam1, Panjasil Payakaniti2,Supree Pinitsoontorn1,2,3 1Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002 THAILAND 2 Materials Science and Nanotechnology Program, Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002, Thailand 3Integrated Nanotechnology Research Center, Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002 THAILAND Abstract This research project studied the mechanical properties of the iron paste containing metal powder. The amounts of the iron powder additives were 10, 20, 30, 40, 50, 60 and 70% by weight of cement. Water to cement ratio was controlled by measuring workability. The universal testing machine as used to measure mechanical property. Which showed that adding iron powder enhanced the compressive strength of the cement paste. The microstructure was studied by using a scanning electron microscope. The correlation between microstructure and strength was discussed. Keywords: Cement paste; Iron powder; Compressive Strength Speaker: Mr. Nattapong Chuewongkam (Department of Physics) • 15:45 Microfluidic System for E.coli Electroporation 15m Electroporation is the technique in which external electrical field is applied across cells of interest to create pores on cell membrane when the voltage across the cell membrane is high enough. Electroporation is commonly used to deliver exogenous reagents such as genes, drugs, and nanoparticles for therapeutic purposes. In this work, microfluidic device was fabricated using Printed Circuit board technique. Several planar Indium Tin Oxide (ITO) electrodes shapes were attached on glass slide and microchannel was place between two electrodes in the longudinal direction. E.coli was used as a cell model in electroporation experiment. The 12- 50 AC voltage with 1,000 Hz frequency. Fluorescence dye was used for real time electroporation monitoring. Speaker: Jongrak Sanglao (Chiangmai University) • 15:45 Microstructure of CaCu_3Ti_4O_{12}/SrTiO_3 and CaCu_3Ti_4O_{12}/BaTiO_3 multilayered thin films grown on LaAlO_3 (100) substrates for dielectric tunability 15m CaCu_3Ti_4O_{12}(CCTO)/SrTiO_3(STO) and CaCu_3Ti_4O_{12}(CCTO)/BaTiO_3(BTO) films multilayered heterostructures were successfully synthesized on LaAlO_3 (LAO) (100) substrates via a sol-gel method. The annealing temperature was fixed at 800 °C for one hour for each deposition. Our films were deposited with conditions as follows; CCTO/CCTO/CCTO/CCTO, STO/STO/STO/STO, CCTO/STO/CCTO/STO (1L-CCTO/STO), CCTO/CCTO/STO/STO (2L-CCTO/STO), CCTO/CCTO/BTO/BTO (2L-CCTO/BTO) and CCTO/BTO/CCTO/BTO (1L-CCTO/BTO) on LAO substrates. From X-ray diffraction patterns, it was concluded that the CCTO, STO films and their multilayers deposited on LAO (100) substrates tend to be predominantly (h00) oriented, whereas BTO and its multilayers show polycrystalline orientations. Based on our analysis, CCTO films have a cubic structure with estimated lattice parameters of 7.376 Å (3.688 Å) and for STO with estimated lattice parameters of 3.888 Å, while LAO has a pseudo-cubic structure with a calculated lattice constant of 3.790 Å. Interestingly, the TiO_2 commonly presented as an impurity phase in CCTO films was suppressed in CCTO/STO multilayered films. The surface morphology and the interface layers of the films were characterized by FE-SEM technique. For electrical measurement, 1L-CCTO/STO and 2L-CCTO/STO have dielectric constants of 1000 and 820 at 100 kHz, respectively. The loss tangent values measured at the frequency above 10 kHz of both 1L and 2L-CCTO/STO films are approximately 0.07. Despite being stacked up with non-tunable dielectric materials, 1L-CCTO/STO thin films can be tuned in range of 1.6% at 10 kHz. Speaker: Mr. Wiwittawin Sukmas (Chulalongkorn University) • 15:45 Minimization of the synthetic androgen 17Alpha-methyltestosterone hormone for sex reversal of Nile tilapia eggs using electrical technique 15m With the realization of widespread use of large quantities of sex reversal hormone of the synthetic androgen 17Alpha-methyltestosterone (MT) affect on the environment and the inefficiency and cost of the conventional techniques, the hormonal sex reversal of economic fish needs to modified to avoid the excess use of MT, lessen the duration of treatment and lower the cost of MT hormone used relative the conventional technique of sex reversal by the feed-fry hormone treatment. This work employs our expertise in electroporation of cells to enhance sex reversal in Nile Tilapia eggs to minimize 2,000 times consumption of the treatment and androgen hormone dose (less than 3,600 times) compared to the conventional feed-fry treated and immersion techniques. This novel technique using the transient high-intensity electric fields has potential since it is non-invasive, with no-stress acting on the membrane. The technique could be used to load cells with a variety of different molecules, either through simple diffusion in the case of small molecules, or through electrophoretically driven processes allowing passage through the destabilized membrane. The technique and equipment was designed for large-scale inductions of eggs suspensions (commercial farm in Thailand had requested order more than 1 million-induction eggs/week) rather than for individual eggs aimed at commercialization. Speaker: Prof. Dr.Sakshin ฺBunthawin (Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus ) • 15:45 Modification of Calcium Copper Titanate Thin Films by Adding Ag Compounds and their H2S Gas Sensing Response 15m Ag-doped CaCu3Ti4O12 (CCTO) thin films with different doping concentrations were prepared by a sol-gel technique. Films were grown by depositing four layers of CCTO on alumina substrates followed by sputtering Au/Cr interdigitated electrodes to fabricate gas sensors. The films were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). The films have predominantly the perovskite CCTO crystal phase with very small amount of TiO2 secondary phases. In this work, both undoped CCTO and Ag-doped CCTO thin films were tested for selective sensing to H2S gas relative to NH3, H2, NO2 and ethanol vapor. For characterizing gas sensing properties of the films, gas concentrations in the range of 0.2-10 ppm were used with operating temperatures ranging from 150 to 350 °C. When compared to undoped CCTO sensor, the Ag-doped CCTO sensors presented much higher response. The best sensitivity towards H2S was found in 0.9 wt% Ag-doped CCTO film and at the optimum operating temperature of 250 °C. The highest response of the sensor based on the 0.9 wt% Ag-doped CCTO film to 10 ppm of H2S is approximately ten times than that of a sensor based on undoped CCTO film. The doped film sensor also showed stability and relatively short response and recovery times. Therefore, Ag-doped CCTO films with small doping concentration constitute an excellent candidate for developing H2S sensors operating at low-temperatures. Speaker: Mr. Aukrit Natkaeo (Department of Physics, Faculty of Science, Chulalongkorn University) • 15:45 Observation of Spin Seebeck Effect in Bulk Strontium Ferrite 15m ABSTRACT Spin Seebeck effect (SSE) can be observed in magnetized ferromagnetic materials when subjected to a temperature gradient.In this work, the results on the SSE in the bulk strontium ferrite were demonstrated for the first time. The SSE measurement was developed in our lab and calibrated with a Y3Fe5O12 standard sample. The bulk strontium ferrite was characterized for the crystal structure and magnetic properties. It was then cut, ground and polished, before the Pt film was deposited on the surface. When subjected to the magnetic field and temperature gradient, the strontium ferrite showed the SSE signal which could be measured via the inversed spin Hall effect (ISHE). The SSE voltages measured across the Pt film showed the dependence on the magnetic field, the temperature gradient, and the Pt thickness, with the maximum signal of about 200 nV/K. Speaker: Mr. Champ Suksawat (Khon Kaen University) • 15:45 One dimensional two-body collisions experiment based on LabVIEW interface with Arduino 15m The purpose of this work is to build a physics lab apparatus that is modern, low-cost and simple. In one dimensional two-body collisions experiment, we used the Arduino UNO R3 as a data acquisition system which was controlled by LabVIEW program. The photo gate sensors were designed using LED and LDR to measure position as a function of the time. Aluminum frame housewares and blower were used for the air track system. In both totally inelastic and elastic collision experiments, the results of momentum and energy conservation are in good agreement with the theoretical calculations. Speakers: Parinya Saphet (CRRU) , Dr. Anusorn Tong-on (CRRU) , Dr. Meechai Thepnurat (Chiang Rai Rajabhat University) • 15:45 One step hydrothermal synthesis of CNTs-NiS films for counter electrodes in dye-sensitized solar cells 15m Nickel sulfide (NiS) nanoparticles were grew on multiwall carbon nanotube (CNTs) and coated onto FTO-glass by the one step hydrothermal method at 160°C. These films were applied as counter electrodes (CE) for dye-sensitized solar cells (DSSCs). In the present work, electrocatalytic activity and electron-charge transfer resistance are investigated though cyclic voltammetry and electrochemical impedance spectroscopy measurements, respectively. Likewise, an effective surface area of counter electrode is presented and analyzed. Power conversion efficiency (PCE) enhancement of up to 24% (7.48% efficiency) from pure NiS (6.21% efficiency) is demonstrated for a CNTs-NiS DSSC. Speaker: Dr. Wasan Maiaugree (Khon Kaen University) • 15:45 Optical and Structural Properties of Dye Sensitized Composite Semiconductor Photoanode 15m ZnS, a wide band gap semiconductor and good candidate for dye sensitized semiconductor solar cell (DSSC) photoanode was doped with aluminum. However, the role of ZnS and Al-doped ZnS in DSSC is lack of knowledge. Herein, we studied the effect of ZnS and Al-doped ZnS in TiO_2 photoanode using a simplest preparation. The thin film was prepared by doctor blade technique using a mixture of TiO_2 paste with ZnS and ZnS:Al. Structural property and the relevance of each elements in all anode thin films was characterized by means of X-ray diffraction. The Ru-based dye, N719 was used for semiconductor sensitization. The absorption and photoluminescence of TiO_2 /N719 ,TiO_2∶ZnS/N719 , TiO_2∶ZnS:Al/N719 photoanodes were investigated. Then the role of ZnS and Al-doped ZnS in dye sensitized TiO_2 photoanode is discussed. Speaker: Ms. Kamonchanok Wangcharoen (Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang, Pathum-Thani, Thailand) • 15:45 Optical properties of DC sputtered titanium dioxide/gold thin films 15m Titanium dioxide (TiO_2) thin films have been generally accepted as an important material in the fields of photocatalysis, photovoltaic and photochromic. The efficiency of TiO_2 films as an active layer in various applications strongly depends on their optical properties. In this present study, the optical properties of sputtered TiO_2 thin films were modified using nanoparticles gold (Au) underlayer. TiO_2 thin films with 100 nm thickness were prepared by DC magnetron sputtering on gold-coated glass substrate with the estimated thickness approximately 2, 6 and 10 nm. The deposited TiO_2/Au films were characterized using UV-Vis spectroscopy and photoluminescence (PL) spectroscopy. The transmittance of TiO_2/Au film in the visible region decreased from 87% to 50% when thickness of gold underlayer increased from 0 to about 10 nm. In addition, energy gap of TiO_2/Au film from Tauc’s plot decreased with the increase of the thickness of gold underlayer while the wavelengths of peak emission spectra obtained from PL were found to be increased. The modified optical properties indicated the probability of light absorption which leaded to the increase in electron-hole pair generation in this composite film. Speaker: Mr. Manas Sittishoktram (Department of Physic, Faculty of Science, King Mongkut’s University of Technology Thonburi) • 15:45 Optical tristability Investigation in Two Coupled Ring Resonators 15m The microring resonators have potential applications for the photonic integrated circuits. The dynamical phenomena of the two coupled microrings require a simple and efficient numerical formalism for solution of the system. We present a simplified theory of the optical tristability inside the two coupled microrings that take into account Kerr nonlinearity and the effect of loss. We also compare the analytical results with the results from 3D finite-difference time-domain simulation. Besides, we show it is possible to obtain configurations which can tune the tristable region. This could be useful for designing optical logic applications. Speaker: Dr. Santhad Pithakwongsaporn • 15:45 Optimization of Copper Surface as a Substrate for CVD growth of Graphene 15m Copper (Cu) foil substrate is the most widely used as a substrate for graphene growth by chemical vapor deposition (CVD). It is known that the suitable morphology and crystal orientation of Cu foil substrate, which are crystal plane of Cu (111), low roughness and large grain size, are required for the growth of good film uniformity of graphene. The purpose is to investigate the evolution of surface morphology and crystal orientation of Cu foil substrate, after various chemical treatment and annealing at high temperatures (800 – 1000^oC). Before a real growth of grapheme, we firstly focus on a preparation the Cu foil substrate by pretreatment in hydrochloric acid (HCl) and electro-polishing in phosphoric acid (H_3PO_4) in order to removing impurities on Cu foil surface. To increase the grain size of the (111) domains on the Cu foil substrate, after chemical cleaning process, the Cu foil substrates were annealed under nitrogen gas atmosphere. Scanning electron microscopy (SEM), optical microscopy (OM), atomic force microscopy (AFM) and x-ray diffraction spectroscopy (XRD) were utilized to investigate surface morphology and crystal orientation of the Cu foil substrate, that need to be optimized for the CVD growth of graphene. OM, SEM and AFM images illustrated an improvement surface of Cu foil substrates after pretreatment in HCl with the optimized concentration of 37% and etching time of 40 s. The conditions of electro-polishing was adjusted to be 50% H_3PO_4, voltage of 10 V, and polishing time of 60 s for achieving the smoothest Cu foil substrate surface. Furthermore, the strongest X-ray diffraction intensity ratio between the (111) reflection to other reflections, such as (200), (220) and (311) reflections, was observed for the Cu foil substrate annealed at 920 ^oC and 2 mbar for 5 min. In addition, heat increasing rate, cooling rate and N_2 flow rate were 1 ^oC /s, 5 ^oC /s and 20 sccm, respectively. Graphene growth and its characterization results will discussed during presentation. Speaker: Taworn Intaro • 15:45 Performance of ZnO-doped recycled window glass as a thermoluminescence dosimeter 15m Thermoluminescence properties of Thai commercial window glass provided by Guardian Industries Corporation (denoted as WG) were studied. WG was doped with varying concentrations of ZnO The composition of glass is 90WG-10Na2O-xZnO (where x = 0.000, 0.001, 0.010, 0.100, 1.000 mol%). Glass samples were recycled by using melt quenching technique and cut into the dimensions of 6×6×1 mm3. After irradiated glass samples with X-ray at photon energy 160 keV in absorb dose rang 0-14 mGy, the glow curve structure, TL sensitivity, linearity and minimum detectable were investigated. Speaker: Ms. Thanaporn Thumsa-ard (Ubon Ratchathani University) • 15:45 Permeation of Beta Cyclodextrin and its Derivatives into the Lipid Membrane 15m Beta cyclodextrin (βCD) and its derivatives such as methylated βCD (MEβCD) and hydroxypropyl βCD (HPβCD) have been widely used to improve the solubility and the stability of poor water soluble drugs. Most drugs are completely bound inside the hydrophobic cavity interior of the βCDs. In the present work, we studied the pre-step of drugs releasing based on drug-βCDs complexes. The interaction of three different types of βCDs i.e. βCD, 2,6-DMβCD and 2,6-HPβCD) with phospholipid bilayer was investigated using molecular dynamics (MD) simulations. The influence of chemical function groups and the orientation of βCDs interacting with bilayer surface on βCDs' permeation was studied. Our results showed that all βCDs passively adsorbed on the POPC bilayer surface via hydrogen bonding with different permeation depth and orientation. The order of permeation depth of βCDs was βCD > 2,6-DMβCD > 2,6-HPBCD. The βCD was permeated deeper when interacting with lipid bilayer by facing its secondary rim toward the bilayer's center. In contrary, the 2,6-DMβCD and 2,6-HPβCD adsorbed into the deeper part with turning its primary rim toward the bilayer's center. The molecular details of the interactions of βCDs and phospholipids are helpful to the selection of the appropriate βCDs in the pharmaceutical applications. Speakers: Ms. Wasinee Khuntawee (Department of Physics, Faculty of Science, Kasetsart University, Bangkok) , Ms. Pornkamon Nalakarn (Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand ) • 15:45 Preparation of aluminum doped zinc oxide thin films on glass substrate by sparking process and their optical and electrical properties 15m Aluminum doped Zinc Oxide (AZO) nanoparticle thin films were deposited on glass substrates by double tips sparking process which is a simple, low cost method and can be done at room temperature. The effect of Al doped ZnO was studied in order to improve electrical and optical transmittance properties. The doping ratios of Al into ZnO were controlled by different sparking power using different capacitor paralleled Al doping tips and were investigated by EDS. The surface morphologies and cross-section images were observed by scanning electron microscope (SEM). The thickness of the films was approximately 600-900 nm. The EDS results showed that Al content into ZnO increased when the capacitance paralleled Al tips increasing. The Al doping ratios were 3, 5, 7, 13 and 22 at.