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...
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...
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...
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...
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.
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 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....
Invited Speaker
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 $W/Z + jets$,...
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...
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...
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...
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...
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...
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...
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....
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. ...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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)...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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 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,...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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),...
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...
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...
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,...
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...
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...
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...
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...
In order to study small biological objects which cannot be observed with naked eyes, microscope is a common tool using nowadays, but it can be used to observe only 2-dimensions images. Thus in this work, we applied Mach-Zehnder interferometer to create interference fringe using beam expander and 10x lens to expand the image’s size, and saved it with CMOS camera into the computer for analysis...
In this work, we study the process of energy dissipation triggered by a slow large-scale motion of a magnetized conducting fluid. Our consideration is motivated by the problem of heating the solar corona, which is believed to be governed by fast reconnection events set off by the slow motion of magnetic field lines anchored in the photospheric plasma. To elucidate the physics governing the...
Nowadays, quantum physics is a basic knowledge for developing many modern/novel applications. In order to introduce it to high school students, a demonstration kit is developed. This kit, which is an extension of Malus’s law demonstration kit in classical optics, consists of one lamp (or a laser pointer), three polarizers and a screen. First, an introduction of the polarization property of...
A low-cost and portable pulsed light emitting diode (LED) source is a very important component for time-resolved spectroscopy which is widely used in medical, environmental, photochemistry and photo-physics applications. Typically, the light source with ultrafast short pulse and high repetition rate is very expensive. In this work, therefore, we present the simple nanosecond light pulse driver...
We study a network model which involves spin–spin interactions and spin–link interactions. Each Ising spin can be in two states. The network property of interest is the clustering. It was found that the clustering is unrealistically dense in the Strauss’s model. In this research, we observed the clustering at thermal equilibrium of each temperature and each energy couplings by Monte Carlo...
Abstract
A Survey of Raduim 226 level in 111 water supply samples of Amphur Meaung Khonkaen were determined by measuring Radium 226 via Manganese Fibers using gamma spectrometry. The average of 226Ra was found to be 0.038 Bq/l, range 0 – 0.13 Bq/l. The average risk of Annual Equivalent Dose was found to be 0.023 mSv/l, range 0 – 0.079 mSv/y. This study show that 226Ra in water supply of...
The modified pickup truck taxi, also known as red taxi, is the only main public transportation in Chiang Mai, Thailand. The smell from the taxi’s exhaust experienced while riding in the back of the taxi is uniquely unpleasant. This work, how the air flows over the taxi and how the exhausted particles flow into the back of the taxi were determined with both visualization and computer...
Khlui-Phiang-Aw is a reedless wind instrument and its structure is similar to a long pipe. Blowing Khlui-Phiang-Aw forms a column of air jet to hit a wind cutter, which is a sharp edge in front of the jet outlet. This is the input energy to the instrument. The jet is then altered by the wind cutter, and the alternated pressure is then radiated as sound. This mechanism produces oscillation of...
Werapong Koedsin1,*, Wissarut Intararuang1, Raymond J. Ritchie2, Alfredo Huete3
1 Remote Sensing & Geo-Spatial Science Research Unit, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Phuket, Thailand; werapong.g@phuket.psu.ac.th, armysub@gmail.com
2 Tropical Environmental Plant Biology Unit, Faculty of Technology and Environment, Prince of Songkla...
The explosive compounds that have mostly been found nowadays are ammonium nitrate and potassium nitrate.
To analyze the explosive compounds, the advanced instruments have been used. However they are very expensive, complicated and require specialists to operate such instruments. In this research, the polarized light microscope (PLM), which is cheaper and more portable, has been used to...
Tossavalai Chanasiriwat, Teerapat Rutirawut, and Tanakorn Osotchan
Department of Physics, Faculty of Science, Mahidol University, 272 Rama VI Road, Ratchathewi, Bangkok 10400, THAILAND
*Email: tossavalai.cha@student.mahidol.ac.th
Abstract
Nowadays, explosive materials are used widely such as firework and primer cap in bullet. Three elements i.e. antimony, barium and lead, are mainly...
Cold atmospheric pressure plasma consisting of OH, O, O3, NO, and NO2 radicals is currently popular in biomedical applications. This is due to its ability on destroying microbes and stimulating on production of new cells. In this work, we have applied ultraviolet (UV) absorption spectroscopy with micro stage XY table add-on for adjustment of radial distance to investigate and measure the...
The interaction between Io’s extended atmosphere and Jupiter magnetosphere is a strong evidence of electrodynamic interaction between intense plasma source and planetary magnetosphere. The result of this interaction is picked up current, which travels along the magnetic field line, from the vicinity of Io toward Jupiter’s magnetosphere. At the end of magnetic flux tube, spot emissions were...
Zinc oxide is antibiotic material that has been gained considerable interests to be used in antimicrobial cellulosic production. In this work, the antifungal activity of hexagonal ZnO particles coated mulberry paper against Aspergillus niger was investigated by standard inhibitory diffusion assay. The different concentrations of 0-12 mg/ml of ultrasonic treated ZnO colloids were prepared and...
The groundwater in Chiang Dao Area, Chiang Mai province is geologically related to limestone, which exposed as beautiful Karst topography. The groundwater system in Karst Area usually formed caves and underground conduits with turbulent flows and rapid vertical infiltration. The unique recharge mechanism make the aquifers tends to be complex, high heterogeneity and change in very dynamic with...
