bluuebunny/crossref_metadata_2025_split huggingface dataset:
Two dimensions modelization of radiative exchange in polar bears’ fur
Authors: Rchida Lamiaâ , Rattal Mourad , Bahou Younouss , Mouhsen Azzeddine , Harmouchi Mohamed , El Mostafa Oualim  
Published: February 2023

Abstract
To survive in the Arctic, polar bears must have excellent thermal insulation to endure high winds and extreme cold. As a result, mastering the mechanisms responsible for arctic animals’ superior radiative insulation will be aided by knowing the radiative exchanges in their fur. A mathematical model was created for this purpose by integrating the coat’s hairs into thin sheets. Then, using MATLAB, a computer simulation was run to determine the temperature variation as well as the energy flow between the external environment and the polar animal’s body through the hairs. With such thermal qualities, the proposed model will have a good insulating capacity, allowing it to recreate the structure of polar bear hair and incorporate it into real-world applications, such as serving as just a thermal insulator for keeping the heat in a house during the winter.
Testing gravity with gravitational waves × electromagnetic probes cross-correlations
Authors: Scelfo Giulio , Berti Maria , Silvestri Alessandra , Viel Matteo 
Published: February 2023

Abstract
In a General Relativistic framework, Gravitational Waves (GW) and Electromagnetic (EM) waves are expected to respond in the same way to the effects of matter perturbations between the emitter and the observer. A different behaviour might be a signature of alternative theories of gravity. In this work we study the cross-correlation of resolved GW events (from compact objects mergers detected by the Einstein Telescope, either assuming or excluding the detection of an EM counterpart) and EM signals (coming both from the Intensity Mapping of the neutral hydrogen distribution and resolved galaxies from the SKA Observatory), considering weak lensing, angular clustering and their cross term (L × C) as observable probes. Cross-correlations of these effects are expected to provide promising information on the behaviour of these two observables, hopefully shedding light on beyond GR signatures. We perform a Fisher matrix analysis with the aim of constraining the {μ
0, η
0, Σ
0} parameters, either opening or keeping fixed the background parameters {w
0, w
a}. We find that, although lensing-only forecasts provide significantly unconstrained results, the combination with angular clustering and the cross-correlation of all three considered tracers (GW, IM, resolved galaxies) leads to interesting and competitive constraints. This offers a novel and alternative path to both multi-tracing opportunities for Cosmology and the Modified Gravity sector.
The 17th Siam Physics Congress : Carbon Neutrality (SPC2022)
Authors: Laosiritaworn Y , Aukkaravittayapun S , Tawkomnoy J , Soonthornthum B 
Published: February 2023

Abstract
The 17th Siam Physics Congress (SPC2022) was successfully held during 22-24 June 2022, co-hosted by the Thai Physics Society and the Suranaree University of Technology. Since the COVID-19 situation have been getting better, and to motivate more collaborative academic environment, the congress was organized to be a 100% on-site meeting at Khao Yai Convention Center (KYCC) in Nakhon Ratchasima (Thailand) during June 22-24, 2022.
List of Track, Organizing Committee, Scientific Committee, Plenary Speaker, Organizing Institutions, Sponsors are available in this Pdf.
Impact of solvent ratio on diphenyl oxalate chemiluminescence
Authors: Dangudom K , Khampa W , Boonyaras P 
Published: February 2023

Abstract
This research studied the effect of solvent ratio on chemiluminescence widely applied in glow sticks using dichloromethane and ethyl acetate as solvents. The fluorescent solution, as a mixture of diphenyl oxalate solvent and fluorescent dye rhodamine B, was stimulated by a 405 nanometre laser for fluorescent spectrum measurement before the chemiluminescence experiment. The fluorescent solution concentration and solvent ratio were varied. For the chemiluminescence experiment, diphenyl oxalate was dissolved in the solvents and combined with rhodamine B that interacted with a mixture of hydrogen peroxide and acetonitrile, resulting in chemiluminescence. The duration and intensity of light were measured by a photodiode detector. Results revealed that the concentration and solvent ratio of the fluorescent solution impacted the fluorescent spectrum due to opacity and solubility. Increasing ethyl acetate and decreasing dichloromethane gave a longer duration of light. The intensity of light in some ratios alternated high and low. Light emitted for a long time at high intensity is suitable for applications. Solvent ratios at 3:7 and 5:5 (1:1) gave better results than the other samples.
Assessment of radon concentration of vegetables and fruits in local markets in Muang Nakhon Phanom Municipality, Thailand
Authors: Pookamnerd Y , Atyotha V , Thopan P , Poochada W 
Published: February 2023