% when capacitances paralleled Zn : Al tips were 40:0.5, 40:1.1, 40:1.5, 40:3.1 and 40:4.7 nF, respectively. SEM images indicated agglomerated particle size increased after annealing treatment. The crystalline structure was characterized by X-ray diffraction and Raman spectroscopy. UV-Vis spectroscopy was used to measure the optical properties. The optical transmittance spectra of the AZO thin film exhibited greater than 50 % in the visible region. Also, their electrical properties were measured by Van Der Pauw technique for transparent conducting oxide glass application. Speaker: Mr. Anupong Sukee • 15:45 Preparation of strontium- and/or zinc-doped hydroxyapatite nanoparticles and their polycaprolactone composite fibrous scaffolds 15m In this work, hydroxyapatite (HA) and hydroxyapatite doped with Sr (HA-Sr), Zn (HA-Zn) and both Sr-Zn (HA-SrZn) were synthesized by a sol-gel method and combined with polycaprolactone (PCL) to make HA/PCL composites using an electrospinning technique. The synthesized nanoparticles and their composite fibers were investigated using various techniques. The X-Ray Diffraction (XRD) result showed the characteristic peaks of the hydroxyapatite structure; whereas the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results revealed that the synthesized nanoparticles were successfully incorporated into the randomly interconnected and highly porous PCL matrix. Speaker: Mr. Teeranat Pantasri (Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand) • 15:45 Quantum reflection in the linearly downward potential 15m In this work, the motion of a particle in one dimension, under the influence of the potential well that is modeled as the linear downward of length L with a finite depth |V_{0}|, is studied within the context of the non-relativistic quantum mechanics. The attention is paid on the paradoxical phenomenon of the reflection of a particle that is in contrast between classical and quantum physics. Classically, the reflection effect occurs only at a potential barrier. To demonstrate such counterintuitive phenomenon, the Schr\ddot{\rm{o}}dinger equation is solved to obtain the reflection coefficient in the scattering state by considering an incident particle with an energy E>0, that is represented by a monochromatic plane wave, propagates freely from left to right, pass through the potential well. The continuity conditions at boundaries give the desired result that is expressed in terms of the Airy functions which depends on the incident energy E, the strength |V_{0}| and the range L of the well. The value of the reflection coefficient R lies in the interval 0\leq R<1, and its behavior is the decreasing function with respect to the range L. Speakers: Mr. Noppasin Chamnan (Burapha University) , Dr. Boonlit Krunavakarn (Burapha Univesity) • 15:45 Selected Screen for Engaging Students in Projectile Motion 15m Connecting physics concepts with that interest activities or with activities that interest. Thought will allow students strong to build a foundation. When an event of interest to the students, it will contribute to the students' responses, engaged and enthusiasm for learning. Learning activities resulting from things that interest and have found on a regular basis can have a lasting and memorable. Both can help enhance the learning experiences of students. One such activity that can be described in this paper, the learning activity through a film as an application of basic projectile motion. So that students understand the nature of the motions. There is also aimed to develop critical thinking skills of the students. Speaker: Mr. Ar-si Dramae (Department of Physics Faculty of Science , Ubon Ratchathani University) • 15:45 Selective area growth behavior of ZnO nanorod arrays in hydrothermal synthesis 15m ZnO nanorod arrays have become to attract much attention because the uniform and symmetry of ZnO nanorods can provide great optical and electrical potential in many nanodevices. Here, we have controlled nucleation sites using electron beam lithography technique and grown ZnO nanorods via hydrothermal synthesis to observe growth behaviors. We have measured diameter of nanorods and density of each aperture area. The results presented that the aperture size and distance between adjacent apertures strongly affected the growth of ZnO nanorods such as nucleation layer and growth rate. There is no nanorod grown on the aperture area when aperture size is large and distance between apertures is small. On the other hand, there are several nanorods grown through large aperture size with large distance between apertures. These phenomena show the growth behavior of ZnO nanorods corresponding to the different aperture sizes and distances. This is very useful to enhance the properties of ZnO nanorods and also can achieve high performance of nanodevices. Speaker: Nantarat Srisuai • 15:45 Simple Harmonics Motion experiment based on LabVIEW interface with Arduino 15m In this work, we developed an innovative physics lab apparatus that is modern, cheap and simple. The ultrasonic sensor was used to measure the position of a mass attached on a spring as a function of time. The data acquisition system and control device were developed based on LabVIEW interface with Arduino. The experimental was designed to explain the simple harmonics motion similar to the wave propagation. The simple harmonic system (mass and spring) was observed and the motion can be realized using curve fitting to the wave equation in Mathematica. We found that the spring constants provided by Hook’s law and the wave equation fitting are in good agreement. Speakers: Dr. Anusorn Tong-on (Chiang Rai Rajabhat University) , Parinya Saphet (CRRU) , Dr. Meechai Thepnurat (Chiang Rai Rajabhat University) • 15:45 Simulations of induced transmembrane potentials of tilapia’s egg using Hen egg RC-model 15m The present study proposes another alternative approach to model the geometry of Nile tilapia egg for evaluation of the induced transmembrane potential. The actual shape of tilapia egg is an asymmetrical prolate spheroid with a short prolate spheroid bottom and a more elongate prolate spheroid at the top with a common equator rather than a symmetrical prolate spheroid. Unfortunately, the precise model of such non-spherical bioparticle does not exist as yet. In the past, the closest available model was as a shelled symmetrical prolate-spheroid which gave the large error to calculate transmembrane potential. This work proposes the complete “hen egg RC-model” to analyze the implicit value of electrical breakdown transmembrane potential. The two semi-minor axes are set to equal one another. The ratio between the semi-major and semi-minor axes is 1.0-1.5. We keep the volume of the egg constant throughout our analysis which is equivalent to that of the “hen-egg model” possessing the effective values of the semi-major and the semi-minor axes so that the polarization of the egg can be assumed to be the same over the whole egg volume. In the case of the egg possessing a single dielectric shell, it was also analyzed as the equivalent tri-phases of RC-circuit using three pairs of resistors and capacitors to represent the conductive and capacitive properties of the egg’s shell, the inner part of the egg and the suspending medium, respectively. The complex specific impedances of each compartment and induced transmembrane potentials of tilapia’s egg were finally analyzed. Speaker: Prof. Dr.Sakshin Bunthawin (Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus ) • 15:45 Single-mirror, off-axis schlieren system’s sensitivity determination 15m Schlieren photography is a technique used to visualize density gradient of fluid medium, which is due to a linear relationship between fluid density and refractive indices. In this study, a single mirror off-axis schlieren system was employed to observe minimum temperature difference between room and heated object, vacuum flask.The tracker program was used in measuring relative light intensities. It was found that the minimum difference temperature observed was 0.9 ^oC.The theoretical minimum air density gradient is 0.128 kg/m^4, while the observed one is 2.98 kg/m^4. When using fluid dynamics computer simulation, the location where the light intensity data was acquired, the air density gradient was 0.0682 kg/m^4. Speaker: Mr. Kittisak Ketaiam (Yupparaj Wittayalai School) • 15:45 Stability and Electronic property of Vacancy Defects in Silicon Carbide Nanosheet based on DFTB 15m Silicon Carbide (SiC) is the chemical compound of carbon and silicon. Recognized as a perfect semiconductor with superior characteristics, SiC is widely used in high-temperature, high-power, and high-frequency electronic applications. Defects in a semiconductor have become a primary important issue since they can damage and change the unwanted electrical properties. The study of geometric and electronic properties of the defects in SiC nanosheet is crucial to understand the effects on an electronic device. In this research, we present a study of the energy gap and formation energy of the defective SiC nanosheet (Si_1$$_4$$_4C_1$$_4$$_4) based on self – consistent charge density functional based tight binding (SCC- DFTB) method including van der Waals dispersion corrections. The geometric and electronic properties of defective SiC nanosheet related to the number of vacancy defects in SiC nanosheet have been studied systematically. The defective SiC nanosheet was made by removing Si atoms and C atoms around the central region of SiC nanosheet. The energy gap of pristine SiC nanosheet exhibited 1.060 eV. The energy gap of defect SiC nanosheets were in range of 0.049 to 0.811 eV when Si atoms were removed more than C atoms and 0.028 to 0.753 eV in case of the same rate of removal Si atoms and C atoms. However, when Si atoms were removed less than C atoms, the energy gap showed the less of 0.005 to 0.482 eV. The stability of the SiC nanosheet was investigated by using the calculated normalized formation energies. By increasing vacancy atoms, the defect stability has produced an identical result which is a decline from 75.321 to 87.453 eV. On the other hand, the defect stability has increased (67.722 to 75.504 eV) when vacancy atoms are added to the SiC nanosheet by removing Si atoms less than C atoms. The highest formation energy (87.453 eV) has been found after one single C atom vacancy defect was withdrawn from SiC nanosheet (Si_1$$_4$$_4C_1$$_4$$_3) while the lowest formation energy was 67.722 eV when one Si atom was removed (Si_1$$_4$$_3C_1$$_4$$_4). We have found that the ratio between the number of silicon atoms and the number of carbon atoms is of the great importance to the stability and electronic properties of the vacancy defect in SiC nanosheet. Speaker: Ms. Onsuda Arayawut (Department of Physics, Faculty of Science, Kasetsart University, Thailand) • 15:45 Stoichiometry and Performance in PCDTBT:Perylene Solar Cells 15m Stoichiometry and Performance in PCDTBT:Perylene Solar Cells Wannakan Sathongsang1, Kanyaporn Thubthong1, Pisist Kumnorkaew2, Vinich Promarak3, and Yingyot Infahsaeng1* 1Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang Pathum-Thani, Thailand 2National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, Thailand 3Vidyasirimedhi Institute of Science and Technology, School of Molecular Science and Energy, Wangchan, Rayong, Thailand *E-mail: yingyot.infahsaeng@gmail.com Abstract The bulk heterojunction solar cell has been developed for many decades. The electron acceptor is one of the key performance in this solar cells, typically using fullerene derivatives. However, the free fullerene solar cell has been proposed using difference acceptor molecule. Herein, the morphology in bulk heterojunction PCDTBT:Perylene thin films of varied stoichiometry (1:1, 1:2 and 1:4 PCDTBT:Perylene) and PCDTBT:PC70BM thin films is investigated and compared using Atomic Force Microscopy (AFM). PC70BM and a novel Perylene are electron acceptor and transporting molecules in polymer based solar cells. This Perylene derivative have been firstly used as electron acceptor in solar cells. The optical and energetic properties of perylene suggest that this molecule may be a good candidate for electron acceptor. The solar cell performance of varied electron acceptor and stoichiometry is reported and correlated with the morphology of thin films. Keywords: polymer solar cells, perylene, stoichiometry, bulk heterojunction Speaker: Ms. Sathongsang Wannakan • 15:45 Stoichiometry and Performance in PCDTBT:Perylene Solar Cells 15m The bulk heterojunction solar cell has been developed for many decades. The electron acceptor is one of the key performance in this solar cells, typically using fullerene derivatives. However, the free fullerene solar cell has been proposed using difference acceptor molecule. Herein, the morphology in bulk heterojunction PCDTBT:Perylene thin films of varied stoichiometry (1:1, 1:2 and 1:4 PCDTBT:Perylene) and PCDTBT:PC70BM thin films is investigated and compared using Atomic Force Microscopy (AFM). PC70BM and a novel Perylene are electron acceptor and transporting molecules in polymer based solar cells. This Perylene derivative have been firstly used as electron acceptor in solar cells. The optical and energetic properties of perylene suggest that this molecule may be a good candidate for electron acceptor. The solar cell performance of varied electron acceptor and stoichiometry is reported and correlated with the morphology of thin films. Speakers: Ms. Wannakan Sathongsang (Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang Pathum-Thani, Thailand) , Ms. Kanyaporn Thubthong (Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang Pathum-Thani, Thailand) • 15:45 Stretchable strain sensor based on metal nanoparticles-Polydimethylsiloxane nanocomposites 15m The preparation of nanocomposites materials by using Polydimethylsiloxane (PDMS) with metal nanoparticles (gold and silver) and metal oxide nanoparticles (Zinc oxide and Titanium dioxide). Then, Characterization of the films was carried out by atomic force microscope (AFM) and fourier transform infrared spectroscopy (FTIR) after that the film creates to the electrodes on the film for applying an strain measurement devices. The maximum current output increased as a result of the metal nanoparticle that composites with an improved electrical conductivity of PDMS strain sensor. Speaker: Dr. Thutiyaporn Thiwawong (College of Nanotechnology) • 15:45 Study Motion of PVC-Cylindrical on Incline Plane using g-Sensor Compare with Motion Simulate 15m The g-sensor with a wireless, using to study motion of hollow PVC-cylindrical on incline plane.This sensor will packed inside PVC-cylindrical. For experimental,We drop the PVC-cylindrical on the top of incline plane length 1.2 m.By changed high of plane at 3.5, 4.5, 5, 5.5, 6 and 6.5 cm relate to angle 0.0318, 0.0409, 0.0454, 0.0499, 0.0545 and 0.0590 rad respectively. The signal from the sensor will send pass wireless to computer and show in hyper-terminal. The data will be compare with simulate signal to determine speed and angular speed various with time.For result data at high 3.5, 4.5, 5, 5.5, 6 and 6.5 cm compare with simulate data motion has error are 3.12%, 3.89%, 4.71%, 6.28%, 9.36% and 18.20% respective. From experiment, we can find limit of this sensor for this experiment at high 8 cm.Because clock frequency limit of sensor. Speaker: Mr. Dusit Ngamrungroj (KMUTNB) • 15:45 Study of formaldehyde molecule adsorption on pristine, defect and functionalized carbon nanotubes by self-consistent charge density functional tight-binding method 15m We aim to fabricate formaldehyde gas sensors for identifying formalin contamination of fresh raw food materials, especially seafood. Carbon nanotubes (CNTs) are one of materials widely used for fabrication of gas sensors because of their unique electronic properties. Unfortunately, pristine CNTs exhibit very low sensitivity for formaldehyde molecule adsorption. In this research, we have used self-consistent charge density functional tight-binding (SCC-DFTB) method to model the various CNTs including pristine, defect and N2 functionalization for finding the best structure for formaldehyde sensing. Pristine CNTs (9,0) containing 180 carbon atoms were built and their two ends were capped with hydrogen atoms to avoid the boundary effects. Then, the CNTs were made a vacancy defect and functionalized by N2 molecules. Interaction between a CNTs surface and formaldehyde molecule was investigated. Total energy of interaction was calculated. The primary results showed the total energy of pristine, defected and N2 functionalized CNTs was 0.13, 0.14 and 0.21 eV, respectively. The functionalization on CNT surfaces with N2 molecules improved a better interaction between formaldehyde molecules and CNTs. Speaker: Mr. Kriengkri Timsorn (Department of Physics, Faculty of Science, Kasetsart University, Chatuchak Bangkok, 10900, Thailand) • 15:45 Study of the efficiency calibrations of HPGe detector for the PGNAA system 15m One of the most important part of the Prompt Gamma Neutron Activation Analysis system (PGNAA) is the High Purity Germanium detector (HPGe). In this paper, the calibrations of an HPGe detector were made with the isotopic source ^{152}Eu. The same detector was modelled in the MCNP5 and simulated. The thickness of the dead layer was determined. The simulated and experimental efficiency over the energy range of the ^{152}Eu are compared observing a satisfactory agreement. Speaker: Mr. Wichian Ratanatongchai (Thailand Institute of Nuclear Technology (Public Organization)) • 15:45 Study of tilapia’s egg permeabilization with the optimized electrical parameters 15m On the basis of electrical induction of eggs for sex reversal, the egg membrane exposed to a very short high-intensity electric field pulses can be temporarily permeable in specific regions of the egg. During the destabilization period, the membrane is highly permeable to exogeneous molecules present in the surrounding medium. Optimization of protocols has led to a situation where high egg viability can be combined with high percentages of egg permeabilization and hormone transfection. The present study achieved to have over 90% of eggs permeabilized with less than 5% egg death. Conditions traditionally used to achieve this are 1-5 square pulses of 50-1,000 micro-second duration using electric field strengths 0.25-87.50 kV/m. Some issues that might be concerned when performing in vitro electroporation were taken into account. Optimization for each egg clutch is necessary. A good result increases with homogeneity in egg size and conversely that for egg with very large variations in egg size. Eggs size of the semi-major axis of 1.5 mm and semi-minor axis 1.0 mm were selected for electrical inductions throughout this work. Speaker: Prof. Dr.Sakshin Bunthawin (Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus ) • 15:45 Study on Inverse Laplace Transform of NMR relaxation signal of Sticky rice. 15m In this study, the composition of sticky rice was studied using NMR relaxometry. Because the rice seeds have several elements, the NMR signal is multiexponential decay. However, its components that yield NMR signals can be separated by using Inverse Laplace Transform method. This method is data analyze by from least squares algorithms. The Downhill Simplex method was used to find the variable values faster. Numerical results of signals analysis are comprised of discrete spectrum of T_1 and T_2. These spectrums of sticky rice samples are shown separation of the peak composition. In this work the resulting spectrum has two peaks, each peak has a value of T_2 is 0.31 and 1.29 ms, respectively. Speaker: Mr. Nattawoot Maleelai (Khon Kaen University) • 15:45 Surface study of irradiated sapphires using AFM 15m The irradiation is one of the gemstone enhancements for improving the gem quality. Typically, there are many varieties of irradiated gemstones in the gem market such as diamond, topaz, and sapphire. However, it is hard to identify the gemstones before and after irradiation. The aim of this study is to analyze the surface morphology for classifying the pre- and post- irradiated sapphires using atomic force microscope (AFM). In this study, the sapphire samples were collected from Thailand and Sri Lanka based on their different geological origins. The samples were irradiated by high energy electron beam for a dose of ionizing radiation at 40,000 kGy. As the results, the surface morphologies of unirradiated sapphires show regular atomic arrangement, whereas, those of irradiated sapphires show the nano-channel observed by the 2D and 3D AFM images. The atomic step height and root mean square roughness have changed after irradiation due to the micro-structural defect on the sapphire surface. Therefore, this study is the frontier application for sapphire identification before and after irradiation. Speaker: Natthapong Monarumit • 15:45 SYNTHESIS OF CaCu_3Ti_4O_1$$_2$ BY MODIFIED SOL-GEL METHOD WITH HYDROTHERMAL 15m

