The Milky Way is the galaxy we can dissolve in its indivudual constituents and thus study in most detail. The abundances of individual chemical elements in stars reflect the chemical composition of the gas at the location and time of their formation. The combined stellar record of the Galaxy can thus be used to analyze its resolved star formation history. The motions of the Galaxy’s stars can...
While the traditional materials of choice for piezoelectric devices over the past 60 years were lead-based perovskite ceramics, the environmental- and health-concerns, supported by governmental regulations, triggered the search for new lead-free alternatives [1]. This is embedded into a view of annual usage of lead as compared to other metals and the efforts to reduce lead in various...
This research aimed to provide solutions for secondary school teachers on physics who were incapable of designing decent stem education for their own learning activity contexts, and experts did not agree that it did not conform to the concept of STEM Education. It was, then, to develop steps on physics STEM Education learning system activity in secondary school education for further...
Diffusion of macromolecules through nanopores of comparable sizes is affected by an interaction between the particle and the confining entities including both hydrodynamic and electrostatic interactions. The particle-pore hydrodynamic interaction causes an increase in the drag force exerted on the particle, resulting in the reduction of its diffusivity. If the particle is charged and submerged...
Students always bring intuitive ideas about physics into classes, which can impact how they learn and how successful they are. To examine what Cambodian students think about projectile motion, we have developed seven open-ended questions and applied to grade 11 before (N=124) and after (N=131) conventional classes. Results revealed several consistent misconceptions, for instance, many students...
With and without physical context, we explored 59 undergraduate students’conceptual and procedural understanding of vector components using both open ended problems and multiple choice items designed based on research instruments used in physics education research. The results showed that a number of students produced errors and revealed alternative conceptions especially when asking to draw...
Pinning phenomena emerge in many dynamical systems. They are found to stabilize extreme conditions such as superconductivity and superfluidity. In cardiology, lengthened tachycardia correspond to propagating action potential in forms of spiral waves pinned to anatomical obstacles including veins and scares. Thus, elimination such waves is important particularly in medical treatments. We...
In higher education, lecturing has been found as the most prevalent teaching format for large classes. Generally, this format tends not to give the effective learning outcomes. Therefore, to support student learning in the large lecture classes, we developed guided notes containing quotations, blank spaces, pictures, and problems. A guided note taking strategy was selected and has been used in...
Electrocardiogram (ECG) is a crucial tool in the detection of cardiac arrhythmia. It is also often used in a routine physical exam, especially, for elderly people. This graphical representation of electrical activity of heart is obtained by a measurement of voltage at the skin so that the signal is always contaminated by noise from various sources. For a proper interpretation, the quality of...
The objectives of this study were to develop and assess student understanding of measurement and uncertainty. A test has been adapted and translated from the Laboratory Data Analysis Instrument (LDAI) test, consists 20 questions focused on three topics including measures of central tendency, experimental errors and uncertainties, and fitting regression lines. The test were evaluated its...
Development of pesticide sensor based on the ion sensitive field effect transistor (ISFET) was investigated by using acetylcholinesterase which is an enzyme that catalyzes the hydrolysis of acetylcholine to acetate and choline. The ISFET can measure the inhibition reaction of acetylcholinesterase enzyme by the carbaryl pesticide through the pH changed in solution. The acetylcholinesterase was...
We investigate the harvesting of microalgae, living in a culture fluid, by an application of constant electrical current via planar electrodes are made from different materials: aluminum, stainless steel, and graphite. All of these electrodes produce similar fine sub-millimeter bubbles which can levitate the microalgae to the top surface. Unlike graphite, metal sheets are cheap and convenient...
By making use of advanced technique of the near-field Talbot effect, we design a novel spectrometer. Our method provides a compact and portable spectrometer according to the characteristic of the Talbot effect. Here, we propose the idea with the simulations done with reasonable values. With vibration and temperature adjustments, the high resolution over a range of a few nanometers can be obtained.
When ferrofluid is in a presence of external magnetic field, different peak patterns are formed depending upon shape and magnetic field strength of permanent magnets. In this study, 2 dimensional magnetic field distribution from different magnet shapes were mapped and compared with the simulated magnetic field distribution in order to use magnetic field strength at particular location to...
Carbon nanotubes (CNTs) and zinc oxide (ZnO) are one of the most popular materials for gas sensing applications due to its their high electron transfer rate, large specific surface area, promising electronic and structure properties. However, gas sensor based on ZnO nanocluster decorated CNTs is still limited. In this work, we have simulated the models the formation of ZnO nanocluster...
Antibacterial activity of silver nanoparticles (AgNPs) has been attracted many interests in several applications such as food packaging, medical devices, wastewater treatment and textile fabrics. In this work, antifungal activity of AgNPs for natural rubber latex has been investigated. A technique of green AgNPs synthesis route has been presented based on aqueous silver nitrate (AgNO$_3$) and...
The aim of this study was to understand elemental concentration distribution in local longan leaves for revealing whether and how the plant was affected by the environment or agricultural operation since longan trees were normally heavily sprayed with fertilizer and pesticide and chemical residues might be long lasted on the leaves. The analysis was carried out using the MeV-microbeam particle...
Titanium dioxide (TiO2), Titanium nitride (TiN) and Titanium oxynitride (TiNO) are considered as promising material for the medical biology applications. In this study, The properties of biocompatibility on TiO2, TiN and TiNO thin film deposited by dc reactive magnetron sputtering on glass substrate were investigated. The material characterized techniques such as x-ray diffraction (XRD),...
Perovskite Mn-doped CaCu$_3$Ti$_4$O$_{12}$ (CCTO) thin films were prepared by a sol-gel spinning method. The films were deposited one layer at a time and each layer was annealed at 800 $^o$C for an hour. Mn doping concentration in the films was varied in the range of 0-4 wt%. As the Mn doping concentration increases, the crystallite size decreases along with decreasing in the measured FWHM of...
SEM technique was assisted to selected the best condition of 5 wt% Ag doped WO3 nanofiber which synthesized by electrospinning method and calcined at 550 ๐C for 2 hours then were investigated the characteristic via X-ray diffraction, Raman spectroscopy, photoluminescence, UV-visible, FTIR and TEM technique. The results show that is product of orthorhombic Ag-WO3 nanofiber with 60 nm diameter...
Molten droplets are probably generated in a fusion tokamak through splashing of molten layers of plasma-facing surfaces, during transient events such as disruptions and edge localized modes (ELMs) at which surface melting is unavoidable, and melting of solid wall-material debris, i.e. dust/flakes, by heat flux of an energetic fusion plasma. Molten droplets are allowed if plasma-facing...
Light interferometry is one of great non-destructive tools for making a surface profile image of materials. Because of phase difference analyzing method as a Fast Fourier transform (FFT), 3D surface profile image can be constructed from a speckle interferogram of He-Ne laser.[ref] However, 3D image of a surface coated with micro-scale transparent layer cannot be structure by using He-Ne laser...
Transparent conducting thin film is an important layer determining the efficiency of optoelectronic devices. Materials shown the wide-range transparency together with high conductivity are of interest. Among materials providing such optical and electrical properties, metal-doped ZnO is a promising material that gain tremendous attractions. In this work, highly transparent and highly conductive...
The present project had been a collaborative project fully supported from Singha Beverage Company to invent the novel equipment that could both determine dead and living cells with the rapid real-time analysis for on-site operation and most importantly offer the prospect of effective separation of dead vs. live cells. We employed the principle of cell polarizations in AC non-uniform electric...
We investigated superhydrophobic carbon nanoparticles (CNP) films coating on glass slides. The films were deposited by candle soot layers from combustion flames. Contact angle for water droplets increase dramatically from 44.8±4.7˚ for clean glass slides to 157.6±6.6˚ when the glass slides coated by CNP films for 10 seconds. The contact angle of water droplets on CNP samples decreases with...
The purpose of this research was to develop concept and retention rate on energy conservation. The activities included simple and easy experiments. This experiments looks at energy transformation from potential to kinetic energy. The samples were 30 students which were purposively selected from grade 10 in the second semester of the 2016 academic year. The research tools consisted of learning...
We have fabricated dye sensitized solar cells and improved the efficiency of the cells by doping aluminum (Al) in anodization process during synthesizing TiO2 nanotubes (Titania nanotubes). We have studied the microstructure of titania by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Atomic Force Microscopy (AFM), optical property by UV-visible spectroscopy, and the effect of...
The purposes of this research were: to construct packages of operations on buoyancy and the involvement of Newton’s third law, to enhance achievement score of students on buoyancy and the involvement of Newton’s third law , to enhance experimental skills on buoyancy and the involvement of Newton’s third law and to evaluate students’ attitude towards the packages of operations on buoyancy and...
The neutron imaging is a powerful non-destructive technique to investigate the internal structure and provides the information which is different from the conventional X-ray/Gamma radiography. By reconstruction of the obtained 2-dimentional images from the taken different angle around the specimen, the tomographic image can be obtained and it can provide the information in more detail. The...
The purpose of this work was to develop technical analysis of X-ray fluorescence (XRF) and compare with technical neutron activation analysis (NAA). In this study, three samples of tin oxide (SnO) were used to be the reference materials. The results from NAA show the content of tin were 79.39, 77.48 and 73.35 wt%. While the XRF analysis in unnormalized mode show the content of tin were 68.77,...
Diamond-like carbon thin films were prepared by RF magnetron sputtering. Different deposition conditions were experimented. The main variable parameters were the argon flow rate, RF power and bias voltage. The carbon films were characterized by photoemission spectroscopy and soft X-ray absorption spectroscopy. In this report, the results from the measurements will be reported and discussed.
The Thick lenses was developed and fabricated by DIY (Do it yourself) Low Cost process that applied teaching the focal length for parallel light rays passing through lenses in either direction in Physics, to increase good achievement and attitude of students. This instrument kit was made form transparent acrylic Perspex thickness of 2 mm. It was cut rectangle form an area the size 2x15 cm2 and...
Dielectric Barriers Discharge (DBD) plasmas is a cold plasma that can be generated in atmospheric pressure, thus allows it to be used on various applications. In this work, DBD plasmas will be used for treating egg shell. The results in terms of surface modification will be presented.
The effect of various annealing treatments on the structure properties of crystalline silicon (c-Si) produced by the inverted aluminum induced crystallization of amorphous silicon (a-Si) films was studied. The surface morphology and grain size of c-Si films were observed by optical microscope, SEM and AFM. X-ray diffraction and Raman spectroscopy were used to study quantity of Si...
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...
In this study, different surface morphologies of MnO$_2$ (rod, wire, urchin and tube-like MnO$_2$) with an $\alpha$-phase crystalline structure were synthesized via a hydrothermal process by adding various reagents. The crystalline structure and morphology were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, the electrochemical properties...
Electrical cell lysis is an important technique in obtaining intracellular components for further analysis. In this research, three different array of shapes; comb, triangle, rectangle; of indium tin oxide (ITO) were fabricated for cell lysis in microfluidic systems. Paramecium sp. cells were used in visualizing cell disruption due to the application of 12 V$_\text{p-p}$ AC voltage between...
A TiO$_2$ compact layer or blocking layer plays a crucial role in a hybrid organic-inorganic lead halide perovskite solar cells because it can prevent the carrier recombination at the interface of fluorine-doped tin oxide (FTO) and perovskite layers. There are many methods to fabricate this layer such as spray pyrolysis or spin-coating which is solution-based synthesis that is difficult to...
