bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of natural fiber ratio on mechanical properties of kaolin/fly–ash at low temperature ceramics
Authors: Panthuwat W , Thipboonraj A , Wannawek A , Pranamornkith P , Funsueb N 
Published: February 2023

Abstract
This study aims to increase the feasibility of ceramics at low temperature using natural fibers. The ceramics (Ce) were prepared by mixing a powder of kaolin and fly–ash at an equal ratio of 50:50 wt.%. The mixture was milled by ball–milling technique. The natural fibers ceramics (CeNF) were created by adding local pineapple leaves to kaolin and fly–ash powder. Scanning electron microscopy (SEM) was used to amorphous observation and particle size determination. The compositions of Ce and CeNF were investigated by using X–ray diffraction (XRD) technique. The mechanical properties of ceramics were determined by hardness and density test. The results showed that the grinding of kaolin and fly–ash for 4 h produced the highest strength Ce. For the addition of local pineapple leaves at 2 wt.%, the strength could be increased from 92.9 kgf to 118.3 kgf.
Effect of self–assembled iron–tannic nanoparticles on the fastness and antibacterial properties of natural indigo dyed polyester cotton blended fabrics from Strobilanthes cusia (Nees) Kuntze
Authors: Keereeta Y , Srithong S , Pranamornkith P , Tharawatchruk W , Boonsom K , Klinbumrung A , Kaowphong S 
Published: February 2023

Abstract
In this study, self–assembled iron (III)–tannic nanoparticles (Fe–TA NPs) were synthesized at room temperature using a simple, low–cost, and reproducible method. The interaction between Fe3+ and TA, and the particle size of Fe–TA NPs with different mole ratios of ferric chloride and tannic acid were characterized by UV–vis spectroscopy and dynamic light scattering (DLS). The modified fabrics were fabricated by one–step depositing Fe–TA NPs onto the surface of natural indigo dyed polyester cotton blended fabrics using the exhaustion dyeing process. SEM, FTIR, Raman spectroscopy, and TGA were used to investigate the surface morphology, chemical structure, and thermal stability of the modified fabrics. According to the results, indigo–dyed fabrics treated with Fe–TA NPs showed an excellent antibacterial activity against both gram–negative (E. coli) and gram–positive (S. aureus) bacteria, improving of thermal stability, light fastness acceptance, washing fastness, and color fastness to heat.
Synthesis and application of nickel compound quantum dots by electrochemical process
Authors: Phimsarn Prapasiri , Panyathip Rangsan , Hongsith Kritsada , Sucharitakul Sukrit , Phadungdhitidhada Surachet , Choopun Supab 
Published: February 2023

Abstract
In this work, nickel compound quantum dots (Ni-QDs) are synthesized by the electrochemical process. The electrochemical process known as a facile method is used to prepare Ni-QDs colloid solution. Ni-QDs are synthesized using nickel-metal rods dipped into an electrolyte solution of potassium chloride and citric acid at 0.4M and 0.1M concentrations, respectively, then applied voltages at 1, 3, and 6 V at various synthesis times for the synthesis process. As a result, Ni-QDs are characterized for size by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The absorption spectra of Ni-QDs are indicated via ultraviolet-visible spectroscopy (UV-vis) at 390, 655, and 731 nm of wavelengths, which can be assigned to absorption peaks of Ni (OH)2 and NiCl2, respectively. The crystalline structure and photoluminescence properties of Ni-QDs are examined with selected area electron diffraction (SAED) and photoluminescence spectroscopy. It is found that the Ni-QDs growth rate can be controlled by the various voltages applied in the synthesis process. The smallest size of Ni-QDs is achieved with the low voltage applied (1V) at 6 hrs, while the higher voltage process produced a strong chemical reaction resulting in the lower yield of Ni-QDs due to the large particles of the obtained products. Thus, the Ni-QDs at 1V condition is considered the optimum condition, indicating the smallest hydrodynamic size (187±1.43 nm) and revealing the high stability of Ni-QDs dispersed in solution, as shown in the homogeneous solution compared to Ni- QDs in other conditions. Consequently, the influence of voltage and synthesis time in the synthesis of Ni-QDs is important to optimize the quality of Ni-QDs.
Enhancement of Perovskite solar cells performance using electrochemically grown TiO2 quantum dots
Authors: Sintiam Thanakrit , Saranrom Natpapon , Phadungdhitidhada Surachet , Choopun Supab , Sucharitakul Sukrit 
Published: February 2023

