# Siam Physics Congress 2016

Asia/Bangkok
Description
Participants
• Aekgaran Sangmala
• Akanit Nisup
• Akkapong Haopinjai
• Akkarach Sukserm
• Akkawat Ruammaitree
• Alejandro Saiz
• Alisa Saengsonachai
• Amorn Thedsakhulwong
• Anchalee Malaithong
• Anioat Paevongjeen
• Anirut Phriksee
• Aniwat Kesorn
• Anucha Pratumma
• Anusara Chonprakai
• Anusara Thiangtham
• Anuson Niyompan
• Aparporn Sakulkalavek
• Araya Taengthet
• Areerat Muangsan
• Arthit Laphirattanakul
• Arunee Eambaipreuk
• Atis Yosprakob
• Attasit Phakam
• benjamas ponboonjaroenchai
• Boonyarit Chatthong
• Bovornpratch Vijarnwannaluk
• Buagun Samran
• Chaiwat Prohmpetch
• chaiyaporn sukollapun
• Chalongwut Boonpratum
• CHamp Pongsathorn
• Chanita Katavut
• Chat Pholnak
• Cherdchai Wuttiya
• Cherdsak Bootjomchai
• Chinapat Mongkholsiriwattana
• Chittakorn Polyon
• Choksin Tanahoung
• Chutharat Paikaew
• David Ruffolo
• Direk Boonthum
• dph3ay Yangthaisong
• Duangkamol Dungphontong
• Dusit Ngamrungroj
• Ekkarat Pongophas
• FARUNG SURINA
• Fattah Sakuldee
• Gomat Nuntasing
• Gp.Capt.Srithus Chaimee
• Grittiya Pongsupa
• Gun Chaloeipote
• Gurpreet Singh Chahal
• Ittipat Promnorakid
• Jaruchit Siripak
• Jidapa Rattanarojpan
• Jindaporn Suebkumpet
• jintana Laopaiboon
• Jirattiporn Sanguansuttigul
• Jirawat Assawakhajornsak
• Jiroj Kaewmanee
• Jitprabhat Ponchai
• Jittrathep Sukultanasorn
• Jompoj Wongphecauxson
• Juthamas Inthanont
• Kaewkwan Liengswangwong
• Kajornyod Yoodee
• Kamolporn Haewsantati
• Kanda Supapunt
• Kannika Homdungsri
• Kanokwan Boonsook
• Kanokwan Chongcharoen
• Kanpatom Kasonsuwan
• Kanthaluk Wongmali
• Kanyaphach Armart
• Kathawut Thamthinthai
• Ketvalee Yongram
• Khamphee Karwan
• Kitinan Pongsangangan
• Kitti Wirotrattanaphaphisan
• Kittikhun Seawsakul
• Kittikul Kovitanggoon
• Kittipat Malakit
• Kittipitch Yooprasertchuti
• Kittiwat Tangmongkollert
• Komsilp Kotmool
• Konlayut Deejing
• kriangsak kraiwattanawong
• Kulaya Keawsang-in
• Kullawat Inthaud
• Kwuanfa Mahasith
• Lunchakorn Tannukij
• Mali Nachaisin
• Manus Boonmalai
• Matthew J. Lake
• Meena Noinongyao
• Mongkol Sapankaew
• Nakorn Henjongchom
• Nampueng Pangpaiboon
• Napaporn A-thano
• Napasorn Jongjittanon
• Naphatsorn Kulsayumporn
• Narenrit Thananusak
• Narumon Suwonjandee
• Nattapong Yongram
• Nattawat Kulrat
• Nattaya Srikhamwiang
• Natthawat Damrongrak
• Nawarat Seetapong
• Netnapha Limphaiboon
• Nipatta Noona
• Nipon Gasiprong
• Noppakorn Thanamoon
• Numpong Punyaratabandhu
• Nuntanut Wattanasupinyo
• Nuttapon Sriphathoorat
• Paichayon Tongsin
• Pakawee Surarittikul
• Pakorn Preechaburana
• Panida Cen
• Papaporn Jantawongrit
• Paparin Jamlongkul
• Parinya Namwongsa
• Patapong Panpiboon
• Patipan Uttayarat
• Patompong Chananil
• Pattama Khamsuk
• Pattaranipa Gunhakoon
• Peera Champathet
• Peera Pongkitiwanichakul
• Phakkhananan Pakawanit
• Phannee Saengkaew
• Phat Srimanobhas
• PHITSAMAI KAMONPHA
• Phongnared Boontueng
• Phum Siriviboon
• Pichitchai Pimpang
• Pimpunyawat Tummuangpak
• Piriya Praneekit
• Pitayuth Wongjun
• Pitchanunt Chaiyo
• pitchpilai khoonphannarai
• Pitshaya Praigaew
• Piyamas Choochalerm
• Piyaporn Sarasee
• Ploypailin Leelanoi
• Pollawat Damrongkitpakorn
• Pongsaran Chimsiri
• Poonnaphob Sopapan
• Pornchai Chinnasa
• Pornchai Kopatta
• Pornjuk Srepusharawoot
• PORNSAWAN SIKAM
• Porramain Porjai
• Praween Singsaksri
• Prayoonsak Pluengphon
• Preeda Patcharamaneepakorn
• Preeyabol Suwannakrua
• Pruet Kalasuwan
• Prutchayawoot Thopan
• Punchanok Chompu
• Purit Quinram
• Puttarak Jai-akson
• Rachsak Sakdanuphab
• Raewat Laopaiboon
• Rakpong Saikaew
• Ramida Chaiyarat
• Ratchanikorn Koomramyakul
• Ratchaphat Nakarachinda
• Rattakarn Yensano
• Rattanaporn Somrith
• Rinda Sangyaw
• Ronald Macatangay
• Sakdithut Jitpienka
• Samuk Pimanpang
• Sanpet Nilphai
• Sarunya Chomchaiya
• Sarunya Seechalee
• Sasithorn Srirattanapibul
• Sataporn Sapa
• Sathaporn Srilakhondee
• Satja Saisuwan
• SATSAWAT SONSUNAN
• Sawanya Boonchuay
• Sikharet Pawasay
• Singkarn Chanprateep
• Sirithip Yingphaiboonsuk
• Siriyaporn Sangaroon
• Sitichoke Amnuanpol
• Sittipong Komin
• Sittiporn Dueantakhu
• Somkid Pencharee
• Somkuan Photharin
• Somphoach Saichaemchan
• Somsak Dangtip
• Somyod Denchitcharoen
• Sornthep Vannarat
• Sukanya Nutaro
• Sumalee Waiyarod
• Supaluck Amloy
• SUPATTRA Wongsriya
• Supharat Charoensiri
• Suphattra Sachana
• Suppanat Supanyo
• Supree Pinitsoontorn
• Surapat Ek-In
• Suriyong Pongpaiboonkul
• Suthasinee Somboonsap
• Suwaphat Boonphasuk
• Suwicha Wannawichian
• Taewan Pleansaithong
• Takeuchi Shingo
• Takol Tangphati
• Tanachai Ponken
• Tanchanok Muifeang
• Tanin Nutaro
• Tanissara Pinijmontree
• Tatphicha Promfu
• Taum Wuthicharn
• Teerapat Lapsirivatkul
• Teerasak Kamwanna
• Teerayut Loylip
• Thana Yeeram
• THANAPORN THUMSA-ARD
• Thanawat Sangtong
• Thanayut Srisuma
• Thanun Chunjaemsri
• Thanundon Kongnok
• Thanyathorn Sangprasert
• Tharathep Plienbumrung
• Thawatchai Sudjai
• Theerapong Puangmali
• Thepprasith Svetatula
• Tinn Thongmeearkom
• Tipaporn Patniboon
• Tippavan Hongkachern
• Tipsuda Chaipiboonwong
• Tosapol Pengsai
• Tossavalai Chanasiriwat
• Trai Unyapoti
• Udom Peanpunga
• Udom Tipparach
• Umporn Wutchana
• Utane Sawangwit
• Vallop Homrahat
• Valluck Teangdah
• Vatcharinkron Mekla
• Veerin Urairat
• Vicharit Yingcharoenrat
• Vichawan Sakulsupich
• Vichayanun Wachirapusitanand
• Vitsanusat Atyotha
• Wachiraporn Choopan
• Wanchalerm Khwammai
• Wantana Sukkaew
• Warakorn Pinpong
• Wararat Treesukrat
• Warisa Pancharoen
• Warut Koonnasoot
• Wasan Pinate
• Wasin Nupangtha
• Wasit Arworn
• Watchara Liewrian
• Watcharawuth Krittinatham
• Watchareeporn Kaewsan
• wichaid ponhan
• Wichapol Dendumrongsup
• Wichean Piwbang
• Wichita Tuisakda
• Wijit Choawunklang
• Wirunti Pungtrakoon
• Wisanu Pecharapa
• Wisit Tamseewan
• Witoon Moonpat
• Wiwittawin Sukmas
• Worakrit Thida
• Woramon Sawasdee
• Worapot Prongmanee
• Yingyot Infahsaeng
• Yotawee Subthira
• Yotsathorn Pholrong
• Yuthana Thana
• Yuttapun Khamwun
• Yutthachai Jaichueai
Support
• Wednesday, 8 June
• 07:55 08:30
Registration Jitta Spa

#### Jitta Spa

registration at the front desk

• 08:30 09:00
Opening Ceremony 1 (Jitta Spa)

### 1

#### Jitta Spa

• 09:00 09:40
Plenary Lecture I 1 (Jitta Spa)

### 1

#### Jitta Spa

• 09:40 10:20
Plenary Lecture II 1 (Jitta Spa)

### 1

#### Jitta Spa

• 10:20 11:00
Coffee break 40m

Morning coffee break

• 11:00 12:30
Session III: Tr.7 High energy and Particles Physics Room Anek

### Room Anek

• 11:00
Non-standard Light Yukawas and Higgs Portal 30m
Speaker: Dr PATIPAN UTTAYARAT (SWU)
• 11:30
QED Photon-Photon Scattering 15m

The QED scattering amplitude and cross section of $\gamma \gamma \rightarrow \gamma \gamma \gamma \gamma$ are calculated. The lowest order of this process appears in sixth order of the S-Matrix in which each photon interact with the other by creation of pair massive virtual fermions in the vacuum. This can be applied to calculation of the sixth-rank vacuum polarization tensor vector boson.

Speaker: Mr Suppanat Supanyo (Mahidol University)
• 11:45
The Calculation of Transition Amplitudes of Some Interactions among Electrons, Positrons, and Photons 15m

This project aims to study the possibility of some interactions among three types of particles, i.e., electrons, positrons, and photons, from quantum perspective. The transition amplitudes of which the squares are occurring probability for some interactions are investigated. Despite having a simple method of Feynman diagram and Feynman rule, in this work, the transition amplitudes are calculated from foundational assumptions of quantum field theory (QFT) by mean of the quantum electrodynamics interaction operator, S operator, expansion. It is found that the second order S operator predicts the existence of interactions with non-vanishing transition amplitude, for example, electron-position scattering, electron-position annihilation and pair-production, electron-photon scattering, and positron-photon scattering.

Speaker: Mr Kitinan Pongsangangan (Department of Physics, Khon Kaen University, Thailand)
• 12:00
A new charm quark tagging algorithm at the CMS detector. 15m

At the Compact Muon Solenoid (CMS), both Standard Model (SM) and Beyond Standard Model (BSM) physics processes can result the final states with charm quark jets. Charm quarks hadronize to D mesons which could travel some distance in the CMS silicon tracker before decaying into showers of detectable particles, called jets. Consequently, 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-tagging. C-tagging uses multivariate analysis (MVA) techniques 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-tagging algorithm is integrated into the CMS software (CMSSW). It will be used in supersymmetry (SUSY) searches for new particles such as stop (${\tilde t}$), 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 2015 and 2016.

Speaker: Kittikul Kovitanggoon (Chulalongkorn (TH))
• 12:15
Search for a Narrow Resonance Produced in 13 TeV pp Collisions Decaying to Electron Pair or Muon Pair Final States 15m

A search for a new narrow resonance decaying to an electron pair or a muon pair is performed using 13 TeV pp collision data collected by the CMS experiment at the CERN. The electron event sample used corresponds to an integrated luminosity of 2.6 fb$^{-1}$ while the muon event sample used corresponds to an integrated luminosity of 2.8 fb$^{-1}$. No evidence for such a resonance is observed and limits are set at the 95% confidence level on a new massive narrow spin 1 boson decaying into electron or muon pairs. These limits exclude a sequential standard model $\rm Z'_{SSM}$ resonance with a mass lighter than 3.15 TeV and superstring-inspired $\rm Z'_{\psi}$ with a mass lighter than 2.60 TeV.

Speaker: Dr Gurpreet Singh Chahal (Chulalongkorn (TH))
• 11:00 12:30
Session IV: Tr. 11 Materials Physics, Nano Tech. Room Th

### Room Th

• 11:00
An Application of Synchrotron-based X-ray Absorption Spectroscopy Study on Advanced Functional Materials 30m
Speaker: PINIT KIDKHUNTHOD
• 11:30
Lepidocrocite titanate microcrystals as a platform for constructing two-dimensional (2D) nanomaterials and related structures 30m

Invited Speaker

Speaker: TOSAPOL MALUANGNONT
• 12:00
Photo Detection in Single-Walled Carbon Nanotube Field-Effect Transistors Assembled by AC Dielectrophoresis 15m

Carbon nanotubes have long been attracted much consideration as novel materials that are potentially applicable for making a wide variety of nanoelectronic devices. Due to their remarkable electronic properties, carbon nanotubes have been considered to be intelligent material that could make revolution in optoelectronic science. In this research, we reported experimental results of photocurrent measurements in single-walled carbon nanotube (SWCNT) field-effect transistors (FETs) assembled by AC dielectrophoresis method. Our SWCNTs-FET devices were prepared from high purity SWCNTs dispersed in toluene and then aligned in 3 micron gaps of Pd/Pd and Pd/Al electrodes. By using high-frequency AC voltage, a sharp ended side of each pair of the electrodes was used to produce non-uniform electric field to contact a few individual SWCNTs to make conducting channel of FETs. I-V characteristics were taken in two different electrode contacts (Pd/Pd and Pd/Al) to create built-in bias potential due to metal contact work functions. The results showed that nonlinearity of I-V curves was found in Pd/Pd electrode. In contrast to Pd/Al electrodes, diode-like behavior was presented. Charge carriers in conducting channel can be tuned due to application of gate voltage and hence field effect mobility was calculated in order of $\: \text{10}^5 \: \text{cm}^2/\text{Vs} \:$ in individual SWCNT model. Photocurrent measurement was performed by using a board wavelength (200-2500 nm) light source. We found that photocurrent was increased by increasing light-source power up to 200 W due to electron-hole pair creation process in the semiconducting SWCNT (s-SWNTs). The relationship between photocurrent and light-source power was found to be exponential grow which is different from linearity in thin-film s-SWCNTs. Photoresponsivity of the detection was calculated up to 250 A/W while quantum efficiency was found as 380% at a fixed source-drain bias voltage. This study presents the fundamental fabrication along with the photoexcitation measurements in a semiconducting single-walled carbon nanotube field-effect transistor using simple and low cost technique. Our results indicate an important implication in future nanoelectronic devices.

Speaker: Mr Mongkol Sapankaew (Department of Physics, Faculty of Science, Mahidol University)
• 12:15
Photocurrent measurement in thin-film single-walled carbon nanotube field-effect transistors 15m

A thin-film single-walled carbon nanotube (SWCNT) has been fabricated as a field-effect transistor (FET) for a photodetector at room temperature. We used suspended SWCNTs in Toluene solution in order to assembly into a micrometer-gap size of Aluminum microelectrodes on SiO2/Si substrate by dielectrophoresis technique. The assembled SWCNTs form a layered SWCNTs network that bridged between the aluminum microelectrodes of up to 120 $\mu$m long, acting as a conduction channel of the transistor. We performed photoexcitation measurements of this SWCNT thin film by illuminating Quartz Tungsten Halogen light source with broad wavelengths ($\lambda$ ~ 200 - 2500 nm). The measured current was as a result of electron-hole pair creations due to multi-subband energy absorptions of the nanotubes and could be detected by electrical transport measurement up to room temperature. The excited charge carriers in the SWCNTs by increasing light emission power up to 250 W was found linearly dependence of the power, whereas in the individual SWCNT-FET device it shows as a power-law dependence at a given source-drain bias. This linear growth of light intensity was contributed to electron-phonon scattering between bundles of nanotubes and heat dissipation among them. In a comparison with a single conductive FET channel, the measured parallel FET channels exhibit a higher trans-conductance. However, the measured current of both devices shows small increases with light powers when applying gate biases and saturates at a high power. We demonstrated that the carbon nanotube materials can be used for light sensor application or energy harvesting materials for low-power consumption technology. This research can be mostly conducted in Thailand

Speaker: Mr Weerapad Dumnernpanich (Mahidol university)
• 11:00 12:30
Session V: Tr. 8 Instrumentation, Metrology and Standards Room E1

### Room E1

• 11:00
Cooling Energy Distribution of Secondary Ions at the Travelling-wave Ion Guide by Helium and Molecular Nitrogen 15m

The Ar-cluster ion source at energy in order of keV was installed with the Q-ToF (Quadrupole Time-of-Flight) premier at the Quantum Science and Engineering Center, Kyoto University. The main component of Q-ToF premier consists of the travelling-wave ion guide, mass filter quadrupole lens, travelling-wave collision cell, and time of flight analyzer. The 1,2-Distearoyl-sn-glycero-3-phosphocholine (DSPC) sample was used to analyze the cooling energy distribution at the travelling-wave ion guide by helium and molecular nitrogen. The DSPC sample was impinged with primary Ar-cluster ions at energy 10 keV and sputtered with secondary ions in energy range from zero to several hundred eV. Sputtered or secondary ions were extracted to the Q-ToF mass spectrometer. The experiment was designed to measure the DSPC mass spectrum in two modes at varied pressures of helium and molecular nitrogen. The first mode was MS mode and the other was MSMS mode which defined the m/z = 790.6 Da, molecular protonated, at the mass filter quadrupole lens. The experiment found that the secondary ion yield (SIY) of the MS mode reached the maximum at 2.0 and 0.4 Pa for helium and molecular nitrogen, respectively. At the MSMS mode, the SIY reached the maximum at 2.5 and 0.4 for helium and molecular nitrogen, respectively. However, in the MSMS mode, some fragments could not be eliminated by the cooling molecular nitrogen. The helium cooling energy distribution and the transverse direction of secondary ions were more effective and stable than molecular nitrogen.

Keywords: Ar-cluster ion source, Q-ToF, 1,2-Distearoyl-sn-glycero-3-phosphocholine (DSPC), MS mode, MSMS mode.