Titanium nitride coatings have been used very successfully in a variety of applications because of their excellent properties, such as the high hardness meaning good wear resistance and also used for covering medical implants. Hydroxyapatite is a bioactive ceramic that contributes to the restoration of bone tissue, which together with titanium nitride may contribute to obtaining a superior...
In this work, carbon sphere films at different growth temperature of 180, 200 and 220°C were synthesized by 10 hrs hydrothermal process from glucose to apply for supercapacitor electrode. The carbon sphere films were washed and filled by DI water for several times. Finally, they were kept it in an oven at 80°C to dry. Crystal structure and film morphology were analyzed by X-ray diffraction,...
First-principles calculations based on density functional theory (DFT) have been performed to study the adsorption of molecular H$_2$ on the graphene-like material C$_2$N. The possible adsorption sites on top of bonds, on carbon atom and nitrogen atom and the center of C-C hexagon and the C-N hexagon are considered. The adsorption energies for each site are calculated and are found to be in...
Fission product behaviors of Cs, a major element released in a severe nuclear accident, still remain unclear. The question frequently addressed is whether Cs released will be in the form of CsMoO$_4$ or CsOH. This is a challenging issue since it has been demonstrated that the reaction between CsMoO$_4$ and water leading to CsOH production is thermodynamically favored. The present research aims...
An important aspect of musical structure that allows discrimination between different sounds is the timbral characteristic. Although, there has been significant interest in the application of fractal theory as a tool for the analysis of musical structure, no such study has been done to investigate timbre on physical modeling sound synthesis. In this paper, we examine the changes of timbre and...
The purpose of this study was to evaluate the radionuclide concentrations of London blue topaz after fast neutron irradiation. The London blue topaz was obtained from Sri Lanka which classified into dark and light colors in the shape of an oval and rectangle with small, medium and large size. The optical property and radionuclide concentrations of London blue topaz have been examine by UV -...
Nickel-doped calcium copper titanate (CaCu3Ti4O12: CCTO) thin films were synthesized by a sol-gel method. All films were spin-coated with four layers on silicon and alumina substrates, and each film layer was annealed at a fixed annealing temperature of 800 °C. The obtained samples with different doping concentrations (0-7.27 wt%) were characterized by X-ray...
Polymer solar cells is one of the promising technologies that gain tremendous attentions in the field of renewable energy. Optimization of thickness for each layer is an important factor determining the efficiency of the solar cells. In this work, the optimum thickness of Poly(3,4-ethylenedioxythione) : poly(styrenesulfonate) (PEDOT:PSS), a famous material widely used as hole transporting...
The measurement of moisture content in soil is based on the principle of neutron back scattering. In this principle, when fast neutrons emitted from a radioactive source collide with hydrogen atoms their energies are much greater reduced than colliding with other atoms. The number of slowed down neutrons, hence, represents the number of hydrogen atoms present in the vicinity of the source. As...
Metal-insulator transitions (MIT) are reversible changes in the conductivity of materials when the temperature above or below the transition point, which are the smart transitions in advanced material. Vanadium oxide (V$_\text{x}$O$_\text{y}$) demonstrated excellent MIT characteristics at the transition temperature (T$_\text{c}$) due to the lattice distortion. However, V$_\text{x}$O$_\text{y}$...
Optical vortex is a mode of light whose phase distribution varies as e$^{im\phi }$, where m is called the topological charge of the vortex and ${\phi}$ is an azimuthal angle in the plane perpendicular to the propagating direction. The vortex beam of charge m carries an orbital angular momentum of mℏ and has its application in manipulating micrometer-sized particles. A common method to detect...
The scientists once believed an atom was the smallest particle, nothing was smaller than this tiny particle. Later, they discovered an atom which consists of protons, neutrons and electrons, and they believed that these particles cannot be broken into the smaller particles. According to advanced technology, the scientists have discovered these particles are consist of a smaller particles. The...
Liposomes are phospholipid vesicles enclosing aqueous solution. Liposomes are used in many biomedical applications such as drug delivery and artificial cell models. Giant unilamellar vesicles (GUVs) fabrication using vortex ring in microfluidic device offers advantages over traditional GUVs fabrications such as rapid fabrication and controllable uniform vesicle sizes distribution. The...
ABSTRACT
3D carbon nanofiber scaffolding was produced from the pyrolysis of freeze-dried (FD) bacterial cellulose (BC). The thermogravimetry and differential thermal analysis (TG/DTA) showed the weight loss of BC during the pyrolysis process. The X-ray diffraction technique showed the high crystallinity of the FD-BC and the high amorphousness of the carbon nanofibers. Both FD-BC and the...
The Specific Activities of $^{40}$K, $^{226}$Ra and $^{232}$Th were determinet for 30 beach sand samples collected from Talo kapo beach Yaring District in Pattani Province. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system. Gamma ray radioactive standard sources $^{137}$Cs and $^{60}$Co ware used to calibrate the...
Mechanical properties of cement paste containing iron powder
Nattapong Chuewongkam1, Panjasil Payakaniti2,Supree Pinitsoontorn1,2,3
1Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002 THAILAND
2 Materials Science and Nanotechnology Program, Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002, Thailand
3Integrated Nanotechnology Research...
Electroporation is the technique in which external electrical field is applied across cells of interest to create pores on cell membrane when the voltage across the cell membrane is high enough. Electroporation is commonly used to deliver exogenous reagents such as genes, drugs, and nanoparticles for therapeutic purposes. In this work, microfluidic device was fabricated using Printed Circuit...
CaCu$_3$Ti$_4$O$_{12}$(CCTO)/SrTiO$_3$(STO) and CaCu$_3$Ti$_4$O$_{12}$(CCTO)/BaTiO$_3$(BTO) films multilayered heterostructures were successfully synthesized on LaAlO$_3$ (LAO) (100) substrates via a sol-gel method. The annealing temperature was fixed at 800 °C for one hour for each deposition. Our films were deposited with conditions as follows; CCTO/CCTO/CCTO/CCTO, STO/STO/STO/STO,...
With the realization of widespread use of large quantities of sex reversal hormone of the synthetic androgen 17Alpha-methyltestosterone (MT) affect on the environment and the inefficiency and cost of the conventional techniques, the hormonal sex reversal of economic fish needs to modified to avoid the excess use of MT, lessen the duration of treatment and lower the cost of MT hormone used...
Ag-doped CaCu3Ti4O12 (CCTO) thin films with different doping concentrations were prepared by a sol-gel technique. Films were grown by depositing four layers of CCTO on alumina substrates followed by sputtering Au/Cr interdigitated electrodes to fabricate gas sensors. The films were characterized by X-ray diffraction (XRD), field emission scanning electron...
ABSTRACT
Spin Seebeck effect (SSE) can be observed in magnetized ferromagnetic materials when subjected to a temperature gradient.In this work, the results on the SSE in the bulk strontium ferrite were demonstrated for the first time. The SSE measurement was developed in our lab and calibrated with a Y3Fe5O12 standard sample. The bulk strontium ferrite was characterized for the crystal...
The purpose of this work is to build a physics lab apparatus that is modern, low-cost and simple. In one dimensional two-body collisions experiment, we used the Arduino UNO R3 as a data acquisition system which was controlled by LabVIEW program. The photo gate sensors were designed using LED and LDR to measure position as a function of the time. Aluminum frame housewares and blower were used...
Nickel sulfide (NiS) nanoparticles were grew on multiwall carbon nanotube (CNTs) and coated onto FTO-glass by the one step hydrothermal method at 160°C. These films were applied as counter electrodes (CE) for dye-sensitized solar cells (DSSCs). In the present work, electrocatalytic activity and electron-charge transfer resistance are investigated though cyclic voltammetry and electrochemical...
ZnS, a wide band gap semiconductor and good candidate for dye sensitized semiconductor solar cell (DSSC) photoanode was doped with aluminum. However, the role of ZnS and Al-doped ZnS in DSSC is lack of knowledge. Herein, we studied the effect of ZnS and Al-doped ZnS in TiO$_2 photoanode using a simplest preparation. The thin film was prepared by doctor blade technique using a mixture of TiO$_2...
Titanium dioxide (TiO$_2$) thin films have been generally accepted as an important material in the fields of photocatalysis, photovoltaic and photochromic. The efficiency of TiO$_2$ films as an active layer in various applications strongly depends on their optical properties. In this present study, the optical properties of sputtered TiO$_2$ thin films were modified using nanoparticles gold...
The microring resonators have potential applications for the photonic integrated circuits. The dynamical phenomena of the two coupled microrings require a simple and efficient numerical formalism for solution of the system. We present a simplified theory of the optical tristability inside the two coupled microrings that take into account Kerr nonlinearity and the effect of loss. We also...
Thermoluminescence properties of Thai commercial window glass provided by Guardian Industries Corporation (denoted as WG) were studied. WG was doped with varying concentrations of ZnO The composition of glass is 90WG-10Na2O-xZnO (where x = 0.000, 0.001, 0.010, 0.100, 1.000 mol%). Glass samples were recycled by using melt quenching technique and cut into the dimensions of 6×6×1 mm3. After...
Beta cyclodextrin (βCD) and its derivatives such as methylated βCD (MEβCD) and hydroxypropyl βCD (HPβCD) have been widely used to improve the solubility and the stability of poor water soluble drugs. Most drugs are completely bound inside the hydrophobic cavity interior of the βCDs. In the present work, we studied the pre-step of drugs releasing based on drug-βCDs complexes. The interaction...
In this work, hydroxyapatite (HA) and hydroxyapatite doped with Sr (HA-Sr), Zn (HA-Zn) and both Sr-Zn (HA-SrZn) were synthesized by a sol-gel method and combined with polycaprolactone (PCL) to make HA/PCL composites using an electrospinning technique. The synthesized nanoparticles and their composite fibers were investigated using various techniques. The X-Ray Diffraction (XRD) result showed...
In this work, the motion of a particle in one dimension, under the influence of the potential well that is modeled as the linear downward of length $L$ with a finite depth $|V_{0}|,$ is studied within the context of the non-relativistic quantum mechanics. The attention is paid on the paradoxical phenomenon of the reflection of a particle that is in contrast between classical and quantum...
Connecting physics concepts with that interest activities or with activities that interest. Thought will allow students strong to build a foundation. When an event of interest to the students, it will contribute to the students' responses, engaged and enthusiasm for learning. Learning activities resulting from things that interest and have found on a regular basis can have a lasting and...
In this work, we developed an innovative physics lab apparatus that is modern, cheap and simple. The ultrasonic sensor was used to measure the position of a mass attached on a spring as a function of time. The data acquisition system and control device were developed based on LabVIEW interface with Arduino. The experimental was designed to explain the simple harmonics motion similar to the...
The present study proposes another alternative approach to model the geometry of Nile tilapia egg for evaluation of the induced transmembrane potential. The actual shape of tilapia egg is an asymmetrical prolate spheroid with a short prolate spheroid bottom and a more elongate prolate spheroid at the top with a common equator rather than a symmetrical prolate spheroid. Unfortunately, the...
Schlieren photography is a technique used to visualize density gradient of fluid medium, which is due to a linear relationship between fluid density and refractive indices. In this study, a single mirror off-axis schlieren system was employed to observe minimum temperature difference between room and heated object, vacuum flask.The tracker program was used in measuring relative light...
Silicon Carbide (SiC) is the chemical compound of carbon and silicon. Recognized as a perfect semiconductor with superior characteristics, SiC is widely used in high-temperature, high-power, and high-frequency electronic applications. Defects in a semiconductor have become a primary important issue since they can damage and change the unwanted electrical properties. The study of geometric and...