Abstract
Perovskite solar cells (PSCs) have been at the center of attention for research and development of clean energy technology. The platform promises high performance with relatively cheap and low-temperature processing. The main hindrance of the platform is low stability and performance degradation due to humidity. Most defects and degradation often stem from interfaces between the perovskite layer (PSVK) and carrier transporting layer. This work aimed to solve such an issue by improving the interface between the Perovskite layer (PSVK) and electron transporting layer (ETL) made of titanium in the Perovskite solution. That is methylammonium formamidinium lead iodide (FA0.3MA0.7PbI3) PSCs using electrochemical grown TiO2 quantum dots (QDs) mixed in Titanium tetraisopropoxide (TTIP). TiO2 QDs have grown electrochemically in potassium chloride (KCl) solution and then mixed in TTIP with various concentrations (0%, 2.5%, 5.0%, 7.5%, and 10%). The photoconversion efficiency (PCE) of PSCs was improved to 14.05 % while 7.5% of TiO2 QDs passivation with the champion performance of 15.72% (a significant improvement from the 0% standard condition). The PSCs also lasted over 200 hours, demonstrating increased stability with the proposed recipe. This work demonstrated the successful delivery of alkaline passivation using TiO2 QDs as an agent for improving PSCs.
Effect of annealing conditions on VO2 thin films prepared by sol-gel method
Authors: Panburana Pongsatorn , Chatraphorn Sojiphong , Kittiwatanakul Salinporn 
Published: February 2023

Abstract
Vanadium dioxide has attracted considerable attention because of the semiconductor-metal transition at 68 °C. This reversible transition changes crystal structure from monoclinic to rutile resulting in tremendously change of transmittance and reflectance of infrared wavelength and electrical resistance making VO2 thin film potential candidate for energy-saving smart windows—automatically block heat. However, the preparation is very challenging due to the multivalence of vanadium element. In this study, we explored different annealing conditions for thin films synthesized by sol-gel method which has advantage over other methods such as lower cost, simpler process, and ability to make large scale thin films. In the experiment, vanadium (V) triisopropoxy oxide (VO(OC3H7)3) was used as precursor. The annealing conditions explored are annealing temperature and annealing time of thin films in argon rich environment. The spin-coated films were annealed at 300-500 °C for 30 minutes, while another set was annealed at 450 °C for 30, 60, 90, and 120 minutes, respectively. Then the films were characterized with Raman spectroscopy and temperature dependent resistance measurement. The results show that the longer the annealing time and the higher the annealing temperature are better for film formation—closer to VO2 (higher V:O ratio). In addition, the effect of various substrate types was also explored, another set of thin films was coated on c-plane sapphire (c-Al2O3) and soda lime glass (mostly SiO2) to compare the effect. Then the films were characterized with Raman spectroscopy and X-Ray Diffraction (XRD). The result showed that sapphire substrate yielded better film formation.
Gamma irradiation assisted nickel impregnation on activated carbon derived from water hyacinth for electrocatalyst application
Authors: Tonkaew Piyapat , Deechakawan Nicharee , Kanjanakosit Nichawadee , Chanta-urai Treepat , Kwamman Tanagorn , Chutimasakul Threeraphat , Anantachaisilp Suranan 
Published: February 2023

Abstract
Water hyacinth (WH) is an invasive floating plant causing water pollution. However, its leaves contain a high cellulose content, which can be used as biomass to synthesize activated carbon. Thus, in this study, water hyacinth was subjected to the KOH activation process to obtain water hyacinth-based activated carbon (WH/AC). Moreover, as a novel method for nickel impregnation, gamma irradiation was proposed as an alternative to replacing the traditional method due to its high penetration power and energy. To obtain the optimal condition for nickel impregnation, different absorbed doses of gamma-ray (0, 20, 100 kGy) were applied to commercial activated carbon (AC), represented as 0-AC, 20-AC, and 100-AC, respectively. These samples were thoroughly characterized with BET, SEM-EDS, XRD, FTIR, and XPS. The BET surface area of commercial activated carbon increases as the absorbed dose of gamma-ray increases. The SEM images revealed that the surface morphology of the commercial activated carbon significantly changed, becoming more spherical in structure, and distributed after gamma irradiation. As a result, the optimal absorbed dose for nickel impregnation is 20 kGy. Thus, the 20 kGy absorbed dose of gamma-ray was carried out in WH/AC, yielding 20-WH/AC. From the XPS results, 20-WH/AC has a more incredible amount of nickel deposited on the surface. The activated carbon electrocatalysts were investigated for applying electrochemical carbon dioxide reduction reaction (CO2RR) by linear sweep voltammetry (LSV). Interestingly, 20-WH/AC electrocatalyst exhibited the highest CO2RR efficiency compared to others. All results indicate that water hyacinth can potentially be utilized as a raw material in producing nickel-impregnated activated carbon irradiated with gamma rays.
Systematic investigation and correction of the magnetic hysteresis obtained by vibrating sample magnetometry
Authors: Santikulthani S , Eknapakul T , Pinitsoontorn S , Songsiriritthigul P 
Published: February 2023