The purpose of the research is to compare students’ achievements and to study attitudes toward physics learning in Upper Secondary levels before and after being treated by Virtual Experiments (VEs) and the efficiency of VEs. The hypothesis of the research is that students’ achievements and attitudes toward physics learning will be improved significantly after VEs are treated. The...
This paper describes observations of GEOs satellite Thaicom series with 0.7 m telescope at Inthanon Mt., Chaingmai, Thailand. Observation took place 2 nights. Three-frame was done for each set and 2 sets were preceded for each satellite. Then the astrometry technique; LPSR (Least Square Plate Reduction) was used to get object coordinate in order to compare with well-known reference stars in...
The need to decrease in energy consumption of portable devices in daily living, the concept to find various alternative energy sources in surrounding areas. I have developed a piezoelectric generator which generates energy from vibration of a bicycle. In this case, piezoelectric material is used to transform mechanical energy to electric energy. Afterwards, the electric energy will be...
Structure and particle size of PbTe thermoelectric material prepared by hydrothermal method were investigated. Thermoelectric AgPb18SbTe20 alloy were prepared by hydrothermal method with different heating temperature and time. After that the structure and particle size were characterized by XRD and SEM, respectively. The observed XRD peaks for (111), (200), (220), (311), (222), (400), (420)...
Synchrotron radiation X-ray imaging is a powerful tool for observing internal structure of objects. It has been used for medical science, material science, and earth science researches, and also applied in industrial cracking and welding examination. Beamline BL1.2W is a newly constructed facility at the Siam Photon Laboratory dedicated to the X-ray imaging and the synchrotron radiation X-ray...
This paper described the measurement of centrifugal force by using a construction of LEGO Education apparatus. The main component consists of a spindle equipped with motor and connected with a long beam in horizontal. An object connected to a massless spring was put on the beam at the end of the beam. When the beam rotated around spindle axis and the object-spring extended due to the rotation....
Pollawat Dumrongkitpakorn1, a*
1The Demonstration school of Silpakorn university, Faculty of Education,
Silpakorn university , Nakhon Pathom 73000, Thailand
a*pollabphy@gmail.com
Abstract
This paper described the measurement of centrifugal force by using a construction of LEGO Education apparatus. The main component consists of a...
Spiral waves are an origin of the most dangerous cardiac arrhythmia leading to fibrillation and sudden death. It is shown that a high-frequency wave train can induce a drift of free spiral waves until they annihilate at the boundary. Elimination of spiral waves by using wave train is also demonstrated in the Belousov-Zhabotinsky (BZ) reaction but lack of the control of the wave period. We...
Microcontrollers Arduino Uno and Arduino Due were used to design and construct a gradient control system. These controlled circuits were given digitally signals for selection gradient, frequency encoding gradient and phase encoding gradient. The controlled parameters were performed with Visual C#, a user interface program. Signal levels were adjusted by a digital potentiometer, and converted...
The aim of this work was to design and build a permanent magnet system with uniform magnetic fields for a free radical imaging system. The magnet system was composed of 50 small permanent magnet cubes. The dimension of a magnet cube is 40 mm x 40 mm x 40 mm. Each piece was placed on two steel plates with dimension of 0.9 cm x 60 cm x 75 cm, which were separated by a space 3 cm and placed in...
This research aimed to design and construct a thermoelectric generator by using solar energy as a heat source, a parabolic dishes having diameter 1.5 m. with a focal length 0.5 m. is used to concentrate the solar radiation. Solar thermal energy is absorbed by a sheet of aluminum on focal zone. The hot side of thermoelectric generator (TEG) device was mounted on an aluminum sheet, heat sink...
Hall Effect is a physics phenomena using for electrical property measurement of semiconductor materials. The Hall measurement is done under an applied magnetic field from DC electromagnet. The magnetic field depends on the supply current in electromagnetic coils. In this work, high current DC power supply with voltage control current source and Hall Effect sensor were designed and constructed....
This research is the design and development of an experimental apparatus to study the conservation of energy to serve as a medium of instruction for high school. It has been tested with the experimental method to plot the graph compare the graph of the theory. It has been using Tracker video analysis and modeling tool for physics education support for lab results. It is designed to replace the...
As pH values used specify the acidity - alkalinityof chemicals and was widely used in medical,industrial and environmental. For determine the concentration pH on solution can be made using chemical methods.This study has the capabilities of smart phones to use analysis of color solution as needs to know the pH value.Develop of application on a smart phone for the color measurement with...
This research deals with the design and construction of experimental apparatus to determine the acceleration due to gravity on Earth by using free fall motion. The apparatus is made of a stainless steel pipe which is commercially sold. The stopwatch is used to measure times with resolution of 0.05 seconds. Falling objects induces signals through magnetic induction. The type GaAs semiconductor...
The design of apparatus to study of a rotating double cone down an inclined plane by tracker video analysis and modeling tool for physics education in order to determine the moment of inertia compared to the moment of inertia is calculated by theory. Using materials made from wood and materials made from super lean, which the object is to control both the volume and the same shape is double...
We present a range of methods used for accurate evaluation of the leading asymptotics for integrals of products of Jacobi polynomials in limits when the degrees of some or all polynomials inside the integral become large. The structures in question have recently emerged in the context of effective descriptions of small amplitude perturbations in anti-de Sitter (AdS) spacetime. The limit of...