The bulk heterojunction solar cell has been developed for many decades. The electron acceptor is one of the key performance in this solar cells, typically using fullerene derivatives. However, the free fullerene solar cell has been proposed using difference acceptor molecule. Herein, the morphology in bulk heterojunction PCDTBT:Perylene thin films of varied stoichiometry (1:1, 1:2 and 1:4...
The preparation of nanocomposites materials by using Polydimethylsiloxane (PDMS) with metal nanoparticles (gold and silver) and metal oxide nanoparticles (Zinc oxide and Titanium dioxide). Then, Characterization of the films was carried out by atomic force microscope (AFM) and fourier transform infrared spectroscopy (FTIR) after that the film creates to the electrodes on the film for applying...
The g-sensor with a wireless, using to study motion of hollow PVC-cylindrical on incline plane.This sensor will packed inside PVC-cylindrical. For experimental,We drop the PVC-cylindrical on the top of incline plane length 1.2 m.By changed high of plane at 3.5, 4.5, 5, 5.5, 6 and 6.5 cm relate to angle 0.0318, 0.0409, 0.0454, 0.0499, 0.0545 and 0.0590 rad respectively. The signal from the...
We aim to fabricate formaldehyde gas sensors for identifying formalin contamination of fresh raw food materials, especially seafood. Carbon nanotubes (CNTs) are one of materials widely used for fabrication of gas sensors because of their unique electronic properties. Unfortunately, pristine CNTs exhibit very low sensitivity for formaldehyde molecule adsorption. In this research, we have used...
One of the most important part of the Prompt Gamma Neutron Activation Analysis system (PGNAA) is the High Purity Germanium detector (HPGe). In this paper, the calibrations of an HPGe detector were made with the isotopic source $^{152}$Eu. The same detector was modelled in the MCNP5 and simulated. The thickness of the dead layer was determined. The simulated and experimental efficiency over the...
On the basis of electrical induction of eggs for sex reversal, the egg membrane exposed to a very short high-intensity electric field pulses can be temporarily permeable in specific regions of the egg. During the destabilization period, the membrane is highly permeable to exogeneous molecules present in the surrounding medium. Optimization of protocols has led to a situation where high egg...
In this study, the composition of sticky rice was studied using NMR relaxometry. Because the rice seeds have several elements, the NMR signal is multiexponential decay. However, its components that yield NMR signals can be separated by using Inverse Laplace Transform method. This method is data analyze by from least squares algorithms. The Downhill Simplex method was used to find the variable...
Measuring surface water wave properties such as amplitude and wavelength can be difficult when the wave amplitude is very small. The digital image correlation (DIC) MATLAB program makes it possible to analyze such surface wave properties. The technique relies on analyzing of pattern displacement images due to surface perturbation of random patterns at the bottom of the water container. This...
CaCu$_3$Ti$_4$O$_1$$_2$ powders were synthesized by modified Sol-gel method with Hydrothermal using Ca(NO$_3$)$_2$• 4H$_2$O, Cu(NO$_3$)$_2$• 3H$_2$O, Ti(OC$_3$H$_7$)$_4$ and freshly extracted egg white (ovalbumin) in aqueous medium. The precursor was calcined at 800, 900 and 1000 °C in air for 8 h to obtain nanocrystalline powders of CaCu$_3$Ti$_4$O$_1$$_2$. The calcined...
The determination of the energy values, specifically the heat of combustion of various M-16 black powders werethe important part of the bulletefficiency investigations. The calorimetric bomb is commonly used for these determinations. Four M-16 black powders from the differences sources were used as samples for this research. It was found that,after using calorimetric bomb technique, the gross...
The effects of Fe-doping concentration in Ba$_{(1-x)}$Fe$_{x}$TiO$_{3}$ (x=0, 0.02, 0.04, 0.06 and 0.08) thin films prepared by a sol-gel method on their microstructure and magnetic properties were systematically studied. From X-ray diffraction measurements, the full width at half maximum (FWHM) of peaks were increased as the doping concentration increased. The thickness of the films measured...
Alternative energy tends to be more widespread in Thailand because the advanced technologies enhance the potential of equipment which becomes more economically rather than setting in laboratory likes in the past. For this reason students should understand profoundly about the characteristic of energy before they learn about alternative energy. To help students get more comprehension about the...
Abstract: The aim of this work was to study the effect of preparational factors such as solvent type, polymer concentration, evaporation time (ET) and non-solvent additive, on the morphological structure, physical and gas separation properties of the prepared membrane samples by tuning of these parameters. Flat sheet asymmetric polysulfone (PSF) membranes were prepared by the dry/wet phase...
The analysis of electrical inductions of O.niloticus egg’s membrane is based on the transmembrane potential, induced due to applied electric field. The implication of the analytical model has been interpreted in terms of understanding the influence of egg size, pulse duration and electro-physical conditions of eggs on the E-field parameters (strength and duration) required for electroporation....
Living yeast cells in the brewery industry are active cells. They have different responses to AC electric field if they possess different dielectric properties. Electrical parameters which are used to determine health of yeast cells are the conductivities of the cytoplasm (CC), the cell membrane (MC), dielectric constant of the membrane and the cytoplasm, respectively. These parameters affect...
In this paper, we aim to characterize the microstructure of Yttrium doped TiO$_2$ nanotubes. These were successfully synthesized by anodization method on Ti sheets. The electrolyte was composed of ethylene glycol (EG), ammonium fluoride (0.3 % wt NH$_4$F) and deionized water (2% vol H$_2$O) with different concentrations of dopant Y$_2$O$_3$. A constant DC power supply of 50 V was used during...
This paper reviews recent progress in the digital holographic 3D imaging spectrometry. The principle of this method is a marriage of incoherent holography and Fourier transform spectroscopy. Review includes principle, procedure of signal processing and experimental results to obtain a multispectral set of 3D images for spatially incoherent, polychromatic objects.
Nanoparticle thin films have a vast range of applications in various fields due to their superior properties. There are a number of methods for nanoparticle thin film coatings, for example spray pyrolysis, electrodeposition, spin coating and sol-gel process. However, these methods are either a multistep synthesis or require the use of toxic substances. The sparking method is a onestep, simple...
In magnetized plasma systems, magnetic reconnection is the most important process in converting the magnetic energy into the kinetic energy of plasma. It is conventionally thought that the outflow speed and the reconnection rate depend only on the strength of the upstream magnetic field and the upstream plasma density. However, using fully kinetic particle-in-cell simulations of collisionless...
In this research, we demonstrate a colorimetric plasmon sensor for the determination of mercury ions, which are toxic heavy metal ions. Colorimetric detection by the naked eye is certainly the most simple and convenient diagnostic method, especially when it does not require any complex optical or electrical systems. Colorimetric method using gold nanoparticles (AuNPs) is based on changes in...
This work investigates performance optimization of ITER and DEMO plasmas in the presence of internal transport barrier. The optimization is carried out using simulation results of BALDUR integrated predictive modelling code. In these simulations, a combination of a neoclassical transport model NCLASS and an anomalous transport model Multimode model is used. The boundary condition is described...
Pure natural rubber (NR) has low durability and elasticity, which become a major bottleneck for practical use. To overcome the limitation, in general, the adding of carbon black and silica particles is applied$^{1,2}$, but carbon black has an effect of polymer cracking. Interestingly, the fullerene (C60) and carbon nanotube (CNT) can be used as rubber additive, resulting in the significant...
The impacts of pellet mass ablation and deposition that consider the effect of the
particle drift due to the gradient of magnetic field are investigated for
International Thermonuclear Experimental Reactor (ITER) and Demonstration
Nuclear Fusion Power Stations (DEMOs). In the core area, the plasma profiles are
predicted by the TASK/TR code in which the core transport models consist of...
Lead halide perovskite solar cells (PVSCs) have been exhibiting high efficiency by using abundant materials and availability on flexible substrates with easy fabrication process. However, to fabricate the perovskite devices for large area are facing many problems such as surface coverage and quality of perovskite crystalline thin film. Here, we report the way to fabricate perovskite solar cell...
Silicon-based photonics has generated a strong interest in recent years, mainly for optical telecommunications and optical interconnects in integrated circuits. The main rationales of silicon photonics are the reduction of photonic system costs and the increase of the number of functionalities on the same chip combining photonics and electronics. Waveguide-integrated silicon...
This research study plasma performance in fusion Tokamak system by investigating parameters such as central plasma pressure and particle density in the presence of an ETB (edge transport barrier) and an ITB (internal transport barrier). The plasma is modeled based on bifurcation concept using a suppression function that can result in formation of transport barriers. In this model, thermal and...
The presence of $\beta$-Cu(In,Ga)$_3$Se$_5$ phase on Cu-poor Cu(In,Ga)Se$_2$ thin film surface could play an important role in the efficiencies of Cu(In,Ga)Se$_2$ thin film solar cells. The $\beta$-Cu(In,Ga)$_3$Se$_5$ with various thicknesses were deposited after a completion of the three-stage co-evaporation process of Cu(In,Ga)Se$_2$ films. The optical absorption measurement is used to...
A plasma focus (PF) device is device to generate plasma which is applied in ion acceleration, material surface modification and fusion reaction source. For plasma fusion is interest topic to study. Calculating plasma parameters such as plasma density and plasma temperature is importance to find the optimum condition for their applications. In this research uses Lee model code to calculate the...
In this research, we describe the construction of a compact transmission Raman spectroscopy that has been developed for on-site determination of chemical analysis. The system consists of an inexpensive green laser pointer emitting less than 20 mW of 532 nm radiation used for excitation, a notch filter for blocking light around 532 nm and a portable spectrometer (Avantes, AvaSpec-ULS3648 ) for...
Laser-produced plasma experiments are widely conducted for several purposes ranging from using for initial confinement plasma to the comparison with supernovae. The experiments themselves cannot tell the underlying microscopic phenomena therefore we use particle-in-cell simulations to demonstrate the dynamics of particles and electromagnetic fields. In this work, we focus on the energy...
In this work, bacterial cellulose (BC) was biosynthesized by Glucanobacter xylinum bacteria. Fe$_{3}$O$_{4}$ nanoparticles under different concentrations were ex-situ impregnated into the BC structure. The BC pellicles in both never-dried and freeze-dried states were used as the templates to form BC-Fe$_{3}$O$_{4}$ nano-composites. Morphological studies of the samples indicated that the...
Heart rate monitoring via optically remote noncontact technique was reported in this research. A green laser (5mW, 532 ± 10 nm) was projected onto the left carotid artery. The reflected laser light on the screen carried the deviation of the interference patterns. The interference patterns were recorded by the digital camera (Canon EOS 1100D).The recorded videos of the interference patterns...
The Deuterium-Tritium (DT) reaction is the key reaction in fusion reactors; leading to neutron and helium production. Most of the fusion energy (>80%) in such reaction is carried away by neutron. Conversion of neutron kinetic energy to any other usable form is very important for power generation in fusion reactors. The successful reactor design is thus highly dependent on this energy...
A stacked fishnet metamaterial with a unit cell comprising a metallic hole-array layer and an insulator layer has been expected to exhibit hyperbolic dispersion. Here, we propose new closed-form formulae of effective parameters of the stacked fishnet metamaterial working at long-wavelength regime. These simple effective parameters are derived by applying the coupled-mode analysis to obtain the...
The anti-reflective (AR) coatings have been regarded as one of the promising options to improving an efficiency of light transmission. In this research, we design the ultra-high anti-reflective layer structure. By using the specification properties of 1D photonic crystal, the periodical stack layer of tantalum pentoxide (Ta$_2$O$_5$) and molybdenum disulfide (MoS$_2$) in borosilicate glass...