Abstract
This work focused on a systematic study of data corrections for the vibrating sample magnetometry (VSM) to obtain reliable magnetic properties of strong ferromagnets. We designed the systematic experiments by varying the length-to-radius ratio of VSM samples between 1-5 and provided the step-by-step corrections of two commercial NdFeB powder magnets with reported energy product ((BH)max
) of 6.0±0.5 and 12.7±0.5 MGOe. Without data corrections, the measured hysteresis loops yield the (BH)max
between 47.3% and 62.6% of their reported values with improper values of saturation magnetization (Ms
), remnant magnetization (Mr
), and Mr/Ms
ratio. To correct the measured VSM hysteresis loop, firstly, the paramagnetic-like slope of 0.0500–0.0735 G/Oe was subtracted until the flat at high fields was obtained. Then, up to 6% of magnetization value and demagnetizing factor (N) of 0.30-0.53 was applied to achieve similar hysteresis loops for all samples. The corrected (BH)max
after all processes is around 86-95% of the reported value. Moreover, by examining the samples with different packing densities, it was found that the loose-packed samples exhibit hysteresis distortion, which could be caused by an unwanted magnetostatic interaction and degree of particle rotation of the powder.
Effect of Mn grinding time on structural, chemical, and magnetic properties of the Manganese Bismuth prepared by sintering in vacuum
Authors: Ngamsomrit S , Eknapakul T , Pinitsoontorn S , Songsiriritthigul P 
Published: February 2023

Abstract
This work reports the changes in structural, chemical, and magnetic properties of the low-temperature phase manganese bismuth (LTP-MnBi) sintered from mixtures of Bi and Mn ball-milled for different times. The milling time was varied from 1 to 15 hr to produce Mn powder with different particle sizes. The average particle size reduced from ~400 µm (original size) to 35 ± 5 µm and 6 ± 2 µm after 1 and 15 hr milling times, respectively. The LTP-MnBi powder was sintered at 275 °C at vacuum pressure below 5 × 10−7 mbar for 12 hours. By increasing the Mn grinding time, the maximum energy product ((BH)max) of LTP-MnBi decreased from 1.98 ± 0.05 to 1.59 ± 0.07 MGOe, and the saturation magnetization (M
s) decreased from 53.42 ± 0.90 to 44.32 ± 0.72 emu/g. The x-ray diffraction patterns indicated the reduction of LTP-MnBi content as a function of the milling time, which is agreed with the decrease in the M
s value. This is supported by the x-ray photoelectron results, which also showed the increment of Mn oxides on the surface as a function of Mn milling time. The unexpected decrease in M
s, which results in a significant reduction of magnetic performance, might be due to the presence of the oxides preventing diffusion during sintering.
Theoretical study of electrical transport across 1D ferromagnet-insulator-ferromagnet junction in small applied field
Authors: Butraburi Adithep , Nakhonthong Natthagrittha , Pairor Puangratana 
Published: February 2023

Abstract
We theoretically investigated how the insulating band gap, the thickness of the insulating layer, and the external field affect the electric transport through a ferromagnetic metal-insulator-ferromagnetic metal junction. Applying the Slonczewski model with the inclusion of a small external field, we calculated the magnetoresistance ratio (MR) and found that the increase in both the insulating band gap and the thickness boost MR. MR is also increased with the magnetic field. Our model indicates that MR reaches a maximum value at a particular strength of the applied field that depends on the thickness of insulating layer.
Design and simulation of a low-energy single ion irradiation system for micro/nano-biosample investigation
Authors: Thopan P , Atyotha V , Prakrajang K , Tippawan U , Yu L D 
Published: February 2023