ABSTRACT
This research was study particulate matter quantity and element in particulate matter to compare particulate matter quantity with pollution control department (PCD) standard and find the source of the particulate matter. Element quantity is analyzed by x-ray fluorescence technique (XRD).
The study found that have a lot of communities near the sugar factory. Nongkungtoaw...
Anchalee Malaithong, Watchara Liewrian*, and Kheamrutai Thamaphat
Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangmod, Thungkru, Bangkok 10140
*E-mail: watchara.liewrian@mail.kmutt.ac.th
Abstract
A simple demonstration set for investigating the damping effect of Waltenhofen’s eddy current pendulum was developed in this work. The...
The present study proposes calculations of electrical parameters to be used for electrical sex reversal technique using Hen-egg model. In the case of tilapia’s egg, its actual shape is an asymmetrical prolate spheroid with a short prolate spheroid bottom and a more elongate prolate spheroid at the top with a common equator rather than a symmetrical prolate spheroid. The two semi-minor axes (b,...
Graphene has excellent electronic properties however the electronic properties considerably depend on its thickness. In this report, thickness distribution analysis of epitaxial graphene films grown on Si-terminated SiC (0001) was demonstrated by using X-ray diffraction (XRD) pattern and a simple equation. Although this technique is simple, it provides fairly accurate information on layer...
The purpose of the research was to study the effect of drying temperature on reelability percentage and mechanical properties (tensile strength and elongation) of raw silk. The experiments were carried out under the conditions of drying temperature range 60 – 100 °C. The initial moisture content of cocoon was approximately 250-230 % dry basis (db). It was dried until down to a final moisture...
There are many factors contributing to a problem of voltage drop in electricity distribution system such as a proximity to large electricity demand during the peak hours, a long distance between the industries/end users and the electricity substations, load factors and etc. To solve the problem, the electric utility normally compensates this drop by increasing the input voltage level in the...
Oil palm has widely been grown in Southern Thailand. Nowadays, it has been become an important economic plant. The oil from different varieties are used for bio-energy and industrial uses and also for human consumption. However, production of young oil palm trees is still limited and the plants are expensive because it takes up to 8 months for germination to occur and the germination...
This research studied about an epoxy molding compound (EMC) floor life to reliability performance of integrated circuit (IC) package. Molding is the process for protecting the die of IC package form mechanical and chemical reaction from external environment by shaping EMC. From normal manufacturing process, the EMC is stored in the frozen at 5C and left at around room temperature for aging...
The effects of Vetiver fiber length on the mechanical properties of Root Vetiver fiber/epoxy resin composite were investigated. Five different samples were produced by varying the length of the fiber 3, 5, 7, 9 and 13 mm at 12% wt. fiber loading using the hand lay-up moulding technique. The tensile strength, tensile modulus, percent elongation, flexural strength, flexural modulus, impact...
In this work, an inner chamfer angle of capillary was studied for wire bonding process to circuit under pad of Integrated circuit (IC) package. Wire bonding process is so important for electrical connection of IC packaging. The capillary is an important equipment that used for connection a die with a package and profile of capillary also effect to reliability of a package. In experiment, 3x3...
MoO3 microbelts were successfully prepared by thermal process using MoS2 as a precursor. During synthesis process, nitrogen gas (N2) was purged into the furnace at three different flow rates; 6 sccm, 8 sccm, and 10 sccm, respectively. MoO3 microbelts with width in range of 8-50 and thickness approx. 2-5 then were prepared as a CO2 gas sensor, and the sensitivity was investigated by...
In this work, an effect of atmospheric Dielectric Barriers Discharge (DBD) plasma treatment on germinated rice is presented. A DBD plasma is generated by using a simple apparatus consists of stereo amplifier and car ignition coil. Then, the DBD plasma is used for treating germinated rice with various conditions and results on physical effect, such as root’s length, and chemical effect, such as...
A BF3 gas-filled proportional detector, or neutron counter, can be used for detecting atmospheric neutrons, which are created from (primary) cosmic rays colliding with air molecules. These (secondary) atmospheric neutrons can produce tertiary neutrons by interacting with other objects, such as buildings and ground. The number of produced tertiary neutron depends on the type of materials and...
For a spherical particle that is at least several times larger than the solvent molecules and is moving in a bulk fluid, its diffusivity is simply the ratio between thermal energy and its drag coefficient according to the Stokes-Einstein equation. This work focuses on transport of spherical particles through a row of parallel cylinders. Because the drag coefficient of the particle becomes...
Metal organic vapor phase epitaxy (MOVPE) is commonly used to produce a single crystalline GaAsN thin films by using hydrogen gas as carrier gas, leading precursors to reaction chamber. By the way, hydrogen gas has a possibility to flammable, thus it is need to special treatment to avoid this problem. On the other hand, the nitrogen gas (N${_2}$) is chosen one instead of hydrogen gas because...
In these day, polymer thin films is the base of various electronic device. The films need to be stable on solid substrates while processing application to preserve their properties. However, increasing temperature by operation of an electronic device causes polymer thin films lost their stability. In early 21st century, some researcher has discovered that a thermal stability of polymer thin...
