bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characteristic of DBD plasma for ozone synthesis and its application on disinfection of chilli
Authors: Rodsong Puthita , Tirawanichakul Supawan , Tirawanichakul Yutthana 
Published: December 2019

Abstract
The main objectives of this work are to study effect of high voltage power supply on plasma dielectric barrier discharge (DBD) system to amount of ozone concentration and to preliminary study effect of ozone on disinfection of microorganism. The amount of ozone concentration generated by the plasma DBD was determined by the KI standard ASTM method while on-site research work, ozone concentration was measured by the Liverbond test kit. The experimental result showed that ozone concentration was relatively dependent on the voltage supply. The produced ozone concentration was varied between 10 and 100 mg/l of air flow rate relating to voltage supply. The characteristics of plasma discharges was also presented. For feasibility study of disinfection of microorganism on chili by ozonated water bubbling, the results showed that the dissolved ozone with 8 kV can reduce E.coli from 9×105 MPN/100 ml to 1×105 MPN/100 ml in 120 min duration time.
Dark matter from the inert Higgs doublet model
Authors: Treesukrat W , Uttayarat P 
Published: December 2019

Abstract
Dark matter is a clear evidence of new physics beyond the Standard Model. In this work, we consider the inert doublet model where dark matter is a member of a new Higgs doublet. In this scenario, dark matter properties can be calculated. We then test model predictions against experimental results such as the LHC Higgs data, the electroweak precision measurements and dedicated dark matter searches. In addition, we subject the model to theoretical constraints: perturbativity, vacuum stability and unitarity. Finally, we identify the viable parameter space of the model.
van der Waals parameters of inert, polar and non-polar gas molecules obtained from atomistic molecular dynamics simulations
Authors: Saeteaw Akarachai , Sawang Nuttawat , Sutthibutpong Thana 
Published: December 2019

Abstract
A series of atomistic molecular dynamics simulations were performed on the systems of gas molecules within an NVT ensemble, where the number of molecules, the volume and the temperature were controlled. For each simulation, simulated annealing technique was used to gradually vary the temperature and the change in gas pressure was measured within the simulation box at constant volume. Simulation results and regression analysis on the relationships between pressure and temperatures showed that two van der Waals parameters, representing interaction strength and effective size of the gas molecules, depended on shape, size and polarity of the molecules. This study provided an alternative way of demonstrating the basic thermodynamics of gas, and bridging the gap between information from microscopic and macroscopic scales.
An Arduino board with ultrasonic sensor investigation of simple harmonic motion
Authors: Buachoom A , Thedsakhulwong A , Wuttiprom S 
Published: December 2019

Abstract
An Arduino, one of the most popular microcontroller platforms, is widely used in teaching and learning STEM. It is really open source software and hardware, huge community, low cost boards and peripherals, and simple programming language. This research aims to develop an Arduino-based physics investigation of the simple harmonic motion (SHM) of mass on a spring. This rich cross curricular STEM activity integrates electronics, computer programming, physics, and mathematics in a way that is both experimentally exciting and intellectually rewarding. The experimental data are collected with the help of an HC-SR04 ultrasonic distance sensor and an Arduino Uno board. The data are then graphed and analysed using Microsoft Excel in real-time. The experiment data can be used to investigate Hooke’s law. The elastic constant of the spring, k = 16.54 N/m, is very close to the value determined from the period of the SHM. This Arduino-based investigation of SHM can be helped the students to improve both their experimental and theoretical skills.
Application of free surface synthetic schlieren method in determining surface tension from a light floating object
Authors: Pathommapas C , Yapo S , Seesomboon E , Pussadee N 
Published: December 2019

Abstract
Free surface synthetic schlieren (FS-SS) is a liquid surface topography visualization technique relying on apparent dot pattern displacement due to liquid surface deformation. It has gained attention in the fluid visualization field due to its relatively simple and inexpensive setup. One of the most powerful features of the FS-SS technique is the 3D topography of deformed liquid surface, in which submillimeter scale changes can be readily observed in great detail. The visualization of liquid meniscus at the solid interface is proposed in this study to calculate surface tension by equating the surface tension force with weight of light, floating object with circular geometry. It was found that surface tensions of liquids are much greater than anticipated, suggesting that the effect of buoyant force of displaced liquid due to deformed interface cannot be neglected. When the buoyant force is included, the calculated surface tension of liquids are within 10% of the reference values.
Motion Blitz: a new card game for assessing students’ thinking level about physics
Authors: Thunyaniti T , Wuttiprom S 
Published: December 2019