In this work, CaCu$_3$Ti$_4$$_-$$_x$(Nb$_1$$_/$$_2$In$_1$$_/$$_2$)$_x$O$_1$$_2 ceramics with x = 0, 0.025, 0.05, 0.10, and 0.20 were prepared by a conventional solid state reaction method. Changes in crystal structure, microstructure, dielectric, and electrical properties were systematically investigated. The main phase of CaCu_3Ti_4O_1$$_2$ ceramic was clearly observed in all the samples. The average grain size of CaCu$_3$Ti$_4$O$_1$$_2 decreased by (Nb^5$$^+$+In$^3$$^+) doping. The dielectric permittivity of CaCu_3Ti_4$$_-$$_x(Nb_1$$_/$$_2In_1$$_/$$_2)_xO_1$$_2$ ceramics was slightly dependent on frequency as co-doping concentration increased, which was due to a decrease in grain size. Dielectric behavior can be well described by the internal barrier layer capacitor (IBLC) model based on the interfacial polarization at grain boundaries. By using an impedance spectroscopy analysis at various temperatures, it was found that the grain boundary resistance and potential barrier height at the grain boundary of CaCu$_3$Ti$_4$O$_1$$_2 were reduced by co‒doping with (Nb^5$$^+$+In$^3$$^+) ions, resulting in an enhancement of dc conductivity and the related dielectric loss tangent. Speaker: Mr. Jakkree Boonlakhorn (Khon Kaen University) • 14:30 Characterization and Electrochemical Properties of Cu_2P_2O_7 Nanoparticles Prepared by Hydrothermal Method 15m Copper phosphate (Cu_2P_2O_7) nanostructures were synthesized by hydrothermal method. The precursor products were calcined at 500, 600 and 700 oC in air for 3 h. Thermogravimetric/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) were used to study the phase formation, crystalline structure, morphology and functional group of samples. Electrochemical properties were measured by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). XRD analysis conﬁrms a monoclinic crystal structure of Cu_2P_2O_7 with space group C2/c. SEM micrographs of calcined samples show a fused grain structure for smaller crystals with more porous and rough surfaces. The CV results show the redox peaks in all curves, exhibiting reversible electron-transfer for Faradaic redox reactions with the largest CV areas for sample calcined at 600°C. The Cu_2P_2O_7 positive electrodes show a maximum high specific capacitance. In addition, the result of the electron-active sites participated in the Faradaic redox reaction indicat a valence interchange or charge hopping of cations Speaker: Mr. Attaphol Karaphun (Khon Kaen University) • 14:45 Hydrothermal synthesis and characterization of hyperbranched BiVO_4 microstructure and its applications 15m Bismuth vanadate (BiVO_4) microstructures were successfully synthesized by a hydrothermal method at 200 °c for 24 h. The phases and morphologies of the products were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and photoluminescence (PL) spectroscopy. BiVO_4 microstructures were self-assembled from bismuth nitrate and ammonium vanadate solutions by controlling pH of the precursor solutions without adding surfactant. The XRD results show that the products were pure monoclinic BiVO_4 phase at the pH 1. At pH 1 and 2, the morphologies of the products were hyperbranched and spherical microstructure, respectively. The PL spectra were determined by an excitation wavelength of 275 nm. They showed the similar peaks at 420 nm (2.95 eV) and 365 nm (3.40 eV) for those of the products synthesized at the pH 1-2. In addition, the anti-bacterial properties of the as-synthesized BiVO_4 were investigated. The result shows that BiVO_4 synthesized at the pH 1 can play the role in inhibiting of S. aureus (3.5×10-5 CFU) more than E. Coli (a large number of counts). Speaker: Dr. Nuengruethai Ekthammathat (Program of Chemistry, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University) • 13:20 15:05 A14: Environment Ballroom 3 () ### Ballroom 3 Conveners: Prof. Weeraphat Pon-on (Department of Physics, Kasetsart University) , Prof. Chatchawal Wongchoosuk (Kasetsart University) • 13:20 effect of chemical composite, puffing temperature and moisture content on physical properties of puffed apple and potato 15m Puffing technique is the process that can improve physical properties of fruit and vegetable. However, the effect of chemical composite in foods on puffing characteristics is still lack of study. Therefore, potato and apple slices were comparative study on physical properties. Potato and apple were sliced into 2.5 mm thickness and 2.5 cm in diameter. Potato slices were treated by hot water blanching for 2 min while apple slices was not treatment. After that, they were dried in 3 steps. First step, they were dried by hot air at temperature of 90C until their moisture content reached to 30, 40, and 50 % dry basis. Then they were puffed by hot air at temperature of 130, 150, and 170C for 2 min. Finally, they were dried again by hot air at temperature of 90C until their final moisture content reached to 4% dry basis. The experimental results showed that chemical composite of food affected on physical properties of puffed product. Puffed potato had higher volume ratio than those puffed apple because potato slices contains starch that could be generated sealed surface layer and therefore it potentially escape vapor during puffing. The higher starch content provided more hard texture and higher initial slope of potato than those apple. Puffing temperature and moisture content strongly affected on color, volume ratio, and textural properties of puffed potato slices. Increasing of puffing temperature and intermediate moisture content induced higher volume ratio and then lower hard texture. In addition, increasing of puffing temperature and moisture content provided higher drying rate of puffed product. Speaker: Mr. Surapit Tabtiang • 13:35 Observation of Cosmic Ray Variation with Atmospheric Water Vapor at Doi Inthanon 15m Neutron monitor (NM) and Bare (lead-free) neutron counters are ground-based detectors to detect the variation of intensity in cosmic rays. In addition, the bare detector to neutron monitor count rate ratio (Bare/NM) provides information on the cosmic ray spectrum. In the present work, we utilized data from the Princess Sirindhorn Neutron Monitor station at Doi Inthanon, Thailand, with the world’s highest cutoff rigidity of 16.8 GV to observe variations in cosmic rays with time. We also found that variation in Bare/NM is strongly anti-correlated with surface atmospheric water vapor (Ew), with a nonlinear relationship.The water vapor pressure data can be inferred from the Global atmospheric Data Assimilation System (GDAS) and Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2). From these database we derive precipitable water vapor (PWV), i.e., the column density of water throughout the atmosphere. The results of comparison of PWV from the two database, from balloon data, and from GPS detectors in Chiang Mai Province will be discussed, and we will examine whether the Bare/NM count rate ratio at Doi Inthanon has a more linear relationship with PWV. Speaker: Pradiphat Muangha (Mahidol University) • 13:50 Non-chemistry coupled PM10 modeling in Chiang Mai City, Northern Thailand: A fast operational approach for aerosol forecasts 15m An optimum cumulus parameterization scheme was determined for the Weather Research and Forecasting (WRF) model for Northern Thailand. This was then applied to model PM10 data in Chiang Mai city for 10-days during a high haze event using an updated WRF version (v. 3.7) and updated land use categories from the Moderate Resolution Imaging Spectroradiometer (MODIS). A higher resolution meteorological lateral boundary condition (from 1 degree to 0.25 degree) was also used from the NCEP GDAS/FNL Global Tropospheric Analyses and Forecast Grid system. A 3-category urban canopy model was also added and the Thompson aerosol-aware microphysics parameterization scheme was used to model the aerosol number concentrations that were later converted to PM10 concentrations. Aerosol number concentration monthly climatology was firstly used as initial and lateral boundary conditions to model PM10. However, this could not capture the variability, underestimated the high PM10 spikes and overestimated low PM10 values (R = 0.29) during the period studied when compared to surface data obtained from the Pollution Control Department (PCD). The authors then added satellite data to the aerosol climatology that improved the comparison with observations (R = 0.45). The authors then tried to use the ERA-Interim meteorological lateral boundary conditions to model the PM10. This captured the variability better (R = 0.4830) and the low PM10 concentrations. However, this setup underestimated the high PM10 spikes. In all cases, the simulations were not able to model one high PM10 spike. This is due to a local emission source that the meteorology, aerosol climatology and satellite data failed to pick up as proven by adding a hypothetical source upstream of the measurement site. Speaker: Dr. Ronald Macatangay (National Astronomical Research Institute of Thailand) • 14:05 Drying of paddy rice by using two series of screw conveyor dryer 15m Two series screw conveyor dryer potentially dries agricultural product especially paddy rice. However, the effect of screw speed, drying temperature and drying cycle on decreased moisture content and energy efficiency is non-previous literatures. In this study, the paddy rice was carried into dryer at 4.8 kg/batch under screw speed 35, 50 and 75 rpm and drying temperature of 50, 70 and 90°C. The results showed that drying temperature and screw speed affected on decreased moisture content and specific energy consumption (SEC). Increasing of drying temperature provided higher amount of moisture content loss. However, the lower screw speed could be increased amount of moisture content loss because lower screw speed increased retention time of paddy rice in drying chamber. In addition, the amount of moisture content loss in the first drying cycle had higher than those second drying cycle then the first drying cycle had higher SEC than second cycle. In addition, the SEC decreased as lower drying temperature and lower crew speed. Speaker: Mr. Aswin Yodruk • 14:20 Comparison of spectral ultraviolet irradiance measured from ground-based and satellite instruments at Nakhon Pathom province 15m In this study, comparison of spectral ultraviolet irradiance at 305, 310, 324 and 380 nm at satellite overpass time retrieved from OMI/AURA satellite with that from ground-based measurement was performed at Nakhon Pathom (13.82 N, 100.04 E), Thailand. The analyzed data period comprises from 1 January 2010 to 31 December 2015. The comparison results clearly show the overestimation of satellite data with root mean square difference (RMSD) between 22.9 and 48.9% and mean bias difference (MBD) between 5.3 and 39.8% for all sky conditions, and reduce to 10.6-40.5% and 0.18-34.9% for clear sky conditions. Further results show that the differences between the two data sets depend on atmospheric aerosol loads and clouds. Speaker: Ms. Juthatip Sriwongsa (Laboratory of Tropical Atmospheric Physics, Department of Physics, Faculty of Science, Silpakorn University) • 14:35 An investigation of cloud base height in Chiang Mai 15m Clouds play very important role in the variation of surface solar radiation and rain formation. To understand this role, it is necessary to know the physical and geometrical of properties of cloud. However, clouds vary with location and time, which lead to a difficulty to obtain their properties. In this work, a ceilometer was installed at a station of the Royal Rainmaking and Agricultural Aviation Department in Chiang Mai (17.80 N, 98.43 E) in order to measure cloud base height. The cloud base height data from this instrument were compared with those obtained from LiDAR, a more sophisticated instrument installed at the same site. It was found that the cloud base height from both instruments were in reasonable agreement, with root mean square difference (RMSD) and mean bias difference (MBD) of 19.21% and 1.58%, respectively. Afterward, a six-month period (August, 2016-January, 2017) of data from the ceilometer was analyzed. The results show that mean cloud base height during this period is 1.5 km, meaning that most clouds are in the category of low-level cloud. Speaker: Ms. Sahussa Peengam (Laboratory of Tropical Atmospheric Physics, Department of Physics, Faculty of Science, Silpakorn University) • 13:30 15:05 ThEP Sync room () ### Sync room ThEP meeting • 15:05 15:20 Coffee break 15m • 15:20 16:50 A15: Atomics Ballroom 1 () ### Ballroom 1 Conveners: Sutee Boonchui (Department of Physics, Kasetsart University) , Bumned Soodchomshom • 15:20 Generation of spiral waves pinned to obstacles in a simulated excitable system 15m The dynamics of pinned spiral waves, whose tips trace the boundary of obstacles, are of interest due to the impact on human health. In heart, such pinned waves cause longer lifetime tachycardia. In this article, we present two methods for generating pinned spiral waves in a simulated excitable system. In method A, an obstacle is set in the system prior to an ignition of a spiral wave. This method may be suitable only for the case of large obstacles since it often fails when used for small obstacles. In Method B, a spiral wave is generated before an obstacle is placed at the spiral tip. With this method, a pinned spiral wave is always obtained, regardless the obstacle size. We demonstrate that after a transient the dynamics of the pinned spiral waves generated by the methods A and B are identical. Pinned spiral waves in both two- and three-dimensional systems are illustrated. Speaker: Ms. Metinee Phantu (department of physics, Kasetsart university) • 15:35 Effect of a modified sinusoidal forcing on spiral waves in a simulated reaction-diffusion system. 15m Spiral waves are often found in excitable media and they are abnormal forms of action potential propagation in the case of hearts. Under an external forcing, the spiral waves drift and are subsequently terminated at the boundary. Spiral waves can be studied in simulations using a discrete reaction-diffusion system, thereby the time step must be less than a numerical stability limit (ts). In this article, we present the dynamics of spiral waves in a simulated system under an external forcing as a modified sinusoidal function of time. An optimization of the time step provides the optimal time step of 0.2ts. The spiral waves under the sinusoidal forcing drift along a straight line with a velocity independent on the forcing period. In addition, these spiral waves drift faster than those under a constant forcing with a magnitude equal to the root-mean-square value of the time-varying forcing. Speaker: Ms. Kritsana Khaothong • 15:50 Investigation of transmission properties of a simple quantum Tesla valve 15m We investigate theoretically the transmission properties of a single atom passing through simple Tesla valve structures operated in a quantum mechanical regime. Our simple structure were made up of a few static equiangular triangles that allow a high and low transmission efficiency in one direction and not the other. Our best value of the extinction ratio, the ratio between forward and backward transmission, of the quantum valve exceeded 50. The variation of extinction ratio in both classical and quantum regime were compared and discussed over changes in geometrical arrangement inside the valve. Speakers: Mr. Jirayu Mongkolkiattichai , Mr. Sorawich Maichum • 16:05 Ab initio study on the effect of phenyl substitution on the binding of carbon dioxide to salcomine 15m Metal-organic complexes, such as metal-porphyrins, can function as homogeneous catalysts for electrochemical reduction. In this work we present ab initio electronic structure calculations for a reaction involving carbon dioxide and salcomine, a coordination complex consisting of a salen ligand and a cobalt (II) atom. Changes to the binding energy due to substitutions on the phenyl ring by different functional groups are also studied. Cases where a shrinking HOMO-LUMO gap decreases the overpotential and increases the catalytic efficiency of the complex are analyzed. This study provides a theoretical basis for possible salen complex candidates as electrocatalyst for the reduction of carbon dioxide. Speaker: Mr. Meliton Chiong III (Materials Science and Engineering Program, College of Science, University of the Philippines, Diliman, Quezon City, Philippines) • 16:20 Molecular dynamics study of the elastic properties of copper-silver alloys using embedded atom model potentials 15m The elastic properties of copper-silver alloy were determined for different atomic compositions by molecular dynamics simulations using an embedded atom model (EAM) potential. The elastic constants (c_{11}, c_{12}, c_{44}) that describe the Young’s modulus, bulk modulus, and shear modulus, were obtained from the stress-strain curves using strains applied at a constant rate. The temperature dependence of the elastic properties from 300K to 600K is also reported. Speaker: Mr. Jan Fronimarc Viloria (National Institute of Physics, University of the Philippines Diliman, Quezon City) • 16:35 Ionic effects on the DNA denaturation and DNA unzipping 15m The double-stranded DNA (dsDNA) that is separated and unwound changes its structure to the single-stranded DNA (ssDNA) in response either to the thermal energy or to the external forces. For the former the thermally induced dsDNA-to-ssDNA transition, called DNA denaturation, occurs in the polymer chain reactions. For the latter the force induced dsDNA-to-ssDNA transition, called DNA unzipping, separates two strands and opens a room for RNA polymerase to transcribe the sequence of base pairs. In DNA denaturation increasing the temperature higher than melting temperature, T > T_{m}, results in ssDNA. In DNA unzipping pulling the strands with the force stronger than critical force, F > F_{c}, also results in ssDNA. In the temperature-force phase diagram the critical force F_{c}(T) is a boundary between the low temperature, small force phase of dsDNA and the high temperature, large force phase of ssDNA. The Na^{+} concentration dependence of T_{m} and F_{c}(T) is studied by using the correspondence between the statistical mechanics and the time imaginary quantum mechanics. In the language of quantum mechanics the ssDNA emerges naturally as a delocalized state. Both melting temperature T_{m} and critical force F_{c}(T) are found to rise with increasing the Na^{+} concentration in qualitative agreement with the calorimetric experiments measuring T_{m} and the single molecule experiments measuring F_{c}. The enhancement of DNA stability in the presence of Na^{+} ions establishes a notion of the electrostatic stiffening. Speaker: Dr. Sitichoke Amnuanpol (Physics department, Thammasat University) • 15:20 17:00 A16: Magnetic and Semiconductor Ballroom 2 () ### Ballroom 2 Conveners: Adisak Boonchun , Dr. jiraroj T-thienprasert (Kasetsart University) • 15:20 Structural characterization of ferroic materials by advanced spectroscopy techniques 25m The Synchrotron-based X-Ray Absorption Near-edge Spectroscopy (XANES) and Polarized Neutron Reflectivity (PNR) techniques were employed to investigate the structural properties of BiFe_{1-x}Mn_{x}O_{3} ceramic and Co/CoO/Au multilayer, especially to study the local structure of Mn in BiFe_{1-x}Mn_{x}O_{3} ceramic and to verify the formation of secondary phase in Co/CoO/Au multilayer. Theoretical XANES spectra calculations corroborate with the interpretation of the XANES experimental data. In addition, the Co/CoO/Au multilayer was examined to explore the degree of recovery of the untrained state after the first two field cycles. Such a recovery was expected by field cycling a reorientation field (H_{RE }) along a direction of orientation angle (\Omega_{RE }) away from the initial field cooling direction. Measurements as a function of \Omega_{RE } and the strength of H_{RE } (along each direction) map the influence of \Omega_{RE } on the reversal mechanism in the layers and thereby the degree of recovery. Speaker: Prof. Rattikorn Yimnirun (School of Physics, Institute of Science and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand) • 15:45 Magnetic properties of RF-sputtered Co71Pd29 Film on Underlayers 15m RF-sputtered Co71Pd29 film with the thickness of 117 nm was deposited on glass and on Al, Co, Cr and Ni under-layers. Magnetic and electrical properties were measured by VSM and 4-point probe techniques. All prepared Co-Pd film showed ferromagnetic phase at room temperature. The Magnetic anisotropy of all films excluding on Ni under-layer tended to normal to film plane. The parallel magnetic sqaureness of 0.33, 0.26, 0.27, 0.34 and 0.4 was found in the film on Al, Co, Cr and Ni under-layers and on glass, respectively. The highest perpendicular magnetic squareness of about 0.52 was observed on the Co-Pd film on Cr under-layer whereas the lowest magnetic squarenss of about 0.18 was found in the film on Co under-layer. The electrical resistance of about 30, 20, 13, 45 and 35 Ω was found in the film on Al, Co, Cr and Ni under-layers and on glass, respectively. The results indicated that magnetic squareness tended to enhance whereas electrical resistance was decreased by under-layer insertion. Speaker: Ms. Suthasinee Somboonsap • 16:00 Response of Magnetic Force Microscopy Probes under AC Magnetic Field 15m In this paper, magnetic force microscopy (MFM) probes with different coating materials were characterized under AC magnetic field. A perpendicular magnetic write head similar to those used in hard disk drives was employed as the AC magnetic field generator. In order to measure a response of MFM probes to AC magnetic field, a MFM probe under test was scanned, at a scan height of 10 nm, across the surface of the magnetic write head. During MFM imaging, the write head was biased by a sufficient magnitude of AC current, approximately 30 mA. A spectral analysis for a frequency sweep from 1 kHz to 100 MHz was extracted from post-processing MFM images. As expected, a MFM probe coated with hard magnetic alloys, i.e. FePt, has the lowest response to AC