AbstractAim of this research is a hazards assessment of radon concentration and effective radium content were estimated in 24 vegetables and 9 fruits samples that were collected randomly from local markets in Muang Nakhon Phanom Municipality, Thailand by active detecting method (RAD 7). The results showed that radon concentrations in vegetables were in the range of 6.27 – 45.11 Bq/m3, the mean was 21.32±2.36 Bq/m3and radon concentrations in fruits were in the range of 12.11 – 53.19 Bq/m3, the mean was 27.47±2.81 Bq/m3, respectively. All values of radon concentrations for vegetable and fruits in these study were found to be well below than the international standard level of radon concentration 190 Bq/m3recommended by the EPA. These results were also used to calculate the average effective dose equivalent (EDE) of radium from vegetables and fruits, calculation was 0.034 µSv/y, this is lower than the effective dose equivalent for the standard value of 1.3 mSv/y recommended by the EPA. This study show that vegetables and fruits were found to be safe from radon contamination.
Electrolyte drink analysis by electronic tongue using carbon nanotube paste electrodes
Authors: Suh S H , Waritanant T , Wattanavichean N , Jityen A , Osotchan T 
Published: February 2023

Abstract
Electrolyte drink becomes very popular nowadays that drinking aid in rehydration which mostly contain water, sugar, and electrolytes (Na, K, Mg, Ca ions). In this work, several electrolyte drinks including M sport, M-plus, Sponsor, Sponsor citrus, Gatorade were analyzed by electronic tongue comparing to mineral and tap water. Non-specified electrode array used in electronic tongue was fabricated by mixing carbon nanotube with copper oxide or several types of metal-phthalocyanine (MPc) including MnPc, FePc, CoPc and ZnPc. The electronic tongue system was developed by using automatic electrochemical measurement setup with rotating eight beaker tray together with electrode holder slider in up and down position. This system was controlled by Arduino with developed python protocol. The cyclic voltammetry measurement indicated an ion current flow between electrodes with peaks in some cases. These cyclic graphs were converted to the specific line graphs for further analysis. Principle component analysis was used to classify the signal into several distingue groups. It was found that with the first two principal components, the mineral water and tap water can be totally separate from the other electrolyte drinks with total variation of about 77%.
Question-answer teaching method to develop student’s understanding of buoyant force
Authors: Chirayangyuenyong S , Emarat N , Arayathanitkul K 
Published: February 2023

Abstract
Many students do not understand that fluid pressure is the cause of the buoyant force. This work designed a process called question-answer teaching method to help improve this understanding. Sets of questions were developed which can be catagorized into three types: concept-guiding questions, comprehension-checking questions, and concept-applying questions. The major process of the method is that the instructor uses sets of the designed questions in class to encourage students and challenge their understanding. By expressing and discussing their ideas with peers and with the instructor, their misconceptions could be corrected, and the concepts could be understood by themselves. To prove if this teaching method is effective, a study was conducted with two groups of students: a control group (N = 88) and an experimental group (N = 12). A multiple-choice conceptual test was provided as pre-test and post-test. It was found that the results of the two groups are significantly different (p-value = 0.01). The normalized gain of the traditional group is 0.08 while that of the experimental group is much higher, at 0.63. Moreover, the students in the experimental group showed better understanding. They could conclude that the buoyant force results from the pressure difference in fluids.
Determination of phase change correction on gauge block measurement in two different interferometric measurement systems
Authors: Pringkasemchai A , Wongsaroj J , Mongkolsuttirat K 
Published: February 2023