Abstract
Critical thinking and problem-solving skills are crucial for the 21st century. Game-based learning (GBL) is a powerful teaching strategy for fostering these skills amongst students. GBL can reinforce knowledge and bridge the gap between what is learned by creating dynamic, fun, and exciting learning environments. This research developed a card game called “Motion Blitz” for teaching the physics concept of motion in one and two dimensions. Motion Blitz is a quick matching card game that consists of a deck of “Motion Cards” which picture motions in daily life and a selection of “Motion Symbols” displaying a path of motions: linear, projectile, circular, rotational, rolling, and simple harmonic motions. To play the game, one player starts by flipping over one of the “Motion Cards”, then simultaneously everyone tries to figure out the proper “Motion Symbol” to grab. Figure it out and grab the right one to get the card/point. After playing, the teacher uses questions to stimulate student thinking and help students construct scientific knowledge. Finally, 12 questions according to Bloom’s taxonomy are administrated to students. These questions are classified according to different cognitive levels ranging from low-level thinking (knowledge, comprehension) to high-level thinking (application, analysis, synthesis, and evaluation). Data analyses showed Motion Blitz’s ability to elevate students’ thinking level, over 90% of students scored well at a low level and 59% at a high level approximately. In addition, data indicated that students’ thinking scores became lower at a higher level of thinking.
Effects of time delay in no-knowledge quantum feedback control
Authors: Saiphet Jirawat , Chantasri Areeya , Suwanna Sujin 
Published: December 2019

Abstract
The no-knowledge quantum feedback, introduced in Phys. Rev. Lett., 113, 020407 (2014), is a measurement-based feedback protocol for decoherence suppression in a quantum system coupled to noisy environment. By continuously measuring the environmental noise, without directly gathering any information about the system, the decoherence effect can be suppressed by feeding back quantum controls proportional to the measured signal. In the original work, the feedback control was assumed instantaneous, leading to perfect cancellation of noise backaction on the quantum system. However, the instantaneous feedback is difficult to achieve in practice, and close-loop feedback protocols are always associated with finite delayed time. Therefore, in this work, we consider the effects of the delay between the time at which the measurement signal is acquired and the time that such signal is fed back to the system. We investigate the problem with an example of a two-level system (qubit) coupled to a Markovian reservoir, via a Hermitian coupling operator, where a homodyne detection is used to measure the environmental noise. We numerically simulate quantum stochastic trajectories of the qubit and analyse their averaged dynamics. We find that the feedback control with time delay can either enhance or reduce the decoherence effects, depending on whether the delayed time is in-phase or out-of-phase with the unitary dynamics of the qubit system.
Electronic structures of CsPb(XxY1–x)3 perovskites
Authors: Wanwieng Nontapat , Kaewmeechai Chaiyawat , Laosiritaworn Yongyut , Punya Jaroenjittichai Atchara 
Published: December 2019

Abstract
We investigated electronic structures of CsPb(X
x
Y1–x
)3 perovskites, where X, Y = Cl, Br, or I, and x = 0, 1/3, or 2/3, based on the density functional theory (DFT) with generalized gradient approximation (GGA). The results show that these materials exhibit direct and inverted gaps, in the sense that the character of electronic states near the valence band maximum (VBM) is derived from atomic s-like orbital of Pb and p-like orbital of halide atom, whereas the character of states near the conduction band minimum (CBM) is derived from atomic p-like orbital of Pb in contrast with the electronic band structures of other common semiconductors. Their density of states also indicates that the optical transition in both absorption and luminescence are stronger.
Fabrication and properties of flexible CaCl2/P(VDF-HFP) composite films
Authors: Yuennana Jureeporn , Muensit Nantakan 
Published: December 2019