Speaker: Mr Prutchayawoot Thopan (Chiang Mai University)
• 11:15
Effect of Liquid Viscosity on Particle Equilibrium Position in Straight Microchannel 15m

The flow of suspended particle in various fluid viscosities was investigated in this study. The particles in viscous fluid flow are affected by transverse inertial force and shear lift force, so their equilibrium position will be located where these forces balance. The straight 200x100 µm2 cross section, 5 cm long microfluidic device used in this study was fabricated using printed circuit board technique. The 10 micron polystyrene microspheres suspended in propylene glycol with various viscosities solution were used in determining effect of liquid viscosity on particles equilibrium position. The computational fluid dynamic simulation was carried out to calculate particle equilibrium position and compare with experimental result. Since small volume fluid is needed in microfluidic experiment, the device can used to determine viscosity of small amount unknown liquid.

Speaker: Mr Kullawat Inthaud (Department of Physics and Materials Science, Faculty of Sciences Chiang Mai University, 239 Huay Kaew Road, Muang District, Chiang Mai, Thailand, 50200)
• 11:30
Development of mobile photometer for DNA quantitation using UV-LED. 15m

Light as electromagnetic wave when travelling through a liquid solution, it could perturb and interact with molecules in that solution. DNA absorbs light specifically at 260 nm. The absorbance is related to DNA concentration through Beer-Lambert law of absorption. This relationship is a common basis of DNA quantification in spectrophotometers. A bulky deuterium lamp or halogen lamp is commonly used as 260-nm light source. Their use has limited the mobility of spectrophotometer. UV-LED is an alternative light source with light weight and more compact in size. In this work, we have developed 260-nm LED and a photo-diode as a compact and mobile photometer. At present, the development is still in its early stage. Some experimental results of DNA quantification are reported in this conference.

Speaker: Kathawut Thamthinthai (Mahidol University)
• 11:45
Temporal change in flatness of flat surface due to optical mounting and gravity 15m

In the process of measuring flatness, there are many parameters that affect accuracy of the measurement. This paper investigated temporal change in flatness of flat surface due to optical mounting and gravity. Flatness and topography of flat surface diameter range from 60 mm to 300 mm were recorded and evaluated by using Fizeau interferometer. Differences in mounting and geometry of the optical flat lead to difference in stabilization time. The experiments were carried out from the beginning of optical flat mounting vertically while the optical flats were initially kept in horizontal orientation. The temporal study was evaluated from 8 positions along X-axis and Y-axis. The experiment results show that with three-points mounting, stabilization time required is longer than the sling type. Moreover, large (heavy) optical flat also presented bigger temporal change which is not only come from size but also environmental condition.

• 12:00
Effect of Liquid Viscosity on Particle Equilibrium Position in straight microfluidic channel 15m

The fluid mechanics of single-phase flow with relatively viscosity in straight microfluidic channel was investigated experimentally. The adopted technique is based on particle migration phenomenon occurring when fluid with 10 micron diameter particles flow in straight 200 micron width 100 micron height microfluidic channel. The method is applied to find equilibrium position of the particles in propylene glycol solution at various ranges of viscosity. The objective is to find relationship of particle equilibrium position with viscosity. The result is compared with computational simulation for particle equilibrium position. The particles in viscosity fluid flow are affected by initial force and velocity gradient. The particles equilibrium position locate where those force balance.

Speaker: Mr Kullawat Inthaud (Chiang Mai University)
• 11:00 12:30
Session VI: Tr. 4 Biological Physics Room E2

### Room E2

• 11:00
Nucleation of Hydroxyapatite and Protein Crystals on Rough Surface 30m
Speaker: Dr Piyapong Asanithi ((1)Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand (2)ThEP Center, Commission of Higher Education, 328 Si Ayuthaya Rd, Thailand)
• 11:30
Computational Microscopy of Nanoparticle-Biomembrane Interactions: Insights into Nanotoxicology and Nanomedicine 30m

Invited Speaker

Speaker: Theerapong Puangmali
• 12:00
Filtration of Electrically Neutral Macromolecules through Glomerular Capillary Wall 15m

The main function of human kidneys is to filter blood and remove metabolic waste while retaining the normal blood composition and volume. The first step of this process is blood filtration through glomerular capillary wall; a membrane consists of multiple layers: endothelium cell layer, the glomerular basement membrane (GBM) and the epithelial foot processes with their interconnecting slit diaphragm. This work focuses on a hydrodynamic model describing hindered transport of electrically neutral macromolecules through the slit diaphragm and the glomerular basement membrane (GBM). The glomerular basement membrane was modeled as a medium consisting of two fibers, collagen type IV and glycoaminoglycan, whereas the epithelial slit was modeled as a row of parallel cylindrical fibers. The non-uniform cylinder spacing is assumed to follow the gamma distribution. The mean value of the spacing and its standard deviation are calculated from the experimentally obtained hydraulic permeability using the Newton-Raphson's method. The averaged sieving coefficients through the slit diaphragm are calculated by using this distribution function and are combined with the sieving coefficients through GBM to find total sieving coefficients. Results are found to agree very well with total sieving coefficients of Ficoll solutes obtained experimentally. Effects of physiological change observed in patients with membranous nephropathy on glomerular size-selectivity are also investigated.

Speaker: Mr Numpong Punyaratabandhu (Department of Physics, Faculty of Science, Chulalongkorn University)
• 12:15
Designing Gold Nanoparticle Translocation through Cell Membrane for the Applications in Nanomedicine 15m

The study of the interaction between nanoparticles and living cell is the fundamental study that can be applied for the efficient drug delivery. In this work, we aim to study and design gold nanoparticles (AuNPs) for the drug delivery by a computer simulation. Computationally, the interaction between AuNPs and cell membrane was studied by coarse-grained molecular dynamic simulation which is suitable for a large complex system. The studied parameters are sizes, varied from 2 nm to 10 nm in diameter, and shapes including (i) spherical NP, (ii) nanorod and (iii) hexapod. The results show that, for sphere-shaped NP, small nanoparticles (2-8 nm in diameter) tend to penetrate across cellular membrane via direct translocation. Whereas, the 10-nm-in-diameter NP is able to form the vesicle (endosome) leading to non-specific endocytosis. Unlike the spherical NPs, rod-shaped and hexapod-shaped NPs are unable to perform endocytosis even they have exactly the same diameter as the spherical counterpart. Our findings are very crucial and will pave the way for the design of the targeted drug delivery.

Keywords : Cellular uptake: Gold nanoparticles (AuNPs): Endocytosis: Size and shape effect

References

[1] Ding Hm, Ma Yq. 2015. “Theoretical and Computational Investigations of Nanoparticle–Biomembrane Interactions in Cellular Delivery”. Small. 2015;11(9-10):1055–1071.

[2] Zhang S, Gao H, Bao G. 2015. “Physical Principles of Nanoparticle Cellular Endocytosis”. ACS Nano. 2015;9(9):8655–8671.

[3] Yang X, Yang M, Pang B, Vara M, Xia Y. 2015. “Gold Nanomaterials at Work in Biomedicine”. Chemical Reviews. 2015;115(19):10410–10488. PMID: 26293344.

[4] Nangia S, Sureshkumar R. 2012. “Effects of Nanoparticle Charge and Shape Anisotropy on Translocation through Cell Membranes”. Langmuir. 2012;28(51): 17666–17671.

Speaker: Mr Jirawat Assawakhajornsak (Department of Physics, Faculty of Science, Khonkean Univiersity, Maung district, Khonkean province, 40002)
• 11:00 12:30
session I: Tr. 2 Astronomy, Astrophysics and Cosmology Room J1

### Room J1

Astronomy&Astrophyiscs

Convener: Alejandro Saiz Rivera (Mahidol University)
• 11:00
Neutron Monitor Research in Thailand 30m

A neutron monitor (NM) detects atmospheric secondary particles, mostly neutrons, due to cosmic rays, i.e., energetic particles from space. The main goal of an NM is to track time variations in the cosmic ray flux to high precision, over time scales from minutes to decades. These time variations are due to effects of the solar wind and solar storms, both of which vary with the 11-year sunspot cycle and/or the 22-year solar magnetic cycle. This talk summarizes NM research in Thailand, including the establishment of the Princess Sirindhorn Neutron Monitor (PSNM) at the summit of Doi Inthanon, and analysis of data from PSNM and other NMs worldwide. We have explained trains of enhanced daily variation at PSNM in terms of the cosmic ray anisotropy associated with high-speed solar wind streams. We analyzed data from a ship-borne NM operated by a US-Australian collaboration during 1994-2007, and confirmed a change in the cosmic ray spectrum due to a solar magnetic polarity reversal. We have developed Monte Carlo simulations of cosmic ray showers in the atmosphere and secondary particle interactions in an NM. Using a portable calibration NM from South Africa, we measured the effects of the PSNM building on the calibrator count rate and explained them in terms of Monte Carlo results. We also developed a new capability for a single NM station (PSNM) to track short-term variations in the cosmic ray spectrum, not only the cosmic ray flux, and show data on different spectral responses to different solar storms. Finally, we discuss our modeling of data from polar NMs to determine the emission of relativistic solar particles from the giant solar storm of 2005 Jan 20, which enhanced Earth’s radiation environment by 50 times in some locations, and we discuss the effects of major solar storms on human economic activity.

Speaker: David Ruffolo (Mahidol University)
• 11:30
Earth’s gamma-ray emission in geographical coordinates with Fermi-LAT data 15m

The Earth’s gamma ray emission is produced from the interactions between cosmic rays (CRs), high-energy particles in space, and the Earth’s upper atmosphere. These gamma rays are measured by the Large Area telescope (LAT), the instrument onboard the Fermi Gamma-ray Space Telescope (Fermi) which was launched in 2008 to orbit the Earth at the altitude of ~540 km. Here we present preliminary results of the Earth’s gamma ray intensity, which for the first time has been analyzed in geographical coordinates, using the latest version of LAT data. This study will provide better understanding of the geomagnetic field, the Earth’s upper atmosphere, and CRs.

• 11:45
Mapping the Milky Way galaxy from the observation of 21-cm spectral line from HI using SRT 4.5 m of NARIT 15m

In this study, the preliminary results are presented about the studies of kinematics properties of rotation of our galaxy and mapping the Milky Way galaxy only on quadrant I which is observed from the emission lines of neutral hydrogen (HI) at frequency 1420 MHz. Those observed HI clouds lead us to calculate the radial velocity from a shift in frequency of HI’s cloud which is called Doppler effect. The radial velocities are used to calculate rotational velocities for plotting galaxy rotation curve and mapping Milky Way galaxy. The rotation curve of galaxy shows the value almost flat curve with increasing the distances. Moreover, the result of graph is used to study the distribution of mass in our galaxy. Scope of the study, HI spectrum is observed at galactic latitude 0° and from galactic longitude 25° to 85° with increasing 5° in each step. The parameter are used in this calculation as follows; the Sun’s velocity obits around the Galactic center is equal to 225 ±5 km/s and the Sun’s distance from Galactic center is equal to 8.34 ± 0.34 kpc respectively. We have used small radio telescope (SRT) of National Astronomical Research Institute of Thailand (NARIT) which has diameter 4.5 m. However, the radio telescope has some trouble in mechanic parts and is preparing to adjust the new receiver system in particular HI frequency. We hope to finish observation in the end of year 2016.

Speaker: Mr Attasit Phakam (Khon Kaen University)
• 12:00
The study of Jupiter's aurora : bright spot variation in active region 15m

Jupiter’ polar emission is a part of Jovian’s aurora features that still receives debates about its origin and behavior of brightness which seem to be unstable. In this work, we study Jupiter’s polar emissions on May 13th 2007 observed by Advanced Camera for Surveys (ACS) camera on board the Hubble Space Telescope. We found that active region, which is a section of the polar region, appeared to have a bright spot at time of observations. After the detection of bright auroral spot, the auroral emission in active region became very faint, while reappeared again within about 20 minutes. This reappearing of auroral emission is similar to the behavior of Earth’s aurora. The bright spots from two consecutive observations occurred at the same location corresponding to system III longitude, about 62 degrees latitude and 174 degrees longitude. The field line tracing from the ionosphere to magnetosphere based on VIP4 model, which was used to map the auroral emission in ionosphere to the origin of auroral particles in magnetosphere, showed that the mapping region ranging approximately between 80-90 RJ. Moreover, the Michigan Solar Wind Model, MsWim, which is developed at the University of Michigan, showed that on May 13th 2007 solar wind speed built up nearly at the time we found a bright spot. As a result, the possible explanation for this behavior could be the effect by the increasing of solar wind dynamic pressure. In addition the brightening cycle of bright spot suggests the possibility of growth and relaxation states similar to the behavior of Earth’s aurora.

Keywords : Jupiter’s aurora, active region, solar wind

Speaker: Ms Kamolporn Haewsantati
• 12:15
Earth's auroral activity at polar region in responding to solar wind dynamic 15m

The occurrence region of the Earth’s aurora is mostly near the pole. The terrestrial aurora has a feature of emission band, which locates around geomagnetic latitude between 61 and 73 degrees. The appearance of the aurora is not in a stable form but changing with time. This study presents three periods of Earth’s auroral activity on April 28th, 2007, which was observed by the Visible Imaging System (VIS) cameras on board POLAR spacecraft. The image size is 256×256 pixels, which was taken in 12 second of exposure time during the Global Geospace Science (GGS) program. The analysis of auroral activity shows that the brightening zone of the auroral oval changes with various time scales. To compare with the model of auroral activity over the entire polar region, there are two characteristic phases around 2~3 hours, an expansive phase and a recovery phase (Akasofu, 1964). In addition, the solar wind data, which are interplanetary magnetic field (IMF), Earth’s magnetic field, solar wind plasma speed, and solar wind proton density will be used to determine the corresponding of auroral activity to solar wind dynamic in each phase. From this study, the various cases of terrestrial auroral activity will be presented.

Keywords: auroral activity, solar wind dynamics

Speaker: Paparin Jamlongkul
• 11:00 12:30
session II: Tr. 12 Nuclear and Radiation Physics Tr. 13 Optics, Nonlinear Optics Room J3

### Room J3

• 11:00
A model for predicting tritium flux from blanket mock-up in Tokamak fusion reactors 15m
The tritium is considered as one of main fuels for D-T nuclear fusion reactors, where it is planned to be produced from a blanket of reactors by using the interactions between 14.1 MeV neutrons from nuclear fusion reactions and lithium from the blankets. In this work, the simulations of the tritium production from mock-up breeding blanket due to interactions of neutrons and lithium in the blanket are carried out using the Monte Carlo N-Particle transport code (MCNP) version MCNPX. Four designs of mock-up breeding blanket, including a design with a pure natural lithium, a design with lithium titanate (Li2Ti03) based compound, a design with a compound based on a combination of a pure natural lithium and thorium, and a design with a compound based on a combination of lithium titanate and thorium. It is found that the production of tritium significantly increases with the inclusion of thorium, where an increase of tritium production with a factor of 2 can be achieved.
Speaker: Dr Siriyaporn Sangaroon (Department of Physics, Mahasarakham University, Mahasarakham, Thailand)
• 11:15
The characterization of the liquid scintillator detector for the PGNAA system at TRR-1/ M1 with MCNP 15m
The aim of this work is to optimize and characterize the liquid scintillator detector, that will use for the mixed n/ radiation field at the Prompt Gamm-ray Neutron Activation Analysis System (PGNAA) at the Thai Research Reactor (TRR-1/M1). The study was carried out using the Monte Carlo N-Particle code (MCNP). The model of the liquid scintillator consists of the aluminum housing, thick 0.085 cm, and the scintillation material. The scintillation layers were varied with the difference thicknesses between 1 cm to 5 cm and the surface area of 20.09 cm2. The neutron and photon response functions for a mono-energetics energies were obtained. The results show that the detection capability depends on the scintillator thickness. In addition, the resolution function of the scintillator was reported and folded to the response function. The neutron detection efficiencies were calculated and compared to the theoretical one. The results show that the detection efficiencies were affected by the detector thickness and the energy threshold. The detector diameter (e.g. thickness, radius) will be suggested and purposed to the experimental at the PGNAA system in the future. Keywords: liquid scintillator, MCNP, response function, detection efficiency
Speaker: Ms Ploypailin Leelanoi (Faculty of Science, Mahasarakham University, Kantarawichaia District, Mahasarakham 44150 Thailand)
• 11:30
Evaluation of radiation dose from powder and bulk hydroxyapatite for routine dosimeter 15m
The aim of this study is to analyze the interaction of gamma radiation with powder and bulk hydroxyapatite synthesized from quail eggshell at various doses for development hydroxyapatite as a routine dosimeter. The powder and bulk of hydroxyapatite were irradiated with gamma from 0.1 kGy to 10 kGy. Electron spin resonance (ESR) spectroscopy was used to determine and evaluate dose response from characteristic signal. The center peak group of both ESR signals was occurred g-value at 2.0029, 2.0022, 2.0018 and 1.9986 that indicated the radiation induced inorganic free radicals of 4 molecule ions as CO-, CO2-, CO33- and CO2-, respectively. The correlation between the intensity of ESR signal with the dose response of bulk hydroxyapatite was good polynomial function in range 0.2 kGy to 2 kGy. Furthermore, the free radicals stability of hydroxyapatite during 45 - 90 days after irradiated showed a small decay about 25%. These results have shown that the bulk hydroxyapatite from quail eggshell could be used a good and easily routine dosimeter for high dose.
Speaker: Ms Kanokwan Boonsook (King Mongkut's University of Technology Thonburi (KMUTT))
• 11:45
An optical diagnostic technique for laser removal of graffiti 15m

In this paper, we propose an optical surface measurement based on laser scattering to monitor situ the laser cleaning threshold for the removal of graffiti. This technique is meant to assist the laser removal process using laser pulses of 10 ns at 1064 nm while probing the weak laser beam at 632 nm. The diagnostic apparatus consists of a HeNe laser performing a probing light source and photodiodes. A polarizing beamsplitting cube is used to split the probe beam into two separate beams which are called the reference beam and the sample beam. The reference beam is sent to the unaffected graffiti surface while the sample beam is incident on the affected graffiti surface. The spots of the two probe beams on the surfaces are imaged onto photodiodes. In this approach, the signals detected by photodiodes can be analyzed and indicated the laser cleaning threshold. A setup of angular laser cleaning allows the simplicity of this optical measurement. For this study, the use of a Q-switch Nd:YAG laser operating at 1 Hz was investigated. By mean of the Z-scan method, the laser fluence of the laser cleaning beam can be varied. The sample under investigation is irradiated by the Z-scan laser beam achieved by the scanning lens. The level of laser cleaning has been also determined through the optical setup. The laser removal of graffiti from mortars under dry and wet conditions was attempted to examine the cleaning procedures. The results obtained by this demonstration have proven to be a reliable technique for an online surface inspection for laser cleaning applications. Furthermore, this optical diagnostic technique can allow a variety of interesting applications for laser cleaning technology.