magnetic fields. MFM probes coated with soft magnetic alloys, i.e. NiFe and NiCoCr, have a relatively high and flat response across the frequency range. In addition, CoCr, NiCo and pure Ni coated MFM probes show lower response than NiFe and NiCoCr probes at low frequencies; however, theirs response to AC magnetic field increase for the AC magnetic field with a frequency above 50 kHz. This can be implied that those MFM probes are a good candidate for being used to study the high-frequency performance of perpendicular magnetic write heads. Noting that response of all MFM probes significantly decreased when driven frequencies above 1 MHz due to the limitation of the hardware, i.e. response of quadrant photodiode and op-amp in a pre-amplifier. Keywords: MFM tips, MFM, magnetic write heads, frequency response Speaker: Ms. Adiwan Sungthong (Silpakorn University) • 16:15 Magnetic Force Microscopy Characterization of Perpendicular Magnetic Writers with Wrap-around Shield 15m Magnetic force microscopy (MFM) was employed to characterize the magnetic field distribution of two different designs of perpendicular magnetic writers with fully wrap-around shield (WAS). Typical magnetic write heads, located on a slider at the so-called air bearing surface (ABS), are composed of a magnetic write pole and a magnetic return pole. The write pole has a much small cross section area at the ABS than the return pole which is connected to magnetic shield. The write pole and the shield are separated by a non-magnetic gap layer. The shield structure is designed in such a way that it can confine the magnetic fields without significantly degrading field strength. In this work, MFM imaging was used to investigate the relationship between the gap structure and magnetic field strength/gradient. Magnetic field distributions of two different head designs were compared and discussed in detail. Experimental results revealed that the magnetic field intensity is linearly proportional to pole dimensions, especially the pole width. The field gradient, however, is dependent on not only spacing gap between shields and the write pole, but also the pole widths and thicknesses Keywords: magnetic field gradient, perpendicular magnetic recording heads, phase contrast MFM Speaker: Ms. butsaporn saelim (Silpakorn University) • 16:30 Structural, optical, electronic and magnetic properties of Fe-doped ZnO nanoparticles synthesized by combustion method and first-principles calculation 15m In this work, Zn_1$$_-$$_xFe_xO (x=0.000, 0.0625 and 0.125) materials have been investigated in both experimental and theoretical aspects. The pure and Fe-doped ZnO nanoparticles were prepared by a combustion method. The crystal structures were characterized using the X-ray diffraction (XRD), morphology by the transmission electron microscopy (TEM) techniques, magnetic behavior by vibrating sample magnetometer (VSM), and optical band gap by ultraviolet-visible (UV-Vis) spectroscopy. In first-principles calculation, density of states (DOS) and electronic band structure of the Zn_1$$_-$$_xFe_xO supercell have been calculated using general gradient approximation with Hubbard model scheme (GGA+U), packaged in the Vienna Ab initio Simulation Package (VASP). The calculation was performed using self-consistent projected augmented plane wave (PAW). From the study, the prepared nanoparticles of pure ZnO and 6.25 and 12.5% by mole of Fe-doped ZnO show different magnetic behavior from diamagnetism of ZnO. In the presence of the calculation results, the density of states of dopant systems shows state difference of spin up and spin down electron also an intermediate band, induced by d orbital of iron atoms, located near the valence band is observed. From these, it’s interesting that small amount of iron doping can engineer the band structure, and induce both intermediate band and magnetism in nonmagnetic ZnO material. Speaker: Ms. Pornsawan Sikam (Khon Kaen university) • 15:20 17:00 A17: Statistical and Theoretical Physics Ballroom 3 () ### Ballroom 3 Conveners: Prof. Surasak Chiangga (Department of Physics, Kasetsart University) , Dr. Papichaya Chaisakul (Kasetsart University and Université Paris-Sud) • 15:20 Applications of Fokker-Planck equations in liquid crystal physics and quantum optics 25m Fokker-Planck equations are partial differential equations that describe stochastic processes. Two applications will be discussed: liquid crystal physics and quantum optics. Liquid crystals can show different aggregate phases that can be used in commercial applications. These phases are self-organized equilibrium states and are characterized by order parameters such as the Maier-Saupe order parameter for nematic crystals. Using mean field theory, it is shown how the Fokker-Planck equation formalism can capture the self-organization character and the emergence of an order parameter. In the second application, it is illustrated how quantum optical systems can be described in terms of stochastic processes defined by Fokker-Planck equations. In this context, the quantum mechanical expectation values become expectation values of ordinary stochastic processes and can conveniently be determined by means of numerical simulations. Speaker: Till Daniel Frank (University of Connecticut, USA) • 15:45 Role of Mutual Information in Discrete and Continuous Time Markov Chains 15m There are some limitations of discrete-time Markov processes modeled as approximations to continuous-time Markov processes. In discrete-time simulation models, time is discretised into uniform steps and transitions between states are discribed by transition probabilities whereas, in continuous-time Markov processes, state changes are driven by transition rates. In our research, we focus on adaptive epidemic networks which consist of two main processes, i.e., infection and rewiring. Mutual information is used to quantify how correlate these two epidemic processes are to one another. We observe the similarities and discrepancies of discrete-time and continuouse-time via computer simulations, and show how discretisation of time affects mutual information. Speaker: Ms. Suwakan Piankoranee (Department of Physics, Faculty of Science, Chulalongkorn University) • 16:00 On the discrete-time two coupled harmonics oscillators 15m We take an assumption about the time variable in physics that actually the continuous time flow constitutes from in finite tiny discrete time steps resulting in different behavior of the system between these two time scales. To proof the assumption, the two coupled harmonic oscillators is studied as a toy model both in classical and quantum realms. In classical level, the discrete equation of motion is obtained as a discrete mapping. Under the continuum limit, a standard equation of motion is retrieved. In quantum level, the discrete wave function is obtained and interestingly the probability distribution is a bit broader than the usual one. Furthermore, the uncertainty principle in discrete-time case is modified by an extra-term containing a discrete-time parameter. Entanglement of the system is also studied by using the linear entropy in this discrete-time scale. The result shows that entanglement between two particles depends on the size of the discrete-time step and the coupling constant. As expected, the standard entanglement behavior is recovered under the continuum limit. We find that the system evolves differently in discrete-time scale comparing to the continuous-time scale. Speakers: Dr. Sikarin Yoo-kong (King Mongkut's University of Technology Thonburi ) , Mr. Watcharanon Kantayasakun (Department of physics , King Mongkut's University of Technology Thonburi ) • 16:15 Kinetic Monte Carlo simulations of uniform islands on flat and pillar-like substrates in heteroepitaxial thin film growth 15m The fabrication of uniform island nanostructures on heteroepitaxial thin films is a crucial step toward improving the efficiency of optoelectronic and solar cell devices. In this work, we investigate a strained heteroepitaxial thin film system in two dimensions using the kinetic Monte Carlo simulation method. The strain arising from the lattice mismatch is incorporated into the system using an atomistic ball-spring model. Films are grown onto flat and pillar-like substrates. For films on a flat substrate, growth condition dependence of film surface morphology, critical thickness, and island size is presented. For films on pillar-like substrates, uniformity of islands is investigated as a function of patterned substrate parameters. In contrast to the flat substrate, pillar-like substrates provide preferred sites for island formation and enhance island size uniformity. We found three types of island configurations with regular islands located on the top of filled windows, on the top of pillars, and at the bottom of windows. An island configuration diagram as a function of patterned substrate parameters is shown. Speaker: Dr. Manit Klawtanong (Department of Physics, Faculty of Science, Chulalongkorn University) • 16:30 Born approximation in linear-time invariant system 15m Linear-time invariant (LTI) oscillation systems such as mechanical vibration, series RLC and parallel RLC circuits under external driving force can be solved by using simplest initial conditions or employing of Green's function of which knowledge of initial condition of the driving force term is needed. Here we show a mathematical connection of the LTI system and the Helmholtz equation. Time-independent Schr\"{o}dinger equation in quantum mechanical scattering problem, as in undergraduate physics course, can be written in form of the Helmholtz equation. We apply Born approximation used in quantum mechanics to obtain LTI general solution in form of infinite Born series which can be expressed as a series of one-dimensional Feynman graphs. Conditions corresponding to the Born approximation and slow-roll approximation are given for the case of harmonic driving force. We show that by transforming the second-order LTI system into Helmholtz equation, the Born-approximated general solution can be found (at least to first order approximation) for any form of driving force, given the driving force initial value. Speaker: Dr. Burin Gumjudpai (IF Naresuan University) • 16:45 An advantage of greater diversity 15m We find greater genetic diversity in a Penna model when the mutation threshold is less than the reproductive age, for the case of individuals reproducing only once in their lifetime. This greater diversity is obtained at the cost of decreased saturation population. An increased mean lifespan was obtained for the population with greater genetic diversity. We interpret this longer lifespan as a benefit that supports the idea that it is better to have greater genetic diversity. Speaker: Mr. Amancio II Manceras (University of the Philippines Diliman) • 15:20 17:00 ThEP Sync room () ### Sync room ThEP meeting • 17:00 18:00 Poster Presentation II • 17:00 Determining the Relationship of Atmospheric CO2 Concentrations to Vehicular Traffic 15m This research aims to investigate the relationship between atmospheric carbon dioxide (CO2) concentrations, traffic count, vehicle type and meteorology at three study sites in Amphoe Muang Lampang in Thailand. Initial measurements were conducted since December 2016 from 2:00-4:00 PM. Since CO2 concentrations also depend on biospheric processes (photosynthesis and respiration), the chosen measurement time period corresponded to stable CO2 concentrations with a minimum amount of variability. This ensured that the measured CO2 concentrations primarily come from traffic. Multiple regression analysis will then be utilized to determine which factors contribute significantly to the measured CO2 emissions. Speakers: Ms. Laksika Chumphuin (Lampang Rajabhat University) , Ms. Suthima Fankrea (Lampang Rajabhat University) • 17:10 Low Temperature Reduction of Graphene Oxide by Plasma Processes 50m Graphene oxide (GO) is graphene sheet laced with oxygen-containing functional groups that located at edge of the lattice. The properties of GO can be modified depending on the degree of reduction of oxygen-containing functional groups. Typical methods to reduce GO include wet chemical processes and thermal annealing in which hazardous chemical substances and high temperature are applied. In this work, plasma processes are conducted to reduce GO. GO films on silicon substrates are exposed to argon plasma generated by a radio frequency (RF) discharge. By superimposing pulsed negative voltage at 5 kV to the substrate holder, argon ions in the plasma can be accelerated to interact with GO. The duty cycle of the pulse will be varied therefore GO samples undergo plasma treatment and ion implantation alternately. Changes in atomic compositions and structure are analyzed using X-ray photoelectron spectroscopy, atomic force microscope and Raman spectroscopy. Reduced GO can be obtained with a hybrid process at low temperature. Speaker: Mr. Krisada Soonthornnant (Department of Physics and Materials Science Faculty of Science, Chiangmai University Chiangmai, Thailand) • 17:10 Spectroscopic properties for identifying sapphire samples from Ban Bo Kaew, Phrae Province, Thailand 50m Gemstone commercial is a high revenue for Thailand especially ruby and sapphire. Moreover, Phrae is a potential gem field located at the northern part of Thailand. The studies of spectroscopic properties are mainly to identify gemstone using advanced techniques (e.g. UV-Vis-NIR spectroscopy, FTIR spectroscopy and Raman spectroscopy). Typically, UV-Vis-NIR spectroscopy is a technique to study the cause of color in gemstones. FTIR spectroscopy is a technique to study the functional groups in gem-materials. Raman pattern can be applied to identify the mineral inclusions in gemstones. In this study, the natural sapphires from Ban Bo Kaew were divided into two groups based on colors including blue and green. The samples were analyzed by UV-Vis-NIR spectrometer, FTIR spectrometer and Raman spectroscope for studying spectroscopic properties. According to UV-Vis-NIR spectra, the blue sapphires show higher Fe^{3+}/Ti^{4+} and Fe^{2+}/Fe^{3+} absorption peaks than those of green sapphires. Otherwise, green sapphires display higher Fe^{3+}/Fe^{3+} absorption peaks than blue sapphires. The FTIR spectra of both blue and green sapphire samples show the absorption peaks of –OH,-CH and CO_{2}. The mineral inclusions including zircon, feldspar, rutile and ferrocolumbite in sapphires from this area were observed by Raman spectroscope. The spectroscopic properties of sapphire samples from Ban Bo Kaew, Phrae Province, Thailand are applied to be the specific evidence for gemstone identification. Speaker: Jidapa Mogmued (Department of Earth Sciences, Faculty of Science, Kasetsart University) • 17:15 Production of dried shrimp mixed with turmeric and salt by Spouted Bed technique enter the rectangular chamber. 15m Today, dried shrimp in the market were refused food coloring and drying until shrimp are colorful and tasty. Meanwhile, Community groups, women's health trying to produce food products come from herbs. As an alternative to consumers. The production process is also a traditional way to dry. In order to extend the shelf life longer. Sometimes, potential risks, both in quality and quantity of products. As a result, consumers are enormous. Thus, this research aims to study the possibility to produce shrimp dried mixed with turmeric and salt. Then dried shrimp mixed with turmeric and salt to keep up the quality criteria of the Food and Drug Administration-FDA It can reduce the risk of the consumer and can keep up in a kitchen Thailand. When buying shrimp from the fisherman's boat Will be made clear, clean impurities and shaking the sand to dry. Prepare a mixture of turmeric and salt. The shrimp were dipped into a beef with stirrer for 3 minutes. And scoop up shrimp salad with dried jerky. Measurement of initial moisture content averaging 83%wb. Then drying technique Spouted enter the rectangular chamber a continuous manner. Until average moisture content to 17%wb. The air temperature in the drying chamber at 180 oC and hot air speed 4.3 m/s, a state heat transfer Mass and moisture within the shrimp.In chamber when drying, the shrimp have moved freely behavior can spit water out faster does not burn. Shaving legs of shrimp shell fragments lightweight is sorting out the top of drying chamber. Private shrimp were dried out to the front of the quad drying chamber. Power consumption 27.5 MJ / kg, divided into electrical energy 12.3 MJ / kg and thermal energy is 15.2 MJ / kg. The hot air comes from burning LPG gas burner with dual automatic. And can adjustable to room temperature drying characteristics Modulation setting. Speaker: Mr. PISUT THANTONG (KMUTNB) • 17:30 Design and construction of portable survey meter 15m This work was aimed to design and construction of portable survey meter for radiation dose measuring. The designed system consists of 6 parts including GM-tube radiation detector, low voltage power supply, high voltage power supply, pulse conditioning, processing and display on android phone. The test results indicated that the ripple voltage of low and high voltage power supply were less than 1%. The maximum integral counts were found to be 3×105 cps. It was found that the developed system had small size and light weight for portable measuring system. Speaker: Mr. Warut Singseeta (Ubon Ratchathani University) • 17:45 2D Seismic Wave Forward Modeling by Finite-Difference Method 15m The purpose of this work is to study and develop a forward modelling computer program of 2D seismic wave by using finite-difference method. Forward modeling is a method that shows how seismic wave propagates through particular subsurface area, and also one of the schemes in Inversion method which is used for modeling the prospect area from the acquired seismic field data. Despite the fact that this method can be done by various techniques, this work will focus on using finite-difference approximation to solve the wave equation. To clarify this, the subsurface model is built and divided into grids and nodes which represent the physical properties corresponding with seismic wave propagation. After that, the equation of motion will be solved spatially and temporally on each node by finite-difference method with the consideration of initial and boundary condition to obtain its displacement value; the displacement on the surface in a period of time can be shown as "Synthetic seismograms". In stability and accuracy test, the program will be conducted on various kinds of subsurface models, and its results will also be compared with that of the existed program. Furthermore, different value of the number of grid points per wavelength and stability constant will be tested in order to find the optimum value of each interested model. Speaker: Mr. Phudit Sombutsirinun (Chiang Mai University) • 17:45 A Comparative Study of Gunshot Residue Obtained from M16 and AK47 Rifles for Forensic Science. 