AbstractAn emerging trend in the development of smart electronics has great attracted the interest of scientists and engineers to fabricate hydrofluorpolymer composites that provide the large dielectric property and electroactive phase. This work has investigated the effect of calcium chloride (CaCl2) on morphology, structure and dielectric properties of poly (vinylidenefluoride-hexafluoropropylene) (P(VDF-HFP)). The CaCl2/P(VDF-HFP) composite films was prepared by a solution casting method. The addition of CaCl2can obviously induce the formation of the electroactive β-phase in P(VDF-HFP) films without any modification of P(VDF-HFP) chains or mechanical stretching treatment. The microporous composite films have better properties, such as high flexibility, thermal stability, β-phase fraction (97%) and dielectric constant (17), than the unfilled one.
Physical properties of RR Lyrae variables in Galactic globular clusters and dwarf spheroidal galaxies
Authors: Benkortem S , Tanakul N , Suwannajak C , Pattarakijwanich P , Yuma S 
Published: December 2019

Abstract
We propose a tool to distinguish between Galactic globular clusters (GCs) and dwarf galaxies based on physical properties of RR Lyrae (RRL) variables in the systems. Normally, these two systems show various distinctive properties; for instance, mass, size, and luminosity. Nevertheless, these properties overlap each other in recently discovered systems. The subsequent classification between GCs and dwarf spheroidal (dSph) galaxy is ambiguous. An RRL variable is a pulsating variable star with a short period of 0.2-1 days. It is relatively easy to observe the complete period of its light curve. The age of RRL stars is typically more than 10 Gyr; therefore, they can provide information of the host system at its early stage. In this study, we provide an extensive data collection of RRLs in 96 GCs, 23 dSphs, and 10 dwarf irregular (dIrr) galaxies. Based on public catalogs, we analyze various RRL properties such as Oosterhoff dichotomy, fraction of high amplitude short period (HASP) variables, metallicity, and specific frequency of RRLs (SRR). We examine correlations among all properties in an attempt to distinguish between GCs and dSphs.
Study of the relation between torsional shear stress and transverse torsion angle of cable
Authors: Mukdapitak S , Kasayapanand C , Trakulhun P , Puntree J 
Published: December 2019

Abstract
The relation between torsional shear stress and transverse rotational angle of earphone cable was investigated due to hypothecated to play an important role in the cable entanglement. The cable was hung with a circular plate and attached to force sensor on top. The experiment was carried out by rotating the plate stepwise at 90 degrees each for 80 times reaching 7200 degrees in total. Experimental results exhibit the fluctuation of longitudinal force with period almost exactly equals to a complete circle of transverse rotational displacement. It is also found that average longitudinal force tends to increase with counter clockwise rotation while decreasing in clockwise direction. We then conclude that the relationship between torsional shear stress and transverse torsion of the cable can be described by trigonometric function with linear changing of average amplitude.
Scintillation response of CdWO4 scintillator for gamma-ray detection
Authors: Phunpueok Akapong , Thongpool Voranuch , Jaiyen Sarawut 
Published: December 2019

Abstract
At present, scintillation materials are playing a major role in medical radiation detection. They are being used for various scans including CT scan, PET scan and SPECT scan. In this work, the researchers studied the scintillation response of the CdWO4 (CWO) crystal compared with the Bi4Ge3O12 (BGO) crystal. The energy resolution and light yield values were tested using a photomultiplier tube (PMT) readout. The gamma source was aligned along the cylindrical axis of the crystal and the PMT. The energy spectra were then recorded using a PC-based multichannel analyser (MCA). From the results, it was found that the energy resolution of 6.5 % obtained from the CWO crystal was superior than that of 9.3 % obtained from the BGO crystal of 662 keV gamma-ray energy. The CWO crystal displayed about two times greater light yield than the BGO crystal. In the energy range from 32 keV to 1, 408 keV, the degree of the light yield non-proportionality of 0.13 obtained from the CWO crystal was also more exceptional than that of 0.19 obtained from the BGO crystal. The photo-fraction of both crystals was also discussed.
3D printing of interdigital sensor based conductive ABS for salt and sucrose concentration sensing
Authors: Ponan W , Harnsoongnoen S 
Published: December 2019