Speaker: Ms Jidapa Rattanarojpan (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Group (LANDOS), Science and Technology Institute. King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
• 12:00
An Off-Axis Laser Recirculation 15m

This paper presents a development of an optical arrangement that captures photons traveling in the multi-pass fashion based on a so-called laser recirculation. An optical trapping scheme is relied on the principle of nonlinear frequency conversion. In this demonstration, a L-shape resonator performing as the master cavity provides a laser beam with a fundamental frequency to create the frequency-doubled photon. The frequency-doubled laser beam is trapped inside the slave cavity which is designed to be an off-axis resonator. A retroreflector allows the off-axis configuration of the slave cavity. The alignment and trip of the photons was governed by lenses and mirrors of the slave cavity. To prove this novel concept, the demonstration is achieved by using a Quasi-CW pumped Nd:YAG laser at 1064 nm. In the master cavity, this fundamental frequency beam is incident on a nonlinear crystal (OPO) placed inside the cavity to generate the frequency-doubled laser beam at 532 nm. The frequency-double laser beam is then trapped inside the slave cavity. The retroreflector controls the trajectory of such a beam. A lens telescope is placed inside the slave cavity to collimate the laser beam. Using this off-axis laser recirculation, the interference problem can be alleviated. The optical setup is also insensitive to environmental vibration that allows to be operated in a hostile environment. Using an optical ray tracing program, the effective mode volume for the slave cavity can be calculated. The simulation can also predict the maximum roundtrips for various situations. The off-axis laser recirculation shows the promise of the simple robust and reliable multi-pass optical cavity which is suitable for laser spectroscopy and optical switching applications.

Speaker: Mr Akanit Nisup (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Group (LANDOS), Science and Technology Institute. King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
• 12:15
Surface Plasmon Resonance Refractometers Based on Smart Phone Platforms 15m

Abstract

Herein we demonstrate the surface plasmon resonance (SPR) refractometers based on smart phone platforms. The optical element used in this system is a single disposable device, which is configures to use conditioned illumination and optical detection from smart phone cameras. The SPR sensing element is fabricated by a soda lime glass slide coated with 50 nm gold film covered by the custom made epoxy resin flow cell. The performance of the smart phone-base SPR refractometers was evaluated by detecting the ethanol/water solutions with different concentrations ranging from 0% to 40% with 10% interval. The results demonstrate that our smart phone-base SPR refractometers is feasible to measure the refractive index of liquid sample and offer an attractive possibility in many applications such as health and environment monitoring.

Keywords: Surface plasmon resonance, Sensor, Optical sensing, Refractometer, Mobile Phone

￼￼￼￼

Speaker: Ms Sawanya Boonchuay (Department of Physics, Faculty of Science and Technology, Thammasat University)
• 12:30 13:30
Lunch time 1h

Lunch for all

• 13:30 15:30
Session IX: Tr.7 High energy and Particles Physics Room Anek

### Room Anek

Convener: Dr PATIPAN UTTAYARAT (SWU)
• 13:30
GEOMETRY DESCRIPTION OF ALICE INNER TRACKING SYSTEM UPGRADE 15m

The purpose of this research is to generate the detailed geometry of the inner barrels of the inner tracking system (ITS) upgrade at ALICE, CERN. The new ITS are divided into two parts, inner and outer barrels. Each part consists of detector barrels and service barrels. The scope of our work is limited to detector barrels and DC to DC power supply of the inner barrels, using AliROOT framework. The geometry is written in C++ programming language and compiled to “.root” files. These files can be used in the simulation process of the experiments and in the calculation of material budgets.

Speaker: Parinya Namwongsa (Suranaree University of Technology (TH))
• 13:45
Projected Search for Physics Beyond the Standard Model in Proton-Proton Collisions with the Monojet Signature from the Future Circular Collider at $\sqrt{s}$ = 100 TeV 15m

We study the potential of the Future Circular Collider detector for hadron collisions to prospect the search for physics beyond the standard model at a centre-of-mass energy of 100 TeV. The study includes signals from large extra dimensions and dark matter production in events comprising a hadronic jet and an imbalance of transverse momentum. Background samples, including $W/Z + jets$, $t\bar{t}$, and QCD dijet, are obtained from "HepSim repository with Monte Carlo predictions for High Energy Physics experiments". Signal events are generated using the PYTHIA8 for the extra dimensions model and the MADGRAPH5 for the dark matter model. Detector simulation is produced by the DELPHES fast detector simulation. The data are normalized to an integrated luminosity of 1 ab$^{-1}$ which corresponds to an expected operation of the Future Circular Collider in a year. Expected limits are placed on the new Planck's scale $M_D$ for the extra dimensions model and the contact interaction $\Lambda$ for the dark matter model.

Speaker: Mr Surapat Ek-In (Mahidol University)
• 14:00
Reconstruction of Standard Model top and anti top quarks from simulated pp collisions with $\sqrt{s}$ = 13 TeV 15m

A reconstruction for the Standard Model top and antitop quarks is conducted via analysing simulated proton-proton collisions at centre-of-mass energy of 13 TeV. MadGraph Monte-Carlo event generator is used, along with DELPHES detector simulator, and recorded using ROOT data format. The generated events contain one million collision events, which contains $t \bar{t} \rightarrow WbWb$ decay channel, where each event is comprised of reconstructed and identified physics objects such as jets, muons, and electrons. For this project, hadronic and leptonic decay channels of W bosons are considered. The reconstructed objects are analysed in order to reconstruct masses of top and antitop quark.

Speaker: Vichayanun Wachirapusitanand
• 14:15
Monte Carlo Production Management in CMS Experiment 15m

Monte Carlo (MC) samples are the essential components for almost all particle physics related experimental analyses. These samples are widely used for preparations of physics analyses and for predictions regarding future experiments. The MC production for a large-scale experiment like CMS is a huge effort in which billions of simulated events for thousands of individual physics processes are produced, with different conditions (e.g. detector alignment), different inputs (e.g. parton shower v/s ME generators) and many workflows (e.g. parametrised simulation vs detailed GEANT-based simulation). In 2012, the web-based service Monte Carlo Management (McM) was developed and put in production in order to aggregate the information needed for the configuration and prioritisation of the events production, to ensure the book-keeping and all the processing requests placed by the physics analysis groups as well as to interface with the CMS production infrastructure. This talk describes the strategy followed by the CMS experiment to collect, manage, process and track MC requests, as well as the tools written and deployed to satisfy the MC needs of each physics group with automated computing operations tools.

Speaker: Dr Gurpreet Singh Chahal (Chulalongkorn (TH))
• 14:30
A new mass scale, implications on black hole evaporation and holography 15m

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We consider a new mass scale $M_{T}=(\hbar^{2}\sqrt{\Lambda}/G)^{1/3}$ constructed from dimensional analysis by using $G$, $\hbar$ and $\Lambda$ and discuss its physical interpretation. Based on the Generalized Uncertainty Relation, a black hole with age comparable to the universe would stop radiating when the mass reaches a new mass scale $M'_{T}=c(\hbar/G^{2}\sqrt{\Lambda})^{1/3}$ at which its temperature corresponds to the mass $M_{T}$. Black hole remnants could have masses ranging from a Planck mass to a trillion kilograms. Holography persists even when the uncertainty relation is modified to the Minimum Length Uncertainty Relation (MLUR). The remnant black hole entropy is proportional to the surface area of the black hole in unit of the Planck area in arbitrary noncompact dimensions.

Speaker: Sajuuk E
• 14:45
Mass-varying Massive Gravity with k-essence 15m

Massive gravity, a gravity theory in which a graviton is given a non-zero mass, plays an important role in the late-time cosmology. Due to the inability to provide a non-trivial cosmological solution, a mass-varying massive gravity is introduced by allowing the graviton mass to change accordingly due to an extra scalar field. Unfortunately, the varying graviton mass shrinks in time and thus vanishes trivially at the moment of the late-time expansion. Here we present a new class of mass-varying massive gravity in which the graviton mass is now also a function of a kinetic term of the scalar field. Such a structure is quite remarkable since not only the graviton mass introduces an effective dark energy but there is another contribution which has a chance of being a dark matter candidate. Lastly, the cosmic evolution of this model is investigated through numerical calculations and it can be concluded that the cosmic evolution can alleviate the well-known cosmic coincidence problem.

Speaker: Lunchakorn Tannukij (Mahidol University)
• 15:00
Hawking fluxes and Anomalies in the Rotating Regular Black Holes with the Time-Delay 15m

We are going to calculate the flow of the angular momentum and flux of the Hawking radiation in the rotating regular black hole with the time-delay proposed in arXiv:1510.08828, based on the anomaly cancellation. We first try to reduce the field theories to the infinite two-dimensional massless free models in which the anomaly cancellation method is possible, in the three metrics in arXiv:1510.08828. We demonstrate that the two of them can be reduced. We perform the calculation in these two metrics, and obtain the flow of the angular momentum and flux of the Hawking radiation in these two metrics. Our result involves the three effects:~the quantum gravity effect regularizing the gravity sources of the black holes, the black hole rotation, and the time-delay. Hence our result could be considered to correspond to a more realistic Hawking radiations. (This study has been submitted to arXiv on 15 March, where the given arXiv number is arXiv:1603.04159. This study is going to be submitted to an international journal, Classical and Quantum Gravity soon.)

Speaker: Dr Shingo Takeuchi (Institute of Fundamental Physics, Naresuan University)
• 15:15
Dimensional Reduction of Eleven Dimensional Supergravity on SU(2) Group Manifold and N=4 Gauged Supergravity 15m

The Kaluza-Klein reduction giving rise to four-dimensional N=4, half-maximal SO(4) gauged supergravity of the D = 11 supergravity is mainly studied. Apart from some special cases, a spherical Kaluza-Klein reduction is in general not consistent. There exists, however, an alternative way to provide a consistent Kaluza-Klein reduction. The guaranteed-consistent reduction, known as the Scherk-Schwarz reduction, requires doing the dimensional reduction on a group manifold of some particular Lie group. From the fact that the SU(2) group manifold is topologically S3 embedded in the S7, the Kaluza-Klein reduction involving S3 can be obtained from a group manifold reduction via replacing the two S3 in the reduction ansatz by the two SU(2) group manifolds. The reduction ansatz is guaranteed to be consistent and give some understanding for the consistency of S7 reduction. By this reduction ansatz, solutions in four-dimensional N=4 SO(4) gauged supergravity theory can be embedded in 11-dimensional supergravity.

• 13:30 15:30
Session VII: Tr. 2 Asronomy, Astrophysics and Cosmology Room J1

### Room J1

• 13:30
Introduction to non-minimal derivative coupling to gravity 30m

Invited Speaker

Speaker: Burin Gumjudpai
• 14:00
Neutron detector response to cosmic rays during latitude surveys 15m

The study of the flux, spectrum, and directional distribution of cosmic rays arriving to Earth provides unique information in the fields of Astrophysics and Space Physics. At energies above $\sim 1\,$GeV, the best way to study cosmic rays is by detecting, at ground level, the secondary particles produced by cosmic rays in the atmosphere, including neutrons. One standard type of neutron detector to measure cosmic ray flux and its variations is the neutron monitor, a large instrument composed of gas-filled proportional counters surrounded by a neutron-producing material (such as lead) and neutron moderating/reflecting components (e.g., polyethylene). A network of neutron monitors around the world can provide cosmic ray directional information as well as a measure of the spectrum, thanks to the differences in the Earth's magnetic field acting as a magnet spectrometer. However, difficulties are still found in combining data from different neutron monitors due to local environmental effects and inherent differences in the detector setup. Other ways to study the cosmic ray spectrum include the detailed analysis of distributions of time delays between consecutive neutron counts in a neutron monitor, and the simultaneous detection of neutrons using two kinds of detectors with different energy response at the same location, e.g., a neutron monitor and neutron bare counters (with no lead or polyethylene). These techniques also require callibration nevertheless. In this presentation we discuss results of the operation of a mobile neutron monitor (capable of producing time delay distributions) and neutron bare counters on board a ship during a series of latitude surveys that carried the detectors from the West coast of the USA to the coast of Anctartica and back, thus providing with measurements of cosmic ray flux in a consistent way from near the Earth's magnetic pole to the magnetic equator.

Speaker: Alejandro Saiz (Mahidol University)
• 14:15
Solar and Lunar Eclipses Modeling by Using Minecraft for Elementary Students 15m

Solar and lunar eclipses are astronomical phenomena which is an excellent topic for introducing astronomy to primary school students. We have used Minecraft which is a popular game about placing blocks to construct anything and can make a simple model of the Sun, Moon and Earth easily. The background knowledge of Pratom 6 students (grade 6) has already had about the position of them on Earth and how they see the Sun and Moon. This article will show how students investigate the relationship between Sun, Moon and Earth and when will solar and lunar eclipses occur in their game situation. After class students should draw and write essay about solar and lunar eclipses concept journal. The result will be shown at the conference.

Speakers: Mr Chanvit Junngam (Ubon Ratchathani University), Ms Sirithip Yingphaiboonsuk, Ms Tawinan Rodhiran (Ubon Ratchathani Rajabhat University)
• 14:30
Photometric studies for Color magnitude diagram and Mass distribution of Globular cluster 15m

We present BV Photometry for the globular clusters (GCs) M3 (NGC 5272), M 92(NGC 6341) and M107 (NGC 6171), which are analyzed by Aperture Photometry Tool (APT). All of optical images were taken by 2.4m Telescope at Thai National Observatory in Chiang Mai, Thailand. The magnitudes of stars in three globular clusters were determined. Furthermore, the luminosity of each star was converted based on its BV magnitude, which accordingly relates to color-magnitude diagram (CMD). CMD can describe range of Turn-off point and ages of cluster. In addition, we also use mass-luminosity relation for create mass distribution of three GCs. In this study, CMD of above clusters were analyzed and compared with the result from previous studies by Buonanno, R. et al. (1994), Stetson, Peter B. and Harris William E. (1988) and Ferraro, F. R. et al. (1999). The similar evolution was shown in CMD, although our studies have less point of data. In addition, we used mass-luminosity relation to create mass distribution of three GCs. For M3, M92 and M107 we found that most of stars’ population has mass range between 3.81-4.45 solar mass, 0.98-1.59 solar mass and 1.31-2.50 solar mass respectively.

Keyword: Globular cluster, Color magnitude diagram, mass distribution

Speaker: Ms Piyamas Choochalerm
• 14:45
Detection of Indirect Signal Dark Matter from the Milky Way 15m

We study the prediction of the gamma ray signal generated from Galactic halo dark matter (DM) annihilation. The study focuses on the electron and positron pair production resulting from self-conjugate dark matter particles. We use Milky Way (MW) DM density profile measurement from literatures which are fitted with NFW, Burkett and Einasto models. The most important radiative process in the gamma ray regime is the Inverse Compton Scattering (ICS) of photons by highly energetic electron and positron. We also determine the contribution from Final State Radiation and compare the prediction for different DM masses to the published results from Fermi satellite. We assume electron-positron cross-section <$\sigma\nu$>=$3\times10^{-26} cm^{3}s^{-1}$ which typical value for a thermal relic. Although the cross-section is correlated with DM mass in the measurement from gamma ray spectral distribution, we expect cross-section value that is not higher than typical value for DM with mass of few GeV. According to our results, NFW profile and mass of few GeV are closer to observational data than other profiles and other masses of DM particle.

Speaker: Ms Jaruchit Siripak (Physics)
• 15:00
Photometric reverberation mapping of Quasar HE0345+0056 15m

We have analyzed photometric and spectroscopic data of HE0345+0056 which is an AGN in our ongoing variability monitoring program. Our well defined parent quasar sample is drawn from the Hamburg/ESO survey and observed in several broad- (B,V,R) and narrow-band filters with the Thai Robotic telescope in Chile.Our aim is to use photometric reverberation mapping techniques to study the BLR of our AGNs. Data reduction was done using a python based pipeline we created using publicly available software to extract the photometry in order to create light curves used in our analysis. During our observation in 2014 we have found a change in HE0345+0056 magnitude of approximately 0.1 mag in broadband BVR over 40 days extending from late August to early October (MJD 56880-56920). A follow-up spectroscopy observation started at the same time at the Higashi-Hiroshima Observatory. Spectroscopic data of 8 epochs were obtained for analysis in order to confirm the photometric results
. Here we present the results of the photometric and spectroscopic analysis and also the results from our photometric reverberation mapping using NB filters.

Speaker: Mr Bovornpratch Vijarnwannaluk (Chulalongkorn university)
• 15:15
Analysis of Io’s magnetic footprint features using VIPAL magnetic field model 15m

Jupiter is the most gigantic planet in the solar system and yet, generating the most intense and enormous magnetosphere. VIPAL magnetic field model is chosen to simulate Jupiter’s magnetic field model. VIPAL was constructed based on observations by Pioneer and Voyager spacecrafts. This model appears to have a lot of benefits. For example, it can be used to analyze auroral emission in Jupiter’s ionosphere. This model also has the best prediction of contact positions between ionosphere and magnetic field lines that cross Io, called Io’s footprint. VIPAL also gives better magnetic field strength prediction than previous models. In order to predict footprint positions in both north and south hemispheres, we traced along the magnetic field lines beginning from Io orbital position to the footprint locations in ionosphere. There are many factors to be considered, for example, the shape of Jupiter, Io’s orbit inclination and eccentricity, to get the best prediction of footprint position as possible. These positions are expected to have the emission of auroral features. One of the most important of this features are their brightness. Previous studies found that this brightness has a strong relation with Io longitude and relates to the latitude of Io in the torus. Therefore, in order to make better physical interpretation, the relation between Io footprint brightness and magnetic field strength is presented in this work.
Keyword: Jupiter, VIPAL, Io, footprint, auroral

Speaker: chaiyaporn sukollapun
• 13:30 15:00
Session VIII: Tr. 5 Condensed Matter Physics Room J3

### Room J3

Convener: Dr Anucha Yangthaisong
• 13:30
High Pressure Phase Transitions of Transition Metal Hydrides 30m

Invited Speaker

Speaker: Udomsilp Pinsook
• 14:00
Predicting the High-Pressure Phases of Transition-Metal Tetraborides (TMB$_4$, TM = Fe, Ru, and Os) using Evolutionary Algorithm 15m

Transition metal borides (TMBs) are currently the subject of intensive interest
because of their superhard and ultra-incompressible features. Some TMBs are classified as
superhard materials mainly due to the presence of strong boron-boron covalent
bonding. To guide the experiment, employing density functional theory with evolutionary algorithm for crystal structure prediction, the high-pressure crystal structures of transition-metal tetraborides (TMB$_4$, TM = Fe, Ru, and Os) have been reported in this work. The ambient phases of all three materials exhibit metallic phases with space groups of Pnnm, P6$_3$/mmc and Pmmn for FeB$_4$, RuB$_4$ and OsB$_4$, respectively. At elevated pressure, FeB$_4$ and OsB$_4$ undergo transition to tetragonal phases with space group I4$_1$/acd and P4$_2$/nmc at pressure of 53.7 and 11.0 GPa, respectively. These high-pressure phases are semiconducting and they interestingly exhibit superhard character. Both dynamic and elastic stabilities are fully investigated to ensure the existence of the predicted phases. Electronic density of states is performed to clarify structure phase transitions and formation of the superhard phases. With the advantageous properties in these materials, they might potentially be the promising multifunctional materials for advanced applications such as cutting tools or wear-resistant coatings. Therefore, this finding should substantially induce further experimental investigation.