Ti-Ga-P thin films were prepared by an asymmetric bipolar pulsed-dc magnetron sputtering technique using GaP:Ti targets onto glass substrate at 300°C in an argon atmosphere. The sputtering targets contained GaP powder compacted between metallic titanium (Ti) sheets, at the surface area ratio GaP:Ti of 1:1, 2:1, and 5:1. The crystal structure, electrical sheet resistance, and surface morphology...
High surface area nickel such as porous nickel has been found advantage for being utilized in a high capacity electrical energy storage device, gas sensor and catalyst. However, typical fabrication technique is template-assisted in which template material is consumable contributing to production cost, especially in the case of nanoscale featured nickel. Here, we proposed a template-free...
The ab-initio density-functional theory (DFT) within both the Local Density Approximation (LDA) and the Generalized Gradient Approximation (GGA) is performed to study the electronic properties and the structural phase transitions of Gallium nitride (GaN) with wurtzite (WZ), zinc-blende (ZB), rocksalt (RS) and cmcm structures under pressure in the range of 0 to 100 GPa. The calculations show...
The aim of this study is to electro spun epoxized natural rubber / poly (vinyl alcohol) (ENR/PVA) blend with composites membranes which were prepared by electrospinning technique for PEMFC Applications. Various concentrations of epoxidized natural rubber (ENR) solution in N,N-dimethylformamide (DMF) and tetrahydrofuran (THF) were directly added to PVA solution for plasticization of the electro...
We present numerical simulations on a release of spiral waves pinned to an unexcitable circular obstacle in a two-dimensional excitable medium using the Oregonator model. For a given obstacle, a constant electric field with amplitude stronger than a critical value Eunpin causes a pinned spiral wave to drift away from the obstacle. Our results show that the energy applied to unpin the spiral...
The present study proposes an alternative technique of sex reversal for Nile tilapia (Oreochromis niloticus L.) to enhance all-male yield using transient pulse-electric fields combined with immersion technique. Tilapia’s eggs obtained from our parent breeding stocks were selected as the egg-stage development during segmentation-pharyngula (2-3dpf) (day post fertilization) for electrical...
We have designed and created learning activities in classroom and outdoor experiments in Physics on Projectile motion. The purpose of the experiments is to increase learning achievement. The activities are composed of classroom experiment to obtain the relation between vertical and horizontal motion on the dimensions of positions and times. The students were also provided video about...
We study entanglement for a coupled harmonic oscillator system both discrete-time level and continuous-time level through the linear entropy (LE). We find that the nature of entanglement is drastically different between these two levels of the time structure. In the continuous-time case, we find that LE increases with the increasing of coupling constant and the system slowly gets into a...
This aim to calculate Ångström turbidity coefficient in the atmosphere of Thailand. Its value is derived from solar radiation data for three years between 2011-2013, which relate to visibility data. The result shows that Ångström turbidity coefficient is inversely proportional with the visibility data. Moreover, the value variation is depended on time period of the year. High value was present...
We have successfully prepared layers of CH3NH3PbI3 perovskite on fluorine doped tin oxide (FTO) coated on glass substrates using a sequentially spray-nebulous chemical deposition method. A sequence of spraying Pb(NO3)2 and CH3NH3I aerosols dissolved in non-toxic solvents was carried out to prepare compact and high crystalline CH3NH3PbI3 perovskite films. The concentration of Pb(NO3)2 precursor...
Fe-doped SrTiO3 nanoparticles were fabricated by sol-gel method using a solution that contained poly(vinyl pyrrolidone) (PVP), iron oxide (Fe2O3), strontium dinitrate (N2O6Sr), and titanium(diisoproproxide) bis(2, 4-pentanedionate) 75 wt% in 2-propanol. The precursor of SrTiO3 and Fe-doped SrTiO3 are acquired from sol-gel method. The SrTiO3 and Fe-doped SrTiO3 nanoparticles were successfully...
We report the fabrication of Fe-doped SrTiO3 nanofibers by electrospinning a precursor mixture of iron nitrate/Diisopropoxytitanium bis(acetylacetonate)/PVP, followed by calcination treatment of the electrospun composite nanofibers. The Fe-doped SrTiO3 nanofibers were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The...
Filterless water filtration is a method used to separate particles from wastewater using Dean flow, a secondary flow perpendicular to the main flow, in curved channel. The positions of the particles in the channel depend on three forces, wall interaction force, shear gradient lift force, and secondary flow drag force. In this work, a one loop spiral channel of 34 cm diameter with 20x5 mm2...
Nested model simulations were performed using the Weather Research and Forecasting (WRF) model (v. 3.6) ran in the High-Performance Computer (HPC) cluster of the National Astronomical Research Institute of Thailand (NARIT) for northern Thailand (2 km spatial resolution and hourly output), for the whole of Thailand (10 km spatial resolution and hourly output), and for the entire Southeast Asia...
The interaction between Jupiter’s magnetic field and Io creates the bright spot, which is called “Io’s magnetic footprint” (IFP). This footprint is a result of plasmas, which are picked up from Io along the magnetic field line and collide with atmospheric particles in Jupiter’s ionosphere. The brightness of Io’s magnetic footprint varies according to different positions of the Io in plasma...
The purpose of this work is to study the elastic moduli and gamma-ray shielding properties of the recycled silica gel glass (RSG) in 10CaO–xPbO–(90-x)RSG glass systems (where x = 20 to 45 mol.%) were prepared by the rapid quenching technique. In this work, the silica gel deterioration are source of silicon dioxide (SiO2) in this glass systems. Densities and longitudinal ultrasonic velocities...
