bluuebunny/crossref_metadata_2025_split huggingface dataset:
The analysis of the perforation of the bullet 11 mm. on the metal sheet
Authors: Eksinitkun G , Phungyimnoi N , Poogun S 
Published: December 2019

Abstract
The bullet hole traces from both entrance and exit at the crime scene are important data which can be used in the investigation. Most of the analytical investigation will be mostly considerably on the physical appearance e.g. tear, traces of gunshot, the size of the entrance and exit bullet holes. The purpose of this research was to study the pattern and the difference of marks on the metal target caused by the collision of gunshots using 4 types labeled as A is Full Metal Jacketed (FMJ) 135 gr. of Thai Arms., B is Jacketed Hollow Point (JHP) 230 gr., C is Full Metal Jacketed (FMJ) 230 gr. and D is Lead Semi Wad Cutter (LSWC) 200 gr. all of Bullet Master, shot from a Colt Gold Cup 11 mm caliber at 7 different distances as 0.00, 0.15, 0.50, 1.00, 1.50, 2.00 and 2.50 meters to records a diameter of bullet hole. In this experiment, the shot at the close range could be seen most clearly physically. On the metal target, ring of the black gunshot residue around the collapse entrance of bullet holes and a tear at the exit of the bullet was appeared. The physical properties of bullet hole on the metal sheet of each bullet type are different that can basically inform about type of bullet (p < 0.05), at the 95% confidence level but the size of bullet hole can’t use for identity shooting distance.
Development of DAS for prototype of brinell-macro-hardness tester using triplex of force-resistive-sensors manipulated by raspberry pi 3 model B
Authors: Muangma Rakdiaw , Supawan Kanitta , Thepnurat Meechai , Saphet Parinya , Tong-on Anusorn 
Published: December 2019

Abstract
The resulting of advanced technology, the size of Personal Computer (PC) was reduced into the same size as cigarette box. Thus, the Brinell-macro-hardness tester used Raspberry Pi 3 (RPi3) Model B to acted as the Data Acquisition System (DAS) or the mini-PC which used for measuring of Active-Weight-Loading (AWL) parameters. This DAS used the triplex of force-resistive sensors equipped using IC-MCP3008 and interfaced with RPi3. This IC was used to converse the analogue signal of AWL to 10 bits of the digital signal, and then, the digitalized-data were transferred through the Serial Peripheral Interface (SPI) of RPi3, respectively. In the acquisition procedure, the real-time of measuring-data were revealed using the Graphical User Interface (GUI) which developed using the python language version 2.7. Consequently, it was perceived that this DAS can be fabricated using simple and low-cost design. Therefore, this contrivance can be regularly used for AWL measurement which is the one part of Brinell hardness measurement. Finally, the fabrication of electronic parts and software interfacing which manipulated using RPi3 were presented in the discussion section.
Thai national telescope studies of ultraluminous X-ray sources
Authors: Thongpoyai K , Luangtip W , Sawangwit U , Roberts T P , Komonjinda S , Dhillon V S , Marsh T R 
Published: December 2019

Abstract
Ultraluminous X-ray sources (ULXs) are extra-galactic, non-nuclear sources with X-ray luminosity in excess of 1039 erg s–1. It has been thought that the majority of ULX populations are stellar-mass objects accreting matter at a super-Eddington rate. Although ULX studies are often focused in the X-ray regime, this work studied the ULXs in the optical regime, identified as the ULX counterparts (CTPs). The optical variability of nine CTPs were observed using the 2.4-m Thai National Telescope. Out of the nine ULXs, we detected three ULXs exhibiting strong variability up to ∼1 magnitude, suggesting that the CTP light does not come from the donor star’s emission. The paper discusses the physical origins of the variability which potentially explain the observed light curves.
Prediction of the bitterness of pharmaceutical drugs using a taste sensor with representative group data by the center of mass
Authors: Pradhan Sarika , Jityen Arthit , Osotchan Tanakorn 
Published: December 2019