Abstract
Phase change correction (PCC) is an important correction value of the end effect in an optical interferometry system. Normally, this value is used to compensate for gauge block measurement by an optical interferometry system based on ISO 3650:1998. Two different interferometric measurement systems in terms of fringe fraction measurement were performed to determine the phase change correction by a five-stacking method. These results are used to determine the length measurement of gauge blocks in an optical interferometer technique and consequently, to evaluate the uncertainty of gauge blocks measurement. The preliminary results for steel gauge block are shown that the value of phase change correction in a phase shift gauge block interferometer (PSGBI) system and a standard uncertainty are 35.2 nm and 5.8 nm, respectively. In contrast, the values from an average slits gauge block interferometer (ASGBI) system and a standard uncertainty are 66.0 nm and 6.0 nm, respectively. We found that the phase correction from the PSGBI system is lower than ASGBI about 0.53 - 0.56 times because the different of wave front correction in two interferometric systems. However, the lengths of gauge blocks of all materials measured by the two systems were consistent as assessed by En number. According to the study, we can conclude that phase change correction is based on the characteristics of each GBI system, surface texture characteristic in term of wringing condition and material types of gauge block and optical plates such as the fringe fraction measurement technique, and wave front error compensation. Consequently, measurements that require a high accuracy should determine the phase change correction before each measurement due to this value is not interchangeable.
A design of laser triangulation system with combined diffuse and specular reflection modes for dull and shiny surface measurements
Authors: Kerdkaew C , Kaewpho S , Srisakorn A , Chomkokard S , Yaemglin T , Cheowanish I , Jinuntuya N , Wongkokua W 
Published: February 2023

Abstract
Conventional laser triangulations are designed to measure the depth or height on a dull or rough surface. This can be done by projecting a light perpendicularly to the surface and capturing the spot of the diffuse reflection which is scattered from the surface. However, for a shiny or smooth surface, the specular reflection dominates, and it is difficult to detect diffuse reflection. We may modify the system setting to capture the specular reflection, with the cost of losing the diffuse reflection information. In this article, we proposed a design of dual diffuse and specular reflection mode of laser triangulation. The advantage is that there is no need to repeat alignment and calibration processes when we change the measuring mode, so we can easily select the measuring mode that is suitable for each surface. We have described the system setting and the calibration results where we can achieve the resolution of micrometre for both measuring modes.
The dynamics of pill millipedes’ flipping
Authors: Sirimachan P , Danphitsanuparn P , Sodadee R , Lakmuang T , Preechanukul N 
Published: February 2023

Abstract
This study aims to find an equation of motion that can describe the flipping motion of the pill millipede (Zephronia siamensis Hirst). From observation, the flipping motion can be characterized into four types. Moreover, the pill millipede’s shell curve that contacts the flat surface while flipping can be described as a form of the hyperbolic cosine function. Therefore, the equation of motion of flipping can be derived. From the geometry of the cross-section of the pill millipede, an angle between the vertical axis and the symmetry axis, a critical angle that allows it to flip, was obtained. Moreover, the maximum angle, the angle between its symmetry axis to the last point that hyperbolic cosine is fitted the shell’s curve, could be defined. We have found that the critical angle must be smaller than the maximum angle to provide a successful flipping with a minimal initial velocity. The equation of motion of flipping has been solved and tested by plotting the flipping angle as a function of time compared to the flipping angle from observation.
Modeling the navigation of a weaver ant in a simple, unfamiliar environment
Authors: Charoonratana L , Smith M F , Thiwatwaranikul T , Paisanpan P , Suksombat S 
Published: February 2023