A Lagrangian formulation of perfect fluid is a powerful tool to study the dynamics of the universe, especially interacting approach between dark energy and dark matter. A general description in this formulation is complicated and then it is difficult to handle since it invokes many functions. In field theory point of view, a non-canonical scalar field can be used to describe the perfect fluid...
Ethylenediaminetetraacetic acid (EDTA) is a well-known agent for chelating metal ions as found in various applications, i.e. environmental controls, food and non-alcoholic-beverage additives, etc. High content of EDTA in foods and environments is of health and environmental concerns. In this work, graphene oxide (GO)/hydroxyapatite (HAp) composite synthesized by chemical approaches was used as...
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...
CaCu3Ti4O12 (CCTO) thin films have been deposited successfully on LaAlO3 (100), NdGaO3 (100) substrates using a sol-gel method and they exhibited highly-preferential orientations. These substrates were chosen in terms of small lattice mismatch between CCTO and the substrate. The X-ray diffraction patterns showed that the CCTO film layers grown on different studied substrates have different...
We have developed the lessons to help students understand the motion of celestial objects easier than before by using Stellarium program. Stellarium is a free open source planetarium program that can be run on many computer platforms and also on a tablet. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium...
Spiral waves have been investigated in many different excitable media. A set of multiarmed spiral waves is a spacial self-organization and rarely studied in experiments because they are difficult to be created. We present a method to generate multiarmed spiral waves pinned to an unexcitable circular obstacle in a thin layer of the Belousov-Zhabotinsky reaction using a partition method. A thin...
We have designed and constructed learning activities in Physics on Fluid Mechanics. The purpose of the research is to enhance understanding, build up scientific attitude, and extend retention of students. The activities consist of the experiments on density, pressure, buoyancy, atmosphere and fluid dynamics. The lessons were integrated through STEM Education. The findings show that the...
In this work, thermoluminescence radiation dosimeter type 90RWG – 10Na2O – 0.01Cu2O was investigated on their elastic properties and structural properties. The effective atomic number was also compared between theoretical and experimental value. The glass samples were prepared by melt quenching technique. All samples were melted at temperature 1250 °C for 4 hr and annealed at temperature 500...
Gamma-ray mass attenuation coefficients have been calculated theoretically for 10CaO-xPbO-(90-x)silica gel waste and 10SrO-xPbO-(90-x)silica gel waste glass systems (where x = 20, 25, 30, 35, 40 and 45 mol%) by using WinXCOM program developed by National Institute of Standards and Technology. Then, the results were obtained further used to calculate half value layer and mean free path values....
This research was studied to focus on hydrophobic and hydrophilic properties, surface morphology and adhesion force of polymer compound using nanoparticles and atomic force microscope (AFM) by blend with nanoparticles. For this research used Poly(methyl methacrylate) (PMMA) that blended with nanoparticles such as Zinc oxide (ZnO) and Titaniumdioxide (TiO2) by varied nanoparticles ratio. From...
Graphene-based supercapacitors have been fascinated by many researchers since they can provide both high power densities and ultrahigh energy densities and hence high capacitance. Graphene is a material that has high porous surface roughness and because of its superior conductivity making them suitable for ultra-lightweight conducting electrodes for charged-storage device such as batteries and...
Seepage is one cause of dam failures, particularly on embankment dam. To prevent the threat, dam investigation and monitoring must be conducted for its own safety and public safety. One possible method for dam leakage detection and monitoring is the direct current resistivity (DCR) method which is a geophysical technique used to image the resistivity structure beneath survey profile. Leakage...
Jirattiporn Sanguansuttigul, Kheamrutai Thamaphat* and Pichet Limsuwan
Green Synthesis and Application Laboratory, Applied Science and Engineering for Social Solution,
Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangmod, Thungkru, Bangkok 10140
*E-mail: s903607@yahoo.com
Abstract
In food, beverage, and sugar production processes, one...
For cell analysis, cell membrane disruption or cell lysis is necessary in extracting intracellular components for further examination. One of the high efficient cell lysis techniques is electroporation, in which the high electric field strength is used to create nano-size pores on cell membrane. By using microfluidic system, high electric field strength can be generated using low applied...
Living and dead yeast cells of all species have the same characteristics which cannot be distinguished by observation through a microscope, even if the species Saccharomyces cerevisiae has a prolate spheroid, clear yellowish and semi-major axe of 3-5 microns. In brewery industry living yeast cells during the early stages of "lag phase" growth through "exponential phase" were preferred and...
The main function of kidneys is to remove metabolic waste while maintaining constant blood composition and volume. The first step of this process is a filtration through the glomerular capillary wall which has three different layers: the endothelium cell layer, the glomerular basement membrane (GBM) and the epithelial foot process with its interconnecting slit diaphragm. Photographs from...
On commercial fish farms male tilapia is the desired sex as they grow about 25% faster and divert less energy into reproduction: well-fed females turn most of their resources into egg production. For this reason, various methods have been employed to control unwanted reproduction by female tilapia. The traditional technique has been carried out by offering feed treated with a synthetic...
A first-principles calculation based on density functional theory (DFT) was performed for studying high-pressure properties of In(P,S). For calculation method, the concentration of impurity sulfur atom (S) was studied at 6.25% into super cell size 2x2x2 of InP, which called In(P,S). Phase stability and mechanical properties of InP and In(P,S) were investigated up to 10 GPa, and compared...