Most of the matter in the universe is invisible and is known as dark matter (DM). Weakly Interacting Massive Particles (WIMPs) are possible theoretical candidates to explain DM. Hypothetically, WIMPs can be detected indirectly by their annihilation or decay products. A possible product is gamma ray. Many DM profile models predict higher density of WIMPs near the Galactic center. In this work,...
Cosmic rays are high energy particles traveling nearly the speed of light through space. When cosmic rays enter the earth’s atmosphere, they interact with nucleons and start a chain reactions that produce showers of secondary particles, including neutrons, that can reach the surface These neutrons are detected by neutron monitors placed around the globe. The number of neutrons recorded by a...
Aurora phenomenon is an effect of collision between precipitating particles with gyromotion along Earth’s magnetic field and Earth’s ionospheric atoms or molecules. The particles’ precipitation occurs normally around polar regions. However, some auroral particles can reach lower latitude regions when they are highly energetic. A clear emission from Earth’s aurora is mostly from atomic oxygen....
At present, over 3,500 exoplanets have been discovered. In addition to the discovery of new exoplanets, the characterization of planetary atmosphere is a rapidly developing area. One method that is used to study planetary atmosphere is transmission spectroscopy, which measures the variation of transit depth with wavelength. Inflated exoplanets are favorable for transmission spectroscopy, due...
The first non-centrosymmetric heavy fermion superconductor CePt$_3$Si [1], crystallizing with CePt$_3$B -type, without an inversion symmetry (one of the key symmetries for Cooper pairing) shows a number of novel physical properties. In order to get insight into the pressure dependence of the strong electron correlations in these materials the present paper provides mechanical property data...
Nano fluids are engineered colloidal suspensions of nanoparticles in a base fluid. These nanoparticles are typically made of carbides or carbon nanotubes, metals, oxides and so on. Nanofluids are potential heat transfer fluids with enhanced thermo physical properties and heat transfer performance can be applied in many devices for better performances (i.e. energy, heat transfer and other...
Quasars are a type of AGN with extremely bright luminosities in the optical region of the spectrum which are powered from the accretion process of in-falling matter into the SMBH near the center. This process creates notable features in the AGN spectrum including very broad emission lines which are emitted from the Broad-Line Region (BLR) outside of the SMBH. Although the geometry and the...
Gallium nitride doped with small concentration of manganese (GaxMn1-xN) is one of the most diluted magnetic semiconductors which used for the spintronic applications. In this work, the Ga31Mn1N32 in the zinc-blende (ZB) and rocksalt (RS) structures were investigated. We employed the ab-initio density functional theory (DFT) within the...
Neutron monitors are ground-level detectors of cosmic ray-induced atmospheric secondary particles (mostly neutrons) that are employed world-wide to study variations in the flux of galactic cosmic rays and solar energetic particles in the GeV regime. The neutron monitor standard design (NM64) minimizes detector response to neutrons below $\sim$10 MeV produced by cosmic ray interactions in the...
The diameter measurement of sphere is very important in dimensional metrology. The measurement of diameter is generally carried out by a comparison method or direct method using 1D linear measuring system. The probes touch both sides of the workpiece and the diameter is determined from displacement of the probes. The contact force is generally operated at 1N which yield deformation due to...
The discovery of a two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface has set a new platform for all-oxide electronics which could potentially exhibit the interplay among charge, spin, orbital, superconductivity, ferromagnetism and ferroelectricity. In this work, by using angle-resolved photoemission spectroscopy and conductivity measurement, we have studied the behavior of...
Proxima Centauri (type – M5.5V, 3050K) is a red dwarf only 4 light yr away, whereas the Sun is type G2V (5780 K). Could oxygenic and/or anoxygenic photosynthesis exist on planet Proxima Centauri b and would we be able to detect it? The light regimes on Earth and Proxima Centauri b are compared to estimate the planet’s suitability for Chlorophyll a (Chl a) and Chl d-based oxygenic...
The local gravity measurement using relative gravimeter was confirmed to the reference absolute gravity station by National Institute of Metrology (Thailand); NIMT. Five known absolute gravity value stations were used in this confirmation. By applying the A-B-A measurement pattern, the time dependent of the relative gravity value at the reference station was calculated. Then the short term...
The launch of the Fermi satellite in 2008 revolutionized gamma-ray pulsar astronomy
by enabling the discovery of many new millisecond pulsars (MSPs). The Fermi
Pulsar Search Consortium (PSC) has organized hundreds of radio observations of
pulsar-like Large Area Telescope (LAT) unassociated sources. Over the past seven
years, the PSC has discovered more than 70 new MSPs,...
The LVDT probe is a very important component used in gauge blocks calibration via a mechanical comparative method. The probe is used to determine the central length difference between a reference gauge block and gauge block under-tested (UTC). Typically, an UTC and a reference gauge block have the same nominal length. However, some gauge blocks UTC are specially made for specific purpose...
In microelectronic industry, lithography and patterning by using ions bombard on the surface to remove atoms of material is a very important process. In data storage manufacturing, ion etching process is chosen to prepare a specific pattern under the read-write head of the hard disk drive (HDD) to form an “air bearing surface” or ABS. This makes the HDD head can float or slide over the surface...
Since Einstein’s general relativity or GR cannot explain our universe completely, physicists have tried to find the theory which can describe the dynamic of the universe. One of attempts is modification of GR or modified gravity. We are interested in two models of modified gravity. The first one is the higher dimensional gravity theory which explains the nature by considering GR with extra...
Surface finishing is an important process for manufacturing industries. Precise surface roughness measurement is crucial as it has a direct effect on surface quality. In Thailand, the National Institute of Metrology of Thailand (NIMT) provides reference roughness standards and roughness measuring instruments. NIMT also conduct Proficiency Testing (PT), which is an important process for...
Thermoelectric materials have the ability to convert a heat flow into an electrical charge carrier flow (energy flow). TiNiSn-based thermoelectric half-Heusler phases (noncentrosymmetric, cubic MgAgAs-type) have proven to be excellent thermoelectrics. The large-scale production and particularly nanostructuring of materials by preferably system-inherent phases need a profound knowledge not only...
Traversable wormhole or Morris-Thorne wormhole is one of wormholes to which human can travel. However, an exotic matter, the matter with negative pressure, must be included in order to construct such the wormhole. By introducing the cosmological constant into general relativity, it was found that one can minimize the existence of the exotic matter to a thin shell. In this presentation, we...
The prototype of depth calibration standard machine was fabricated to calibrate the depth of indentation for elastomer hardness tester. According to ISO 18898, ASTM D2240 and ASTM D1415, the measurement of indentation depth by a measuring device comprising a length-measuring system shall be in reference with the pressure foot of the elastomer hardness tester. Nation Institute of Metrology...
Synchrotron emission is a good probe for dark matter (DM) particles in the Universe. We search for DM annihilation signals in the Milky Way by using Planck data of synchrotron emission in the microwave bands. We investigate the production of dark matter annihilation into electrons and positrons by studying different channels. We look for upper limits of the mass of dark matter particles on the...
The light shone upon hybrid organic−inorganic perovskite (HOIP) has never been brighter. Many researchers have claimed that this material could hold the key to the new era of photovoltaic technology, owing to its efficiency, both energetically and economically. Despite all its merits, perovskite solar cell is plagued by an indispensable draw back; it degrades precipitously under sunlight. Not...
Capacitively Coupled Contactless Conductivity Detection (C4D) technique for particle detection or flow cytometry has been increasingly interested. This detection technique in microfluidic system utilizes two electrodes, excitation and pick-up electrodes, which are not directly in contact with solution in microchannel. In this study, Particulate of different sizes suspended in DI water were...
Radial velocity observations for members of the Ori OB1d association in the nebula NGC 1977 were obtained using the MRES spectrograph with the 2.4 m telescope at Thai National Observatory. Radial velocities of 2MASS J05352174-0453118, HD37059, HD294264 are detectable for the first time with a value of 30.02, 32.19 and 60.27 km/s, respectively. Combining the obtained radial velocities from this...
Complex oxides host a wide variety of interesting physical properties, including charge localization in the form of small polarons, magnetism,ferroelectricity, giant magnetoresistance, and high-Tc superconductivity. In this presentation we discuss how doping can modify the properties of complex oxides, for instance by transforming a band insulator into a Mott insulator. We discuss results of...
In this paper, installation automatic die bonding machine and optimization parameters were studied in die attach process for integrated circuit (IC) packaging. Die attach process is one that is very important IC packaging manufacturing. This process is attaching a die or chip take to leadframe or substrate using die bonding machine. After installation machine, the parameters of equipment...
AS Eridani is a 2.664152 day, semi-detached Algol type binary system. Gamarova, Mkrtichian & Kusakin (2000) discovered a short-period 24 min pulsation in a primary mass-accreting component. The oscillation spectrum has been investigated by Mkrtichian et al. (2004), they suggested that AS Eri is a promising pulsating star for further detailed investigations.
We started a new campaign of...
The Rockwell hardness test penetrated depth normally not more than 0.260 mm. Using commercial load cell cannot achieve the force calibration proposed. For these reasons, the high stiffness load cell fabrication, HSL is subject. Its obviously advantage is deformed less than 0.020 mm at 150 kgf maximum load applied. The HSL prototype was designed in concept of direct compression then confirmed...
Wiangkalong is one of major ceramic production cities in northern of Thailand, once colonized by the ancient Lanna Kingdom (1290 A.D.). Ancient Wiangkalong potteries were produced with shapes and designs as similar as those of the Chinese Yuan and Ming Dynasties. Due to the complex nature of materials and objects, extremely sensitive, spatially resolved, multi-elemental and versatile...
We study non-Gaussianities in primordial perturbations by using the Delta-N approach to avoid the complexity of solving differential equations for non-linear perturbations directly. we have shown, for the case of the double massive inflation with the arbitrary constant metric in the field space, even the mass of two scalar fields are equal, the non-Gaussianity parameter may not vanish....
The nest bar, or length bar, is a standard bar with two kinematic seats. The center-to-center length between seats is used as standard length for detecting geometric and thermal errors of an articulated arm coordinate measuring machine (Arm CMM) according to the guidance of ISO 10360-12:2016. Each seat shall be a kinematic seat where the center of the ball probe may be repeatedly positioned in...
Photocathode RF electron guns are widely used at many laboratories because of the high quality of the produced electron beams. By using a short-pulse laser to induce the photoemission process, the electrons are emitted with low energy spread. Moreover, the photocathode RF guns are not suffered from the electron backbombardment effect, which can cause the limited electron current density. In...
The industrial processes for high-precision engineering and metrology require the fine quality control of products. The precision of rotary spindle is also required to enhance the accuracy of spindle motions to the nanometer and sub-µradian levels. Spindle measurements by conventional methods will have contributions from the spindle motion error and the form error of the target artifact. In...
A linac-based MIR/THz free-electron laser facility is under the development at the Plasma and Beam Physics Research Facility, Chiang Mai University. The ultimate goal of the project is to generate the infrared radiation covering wavelengths from about 10 to 125 micron. The main applications of the radiation in this wavelength range involve MIR/THz imaging and spectroscopy. The future FEL...
Andor is a global leader in the development and manufacturing of high performance scientific imaging cameras, spectroscopy solutions and microscopy systems to match your application needs in research and OEM.
The prsentation will brief introduce camera technologies, including Electron Multiplying CCD (EMCCD) cameras, Scientific CMOS (SCMOS) cameras, CCD cameras and Intensified cameras .We...