Abstract
The purpose of this study is to analyze the effectiveness of taste sensing system to predict the bitterness of six commercial pharmaceutical drugs including amoxicillin, paracetamol, phenylephrine, cetirizine, quinine, and ranitidine. The taste sensing system consists of Ag/AgCl as a reference electrode, platinum rod as a counter electrode and modified electrodes as working electrodes. The four different working electrodes had been fabricated by using CoPc, MnPc, FePc and ZnPc mixed with multi-wall carbon nanotube, respectively. The cyclic voltammogram of 1 mM of pharmaceutical samples was run at a scan rate of 0.09 V/s, with the potential range between -1 and 1 V. The wavelet analysis was used to reduce and extract the main feature of data. By using coordinates in the two-dimensional space of principal component analysis, the Euclidean distance of each sample was calculated with respect to coordinates of Acesulfame K. The coordinate of Acesulfame K was used as the point of reference. According to machine learning, the k-mean clustering and center of mass approach were used to locate the centroid of coordinates of the samples in the principal component analyses. The calculated Euclidean distances from the centroid point were directly associated with the intensity of bitterness of the samples. To further validated the ranking of bitterness drawn from taste sensing system, the data were correlated with the bitterness ranking drawn from gustatory sensation test. The good correlation was obtained between machine and human sensory ranking.
Circumbinary planet study around NSVS 14256825
Authors: Sappankum P , Komonjinda S , Awiphan S , Rattanamala R , Dhillon V S , Marsh T R , Suphapolthaworn S 
Published: December 2019

Abstract
The period variability of (O-C) diagram of an eclipsing binary, NSVS 14256825, which is composed of a hot subdwarf type OB star (sdOB) and a main-sequence low-mass type M star (dM) in close orbit with period P=0.110374 days, previously showed sinusoidal signal cause by the light travel time effects. This signal can be caused by the presence of third bodies. We re-examined (O-C) diagram of the system. We combined eclipse timings from published data and the data taken from ULTRASPEC at 2.4 m at Thai National Telescope on November 2018. From the fitting model, the parameters of the third body in NSVS 14256825 system are obtained.
DIY small scale resonance tube for measuring the speed of sound in air
Authors: Wijitwongwan P , Wuttiprom S 
Published: December 2019

Abstract
This research invented a small scale with no cost experimental set to determine the speed of sound in the air by resonance method. Equipment consisted of a bubble tea straw with label measuring scale, a full plastic water bottle and the n-Track Tuner (iOS) or Guitar Tuner (Android) application for generating sound waves. Sound waves were sent down a bubble tea straw filled with an air. The waves reflected back up the straw from a water surface and interfered with the waves traveling downward. By properly adjusting the water level, a resonance condition could be established. By knowing the frequency of the sound wave and the position of the water level for two different resonant lengths, the speed at which sound waves travel through the air was found. In this experiment, the frequency was specified 1, 500 Hz at 24.00 °C, 26.00 °C and 30.00 °C respectively. The sound speed which was calculated was 345.0, 347.0 and 349.0 m/s respectively. The standard value of sound speed at the same temperature was 345.4, 346.6 and 349.0 m/s respectively. The percent error value of the sound speed was calculated to compare with the standard value of sound speeds was 0.1%, 0.1% and 0.0% respectively. This an experiment was effective and could be efficiently used in educational physics. Moreover, it is easy to use, low cost, and portable. Students can also prepare the equipments themselves.
Macroscopic model for multi-anticipation self-driving cars
Authors: Nateeboon T , Termsaithong T , Hirunsirisawat E 
Published: December 2019

Abstract
Self-driving cars technology and vehicle connectivity enable self-driving cars to precisely receive information of many cars leading them. By multi-anticipation, a flow of self-driving car is proved to be more stable than without multi-anticipation. The instability of traffic flow can cause a traffic jam as a little velocity fluctuation is amplified. In this work, we discuss the macroscopic effect of parameters in the microscopic model for a self-driving car. Those parameters are the number of the vehicle the car anticipate (field size) and weight for anticipation with the leadings (strength factor). The macroscopic model is derived from the microscopic model. We obtained a partial derivative equation that describe how the velocity fluctuation change through time. According to our model, these two variables play a crucial role in the traffic flow harmonization. Comparison between each model was carried out and discussed.
Josephson current in silicene-based SBS Josephson junction: Effect of perpendicular electric field
Authors: Suwannasit T 
Published: December 2019