Speaker: Dr Komsilp Kotmool (Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom 73170, Thailand)
• 14:15
An investigation on lattice vibration and negative thermal expansion of ScF3 and other D09 structure materials 15m

A large negative thermal expansion (NTE) was discovered in simple cubic scandium trifluoride (ScF3) over a wide range of temperatures. The underlying mechanism has been explained by Li et al. [1] in terms of the vibration mode with the transverse motion of F atoms to their bond direction which behaves as quantum quartic oscillator. In this work, frozen phonon calculations with first-principles methods based on the density functional theory (DFT) have been performed to validate the individual modes in the phonon density of states and also investigate the anharmonic contribution on the potential energy of those vibrations in ScF3. The results showed the quartic potential for the traverse mode of F atoms. In addition, the anharmonic contribution on potential energy of some materials with D09 structure (ReO3, UO3, MoF3, TaF3 and NbF3) has been studied in comparison with ScF3. It has been found that the degrees of anharmonicity significantly depend on the bonding character between the two atomic species which can be described by simple spring-mass model.

[1] C. W. Li, X. Tang, J. A. Muñoz, J. B. Keith, S. J. Tracy, D. L. Abernathy, and B. Fultz, Phys. Rev. Lett. 107, 195504 (2011).

Speaker: Ms Tipaporn Patniboon (School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)
• 14:30
First-Principles Study of Alkali Metal Intercalated in 2H-MoS2 15m

MoS2 is a compound in transition metal dichalcogenide (TMDC) family that is semiconductor with layered honeycomb structure (2H) having strong in-plane bonding and weak out-of-plane van der Waals (VDW) interactions. In the bulk form, MoS2 has an indirect band gap where valence band maximum and conduction band minimum are located at the Γ point and the middle point between Γ-K point, respectively. Alternatively, the monolayer form has direct band gap (at the K point) which is more suitable for device applications. However, exfoliation of bulk MoS2 into monolayer results in a considerable defect density that has extremely low photoluminescence quantum yield. It has been proposed that the electronic characteristic of the monolayer can be reproduced experimentally in MoS2 by K intercalation [1]. In this work, the effects of alkali metal intercalation (such as Li, Na, K, and Rb) are investigated by using first-principles calculations. The results show significant expansion of interlayer spacing and contribution of electron donation from alkali metal to the conduction band of MoS2. The expansion of the interlayer spacing depends on atomic radii of the intercalated metals. Moreover, band gap type is changed from indirect to direct because of the expansion of the interlayer spacing reduces the electronic interactions between adjacent layers creating a quasi-monolayer character. The effects of K concentration have been investigated by varying the number of K atoms in the 2×2×1 supercell of MoS2Kx (where x = 0.25, 0.50, 0.75 and 1.00). In order to compare the results from supercell calculations with the primitive cell, the electronic structures from supercell calculations are unfolded [2] onto the high symmetry paths as defined in the first Brillouin zone of the primitive cell. It has been found that the interlayer spacing of MoS2K0.25 is large enough to exhibit quasi-monolayer character. The unfolded electronic structures show a direct band gap located at the K point with larger band gap than bulk MoS2. The Fermi level is a bit higher than conduction band minimum due to electron donation from alkali metal. Our results suggest that different atomic radii and concentration of intercalated alkali metals could provide an opportunity to tune band gap type and value of TMDC materials.

[1] Eknapakul, T., et al., Electronic structure of a quasi-freestanding MoS(2) monolayer. Nano Lett, 2014. 14(3): p. 1312-6.
[2] Tomić, M., H.O. Jeschke, and R. Valentí, Unfolding of electronic structure through induced representations of space groups: Application to Fe-based superconductors. Physical Review B, 2014. 90(19).

Speaker: Mr Thanundon Kongnok (School of Physics, Suranaree University of Technology)
• 14:45
Carrier mobility for acoustic phonon scattering in 2D extrinsic graphene 15m

We study carrier mobility of 2D extrinsic graphene by acoustic phonon scattering as a function of temperature (T) and carrier density (n). We calculate inverse relaxation times (τ) as a function of energy for different temperatures and resistivity (ρ) as a function of temperature for different densities (n).

Speaker: anucha pratumma
• 13:30 15:30
Session X: Tr. 9 Ion and Plasma Physics Room Th

### Room Th

• 13:30
Plasma investigations of high power impulse magnetron sputtering (HiPIMS) discharges 30m

Invited Speaker

Speaker: Phitsanu Poolcharuansin
• 14:00
Performance Analysis of DEMO Plasmas in the Presence of Internal Transport Barrier 15m

This work investigates plasma performance of DEMO plasmas in the presence of internal transport barrier. The study is conducted based on the simulation results carried out using a BALDUR integrated predictive modelling code. In these simulations, a combination of a neoclassical transport model NCLASS and an anomalous transport model Mixed B/gB is used. The boundary condition is described at the top of the pedestal, which is calculated theoretically based on a combination of magnetic and flow shear stabilization pedestal width scaling and an infinite-n ballooning pressure gradient model. The toroidal flow calculation is based on NTV (neoclassical toroidal viscosity) toroidal velocity model. Time evolution of plasma temperature and density profiles of ITER- and DEMO-like (European PPCS and Chinese HCSB-DEMO) plasmas are simulated with internal transport barrier (ITB). Densities of impurity (Beryllium and Carbon) and particle are compared among all scenarios. The aim of this study is to identify the optimization point between plasma performance and impurity accumulation. Though transport barriers can improve plasma performance, the significant accumulation of impurity in plasma core can lead to an enhancement of radiation loss.

Speaker: Dr Boonyarit Chatthong (Department of Physics, Faculty of Science, Prince of Songkla University)
• 14:15
Larmor Electric Field and Electron Temperature Anisotropy: Signatures for Magnetopause Magnetic Reconnection 15m

Magnetic reconnection is a key energy converting and plasma mixing process that plays important roles in different plasma systems. However, the physics of this key plasma process is only partially understood. Recently, NASA has launched Magnetospheric Multiscale (MMS), a group of four spacecrafts that use the earth magnetosphere as a laboratory, to specifically study physics of reconnection. However, MMS cannot send all of the data back to the earth due to limited communication bandwidth. Therefore, it needs a hint whether it is already around reconnection sites so that it knows when to change the data collecting mode from low resolution to high resolution. Using fully kinetic particle-in-cell simulations of asymmetric reconnection, we have found Larmor electric field, a new feature of reconnection electric field that has its origin based on the physics of finite Larmor radius. The scaling relations for the Larmor radius structure width and the strength of the field are proposed and tested successfully for many different upstream conditions that have the ion temperature greater than the electron temperature, similar to the conditions found at the magnetopause reconnction. Effects of the guide field have also been studied. The stronger the guide field the smaller the Larmor radius and so the thinner the width of the Larmor electric field structure. The magnitude of the field gets stronger as expected as well. Furthermore, we found that in the region where the Larmor electric field exists there will also be an electron temperature anisotropy. The anisotropy comes from electrons reacting to the parallel component of Larmor electric field leading to counter streaming motion of the electrons and therefore high parallel electron temperature. The Larmor electric field in conjunction with the electron temperature anisotropy can be used as a good reconnection signature alarming MMS that it is coming close to the a reconnection site.

Speaker: Dr Kittipat Malakit (Mahidol University)
• 14:30
Design of a high-temperature microwave furnace for preparation of highly efficient thermoelectric materials 15m

The thermoelectric material is a device that can generate electric energy from solar and waste thermal energies. On the other hand, It can generate temperature gradient from electric energy for cooling applications. Recently, researchers are interested in the synthesis of thermoelectric material by using microwave furnace. The efficiency of thermoelectric materials can be increased by microwave assisted synthesis because of rapid sintering and small gain size. High-temperature microwave furnace technology is complicated in the design and control system. The commercial furnaces are very expensive. In this research, we have developed high-power microwave furnace for synthesis of thermoelectric materials. The design of microwave furnace is optimized by Comsol multiphysics. Study of electric distribution in the waveguide and cavity, therefore furnace cavity is optimized to be 28x28x28 cm3. The waveguides and magnetrons are mounted on the four sides of the cavity. Each two waveguides on the opposite sides are placed at 90 degree to each other. The Heating of SIC crucible in the furnace have shown that crucible’s temperature can be increased from room temperature to 900o C within only about ten minutes. Heat energy in the furnace depends on the number of operating magnetrons, which is consistent with the distribution of the calculated electric field.

Speaker: Mr Direk Boonthum (walailak university)
• 14:45
Application of PIN Diode for Pulse X-ray Detector in TPF-II Plasma Focus Device 15m

Precision diagnostics of X-ray density and energy in the plasma focus device need high-speed devices which are very complicated and expensive. The multiple PIN diodes, a cost effective light detector, can be used to detect the pulse X-ray which are produced by the TPF-II, a 3.3 kJ dense plasma focus. The detectors are covered by difference thickness and type of X-ray filter materials such as alumina and Mylar in order to prevent the effect of visible light and decrease the X-ray intensity. The experimental data is compared with the simulation data to estimate the X-ray energy.

Speaker: Mr Arlee Tamman (School of Science, Walailak University, Nakhon Si Thammarat 80161, Thailand)
• 15:00
Effect of low pressure plasma on brown rice 15m

Low pressure plasma is one of the most widely used mechanisms for processing materials especially to modify their surface properties. The application of low pressure plasma in agricultural sector has also been realized. In this research, low pressure plasma was generated at radio-frequency and about 2.0 mbar in a vertical plasma reactor. The reactor is to facilitate plasma treatment of very short plasma residence time (0.1 s). This low pressure plasma has then been applied to treat a whole grain of pigmented or brown rice. We have also studied this effect on white rice as a comparison. It has been found that low pressure plasma have significantly reduced an optimal cooking time, lowered moisture content and promoted water absorption. The rheological property, using rapid-visco analysis, has indicated further significant changes in peak viscosity, setback and enthalpy ∆H after plasma treatment. SEM images show the plasma treatment has caused the rice grain surface to be more porosity.

Speaker: Wasit Arworn
• 15:15
SHEAR-DRIVEN DYNAMO WAVES IN THE FULLY NON-LINEAR REGIME 15m

P. Pongkitiwanichakul[1&2], G. Nigro[2], F. Cattaneo[2], & S.M. Tobias[3]

[1]Department of Physics, Mahidol University, Bangkok, Thailand,10400

[2]Department of Astronomy and Astrophysics, University of Chicago, Chicago IL, 60637, USA

[3]Department of Applied Mathematics, University of Leeds, Leeds, LS2 9JT, U.K.

Large-scale dynamo action is well understood when the magnetic Reynolds num- ber (Rm) is small, but becomes problematic in the astrophysically relevant large Rm limit since the fluctuations may control the operation of the dynamo, obscuring the large-scale behavior. Recently, Tobias & Cattaneo (2013); Cattaneo & Tobias (2014) demonstrated numerically the existence of large-scale dynamo action in the form of dynamo waves driven by strongly helical turbulence and shear. Their calculations were carried out in the kinematic regime in which the back-reaction of the Lorentz force on the flow is neglected. Here, we have undertaken a systematic extension of their work to the fully nonlinear regime. Helical turbulence, and large scale shear are produced self-consistently by prescribing body forces that, in the kinematic regime replicate the original velocity used by Tobias & Cattaneo. We have found four different solution types in the nonlinear regime for various ratios of the fluctuating velocity to the shear and Reynolds numbers. Some of the solutions are in the form of propagating waves. Some solutions show large-scale helical magnetic structure. Both waves and structures are permanent only when the kinetic helicity is non-zero on average.

Speaker: Peera Pongkitiwanichakul (Mahidol University)
• 13:30 15:30
Session XI: Statistical and Theoritical Physics Room E1

### Room E1

• 13:30
Invited-06 30m

Invited Speaker

Speaker: Dr Worrasak Sukkabot (Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand)
• 14:00
Study of chaotic motion in double rod pendulum 15m

Chaotic system is the system that normally occurs in the nature, and it is really sensitive to initial conditions. This makes chaotic system be unpredictable after the “critical time”. Most physics experiments are chaotic and, therefore, the experimental results should be collected before reaching critical time otherwise the experiment will be under chaotic condition which makes experimental results be meaningless. This research is conducted to find the factors which affect on the critical time for double pendulum. The motion of the double rod pendulum was tracked by using high speed camera and tracking program. The initial angle of the double physical pendulum to the vertical axis was varied. The critical time of each initial angle is determined by considering when the trajectories of the double physical pendulum released at the same initial angle start to diverge from each other. The results show that when the initial angle is very small, the critical time will approach infinity. On the other hand, when the initial angle is large, the critical time will reach zero. Moreover, there is some initial angles that critical time increase abruptly; meaning that the system suddenly become orderly. Furthermore, it is found that there is a good correlation between the result from the experiment and from the theory.

Speakers: Mr Phum Siriviboon, Mr Wichapol Dendumrongsup, Mr Yotawee Subthira
• 14:15
Investigating rare events with modified Monte Carlo method based on fluctuation theorem 15m

The Monte Carlo (MC) method is a useful tool to solve a broad range of problems numerically; random numbers are used to decide whether a process is accepted resulting in a desired equilibrium distribution. In certain complex problems where transitions to some states are rare, however, this method dramatically consumes more resources and spends a long time trying to find the equilibrium states. To improve upon the conventional MC, we apply a fluctuation theorem (FT) to MC which provides a relative weight of a backward trajectory with respect to the forward one. Interestingly, not only does FT double information but also assists a probability of system to converge to equilibrium more rapidly. We apply the algorithm to solve a test problem where the energy barrier to a certain state is comparatively high. The result of the simulation is consistent with the analytic solution, but with significant speed gain compared to that from the conventional method.

Speaker: Mr Takol Tangphati (Department of physics, Chulalongkorn university)
• 14:30
Application of Unitary-Scaling Decomposition in Nuclear Magnetic Resonance 15m

In quantum development, dynamical maps are central objects used to describe the behaviour of many quantum systems. While special kinds of mappings attract great interests, such as unitary evolution describing the dynamics in close systems and the Lindblad-type dynamical maps in Markovian open systems, a general formulation of the dynamical map has been rarely investigated. We introduce a unitary-scaling decomposition of a mapping on a finite dimensional state space, composing of a unitary evolution and a real-positive semi-definite matrix, called a scaling matrix, corresponding to the system's dissipative behaviour. We show that the formulation covers the Lindblad dynamics where the Markovian property is assumed, and it constitutes a building block for the beyond-Lindblad dynamics of finite dimensional systems. In order to demonstrate the formulation, in this presentation, we apply the unitary-scaling decomposition to quantum information processing in nuclear magnetic resonance (NMR), which employs the Lindblad dynamics for a two-level system. We also show that, the dynamical map in NMR can be decomposed as a product of the unitary and scaling matrices, which can be constructed from elementary gates in quantum information processing. We believe this formulation and the application in NMR demonstrate that the dynamics in a real situation can be simulated by another quantum system of the same dimension, and the unitary-scaling decomposition is a useful tool in processing information.

Speaker: Mr Fattah Sakuldee (Department of Physics, Faculty of Science, Mahidol University)
• 14:45
On the Lagrangian 1-Form Structure of the Hyperbolic Calogero-Moser System 15m

In this work, we present another example of the Lagrangian 1-form structure for the hy- perbolic Calogero-Moser system both in discrete-time level and continuous-time level. The discrete-time hyperbolic Calogero-Moser system is obtained by considering pole-reduction of the semi-discrete Kadomtsev-Petviashvili (KP) equation. The key relation called the discrete-time closure relation is directly obtained from the compatibility between the temporal Lax matrices. The continuous-time hierarchy of the hyperbolic Calogero-Moser system is obtained through two successive continuum limits. The continuous-time closure relation, which is a consequence of continuum limits on the discrete-time one, is also shown to hold.

Speaker: Umpon jairuks (Theoretical and Computational Physics Group, Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Thailand)
• 15:00
Application of Two-Ring Network and Ising Model to Agent-Based Dynamics in Financial Market 15m

We applied a two-ring network to study the dynamics of agents in a financial market. Two rings are randomly connected by coupling links. The Ising model is adopted to determine the state of each node, representing a financial agent. To relate the Ising network to a financial market, we mapped the (+1) state to the buying state and (-1) state to the selling state. The probability of changing states depends on the interaction between neighborhood nodes, coupling links, and the external field. Whenever the state of a node changes to (+1), the observed price variable increases by 1 unit and that agent buys 1 unit of stock with this price. Likewise, when a node changes state to (-1), the price decreases by 1 unit and this agent sells 1 unit of stock. Then the profit of individual nodes can be measured by the difference between its averaging cost and the current price. We vary the number of coupling links between two rings and the intensity of external magnetic field of each ring. We find that the magnetization strength of each ring depended on the number of coupling links. Consequently, the rate of change of the price depends on the network magnetization, and the profit grows as a quadratic function of magnetization. If two rings have opposite signs of magnetization, the less magnetized ring gets a loss in profit and the price moves in the direction of larger magnetized ring. But if both rings have the same sign of magnetization, most agents gain profits.

Speaker: Mr Kittiwat Tangmongkollert (MU-NECTEC Collaborative Research Unit on Quantum Information, Department of Physics, Faculty of Science, Mahidol University, Phayathai, Bangkok 10400)
• 15:15
Rope Coiling on a Plane 15m

Feeding the elastic rope steadily from the height toward a plane with constant velocity results in the circular coiling which is a manifestation of the buckling instability. The axial compressive forces, responsible for the buckling instability, are the own weight of rope due to the gravity and the inertial force due to the momentum of rope. The coiling frequency and the coiling radius are studied as a function of height and feeding velocity. Remarkably, there exists a characteristic velocity $v^{*}$ at which the coiling radius is largest. At feeding velocity faster than the characteristic velocity $v^{*}$ the inertial force dominates over the gravitational force. This characteristic velocity $v^{*}$ is experimentally found to increase with decreasing height $h$ in qualitative agreement with the dimensional analysis argument which predicts the relationship $v^{*} \sim h^{-1}$.