The development of a measurement system for non-destructive testing of magnetic force microscopy (MFM) probes is discussed in this paper. Typical MFM probes are characterized by equipped in a conventional atomic force microscope (AFM). Test parameters are the resonance frequency of MFM probes and its response to a magnetic stray field from a standard test sample. This procedure involves...
Our ability to completely understand the size of the proton has come into question. This puzzle is presently unsolved. It has been building up since 2010 when a measurement of the Lamb shift in muonic hydrogen yielded a very precise value$^1$ for the electric charge radius of the proton equal to $\langle$r$^2$$_E$$\rangle$$^{1/2}$ = 0.84087(39) fm with an amazing 0.1% uncertainty. This...
Workability, compressive strength and electrical properties of high calcium (Class C) fly ash geopolymer composited with short carbon fibre (CF) were investigated. The liquid to ash (L/A) ratio was kept at 0.4, while the carbon fibre concentration, curing temperature and age of the specimens were varied. The fibre content was in a range of 0-0.5%CF. The curing temperature was 25°C and 60°C and...
Neutron monitor (NM) and Bare (lead-free) neutron counters are ground-based detectors to detect the variation of intensity in cosmic rays. In addition, the bare detector to neutron monitor count rate ratio (Bare/NM) provides information on the cosmic ray spectrum. In the present work, we utilized data from the Princess Sirindhorn Neutron Monitor station at Doi Inthanon, Thailand, with the...
In this work, we investigate the giant dielectric properties of (Ga0.5Nb0.5)xTi1-xO2(where x=0.01, 0.025, 0.05 and 0.1) prepared by a solid state reaction method.The phase composition,microstructure,and oxidation statesare characterized by X-ray diffraction, field-emission scanning electron microscopy and X-ray photoelectron spectroscopy, respectively.The single phase of rutile-TiO2with dense...
We study the cosmology of a recent model of supersymmetry breaking,
in the presence of a tuneable positive cosmological constant, based on a
gauged shift symmetry of a string modulus that can be identified with
the string dilaton. The minimal spectrum of the ‘hidden’ supersymmetry
breaking sector consists then of a vector multiplet that gauges the shift
symmetry of the dilaton multiplet and...
An optimum cumulus parameterization scheme was determined for the Weather Research and Forecasting (WRF) model for Northern Thailand. This was then applied to model PM10 data in Chiang Mai city for 10-days during a high haze event using an updated WRF version (v. 3.7) and updated land use categories from the Moderate Resolution Imaging Spectroradiometer (MODIS). A higher resolution...
The formation of polymeric materials can be achieved by several methods such as melting and casting, screw extrusion, cross-linking of resin or rubber in a mold, and so on. In this work, the polyacrylic acid is formed by using the emulsion disturbance method. Despite extensively used in the colour painting and coating industries, acrylic emulsion can be processed into a foam and powder...
In this work, CaCu$_3$Ti$_4$$_-$$_x$(Nb$_1$$_/$$_2$In$_1$$_/$$_2$)$_x$O$_1$$_2$ ceramics with x = 0, 0.025, 0.05, 0.10, and 0.20 were prepared by a conventional solid state reaction method. Changes in crystal structure, microstructure, dielectric, and electrical properties were systematically investigated. The main phase of CaCu$_3$Ti$_4$O$_1$$_2$ ceramic was clearly observed in all the...
In this study, comparison of spectral ultraviolet irradiance at 305, 310, 324 and 380 nm at satellite overpass time retrieved from OMI/AURA satellite with that from ground-based measurement was performed at Nakhon Pathom (13.82 N, 100.04 E), Thailand. The analyzed data period comprises from 1 January 2010 to 31 December 2015. The comparison results clearly show the overestimation of satellite...
We use holographic techniques to compute inflationary non-Gaussianities for general single-field inflation, including models with a non-trivial sound speed. In this holographic approach, the inflationary dynamics is captured by a relevant deformation of the dual conformal field theory (CFT) in the UV, while the inflationary correlators are computed by conformal perturbation theory. In this...
Copper phosphate (Cu$_2$P$_2$O$_7$) nanostructures were synthesized by hydrothermal method. The precursor products were calcined at 500, 600 and 700 oC in air for 3 h. Thermogravimetric/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) were used to study the phase formation, crystalline...
Clouds play very important role in the variation of surface solar radiation and rain formation. To understand this role, it is necessary to know the physical and geometrical of properties of cloud. However, clouds vary with location and time, which lead to a difficulty to obtain their properties. In this work, a ceilometer was installed at a station of the Royal Rainmaking and Agricultural...
To measure the properties of top quark, it is crucial to identify events containing top quark pair first by using discriminators. Currently cut-based discriminators are used to identify such events. This, however, may lead to inaccuracy due to the fact that cut-based discriminators might exclude collision events including top quark pair, or, even worse, include background events in which top...
Bismuth vanadate (BiVO$_4$) microstructures were successfully synthesized by a hydrothermal method at 200 °c for 24 h. The phases and morphologies of the products were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and photoluminescence (PL) spectroscopy....
In the near future, experimental studies of charmed baryon productions will be carried out at $\bar{\text{P}}\text{ANDA}$ and J-PARC. In the $\bar{\text{P}}\text{ANDA}$ experiment, charmed baryon productions will be studied in proton-antiproton annihilation reactions. At J-PARC, the spectroscopy study of charmed baryons via the pion induced reactions at a high-momentum beam line will be...
Fokker-Planck equations are partial differential equations that describe stochastic processes. Two applications will be discussed: liquid crystal physics and quantum optics. Liquid crystals can show different aggregate phases that can be used in commercial applications. These phases are self-organized equilibrium states and are characterized by order parameters such as the Maier-Saupe order...
The dynamics of pinned spiral waves, whose tips trace the boundary of obstacles, are of interest due to the impact on human health. In heart, such pinned waves cause longer lifetime tachycardia. In this article, we present two methods for generating pinned spiral waves in a simulated excitable system. In method A, an obstacle is set in the system prior to an ignition of a spiral wave. This...
The Synchrotron-based X-Ray Absorption Near-edge Spectroscopy (XANES) and Polarized Neutron Reflectivity (PNR) techniques were employed to investigate the structural properties of BiFe$_{1-x}$Mn$_{x}$O$_{3}$ ceramic and Co/CoO/Au multilayer, especially to study the local structure of Mn in BiFe$_{1-x}$Mn$_{x}$O$_{3}$ ceramic and to verify the formation of secondary phase in Co/CoO/Au...
There are some limitations of discrete-time Markov processes modeled as approximations to continuous-time Markov processes. In discrete-time simulation models, time is discretised into uniform steps and transitions between states are discribed by transition probabilities whereas, in continuous-time Markov processes, state changes are driven by transition rates. In our research, we focus on...
We investigate theoretically the transmission properties of a single atom passing through simple Tesla valve structures operated in a quantum mechanical regime. Our simple structure were made up of a few static equiangular triangles that allow a high and low transmission efficiency in one direction and not the other. Our best value of the extinction ratio, the ratio between forward and...
We take an assumption about the time variable in physics that actually the continuous time flow constitutes from in finite tiny discrete time steps resulting in different behavior of the system between these two time scales. To proof the assumption, the two coupled harmonic oscillators is studied as a toy model both in classical and quantum realms. In classical level, the discrete equation of...
In this paper, magnetic force microscopy (MFM) probes with different coating materials were characterized under AC magnetic field. A perpendicular magnetic write head similar to those used in hard disk drives was employed as the AC magnetic field generator. In order to measure a response of MFM probes to AC magnetic field, a MFM probe under test was scanned, at a scan height of 10 nm, across...
Metal-organic complexes, such as metal-porphyrins, can function as homogeneous catalysts for electrochemical reduction. In this work we present ab initio electronic structure calculations for a reaction involving carbon dioxide and salcomine, a coordination complex consisting of a salen ligand and a cobalt (II) atom. Changes to the binding energy due to substitutions on the phenyl ring by...
The fabrication of uniform island nanostructures on heteroepitaxial thin films is a crucial step toward improving the efficiency of optoelectronic and solar cell devices. In this work, we investigate a strained heteroepitaxial thin film system in two dimensions using the kinetic Monte Carlo simulation method. The strain arising from the lattice mismatch is incorporated into the system using an...
Magnetic force microscopy (MFM) was employed to characterize the magnetic field distribution of two different designs of perpendicular magnetic writers with fully wrap-around shield (WAS). Typical magnetic write heads, located on a slider at the so-called air bearing surface (ABS), are composed of a magnetic write pole and a magnetic return pole. The write pole has a much small cross section...
The elastic properties of copper-silver alloy were determined for different atomic compositions by molecular dynamics simulations using an embedded atom model (EAM) potential. The elastic constants (c$_{11}$, c$_{12}$, c$_{44}$) that describe the Young’s modulus, bulk modulus, and shear modulus, were obtained from the stress-strain curves using strains applied at a constant rate. The...
Linear-time invariant (LTI) oscillation systems such as mechanical vibration,
series RLC and parallel RLC circuits under external driving force can be solved by using simplest initial conditions or
employing of Green's function of which knowledge of initial condition
of the driving force term is needed. Here we show a mathematical connection of the LTI system and the Helmholtz...
In this work, Zn$_1$$_-$$_x$Fe$_x$O (x=0.000, 0.0625 and 0.125) materials have been investigated in both experimental and theoretical aspects. The pure and Fe-doped ZnO nanoparticles were prepared by a combustion method. The crystal structures were characterized using the X-ray diffraction (XRD), morphology by the transmission electron microscopy (TEM) techniques, magnetic behavior by...
The double-stranded DNA (dsDNA) that is separated and unwound changes its structure to the single-stranded DNA (ssDNA) in response either to the thermal energy or to the external forces. For the former the thermally induced dsDNA-to-ssDNA transition, called DNA denaturation, occurs in the polymer chain reactions. For the latter the force induced dsDNA-to-ssDNA transition, called DNA unzipping,...
We find greater genetic diversity in a Penna model when the mutation threshold is less than the reproductive age, for the case of individuals reproducing only once in their lifetime. This greater diversity is obtained at the cost of decreased saturation population. An increased mean lifespan was obtained for the population with greater genetic diversity. We interpret this longer lifespan as a...
The purpose of this work is to study and develop a forward modelling computer program of 2D seismic wave by using finite-difference method. Forward modeling is a method that shows how seismic wave propagates through particular subsurface area, and also one of the schemes in Inversion method which is used for modeling the prospect area from the acquired seismic field data. Despite the fact that...
The qualitative and quantitative study of gunshot residue (GSR) obtained from M16 and AK47 rifles are reported. The GSR samples were collected from various different sources of the shooter (hand, cloth, and helmet), elapsed time, and number of shooting. The scanning electron microscope with electron dispersive X-ray spectrometry (SEM/EDS) showed that the various shapes and sizes of the GSR...
A novel polymer composite material with high stiffness and thermal endurance can be designed by optimizing the filler content. We investigated the microscopic properties of the interfacial regions between cis-polyisoprene (natural rubber) and carbon-based fillers, e.g. fullerenes by using classical molecular dynamics (MD) simulations. The microscopic analysis shows that increasing filler...
In this work, we discussed about our construction of a portable flat vacuum cell and our study of the effect of surface adsorption in the cell in which thermal atoms were trapped. The cell comprised two parallel glass plates that were separated by a narrow gap in order to accentuate the dominance of collisional frequency along the glass surface’s normal. The identification and measurement...