In this work, we measure Seebeck coefficient with illuminating of light. Effect of photo-Seebeck on the wide-gap oxide CuFeO2 was investigated on the photo-induced carrier contribution for enhancing thermoelectric properties. In addition, the illumination light was considered the changes of the Seebeck coefficient. Blue, Red, Green and Violet LED were used for the photon energy of the...
Study the density, volume and radioactivity of outcrop samples at Khao Chaison hot spring, Songkhla lake basin. The objective of these physical properties of rocks. The results obtained from the present study the density of Permian limestone of 2,654 ± 80 kg/m3 and volume 706.48 ± 99.50 cm3. Radioactivity measurement by using a high – purity germanium (HPGe) detector and gamma spectrometry. It...
In recent years, heavy baryons were almost completely discovered. The remaining baryons that have not been discovered are only bottom baryons $\Omega_b^{*-}$, $\Sigma_b^{*0}$, $\Xi_b^{*-}$, $\Sigma_b^{0}$ , $\Xi_b^{'0}$, $\Xi_b^{'-}$ and $\Xi_b^{'-}$ . This study is to predict mass spectrum of bottom baryons in s-wave using a constituent quark model with non-relativistic quantum mechanics...
We have measured the atmospheric secondary radiation due to cosmic ray showers along specific flight trajectories within Thailand. The secondary radiation at aircraft altitude is complex, with different types of particles over a large energy range. Using SEI Inspector detectors, the ionizing radiation dosage rate was measured at altitudes of 30,000, 33,000, and 36,000 feet to be 1.168 ,1.275...
In this work, highly quality CaCu3Ti4O12(CCTO)/SrTiO3(STO) heterostructures were successfully synthesized on LaAlO3 (LAO) substrate via a sol-gel method. The annealing temperature was fixed at 800 ºC. Our films were deposited with four layers; CCTO/CCTO/CCTO/CCTO, STO/STO/STO/STO, CCTO/STO/CCTO/STO and CCTO/CCTO/STO/STO. From X-ray diffraction patterns, it was concluded that the CCTO, STO...
Zinc oxide-Reduced graphene oxide nanocomposites (ZnO/rGO) were successfully synthesized via hydrothermal method. This research synthesized graphene oxide by modified hummer method and varied concentration of zinc hydroxide. The structure and morphology were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The optical property was investigated by UV-Vis...
Chada Siriphattananon1, Siriporn Romjinda1, and Kriangsak Kraiwattanawong1*
1Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok, Thailand, 10520
*E-mail: kkkkrai@hotmail.com
Abstract
A powdered carbon waste derived from a combustion chamber in a pulp mill is eliminated by landfill. The...
The present study employs various transient electric fields of square pulses, exponential decay and combination of square pulses with arbitrary mark-space ratio (pulse width: negative half of period) to enhance sex reversal of the commercially important freshwater and marine fish in suspensions for monosex-male. The eggs of Nile tilapia (Oreochromis niloticus L.), blue-spotted coral trout...
Perovskite Fe-doped LaTiO3 nanofibers were fabricated by simple electrospinning using a solution that contained poly(vinylpyrrolidone) (PVP), Lanthanum nitrate (La(NO3)3.6H2O) and Diisopropoxytitanium bis(acetylacetonate) solution. The Fe-doped LaTiO3 nanofibers with average diameters of 100 - 200 nm were successfully obtained from calcination of the as-spun Fe-doped LaTiO3/PVP composite...
It is well-known that most astronomical objects in nature are spinning. In general relativity, these objects correspond to the axially symmetric solutions, for example, the rotating solution of black hole which is called Kerr black hole solution. Even though the axially symmetric solution is useful, it is very difficult to obtain the analytic solution due to nonlinearity of Einstein equation....
A polymer electrolyte membrane fuel cell (PEMFC) shows different levels of performance analysis depending on the bipolar plate designs of the flow fields. The designs of the flow fields vary depending on the diffusion flux, which is the flow in a channel moving through a layer of gas diffusion to catalyst layers. However, flow fields that can suppress concentration loss in the area of...
The prevalence of new and current diseases is rising continuously. A high sensitivity and rapid detection are main concern for the development, especially in clinical diagnostic. Recently, DNA detection have been designed for higher precisely detection. One of DNA sensor is the DNA tagging with nanoparticles. It is widely used to apply in a variety of target including nucleic acids, small...
This study was conducted to evaluate specific energy consumption in various drying systems including advantages of infrared assisted drying process. Tests were conducted using instant rice berry under various experimental conditions as follows: In far-infrared drying were 50 and 700C, air velocity levels 0.5 m/s and 2 intensity levels (1 and 2 kW/m2). Drying kinetics and qualities in terms of...
X-ray fluorescent spectrometry, Fourier-transform infrared (FT-IR) and UV-vis spectroscopies are advanced techniques that can be used to characterize gem materials. Transition metal defects are causes of colors in corundum. Fe and Ti are the causes of the blue color in blue sapphire while Cr is the cause of the colors in ruby and pink sapphire. In this work, we investigated the differentiation...
Polyacrylonitrile (PAN)-based electrospun nanofibers were attracted significant attention during the last several years as a simple and straightforward method to produce nanostructures, which are of interest in many applications. Such as filter materials, composite materials, biomedical applications (tissue engineering, scaffolds, health care, drug release systems), protective clothing,...