Abstract
The Josephson effect in silicene-based superconductor/barrier/superconductor (SBS) junction is theoretically investigated by the Dirac-Bogoliubov-de Gennes equation, where superconductors are the proximity effect through superconducting gates and a thick barrier is the presence of a perpendicular electric field and an electrostatic gate. The influence of electric field is used for inducing a bandgap in monolayer silicene. We find that the Josephson current is controlled by the effect of electric field EZ. The behavior of critical current IC
on the perpendicular electric fields is linear dependence at case of VG = 0. The gate control of electric field is led to the linear slope d(IC
/I
0)/dlEZ
as revealed to 1/EF
and –1/EF
in the different direction of electric fields. In addition, the linear dependence of the Josephson current is considered by the electrostatic gate VG
. The appearance of linear effect in the tunable barrier is near the bottom of conduction band and the top of valence band. These results are suitable for controlling the Josephson current in silicene-based junction.
Numerical study of radial force and equilibrium position of microscale spherical particle under the effect of inertial focusing in 2D microchannel
Authors: Natyanun S , Pussadee N 
Published: December 2019

Abstract
Particle inertial focusing is a passive phenomenon at which a particle is acted upon by interaction with fluid and a channel wall, causing it to align at a certain distance from the channel wall called the equilibrium position as all transverse forces balance. In this work, numerical simulations using the finite element method were conducted in order to evaluate the forces acting on a spherical particle under Poiseuille flow in a 2D microchannel. Various fluid and particle parameters investigated include fluid density, viscosity, mean flow velocity, particle and channel dimensions. The calculated particle’s equilibrium position in relation to each individual parameter is found to be proportional to the square of mean fluid velocity and fluid density, and the cube of particle size while inversely proportional to channel half-width and the square of fluid viscosity.
Effect of blade number and angle on the characteristics of the savonius type wind turbine
Authors: Chaichana T , Thongdee S 
Published: December 2019

Abstract
The savonius type vertical axis wind turbine can be operated in all wind directions, is low cut in speed and high in torque. Therefore, it is a potential source of energy in low wind areas. This research aimed to compare the performance of H-Savonius vertical axis wind turbine using blades numbers and blades angle. The turbine containing the blades numbers 4, 6, 8, 12, 16 and 18 with the blades angle being at -15°, -5°, 0°, 5° and 15°, respectively. Tests were undertaken at open type circuit wind tunnel. The results showed that the maximum power coefficient of the wind turbine at 16 blades and angle of 5° with an average of 0.26 which had 4.5 % increase in power compared to that of turbines the baseline. Finally, the cut in wind speed and the rev up time was 2.32 m/s and 25 s, respectively.
Design and development of rotary magnetic refrigeration prototype with active magnetic regeneration system
Authors: Lupponglung V , Kanluang T , Panjatawakup P , Hanlamyuang Y , Matan K , Techapiesancharoenkij R 
Published: December 2019

Abstract
In the field of cooling system, a traditional vapor compression (VC) technology has been used over long time. The VC cooling is simple and cost effective, however, it raises global warming concern due to its relatively low energy efficiency and usage of ozone depletion substances. Magnetic refrigeration (MR) has been proposed as a potential cooling technology that can replace the VC cooling. MR can potentially be operated with efficiency closer to the theoretical efficiency, without using environmentally-harmful refrigerants. In the MR system, a magnetocaloric material (MCM) with magnetocaloric effect (MCE) is used as a refrigerant. The temperature of MCM can be increased and decreased under adiabatic magnetization and demagnetization, respectively. Water/ethylene glycol can be used as heat-exchanging fluid. In this work, a rotary MR prototype was designed and built. The prototype consists of the following main systems: 1. Flow distribution system, 2. Rotary magnetic field generator 3. Mechanic system, and 4. Temperature and pressure sensor system. Four beds of magnetocaloric gadolinium (Gd) particulates were used as an active magnetic regenerative cooling media. Fluid flow was controlled by pneumatic pump and solenoid valves. Rotary magnetic field generator was designed and built with maximum and minimum fields of 0.65 and 0 T, respectively. The overall setup and preliminary study showed that the pressure drop across the system was 2 bar when the flow rate was only 0.5 L/min. Increasing flow rate further resulted in too high pressure drop causing the MCM bed to swell. Therefore, the flow rate was limited to 0.5 L/min resulting in insufficient heat transfer rate by the slow heat exchange fluid flow. Consequently, the maximum temperature span was measured to be 0.5 K. The prototype must be improved to drive flow rate higher and to reduce the pressure drop of the system.
Impedance measurement system simulation for trapped cell model in various microwell geometries
Authors: Sanin Sorawit , Pakpum Chupong , Pussadee Nirut 
Published: December 2019