This study aims to investigate the elemental compositions in 50 Thai rice samples using instrumental neutron activation analysis (INAA) and to identify rice according to their types and rice cultivars using statistical analysis. As, Mg, Cl, Al, Br, Mn, K, Rb and Zn in Thai jasmine rice and Sung Yod rice samples were successfully determined by INAA. The accuracy and precision of the INAA method...
Standard cosmological model containing barotropic fluid in arbitrary spatial curvature and scalar field under arbitrary potential can be described in the form of non-linear Schr\"{o}dinger (NLS) formulation. The formulation leads to the simpler way in obtaining exact scalar field solutions. NLS may be useful for interpretation of wave function in quantum cosmology.
A two-qubit system is studied in the quantum operator formalism to analyze the open system consisting of two atoms in a cavity. The evolution of an open system is usually described in the Kraus representation which is constructed by considering a large closed system. In this work, we consider the short time scale of the evolution of systems in terms of interaction Hamiltonian. We focus on the...
In this research, engine emissions from different vehicle age, type and used fuel in Amphoe Muang Lampang in Thailand were measured and studied with a portable gas combustion analyzer. Concentrations of carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), nitrogen oxides (NOx) and sulfur dioxide (SO2), as well as exhaust gas temperature (flue temperature, FT), net calorific efficiency...
In this work we will present the analysis results of the explorer-0 chips which have been irradiated by 5.9 keV X-ray from $^{55}$Fe sources. The explorer-0 chip is a prototype CMOS imaging sensor designed for new Inner Tracking System of ALICE detector. Here we focus on four important parameters, the pixel pitch, the collection electrode size, the distance between the electrode and the...
V2790 Ori is a W Uma Eclipsing Binary with an orbital period of 0.28784200 day. From the previous investigation of its light curve, it was found that this binary system has a continuous orbital period change. A light curve of V2790 Ori was analyzed using program Maxlm DL4 and its period change was also calculated. The result revealed that the orbital period of V2790 Ori was continuously...
As an excellent source of nutrients, riceberry has gained more intention than white rice. However, information of instant rice obtained from riceberry is scarce. An alternative technique of instant rice preparation was therefore proposed in this work. The combined gas-fired infrared burner and air convection drying at different gas-fired infrared burner intensities was investigated. Gas...
The upper Chao Phaya Basin is the largest Cenozoic sedimentary basin that is located in the upper central part of Thailand. The basin is a high potential area for agricultural activities, such as growing rice, sugarcane and vegetables. In each year, the groundwater level has decreased continuously about 10-30 cm/year. Groundwater levels dropped from 5-10 m. to 10-25 m below ground surface at...
Atmospheric water vapor is a crucial component of the Earth's atmosphere, which is shown by precipitable water vapor. It is calculated from the upper air data. In Thailand, the data were collected from four measuring stations located in Chiang Mai, Ubon Ratchathani, Bangkok, and Songkhla during the years 1998-2013. The precipitable water vapor obtained from this investigation were used to...
Jupiter’s polar emission, whose brightness behavior appears to be unstable. This work focuses on the bright spot in active region which is a section of Jupiter’s polar emission. Images of the aurora were taken by Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). Previously, two bright spots, which were found on May 13th 2007, were suggested to be fix on location...
A thermionic RF-gun is an essential component in electron injector for producing a quality electron beam for a THz radiation source at Plasma and Beam Physics Research Facility, Chiang Mai University. The RF gun consists of one and a half normal conducting resonant cavities and a side-coupling cavity which operates in pi/2-mode at frequency of 2856 MHz. In 2014, the gun design was improved by...
In the wood production manufacturing process, there are a lot of wood scraps must be left to waste. To product a pole from the wood scrap, which help to reduce cost in the production, is to use the wood scrap more efficiently. In this work, the wood poles were be designed, constructed and tested from teak and Para wood scrap by using finger joint with Polyvinyl Acetate. To constitute of these...
This research study Calcium oxide synthesis from cockle shells for catalyst in biodiesel production from palm oil. The shells are calcium is transformed into calcium oxide. This is a powerful catalyst for the transesterrifcation reaction. The research was burned cockle shells at 900 °C for 5 hours. The ratio of methanol : oil is 9 : 1 molar. The temperature reaction at 80 °C for 30 minutes....
Cesium iodide doped with Thallium (CsI:Tl) is one of the most materials used for radiation detector applications. In this work, the CsI:Tl crystals that made from the material sources with different precursor purity were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Raman scattering, UV-Vis spectroscopy and...
Soil is heterogeneous medium which consist of liquid, solid and gaseous phases. Natural soils of various types have different electrical properties due to the composition, structure, water content, pH and temperature. This research aims to study the correlation of electrical resistivity for predicting pH of lateritic soil. The samples of soil were collected from farm of Kasetsart University...
This research studies on the nature of aurora feature on Jupiter, especially the aurora that connects to its satellite, Io. Jupiter has a large magnetosphere, as a result of strong magnetic field strength. This magnetosphere corotates with Jupiter and extends over all of Galilean satellites. The interaction between Jupiter’s rotating magnetic field and Io cause plasma particles to flow along...
CuFeO$_2$ is a metal oxide mineral material which is called delafossite. It can potentially be used as a chemical catalyst, and gas sensing material. There are methods to fabricate CuFeO$_2$ such as chemical synthesis, sintering, sputtering, and chemical vapor deposition. In our work, CuFeO$_2$ is prepared by Fused Deposition Modeling (FDM) 3D printer. The composite filament which composed of...
Bangkok is located on the soft marine clay of the Lower Chaopraya Basin which can amplify seismic wave and affect to building shaking. Shallow shear wave velocity to depth 30 m. (V$_s$30) is widely studied recently but data of deeper layer to bedrock still absent. The missing data are useful for earthquake engineering design and ground shaking estimation.
This study aims to measure deep shear...
The general high temperature furnaces are usually used in the atmosphere, a sample it consequently contacts the air that has pollutants, there makes the sample impure by exposure in a particular way to be not required and difficult to control gas that requires to an interaction within a sample. A heating technique in a vacuum environment is required to fix the referred problems. The purpose of...
This work was aimed to design and construction of portable survey meter for radiation dose measuring. The designed system consists of 6 parts including GM-tube radiation detector, low voltage power supply, high voltage power supply, pulse conditioning, processing and display on android phone. The test results indicated that the ripple voltage of low and high voltage power supply were less...
Transverse emittance of a charged particle beam is one of the most important properties that reveals the quality of the beam. It is related to intensity, size and angular displacement of charged particles in transverse phase space. There are several techniques to measure the transverse emittance value. One of a practical method is the pepper-pot technique. This research concentrates on...
The $\omega-\phi$ mixing plays an important role in particle interactions involving vector mesons. The SU(3) flavor symmetry predicts the flavor mixing in vector meson nonet. The $\omega-\phi$ mixing angle was predicted by several physical processes, such as decay rate, radiative decay of $\omega$ and $\phi$. In this work, we calculated vector meson masses by using chiral Lagrangian at leading...
In present day, rainfall estimation by weather radar is widely used. Meteorologists use various z-r relationships to appropriate rainfall estimation for different study areas which have different factors such as topography, climate, rain pattern, types of clouds, etc. This research aims to determine the appropriate altitude of radar reflectivity (Z-Level) to provide accurate rainfall...
This research aims to investigate the relationship between atmospheric carbon dioxide (CO2) concentrations, traffic count, vehicle type and meteorology at three study sites in Amphoe Muang Lampang in Thailand. Initial measurements were conducted since December 2016 from 2:00-4:00 PM. Since CO2 concentrations also depend on biospheric processes (photosynthesis and respiration), the chosen...
This research focuses on design and development of beam diagnostic system of an electron linear accelerator (linac) for natural rubber vulcanization at the Plasma and Beam Physics Research Facility, Chiang Mai University. The main components of the accelerator include a DC thermionic electron gun and an S-band standing-wave linac. The system will be used to produce electron beams with...
Eclipsing binaries with pulsating components are very crucial objects for asteroseismology. We present the results of an analysis of photometric time series observations for the intermediate-age open cluster NGC 2126 acquired during the years 2004, 2013 and 2015 with the aim to detect new variable stars and to study binary systems. The CCD photometric light curves in V band of the eclipsing...
The mechanical properties of cementitious materials, widely applied in construction, could be improvedby reinforcement with cellulosic natural fibres. In this study, another type of natural fibers, i.e. the bacterial cellulose (BC) obtained from coconut jelly (nata de coco) was added to cement paste to form the reinforced composites. The coconut jelly was thoroughly washed and blended prior to...
Geopolymer is an environmental friendly construction material which has a potential for replacing cement. In the present study, the addition of carbon fiber and nano-silica in geopolymer paste was studied in terms of the electrical and mechanical properties, and the microstructure. The geopolymer paste was made from fly ash by blending it in Na$_2$SiO$_2$/NaOH solution using the liquid/ash...
Recycled borosilicate glass (RBSG) was used a composition in 80RBSG–20Na2O glass systems doped with different transition metal oxides (TMOs) (where TMOs = V2O5, Cr2O3, CuO, ZnO, ZrO2, Ag2O and CdO). The ultrasonic velocities (both longitudinal and shear) of glass systems were measured by using pulse echo technique. Measurements were carried out at 4 MHz frequency at room temperature. The...
In this work, the stock price variation in a form of dynamic hysteresis was investigated via Monte Carlo simulation. The Ising spin Hamiltonian was considered as the level of ‘disagreement’ (in the social economic) which has to be minimized for the market sustainability. The Ising spin directions (either +1 and -1) were considered to refer to an agent’s intention to perform his action on...
Lightweight aggregates were prepared from fly ash of by-products from the paper industry. The influence of the ratio of clay to fly ash and processing conditions on lightweight aggregates properties were investigated. It was found that the amount of fly ash directly affected to porosity of lightweight aggregates. Lightweight aggregates with the ratio of clay to fly ash at 80:20 wt% using the...
We study the Josephson effect in a gapped graphene-based superconductor/barrier/superconductor junction as using the Dirac-Bogoliubov de Gennes (DBdG) equation for theoretical prediction. A massive gap of this regime is induced by fabricating a monolayer graphene on substrate-induced bandgap and superconductivity is acquired by the proximity effect of conventional superconductor (s-wave...
We proposed a method to calculate the effective capacitance of a metallic single-electron transistor using the quantum Monte Carlo method to describe the Coulomb blockade effect. The effective capacitance depended on the induced gate charge, temperature, and conductance of the system. Furthermore, the results can be used to calculate the effective charging energy, which can characterize the...
This research studied about electricity cogenerator from Hydrogen and Biogas and the factors that cause that effecting Hydrogen from Aluminum which was a cylindrical features. By using a catalyst was NaOH and CaO, it was reacted in distilled water with percentage of Aluminum : the catalyst ( NaOH and CaO ) : the distilled water, which were 2 : 8 : 1, respectivety. And the percentage of...
The Nelson-Seiberg arguments of the connection between supersymmetry breaking and R-symmetry breaking is determined for gauged and localized supersymmetry theories with generic superpotential. This is a study of symmetry breaking in supergravity theory. The metastable vacua of supergravity from the contribution of F and D auxiliary fields in superpotential are determined, and also anti-de...
Excitonic solar cells (XSC) based on heterojunction nanostructure composed of low-dimensional materials have gained a great deal of interest due to its large interface area and hence the high possibility in generating excitons. In general, the power conversion efficiency (PCE) of this XSC depends strongly on the interface band alignment between donor and acceptor materials. Therefore,...