Speaker: Dr Sitichoke Amnuanpol (Physics department, Thammasat University)
• 13:30 16:30
Session XII: Special Project Competition Room E2

### Room E2

• 15:00
Coffee break 15m
• 15:00 15:15
Coffee Break 15m
• 15:15 16:30
Poster Session A: Tr. 1 -Accelerators and Synchrotron Radiations; Tr.2 - Astronomy, Astrophysics and Cosmology (Part III-IV); Tr. 3 -Atomic Physics, Quantum Physics, Molecular and Chemical Physics; Tr.5 -Condensed Matter Physics; Tr. 6 -Environmental Physics, Atmospheric Physics, Geophysics and Renewable Energy; Tr. 10 -Magnetic and Semiconductor Physics Tr. 11 -Material Physics, Nanoscale Physics and Nanotechnology (Part
• 15:15
Coffee Break 15m
• 15:30
Coffee Break 15m
• 16:30 20:30
Bankquet: Thai Physics Society annual meeting and Banquet Jitta Spa

### Jitta Spa

• Thursday, 9 June
• 08:00 10:20
Session XIV: Siam Synchrotron meeting Room J3

### Room J3

• 08:00
Registration 1h
• 09:00
SLRI-01 Current status of the BL5.2: SUT-NANOTEC-SLRI XAS beamline 40m
Speaker: PINIT KIDKHUNTHOD
• 09:40
SLRI-02 "Synchrotron Micro X-ray Fluorescence (µ-XRF)Spectroscopy and Imaging Beamline (BL6b) at Siam Photon Laboratory " 40m
Speaker: J. Chaiprapa
• 08:30 10:30
Session XIII: Tr. 2 Astronomy, Astro physics and Cosmology Room J1

### Room J1

• 08:30
Evolution of large-scale outflow over the past 9 billion years of the Universe 15m

In the present-day universe, galaxies can be divided into two main categories: young blue disk galaxies that are actively forming new stars, and old red elliptical galaxies that are passively evolving and forming no new stars any further. It is known that some of star-forming disk galaxies should evolve into passively-evolving ellipticals in the past. However, due to its relatively short timescale, the galaxy in the middle of this transforming phase had not been observed yet. In this talk, I will introduce a systematic approach to identify high-redshift galaxies with large-scale outflow. With Subaru telescope, we have discovered 12 galaxies at $z\sim1.2$ (8.4 Gyr ago) showing a largely extended ($>30$ kpc) [OII]$\lambda$3727 nebula, which we call [OII] blobs (OIIBs). Some of these galaxies are probably experiencing the final phase of star formation with their gas heated and expelled out by active galactic nuclei or supernova feedback, and quenching star formation whose process is a key to produce passively-evolving ellipticals. As a systematic search, we could derive the number density of these blobs and found that only 3% of star-forming galaxies at z~1 are facing the star-formation quenching process involving spatially extended [OII] emission. We are currently extending our search to cover 9 billion years of the universe ($z=0.1-1.5$) and find that the number densities of blobs tend to decline toward low redshifts consistent with the cosmic star formation history. In contrast, the fraction of galaxies experiencing large-scale outflow remains constant over time, suggesting that the phase of large-scale outflow is probably short in an order of hundred million years. Detailed study of large-scale outflow in these blobs are performed by ongoing spectroscopic observations with world largest telescopes such as Subaru and Keck. Their physical properties will also be discussed in this talk.

Speaker: Dr Suraphong Yuma (Mahidol University)
• 08:45
Local Structures of Universe from CMB Dipole measurement. 15m

From the observation of cosmic microwave background (CMB), we found the pattern of temperature fluctuation that has variation of one hot pole and one cold pole, i.e. dipole pattern. This indicates our motion relative to the CMB rest-frame, which is also taken to be rest-frame of the universe. From the CMB dipole field, we determine the velocity of the Sun $(V_⊙)$ or solar system with respect to CMB to be in the direction of Galactic longitude and latitude $(l,b)=(263^∘,48^∘ )$,with speed 368 $kms^{-1}$. But this relation of Sun relative to CMB is the sum of three components. Therefore, we can be decompose it into a sum of local and external components. $V_{Sun→CMB}=V_{Sun→GC}+V_{GC→LG}+V_{LG→CMB}$, that $V_{Sun→GC}$ is the motion of Sun relative to Galactic center (GC), $V_{GC→LC}$ is the motion of Galactic center relative to Local Group (LG) and $V_{LG→CMB}$ is the motion of LG relative to CMB rest frame.

Speaker: Mr Raengboon Incee
• 09:00
A study of CMB foreground spectral index using Planck data release II 15m

Cosmic Microwave Background (CMB) is the most important evidence for the Big Bang theory. The CMB radiation has been traversing the universe towards us since 378,000 years after the Big Bang. It was accidentally discovered by Arno Penzias and Robert Wilson in 1964 using their horn-feed antenna. This research is looking at foreground emissions of the CMB signal, focusing on synchrotron, free-free, and thermal dust and spinning dust radiation. We use the ESA Planck satellite mission data released in 2015. The Planck mission cover a wide range of radio and microwave frequency bands, from 27-77 GHz the Low Frequency Instrument (LFI) and 100-857 GHz the High Frequency Instrument (HFI). In this work use the spectral index method. From the results, when we observed at low frequency bands, the signal consists of CMB, synchrotron radiation and free-free emission. The spectral index distribution at high frequency bands have effect from thermal dust emission and effect from zodiacal light. When we considered the spectral index map we see the explicit separation between regions in galactic plane and around galactic plane and when we convert spectral index to temperature, we found that high-galactic latitude region has higher temperature than in galactic plane. This high temperature dust is believed to be a result of Supernovae explosion ejecting gas and dusts outwards and above the Galactic plane. The dust then falls back on to the plane as it cools down providing cold gas supply for new star formation in the Galactic disk.

Speaker: wanchalerm khwammai
• 09:15
Positions of the Moon in the Lunar Mansions related to the Buddhist holy days 15m

The position of the moon in Thai culture is divided into 27 sections according to sidereal period using reference from fixed stars. These fixed stars have 27 groups, called the lunar mansions. The days of full moon in some lunar mansions were assigned to the Buddhist holy days such as Magha Puja, Visakah Puja and Asalha Puja. It was found that before the Adhikamasa year and in the Adhikamasa year, the events of full moon may not match with the Buddhist holy days on the Thai Lunar calendar. This is due to the fact that the Thai lunar calendar was adjusted to match the solar calendar and the real lunar month. This effects the position change of the full moon in the Lunar Mansions.

Keyword: Lunar mansions, Lunar month, Thai Lunar calendar, Adhikamasa year, Buddhist holy days

• 09:30
Locating of Meteorite from Fireball in Thailand on 7th September 2015 by Contrail Calibration with Coordinates of Background Star 15m

Teerayut Loylip1,2 , Suwicha Wannawichian2
1Department of Astronomy, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
2National Astronomical Research Institute of Thailand (NARIT), Chiang Mai, Thailand
ABSTRACT
Fireball is the extremely bright meteor, which could be asteroid, comet or near Earth objects (NEOs). Those objects fall through the Earth’s atmosphere, while they are heated and glow due to the collisions with particles in the atmosphere. Its contrail appears like a long tail of smoke in the sky. Their remains from the burning in atmosphere impact onto the ground. The residue of burning meteor is called “Meteorite”. Astronomers can search fragments of the meteorite by compare contrail’s images with background star’s images that were taken from the same place to determine the location of the meteorite impact. These contrail images were used along with observing data from eyewitnesses of fireball. From this information we can confirm the direction of fireball and burning tail of the meteorites. From fireball which appeared in Thailand since September 7th 2015, we can estimate the contact point by comparing photo of contrails to background star. The contact point could locate in Sai Yok national park, Kanchanaburi province, Thailand, which is the target of finding parts of meteorite. This research will report the proceeding of meteorite explore which might remain in that area.
Keyword : fireball, asteroid, comet, Near Earth Objects (NEOs), meteorite, contrail

Speaker: Mr Teerayut Loylip (191 floor 3 191 Huay Kaew Road Muang District, Chiangmai Thailand)
• 09:45
Starobinsky Model in Rainbow Gravity 15m

In this work, we study the Starobinsky's model of inflation in the context of gravity's rainbow theory. We assume that the rainbow function can be written in the power-law form of the Hubble parameter. In addition, we clearly formulate the expressions of the spectral indices, the power spectra, and the tensor-to-scalar ratio associated with both scalar and tensor perturbations and we also compare the results of our model to Planck 2015 data. Finally, it turns out that the values of the number of e-folds $N_k$ and the rainbow parameter λ are constrained to be 42 ≤ $N_k$ ≤ 87 and λ ≤ 6.0 respectively in order to be well consistent with the Planck data up to 2σ C.L..

Speaker: Vicharit Yingcharoenrat
• 10:00
Photometric Monitoring of Active Galactic Nuclei for Short-term Variability 15m

Active Galactic Nuclei (AGNs) typically show variability on all time
scales which can range from days to years. The purpose of this work is
to study intra-year variability (i.e., months-timescale) of AGNs
through photometric monitoring in order to determine candidates for a
follow-up study for reverberation mapping techniques. Our sample of
AGNs are drawn from a well-defined quasar sample from the Hamburg/ESO
Survey or HES, which consists of 330 quasars with redshifts z < 0.3.
We have used the robotic Thai Southern Hemisphere Telescope at Cerro
Tololo Inter-American Observatory in Chile to observe the targets in
optical broadband B, V and R filters. After standard image
calibration, we use a custom-written pipeline based on publicly
available software to produce light curves from our observation for
future analysis. We analyze the light curves to determine whether the
target quasar shows intra-year variability and compare our photometry
with the original HES data which was taken about 25 years ago to
further study decade-scale variability. Here, we present our current
results of our light-curve analysis and show some particularly notable
example, such as HE1309-2501 with significant variability over short
timescales.

Speaker: Ms Supharat Charoensiri (Chulalongkorn University)
• 10:15
Young stellar population and star formation in and around HII regions 15m

We present a multiwavelength investigation of the young stellar population and star formation activities in the HII region Sharpless 311. Using our deep near-infrared observations and archival Spitzer-IRAC observations, we have detected a total of 125 Young Stellar Objects (YSOs) in an area of $\sim$86 arcmin$^2$. The YSO sample includes 8 Class I and 117 Class II candidate YSOs. The mass completeness of the identified YSO sample is estimated to be 1.0 M$_\odot$. The ages and masses of the majority of the YSOs are estimated to be in the range $\sim$0.1$-$5 Myr and $\sim$0.3$-$6 M$_\odot$, respectively. The 8 $\mu$m image of S311 displays an approximately spherical cavity around the ionizing source which is possibly created due to the expansion of the HII region. The spatial distribution of YSOs reveals that a significant number of YSOs are distributed systematically along the 8 $\mu$m emission with a majority clustered around the eastern border of the HII region. Four clumps/compact HII regions are detected in the radio continuum observations at 1280 MHz, which might have been formed during the expansion of the HII region. The estimated dynamical age of the region, main-sequence lifetime of the ionizing source, the spatial distribution and ages of the YSOs indicate triggered star formation in the complex.

Speaker: Dr Ram Kesh Yadav (National Astronomical Research Institute of Thailand (NARIT))
• 08:30 10:30
Session XV: Tr. 15 Physics Education Room Anek

### Room Anek

• 08:30
Students’ Alternative Conception in Vector Components with and without Physical Context 15m

2 open ended problems designed based on research instruments used in physics education research had been used to explore students’ conceptual and procedural understanding of vector components. With and without physical context, we asked students to find out magnitude and graphical form of vector components. The problems were given to 211 first year students of faculty of science during the third semester in 2014 academic year. The students spent approximately 15 minutes of their General Physics I course to complete the open ended problems. Consequently, their responses were classified based on the similarity of errors performed in the responses. The study results showed that without physical context, 53% of the students provided correct numerical magnitude of vector components while 10.9% of them punctuated the magnitude of vectors in x- with y-component. Others 20.4% provided just symbols and there was no answer of the last 15.6%. When asking to draw graphical form of vector components, only 10% of the students made corrections. A majority of them produced errors and revealed alternative conceptions. 46.5% drew longer and/or shorter vector components. 43.1% drew vectors in different form or wrote down other symbols. With physical context, only 6.6% of the students made corrections in numerical magnitude while 6.2% drew longer and/or shorter vector components. Almost all of them drew other force vectors in any axis instead. It indicated that many students did not develop a strong foundation of understanding in vector components and could not apply those concepts to such problems with physical context.

Speaker: Dr Umporn Wutchana (Ramkhamhaeng University)
• 08:45
Teaching Two-Dimensional Collision Using Momentum Vector Diagrams 15m

Multiple representations are valuable tools used to help students learn how to think like physicists and understand physics concepts. Generally, in case of teaching students’ understanding of collisions, one of the available options is using the momentum bar charts. They can clearly represent the magnitude of the momentum before and after collision but they cannot be used to represent directions. This work shows a new but conventional and important representation—the momentum vector diagrams—teachers can use to help students apply conservation of momentum in two-dimensional collision. The momentum vector diagrams were used to teach grade-10 students at a school in Bangkok in 2015. The other group of students at the same school was taught traditionally using conservation of momentum equations without drawing any momentum vectors. The post-test results revealed that the former group performed better in solving two-dimensional collision problems. In addition, students who learned with momentum vector diagrams realized more that the situation in the problem was two dimension.

Keyword: momentum vector diagram, two-dimensional collision, conservation of momentum.

Speaker: Mr Trai Unyapoti (Department of Physics, Faculty of Science, Mahidol University, Bangkok,10400, Thailand)
• 09:00
Effectiveness of Including Problem-Solving Strategy in Circular Motion in an Introductory Physics Lecture 15m

In this study an alternative method based on interactive instructions was included in Introductory Physics lectures to facilitate student learning in the topic of circular motion. In a preliminary study, we found that the concept of circular motion was challenging for many students although they had already learnt this topic in high school. They could not achieve the final step of problem-solving strategy which could possibly lead them to the correct answers. This motivated us to create a specialized problem-solving strategy for enhancing students’ problem-solving abilities. The specialized strategy was developed and provided in the lecture worksheet to guide students when they thought about solving circular motion problems. The worksheet included not only the specialized strategy but also problems for students to practice in class. This helped engage students to work on problems with their peers which is the main aim of interactive instruction. The effectiveness of the specialized strategy was evaluated by comparing the results of an examination between two participant groups; one learning with non-specialized strategy and the other one with the specialized strategy. We found that number of students in the latter group who could solve the problem until achieving the correct answer is greater than the other one. More interestingly, we also noted that the lower performance group was given the guided questions in the exam problem but the higher performance group was given the open-ended question. This asserts that the specialized strategy could help improve student abilities in solving circular motion problems.

Keywords: Circular motion, Problem-solving strategy, Lecture worksheet

Speaker: Ms Arunee Eambaipreuk (Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand)
• 09:15
Wireless Ticker as a Learning Tool in Physics 15m

This paper presents a further development of a so-called Ticker, a device supporting "hear and see" activity in classroom or laboratory exercises. While the original version of Ticker performs as a timing device, a new version of Ticker is improved in the sense of fast and wireless timing device. This wireless version provides the flexibility of measurements in various physics problems. The wireless ticker composes of a photodiode, a simple circuit, a wireless transmitter and a buzzer. The photodiode is equipped to enable the fast rise time. The ticker is operated by the change of intensity of the detected light on its photodiode. The simple circuit sends the signal through the transmitter while the wireless receiver is connected to a personal computer. Our developed software can be used to analyze the received signal. This new features of the ticker are meant to fulfill challenges in various teaching environments. The wireless ticker can also generate the ticking sound that aims to accommodate students with visual impairments. The experiments on simple harmonics, simple pendulum and acceleration have been performed as examples to show the capability of the wireless ticker. The demonstration shows the promise of the wireless ticker as a new teaching tool. This economic device allows a huge room for creativity with simplicity of reliable measurements.

Speaker: Ms Kanokwan Chongcharoen (Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Group (LANDOS), Science and Technology Institute. King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand)
• 09:30
Peer Instruction in Physics Recitation: A Case Study of Mechanics for Undergraduate Course 15m

This Study was to mainly explore how students' opinions toward Physics Recitation for Mechanics as undergraduate compulsory course by using Peer Instructiion. Aslo it was to study students' achievement on Mechanics Recitation test. The qualitative and quantitative research approach were used to collect the data in the fall semester of 2014 at University of North Texas, USA. Both decriptive and inferential statistics were used to analyz the quantitative data. Meanwhile, qualitative data were collected by classroom observation and interview protocol. These data were analyzed by using content analysis. The result showed that their opinions were mostly positively, however, there were some concerns and suggestions to improve the course. For students' Mechanics scores on recitation test were statistically significant different at 0.05 level.

Speaker: Dr Sumalee Waiyarod (Department of Education, Mahidol University)
• 09:45
Rocket propulsion activity at Mahidol witthayanusorn School 15m

Rocket propulsion is a complex and hard to understand content of Mechanics subject. For better understanding and learning perception, we established the problem solving activity called “Water rocket competition”. We assigned for every class, 10 classes and 240 students, in Grade 10 at Mahidol Witthayanusorn School for creating two home-made water rocket bottles for their class. The competition was held at the evening at February 18, 2016. The rule were the student have to launch rocket 2 time for aiming to target and got a score. After a competition, we assigned student for descripting their rocket by Physics perspective, the pros and cons of their rocket. The result showed that the average of the perception is 4.36 of 5 full scale. The students had fun about this completion and they can better explain the rocket propulsion.

Speaker: Mr Ratchanikorn Koomramyakul (Mahidol Witthayanusorn School)
• 10:00
Using 3-axis accelerometer sensor to determine pendulum motion and gravitational field 15m

This research use 3-axis accelerometer sensor with a signal wirelessly, to study of the motion of a pendulum clock and calculated gravitational field. The 3-axis accelerometer sensor and wireless transmitter will pack into pendulum clock. In experimental using to variance length of wire of pendulum clock at 20 cm, 40 cm, 60 cm, 80 cm and 93 cm. The signal send from 3-axis accelerometer sensor pass wireless transmitter to computer by hypothermal program and analytic data by space sheet program. This experiment measure the time period from 3-axis accelerometer sensor are 0.939 s, 1.320 s, 1.580 s, 1.841 s, and 1.959s respectively. The gravitational field of the earth calculate by the time period are 8.955 m/s2, 9.063 m/s2, 9.488 m/s2, 9.318 m/s2, and 9.567 m/s2 and error are 8.624%, 7.520%, 3.179%, 4.914% and 2.378% respectively with length of wire. From the result data, the short wire the error of gravitational field is higher than long length. Because time period is short so clock frequency time to send data of wireless transmitter do not enough.

Speaker: Mr Pisut Thanthong (lecture)
• 08:30 10:00
Session XVI: Tr. 11 Material physics, Nano Tech. Room Th

### Room Th

• 08:30
Synthesis, Structural, Crystallization Kinetics and Electrical Properties of Granular BT-NZF Nanocrystals in Silicate Glass 30m

Invited Speaker

Speaker: Kamonpan Pengpat
• 09:00
Preparation of glass-ceramic materials from glass powder compacted 15m

Glass-Ceramics is known to have very good mechanical properties while combining good properties from glass or ceramics which otherwise having them separately. Such good mechanic properties allow machining to any desirable shape or form, which is important in ornamental or fashionable area. In this work, soda lime glass powder (SLG), combining with other precursor such as SiO_2, TiO_2, and pigment oxide powders, was prepared. Weight composition of SLG-SiO_2-TiO_2-Pigment oxide, prepared by conventional melt-quenching technique, was investigated. The thermal profile of glass transition and crystallization were studied by differential scanning calorimetry (DSC). The crystal structure of the sintered glass-ceramics was carried out by X-ray diffraction (XRD) and the microstructure studies performed by scanning electron microscopy (SEM). The results show that devitrification of this glass system leads to glass-ceramics material. Its application in artificial opal gemstone work is foreseen.