Structural, vibrational and optical properties of thick GaPN films with the N contents of 0.8, 1.8 and 5.4 at% on GaP (001) substrates have been investigated using high resolution X-rays diffraction technique (HRXRD), Raman spectroscopy and micro-photoluminescence spectroscopy (micro-PL). The GaPN films were grown by metalorganic vapor phase epitaxy (MOVPE) using Tertiarybutylphosphine (TBP)...
The purpose of this study were to study the heavy metal residures in aquatic plant, hyacinth, by using X-ray spectroscopy technique. The samples were collected from Somdet Phra Srinagarindra 84 (Thung Talad) park, Nakhon Si Thammarat Province. It was found that the relative abundances of Fe, Mn, Zn, Pb, Br, Rb and Sr with respect to Ga (internal standard) decreased with the distance from the...
Classification criterion for identifying asteroid and comet has been developed continually for several decades. However the main concepts for the criterion remain unchanged. Comet has gas, which vaporizes from its surface when it travels into inner solar system (about 2 astronomical units). On the other hand, an asteroid does not emit gas anywhere in its orbit. The discoveries of asteroids and...
The purpose of this research is to study structure and particle size of PbTe thermoelectric material prepared by hydrothermal method. Thermoelectric AgPb18SbTe20 alloy were prepared from compounds of AgNO3, Pb(NO3)2, SbCl3 and TeO2 by hydrothermal method with different heating temperature and time. Then, the samples were dried in vacuum furnace for 6 h. After that the structure and particle...
A banknote has been considered to be a prime medium of payment from past to present. The use of the banknote in daily life unavoidably cause more or less deterioration to its properties. An optical property of banknotes especially in the areas of security printing in of interest in this study. Hundred bath Thai banknotes are used became of their unique security features. A number of...
In fluid mechanics, the stains of liquid drop serve us much information such as impact direction, impact velocities or liquid properties, through their mechanisms. In the perpendicular impact, splines, the spreading mechanism of the liquid out of the circumference, can be observed. There are a number of research studies demonstrating the generation of the splines and determining the spread...
In this work, acetylene sensing property of zinc oxide (ZnO) nanostructures-gold nanoparticles (Au NPs) composites were investigated and compared to ZnO nanostructures. Firstly, ZnO nanostructures were prepared by thermal oxidation of zinc films at oxidation temperature of 700C for 5 hours. Au NPs were then assembled onto the surface of ZnO nanostructures via photoreduction of 1x10-4 M...
Titanium nitride coatings have been used very successfully in a variety of applications because of their excellent properties, such as hard and decorative coatings and also diffuse barriers in semiconductor technology. This paper aim to find optimize deposition conditions of Titanium nitride thin film on the glass substrate and focuses on characterization by RF magnetron sputtering technique....
The catalyzer for biodiesel production in this work was prepared from cockle shell. The cockle shell was heated in the air at different temperature from 200 to 1300 C for 4 h. The cockle shell before and after heated was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Nuclear magnetic resonance spectroscopy (NMR) was used to determine yield of...
The synthesis of highly ordered titania nanotubular arrays as working photoanodes for H2 Production cells by anodization of Ti metal foils in different electrolytes is presented. Data analysis of X-ray diffraction (XRD) conforms that the titania nanotubular arrays are mainly anatase. Scanning electron microscope (SEM) analysis indicates that the titania composed of nanotubes have a high...
The DSSC has been the attractive for third generation of photovoltaic. Natural dyes were synthesized from the Turmeric, the saman bark, Bai-ya-nang, the Butterfly pea and Black rice, respectively. Molecules of natural dye were distilled from ethanol, butanol and acetonitite which are solvent. The concentration of natural dye were fixed by ratio of weight of natural dye powder: solvent volume...
The aim of this work is investigate characteristic of zinc substituted hydroxyapatite after heat treatment. Zinc substituted hydroxyapatite was synthesized from calcium oxide (CaO) of waste eggshell by precipitation method. The concentration of zinc nitrate was substituted hydroxyapatite at various from 1 to 25%wt. The zinc substituted hydroxyapatite was heated at different temperature from...
We present 3-D numerical models developed for heat transfer under soil with different shape pots in order to determine the influence on the temperature and the evolutions of temperatures at different depths with time over a day. The governing differential equations of heat transfer are solved by Explicit Method and Crank-Nicolson Method in Cartesian coordinate. The models ware validated in...
In magnetic drug targeting (MDT), magnetic nanoparticles (MNPs) coated by biocompatible materials and loaded with drug are injected into blood vessels and are specified to the target by the external magnetic field. Magnetic nanoparticles exhibit superparamagnetic properties when their sizes are smaller than the critical size. They show high saturation magnetization and no remanence at room...
This research studied about the efficiency of conventional oven and pressure oven of epoxy curing after die attach process to integrated circuit (IC) packaging reliability. Epoxy curing process is so important to make a completed epoxy due to cross linking to enhance microstructure of epoxy stiffness. This experiment, the samples were tested for two types of non conductive die attach screen...
Abstract
The objective of this study was to develop and produce fuel rods from compressed sawdust with the cold. And the thermal efficiency of the fuel rods from sawdust. By testing the efficiency of the fuel rods made from wood sawdust of the third kind See also wainscot wood eucalyptus. And timber The technical feasibility study of the properties of the fuel, the fuel rodsThe heat,...