Transparent conducting oxides (TCOs) are widely used for many applications. Typically, most of TCOs are intrinsically n-type semiconductors and are difficult to be doped for p-type conductivity. The spinel ZnRh$_2$O$_4$ has been recognized as a potential p-type TCO. In this work, we present energetics and electronic properties of native defects including vacancy, interstitial and antisite...
Neutron monitors (NMs) are ground-based detector designed to measure the cosmic ray (CR) intensity, sometimes observe a sudden reduction in galactic CR intensity, the so-called Forbush decreases (FDs) event. The Princess Sirindhorn NM (PSNM) was established in 2007, an NM64-type and 3 bare tubes located at the world's highes geomagnetic vertical cutoff rigidity 16.8 GV was installed at Doi...
The gamma-ray attenuation coefficients of strontium–lead–silicate glasses have been measured by using a narrow beam transmission technique for gamma ray photon energies at 122, 662, 1173 keV and X-ray attenuation technique for gamma ray photon energies at 74.228 keV. These coefficients were then used to obtain the values of mass attenuation coefficients and half value layer. In order to...
We investigate coherent single photon in the infrared regime traveling in the positive z direction passing through a single layer of strained graphene. The angle of rotation relates to space deformation by the terms of directional dependent fermi velocity. Analytical expressions of full quantum mechanics, by second-quantization approach, are obtained for components of the magneto-optical...
Sb-single doped rutile-TiO$_2$ (STO) ceramics were prepared by a conventional mixed oxide method. The high-dielectric performance with giant dielectric constant value ($\epsilon$'$\approx$10$^4$) with low dielectric loss (tan$\delta$<0.05) of STO ceramics over a wide temperature range were obtained. Scanning electron microscope coupled with energy-dispersive X-ray analysis (EDX) and X-ray...
The hadronic products that result from proton-proton collisions at the Large Hadron Collider (LHC) can give rise to jet formation that can be detected be the Compact Muon Solenoid (CMS) detector. Several interesting physics, both Standard Model (SM) and Beyond Standard Model (BSM), processes can result the final states with charm quark jets. Analyzes rely on the algorithms that try to identify...
The reductive perturbation technique is applied to obtain the dust acoustic wave equation from the governing equations for dust grains in plasma. Some electrons and ions can be trapped in the charged dust potential and the populations of these two particles will be described by the Maxewellian distribution. The growth rate can be determined by applying a long-wavelength perturbation to the...
We report the differences in light stable isotopes between two kinds of Thai rice (Thai jasmine and Sung Yod rice). Thai jasmine rice and Sung Yod rice cultivated in the northeast and the south of Thailand. Light isotopes including 13C, 15N and 18O of Thai jasmine rice and Sung Yod rice samples were carried out using isotope ratio mass spectrometry (IRMS). Thai jasmine rice (Khao Dawk Mali...
Graphene oxide (GO) is graphene sheet laced with oxygen-containing functional groups that located at edge of the lattice. The properties of GO can be modified depending on the degree of reduction of oxygen-containing functional groups. Typical methods to reduce GO include wet chemical processes and thermal annealing in which hazardous chemical substances and high temperature are applied. In...
We present a portable device for long-time recording of the temperature at multiple measuring points. Thermocouple wires are utilized as the sensors attached to the objects. To minimize the production cost, the measured voltage signals are amplified and sequentially relayed via a multiplexer to a single microcontroller. The observed temperature and the corresponding date and time, obtained...
In this work, magnetic force microscopy (MFM) was utilized to observe the magnetic write head remanence, which is the remaining out-of-plane magnetic field on magnetic write heads after a write current is turned off. This remnant field can write unwanted tracks or erase written tracks on a magnetic media. The write head remanence can also occur from device and slider fabrication, either by...
One of significant problems limiting the performance of perpendicular magnetic write heads is wide adjacent track erasure (WATEr), causing stored data near and also far from a written track being erased. Understanding WATEr mechanisms and its locations is crucial both for design and process engineers. Typically, the presence of WATEr in magnetic write heads is monitored using a spin-stand...
This research studies the material’s properties which aim to analyze and evaluate the appropriateness of selection the material for repairing propeller shafts of fishing boats. The materials’ preferential ranking is used as the method of study, which uses the criterion of materials’ properties, including mechanical properties and chemical properties, as an assessment tool. The result of...
Electrical double probe measurement is one of the techniques used to find plasma parameters. Plasma parameters which electrical double probe can determine are electron temperature and electron density. Plasma parameters can be extracted from I-V characteristic graph of double probe which is inserted inside plasma. A program which is responsible for all calculations and control are written in...
Fabrication of perpendicular magnetic recording heads in hard disk drives involves many processing steps and control parameters. One of the control monitors is side wall angles of the write pole tip which is typically measured by a scanning electron microscope (SEM). SEM observation is, however, a destructive testing as magnetic recording heads were damaged by electron bombarding. This paper...
Cement is a very important material for building and construction but the main drawback is its brittleness due to high porosity. The brittleness of cement was found to be improved by reinforcing the cement matrix with celluloses extracted from plants. In present work, we studied another type of natural cellulose produced by bacteria, i.e. bacterial nano-cellulose (BNC). The BNC was obtained...
In this work, the disease spreading under the framework of SIS (susceptible-infected-susceptible) compartment model was investigated using the magnetic Ising model, the stochastic Monte Carlo simulation, and the knowledge based Neural Network analysis. The defined systems were lattice-like and varied in sizes to observe the finite size effect, where the agents (either susceptible or infected)...
The study on measurement of moisture content in paddy rice by capacitance method, using the principle of physics is capacitance that relate with dielectric of water. The study use IC555 frequency circuit for measure moisture content. We put the paddy rice in parallel plates that replace a capacitance in circuit. The frequency will change follow by capacitance of paddy rice, by the way if the...
Monte Carlo (MC) samples are the essential components for almost all particle physics related experimental analyses. These samples are widely used for the 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...
Galactic cosmic radiation emanates from outside the solar system, while occasionally a disturbance in the sun’s atmosphere leads to a surge in radiation particles.
Protection is provided by the sun’s magnetic field, the earth’s magnetic field, and the earth’s atmosphere. Dose rates are dependent on the altitude, the geomagnetic latitude and the solar cycle. For occupational exposure to...
This research studies the characteristics of local earthquakes occurring in the northern Thailand during the year 2006 to 2015. 780 seismic events (ML ≥ 0.1) are recorded and analyzed from densed seismic networks in Thailand. Seisan earthquake analysis software was used to calculate the magnitudes and to relocate the earthquake locations with the seismic velocity model of Thailand (TRF,...
We present and analyze phase portraits of dynamical scalar field of Non-Minimal Derivative Coupling Gravity model in Palatini formalism.
This study did observation of Geostationary Equatorial Orbit (GEO) satellite above Thailand’s sky by 0.7-meter telescope at Inthanon Mountain, Chiangmai, Thailand. The observation took place 14 nights with Sidereal Stare Mode (SSM) in which the moving object will show during the streak detection. The star identification for image calibration is based on a star catalogue. The streak detection...
A new type of canonical transformations for the multiplicative Hamiltonian, which considered as a 1-parameter: $\lambda$-extended class from the standard additive form of the Hamiltonian, was found and called $\lambda$-extended class of the standard canonical transformations. The $\lambda$-extended canonical transformations could be treated as a generating function to produce an infinite...
The study of orbital element of Asteroids (in Cometary Orbits, ACO) is based on images taken by 0.7 m diameter telescopes to find position of asteroids and calculate their orbital elements. This work focuses on variation of position and orbit shape of ACO, which are obtained by analyzing orbital element and Minimum Orbital Intersection Distance (MOID). Each observation, those parameters are...
The temperature control system was designed and built for application in dielectric spectroscopy. It is based on dual-stage Peltier element that decreases electrical power and no cryogenic fluids are required. A proportional integral derivative controller was used to keep the temperature stability of the system. Temperature of the system was measure by a Pt100 temperature sensor. Effect of...
Nanocomposite piezoelectric films based on the blend of poly(vinylidenefluoride-hexafluoropropylene) (PVDF-HFP) and magnesium chloride hexahydrate (MgCl$_2$•6H$_2$O) have been investigated in this work. The films incorporated with 0.5 wt% MgCl$_2$•6H$_2$O were prepared using a solution casting technique and uniaxially stretched at various ratios from 2 to 6 times in order to characterize phase...
This report studied the necessary condition to obtain different phase of synthesized CaCO$_3$ and their corresponding electrical properties. The precipitation with varied reaction temperature was performed, and the structure of product was determined by using x-ray diffraction and scanning electron microscope. The micrograph of derived CaCO$_3$ was observed as rice-grain structure as reaction...
Recurrent novae (RNe) are novae with multiple recorded outbursts powered by a thermonuclear runaway. This occurs on the surface of the white dwarf in a close binary system in which a late type main-sequence or giant secondary star is filling its Roche lobe and transferring material onto the white dwarf primary star. They resemble classical novae (CNe) outbursts in several aspects and by...
In this study, Potential increasing of rubber sheet production with fungus displacement by solar tunnel dryer. By integrating a biomass gasifier as an assisting heat source for drying Rubber Sheet produce and its performance analysis has been investigated. Experimental study has been carried out with the stand-alone solar tunnel dryer and the dryer with the assisted biomass gasifier.
For...
We study the preheating process in the universe after inflation for the inflationary model in which the coupling between the inflaton and the matter scalar field is a result of disformal transformation. We find that the disformal coupling between inflaton and matter scalar field can lead to efficient preheating process.
Platinum (Pt) counter electrode was coated by electrochemical method as high surface area and abiding adhere to substrate. Electrochemical system consist the dc power supply control, heating to electrolyte solution and substrate holder can adjust distance of electrode. Electrolyte solution was synthesized by platinum (IV) choloride (PtCl$_4$) powder (purity, 99.9 %) dissolved in hydrochloric...
Principle chiral models and their deformations are interesting systems with QCD-like behaviour. Furthermore, their integrable structure makes them potentially tractable. I discuss quantum mechanical theories arising in various limits of the models, with a view to analysing the non-perturbative dynamics.
The bamboo is highest growth rate plant in the world. Bamboo can grow 10 cm. in the days. Moreover it is environmental friendly and easy to regrow. Research studies founded spicy with high energy, drought resistance, can withstand flooding and suitable for growing in Thailand is ‘Dendrocalamus Asper Backer Bamboo’
The purposes of this study were found the best ratio of fuel briquettes from...
Today, dried shrimp in the market were refused food coloring and drying until shrimp are colorful and tasty. Meanwhile, Community groups, women's health trying to produce food products come from herbs. As an alternative to consumers. The production process is also a traditional way to dry. In order to extend the shelf life longer. Sometimes, potential risks, both in quality and quantity of...
Abstract
This research is studying dried banana. Using solar drying greenhouse. To compare the rate of drying Weight loss, Humidity and wet. Materials used in the experiments is Cultivated Banana. Banana Full ball and banana cut in half. The experiment compared to dry naturally with using 3-Shelves Solar Oven for a period of 3 days from the time. 09:00 to 16:00 hrs. Which records the...
Mismatch effect of renormalized Fermi velocity of massive Dirac fermions on the spin transport properties and tunneling magnetoresistance in a gapped graphene-based ferromagnetic/velocity barrier/ferromagnetic (FG/VB/FG) junction is investigated. The electrostatic potential created by the applied voltage on the VB region can generate spin-dependent collimation of Dirac fermions. The quantum...