Keywords: Differential scanning calorimetry (DSC), Glass-Ceramics, Soda lime glass (SLG)

Speaker: Nattawat Kulrat (Department of Physics, Faculty of Science, Mahidol University, Bankok, 10400, Thailand)
• 09:15
Effects of Sintering Temperature on Physical Properties of Chitosan/Hydroxyapatite Composite 15m

The chitosan/hydroxyapatite composite were prepared from hydroxyapatite synthesized from chicken eggshell and chitosan of shrimp. The composite was added chitosan with different concentration from 1 to 15 g and sintered at various temperature from 200 to 1200c with an increment 100c. The crystal structure, function group, morphology and thermal behavior of composite was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analyses (TGA), respectively. The results showed that the crystalline of composite was increased with increasing temperature. The porous of composite was appeared after sintered at 300c due to decomposed of chitosan. The number and size of pore was depended on amount of chitosan. The results of this research indicated that the sintering temperature could be produced porous on chitosan/hydroxyapatite composite.

Speaker: Chalongwut Boonpratum (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand)
• 09:30
Characteristic and Formation of Hydroxyapatite Synthesized from Heat Treatment of Cuttlefish Bone 15m

Hydroxyapatite is one of calcium phosphate phase and widely use in medical and dental application. Hydroxyapatite could be synthesized from natural calcium source. Cuttlefish bone waste are mainly composed of calcium carbonate. This paper, hydroxyapatite was synthesized from cuttlefish bone by high energy ball milling technique. The cuttlefish bone was heated at different temperature from 200 to 1300 ºC. The heated cuttlefish bones at different temperature were mixed with di ammonium hydrogen orthophosphate ratio 5:3 moles and added distil water 25 ml. The solution was milled at different time from 5 to 120 min. The structure, morphology and function group of cuttlefish bone and hydroxyapatite samples were investigated with X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), respectively. The results show that the natural phase of cuttlefish bone was aragonite phase of calcium carbonate (CaCO3) and changed to pure calcite phase after heated at 500 ºC. The calcite phase of cuttlefish bone was completely transformed to calcium oxide (CaO) after heated at 900 ºC. For hydroxyapatite synthesizing show that the samples were milled for 5 minutes not only hydroxyapatite phase appeared but also remained initial phase. The pure hydroxyapatite phase appeared that the both aragonite and lime phase precursors were milled for 60 minutes. From experiment, the cuttlefish bone before and after heated can be use a source of calcium for hydroxyapatite synthesizing by high energy ball milling technique.

Speaker: Mr Kridsada Faksawat (King Mongkut's University of Technology Thonburi)
• 09:45
Microstructure of Hydroxyapatite from Waste Eggshell Synthesized under Different Temperature. 15m

Hydroxyapatite, Ca10(PO4)6(OH)2 were prepared by the reaction of calcium hydroxide from waste chicken eggshell and di-ammonium hydrogen orthophosphate solution and heated at different temperature from 200 to 700 °C for 4 hour. The crystal structure, function group and morphology of hydroxyapatite were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), respectively. The structure was found to be hydroxyapatite phase at 200 to 600°C and the crystalline size increased with increasing temperature. However, the hydroxyapatite phase was transformed to tri-calcium phosphate phase completely at 700 °C. The morphology of hydroxyapatite were agglomerates and sphere particles. These experiments show that the hydroxyapatite could be synthesized from waste chicken eggshell and reduced time and cost for biomaterials application.

Speaker: Mr Aekgaran Sangmala (King Mongkut’s University of Technology Thonburi (KMUTT)126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok 10140, Thailand)
• 08:30 12:30
Session XVIII: THEP meeting Room E2

### Room E2

• 09:00 10:30
Session XVII: Tr. 6 Environmental Physics, Geophysics Room E1

### Room E1

• 09:00
Ionization in Earth’s atmosphere near polar regions following the solar storm on January 20, 2005 15m

Cosmic-ray induced ionization in the lower atmosphere (below ~ 15 km) is mainly caused by Galactic cosmic rays. However, some strong solar events can produce high energy ions with large intensity, which can penetrate to the lower atmosphere and produce significant ionization. We have modeled this effect for the solar storm of 20 January 2005, one of the strongest solar particle events ever recorded. This event produced energetic particles that can be detected by ground-based detectors, especially near the polar regions. We use the cosmic ray intensity vs. time as inferred from two neutron monitors, one located near the north pole (Inuvik) and the other located near the south pole (McMurdo). Then we performed Monte Carlo simulations of particle-air interactions using a realistic atmospheric model created from measured meteorological data to calculate atmospheric ionization at different altitudes and times for Inuvik and McMurdo. For the case of galactic cosmic rays, our simulation results of atmospheric ionization are consistent with balloon measurements. We have also studied the equivalent dose rate at airplane altitude. This research project is supported by Mahidol University and the Thailand Research Fund.

Speaker: Dr Achara Seripienlert (Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, Thailand, National Astronomical Research Institute of Thailand (NARIT), Chiang Mai 50200, Thailand)
• 09:15
Solar Radiation Estimation in Thailand Using Angstrom-Prescott Model and Empirical Methods 15m

It is required equipment and technique for measuring of global solar radiation and its component in many regions. There are financial difficulties in limited solar radiation measurement especially in developing countries. In this study, Angstrom-Prescott model could be employ to estimate solar radiations for 11 stations in Thailand. The empirical coefficients have been determined by five empirical methods, i.e., Food and Agriculture Organization (FAO), Rietveld model, Glover Mc-Culloch model, Tiwari & Sangeeta model and least square model. The estimated solar radiation was determined with measured solar radiation by using statistical tests; mean percentage error, mean bias error, root mean square error and correlation.

Speaker: kulaya keawsang-in
• 09:30
Variation in Cosmic Ray Count Rate at Doi Inthanon with Atmospheric Water Vapor 15m

The Princess Sirindhorn Neutron Monitor at Doi Inthanon, Thailand provides important information about high-energy cosmic rays from space. Both the neutron monitor (NM) and Bare (lead-free) neutron counters detect the variation of intensity in the interplanetary cosmic rays. In addition, the bare detector to neutron monitor count rate ratio (Bare/NM) provides information on the particle spectrum. We found that variation in Bare/NM is strongly anti-correlated with atmospheric water vapor (Ew) as inferred from the Global Atmospheric Data Assimilation (GDAS). In the present work, we develop a correction to Bare/NM for water vapor pressure. The results of comparison of the Ew from the GDAS database with another database will be discussed.

• 09:45
Characteristics of Daytime Penetration Electric Field in Equatorial Ionosphere during Recurrent Geomagnetic Storms 15m

Effects of recurrent geomagnetic storms (RGSs) induced by high-speed solar wind streams (HSSs) and corotating interaction regions (CIRs) on variations in daytime equatorial electric field (EEF) during 2007-2010 have been investigated. The EEF data as derived from magnetometer data together with the solar wind plasma data reveal many events of striking long duration of oscillating (short-lived) prompt penetration electric fields (PPEFs) about 10-12 hours. The PPEFs exhibited different characteristics depending on the interplanetary origin. The RGSs cause PPEF mainly in the main phase of storms and not all the RGS exhibited penetration of electric field into the ionosphere. Particularly, in some events, PPEF is terminated in the main phase at shock boundary in HSSs.
The turning of magnetic field Bz to the south in the main phase of the magnetic storms are associated not only with the input of energy into the magnetosphere by the magnetic reconnection, but also the PPEF in the day-side equatorial ionosphere by the shielding/overshielding processes. In some events, the northward turning of the IMF Bz is well consistent with quiet time value of the sym-H, which indicates the reduction in the rate of the reconnection.

Speaker: Mr Thana Yeeram (Lecturer)
• 10:00
Northern Thailand velocity structure from azimuthal tele-seismic receiver function studies 15m

Northern Thailand (NT) can be classified as the earthquake prone area, there are many active faults cutting through the area. The largest earthquake in Thailand modern history was also occurred on one of the active fault zones in the area on May 5th, 2014. In order to correctly estimate the epicenter and magnitude of the local earthquake, seismic velocity profile of the area is necessary which can be estimated from the receiver function (RF) studies. In this study, during period of this study January 2011 – August 2014, seismic data recorded by ten seismic stations in the northern Thailand were used to calculate receiver function time series. Earthquake sources in this study incident crustal layers from different directions respect to source location e.g. Japan, New Zealand, Papua New Guinea and a few from Europe. Receiver function for each station then processed in two different schemes. First, for each station, all receiver functions were processed together to produce crustal thickness and velocity structure beneath the seismic stations. Second, the tele-seismic waveforms were azimuthally classified according to its origin before processing to yield azimuthal RFs. Then Azimuthal RFs were used to estimate crustal thickness and velocity structures for each azimuth. The results reveal that both all RFs and azimuthal RFs yield similar result that crustal thickness increasing from 32 km in western part to about 40 km to the eastern part of NT. But ,there are two station, CMMT and LAMP, Chiangmai and Lampang province respectively, that present crustal thickness from azimuthal RFs is greater than that of all RFs about 1 km. Low velocity layer (LVL) can be observed with the waveform analysis. This LVL was supported by inversion of all RFs and azimuthal RFs which consistency provide the LVL at depth about 10 to 16 km at Mae Hong Son province and deeper at the depth about 16 to 24 km from Lampang province to Phitsanulok province.

Keyword : earthquake, receiver function, tele-seismic, azimuthal, low velocity layer

Speaker: Mr Tosapol Pengsai (Department of Physics Faculty of Science Mahidol university)
• 10:15
Synthesis of Nitrogen-Rich Carbonaceous with High Porous Volume for Supercapacitor Application 15m

The nitrogen (N)-rich carbonaceous material has gained remarkable interest fueled by their potential use as high energy density materials for electrical storage. Using this materials as primary components in supercapacitor electrode gives a superior ability to form double-layer charge coupling, therefore capacitance increase significantly. In this work, we introduce a novel method to convert biowaste into carbonaceous materials, in this case, spent coffee ground. The raw material is selected due to their naturally containing of high amount of nitrogen. The synthesizing process is composed of two major steps, hydrothermal and chemical activation using KOH. The effect of chemical ratio between N-rich biochar and KOH on surface area and specific capacitance significant was investigated from 1:1 – 1:4. The resulted carbon structure obtained the nitrogen content as high as 1.8 wt.%. The best condition to produce a high porous N-rich carbonaceous was 1:4 (Biochar: KOH) with BET surface area of 1,115 m2/g and porous volume of 0.53 cm3/g. The carbonaceous was used to fabricate high efficiency electrodes for supercapacitor and provided the specific capacitance of 165 F/g at scan rate 0.05 V/s in 6 M KOH electrolyte.

Speaker: Ms Thanyathorn Sangprasert (Center of Excellence in Environmental Catalysis and Adsorption, Thammasat University, Pathumthani 12120, Thailand, Department of Chemical Engineering, Faculty of Engineering, Thammasat University, Pathumthani, Thailand)
• 10:20 10:40
Coffee Break 20m
• 10:30 10:45
Coffee Break 15m
• 10:40 12:00
Session XX: Siam Synchrotron meeting Room J3

### Room J3

• 10:40
SLRI-03 Photoemission Spectroscopy (PES) at Siam Photon Laboratory 40m
Speaker: Narong Chanlek (Suranaree University of Technology (TH))
• 11:20
SLRI-04 Small Angle X-ray Scattering beamline at Synchrotron Light Research Institute 40m
Speaker: Siriwat Soontaranon
• 10:45 12:30
Session XIX: Tr. 2 Astronomy, Astro physics and Cosmology Room J1

### Room J1

• 10:45
Variability Study of Active Galactic Nuclei at Visible and X-ray Wavelength 15m

Active galactic nuclei (AGNs) are signposts of accreting supermassive
black holes at the center of active galaxies. They often have large
and rapid variation in brightness, whose investigation can provide us
with insights on the innermost environment of the accretion disk. To
study their variability, we conduct photometric monitoring of a sample
of nearby AGNs at visible and X-ray wavelength; these AGNs are
selected from the Hamburg/ESO Catalog, whose parent sample comprise
330 quasars at redshift < 0.3. We obtain visible wavelength data for
our AGN sample in Johnson B, V and R filters with the robotic Thai
Southern Hemisphere Telescope at Cerro Tololo Inter-American
Observatory, Chile. At X-ray wavelength, we obtain archival data in
2.0 – 6.0 keV band from the Monitor of All-Sky X-ray Image (MAXI) on
board the International Space Station. Using these data, we then
construct light curves of each AGN at both wavelength. Here, we
present early result from the study that indicates marginal
variabilities in X-ray and optical. We will discuss the implications
of variability limits on the fluctuation of power output of these AGNs
in optical and X-ray.

Speakers: Mr Pakawee Surarittikul (Chulalongkorn), Mr Tinn Thongmeearkom (Chulalongkorn)
• 11:00
The study of scaling relations of massive galaxy clusters using weak gravitional lensing technique 15m

Weak gravitational lensing of galaxy cluster provides a direct method
to probe their mass distribution. We report our preliminary results on the
analysis of a complete sample of $\sim 50$ massive galaxy clusters,
in the redshift range 0.1 - 0.6, in the Canada France Hawaii Telescope Legacy Survey (CFHT-LS), drawn from the large sample built by Covone et al. (2014). For each galaxy cluster, we determined the mass distribution from the radial shear profile, the mass-to-light ratio and the optical richness,in order to study how the galaxy population in clusters
trace mass as a function of scale. We have studied the scaling relation of mass with optical luminosity and richness for massive clusters. Moreover, by assuming that the average mass-to-light of galaxy clusters is very close to the cosmological values, we can determined the mass density of the universe.

Keywords: weak gravitational lensing : galaxy cluster

Speaker: Mr Anirut Phriksee (Chiang Mai University)
• 11:15
Spectroscopic study of the RX Hya – an Algol-type system with pulsating, mass-accreting component 15m

RX Hydrae is a short-period (2d.2815) Algol-type eclipsing binary system with a pulsating primary component. This system was discovered by H.S. Leavitt (Pickering, 1907), the first spectroscopic elements were determined by Struve (1946) and the absolute parameters of this system was derived by Vyas & Abhyankar (1989). Short-periodic pulsations in a light curve of a primary component were detected by Kim et.al (2002). We carried out the spectroscopic observations of this binary system in order to improve the binary system parameters and for spectroscopic study of pulsations in the primary component. Spectroscopic observations were acquired during 13 nights between 2014-2015 with the 2.4-meters telescope of Thai National Observatory (TNO) and fiber-fed medium resolution echelle-spectrograph. We obtained new accurate orbital radial velocities of two components of the binary system and search for pulsational variability of the primary component. Results of these investigations and new orbital parameters are presented.

Speaker: Ms Napaporn A-thano (National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand)
• 11:30
High-z Quasars Black Hole Mass Estimation via Photometric Reverberation Mapping 15m

The mass of supermassive black holes (SMBHs) of high redshift (z) quasars is crucial for understanding SMBH-galaxy co-evolution. The traditional method, spectroscopic reverberation mapping (SRM), would fail for most high-z quasars and is inefficient for a large quasar sample. Photometric reverberation mapping (PRM) has been recently proposed in order to utilise the up-coming high cadence, large sky coverage and deep photometric survey of the next generation large telescopes such as LSST. Such method is akin to the well established photometric redshift technique employed by cosmological community. In this talk, I will give a brief review of the PRM and highlight our on-going work of observational campaign at the 2.4m Thai National Telescope (TNT) to provide a proof-of-concept for such a technique. Our campaign aims to determine the size of Broad Line Region (BLR) around 10-15 high-z quasars which is essential to determine the central SMBH mass. The quasar sample used in our study was selected from SDSS-III BOSS in the sky regions accessible by the TNT during Thai dry season (November - April). The SDSS spectra were used to select spectroscopically confirmed quasars with redshift 0.8 ≲  z  ≲ 1.2. Furthermore, we used the spectral Radius-Luminosity (R-L) relation calibrated from low-z AGNs to select quasars with BLR size  ≤ 60 light-day suitable for the the length of TNT observing season. We are completing the second observing season this April. The data are now being analysed and we will report the results of our study in the talk.

Speaker: Ms Grittiya Pongsupa (Chiang Mai University)
• 11:45
Statistical Properties and Optical Followup of Fast Radio Bursts 15m

Fast radio bursts (FRBs) are intense transient millisecond radio signal with large dispersion measures (DM). Radio signal, which propagates through cold plasma, is dispersed as frequency square. After subtracted from the effect from galactic interstellar medium, the FRB's DMs are still large. This can be interpreted as FRBs have an extragalatic origin.As DM is related to the free electron content along the line of sight, FRBs are expected to be use as a universe probe. Until now, only 17 FRB have been detected. Only FRB 150418 has been proposed with an optical counterpart by Subaru telescope (Keane, 2016). FRB121102 has been found to be repeating 10 times since 2012. In this work, we have calculated luminosity function from current FRB population, and result from the optical follow up of FRB 150418 by Thai National Telescope.

Speaker: Jompoj Wongphecauxson (Chiang Mai university)
• 10:45 12:00
Session XXI: Tr. 15 Physics Education Room Anek

### Room Anek

• 10:45
The conceptual understanding survey of undergraduate physics students and pre-service physics-teacher students about twinkle light from celestial objects 15m

This research describes the results from the conceptual survey of 37 first-year undergraduate physics students (12 student of B.Sc. in Physics and 25 students of dual-degree B.Ed. in Education and B.Sc. in Physics), School of Science, University of Phayao, 15 pre-service physics teacher students, faculty of education, Chiang Mai University and 21 first-year pre-service teacher students, faculty of education, Chiang Rai Rajabhat University. The series of open-ended questionnaires involved twinkle light from a celestial object are used to investigate students’ understandings.
The results from all groups reveal that although most of them can give a meaning of twinkle light in general, but they cannot explain how light propagating from stars is twinkling. Some misconceptions such as the variation of stellar light intensity, some intensive or extensive properties of the light source etc. are detected. The results from this research will be used to design the instruction which engages students to have a better understanding in twinkle light from celestial objects.

Speaker: Dr Watcharawuth Krittinatham (Department of Physics, School of Science, University of Phayao)
• 11:00
Developing Learning Activities on Moment of Inertia for Grade 11 Students 15m

The sets of learning activities on moment of inertia and applications for grade 11 students were designed and created and then used for active learning activities. The activities include the experiment of the relations between linear and angular velocities, moment inertia and related quantities, inquiry activity on rolling of objects with different shapes and radii, and law of angular momentum conservation. The results show that the students understand the concept and students’ attitude towards Physics is increased.