This research presents the effects of deposition parameter on zirconium nitride (ZrN) thin film coated on stainless steel by cathodic arc technique. For the jewelry applications, the ZrN films must have the high hardness with high gold color. The deposition parameter in this work consists of input voltage supplied to substrate, percent of duty cycle, flow rate of nitrogen gas and deposition...
ZnO nanostructures prepared by anodization in combination with hydrothermal method using Zn metal plate in water vapor were invitigated. In the first step, the Zn nanoporus were fabricated by electrochemical anodization in a HF/Methanol/H2O electrolyte system. Ultrasonic wave was used to clean the surface of ZnO nanoporus in the medium of water after the completion of the anodization. After...
The primary objective of this study is to design and optimize air insertion Components for biogas system widely implemented in swine farms. The experiment is performed with a small-scale 2.5 m3 operating on Controlled swine waste. The result shows that an optimum ratio of injected air per volume of biogas production is approximately 4.5 %. In this condition, measurement of H2S trace can be...
Nowadays, the measurement of sugar solution concentration has a big impact in both industrial and medical works. The high cost apparatus of spectrophotometer has been applied to study the sugar solution concentration before. We expect to apply the low cost measurement for this kind of work. Thus in this work, we aim that to use laser refraction technique to study the sugar solution...
Polymeric materials are widely used to cover on a carbon nanotube for producing the n-type semiconductor. However, understanding of structural polymerization of polyethyleneimine (PEI) warped on carbon nanotubes is poor. To approach the structural, all of calculations are treated with the package based on Density Functional Theory correcting with vdW correction. As a result, the functionalized...
Abstract
In this work thermoelectric concrete block merge between thermoelectric modules and brick. The block can use with high temperature (1273 K). Based on the temperature difference occurs during the bottom and top of the concrete blocks, it can be create electrical power.
The main objectives of this project were to design and devise thermoelectric modules, it can be converted temperature difference to electrical power or reversion. These thermoelectric materials were prepared by the solid state reaction method. The material is aluminium oxide doped zinc oxide (Zn0.96Al0.04O) to sinter at 1473 K and 20 hrs, it showed the best thermoelectric activity. The...
Thermoluminescence properties of Thai commercial window glass provided by Guardian Industries Corporation (denoted as WG) were studied. WG was doped with varying concentrations of different transition metal oxides (TMOs). The composition of glass is 90WG-10Na2O-xTMOs (where TMOs = TiO2, V2O5, CrO3, MnO2, Fe2O3, Co2O3, NiO , Cu2O and x = 0.000, 0.001, 0.010, 0.100, 1.000 mol%). Glass samples...
In this paper thin layer drying of squid is presented. Thin layer drying of squid was conducted under controlled conditions of temperature levels of 40 °C, 50 °C and 60 °C and relative humidity ranging 10% - 30%. Drying air temperature has great influence on the drying rates of squid and drying time decreases with the increase in drying air temperature. Eight different thin layer models were...
In order to achieve electrical sex reversal technique of tilapia’s egg (O.niloticus) with androgen hormone delivery, the induced transmembrane potential (TMP) for electropermeabilization of the egg’s membrane is the first priority to evaluate through theoretical analysis. Previously, the closest available model to calculate TMP of tilapia’s egg was a shelled symmetrical prolate-spheroid....
Umbra and Penumbra Areas of Sunspot from the Solar and Heliospheric
Observatory image
Thawatchai Sudjai
Department of Physics, Mahidol Wittayanusorn School, Salaya, Phuttamonthon, Nakorn Pathom, 73170
E-mail: thawatchai@mwit.ac.th
Abstract
The areas of umbra and penumbra of sunspots can indicate the magnetic field of the Sun, and the development of the sunspot group. As the size of...
Edible bird nest is one of high economic value agricultural product in southern Thailand. Wild and farmed swallows are used to produce such a product. Nevertheless, both wild and farmed nests are subject to elaborate cleaning processes. Unfortunately, such processes require human labor. Typically, eight hours of tedious work are necessary to handpick feathers and dusts coagulated with the...
In this work, we investigate the Vainshtein mechanism in the alternative theory of gravity induced by the general disformal transformation on Einstein action. This theory of gravity is the disformal gravity. We find that the Vainshtein mechanism works well in this theory of gravity. Based on this result, we compute the post-Newtonian parameters and study the bound on these parameters.
The separate universe approach is the one of the important tools for study primordial cosmological perturbations on large scales. Since it is constructed without using of any particular theories of gravity, it is expected to valid for any covariant theories of gravity. However, recently, there is a study showing that it is valid only for some theories of gravity. In our research, we have found...
In general relativity, there exists a wormhole solution which is a region connected between two asymptotically flat spacetime regions. The wormhole solution may be obtained in a modified gravity theory and also possibly give non-trivial corrections to the one in general relativity. In this presentation, we investigate the wormhole solution in a modified gravity theory. One of interesting...
Measurement of Standard Model Z-boson productions in the muon and anti-muon decay channel is presented. The data are collected from proton-proton collisions by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) in 2012, at the center-of-mass energy 8 TeV and integrated luminosity of 19.70 fb$^-$$^1$. The kinematic variables e.g. transverse momentum, rapidity and...