Abstract
The ant species Oecophylla smaragdina, commonly known as the weaver ant, is native to tropical Asia and Africa. All ants are known for highly-organized, co-operative behavior and weaver ants are particularly adept at working together, in numbers, to accomplish large-scale tasks. Considered an example of a coherent many-body system, weaver ants have been studied by researchers in various fields. As a first step towards understanding weaver ant coordinated motion, we want to find the algorithm that a single ant employs for its own navigation. Having previously tracked the motion of individual ants within a small, bounded arena, we here present a simple theoretical model that can describe this motion. We show that their navigation can be adequately modeled as Brownian motion: the ant velocity changes by random impulses drawn independently from a robust probability distribution. Using established Brownian motion theory, we show that the ant’s tendency to remain near boundaries can be explained as a result of pure chance: having been stopped at the boundary, random motion is unlikely to bring the ant back to the arena interior. All qualitative aspects of ant motion are captured by a model with few parameters and without any assumptions about the ant’s intent. that an ant has preferences for position or velocity.
The smartphone and low-cost microcontroller as an AC circuit study kit for high school
Authors: Luangthongkham K , Krittinatham W , Unai S 
Published: February 2023

Abstract
This article presents a smartphone and a low-cost microcontroller-based AC circuit educational module focusing on the measurements of alternating voltage, frequency, and phase shift as well as learning about a phasor diagram. A smartphone provides a signal generator as a signal source, the ESP32 microcontroller works for signal acquisition and the beadboard RC series circuit is a test circuit. In-house developed software, based on Microsoft Visual Basic (VB), was used for monitoring the input signal like an oscilloscope. The measured frequency and phase shift agree with the results obtained from the commercial oscilloscope benchtop. This developed module is an apparatus that may be useful in online learning situations with the home experiment during the pandemic situation and used in high school that lacks the instruments, i.e., function generator and oscilloscope.
Investigation of plasma activated water in the growth of green microalgae (Chlorella spp.)
Authors: Silapasert P , Yatongchai C , Sarapirom S 
Published: February 2023

Abstract
The reactive oxygen nitrogen species (RONS) from plasma activation is intensively used in agriculture, particularly in the regulation of seeds germination and plants growth. It shows a promising effect on increasing the germination rate and promoting the growth of plants. This research employed plasma activated water (PAW) in cultivation of green algae (Chlorella spp.). The objective of this research was to introduce a comparison between the use of different fluids for cultivation of green microalgae. The experiment was carried out using cultivation of green microalgae in different fluids which were fertilized water, simulated-fertilized water, tap water, tap water treated with activated plasma for 2.5, 5.0 and 7.5 minutes. Samples of green microalgae were cultivated in these waters for 7 days. A comparative investigation was then conducted. It was found that nitrates remained constant at 10 mg/L on all treatment times, while the concentration of hydrogen peroxide considerably increased with the treatment time. According to the growth of green algae, a better result than simulated-fertilized water and tap water. This indicates an effect of RNS on promoting the growth of green algae. Upon completion of the test, the fertilized water showed the highest growth. However, a well-controlled plasma activation would make PAW possible for industrial uses in the future.
Influence of HCl-doping on physical, optical, and electrical properties of PEDOT:PSS films
Authors: Moungsrijun Sasimonton , Somsuk Suparat , Wongrerkdee Sawitree , Lohawet Khathawut , Sujinnapram Supphadate , Krobthong Sucheewan , Kaewprajak Anusit , Kumnorkaew Pisist , Wongrerkdee Sutthipoj 
Published: February 2023

Abstract
In this study, the preparation of HCl-doped PEDOT:PSS films was performed on fluorine-doped tin oxide substrates using spin coating method. The only SnO2 peaks were observed in the X-ray diffraction patterns. However, the functional groups that the FT-IR showed match with PEDOT and PSS. Contact angle measurement revealed that contact angle values increased for HCl-doped PEDOT:PSS films in comparison with undoped ones, which implies water tolerance improvement. In terms of optical transmittance, there were similar transmittance spectra for undoped and HCl-doped PEDOT:PSS films. Sheet resistance measurements exhibited that sheet resistance values decreased to the minimum values of 6.67 Ω/sq for HCl-doped PEDOT:PSS conditions. This indicates that the sheet resistance of PEDOT:PSS films can be reduced by HCl. Therefore, the HCl-doping could potentially be a suitable alternative for improving humidity tolerance and conductivity of PEDOT:PSS films.
Ab-initio study and atomistic spin model simulations of Cr2O3 thin films
Authors: Kunyangyuen Boonthum , Pinsook Udomsilp , Kittiwatanakul Salinporn 
Published: February 2023