Abstract
Single cell analysis is a measurement or detection of individual cell properties and responses. The method is of significance due to stimulated responses of any individual cell are different depending on their morphology and functionality. Therefore, detected properties from a group of cells cannot be used to represent that of the individual cell. Since cells can move freely in a microfluidic system, a trap must be added to the system to fix the cell position at the detection region for long period observation and assay. One of the most popular used cell trap in the biomedical field is a microwell array. A sensitive technique for measuring single cell properties is an impedance measurement, in which small change in electrical properties of the cell and the surrounding medium between excitation and pick-up electrodes is recorded. However, the microwell placed between two electrodes acts as an electrical insulator to reduce the signal passing through the system. This paper focuses on the effect of microwell geometry parameters generated from the design of experiments (DOE) software on detected signals using finite element simulation software. The study found that the microwell wall thickness affects the detected current signal most significantly and the optimized geometry that minimally reduces measured current signal was 20 µm height, 5 µm well thickness, and 16 µm gap size.
Searching for the electron/positron pair halo of the Blazar H1426+428 using XMM-Newton
Authors: Kueathan A , Luangtip W , Eungwanichayapant A 
Published: December 2019

Abstract
Electron/positron pair halo is a physical phenomenon in which the very high energy gamma rays emitted from Blazar interact with cosmic infrared background (CIB) so that produce the electron/positron pairs; the produced electron/positron pairs could up-scatter the cosmic microwave background (CMB) reproducing the gamma-rays, thus these form the cascade process of producing the electron/positron pairs appearing as an halo around the blazar. In case that the halo presents in the ambient strong magnetic field, the electron/positron pairs could emit X-ray light via synchrotron process providing another opportunity to detect the halo. In this work, we search for the X-ray emission from the halo of the Blazar H1426+428 using the observed X-ray data from XMM-Newton observatory. The X-ray spectra of the halo are carefully extracted from the annulus, source free regions around the Blazar to avoid the X-ray contaminations from the Blazar itself and the nearby point sources. These spectra were fitted using the physical model which takes into account the emissions from the unresolved cosmic X-ray and instrument backgrounds. The unresolved flux of ≍ 10–13 erg s–1 cm–2 have been detected in the regions, and we argue that, at least, some fraction of the flux might be the emission from the halo.
Simple improvement in latent fingerprint detection with Ninhydrin/water glue on thermal paper
Authors: Eksinitkun G , Pansiw S , Phutdhawong W 
Published: December 2019

Abstract
Thermal paper is a special type of paper that is coated with chemicals on the paper layer to change color when exposed to heat. When discovering fingerprints by using chemical reagents such as ninhydrin solution with thermal paper, it shows black staining background on the heat-sensitive front side. Thus, the latent fingerprints cannot be discovered. In this study, we have reported the first utilization of ninhydrin with water glue in different ratios for the development of latent fingerprints on the thermal papers. The results showed that at 0.020-0.060 g/mL of water glue in ninhydrin solution reduced the black strain after tested with thermal paper and made the appearance of the fingerprint more clearly. So, the detectable minutiae can be used for visualization and identification of latent prints. Using an Automated Fingerprint Identification System (AFIS), it is showed between 59-87 points of minutiae. As the results, this method could be used as an alternative method to developing latent fingerprints with non-hazardous materials, reduce costs and easy to find.
The cancellation of human sounds using synthesized soundwaves
Authors: Srijomkwan K , Weerasakul C , Kittiweerawong S , Puntree J 
Published: December 2019