15m The qualitative and quantitative study of gunshot residue (GSR) obtained from M16 and AK47 rifles are reported. The GSR samples were collected from various different sources of the shooter (hand, cloth, and helmet), elapsed time, and number of shooting. The scanning electron microscope with electron dispersive X-ray spectrometry (SEM/EDS) showed that the various shapes and sizes of the GSR samples as well as unique particles were observed. The unique particles have various elemental compositions such as Pb, Ba, Sb, Ti, Zn, and Sr. According to the inductively coupled plasma-Mass spectroscopy (ICP-MS) investigation, it is found that the heavy metal concentration increases as the number of shooting. The heavy metal concentrations depend on which parts of source are studied. The results showed that the heavy metal concentration and GSR particles decrease when the elapsed time increases. In this study shows that, SEM/EDS can identify the unique particles and their elemental composition, while ICP-MS can only measure the exact concentration of heavy metals in GSR. Speakers: Ms. Plaifhon Pooyooyen , Ms. Saowaluk Sodchuen • 17:45 A Molecular Dynamics Study of the Interfacial Regions Between Polymer and Carbon-Based Nanoparticle Fillers 15m A novel polymer composite material with high stiffness and thermal endurance can be designed by optimizing the filler content. We investigated the microscopic properties of the interfacial regions between cis-polyisoprene (natural rubber) and carbon-based fillers, e.g. fullerenes by using classical molecular dynamics (MD) simulations. The microscopic analysis shows that increasing filler concentration results in the growing of the regions containing ordered cis-PI chain at the interfacial areas. In this work, we analysed the order parameter, e.g. local density and orientation at the interfacial and confined regions which correspond to changes in mechanical and thermal properties. These results could provide the information for the parameterisation of the coarse-grained or the continuum models. Speaker: Dr. Thana Sutthibutpong (Theoretical and Computational Science (TaCS) Center) • 17:45 A portable flat vacuum cell and the effect of its surface adsorption 15m In this work, we discussed about our construction of a portable flat vacuum cell and our study of the effect of surface adsorption in the cell in which thermal atoms were trapped. The cell comprised two parallel glass plates that were separated by a narrow gap in order to accentuate the dominance of collisional frequency along the glass surface’s normal. The identification and measurement of the effect of adsorption were based on variation of a distance between the glass plates, kinetic energy of the atoms, and types of material coated on the surfaces. The result was useful in designing cold atom transport inside a cell with restricted dimension. Speaker: Mr. Nakarin Jayjong (Chiang Mai University) • 17:45 A preliminary study on identification of Thai rice samples by INAA and statistical analysis 15m This study aims to investigate the elemental compositions in 50 Thai rice samples using instrumental neutron activation analysis (INAA) and to identify rice according to their types and rice cultivars using statistical analysis. As, Mg, Cl, Al, Br, Mn, K, Rb and Zn in Thai jasmine rice and Sung Yod rice samples were successfully determined by INAA. The accuracy and precision of the INAA method were verified by SRM 1568a Rice Flour. All elements were found to be in a good agreement with the certified values. The precisions in term of %RSD were lower than 7%. The LODs were obtained in range of 0.01 to 29 mg kg-1. The concentration of 9 elements distributed in Thai rice samples was evaluated and used as chemical indicator to identify the type of rice samples. The result found that Cl, Al, As, Br, K and Rb concentrations in Thai jasmine rice samples are significantly different but there was no evidence that Mg, Mn and Zn are significantly different from concentration in Sung Yod rice samples at 95% confidence interval. Our results may provide preliminary information for discrimination of rice samples and may be useful database of Thai rice. Speaker: Dr. Supalak Kongsri (Thailand Institute of Nuclear Technology) • 17:45 A review of scalar eld cosmology: Its non-linear Schrodinger-type formulation 15m Standard cosmological model containing barotropic fluid in arbitrary spatial curvature and scalar field under arbitrary potential can be described in the form of non-linear Schr\"{o}dinger (NLS) formulation. The formulation leads to the simpler way in obtaining exact scalar field solutions. NLS may be useful for interpretation of wave function in quantum cosmology. Speaker: Ms. Chonticha Kritpetch (The Institute for Fundamental Study "The Tah Poe Academia Institute (TPTP)") • 17:45 A Study of Star Formation by H\alpha Emission of Galaxies in the Galaxy Group NGC 4213 15m This research aims to study hydrogen alpha emission, corresponding to star formation of galaxies in the NGC 4213 group that has an average recession velocity of 6,821 km/s. The imaging observations with broad-band filters (B, V and R_\text{C}) and narrow-band filters ([S II] and Red-continuum) were carried out from the 2.4-m reflecting telescope at Thai National Observatory (TNO). There are 11 sample galaxies in this study, consisting of 3 elliptical, 1 lenticular and 7 spiral galaxies. It was found that the late-type galaxies tend to be bluer than early-type galaxies, due to these galaxies consist of relatively high proportion of blue stars. Furthermore, the equivalent width of hydrogen alpha (EW(H\alpha)) tends to increase as a function of morphological type. This indicates that star formation in late-type galaxies taking place more than the early-type galaxies. Furthermore, a ratio of the star formation rate to galaxy mass also increases slightly with the galaxy type. This could be due to the interaction between galaxy-galaxy or tidal interaction occurring within the galaxy group. Speaker: Sakdawoot Maungkorn • 17:45 A study of two qubits system with Quantum operator formalism 15m A two-qubit system is studied in the quantum operator formalism to analyze the open system consisting of two atoms in a cavity. The evolution of an open system is usually described in the Kraus representation which is constructed by considering a large closed system. In this work, we consider the short time scale of the evolution of systems in terms of interaction Hamiltonian. We focus on the construction of the Kraus operators, which results in the density matrix to support the master equation. This allows analyze the stability of the entanglement of two qubits system. Speaker: Ms. Siriratchanee Thammasuwan (Authors) • 17:45 A study the period variation rate of V1292 Taurus RR Lyrae variable star 15m This research was aimed to study the period variation rate of V1292 Taurus RR Lyrae variable star. The observational data was obtained on 0.5 meter Reflecting Telescope with CCD photometer camera in (Blue light, B) and (Visible light, V) bands at Regional Observatory for the Public, Nakhon Ratchasima province. The data have been analyzed to plot the light curves. From the (Observed-minus-Calculated, O-C) diagram analysis, we see that the period of this variable star is 0.5714981 days and the period variation rate is increased of 4.8669436 sec/year. Speaker: Patsakorn Prachumlek • 17:45 Air Pollution Estimates from Vehicular Emissions in Amphoe Muang Lampang, Thailand 15m In this research, engine emissions from different vehicle age, type and used fuel in Amphoe Muang Lampang in Thailand were measured and studied with a portable gas combustion analyzer. Concentrations of carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), nitrogen oxides (NOx) and sulfur dioxide (SO2), as well as exhaust gas temperature (flue temperature, FT), net calorific efficiency (Effn) and gross calorific efficiency (Effg) were measured. Together with vehicle number statistics gathered from the Lampang Land Tranport Office, results from this study will be used to estimate the amount of vehicular pollution released. Speakers: Ms. Pawika Audwing (Lampang Rajabhat University) , Ms. Porntiwa Poutong (Lampang Rajabhat University) • 17:45 Analysis data of sensitive layer and charge collection electrode of monolithic pixel sensors for the ALICE ITS upgrade 15m In this work we will present the analysis results of the explorer-0 chips which have been irradiated by 5.9 keV X-ray from ^{55}Fe sources. The explorer-0 chip is a prototype CMOS imaging sensor designed for new Inner Tracking System of ALICE detector. Here we focus on four important parameters, the pixel pitch, the collection electrode size, the distance between the electrode and the surrounding electronics, and the reverse bias voltage on the collection diode. The optimized values of these parameters will be used in the final design of pixel chips. Speaker: Wanchaloem Poonsawat (Suranaree University of Technology (TH)) • 17:45 Analysis of Physical Properties and Evolution of Binary System V2790 Ori 15m V2790 Ori is a W Uma Eclipsing Binary with an orbital period of 0.28784200 day. From the previous investigation of its light curve, it was found that this binary system has a continuous orbital period change. A light curve of V2790 Ori was analyzed using program Maxlm DL4 and its period change was also calculated. The result revealed that the orbital period of V2790 Ori was continuously decreased at rate of 3.44623820×10^{-3} seconds per year to 8.67350882×10^{-3} seconds per year. From the analysis of physical parameters and model, it was found that V2790 Ori had a contact characteristic had high mass ratio. This would be the evolution of V2790 Ori would be a single star due to mass transfer of the system. Speaker: Mr. Sarawut Chulok (Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University) • 17:45 Annealing Effects on Surface Morphology of IrMn Thin Films 15m IrMn alloy has been intensively studied during last few years in order to improve exchange bias strength in magnetic storage. IrMn layer is usually coupling with a ferromagnetic layer to increase sensitivity in magnetic sensor due to its critical thickness. It can maintain high exchange strength even at ultra-thin layer. In this study, thermal annealing was performed at different temperatures in Ar atmosphere and air. The surface of as-deposited samples showed smooth surface and contain small grains. After annealing, surface grains exhibited flatter and larger for Ar-annealing. However for air annealing, some very large grains were developed on IrMn thin film surface. It was identified as Mn-Oxide by using micro-Raman spectroscopy. The effects of annealing temperature and annealing time on the formation of Mn-Oxide will be discussed during the presentation. Speaker: Ms. Kanogkwan Sawaengsai • 17:45 Application of combined gas-fired infrared and air convection drying for quality and energy consumption of instant rice 15m As an excellent source of nutrients, riceberry has gained more intention than white rice. However, information of instant rice obtained from riceberry is scarce. An alternative technique of instant rice preparation was therefore proposed in this work. The combined gas-fired infrared burner and air convection drying at different gas-fired infrared burner intensities was investigated. Gas -fired infrared burner intensities at 350 to 550oC were combined with a 40oC temperature and 1 m/s air velocity. The result shown that the drying rate increased with gas-fired infrared intensity, hence reducing the total drying time. The total color difference (∆E) varied from 3.5 to 4.2. Increasing gas-fired infrared intensity decreased in hardness, chewiness and gumminess, but increased the rehydration of instant riceberry. The effective moisture diffusivity increased with the gas-fired infrared intensity varying from 1.37x10-11 to 3.64×10-10 m2/s. The specific energy consumption at 550oC was 2.90 kWh/kg of water removed resulting in a 76% energy saving when compared to 350oC. This study gives a method for preparation of instant rice; it would be a good choice to instant rice in the industry. Speaker: Dr. Mali Nachaisin (sanawong_14@hotmail.com) • 17:45 Applying Isotope Techniques for Sustainable Development of Groundwater in the Upper Chao Phraya Basin (Bang Rakam area) 15m The upper Chao Phaya Basin is the largest Cenozoic sedimentary basin that is located in the upper central part of Thailand. The basin is a high potential area for agricultural activities, such as growing rice, sugarcane and vegetables. In each year, the groundwater level has decreased continuously about 10-30 cm/year. Groundwater levels dropped from 5-10 m. to 10-25 m below ground surface at present. The water samples from groundwater, and surface water in Bang Rakam area were collected for analysis of stable isotopes (O-18 and H-2 in water), .tritium (H-3) and Carbon-14 (C-14) as well as chemical composition such as major cat ion and anion as well. The most of groundwater samples, they have the water as of Na^+- Ca^{2+} - HCO_3$$^-$ type with indicating cationic exchange between Na and calcium along the flow path. The groundwater quality in this area is good quality below the maximum allowable limit of WHO(World Health Organization) for agriculture and consumer. The $\delta$$^{18}O and \deltaD values of the rain water samples vary from 1.71 ‰ to -13.89 ‰ and 18.30 ‰ to – 106.59 ‰ respectively. The origin of groundwater system in this area comes from local rainfall and surface water. The groundwater samples that depth less than 30 meters below the ground surface and away two kilometres from Yom river are effective on the river. The main flow direction of the groundwater system is movement from the south western of study area by means of tritium data. The average recharge rate of groundwater system were estimated by CMB (Chloride Mass Balance) using the average of chloride content in groundwater samples, the average of chloride content in rainfall sample during 2013 to 2014 as well as the effective of rainfall amount (mm/year). It is about 220 mm/year. The Chloride mass balance method shows that 10 % of the effective annual rainfall is recharge to the aquifer. Groundwater ages using tritium content can be separated into two groups. Group 1(groundwater ages is less than 50 years ago) that groundwater samples are deep above 50 meters below the ground surface and Group 2 (groundwater age is more than 50 years ago) by the depth more than 50 meters below the ground surface. Speaker: Mr. Kiattipong Kamdee • 17:45 Atmospheric water vapor: Distribution and Empirical estimation in the Atmosphere of Thailand 15m Atmospheric water vapor is a crucial component of the Earth's atmosphere, which is shown by precipitable water vapor. It is calculated from the upper air data. In Thailand, the data were collected from four measuring stations located in Chiang Mai, Ubon Ratchathani, Bangkok, and Songkhla during the years 1998-2013. The precipitable water vapor obtained from this investigation were used to define a empirical model associated with the vapor pressure, which is a surface data at the same stations. The result shows that the relationship has a relatively high level of reliability. The precipitable water vapor obtained from the upper air data is nearly equal to the value from the model. The model was used to calculate the precipitable water vapor from the surface data 85 stations across the country. The result shows that seasonal change of the precipitable water vapor was low in the dry season (November-April) and high in the rainy season (May-October). In addition, precipitable water vapor varies along the latitudes of the stations. The high value obtains for low latitudes, but it is low for high latitudes. Speaker: Mr. Sayan Phokate (Applied Physics, Faculty of Engineering, Khon Kaen Campus, Rajamangala University of Technology Isan, Khon Kaen) • 17:45 Auroral bright spot in Jupiter's active region in corresponding to solar wind dynamic 15m Jupiter’s polar emission, whose brightness behavior appears to be unstable. This work focuses on the bright spot in active region which is a section of Jupiter’s polar emission. Images of the aurora were taken by Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). Previously, two bright spots, which were found on May 13th 2007, were suggested to be fix on location described by system III longitude. The bright spot’s origin in equatorial plane was proposed to be at distance ~80-90 Jovian radii and probably associated with the solar wind properties. This study analyzes additional data on May 2007 to study long-term variation of brightness and location of bright spot. The newly modified magnetosphere-ionosphere mapping based on VIP4 and VIPAL model are used to locate the origin of bright spot in magnetosphere. Furthermore, the Michigan Solar Wind Model or MsWim are also used to study the variation of solar wind dynamic pressure during the time of bright spots observation. We purpose that the bright spots appear nearly the same location which corresponds to the origin in magnetosphere and the solar wind dynamic pressure should probably affect to the bright spots variation. Speaker: Suwicha Wannawichian (Department of Physics and Materials Science, Chiang Mai University) • 17:45 Beam Dynamic Simulation of the Thermionic RF Electron Gun with Self-generated Cathode Emission 15m A thermionic RF-gun is an essential component in electron injector for producing a quality electron beam for a THz radiation source at Plasma and Beam Physics Research Facility, Chiang Mai University. The RF gun consists of one and a half normal conducting resonant cavities and a side-coupling cavity which operates in pi/2-mode at frequency of 2856 MHz. In 2014, the gun design was improved by changing the position of a RF input port from horizontal coupling plane to the vertical plane in order to obtain symmetry beam at the gun exit. In this work, geometry of each main accelerating cell as well as the position of the side-coupling cavity are modified to have more symmetric electromagnetic field simulated by using the CST Microwave Studio. Beam dynamic study is performed by using PARMELA. In addition, we created the initial thermionic particle distribution obeying Maxwell-Boltzmann distribution for PARMELA simulation instead of the built-in distribution. The transverse and longitudinal profiles of the beam at cathode and gun exit are compared with the case of the built-in distribution. Furthermore, this self-generated distribution can be used as an initial thermionic emission distribution for the charged particle tracking code, ASTRA. The comparison of beam profiles at gun exit which simulated by PARMELA and ASTRA is presented and discussed in this paper. Speaker: Chaipattana Saisa-ard (Chiang Mai University) • 17:45 Building and testing antennas wainscot from teak and para scrap woods: Built-up Column type and Spaced Column type 15m In the wood production manufacturing process, there are a lot of wood scraps must be left to waste. To product a pole from the wood scrap, which help to reduce cost in the production, is to use the wood scrap more efficiently. In this work, the wood poles were be designed, constructed and tested from teak and Para wood scrap by using finger joint with Polyvinyl Acetate. To constitute of these poles with being 4 inches thickness, 4 inches wide and 1 meter length were be tested in two types; built-up column and spaced column. To determination the ability of forced endurable was be acted on the vertical wainscot or compression test of wood parallel to grain by following the standard. The stipulation of the provisions of the Engineering Institute of Thailand announced that ability of forced endurable or compression test of wood parallel to grain must not less than 91 kN or 90 kg/cm2; respectively. In the results were found that ability of forced endurable of wainscots form teak and Para wood scrap has more standard value, and the maximum value of ability of forced endurable was 204 kN. The wainscot in spaced column type used less wood scraps and glue volume than the wainscot in built-up column type. Speaker: Mr. Jamon Wasuratmanee (KMUTNB) • 17:45 Calcium oxide synthesis from cockle shells. The catalyst For the production of biodiesel from palm oil. 15m This research study Calcium oxide synthesis from cockle shells for catalyst in biodiesel production from palm oil. The shells are calcium is transformed into calcium oxide. This is a powerful catalyst for the transesterrifcation reaction. The research was burned cockle shells at 900 °C for 5 hours. The ratio of methanol : oil is 9 : 1 molar. The temperature reaction at 80 °C for 30 minutes. The amount of calcium oxide powder 1-5% mass of oil. Found that calcium powder 3% shown the best quality biodiesel in highest standards level and % productivity. Due to the density in the standard criteria ASTM D 1298, 860 kg/m^3 – 900 kg/m^3, the viscosity is criterion standard ASTM D 445, 3.5 cSt - 5 cSt,. The color is compliant biodiesel is transparent. and pH is be neutral. Keywords: Biodiesel Transesterification Cockle shell calcium oxide Speaker: Ms. Subaidah A wae (Authors) • 17:45 Characterization of Structural and Optical Properties of CsI:Tl Crystals With Different Precursor Purity 15m Cesium iodide doped with Thallium (CsI:Tl) is one of the most materials used for radiation detector applications. In this work, the CsI:Tl crystals that made from the material sources with different precursor purity were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Raman scattering, UV-Vis spectroscopy and photoluminescence (PL). The purpose is to verify effects of precursor purity on structural and optical properties of CsI:Tl crystals. It is expected that type and level of impurities in the precursor is directly related the structural and optical properties. With a modified homemade Bridgman–Stockbarger technique, CsI:Tl samples were grown in two levels of CsI and TlI reactant materials, i.e., having as a very high purity of 99.999 % and a high purity of 99.9 %. XRD showed a good quality of CsI:Tl crystals. It exhibited a cubic structure with a lattice constant of 0.457 nm. From the lower-purity raw materials, the crystal was found in an orange color with a lattice constant of 0.456 nm. CsI:Tl surface morphology by SEM exhibited a smooth surface with some parallel crystal facets. By EDX measurement, elements of C, O, Al and Br were observed for both samples. The total amount of impurity in the sample with a 99.99% purity seems to higher that in the sample with a 99.999% purity. The brighter PL emission was obtained from the orange crystals suggesting impurities. Other details of investigation will be discussed during the presentation. Speaker: Mr. Poramin Sintham (Department of Physics, Faculty of Science, Chulalongkorn University) • 17:45 Classification of Glutinous rice RD6 Grain Using Machine Vision and Support Vector Machine 15m We report here the use of machine vision and support vector machine for automatic identification of Glutinous rice RD6. This project is motivated from the problem of maintaining purity of RD6 seed stock, since they can mutate back to its parent KDML105. Seed stock is needed to be checked to ensure that contamination percentage does not exceed the excepted value. We use flat bed scanner to capture the image of rice seeds. The grain features, i.e. grain length and width, seed area, perimeter length, circularity, centroid position relative to the interception of length and width, are extracted. Support vector machine is used to find the hyperplane to separate the features of RD6 and its parent. Our experiments of 500 seeds of RD6 shows that the accuracy of our classification system can reach 0.5%, which satisfy the requirement of pure seed stock. Speaker: Ms. Pananya Somwong • 17:45 Comparison of Characteristics of Hydroxyapatite Powders Synthesized from Cuttlefish Bone via Precipitation and Ball Milling Techniques 15m The aim of this work was to compare characteristics of hydroxyapatite synthesized by precipitation and ball milling techniques. The cuttlefish bone powder was a precursor in calcium source and the di ammonium hydrogen orthophosphate powders was a precursor in phosphate source. The hydroxyapatite was synthesized by the both techniques such as precipitation and ball milling techniques. The phase formation, chemical structure and morphology of the both hydroxyapatite powders have been examined by X-ray diffractometer (XRD), Fourier transform infrared spectroscope (FTIR) and field emission scanning electron microscope (FESEM), respectively. The results show that the hydroxyapatite synthesized by precipitation technique formed hydroxyapatite phase slower than the hydroxyapatite synthesized by ball milling technique. The CO_3$$^-$ group appeared in the hydroxyapatite synthesized by ball milling technique, but not appeared in another. The morphology of the hydroxyapatite from the both techniques were sphere like shapes and particle size was about in nano scale. The average particle size of the hydroxyapatite by ball milling technique was less than those synthesized by precipitation technique. This experiment indicated that the ball milling technique take time less than the precipitation technique in hydroxyapatite synthesis.