Abstract
This paper reports the application of three-dimensional (3D) printing to the fabrication of an interdigital sensor based conductive acrylonitrile butadiene styrene (ABS) for salt and sucrose concentration sensing. The substrate and interdigital sensor are fabricated by 3D printing based ABS and conductive ABS filament, respectively. The interaction between the samples and interdigital sensor was analyzed based on a direct current circuit. The proposed sensor was tested for the electrical current response to salt and sucrose at various concentrations ranging from 0 to 10 % (W/V) with steps of 2 % (W/V). The experimental results confirmed that the electrical currents were linearly changed when the concentration of salt and sucrose was changed. Moreover, it has a wide dynamic range and offers rapid lower-cost measurement. The proposed technique offers an opportunity for the development of salt and sucrose meter systems.
The effects of atmospheric plasma jet treatment to the germination and enhancement growth of sunflower seeds
Authors: Nantapan J , Sarapirom S , Janpong K 
Published: December 2019

Abstract
Using the plasma technique, the sunflower seed was treated by means of argon plasma. The argon plasma was driven by high voltage DC pulse at 25 kHz. Plasma dissipated power was varied at 0.41, 0.51, 0.61 and 0.72 watts and argon gas flow rate was fixed at 4 liters per minute for 15 sec. The experiment analyzed the physical properties, chemical properties and growth rate. Concerning the physical properties, the morphology was checked via the contact angle and roughness by SEM. The chemical properties were analyzed via contact angle. The growth rate was checked using 4 processes: the 1st is the water uptake, the 2nd is germination count rate within 5 days, the 3rd is seeding length within 7 days and the 4th is dry weight of seeding with 80 °C in the oven for 24 hrs. The results show the contact angle of control is 41.08 degree. After treatment using plasma jet the contact angle decreased, henceforth the wettability increased. Using increased plasma power the surface roughness increased. The water uptake of plasma with dissipated power at 0.41 watts gave the best result. Following plasma dissipated power at 0.41 and 0.61 watts respectively the germination count rates are 68% and 56%. The seeding length as well as the dry weight decreased when the power increased.
Roles of driven current locations on ETB and ITB based on three-field bifurcation concept
Authors: Dang-iad A , Chatthong B 
Published: December 2019

Abstract
This work investigates the roles of external current source on the formation and effectiveness of an internal transport barrier (ITB) and an edge transport barrier (ETB) in fusion plasma using bifurcation approach. Thermal, particle and toroidal momentum transport equations are solved simultaneously for the spatiotemporal profiles of plasma pressure, density and toroidal velocity, respectively. The transport effects include neoclassical and turbulent terms with constant coefficients assumption. The turbulent suppression, leading to intrinsic formation of transport barriers, is driven by the magnetic shear and the flow shear. Residual stress effect is included in this work. Thermal, particle and torques sources are locally provided based on Gaussian shape distribution at plasma center, plasma edge and plasma center, respectively. The effects of off-axis driven current locations on ITB and ETB formations are investigated. In particular, width and height of ETB and ITB are shown to be affected by the source. It is found that off-axis of driven current can increase plasma temperature, density and toroidal velocity at its core because ITB is formed and expanded. However, size of ETB pedestal is slightly affected by the location of driven current. When the location of driven current is changed from r = 0.00 to 0.60, ITB width changes from r = 0.00 to 0.12 of plasma profile and ITB top formation location changes from r = 0.00 to 0.80.
The students’ basic conceptions of buoyant force
Authors: Wongsuwan Wachirawut , Huntula Jiradawan 
Published: December 2019