Keyword : Learning activity, Moment of inertia, Application

Speaker: Ms Watchareeporn Kaewsan (Department of Physics, Faculty of Science, Ubon Ratchathani University, Warin Chamrab, Ubon Ratchathani 34190 Thailand)
• 11:15
The Development of Innovation of The Force from Magnetic Fields Acting on the Wire with an Electric Current Flowing Through in Physics for Undergraduate Students 15m

The researcher has succeeded in creating innovative learning of “The Force from Magnetic Fields Acting on the Wire with an Electric Current Flowing Through” using for teaching and learning in Physics for Science Teachers 2 subject. The objectives of this research were (1) to study the efficiency of innovative learning. (2) to identify the learning achievement and (3) to measure the level of saticfaction of innovative learning. The respondents are63 second year students of the Faculty of Education of Bansomdejchaopraya Rajabhat University. The findings revealed that the innovative learninghas efficiency higher than a defined criteria 95/85.The posttest is significantly higher than the pretest scores at .01 level of significance. The level of satisfaction in terms of students interest in innovation and knowledge understanding is 4.26 which is interpreted as Good.
Students remarked that the innovation feature is interesting, novelty, easy to use, comprehensible, inexpensive and conveniently available.

Speaker: Ms Nuntanut Wattanasupinyo (Bansomdejchaopraya Rajabhat University (BSRU)1061)
• 11:30
Correcting misconceptions about energy conservation using STEM approach 15m

The aim of this research is to design and create a test to measure the misconception about conservation of energy of the Thai high school students. The design of the test was based on the learning theory in Cognitive Domain from Bloom's Taxonomy and each question is divided into three levels – three-tier question. On first tier it is a question about incident. Second tier question about why the first answer and the third tier is in response to a question about the confidence at first-second tier. The test was submitted to two physics experts to check for correctness in physics details. Furthermore, the test was checked for content validity and item objective congruence by one education expert. Then this test will be used to measure the misconception of students participated in STEM-based activity.

Speaker: Chinapat Mongkholsiriwattana
• 11:45
The Developing of Scientific Advances of Liquid Lens use the Concept STEM Education 15m

The objective of this research was to developing of scientific advances of liquid lens use the concept STEM education. The samples of this research were 40 grade 11 students at Ratanaratbumrung School. In this research, students can learn about the liquid lens by demonstrations and design the experimental apparatus for study a contact angle, a focal length and a magnification of the lens witch STEM education is a curriculum based on the idea of educating students in four specific disciplines science, technology, engineering and mathematics. The measurement and evaluation is the test by scanning QR-code from Google Form program. This research found that the class average normalized gain was high gain and the learner can design base for placing this glass slide on the camera of a mobile phone, this will enhance the imaging ability of the camera to similar to an optical microscope. Furthermore, this research can integrated scientific knowledge of lens to solving problem in daily life.
Keywords: Liquid Lens, STEM Education

Speaker: Ms Netnapha Limphaiboon
• 10:45 12:30
Session XXII: Tr. 11 Material Physics, Nano Tech Room Th

### Room Th

Convener: Kamonpan Pengpat
• 10:45
Effect of boron addition on the structure and magnetic properties of CoPt nanoparticles 30m

We reported the effect of boron addition on magnetic properties and structure of CoPt nanoparticles. The CoPt-B nanoparticles were synthesized by means of the polyol process. The magnetic property measurement showed that the CoPt-B sample exhibited a much larger coercivity compared to the sample without B additive at the same annealing temperature. Transmission electron microscopy and energy dispersive X-ray spectroscopy revealed that the average particle size was about 2 nm for the as-synthesized sample with the ratio of Co and Pt was close to 1:1. After annealing, the particle sizes increased but the composition was maintained. The phase transformation of the nanoparticles versus temperature was investigated using a combination of X-ray diffraction and in-situ X-ray absorption analysis. It was shown that the phase transition temperature at which the nanoparticles change from the disordered A1 phase to the ordered L10 phase occurs at temperature of 600 C. We concluded that boron additives could reduce the ordering temperature of CoPt of about 100 C.
The addition of B at up to 60% promoted the formation of the L10 phase when the nanoparticles were subjected to annealing at 600 C. If the B content is higher than 60%, the phase transition is suppressed. The evidence of B addition on the structure of CoPt nanoparticles was further supported by the magnetic measurements. The results show that the coercivity of the annealed CoPt-B nanoparticles was enhanced by the B additions from 20 to 60%, with the maximum coercivity of 12,000 Oe for the CoPt-40%B sample.

Speaker: Supree Pinitsoontorn (Khon Kaen University)
• 11:15
Structural and magnetic properties of single crystal (311) plane of Co0.3Zn0.7Fe2O4 ferrite by ceramic method. 15m

Anuwat Hassadee1*, Kedsarin Meemon1, and Tippavan Hongkachern1
1Department of Science, Faculty of Education, Bansomdejchaopraya Rajabhat University, Bangkok, 10600

*E-mail: anuwat8652@hotmail.com

Abstract
Co0.3Zn0.7Fe2O4 ferrites were prepared by ceramic process and sintered 1250oC, 1300oC and 1350oC. The crystal structural, morphological and magnetic properties of ferrite were determined by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM) respectively. The result of samples show that cubic spinel ferrite and the crystallite size increases from 6.80 Å to 9.08 Å with the increase sintering temperature from 1250oC to 1350oC. The magnetization and cocercivity of samples were found to be ~22 emu/g and 29 Oe, respectively which independent of sintering temperature. The single crystal Co0.3Zn0.7Fe2O4 ferrite can be prepared at temperature 1350oC (rate 3oC/min) for 2 h. It was found that single crystal (311) plane.

Keywords : Co0.3Zn0.7Fe2O4: single crystal: ceramic method

Speaker: Mr Anuwat Hassadee (bansomdejchaopraya rajabhat University, Bangkok, 10600)
• 11:30
The Effect of copper and iron dopants on TiO2 nanotubes structure 15m

We have synthesyzed Cu and Fe- doped TiO2 nanotubes by an anodization method. The electrolyte was composed of ethylene glycol (EG), ammonium fluoride (0.3 % wt NH4F) and deionized water (2% vol H2O) with concentration of the dopants Cu and Fe of 0.5 mM. A constant DC power supply of 50 V was used during anodization with anodizing times of 2 hours. X-ray diffraction (XRD) was used to examined the microstucture and scanning electron microscopy (SEM) was used to viewed the surface morphology of the samples. The results show that TiO2 nanotubes are are anatase phases and the nanotubes are arraged in highly ordered arrays. The transition metal ion dopants may be incorporated into the TiO2 structure.

Speaker: Ms Ramida Chaiyarat (Department of Physics, UbonRatchathani University, Warinchamrab,UbonRatchathani, 34190, Thailand)
• 11:45
Colossal Dielectric Permittivity in (A3+,Nb5+) doped TiO2; A3+ = Cr3+ and Sc3+ 15m

(Cr,Nb)TiO2 (CN-T) and (Sc,Nb)TiO2 (SN-T) ceramics were prepared via a solid state reaction process. A single phase of rutile TiO2 was confirmed by X-ray diffraction (XRD). Dielectric properties were investigated over frequency range from 40Hz to 10MHz and temperature range from -70C to 220C. The ceramics showed high permittivities (>1000) with low dielectric losses and frequency-stablity. The behaviors of colossal permittivity can be explained by electron-pinned defect-dipoles, interfacial polarization and polaron hopping polarization.

Speaker: Noppakorn Thanamoon
• 12:00
Fabrication of Free Standing Photonic Crystal Film Consisting of Polystyrene Nanoparticles 15m

Method for fabricating a free standing film of colloidal photonic crystal (CPC) has been studied. The CPC films were previously fabricated by drop-coating monodisperse polystyrene nanoparticles on agarose hydrogel. The water-based medium in these CPC films was not long-term stable and the changing of air-humidity resulted in the variation of their optical properties. To sustain the optical properties of CPC film, the gel medium in the film can be replaced by more stable materials with slightly changing the periodic ordered structure of crystalline colloidal array (CCA). In this work, the polystyrene nanoparticles with a diameter of 160 nm were suspended in a nonionic polymerizable monomers solution which composed of N-vinyl pyrrolidone, acrylamide, N,N’ methylene bis acrylamide and benzoin methyl ether. A solid film was formed by shining UV light on the suspension to initiate the polymerization process. From this process, the CCA was fixed into the free standing film. Moreover, the free standing films of CPC were also prepared with various particle concentrations in the suspension in water between 250 to 1000 g/L.The diffraction spectra from these free standing films were measured by optical diffractrometer.The shifting of diffraction peak of free standing photonic crystal film can be described by the decrement of the nanoparticle distance.

Speaker: Ms Jitprabhat Ponchai (Mahidol university)
• 12:15
Development of fluorescent-organically modified silica (ORMOSIL) nanoparticles as targeted probe for Leptospira 15m

Leptospirosis is an infectious disease caused by pathogens of the genus Leptospira. This

disease becomes a wide-spreading problem in tropical areas including Thailand. A method of

detection which is used nowadays is microscopic agglutination test (MAT) but its detection limit

is so high that it cannot be used to detect pathogens in low concentration samples. To develop

a new method that has lower detection limit, organically modified silica (ORMOSIL)

nanoparticles with encapsulated fluorescent dyes were used. In this research, fluoresecent-

ORMOSIL nanoparticles were synthesized and tagged by antibodies that are specific for

Leptospira. After synthesizing, these nanoparticles were characterized by transmission electron

microscope (TEM) which showed that they are spherical shapes and their average size is 42.4

nm. Moreover, they were analyzed by fourier transform infrared spectroscopy (FTIR) which

reported that there is carboxyl group on their surfaces. Finally, its detection limit is reported as

10 5 cells/ml by observing agglutination with pathogens under fluorescent microscope. According

to this experiment, we can conclude that fluorescent-ORMOSIL nanoparticles are able to be

used as a targeted probe for Leptospira. For future works, we expect to develop this method to

have a multiplex function and to be used as targeted probe for other diseases.

Speakers: Ms Boonyaporn Suwattanapunkul (Student), Ms Jidapa Watthanaprakarnchai (student), Ms Naphatsorn Kulsayumporn (Student)
• 10:45 12:30
Session XXIII Room E1

### Room E1

• 12:30 13:30
Lunch Time 1h
• 13:00 14:45
Session XXVI: Tr.3 Chemical Physics Tr. 5 Condensed Matter Physics Room J3

### Room J3

• 13:00
Anchoring Number-Performance Relationship of Zinc-Porphyrin Sensitizers for Dye-Sensitized Solar Cells: Combined Experimental and Theoretical Study 1h

Invited Speaker

Speaker: Siriporn Jungsuttiwong
• 14:00
Effects of van der Waals Interaction on Structural and Electronic Properties of Methylammonium Lead Iodide Perovskites 15m

Methylammonium lead iodide (MAPbI${}_3$) belongs to perovskite material class with chemical formula ABX${}_3$, with A and B representing cations and X as anions. Ideal perovskite has cubic crystal structure with corner-sharing BX${}_6$ octahedral network and A at the center of the octahedral cage. This hybrid organic-inorganic perovskite has recently gained intensive research interests due to their high efficiency as photovoltaic materials.
Our study employs density functional theory (DFT) to study the structural and electronic properties of cubic MAPbI${}_3$. It has been shown in earlier studies that van der Waals interaction is crucial to DFT calculation accuracy regarding structural property determination. We investigate the importance of this non-local interaction and determine which van der Waals functional is suitable for DFT study MAPbI${}_3$ systems.

Speaker: Ms Vichawan Sakulsupich (Department of Physics, Chulalongkorn University Bangkok, 10330, THAILAND)
• 14:15
Special Quasirandom Structures 15m

Substitutianal alloys are disorder crystalline structure. First-principles study of alloys is take a large supercell that equivalent to a pure random structure. Structural models used in calculations of properties of substitutional random A_(1-x) B_x alloys are usually constructed by randomly occupying each of the N sites of a large periodic supercell by A or B. However this method is not efficient. But there is a way that it is possible to design “Special Quasirandom Structures” (SQS) that simulate the small periodic supercell. It can be compared to structures that have large number of configurations or large cell sizes. The proposed method optimizes the supercell with the occupation of the atomic sites (A or B). Using the language of Ising models to define the product of spin variable for each atomic sites. Then calculate a lattice average to construct special periodic quasirandom structures that can be used in the calculating total energy, optical and thermodynamic properties.

Speaker: Mr WIRUNTI PUNGTRAKOON (Chulalongkorn University)
• 14:30
Spin-polarized transport through ferromagnetic graphene microstructures with Fermi velocity modulation 15m

Chaiyawan Saipaopan 1, Wachiraporn Choopan 2 and Watchara Liewrian 1*

1 Theoretical and Computational Science Center (TaCS), Science Laboratory Building,
Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangmod, Thungkru, Bangkok, Thailand 10140

2 General Education Section, Christian University of Thailand, Donyaihom District Nakhonpathom,
Thailand 73000

*E-mail: watchara.liewrian@mail.kmutt.ac.th

Abstract
Theoretical and numerical modeling of a graphene-based spin-filter spintronic with Fermi velocity engineering are investigated. These graphene-based spintronic devices will open up new ways for creating a new generation of electronic devices which are smaller, faster and consumes less electric power. The spin filtering is a key issue for spintronic applications. The influence of velocity barrier (VB) on the spin transport of massless Dirac particles in ferromagnetic graphene are theoretically studied in a NG/FG/VB/NG junction. It consists of a ferromagnetic graphene region (FG) which is deposited by metallic gate and the velocity barrier is located on the left side of the ferromagnetic graphene where the propagation of massless Dirac fermion through a VB region of graphene with a position-dependent velocity. By biasing the FG region with the gate voltage (U), spin conductance is oscillating as function of Fermi velocity and its phase is shifted by varying U on ferromagnetic graphene. This system may be used as a tunable spin-polarized source.

Keywords : Graphene: Magnetic tunnel junction: Dirac equation: Spin polarization: Velocity modulation

Speaker: Mr Chaiyawan Saipaopan (Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangmod, Thungkru, Bangkok, Thailand 10140)
• 13:30 15:15
Session XXVIII: Tr. 11 Material Physics, Tr10 Magnetics and Semiconductors Room Anek

### Room Anek

• 13:30
Enhancing reduced-graphene oxide capacitor by photoexcitation experiment 30m

The development of a high power and high energy density supercapacitor would enable a technology for future space missions due to the need of ultra-lightweight devices, relatively high energy, and high power density with multiple charging cycles. This gives rise to the nanostructured supercapacitors that could provide an operational regime that enhances current technology for making such sorts of devices. In this work, we have fabricated thin-film reduced graphene oxide (rGO) electrodes for ultra-lightweight supercapacitor by drop-casting technique on polyethylene terephthalate (PET) substrate. With an application of white light illuminated under a certain power on such the rGO thin-film electrodes, their sheet resistance was decreased gradually, which indicate the increasing of free charged carriers in the rGO film. After sandwiching two identical rGO film electrodes of about 4 cm2 with an electrolyte gel, a capacitor is formed with silver epoxy contacts. The capacitance of such a device was estimated using an RC (resistor-capacitor) circuit with a variety of different bias resistors. We found its capacitance of our rGO capacitors in order of micro Farads with light illumination, which is comparable with the commercial ones. This research should give an understanding of capacitance enhancement by photo-excited charge carriers in such a nanostructured device.

Speaker: Alisa Saengsonachai
• 14:00
Theoretical Study of Gas Diffusion through Porous Graphene under Pressure 15m

Yuwadee Suwan, Sirichok Jungthawan, and Sukit Limpijumnong

1 School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 2 Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand 3 Thailand Center of Excellence in Physics (ThEP), Commission on Higher Education, Bangkok 10400, Thailand

The gas separation properties of porous graphene (PG) membrane on SiO2 substrate for simple molecules (H2, O2, and CO2) under pressure have been investigated by using first-principles density functional theory. The van der Waals interaction was taken into account by using Grimme’s force field (PBE-D2) approach [1]. For the clamped circular membrane subjected to a pressure difference between both sides of the membrane, the deformation of the membrane can be described by Hencky’s solution [2]. The deformation of the membranes lowers the diffusion barriers for H2, O2 and CO2 but by different amounts. This effectively increases the diffusion rate of H2, O2, and CO2 by up to 4, 8, and 12 orders of magnitude, respectively (in the pressure range of 0-5 MPa). The selectivity or relative diffusion rate of PG for the diffusion of H2, O2, and CO2 molecules at Deltap = 5 MPa relative to the CO2 diffusion rate at Delta p = 0 MPa are 1024, 1019, and 1012, respectively. The results suggest that the gas separation properties of PG can be tuned by applying a pressure different across the membrane.

[1] S. Grimme, J. Comp. Chem. 27, 1787 (2006).
[2] W. B. Fichter, NASA Technical Paper, 3658 (1997).

Contact: y.suwan09@gmail.com

• 14:15
Tunable and Simple Fabrication of CuO/Nitrogen Functionalized Graphitic-Rod Electrode via Electrochemical Deposition 15m

This study aims to develop a new method for capacitive improvement of 2 black (2B) (74% graphite, 20% clay and 5% wax; diameter 2.0 mm [1]) pencil graphitic rod through nitric acid treatment followed by CuO deposition via electrochemistry. After acid treatment, oxygen- and nitrogen- containing species were generated on the PR surface, which confirms by x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and the presence of redox peaks in cyclic voltammogram (CV) measured in 0.5 M Na2SO4 electrolyte with a scan rate of 10 mV/s. This causes an increasing in areal capacitance (Ca) from 3 mF/cm2 (original PR) to 76 mF/cm2. Subsequently, electrochemical deposition of CuO was performed via two conditions, at potential of 0.4 V (for electrolyte pH 10) and 0.9 V (for electrolyte pH 9) in ammonia solution system. N1s spectra indicate the presence of pyridinic (-N=C-) and pyrrolic (-CH-NH-) nitrogen on the samples prepared from both conditions. A mixture of CuO and Cu(OH)2 was observed in all samples. However, the electrode prepared at 0.4 V shows higher CuO content than that prepared from 0.9 V. This results in different redox peaks and Ca values, where the electrode prepared at 0.4 V provides higher Ca (170 mF/cm2) than that prepared at 0.9 V (88 mF/cm2). It can be concluded that the presence of oxygen species, pyridinic and pyrrolic nitrogen, and high CuO content play an important role in capacitive enhancement for supercapacitor application and they can be easily altered using our developed method.

Speaker: Ms Chanita Katavut (Department of Chemical Engineering, Faculty of Engineering, Thammasat University, Pathunmthani 12120, Thailand)
• 14:30
Raman Spectroscopy of GaN films on (001)- and (110)-oriented GaAs substrates 15m

Structural phases in the GaN films grown on the (001)- and (110)-oriented GaAs substrates were investigated by μ-Raman spectroscopy with the excitation wavelengths of 473, 532 and 633 nm. Raman spectra show a significant shift of phonon modes between the films on the (001)- and (110)-oriented substrates. For the films on the (001)-oriented substrates, phonon mode of cubic-TO was clearly observed at 553 cm$^{-1}$. On the other hand, the films on the (110)-oriented substrates showed a higher intensity of hexagonal-E$_2$-high localized at 568 cm$^{-1}$. Furthermore, Raman spectra, which measured using different excitation wavelengths of 473, 532 and 633 nm, show that the phonon mode observed at a higher wave number is significantly shifted from 736 to 739 cm$^{-1}$ for the wavelengths of 473, 532 and 633 nm, respectively. It is well known that the phonon modes localized at 736 and 739 cm$^{-1}$ are attributed to hexagonal-A$_1$ (hexagonal-LO) and cubic-LO, respectively. While Raman shift of cubic-TO at 553 cm$^{-1}$ is found to independence on the excitation laser wavelengths. These indicate that the cubic-LO phonon mode is sensitive to the excitation wavelength of 633 nm compared to other excitation wavelengths. Another possibility is due to the different of penetration depths of the laser wavelengths. It is interpreted that the GaN films exhibited more hexagonal phase in the region close to the GaN surface region. In contrast, the GaN films exhibited more cubic phase at the region near the GaN/GaAs interface.

