bluuebunny/crossref_metadata_2025_split huggingface dataset:
Present status of 4 MeV electron beam accelerator system for natural rubber irradiation
Authors: Suphakul S , Rhodes M W , Saisut J , Rimjaem S , Thongbai C 
Published: December 2019

Abstract
Electron beam accelerator system for natural rubber irradiation is under developing at the Plasma and Beam Physics (PBP) Research Facility, Chiang Mai University (CMU). The system aims to improve the natural rubber latex properties by using energetic electrons to induce cross-linking between polymer chain or called vulcanization process. Due to no chemical added as a conventional way (usually sulphur), the rubber product produced by this method has good mechanical properties with lower toxicity that is suitable for many applications. The system consists of a DC thermionic cathode electron gun, a 5-cell radio-frequency (RF) linear accelerator (linac), an RF modulator, an adjustable speed conveyer and a control system. The expected electron beam energy from the simulation is in the range from 0.5 to 4 MeV with a maximum pulse current of 100 mA and a pulse repetition rate is adjustable from 20 to 400 Hz. This beam condition provides a calculated average absorbed dose between 160 and 640 Gy. The system has been complete assembled and the RF modulator has been tested. The RF processing has been performed and some of electron beam properties has been measured. The present status of development and the results are reported in this contribution.
Calibration of energy slits and simulation of electron trajectories in the alpha magnet’s 3D field
Authors: Techakaew K , Rimjeam S 
Published: December 2019

Abstract
At the PBP-CMU Electron Linac Laboratory, high-brightness electron beams are produced from the radio-frequency (RF) linear accelerator (linac) system that consists of a thermionic RF electron gun, an alpha magnet, a traveling-wave linac structure, quadrupole magnets and steering coils. Several diagnostic devices are installed in the accelerator system to characterize electron beam properties. In this work, we study on measurement of electron beam energy downstream the RF gun using the alpha magnet equipped with energy slits in the vacuum chamber and a current transformer. Calibration of the energy slits’ posit ions for various stepper motor encoder numbers was conducted before installing the slits in the magnet’s vacuum chamber. The calibration result was imported into the energy calculation software that links to the stepper motor encoder and the energy value will then be automatically calculated. Moreover, dynamic simulations using a software ASTRA were performed to investigate electron’s trajectories in the alpha magnet’s field with different initial electron positions and angles. The results from this study will be used to estimate the result and accuracy of energy measurement using the alpha magnet. It was found that, for different initial horizontal and vertical positions at the alpha magnet entrance, the energy of electron will be measured to be lower than its actual energy by around 0.5% and the measured energy will decrease when the initial position is moving away from the middle point. In case of horizontal particle’s angle, the error of energy measurement increases up to 1% at the angle of 3° before the beam hitting the alpha magnet chamber. For the vertical particle’s angle, the electron that has the initial angle less than or larger than 1.5° will hit the vacuum chamber.
Heat transfer rate of close-loop oscillating heat pipe with check valve using NiO as working fluid
Authors: Saengmart O , Meena P 
Published: December 2019

Abstract
This Research studied the heat transfer characteristics of the closed-looped oscillating heat pipe with check valves (CLOHP/CV), examining effectiveness, considering the effects of heat transfer rates and studying the internal pressure of the (CLOHP/CV). That install the fins and do not install the fins by using a heat pipe made of copper pipe, inner diameter of 5 mm, with two check valves. The evaporator section, condenser section and adiabatic section lengths were 20, 20 and 10 cm, respectively. Heat pipe had two check valves and 24 turns. Nickel oxide (NiO) was used at a working filling ratio and concentration 50% by volume and 0.14 g of the tube respectively. Hot air was at 60 70 and 80 degree Celsius, at a wind speed of 1.0 m/s. The fins were copper with radian size of 0.5 cm, and thickness of the fins was 1 mm. From the experiment, it was found that the heat flux of the CLOHP/CV heat exchanger set with the fins was the highest at 80 degree Celsius, with a value of 9, 743.11 W/m2. The effectiveness is 0.3 and the internal pressure is 123.59 kPa.
Experimental apparatus and methods for synthesizing 1D single-atom array
Authors: Srakaew K , Phrompao J , Anukool W 
Published: December 2019