Radio astronomical observations have increasingly been threaten by the march of today telecommunication and wireless technology. Performance of radio telescopes lies within the fact that astronomical sources are extremely weak, e.g more than 15 orders of magnitude weaker than most mobile phones. The National Astronomy Research Institute of Thailand (NARIT) has initiated a 5-year project, known...
Abstract
Thailand was under the influence two types of monsoon winds, Northeast monsoon and Southwest monsoon. The Northeast monsoon (October – February) brings the cold and dry air from China to cover the major parts of Thailand. The Southwest monsoon (May – October) brings a stream of warm moist air from Indian Ocean towards Thailand causing abundant rain over the country. The objective...
Delamination is a mode of failure for composite different materials and can cause layer to separate between silicon die and die attach material. Because there is a mismatch in the thermal of materials, lead to cracking and damaging on integrated circuit (IC) packages. In this study, we attempted to reduce the delamination of mini small outline package (MSOP) in die attach process. The...
The purpose of this research aims to reduce of setup time in wafer sorting before integrated circuit packaging. To add hardware respectability detection process without prober setup before correlation wafer check process with modification of test program and making up a tool kid. Then, the experimental data was correlated with the respect range. Finally, this setting up was limited that it...
Biogas produced from the fermentation in the province of Maha Sarakham of excreta from cow dung, fattening pigs and buffalo dung in small scale farms contained hydrogen sulfide (H2S) at 764, 926 and 1,103 ppm, respectively. This gas has offensive smell and is corrosive to motor and metal stove of farmers, thus needs to be eliminated. The adsorbent granules soaking in FeCl3 and NaOH made from...
Riceberry is a highly nutritious rice variety with dark purple grain. Previous studies have shown that the darker shade of grain color has a higher nutrient content. In this work, we study the color distribution of the Riceberry rice grains in order to provide a quantitative quality indicator. Here, pictures of the grains were taken using a digital CCD camera. To make the data more...
The blue color of the blue sapphire is caused by the Fe-Ti pairs. Recently, the oxidation states of Fe and Ti on high-quality blue sapphire were found as Fe$^{3+}$ and Ti$^{4+}$. However, the oxidation state of Fe on natural sapphire with some inclusions was reported as mixing of Fe$^{2+}$ and Fe$^{3+}$ using the x-ray absorption near edge structure spectroscopy (XANES). Generally, there are...
We have focused on dark matter annihilation into electron-positron pairs, neglecting other processes, such as dark matter decay, or other annihilation products. Instead of focusing on a specific dark matter annihilation model, we have adopted a model-independent approach, in which all particles are created with the same initial energy, of the order of the mass of the dark matter particle. The...
The Schiff base was synthesized by 2,5-thiophenedicarboxaldehyde and 1,2,4-thiadiazole-3,5-diamine with condensation method. There was modified on Carbon paste electrode (CPE) and Printed circuit board (PCB) gold electrode for determination silver ion. The Schiff base film of modified electrodes was characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM),...
We investigate the behavior of Dirac Particle (electron and hole) confined on the surface of graphene wormhole, specifically, curvature induced by the geometry of graphene wormhole.
For calculation, we use numerical shooting method of finding eigenvalue of the Dirac equation in a curved space of graphene wormhole.
Our numerical results demonstrate that energy of band structures of the...
A system for measuring Seebeck coefficient has been designed and constructed which can be measures at room temperature. The system consists of three main parts, a temperature controlling, a data acquisition and a programming. The temperature controlling include of a PID temperature controller which fabricated by using an Arduino microcontroller boards. The data acquisition consists of two...
Electron beam irradiation can modify or improve chemical and physical properties of polymer and natural rubber. It is one of interesting and effective industrial applications of electron accelerators. This paper describes about the design of electron beam irradiation apparatus to find the efficient and convenient system for the natural rubber vulcanization. In addition, electron beam...
This research is a simulated and experimental study on effects of bipolar electrodes of a PEM fuel cell on its power conversion efficiency. The PEM fuel cell structure consists of bipolar electrodes, proton exchange membrane with catalysts, flow channels of gases. This research used fuel cell of 49 $cm^2$ in active area as a research sample and the Comsol 4.4 was employed to simulate flow...
In this study, the effect of urban structures (e.g. buildings, trees, bridges, etc.) on surface wind speed and wind direction was investigated using a Navier-Stokes equation solver to simulate wind over complex topography. The simulations were performed over the Lampang-Ngao highway and surrounding areas in Amphoe Muang Lampang in Thailand. This area is characterized by vehicular traffic...
Solar flare is the huge explosion on the Sun’s surface and releases the solar energetic particles (SEPs) to interplanetary medium.The objective of this work is studying the propagation of SEPs from the Sun to the Earth. We simulate the particle propagation for the solar event on August 9, 2011 with the transport equation of Ruffolo 1998. We solve the transport equation by the numerical...
Gemstone commercial is a high revenue for Thailand especially ruby and sapphire. Moreover, Phrae is a potential gem field located at the northern part of Thailand. The studies of spectroscopic properties are mainly to identify gemstone using advanced techniques (e.g. UV-Vis-NIR spectroscopy, FTIR spectroscopy and Raman spectroscopy). Typically, UV-Vis-NIR spectroscopy is a technique to study...
We use the Moiré fringe patterns to measure the stress and strain values of rubber in tension, and analyze the stress-strain relationship. With the printed straight-line pattern on a standard dog-bone specimen, the Moiré patterns can be constructed when the rubber specimen is stretched. The geometrical relationship of bright and dark fringes is used to calculate the strain values both in the...
The structural and optical properties of the mercury chalcogenide HgSxSe1-x and HgSxTe1-x nanocrystals with zinc-blende structure are analyzed using the sp3s* empirical tight-binding method. We calculate the single-particle spectra, band gaps, charge densities, density of state (DOS), electron-hole interaction and optical properties as a function of diameters and alloying concentrations (x)....
The Metal Organic Vapor Phase Epitaxy is single crystal growth process, forming GaAsN films on GaAs (001) substrates, built up by chemical method using trimethylgallium (TMGa), dimethylhydrazine (DMHy) and tertiarybutylarsine (TBAs) as Ga, N and As, respectively. Commonly, the process is contained hydrogen (H$_2$) gas, a carrier gas, to convey precursor to the reaction chamber. Alternatively,...
Cobalt ferrite nanoparticle (NP) is a class of ferrite which has a potential for many applications but the agglomeration of magnetic NPs limits its full potential usage. In this research, cobalt ferrite NPs were synthesized in the presence of bacterial cellulose (BC) nanofibers which acted as the scaffolding templates. The BC was obtained from a commercially available nata de coo (coconut...
Micrometre-scale graphene sensors can detect individual molecule adsorptions or desorptions [1]. This is due to its low-noise electronic characteristics. However, molecules in gas phase rarely adsorb on non-defect graphene surfaces. By doping graphene with nitrogen, the atomic structure and electronic properties of graphene were modified. Here, we measured the sensitivity of graphene and...
We study a subclass of GLPV modified gravity theories generated by a general disformal metric $\bar g_{\mu\nu} = g_{\mu\nu} + D(\phi,\partial \phi) \partial_\mu\phi \partial_\nu \phi$. By solving the background evolution equation, we found that such theory cannot provide the self-accelerating solution.
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 5 C and left at around room temperature for aging...
Cosmic-ray muons are produced in the atmosphere as results of the collision of incoming high-energy particles, i.e. cosmic rays, from outer space with atmospheric particles. In this work, a simple detector has been built to measure the speed of cosmic-ray muons. The detector is composed of two scintillation bars of a rectangular cross-sectional area of 4×6 cm$^2$ and a length of 127.5 cm, with...
The kaon production in heavy ion collisions at intermediate energies provides a sensitive probe to study the in-medium properties and nuclear equation of state. Kaon properties in dense hadronic matter are important for understanding of nuclear matter at high densities. We investigated the in-medium kaon potential by rapidity density distribution and transverse mass spectra for ${K^ +...
RX Hydrae is a bright Algol-type eclipsing binary system with orbital period is 2.2825 days. This system was classified as the member group of oEA stars in 2002. The short-periodic pulsations of a primary component were detected by Kim et.at (2002) who classified the system as a new member of oEA group of pulsators. The new CCD photometric and spectroscopic observations of RXHya were obtained...
In this research we investigate the relationships between wind speed and temperature time series data in Bangkok, Thailand, from the time interval of January 2009 to December 2011 using wavelet transform (WT), cross wavelet transform (XWT) and wavelet coherence (WTC). The results from all three wavelet analysis show the strong periodicity around period 1 day (hourly data) and period band...
Now the Sun is in the 24$^{th}$ solar cycle. The peak of solar cycle corresponding to the number of the Sun activities, which one of them is solar flare. The solar flare is the violent explosion on the surface of the Sun and releases the high energy ion from the Sun to the interplanetary medium. Solar energetic particles or solar cosmic ray have important effect on the Earth, such as...
Nowadays, the studies of exoplanets are extensive and various. The different techniques are used to analyze the masses, radii and other specific data about exoplanets. HAT-P-47b transiting exoplanet candidate is a recent discovered low density sub-Saturn mass exoplanet. The planet is one of the lowest mass planets with the radius larger than Jupiter radius, which is a suitable candidate for...
Abstracts
The purpose was study about the properties of the insulation fibers panels from waste of tea leaves and water hyacinth. it mixed together in 5 ratio 100:0 , 80:20 , 50:50 , 20:80 , 0:100 with compress insulation by machine by 120 kg/square centimeter in 10 minutes product is flat size 400x 400 mm. and thickness is 10 mm. will produce insulation at a density of two...
The hybrid quantum mechanical/molecular mechanical (QM/MM) method has been used to investigate on mono-hydration and poly-hydration phenomena of the polar head group of Span 60 molecule in both gas and aqueous phases. Our calculations were performed by using Gaussian 09 program. The result indicates that Span 60 interacting with one water molecule shows the mono-hydration effect of the head...
Polypyrrole (PPy) have been considered as one of the most promising conducting polymers for gas sensor application due to it can operate efficiently at room temperature, light weight, thermal stability and high sensibility. In this research, we have been reported the geometric and electronic structure of PPy based on B3LYP/3-21G$^*$, B3LYP/6-31G$^*$ and SCC-DFTB methods. The effects of polymer...
This research is to study thermal efficiency of natural convection. Working principle of natural convection solar dryer is, once air in solar dryer is heated by solar energy, the air relative humidity will drop and floating up through the drying. This air will take moisture out of the product and flow out to ambient air. It was found from the experiment that, in the duration of 8.00 am – 4.00...
The objective of this research was to produce green fuel briquettes from corncobs by adding macadamia shell charcoal powder. The study was sectioned into 3 parts: 1) Quality improvement of green fuel briquettes by adding macadamia; 2) Fuel property analysis based on ASTM standards and efficiency on heat capacity; and 3) Economics appropriateness in producing green fuel briquettes. This...
Abstract
In microelectronic industry, the lubricants are used in the wafer-to-chip grinding and lapping processes before device assembly step. The based lubricant and additives play important roles in the product quality and reliability for those nano-scale fabrications. In this study, the tribological behaviors of AlTiC surface that sliding against AISI304 balls were studied in...
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Abstract
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Ultraluminous X-ray sources (ULXs) are non-nuclear, extra-galactic X-ray point sources with X-ray luminosity ($L_{\rm X}$) in excess of the Eddington limit for a 10 M$_{\odot}$ black hole ($L_{\rm X}$ $>$ $10^{39}$ erg s$^{-1}$). It is thought that the majority of ULXs are accreting black holes. However, due to their extreme brightness, the mass of black holes...