Abstract
The conception of buoyant force is an advanced concept. If students need to solve the problem on the buoyant force, they have to understand basic concepts which are mass, volume, force, pressure, and density. For solving the problems about buoyant force, students need to make a decision and use many concepts to solve the problems. The difficulty of solving a problem about buoyant force is students cannot construct and link their own related knowledge to solve the problem. In this study, the purpose was to study students’ basic concept in buoyant force of grade 10 and grade 11 students. The target group consisted of 18 students in Phangwittayayhon school. Two-tier multiple choice was used as a conceptual test in this research consisting of eight items. All of students were taught about the buoyant force concepts before doing the conceptual test. The data were analyzed by descriptive statistic. The results showed that more than 80 percent of students have many alternative basic concepts which are related to buoyant force including mass, volume, depth, pressure, and density even they have already studied buoyant force since they were in grade 9.
Effect of Polyaniline content on the capacitance of Polyaniline/Carbon powder composite
Authors: Rattanaveeranon Santi , Asanithi Piyapong 
Published: December 2019

Abstract
Developing capacitor with high capacitance and power capacity has received much attention in the scientific research. This research aimed to study the effect of polyaniline (PANI) content on the capacitance of the capacitor fabricated from PANI/carbon powder composites. Wasted-sweet potato was used as the source of carbon for synthesizing carbon powder (CP). Two types of CP were considered in the study, including with and without sulfuric acid pre-treatment. For CP without acid treatment, the sweet potato was heated at 900 °C for 2 h in argon atmosphere. For CP with acid treatment, the sweet potato was reacted with concentrated sulfuric acid for 2 h and then heated at 900 °C for 2 h in argon atmosphere. Both samples were ground before use. PANI contents of 0-5 %wt were used to combine with the CP samples. SEM, FTIR and potentiostat/galvanostat, respectively, investigated the physical, chemical and electrochemical properties of the composites. The electrochemical results showed that 5 %wt PANI composited with acid-treated CP provided the highest specific capacitance of 304.87 F/g. This composite also showed high stability under charge-discharge investigation. This study confirms that carbon powder synthesized from wasted-sweet potato composited with PANI can be useful for developing supercapacitor.
Light curve analysis of a transitional millisecond pulsar PSR J1023+0038 with Kepler K2 mission
Authors: Nilarat C , Jaroenjittichai P , Jaroenjittichai A P 
Published: December 2019

Abstract
PSR J1023+0038 has been known as a transitional pulsar-low-mass-X-ray binary (LMXB) system, which provides crucial information in understanding the evolution of pulsars in binary systems. We report analysis of 80-day continuous optical light curve of PSR J1023+0038 with the Kepler observations during K2 mission. The light curve was observed from May to August 2017, where the system appeared to be in its LMXB state. At ∼30 minutes time resolution, the data were fitted with a Gaussian window function, which generated a smoothed light curve with 100, 000 from 3545 raw data input. The time at the maxima and minima of the light curve was measured and compared with the orbit ephemeris predicted from a quadratic polynomial function published by previous work. We found that at MJD ∼57935 there appeared to be a constant delay of ∼1.06 hr added to the orbit, which then gradually recovered to the expected period at MJD ∼57965. Possible causes have been proposed to explain such delay includes a third body involvement or hot spots on the star.
Microstructure and electrochemical study of equal channel angular pressed Al-Zn alloys
Authors: Khamnantha P , Linjee S , Palsson N S , Banjongprasert C 
Published: December 2019

Abstract
This research focuses on the effect of severe plastic deformation (SPD) on microstructure and properties of Al and Al-Zn (in 1, 2, 3, 4, 5 wt%) anodes of Al-air battery. The Al-Zn alloys with a diameter of 12.5 mm and 62.5 mm long were pressed in an ECAP die (press angle $=90°, XP=20°), using route Bc with 2, 4, 6, 8 passes at room temperature. Microstructural characterization was carried out using scanning electron microscope (SEM). The cast samples were solutionized at 450 °C for 1 hr after pressing. Grain size of the as-ECAP samples decreased with an increase of ECAP passes. The smaller grain size resulted in strengthening of Al-Zn. An decrease in grain size was due to significant change in the microstructure from an intensive shear stress after ECAP. Polarization test in a 3.5wt% NaCl solution were used to study electrochemical behaviours of the as-cast and ECAP Al-Zn alloys. The conclusion from the research will be used as a platform to develop Al anodes for Al-air battery in the future.