• 17:45
Construction of Earth's field NMR signal transmission system 15m

The NMR signal transmission system at earth magnetic field was constructed. The system consists of 5 important components: Arduino Mega 2560 microcontroller, frequency generator module (DDS synthesizerAD9850), switching integrated circuit (DG419), operational amplifier (THS3001) and audio-power amplifier. The microcontroller was programmed to receive the pulsed width values from computer and control the frequency generator connected to the microcontroller. The two signals from the digital pin of Arduino (square waves) and the AD9850 synthesizer (sine waves) were then mixed together using DG419 to give pulsed-audio frequencies. Afterwards the signal was sent to the op-amp circuit and continually transmitted to the audio-power amplifier to achieve 40 Watts power. It was found that, the constructed system can be performed the radio pulses in the range of audio frequencies which corresponds to the Larmor frequency for earth’ field NMR.

• 17:45
Correlation between Electrical Resistivity and pH of Lateritic Soil 15m

Soil is heterogeneous medium which consist of liquid, solid and gaseous phases. Natural soils of various types have different electrical properties due to the composition, structure, water content, pH and temperature. This research aims to study the correlation of electrical resistivity for predicting pH of lateritic soil. The samples of soil were collected from farm of Kasetsart University Chalermphrakiat Sakonnakhon Province Campus in Thailand. The electrical conductivity was investigates by EC meter and converse to electrical resistivity and the pH was investigate by pH meter. Then analyzed the relationship between variables using statistical methods were the correlation coefficient Spearman Rank and simple regression found that the electrical resistivity was associated with the pH of lateritic soil.

Speaker: Mr. Somkuan Photharin (Faculty of Science and Engineering)
• 17:45
Correlation between Io's lead angle and the satellite's magnetic footprint 15m

This research studies on the nature of aurora feature on Jupiter, especially the aurora that connects to its satellite, Io. Jupiter has a large magnetosphere, as a result of strong magnetic field strength. This magnetosphere corotates with Jupiter and extends over all of Galilean satellites. The interaction between Jupiter’s rotating magnetic field and Io cause plasma particles to flow along the magnetic field line in directions toward both north and south hemispheres. Some particles will penetrate into Jupiter’s ionosphere and collide with atmosphere particles, leading to aurora emission, at the position of Io’s footprint. Io is surrounded along its path, by a cloud of plasma particles with high density, which is called Io torus. This torus enhances the effect of bending magnetic field lines when they pass Io and result in inaccuracy of the prediction of longitudinal position of Io footprint. This shift of longitudinal prediction can be mapped to the shifted position of Io, which is called lead angle. Our objective is finding the relation between all three parameters, which are magnetic field strength, Io footprint brightness and lead angle at the same Io footprint position or the same Io longitude. We use VIPAL magnetic field model, develop by Hess et al. (2011) to trace along the magnetic field line and finding magnetic field strength at any given position. This tool is vital for determination of the relation between magnetic field strength, Io footprint brightness and lead angle.

Speaker: Dr. Suwicha Wannawichian (Department of Physics and Materials Science, Chiang Mai University, Chiang Mai, Thailand)
• 17:45
CuFeO$_2$ formation using fused deposition modeling 3D printing and sintering technique 15m

CuFeO$_2$ is a metal oxide mineral material which is called delafossite. It can potentially be used as a chemical catalyst, and gas sensing material. There are methods to fabricate CuFeO$_2$ such as chemical synthesis, sintering, sputtering, and chemical vapor deposition. In our work, CuFeO$_2$ is prepared by Fused Deposition Modeling (FDM) 3D printer. The composite filament which composed of Cu and Fe elements is printed in 3 dimensions, and then sintered and annealed at high temperature to obtain CuFeO$_2$. Suitable polymer blend and maximum percent volume of metal powder are studied. When percent volume of metal powder is increased, melt flow rate of polymer blend is also increased. The most suitable printing condition is reported and the properties of CuFeO$_2$ are observed by scanning electron microscopy, and dynamic scanning calorimeter, X-ray diffraction. As a new method to produce semiconductor, this technique has a potential to allow any scientist or students to design and print a catalyst or sensing material by the most conventional 3D printing machine which is commonly used around the world.

Speaker: Mr. Ahamad Salea (Advanced Material Processing Laboratory,Material science and engineering program, Faculty of science, Mahidol university, Bangkok, 10400, Thailand)
• 17:45
Deep Shear Wave Velocity of Southern Bangkok and Vicinity 15m

Bangkok is located on the soft marine clay of the Lower Chaopraya Basin which can amplify seismic wave and affect to building shaking. Shallow shear wave velocity to depth 30 m. (V$_s$30) is widely studied recently but data of deeper layer to bedrock still absent. The missing data are useful for earthquake engineering design and ground shaking estimation.

This study aims to measure deep shear wave velocity profile down to bedrock of southern Bangkok region. Microtremor measurements with 2 seismographs using Spatial Autocorrelation (SPAC) technique were done at 8 sites. The data was collected in day time on linear array geometry varied between 5-2,000 m. Long natural wavelength at the frequency 0.2-0.6 Hz. was detected at many sites. The results show that shear wave velocity function of Southern Bangkok is between 100-2,000 ms$^{-1}$ and indicate that the bedrock depth is about 600-800 m, except at Bang Krachao. Very deep shear wave data of many sites are ambiguous due to noise and survey limitation.

Speaker: Mr. Thanagrit Wongpanit (Department of Earth Sciences, Faculty of Science, Kasetsart University )
• 17:45
Design and Construction of a Small Vacuum Furnace 15m

The general high temperature furnaces are usually used in the atmosphere, a sample it consequently contacts the air that has pollutants, there makes the sample impure by exposure in a particular way to be not required and difficult to control gas that requires to an interaction within a sample. A heating technique in a vacuum environment is required to fix the referred problems. The purpose of this research is designing and construction of a small vacuum furnace. A cylindrical graphite was chosen as the material of the furnace and the cylinder aluminum sheets employed to prevent the heat radiation that transfers from the furnace to the chamber wall. Using a rotary pump, the system can be pumped down to 30 mTorr, the heating wire drives the graphite furnace to 700 °C while the temperature of the chamber enclosure remains relatively low. Heat losses from the graphite furnace by conduction, convection, and radiation were analyzed. The dominating heat loss was found to be caused by the blackbody radiation, which can thus be used to estimate the relationship between graphite furnace temperature and the drive power needed. The cylindrical graphite furnace has an inner diameter of 44 mm, the outer diameter of 60 mm and 45 mm in height, only 355.5 W of power is needed to drive the furnace to 700 °C.

Speaker: Ms. piroonrat peawbang (Ubon Ratchathani University)
• 17:45
Design and Development of Emittance Measurement Device by Using the Pepper-pot Technique 15m

Transverse emittance of a charged particle beam is one of the most important properties that reveals the quality of the beam. It is related to intensity, size and angular displacement of charged particles in transverse phase space. There are several techniques to measure the transverse emittance value. One of a practical method is the pepper-pot technique. This research concentrates on development of a pepper-pot device to measure the transverse emittance of electron beam produced from a thermionic cathode RF electron gun at the Plasma and Beam Physics Research Facility, Chiang Mai University. Simulation of beam dynamics is conducted by using programs PARMELA, ELEGANT and self-developed C code. The geometry and location of the pepper-pot and its corresponding screen station are included in the simulation. The result from the study is used to design and develop the pepper-pot experimental station. Results from the measurements and the simulation prediction will be presented and discussed in this contribution.

Speaker: Ms. Siriwan Pakluea (Chiang Mai university)
• 17:45
Determination of $\omega-\phi$ mixing at leading order 15m

The $\omega-\phi$ mixing plays an important role in particle interactions involving vector mesons. The SU(3) flavor symmetry predicts the flavor mixing in vector meson nonet. The $\omega-\phi$ mixing angle was predicted by several physical processes, such as decay rate, radiative decay of $\omega$ and $\phi$. In this work, we calculated vector meson masses by using chiral Lagrangian at leading order (LO) and fitted them to the physical vector meson masses. We adjusted two low energy parameters, $m_V$ and $b_D$, at the ideal mixing angle. We found that the value of the low energy parameters can recover the $\rho-\omega$ mixing, which is the well-known property of vector meson at LO. Furthermore, when we treated the mixing angle as a free parameter, together with the $m_V$ and $b_D$, and refitted to the physical masses, we obtained the mixing angle differ from the ideal mixing angle by 2 degrees, and the vector meson masses slightly differ from their physical values.

Speaker: Mr. Ruchipas Bavontaweepanya (Mahidol University)
• 17:45
Determining the appropriate altitude to improve accuracy in rainfall estimation from radar reflectivity data. 15m

Keywords : Z-R Relationship, Rainfall Estimation, Weather Radar, Radar Reflectivity, Rain gauge, Altitude, Correlation Coefficient, Root Mean Square Error, RMSE, Scatter Plot

Speaker: Mr. Manot Lakkham (Kasetsart University)
• 17:45
Development of electropinning system have a hemispherical collector 15m

This research project has developed electrospinning system for performance increasing of the system. Operating system was changed from the computer controlled to command on the machine and status of system show on display on LCD screen. Moreover, this research has developed working control programs with Arduino board. Component of electrospinning system are source of voltage, flow rate control system and metal collector which can be synthesis fiber in nano scale. Then, calibration of flow rate can be adjusted by delay value and solution injection time of 10 ml leads to relation between flow rates with delay. The system can adjust flow rate that requirements. The performance test use polyvinylpyrolidone solution for spinning fiber and analysis characteristic by using scanning electron microscope techniques (SEM).
The improvement of the flow rate has resolution at 0.1 mm/hr. Hence, the electrospinning system can be processed fiber in order nano scale. the relation between flow rate with delay was delay equal 1,255 of divided by the flow rate. The resolutions of flow rate are adjusted at 0.1 ml/hr. The fiber was fabricated from the conditions of 10 kv at distant between the tip of needle and ground collector at 15 cm. Morphology of fibers are smoothness. And, size of fibers are uniformly

Speaker: Mr. piriya praneekit
• 17:45
Development of Beam Diagnostic System for Natural Rubber Vulcanization Linac 15m

This research focuses on design and development of beam diagnostic system of an electron linear accelerator (linac) for natural rubber vulcanization at the Plasma and Beam Physics Research Facility, Chiang Mai University. The main components of the accelerator include a DC thermionic electron gun and an S-band standing-wave linac. The system will be used to produce electron beams with adjustable energy in the range of 0.5 to 4 MeV and a pulse repetition rate of 20 to 400 Hz with the maximum pulse duration of 4 μs. The maximum electron pulse current is expected to be 100 mA. Design and development of beam diagnostic instruments to measure electron beam energy, pulse current and electron dose are underway. The beam energy will be measured in ambient air after the beam exiting the linac by using a dipole magnet, a phosphor screen and a CCD camera. Measurements of current and charge of electron beam are performed by using a current transformer and a Faraday cup, respectively. This contribution will describe and discuss on the results of the design and construction of the beam diagnostic system as well as the results of the beam measurement.

Speaker: Mr. Ekkachai Kongmon (Chiang Mai University)
• 17:45
Development of measurement system for gauge block interferometer 15m

We developed a measurement system for collecting and analyzing the fringe pattern images from a gauge block interferometer. The system was based on raspberry pi which is an open source system with python programming and opencv image manipulate library. The images were recorded by the raspberry pi camera with 8 mega pixel capacity. The noise of images was suppressed for the best result in analyses. The low noise images were processed to find the edge of fringe patterns using the contour technique for the phase shift analyses. We tested our system with the phase shift pattern between a gauge block and a reference plate. The phase shift patterns were measured by a Michelson type of interferometer using the He-Ne laser with the temperature controlled at about 20 $^0$C. The results of the measurement will be presented and discussed.

Speaker: Sakchai Chomkokard
• 17:45
Development Thermoelectric Properties of Al-doped ZnO Materials for Thermoelectric Module and Power Generator 15m

The main objective of this work is to synthesized Zn0.96Al0.04O thermoelectric materials for fabrication thermoelectric modules and invention thermoelectric generator. The Zn0.96Al0.04O sample was prepared by a conventional solid state reaction method. The formation of structure was proved by X-ray diffraction and the thermoelectric properties were measured. The results showed that the Zn0.96Al0.04O displayed thermoelectric materials and showed thermoelectric properties as higher than that of ZnO based. The Zn0.96Al0.04O thermoelectric modules displayed the power output was increase with number of module, increase difference temperature and operating at high temperature. The Zn0.96Al0.04O thermoelectric generator showed high performance for electric generator at high temperature. The sixteen Zn0.96Al0.04O legs thermoelectric generator of this work produced electric power at1.4 mW at 800 (when T = 600 ◦C). The Zn0.96Al0.04O materials can be applied for application of thermoelectric generator at high temperature.

Speaker: Mr. Singkarn Chanprateep
• 17:45
Digital Lock-in Amplifier based on Soundcard Interface for Physics Laboratory 15m

Jinda Sinlapanuntakul, Puchong Kijamnartsuk, Chanthawut Jetjamnong, S. Chotikaprakhan
Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900 Thailand.