Speaker: Mr Pitshaya Praigaew (Chulalongkorn University)
• 14:45
Magnetic Track Width Modeling 15m

We perform lapping experiments on magnetic readers’ and writers’ heads to determine the relationship between the magnetic track width and the electrical lapping guides, used as sensors to control the writer’s and reader’s lapping process. The experimental results are used to construct the model calibration curve and calculate the magnetic track width sensitivity function, defined as the rate of the change of the magnetic track width with respect to the writer’s height. First-principle calculations of this relationship and the magnetic track width sensitivity are also carried out with the Landau-Lifshitz-Gilbert equation using the Object Oriented Micro-Magnetic Framework (OOMMF) software. The modeling from both approaches yields consistent results, and shows that the magnetic track width sensitivity obeys a power-law relation. Consequently, we are able to investigate, predict and compensate the magnetic track width in a lapping process with reasonable accuracy.

Speaker: Dr Sujin Suwanna (Department of Physics, Faculty of Science, Mahidol University, Phayathai, Bangkok)
• 15:00
Growth and characterization of n-type and p-type Aluminum Antimonides 15m

Phannee Saengkaew1,*, Kulthawat Cheewajaroen1, Sakuntam Sanorpim2, Visittapong Yordsri3, Chanchana Thanachayanont3, Noppadon Nuntawong4 and Watcharee Rathanasakulthong5
1 Department of Nuclear Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand
2 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
3 National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency, Ministry of Science and Technology, Pathumthani, Thailand
4 National Electronic and Computer Technology Center (NECTEC), National Science and Technology Development Agency, Ministry of Science and Technology, Pathumthani, Thailand
5 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand

E-mail: Phannee.S@chula.ac.th, s_phannee@hotmail.com

III-V semiconductors, such as III-nitrides, III-arsenides, III-phosphides, and III-antimonides, have been applied in optoelectronic devices and electronic sensors as light-emitting diodes, solid-state lighting, optical storages and semiconductor detectors. In this project, the growth of high crystalline quality AlSb films with suitable optical and electrical properties has been investigated in order to develop AlSb-based room-temperature radiation detectors. By using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), I-V characteristics and Hall-Effect measurements, the crystal structure, surface morphology, optical properties and electrical properties of AlSb films were analyzed. 400-nm-thick AlSb films were prepared by RF-magnetron sputtering process in argon atmosphere at a pressure of 10-2 mbar, a power of 250 W and the ratio of Al and Sb of 85:15. In order to generate the n-type and p-type AlSb films, Cu and Si doping in AlSb films were performed by the ratio of Al, Sb and dopants of 82:14:4. As shown in Fig.1, undoped and doped AlSb films were achieved with a single crystal plane of (111), a lattice constant of 6.095 Å and a crystal size of 0.88 nm. To analyze the crystalline quality of AlSb films, Raman spectroscopy indicates all AlSb films with strains and lower crystalline quality by Si and Cu doping as presented in Fig.2. By I-V measurements in Fig.3, the electrical conductance of AlSb:Cu, AlSb:Si and undoped AlSb were obtained as 8.13, 0.36 and 0.28 m-1, respectively. Moreover, Hall-Effect measurement approves of n-type AlSb films by Cu doping and p-type AlSb films by Si doping with quite high carrier concentrations about 1017 cm-2 but still low carrier mobility. In further, PN junction didoes will be designed on Si substrates to develop the AlSb-based room-temperature radiation detectors.

Speaker: Phannee Saengkaew
• 13:30 15:00
Session XXIX: Tr. 17 Surface, Interface and Thin Films Room E1

### Room E1

• 13:30
Optimum Condition Coating of Semi-conducting layer in Low Cost Organic Solar Cells 15m

The objective of this research is to determine the optimum condition coating of semi conducting layer in low cost organic solar cells. We have already determined 5 conditions of coating thin films includes type of electron transporting solution, number of electron transporting layer, concentration of electron transporting solution, drop coating volume of electron transporting layer and speed coating of active layer. All of thin film layers on ITO glass have coated by convective coating technique and type of structure solar cell for this investigation is conventional structure solar cells. The results have shown that the optimum condition of coating from 5 conditions such as the optimum electron transporting layer solution is isopropanol (IPA). The optimum number of electron transporting layer is 1 layer, the optimum composition of electron transporting material with solvent of TiOx in IPA is 1:8. The optimum drop coating volume of electron transporting layer is 40 µl and the optimum speed coating of active layer between PCDTBT:PCBM is 2000 µm/sec, respectively. From the experiment, convective coating technique has performed to show efficiency of technique by low drop volume and give high transforming efficiency. Therefore, this coating technique has potential in manufacturing high scale.

Keywords: electron transporting layer; active layer; convective coating technique; low cost organic solar cells

Speaker: Anioat Paevongjeen
• 13:45
Characteristic investigation of sputtered Co-Cu films on glass substrate 15m

A series of sputtered Cox-Cu100-x films with different compositions (x = 88, 76, 65, 52, 38 and 34) were prepared by RF-sputtering process on glass substrate under 10-3 mbar of Ar pressure. XRD results presented both of Co (FCC) and Cu (FCC) phases in (111) plane at 2 = 44.23° and 43.34°, respectively. The intensity of Cu peaks was increased likewise the intensity Co peaks was decreased with increasing Cu composition. Morphology of all deposited films showed the columnar structures. The maximum and minimum surface roughness was observed on Co38Cu62 and Co88Cu12 films, respectively. At the temperature of around 600°C, DTA curves showed endothermic peak representing oxidation reaction of Co and Cu phases. Magnetic properties were investigated by MOKE technique under an applied magnetic field from -44.59 to 44.59 mT. The Co88Cu12, Co76Cu24 and Co65Cu35 films exhibited ferromagnetic phase whereas the Co38Cu62 and Co34Cu66 films showed paramagnetic phase. The maximum coercivity of about 15.1 mT and the minimum of about 1.7 mT were observed on Co88Cu12 and Co52Cu48 films, respectively. It can be concluded that the composition strongly effects on structure, morphology and magnetic properties of the films.

Speaker: Ms Suthasinee Somboonsap (Kasetsart University)
• 14:00
Effect of Heat Treatment on Properties of Sputtered Co100-xCux Film 15m

Granular Co100-xCux films with the different compositions of x = 19, 40, 54, 65 and 76 were prepared on glass substrate by RF-sputtering technique. After deposition, the films were annealed for 30 min at temperature of 400°C in Argon atmosphere. XRD result confirmed that the as-deposited films showed Co (220) and Cu (111) phases and annealed films showed Co3O4 (3 1 1) and CuCoO (3 1 1) phases. AFM results revealed the dependence of surface morphology on the film composition and heat treatment because of the difference of the deposition and segregation rate of Co and Cu atoms. The magnetic properties from VSM showed that Co81Cu19 film annealed at 400°C exhibited a perpendicular magnetic anisotropy. The saturation magnetization does not only depend on magnetic composition but also rely on annealed temperature. It can be concluded that the desirable surface morphology and magnetic properties of sputtered Co-Cu film can be controlled by an appropriate heat treatment and composition.

Keywords: Co-Cu film, Sputter deposition, Heat treatment, Magnetic properties

Speaker: Mr Gun Chaloeipote (Department of Physics, Faculty of Science, Kasetsart University)
• 14:15
Influence of Annealing Temperature and Ga Concentration on Ga-doped ZnO Transparent Thin Films by Sol-gel dip coating Methods 15m

In this work, ZnO transparent conductive thin films doped with 0-5 at% of Gallium (GZO thin films) have been prepared. GZO thin films were deposited by sol–gel dip coating method. Each dip-coated film was baked at 250°C for 5 min and then annealed at 300°C, 400°C, and 500°C for 2 hr under air ambiance. The effects of Ga dopant and annealing temperature on the structure, electrical resistivity, and important optical properties were investigated. Transmission spectrum shows high optical transparency in high-temperature annealed. XRD results and SEM images exhibit the significant change in the film’s morphologies and crystallinity with variation in Ga doping content. Meanwhile increasing annealing temperature results in the significant enhancement in its crystallinity. The electrical properties measured by four-point probe technique can be enhanced by the incorporation of Ga dopant.

Speaker: Dr Wisanu Pecharapa (College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520 Thailand)
• 14:30
Growth and Characterizations of AZO Thin Films by Pulsed DC Magnetron Sputtering 15m

Aluminum-doped zinc oxide (AZO) thin films were fabricated by the pulsed dc magnetron sputtering technique on different types of the substrates. The influences of the argon flow rate on the crystal structures, the physical morphologies, the optical properties, and the electrical attributes were investigated with the grazing-incident X-ray diffraction (GIXRD), the field-emission scanning electron microscopy (FE-SEM), the UV-Vis-NIR spectrophotometry, and the Hall measurements, respectively. The GIXRD analyses indicated that the AZO films were predominantly polycrystalline with the hexagonal wurtzite structure. The FE-SEM micrographs showed that the film thickness was increased with the increase of the argon-gas flow rate. The optical transmission of the prepared thin films exhibited higher than 84 % in the visible range. Finally, the AZO thin film deposited at 120 sccm-argon flow rate yielded the highest electrical resistivity of 8.453 × 10−3 Ω cm, with the carrier concentration of -1.623 × 1020 cm−3, and the charge mobility of 4.551 cm2/Vs.

Keyword: AZO, thin film, TCO, sputtering

Speaker: Kittikhun Seawsakul
• 14:45
Improving hydrophobicity of alumina sheet using plasma treatment 15m

The lifetime of instruments alumina base that operate in an open field environment can be extended via improving their hydrophobicity. One of the solutions of this problem is coated a specific type of layer that can provide hydrophobicity and durable in field environment. Alumina sheets of square shape; 25 x 25 mm, are used as substrate. The alumina surface was activated using plasma treatment. The sheets were then spin-coated with UV-curable thiol-ene resin; consisting of (3-Mercaptopropyl)trimethoxysilane, Heptadecafluorodecyl methacrylate (HDFDMA), 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (TMTVSi), and Pentaerythritol tetrakis(3-mercaptopropionate) (PETMP). The hydrophobic TMTVSi and HDFDMA thin films were activated through Thiol–ene Click reaction. The wettability of coated alumina was carried out. The preliminary contact angle analysis has shown that thin film between HDFDMA and PETMP to be hydrophobic with water contact angle of greater than 90^{\circ} More work such as creating cross-linked thiol-ene network structure is underway to improve from hydrophobic to super hydrophobic.

Speaker: Peera Champathet
• 13:30 15:15
Session XXV: Special meeting of NRCT: Opportunities in targeted research funding Room J1

### Room J1

• 13:30 15:30
Session XXVII: Tr. 3 Atomic physics, Quantum physics and Chemical Physics Room Th

### Room Th

• 13:30
Reconfigurable two-qubit gates for single photon polarization state 30m

Invited Speaker

Speaker: Pruet Kalasuwan
• 14:00
Simulation of Double Quantum Dots Charge Qubit Manipulation with Electric Field Pulses 15m

This study investigated the manipulation of a charge qubit by simulation for purpose of quantum computing. The charge qubit was constructed by modeling with InAs/GaAs double quantum dots (DQDs) based on sp3s* empirical tight-binding calculation. The manipulation concerned the evolution of the charge qubit, such as the state dynamics under the electric field pulses, and the leakage of probability to higher-order states of DQDs, called quantum leakage. The results demonstrated how the electric field pulses had influence on the state dynamics by determining the axes and frequency of rotation via specifying eigenstates and eigenenergies of the Hamiltonian. For quantum leakage, the pulse shapes with large changes and higher slope induce more quantum leakage than ones with smooth profiles. In addition, for the square electric field pulses, the simulations were also performed when the applied electric field pulses inherited uniform random fluctuation in amplitude and operating time. In this case, it was found that the precision of state measurement, quantified by the standard deviation (SD) of the occupancy probability in a dot, was proportional to the SD of the random fluctuation in amplitude. But for random fluctuation in operating time, such the proportionality does not exist. In both cases of random fluctuation, the accuracy of measurement, obtained by comparing the dynamics of the occupancy probability profile in a dot under pulses with no fluctuation, was shown to have non-monotonic relation with the fluctuation strength after some time.

Keywords: Double Quantum Dots; Gate Operation; Finite Electric Field Pulses, Quantum Leakage

Speaker: Mr Aniwat Kesorn (NECTEC-MU Collaborative Research Unit on Quantum Information, Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand)
• 14:15
Initiation of a partially pinned scroll wave in excitable chemical media 15m

Scroll waves are three-dimensional excitation waves, generally observed in many excitable media. The occurrence of electrical scroll waves in hearts causes some cardiac arrhythmia. Freely rotating scroll waves often drift and annihilate when they hit the boundary. In contrast, scroll waves pinned to unexcitable obstacles (e.g., blood vessel or scars) are discovered to appear last longer. The situations may be more complicated when the scroll waves are partially pinned with an obstacle. We present a successful method for initiating a partially pinned scroll wave in the excitable chemical media-the Belousov-Zhabotinsky reaction. The scroll wave gradually develops a cone-shaped structure because its pinned and freely moving parts have different dynamics.

Speaker: Mr Porramain Porjai (Faculty of Science and Technology, Valaya Alongkorn Rajabhat University under the Royal Patronage, 1 Moo 20 Phaholyothin Road, Khlong Nuang, Klong Luang, Phathum Thani 13180, Thailand)
• 14:30
Quantum Molecular Dynamics Simulation of an Atom Encapsulation by Fullerene 15m

We have implemented a computer code to perform quantum molecular dynamics (QMD) simulation. The motion of nuclei are treated with Newton’s 2nd law of motion; whereas the electrons are treated quantum mechanically using Hartree-Fock approximation. The code has been applied to study how an atom is encapsulated by fullerene (C60). A helium atom is placed 3 Angstrom away from the C60 cage. An initial kinetic energy is then given to the atom, shooting it into the cage. If the initial speed is small, the atom bounces back. By increasing the initial velocity, we can determine the minimum energy required to push the atom inside the C60 cage. QMD is a part a larger set of capabilities in Siam Quantum program.

Speaker: Somphoach Saichaemchan (Naresuan University)
• 14:45
Quantum Molecular Dynamics Simulation of Lithium Ion in Water Cluster 15m

We have implemented a computer code to perform quantum molecular dynamics (QMD) simulation. The motion of nuclei are treated with Newton’s 2nd law of motion; whereas the electrons are treated quantum mechanically using Hartree-Fock approximation. The code has been applied to study a small cluster of water molecules, consisting of 28 H2O. The simulated radial distribution function is then compared to the experimental results. A lithium ion is placed adjacent to the water cluster; and an external electric field is applied in order to study how the ion interacts with its surrounding as the ion is accelerated by the external field, and moving through the water molecules. By tracking the speed of the ion, we can determine the mobility of the ion. QMD is a part a larger set of capabilities in Siam Quantum program.

• 15:00
Two-Photon Interference in An Optical Gating Michelson Interferometer 15m

We investigate the interference of two photons in an optical gating Michelson interferometer both theoretically and experimentally. Theoretically, the phenomenon is studied using two different representations of photons, the space-time domain and a step-by-step two-photon state evolution. Both representations lead to identical results. The evolution analysis describes the result by the interference of four two-photon traveling states, whereas the space-time domain analysis reveals that the classical interference of the high-intensity light source is identical to a two-photon interference in the quantum regime, except for a multiplicative factor of nC2, where n is the number of photons. Experimentally, the picosecond pulse with a 808-nm wavelength is used as a photon source and a second harmonic generation (SHG) process in BBO crystal as an optical AND gate. Then, the two-photon interference is measured through the SHG signal. The interference pattern agrees with the theoretical prediction.

Speaker: Mr Ekkarat Pongophas (Collaborative Research Unit on Quantum Information)
• 15:15
Time Evolution of Gaussian Wave Packets under Dirac Equation with Fluctuating Mass and Potential 15m

Localization of relativistic particles has been of great research interest

over many decades. We investigate the time evolution of a Gaussian wave

packet governed by the one dimensional Dirac equation. The research

methodology consists of analytical approach and numerical simulations

employing the Chebyshev polynomial expansion of the propagation

operator. For the free Dirac equation, we obtain the evolution profiles

analytically in many approximation regimes, and numerical simulations

consistent with other numerical schemes. Interesting behaviors such as

Zitterbewegung and Klein paradox are exhibited. In particular, the

dispersion rate as a function of mass is calculated, and it yields an

interesting result that the super-massive and massless particles both

exhibit no dispersion in free space. For the Dirac equation with random

potential or mass, we obtain the probability profiles of the displacement

distribution when the potential is uniformly distributed. We observe that the

widths of the Gaussian wave packets decrease approximately with the

power law of order $o(r^{-1/2})$ as the randomness strength $r$ increases. This

suggests an onset of localization, but it is weaker than Anderson

localization

Speaker: Mr Atis Yosprakob (MU-NECTEC Collaborative Research Unit on Quantum Information, Department of Physics, Faculty of Science, Mahidol University, Phayathai, Bangkok 10400)
• 13:30 17:00
Session XXX: THEP meeting (Cont.)
• 15:15 15:30
Coffee Break 15m
• 15:30 17:00
Poster session B: Tr. 2 - Astronomy, Astrophysics and Cosmology (Part I-II); Tr. 4 -Biological Physics; Tr.5 - Condensed Matter Physics; Tr. 7 High Energy and Particles Physics; Tr. 8 -Instrumentatation, Metrology and Standards; Tr.9 -Ion and Plasma Physics; Tr. 11 -Material Physics, Nanoscale Physics and Nanotechnology (Part I); Tr.13-Optics, Non-linear optics, Laser physics, Ultrafast phenomena; Tr. 16 -Statistical and Theoretical Physics

Tr. 2 - Astronomy, Astrophysics and Cosmology (Part I-II); Tr. 4 -Biological Physics; Tr.5 -
Condensed Matter Physics; Tr. 7 High Energy and Particles Physics; Tr. 8 -Instrumentatation, Metrology and
Standards; Tr.9 -Ion and Plasma Physics; Tr. 11 -Material Physics, Nanoscale Physics and Nanotechnology (Part I);
Tr.13-Optics, Non-linear optics, Laser physics, Ultrafast phenomena; Tr. 16 -Statistical and Theoretical Physics

• 17:00 18:00
Conference Conclusion and Closing ceremony
• 18:00 19:00
Farewell
• Friday, 10 June
• 09:00 16:30
Excursion(optional)