Abstract
A low-energy single ion irradiation system is developed in its initiation in Thailand to follow one of the trends in novel ion beam technology exploitation. Single ion irradiation of materials is a highly technological development of ion beam technology. The developed single ion irradiation systems worldwide are primarily in the MeV-energy range and for single cell studies, and recently the trend has been extended to the low-energy range (< 100 keV) but focused on microelectronic applications. Based on our previous research on low-energy ion beam irradiation of biological cells and DNA, we design and simulate a low-energy single ion implantation system, aiming at eventual construction of such a novel ion beam apparatus for applications to the biological studies. In the system, the ion energy is decreased to orders < 1 keV by the existing deceleration lens, then the low-energy ion beam passes through µm slits, and finally, low-energy single ions are obtained by beam scanning with appropriate frequencies from scanner plates and detected by a single ion detection device. Conceptual design, calculation and simulation of this single ion system are presented.
Optimization for fuel loading and reactivity initiated accident analysis for TRR-1/M1
Authors: Tiyapun K , Wetchagarun S 
Published: February 2023

Abstract
TRR-1/M1 reactor core consists of two types of standard TRIGA fuel, 8.5% and 20% weight uranium. Periodically, the reactor core configuration is rearranged in order to optimize its performance. The objective of this work is to show that it is safe to operate TRR-1/M1 at 1 MW steady state condition for the new core configurations of which the 8.5% weight fuels in the B ring are replaced by high burn up 20% weight fuel elements. To ensure sufficient safety margins of the reactor operation, thermal–hydraulic computer codes, i.e., COOLOD-N2 and EUREKA-2/RR, were coupled with neutronic calculation based on Monte Carlo N-Particle Transport concept in order to analyse some crucial operating parameters, e.g., coolant and fuel temperature in the reactor core as well as Departure from Nucleate Boiling Ratio (DNBR) along the fuel axial direction of the hottest channel. From this study, it can be concluded that no significant effect on the reactor operation was found when replacing the 8.5% weight fuel elements in the B ring with the high burnup 20% weight fuels. Transient phenomena of Reactivity Initiated Accident (RIA) were also performed for the rapid removal of a sample from the reactor core with reactivity insertion rate of $1.00/s. It is found that the negative temperature coefficient of TRIGA fuel provided safety for the reactor even during the prescribed reactor transients. The calculation showed slightly increase in the fuel temperature during the short period of reactivity insertion which caused insignificant energy release to heat up the fuel during the accident. The maximum fuel temperature found during the accident in this study was well below TRR-1/M1 safety.
Period variation of an eclipsing binary system BQ Ari
Authors: Rattanamala R , Komonjinda S , Awiphan S , Wutsang S , Sappankum P , Deesuan L 
Published: February 2023

Abstract
This study was aimed to study the period variation of the eclipsing binary BQ Ari. The system was observed from Thai Robotic Telescope at Spring Brook Observatory (TRT-SBO) between 2019 and 2020, Regional Observatory for Public, Chachoengsao (ROP-CCO) in 2021, and Transiting Exoplanet Survey Satellite (TESS) in Sector 42 and 43. The data obtained were used to create the light curves in each wavelength and compute the times of minima. As the result, we receive 311 time of minima. We combined the time of minima from the previously published with our values to calculate the O − C diagram. The O − C diagram shown the period variation with a period about 6-8 years and amplitude about 0.0020 days. The possibility of the period variation of BQ Ari may be due to the third body component with the mass of 0.0948 M
⊙ (M dwarf) and the orbital separation (a
3sini) around 3.96 AU.
Memorization and prediction capability of the interacting phase oscillators
Authors: Kumpeerakij Chanin 
Published: February 2023

Abstract
Nonlinear dynamical systems, such as well-tuned recurrent neural networks, have proved a powerful tool for modeling temporal data. However, tuning such models to achieve optimal performance remains an outstanding challenge, not least because of the complex behaviors that emerge from interacting microscopic constituents. Here, we consider a minimal model of two interacting phase oscillators coupled to a thermal bath and driven by a common signal. We quantify the memory and predictive capability of the system with the mutual information between the phases of oscillators and the signals at different times. We show that the interaction between oscillators can increase the information between the system and the movement. We attribute this behavior to an increase in the effective signal-to-noise ratio, resulting from a stronger correlation between the oscillators. We also demonstrate that heterogeneity in the natural frequencies of the oscillators can further increase the mutual information though more efficient uses of oscillator states.Our work offers the first step toward a systematic approach to optimizing interacting nonlinear dynamical systems for memorizing and predicting temporal patterns.
Photometric variability of high amplitude δ Scuti stars using AAVSO international database: V2455 Cyg and GP And
Authors: Chehlaeh N , Masae N 
Published: February 2023