Keywords: Digital lock-in amplifier, RLC circuit, Physics laboratory.

The purpose of this paper is to develop a digital lock-in amplifier based on soundcard interface for undergraduate physics laboratory. Both series and parallel RLC circuit laboratory are tested because of its well-known, easy to understand and simple confirm. The sinusoidal signal at the frequency of 10 Hz – 15 kHz is generated to the circuits. The amplitude and phase of the voltage drop across the resistor, R are measured in 10 step decade. The signals from soundcard interface and lock-in amplifier are compared. The results give a good correlation. It indicates that the design digital lock-in amplifier is promising for undergraduate physic laboratory.

[1] Tepelea L, Gavrilut I, Neamtu O, Gergely E, Gacsadi A, 17th “Building Services, Machanical and Building Industry Days” International Conference, 13-14 Oct. 2011, Debrecen Hungry.
[2] Ye B, Chen F, Li M, Int. J. of Signal Processing, Image Processing and Pattern Recognition 8(4), 361 (2015).

Speaker: Jinda Sinlapanuntakul
• 17:45
Eclipsing Binary in the Field of Open Cluster NGC 2126 15m

Eclipsing binaries with pulsating components are very crucial objects for asteroseismology. We present the results of an analysis of photometric time series observations for the intermediate-age open cluster NGC 2126 acquired during the years 2004, 2013 and 2015 with the aim to detect new variable stars and to study binary systems. The CCD photometric light curves in V band of the eclipsing binary with pulsating component named V551 Aur are presented. Our four epochs of light minimum along with others compiled from the literature were used to revise the orbital period which is 1.173 days. The Wilson-Devinney technique was used to analyze the light curves for determining a new set of the system’s parameters. According to the analysis, the solution shows that V551 Aur is a detached eclipsing binary system with a mass ratio of about 0.77 and inclination of about 73 degree. A frequency analysis of the eclipse-subtracted light curve gives a main frequency of f$_1$ = 7.713 c/d. The ratio between the orbital and pulsation periods with the value of 9.05 may indicate the existence of resonance or a possible causal relation to tidal effects suggesting that the 9th harmonic of the orbital period is excited by the tidal forces.

Speaker: Ms. Nareemas Chehlaeh (Chiang Mai University)
• 17:45
Effect of Bacterial Cellulose and its Carbon Nanofiber Derivatives Addition on the Compressive Strength of Cement Paste Composite. 15m

The mechanical properties of cementitious materials, widely applied in construction, could be improvedby reinforcement with cellulosic natural fibres. In this study, another type of natural fibers, i.e. the bacterial cellulose (BC) obtained from coconut jelly (nata de coco) was added to cement paste to form the reinforced composites. The coconut jelly was thoroughly washed and blended prior to mixing with cement pastes. Up to 15 wt% of BC was added to the cement paste. The workability of the cement composites was controlled to be the same for every mix. The samples were then tested for compressive strength at the age of 7 and 28 days. The improving trend of the properties for BC-cement composites was not clearly seen. However, when the BC was pyrolyzed, carbon nanofibers (CNF) were obtained. The cement pastes with CNF addition showed an improvement for their compressive strength. The strength increased with CNF amount and aging time. The morphology of both BC-cement and CNF-cement composites at their fracture surfaces was observed under scanning electron microscopy (SEM). The correlation between the mechanical property and microstructure was discussed.

Keywords: Bacterial Cellulose; Carbon Nanofiber; Cement; Compressive Strength

Speaker: Mr. Nuttawat Parse (Khon Kaen University)
• 17:45
Effect of Carbon Fiber and Nano-Silica Addition on the Microstructure, Electrical and Mechanical Properties of Fly Ash Geopolymer 15m

Geopolymer is an environmental friendly construction material which has a potential for replacing cement. In the present study, the addition of carbon fiber and nano-silica in geopolymer paste was studied in terms of the electrical and mechanical properties, and the microstructure. The geopolymer paste was made from fly ash by blending it in Na$_2$SiO$_2$/NaOH solution using the liquid/ash ratio of 0.4. Up to 2 wt% of nano-silica and 5 wt% of carbon fiber were added in geopolymer paste. In each mix, the workability of the paste was tested and controlled using a mini-slump test. After casting, the composite pastes were cured at 25C or 60C for 24 hr. The property and microstructure measurements were performed at 7, 14 and 28 days. For the electrical property, the I-V curve of each sample was measured using a 4-point probe method. The electrical resistivity generally increased with nano-silica addition but decreased with carbon fiber content. On the other hand, mechanical test showed that the compressive strength did not have a clear trend when any additive was mixed. The phase formation and functional groups were analysed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) while the fractured surface morphology after compression was investigated under a scanning electron microscope (SEM).

Keywords: geopolymer; carbon fiber; nano-silica; electrical property; compressive strength

Speaker: Mr. Pichainarong Boomprasert (Khon Kaen university )
• 17:45
Effect of Cationic ions in mud and Laterite to indigo blue interactions using molecular dynamics simulation 15m

Molecular dynamics simulations of Cationic ions in mud and Laterite, indigo blue molecules and cotton molecules have been carried out to investigate effect of Cationic ions to indigo blue interactions. The results show that appearances of cations improve both indigo blue - indigo blue interaction and indigo blue - cotton interaction. This result obey the experimental results.

Speaker: Mr. Keerati Maneesai
• 17:45
Effect of doping by different transition metal oxides on the elastic and structural properties of recycled borosilicate glasses 15m

Recycled borosilicate glass (RBSG) was used a composition in 80RBSG–20Na2O glass systems doped with different transition metal oxides (TMOs) (where TMOs = V2O5, Cr2O3, CuO, ZnO, ZrO2, Ag2O and CdO). The ultrasonic velocities (both longitudinal and shear) of glass systems were measured by using pulse echo technique. Measurements were carried out at 4 MHz frequency at room temperature. The densities of the glasses were performed by Archimedes’ principle and used n-hexane as the immersion liquid. The elastic moduli, Poisson’s ratio and micro-harness are found to be rather sensitive to the glass composition. The obtained results were showed that the properties of glasses were decreased when doped the amount of TMOs. The amount of TMOs have the effect on rigidity of the glass network structure. These results related to the number of non-bridging oxygens (NBOs) and supported by FTIR spectroscopy.

Keyword: Recycle borosilicate glasses; Elastic moduli; Pulse-echo technique

Speaker: Poonnaphob Sopapan (Department of Physics, Faculty of Science, Ubon Ratchathani University)
• 17:45
Effect of External Economic Field and Market Temperature on Stock-Price Hysteresis and Price-Return Distribution: Monte Carlo simulation on the Ising Agent-Based Model. 15m

In this work, the stock price variation in a form of dynamic hysteresis was investigated via Monte Carlo simulation. The Ising spin Hamiltonian was considered as the level of ‘disagreement’ (in the social economic) which has to be minimized for the market sustainability. The Ising spin directions (either +1 and -1) were considered to refer to an agent’s intention to perform his action on trading (either to buy or to sell) in the stock market. The effect of economic variation in a form of periodic cycle was also considered via the external field term in the Ising Hamiltonian. The stochastic Monte Carlo simulation was performed on this Ising system to elucidate the market trends on the overall. The single spin flip Metropolis algorithm was used to update the spin directions. Waiting until the system was in steady state, the excess demand and supply were then extracted via the Ising magnetization. After that, the stock price were calculated from this magnetization to observe its variation with a function of time and external economic field. From the results, it was found that the external field parameters (the economic influence strength and period) and market temperature have significant effect on the stock price changes, resulting in different characteristic of price-return distribution. Specifically, the return distribution becomes broader in shape with increasing the external influence strength, which is due to that the higher encouragement in price changing causes larger gaps among stock-price intervals. On the contrary, the distribution becomes less broad with increasing the market temperature, which is caused by a higher level of ‘monetary’ fluctuation which inspires more frequent trading. Consequently, the price gap becomes less in size and hence the distribution broadness. This reason can also be applied to describe how the distribution evolves with changing the economic period. After that, the non-linear empirical fit was performed on judging applicability of the considered Ising model on describing real markets. However, due to available states in the Ising model are only +1 and -1 whereas there could be many more in real system, this could be the reason why the distribution was too narrow to extract diversity of time-lag in the return-distribution for drawing constructive fits (i.e. too few data points to achieve fine R-squares). However, the exponent values obtained from the fits still give suggestive results how the market reacts when changing the external influence parameter and temperature for the specified system, i.e. the system where each agent has only intention to buy or to sell with the same magnitude. For instance, these results can be used as a basis for further analysis of how external economic parameters and market temperature affect the price-distribution and its time-lag availability.

Speaker: Dr. Yongyut Laosiritaworn (Chiang Mai University)
• 17:45
Effect of Lightweight aggregates prepared from fly ash on lightweight concrete performances 15m

Lightweight aggregates were prepared from fly ash of by-products from the paper industry. The influence of the ratio of clay to fly ash and processing conditions on lightweight aggregates properties were investigated. It was found that the amount of fly ash directly affected to porosity of lightweight aggregates. Lightweight aggregates with the ratio of clay to fly ash at 80:20 wt% using the sintering temperature at 1210$^{o}$C exhibits the bulk density of 1.66 g cm$^{-3}$ and the compressive strength of 25 MPa. The replacement of coarse aggregates with lightweight aggregates at 100 wt% for concrete production showed the ultimate properties of concrete with density of 1780 g cm$^{-3}$, water absorption of 3.55%, compressive strength of 40.94 MPa and thermal conductivity of 0.77 W m$^{-1}$ K$^{-1}$. The concrete had more than 25% weight reduction while keeping a similar compressive strength to an ordinary concrete. This is revealed that lightweight aggregates could be applied into structural concrete because it was able to reduce work load and increase safety factor of construction.

Speaker: Dr. Rudeerat Suntako (Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University Kamphang Saen Campus, Nakhon Pathom 73140, Thailand)
• 17:45
Effect of Mg on Mechanical Properties of Mg$_x$Fe$_{(3-x)}$O$_4$ Prepared by Solid State Reaction 15m

The synthesis of Mg$_x$Fe$_{(3-x)}$O$_4$, X = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 and 0.9 was performed by solid state reaction with various rotating speed of ball milling (160, 240 and 320 rpm). Samples were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM). Shrinkage and Vickers were used to determine the phase structure, physical properties and mechanical properties of magnesium ferrite. The result of XRD pattern shows that the single phase could be obtained with a rotating speed of 160, 240 and 320 rpm. Also, by using JCPDS200-002-013 showed ferrites phase and crystallize size with a range of 1.54-2.57 $\mu$m. Moreover, the maximum percentage of shrinkage, 16.641 was obtained with X=0.8 and a rotating speed of 240 rpm. The highest density of ceramic of 3.834 g/cm$^3$ was obtained with X=0.1 and a rotating speed of 320 rpm. The Vickers hardness of 7.442 x 10$^3$ kg/m$^2$ was obtained with X=0.8 and a rotating speed of 160 rpm.

Speaker: Aekasit Sutthapintu
• 17:45
Effect of Shelf Life to Void Under Die for Die Attach Process in Integrated Packaging 15m

This research studied about reduction of void under die in die attach process. Die attach process is one that is very importance process in the integrated circuit(IC) packaging. A popular adhesive material used for attaching between die and leadframe or substrate of a package which is an epoxy. Snap cure process is also important to make a completed epoxy due to cross linking to enhance microstructure of epoxy stiffness. The shelf life before snap cure process effect to void under die of multichip package because of a long time of attaching cause risk to happen void under die.In experiment, the wait time before snap cure were varied from 0 until 8 hours with a step of 1 hour and analyzed the void under die of epoxy by die shear test, x-ray and reliability test after take the test samples out from the snap cure. The results confirmed that the wait time effect to void under die of die attach process in IC packaging.

Speaker: varunee paktramook
• 17:45
Effect of thick barrier in a gapped graphene Josephson junction 15m

We study the Josephson effect in a gapped graphene-based superconductor/barrier/superconductor junction as using the Dirac-Bogoliubov de Gennes (DBdG) equation for theoretical prediction. A massive gap of this regime is induced by fabricating a monolayer graphene on substrate-induced bandgap and superconductivity is acquired by the proximity effect of conventional superconductor (s-wave superconductor) through top gate electrodes. This Josephson junction is investigated in case of thick barrier limit that is pointed out the effect of applying a gate voltage V$_\text{G}$ in the barrier. We find that the switching supercurrent can be controlled by the gate voltage V$_\text{G}$ and the effect of thick barrier can influence the switching linear curve. When the barrier is adjusted to manner of a potential well which is inside the range of -mv$_\text{F}$$^\text{2}$$\leq$V$_\text{G}$$\leq$0, the supercurrent in thick barrier case is examined to the same behavior as the thin barrier case. The controlling supercurrent through the electrostatic gate is suitable for alternative mechanism into experimental test.

Speaker: Tatnatchai Suwannasit (King Mongkut’s University of Technology North Bangkok)
• 17:45
Effecting aging time of epoxy molding compound to molding process for integrated circuit packaging 15m

This research studied about effecting aging time of epoxy molding compound (EMC) that effect to reliability performance of integrated circuit (IC) package in molding process. Molding process is so important of IC packaging process for protecting IC chip (or die) from temperature and humidity environment using encapsulated EMC. For general molding process, EMC are stored in the frozen at 5 degree celsius and left at room temperature at 25 degree celsius for aging time on self before molding of die onto leadframe is 24 hours. The aging time effect to reliability performance of IC package due to different temperature and humidity inside the package. In experiment, aging time of EMC were varied from 0 to 24 hours for molding process of SOIC-8L packages. For analysis, these packages were tested by x-ray and scanning acoustic microscope to analyze properties of EMC with an aging time and also analyzed delamination, internal void, and wire sweep inside the packages with different aging time. The results revealed that different aging time of EMC effect to properties and reliability performance of molding process.

Speaker: Jirayu Tachapitunsuk
• 17:45
Effective capacitance of metallic single electron transistor 15m

We proposed a method to calculate the effective capacitance of a metallic single-electron transistor using the quantum Monte Carlo method to describe the Coulomb blockade effect. The effective capacitance depended on the induced gate charge, temperature, and conductance of the system. Furthermore, the results can be used to calculate the effective charging energy, which can characterize the strength of the Coulomb blockade effect. In the Coulomb blockade regime, the effective charging energy was approximately equal to charging energy. In particularly, the effective charging energy decreased with an increase in the conductance and temperature.

Speakers: Dr. prathan srivilai , Mr. pipat harata
• 17:45
Effects of an intermediate c-GaN buffer layer on structural and optical properties of AlN films on MgO (001) substrates 15m

Effects of an intermediate cubic GaN (c-GaN) buffer layer on structural and optical properties of AlN films on MgO (001) substrates via radio frequency plasma assisted molecular beam epitaxy (RF-MBE) were investigated with Raman scattering, X-ray diffraction, and UV spectroscopy. The samples studied in this work are AlN films grown under Al-rich condition with and without intermediate c-GaN buffer layer. There are 2 types of c-GaN intermediated layers, which are a one-step grown buffer layer with a 7-nm-thick c-GaN layer and a two-step grown buffer layer with a sequence of a 7 nm- and a 200 nm-thick c-GaN layers. Raman spectra recorded using an excitation wavelength of 473 nm of AlN films with a two-step grown c-GaN buffer layers showed the cubic phase related phonon modes at 662 cm$^{-1}$ and 902 cm$^{-1}$, which are corresponded to TO and LO, respectively. On the other hand, the AlN film directly grown on MgO (001) substrate showed only the hexagonal AlN (h-AlN) related phonon modes at 610 cm$^{-1}$, 653 cm$^{-1}$ and 884 cm$^{-1}$, which are corresponded to A$_1$ (TO) and E$_2$ (high), and A$_1$ (LO), respectively. While, the AlN film with a 7 nm-thick intermediate c-GaN layer showed a mixed vibrational modes between c-AlN and h-AlN. As a result, we found out that the structural phases of AlN can be modified from hexagonal to cubic phases with an insertion of a two-step grown c-GaN buffer layer as intermediate layer between the AlN film and the MgO substrate. This result was confirmed by X-ray diffraction measurements, both in 2$\theta$/$\omega$ scan and reciprocal lattice mapping modes. Therefore, a use of an intermediate c-GaN buffer is the key for the growth of highly pure c-AlN film. Besides, results of UV spectroscopy measurements established the Cauchy dispersion relation for reflective index, n (λ), in a range of 200 to 400 nm. For long wavelength limit, reflective index of the c-AlN and h-GaN was examined to be 2.00 and 2.15, respectively.