Abstract
Magnetoelectric random access memory (MERAM) is the next generation technology of data storage with high-density and low power. Magnetoelectric material can be controlled by voltage such as an electric field to transform spin domain directions for storing data. One of the most promising materials that possess such properties near room temperature is Cr2O3. Although, the bulk has perfect properties for MERAM, it is necessary to fabricate thin films for applicable spintronic devices, i.e., reducing the required external control voltage; however, the film magnetic and physical properties might be different from bulk. In this work, we propose that the film properties might be induced by surface effects and are confirmed with Ab-initio calculation and atomistic spin simulation. The main simulation processes are the density functional theory (DFT) calculating, mapped with the classical Heisenberg model for exchange interaction constants up to the fifth nearest neighbour (J
1-J
5). The atomistic spin model was then used to approximate the Néel temperature (T
N), comparing two methods i.e., Monte Carlo simulation and the Landau–Lifshitz–Gilbert (LLG) equation. The Néel temperatures of the film were found to be slightly lower than the bulk, which is in good agreement with previous experiments. Furthermore, the spin dynamic model gives more correct result comparing to the Monte Carlo method.
External pressure effects on superfluid density of isotropic s-wave superconductors
Authors: Chanilkul G , Changjan A , Nilkamjon T , Udomsamuthirun P 
Published: February 2023

Abstract
Through using BCS theory and the semi-classical approach, the effect of external pressure on the superfluid density of s-wave isotropic superconductors were explored. The pressure parameters as the energy dispersion relation and the height of the density of state were applied. The analytical formula of superfluid density under pressure were derived and the numerical calculation results were compared to the experimental results of H3S and LaH10 superconductors. We discovered that the superfluid density under pressure of H3S and LaH10 superconductors fit our results closely. As the height of the density of state increased, so did the superfluid density.
Electronic and magnetic properties of MoTe2 monolayer doped with single and double transition metals: spin density functional theory
Authors: Thajitr Waritsara , Busayaporn Wutthikrai , Sukkabot Worasak 
Published: February 2023

Abstract
The spin density functional computations are exploited to determine the electronic and magnetic properties of MoTe2 monolayer doped with single and double transition metal atoms (V, Cr, Mn, Fe and Co). These properties are sensitive with the types and numbers of the doping transition metals. The semiconductors with narrow band gaps are shown in Cr and Co single-doped MoTe2 monolayer. V and Mn single-doped MoTe2 monolayer are metal. Fe single-doped MoTe2 monolayer reveals the half-metallic behaviours with a 100% spin polarization. V and Co provide the first-two lowest formation energies and are used for the co-doping studies. MoTe2 monolayers simultaneously doped with two Co are characterized as half metal, while the others are metal. The p-d and d-d hybridization around the Fermi level introduce the magnetism, called double exchange mechanism.
Physical properties and microstructure of traditional kaolin-based ceramics with additive fly–ash (FA)
Authors: Funsueb N , Thipboonraj A , Wannawek A , Pranamornkith P , Panthuwat W 
Published: February 2023

Abstract
In this research, the kaolin–based ceramic with 10-50 wt.% FA additive was fabricated by solid-state reaction. All powders were weighed, mixed and further milled by ball-milling for 4 h. All compositions of powders were uniaxial pressed in pellets and sintered at 1100 °C for 4 h. The XRD pattern of kaolin with FA additive showed that the kaolin phase was decreased with increasing FA and the single peak and the right shift resulted from the mix phase between quart phase and mullite phase of 40 to 50 wt.% FA. The SEM image of 10 to 30 wt.% FA addition illustrated melting grain and high roughness surface area. However, at the concentration of 40 to 50 wt.% FA addition provided the flat surface area and increased a porosity of the ceramics. The optimization of physical properties of ceramics included density, average linear shrinkage and hardness are 2.63 g/cm3, 24.62% and 135.32 kgf, respectively. The physical properties and microstructure of kaolin-based ceramics with FA additive are as the results of a structure properties relation.