Abstract
This research aims to study photometric variability and Fourier analysis of high amplitude δ Scuti stars (HADS), which are interesting short-period variable stars with spectral types between A2V and F0V. They are located in the area of the classical cepheid instability strip, which crosses the main-sequence (MS) on the Hertzsprung-Russell (H-R) diagram. The CCD photometric V-magnitude data of the selected HADS stars were acquired based on the AAVSO international database (American Association of Variable Stars Observers), which is the most comprehensive digital variable star database. Two interesting targets V2455 Cyg and GP And were selected for the study. The discrete Fourier transformation was used to analyze time-series light curves. The pulsating properties of the selected HADS stars were analyzed using the Period04 astronomical program. We obtained each star’s times of new light maxima, magnitude changes, and pulsation frequencies. The main frequency of V2245 Cyg was determined to be 10.614995 ± 0.000002 d−1 and the main frequency of GP And is 12.709253 ± 0.000001 d−1. V2245 Cyg and GP And are high amplitude δ Scuti stars. The study of the pulsation frequencies and period change of HADS stars can estimate their pulsation modes and their evolution. Moreover, HADS stars are very important as standard candles that can be used to measure galactic distances.
Simulating AGN feedback and its evolution in galaxy mergers: case study for NGC 5252
Authors: Boonmalai M , Sawangwit U , Wannawichian S 
Published: February 2023

AbstractWe are investigating the evolution of merging galaxies using numerical simulations. This research focuses on the AGN-driven feedback mechanism that can be responsible for the outflow gas found on kiloparsecs scales in Seyfert galaxies. The initial conditions of the galaxy were designed to replicate the observable characteristics of NGC 5252. NGC 5252 is an off-nucleus ultraluminous X-ray (ULX) source and has extended [OIII] emission up to 10 kpc scales. The optical spectrum properties of CXO J133815.6+043255 are comparable to those of Low-Luminosity AGNs (LLAGNs). Observations of high angular resolution very long baseline interferometry (VLBI) also showed that it is a suitable option for a dual radio-emitting AGN system. Moreover, the NGC 5252 off-nucleus component is thought to be a stripped leftover of a merging dwarf galaxy. The supermassive black hole (SMBH) physics module is used in smoothed-particle hydrodynamics (SPH) simulations of merging galaxies using the GIZMO code to investigate the evolutionary changes of such a system. Our major-merger test run could not produce the observed morphology contrary to a report that one would be able to produce a spiral galaxy. The minor-merger test run up to around 0.2-0.3 Gyr shows a promising early result of the final system however further works will be conducted to investigate the properties of the resulting double AGN system and its evolution.
Study of imaging system in proton computed tomography with data acquisition from a monolithic active pixel sensor
Authors: Ratsuntia N , Songmunnak A , Ritjoho N , Sanghangthum T , Kobdaj C 
Published: February 2023

Abstract
The first proton therapy system in Thailand has been installed at King Chulalongkorn Memorial Hospital (KCMH) since 2019. Apart from its clinical usage, Suranaree University of Technology (SUT) has initiated the collaborative research work with KCMH to explore a possibility of developing a proton computed tomography (pCT) prototype. Due to the proton’s depth-dose properties, this technique is more effective than photon treatment. Prior to proton therapy, pCT could help with the treatment planning. This technique simplifies proton treatment calculations since both processes involve the same particle interaction with matter. We simulated the experiment setup using G4beamline with the proton beam using a monolithic active pixel sensor (MAPS) as a proton tracker. The sensor’s output revealed that the ratio of data from protons interacting on the sensor was low, so we pre-processed the data with MATLAB by applying a mean filter to replace any empty pixels with the average of their nearby pixels. A 3D reconstruction was performed by stacking all the axial images reconstructed by the back projection method. The result shows that the material densities of reconstructed samples can be identified, however, it is still in the preliminary stage and not yet suitable for clinical trials. It is, however, possible to improve the quality of images and obtain a better 3D reconstruction for the pCT prototype by using a back-projection method.