Speaker: Mr. Nutthapong Discharoen
• 17:45
Electrical properties of two-dimensional zinc oxide in hexagonal, (4,4)-tetragonal, and (4,8)-tetragonal structures by using Hybrid Functional calculation 15m

Two-dimensional (2D) material is a specific type of materials with its thickness being thinned down to single atomic layer. In many materials, their 2D sheets have been reported to yield very different physical properties from those of their ordinary bulk and other forms of nanostructures. For instance, the band gap of 2D semiconductor sheets can vary from zero band gap (semi-metals, e.g., graphene) to wide band gap insulator (e.g., BN sheet). Among many available metal oxide semiconductor, the monolayer zinc oxide possesses many intriguing properties, such as wide band gap, high charge carrier mobility, being flexible and inherited optical transparency, so it has become a new generation semiconductor of flexible and transparent optoelectronics. However, the growth of the 2D structure in typical semiconductors is very difficult to control as appropriate synthesized technique for such the structure is not well established yet. Specifically, the synthesis route to form the ultrathin 2D material requires breaking of crystal symmetry and fostering of anisotropies in crystal growth. However, successful epitaxial growth of ZnO monolayer in hexagonal structure on graphene substrate was recently achieved and reported to have band gap up to 4 eV. In addition, sub 100-nm-sized ZnO nanosheet in hexagonal wurtzite and tetragonal structures were also found to successfully grow in the solution synthesis using surfactant molecules as a facet at the water-air interface. These then illuminate some possibilities in nano-engineering the structure to achieve ultrathin semiconductor with desired properties. However, the guidelines to comprehend this structure-property relationship should be firstly established. Therefore, in this work, the two-dimensional zinc oxides were studied in tetragonal and hexagonal structures. The electronic calculation was performed using Heyd-Scuseria-Ernzerhof (HSE) hybrid density functional, which mixes the exact non-local exchange of Hartree-Fork (HF) theory with the local exchange and correlation potential of Perdrew-Burke-Ernzerhof (PBE) functional from generalized gradient approximation (GGA). The calculation results showed that the band gaps of 2D ZnO structures are 4.20 eV in hexagonal, 3.06 eV in (4,4)-tetragonal, and 4.59 eV in (4,8)-tetragonal structure, respectively. In term of structure stability, the hexagonal ZnO has more energetic favorable than both of (4,4)- and (4,8)-tetragonal ZnO for about 5.10 eV and 3.15 eV. The small energy differences between these 2D ZnO phases suggest that the phase transformation between these structures is reversible, suggesting band gap values appearing in range (instead of discrete). Consequently, to synthesis 2D ZnO with a single pure phase require great attention during the growth. However, the underlying band gap differences between these 2D ZnO structures open the band gap tunable opportunity (when mixing) to be implemented in optoelectronics via nano-engineering.

Speaker: Mr. Chumpol Supatutkul
• 17:45
Electricity Cogenerator from Hydrogen and Biogas 15m

This research studied about electricity cogenerator from Hydrogen and Biogas and the factors that cause that effecting Hydrogen from Aluminum which was a cylindrical features. By using a catalyst was NaOH and CaO, it was reacted in distilled water with percentage of Aluminum : the catalyst ( NaOH and CaO ) : the distilled water, which were 2 : 8 : 1, respectivety. And the percentage of Hydrogen was highest 64.73 % by flowing of constant gas at 0.56 liter/minute and brought to mix with Biogas afterwards, that have been led to electricity from generator 1 kilowatt and studied the voltage and electricity as well.
The result of study the factors that cause to the effecting Hydrogen. The research outcomes were concentration of solutions that caused amount and percent of maximum Hydrogen was to at 10 %wt and 64.73 % which rate of flowing of constant gas 0.56 liter/minute as temperature 97 degree Celsius. After that led Hydrogen was mixed by Biogas next, conducted to electricity from generator and leveled the voltage of generator at 220 Volt in the order to the voltage as the voltage an electric with in house. There after the measure of electricity current and found electricity charge would be constant at 3.1 Ampere. And rate of Biogas flowing and Hydrogen, the result were the generator used Biogas rate of flowing was highest 9 liter/minute and the lowest 7.5 liter/minute, which had rate of flowing around 8.2 liter/minute. Total Biogas was used around 493.2 liter or about 0.493 m3 and Hydrogen had rate of flowing was highest 2.5 liter/minute, the lowest 1 liter/minute.

Speaker: Wasan Pinate (Program of Physics, Faculty of Science,Rajabhat MahaSarakham University)
• 17:45
Elemental composition analysis of stony meteorites discovered at Phitsanulok, Thailand 15m

Teerayut loylip1,2*, Suwicha Wannawichian2,3
1Graduate School, Chiang Mai University, Chiang Mai, Thailand
2National Astronomical Research Institute of Thailand (NARIT), Chiang Mai, Thailand
3Department of physics and Materials Science, Chiang Mai University, Chiang Mai, Thailand

E-mail: teerayut@Narit.or.th

Abstract

 A meteorite is a fragment of iron, stone or stony–iron rock. The falling of meteorites to Earth's surface is part of Earth’s accretion process from dust and rocks in our solar system.  When these fragments come close enough to the Earth to be attracted by its gravity, they may fall into the Earth. Following the detection of objects that fall from the sky onto a home in Phitsanulok on June 27, the meteorites were analyzed by Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) instruments. XRD analysis shows presence of three main elements in the meteorites, which are Forsterite, Enstatite and Anorthite. The data from SEM analysis shows that the meteorites are mainly composed of Fe-Ni and Fe-s. The meteorite is Achondrite, a class of meteorite which does not contain Chondrule. The meteorites in this work are thought to be part of a large asteroid.


Keyword : Meteorite, SEM, XRD, Achondrites, Chondrule, Forsterite, Enstatite, Anorthite

Speaker: Mr. Teerayut Loylip
• 17:45
F and D Supersymmetry Breaking in AdS Space 15m

The Nelson-Seiberg arguments of the connection between supersymmetry breaking and R-symmetry breaking is determined for gauged and localized supersymmetry theories with generic superpotential. This is a study of symmetry breaking in supergravity theory. The metastable vacua of supergravity from the contribution of F and D auxiliary fields in superpotential are determined, and also anti-de Sitter vacua. One find that the cosmological constant and vacuum energy could also be lifted to a small positive value.

Speaker: Mr. Sirapat Lookrak (Mahidol university)
• 17:45
Fabrication and preparation of Mg-reducing 12CaO•7Al$_2$O$_3$ cement for enhancing of electrical and optical properties 15m

Polycrystalline Ca$_{12}$Al$_{14}$O$_{33}$ (C12A7) were synthesized by conventional solid state reaction method and were calcined/sintered at 1300˚C. The Mg powder was used to reduce oxygen inside of nano-cage to form free electron in the cage for enhancing the electrical and optical properties of C12A7 cement compound. The crystal structure of the C12A7 and Mg-reducing C12A7 were characterized by X-ray diffraction, morphology and element composition were investigated with scanning electron microscope. In addition, Optical properties were measured by UV-VIS-NIR spectrophotometer that shown transition of absorption because the samples change from white to green powder. Finally, the sample was measured electrical conductivity and carrier concentration by the Hall Effect which can be confirmed existence of electron in the structure and the enhancing properties will be reported.
Keywords: Ca$_{12}$Al$_{14}$O$_{33}$, Mg reducing agents.

• 17:45
First Principles Study of Structural Stability and Electronic Band Structure of Al2C Monolayer and Nanotube 15m

Excitonic solar cells (XSC) based on heterojunction nanostructure composed of low-dimensional materials have gained a great deal of interest due to its large interface area and hence the high possibility in generating excitons. In general, the power conversion efficiency (PCE) of this XSC depends strongly on the interface band alignment between donor and acceptor materials. Therefore, low-dimensional materials with adjustable band alignment are highly desirable for achieving high PCE applications. Among many candidates, Al$_2$C monolayer(s) with band gap of 1.05 eV has been proposed as a suitable material for photovoltaic applications. The similar expectation is also paid for Al$_2$C nanotube as it possesses even higher surface area ratio. However, structural stability and band gap of the nanotube have not been reported yet, even though there has been assumption that it may be possible to tune the band gap by varying nanotube radius. Therefore, in this work, we use density functional theory based on generalized gradient approximation (GGA) and hybrid functional (HSE06) to investigate structural stability and band gap of both Al$_2$C monolayer and nanotube. From the results, both GGA and HSE06 band gaps of Al$_2$C monolayer agree well with previously reported data, which confirms the validity of our calculations. Then, for the Al$_2$C nanotube, we found that its band gap is somewhat sensitive to the size and the helicity of nanotube. Specifically, the band gap for zigzag (n,0) nanotube vanishes (i.e. the metallic state) when nanotube diameter (d) is reduced to about 8.0 Å. On the other hand, the band gap for zigzag (0,n) nanotube increased to about 1.2 eV under the decrease of nanotube diameter to 7.5 Å. Furthermore, at small diameter limit (d < 20 Å), the strain energy as a function of nanotube radius indicates that Al$_2$C nanotube is even more stable than the widely studied SiC$_2$ nanotubes. With radius dependence, the wide range and adjustable band gap of Al$_2$C nanotube provide its capability to be tuned in obtaining suitable/desired band alignment for enhancing PCE of XSC.

Speaker: Mr. Sittichain Pramchu (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University)
• 17:45
First-principles study of native defects in ZnRh$_2$O$_4$ spinel 15m

Transparent conducting oxides (TCOs) are widely used for many applications. Typically, most of TCOs are intrinsically n-type semiconductors and are difficult to be doped for p-type conductivity. The spinel ZnRh$_2$O$_4$ has been recognized as a potential p-type TCO. In this work, we present energetics and electronic properties of native defects including vacancy, interstitial and antisite defects in ZnRh$_2$O$_4$ by mean of first-principles calculations. Computed pinned Fermi levels are closed to the valence band edge in any possible growth conditions. It is thus difficult to grow an n-type ZnRh$_2$O$_4$, which is consistent with experimental facts. Based on our calculated formation energies, we observe that the Zn vacancy (V$_{Zn}$) acts as a deep acceptor and has relatively high formation energy, and thus V$_{Zn}$ is unlikely to be responsible for the p-type conductivity. By contrast, we find that Zn substituting for Rh (Zn$_{Rh}$) acts as an acceptor forming a shallower transition level than that of V$_{Zn}$. Under O-rich/Rh-poor and Zn-rich/O-poor conditions, Zn$_{Rh}$ is found to be the major source of unintentional p-type conductivity in ZnRh$_2$O$_4$. To enhance hole concentration, we suggest experimentalists to grow ZnRh$_2$O$_4$ under high oxygen partial pressure with low Rh concentration.

Speaker: Ms. Kodchakorn Simalaotao (Kasetsart University)
• 17:45
Forbush decreases detected at the Princess Sirindhorn Neutron monitor in the 24$^{th}$ Solar Cycle 15m

Neutron monitors (NMs) are ground-based detector designed to measure the cosmic ray (CR) intensity, sometimes observe a sudden reduction in galactic CR intensity, the so-called Forbush decreases (FDs) event. The Princess Sirindhorn NM (PSNM) was established in 2007, an NM64-type and 3 bare tubes located at the world's highes geomagnetic vertical cutoff rigidity 16.8 GV was installed at Doi Inthanon in Thailand, 2565 m above sea level. In this work we study the FDs in CR intensity detected at PSNM that occurred during the 5 years of 2010-2015 in the 24$^{th}$ solar cycle. We analyze the FDs at the Oulu NM in Finland in order to identify and compare them. We identify 46 FDs at both PSNM and Oulu NMs then we used the student's t-test to assess difference in the mean between simultaneous or non-simultaneous of FDs event. We found that the 46 FDs, 22 are simultaneous and 24 non-simultaneous. Furthermore, we also found that student's t-test analysis reveals that FDs at PSNM have smaller intensity variation of main phase duration of main phase than at Oulu NM. The results of the present statistical analysis that support the PSNM can provide CR data of reliability comparable to that of the Oulu NM. This work also provides unique data of FDs and solar modution.

Speaker: MALIWAN DEEPROM (UBON RATCHATHANI UNVERSITY)
• 17:45
Full Characterization of Two-beam Magneto-optical Trap 15m

In standard magneto-optical trap (MOT), three pairs of cooling beams orthogonally intersect at the magnetic field minimum produced by anti-Helmholtz coils. The degree of off-centering seriously determines the trapping velocity, lowest temperature reached, decoherence time, and the shape and density of the cold atomic cloud. Our alternative two-beam trap was designed for efficiently cooling and capturing rubidium-85 atoms while maximizing the optical accessibility to the cold gas. In contrast to the MOT, only two focused counter propagating laser beams were employed. The confocal configuration provides additional trapping force due to spatial light shift in the transverse direction with respect to the beam axis while the trap potential is still predominated by the interplay between the Doppler shift and Zeeman shift. Here, we have performed the first full characterization of the two-beam trap and discussed parameters that influence the trap efficiency. The trap number, temperature, density and geometry of the atomic cloud are compared with the standard MOT.

Speaker: Mr. Nuttanan Tanasanchai
• 17:45
Gamma-ray shielding and structural properties of strontium–lead–silicate glasses 15m

The gamma-ray attenuation coefficients of strontium–lead–silicate glasses have been measured by using a narrow beam transmission technique for gamma ray photon energies at 122, 662, 1173 keV and X-ray attenuation technique for gamma ray photon energies at 74.228 keV. These coefficients were then used to obtain the values of mass attenuation coefficients and half value layer. In order to evaluate gamma-ray shielding properties for glass samples, mass attenuation coefficients have been calculated with the WinXcom computer software. The results have been used to calculate half value layer parameters. The molar volume, FTIR, longitudinal velocity and longitudinal modulus have been used to study the structural properties of the prepared glass system.

Keywords: Glasses, Radiation shielding, Gamma-ray attenuation coefficients

Speaker: Pattaranipa Gunhakoon (Department of Physics, Faculty of Science, Ubon Ratchatani University, Warinchamrab, Ubon Ratchatani, 34190,Thailand.)
• 17:45
Geometry-Dependent Faraday Rotation in Strained Graphene 15m

We investigate coherent single photon in the infrared regime traveling in the positive z direction passing through a single layer of strained graphene. The angle of rotation relates to space deformation by the terms of directional dependent fermi velocity. Analytical expressions of full quantum mechanics, by second-quantization approach, are obtained for components of the magneto-optical tensor.
The transmission, reflection and faraday angle can be calculated.

Speaker: Mr. Phusit Nualpijit (Kasetsart University)
• 17:45
Giant Dielectric in Sb-Single Doped Rutile-TiO2 Ceramics 15m

Sb-single doped rutile-TiO$_2$ (STO) ceramics were prepared by a conventional mixed oxide method. The high-dielectric performance with giant dielectric constant value ($\epsilon$'$\approx$10$^4$) with low dielectric loss (tan$\delta$<0.05) of STO ceramics over a wide temperature range were obtained. Scanning electron microscope coupled with energy-dispersive X-ray analysis (EDX) and X-ray diffraction technique were used to characterize the microstructure and crystal structure, respectively. The existence of Ti$^{3+}$ was confirmed using X-ray photoelectron (XPS) technique. X-ray absorption near edge structure (XANES) technique were also carried out. The origin of the observed high-dielectric performance in STO ceramics was investigated.

Speaker: Mr. Apiwat Boonkhuang (Khon Kaen University)
• 17:45
Gibbs Energy Additivity Approaches in Estimation of Kinematic Viscosities of n-Alkane-1-ol 15m

Alcohols are solvents for organic and inorganic substances. Kinematic viscosity of liquid is important transport properties. In this study model for estimating n-alkane-1-ol kinematic viscosity are correlated to the Martin’s rule of free energy additivity. Data available in literatures are used to validate and support the proposed equations. The kinematic viscosity of n-alkane-1-ol can be easily estimated from its carbon number (z) and temperatures (T). The Bias, average absolute deviation and coefficient of determination (R$^2$) in estimating of n-alkane-1-ol are -0.17%, 1.73% and 0.999, respectively. The kinematic viscosity outside temperature between 288.15 and 363.15 K may be possibly estimated by this model but accuracy may be lower.

Speaker: Suriya Phankosol
• 17:45
Identification of charm quark jets at the CMS experiment 15m

The hadronic products that result from proton-proton collisions at the Large Hadron Collider (LHC) can give rise to jet formation that can be detected be the Compact Muon Solenoid (CMS) detector. Several interesting physics, both Standard Model (SM) and Beyond Standard Model (BSM), processes can result the final states with charm quark jets. Analyzes rely on the algorithms that try to identify the flavour of these jets, called heavy-flavour taggers. In addition to the widely used b-tagger to identify the bottom quark jets, the new algorithm is developed to identify charm quark jets while rejecting bottom and light flavour jets. Such the algorithm is consequently called c-tagger. C-tagger relies on the characterestic of charm quarks hadronizing to long lifetime D mesons. Consequently, they travel a significative distance before decaying into showers of detectable particles, called jets. These new tracks arised from this decay do not point back to the primary interaction vertex. Thus, charm jets can be distinguished by particular properties such as secondary vertices from displaced tracks with respect to the primary interaction. The algorithm to identify charm jets, c-tagging algorithm, is invented based on Combined Secondary Vertex algorithm for b-tagger. C-tagger uses a Boosted Decision Tree (BDT) as multivariate analysis (MVA) technique to study a set of jet properties in order to identify jets originated from charm quarks. It is the first of its kind at the CMS collaboration. The c-tagger is integrated into the CMS software (CMSSW). It can be used in supersymmetry (SUSY) searches for new particles such as stop, the SUSY partner of standard model (SM) top, that may subsequently decay to a charm quark and the lightest supersymmetric particle (LSP), and for SM precision measurements in the data taking at the Large Hadron Collider (LHC) in 2016 and 2017.

Speaker: Kittikul Kovitanggoon (Chulalongkorn University (TH))
• 17:45
Implementation of a Parallel Simplex Algorithm 15m

The Nelder-Mead method or Simplex algorithm was proposed in 1965 by John Nelder and Roger Mead. It is widely used to fi?nd minimum values of speci?c functions in Mathematics and Physics. We implemented a framework for minimization algorithm
in C++ based on the non-parallel Simplex scheme and a parallel adaptation. For the
parallel simplex algorithm, we used the Message Passing Interface (MPI) which is a C language library for parallel programming. We show that this parallel Simplex method yields a higher computational efficiency than the non-parallel Simplex algorithm.