Abstract
The principle of destructive interference is applied to reduce or eliminate the spoken sound in order to increase speech privacy. This research is divided into two parts: the synthesis of sound from formula, using both analytical linguistics and physical approaches, and the actual cancellation of simple to complex sounds in the real world setting. The results suggested that in a real-world setting, up to 60% intensity reduction could be repeatedly detected. When the complexity of the sound is increased, difference in interference pattern could be detected between sounds in frequency range within the human hearing spectrum. Furthermore, it is found that the generation of negative sound using the four formants is not comprehensive enough to interfere effectively with actual sound, therefore the spectral slice is needed to synthesize more complex sounds. After testing various variations, it is found that using 11 most intense frequency components adjusted in proportion according to each original amplitude best cancel the widest range of human sound samples. This method was used to test the effectiveness of actual human sound cancellation. Though effective cancellation was detected in the high frequencies range of the sound spectrum, other frequency ranges were barely affected. The difference between cancellation patterns of each frequency range might need investigating before the cancellation of human sound can be effectively applied in real life.
Droplet transport from main HT-6M poloidal limiter
Authors: Somboonkittichai Nopparit 
Published: December 2019

Abstract
The HT-6M is a tokamak installed only with a main metallic poloidal limiter, which may not tolerate energy deposition due to a limited plasma-wetted area. This leads to the production of fresh metallic impurities, including macro-particles, in its main vessel. The macro-particles are transported and then ablated far away from where they were created. Understanding transport and ablation is beneficial to characterize impurity generation in the HT-6M, which will be recommissioned in Thailand in the next few years. A computational study simulated the motion of macro-particles in the HT-6M using the specifically written Dust and Droplet Tracking (DDT) code with the steady state HT-6M plasma profiles produced from the Transport Analyzing System for tokamaK (TASK) code. The results showed that a substantial amount of vapor containing impurities in the scrape-off layer (SOL) plasma was produced by the ablation of the liquid macro-particles emitted from the HT-6M poloidal limiter when the macro-particles were located near the limiter and nearby plasma-facing components (PFCs). Heavy ablation on the macro-particles transported directly towards the core plasma led to complete vaporization locally. The updated DDT code is discussed.
Phase transitions in the frustrated antiferromagnetic XY model on the triangular lattice
Authors: Klawtanong M , Srinitiwarawong C 
Published: December 2019

Abstract
Phase transitions and thermodynamics properties of the frustrated antiferromagnetic XY (FAXY) model have been investigated near the two transition temperatures. We found that the Kosterlitz-Thouless (KT) transition corresponding to the rotational U(1) symmetry breaking and the Ising-like (I) transition corresponding to the reflection Z
2 symmetry breaking occur at two-separate transition temperatures, Tkt
< TI
. These temperatures lie close to each other, however in our results the separation is obvious. Our results show the order parameters as a function of temperature and we also estimate the critical exponents, β, α, γ, η and ν. The critical exponent ν indicates that the Ising-like transition is inconsistent with the Ising universality class.
Luminosity function of high-z object candidates at the epoch of reionization (z ≳ 6) in cosmic evolution survey (COSMOS) field
Authors: Thananusak N , Sawangwit U , Wannawichian S 
Published: December 2019

AbstractThe investigation of the luminosity functions (LF) of objects at the epoch of reionization or EoR (z≳ 6) is crucial for placing stronger constraints on the contribution of different ionizing photon sources. In this study, we aim to estimate the luminosity functions ofz≳ 6 candidates. The data catalog obtained from Hyper Suprime-Cam Strategic Program (HSC-SSP) ultra-deep survey data released one and the ultra-deep Visible and Infrared Survey Telescope for Astronomy (UltraVISTA) data released four in optical(rizy)and near-infrared(YJHKs)photometry filters, respectively. We focus the deep survey on Cosmic Evolution Survey (COSMOS) field, centered at RA ∼ 10h00m28.6sDEC ∼ +2°12′21.0″. The 79 candidates are selected by the Lyman Break Galaxies (LBGs) technique withzband drop-out, and photometric redshift approximation (photo-z). We then used the candidates to calculate thez≳ 6 LF. Accordingly, we compare the LF with other works that focus on the high-zobjects at similarz-range.