Abstract
We present apparatus and methods for laser cooling and trapping of single rubidium-85 atoms. The setup consists of a magneto-optical trap and identical optical microtraps lined up by using a programmable acousto-optic defector. The apparatus designs and systematic arrangement are described in conjunction with the limitations of the techniques and the scope for future improvement. Individual control over the position and power of each trap attained in our work is the key to addressable and scalable quantum system.
Development of a highly sensitive label-free DNA based fluorescent sensor for cisplatin detection
Authors: Niammusik Anusorn , Thammakhet-Buranachai Chongdee , Thavarungkul Panote , Kanatharana Proespichaya , Srisintorn Wisarut , Buranachai Chittanon 
Published: December 2019

Abstract
Cisplatin, or cis-diamminedichloroplatinum (II), is a platinum-based chemotherapeutic drug. It is widely used against many types of cancer. However, there are various side effects in patients taking cisplatin. The side effects are also found in chemotherapists or health workers exposed to contaminating cisplatin in workplace. Therefore, there is a need for sensors for cisplatin contamination detection. This work reports the development of a highly sensitive fluorescent sensor using single stranded ssDNA as a sensing element. It contains consecutive guanine bases to allow an efficient cisplatin binding. Then, an enzyme-free DNA amplification technique called catalyzed hairpin assembly (CHA) was employed to increase the sensor sensitivity. It comprises two hairpin DNAs (H1 and H2) which are in meta-stable states and can form a hybrid only in the presence of the cisplatin sensing ssDNA described above. H1 is designed such that after the hybrid formation, a newly exposed overhang forms a G-quadruplex (GQ). The GQ formation can be monitored by mixing a GQ binding dye called Thioflavin T (ThT) in the solution. ThT fluorescence quantum yield is negligible if ThT is free in solution but increases over 1000 folds when bound to GQ. The formation of H1:H2 hybrid and ThT-GQ complex is disrupted if cisplatin binds to the sensing ssDNA. Therefore, the decrease in ThT fluorescence signifies the increase in cisplatin concentration and vice versa. The developed sensor capable to detect the cisplatin in the range of 500 – 7500 nM and the limit of detection is 182 nM. The merit of this novel sensor is that it is label-free therefore economical yet highly sensitive. It is expected that the sensor can help monitor cisplatin contamination in chemotherapeutic workplaces.
Characterizations of carbon nanotubes grown on clay
Authors: Aodkeng S , Sinthupinyo S , Chamnankid B , Hanpongpun W , Chaipanich A 
Published: December 2019

Abstract
Carbon nanotubes (CNTs) are nano materials that have unique physical and mechanical properties. Carbon nanotubes grown on clay (Clay-CNTs) are new hybrid material based on clay mineral. Clay minerals were used as catalyst for CNTs synthesis by chemical vapor deposition at 700 °C for 1 hour. In this work, Clay-CNTs were investigated by various analytical techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM) and electron diffraction spectrometer (EDS) and Raman spectroscopy to analyse the phase identification of crystalline, morphology and crystallinity quality of Clay-CNTs. Moreover, thermogravimetric analysis (TG) was studied to ident ify phase deco mposition. XRD results indicate crystallites of the CNTs have (002), (101) and kaolinite and quartz from clay mineral catalyst. SEM images of Clay-CNTs showed cluster of CNTs on carbon fiber and their wormlike morphology. The intensity of Raman spectra of Clay-CNTs reveals the defect of CNTs structure. TGA derivative profile indicated decomposition of CNTs and kaolin.
Mechanical and physical properties of particleboard made from scirpus grossus and coconut fiber
Authors: Kongkaew P , Sila W , Saiying S , Pharanat W 
Published: December 2019

Abstract
In this research of study mechanical and physical properties of particleboard made with scirpus grossus and coconut fiber. The particles were manually mixed at a weight ratio of C1 (100:0), C2 (90:10), C3 (75:25), C4 (25:75), C5 (10:90) and C6 (0:100) and glued adhesive with methylene diphenyl diisocyanate (MDI) 7% (by weight). Physical and mechanical properties were evaluated following Thai industrail standard (876-2547). To measure the mechanical properties, 6 samples were tested to determine the modulus ofrupture – MOR and modulus of elasticity – MOE by using samples with a nominal size of 250×50 mm and physical properties, 3 samples were tested to determine the were determined: density, water absorption (WA) and thickness swelling (TS). The physical properties result of all ratio is according to the standard, which the highest density, thickness swelling and water absorption are C3 (849.01 kg/m3), C6 (6.55 %) and C6 (9.92 %) respectively. The mechanical properties result of Modulus of rupture (MOR) for proportion to C4, C5 and C6 have a higher than standard, while C1, C2 and C3 are lower. All ratio for modulus of elastic (MOE) are lower than standard. The ratio of C6 is the highest modulus of rupture (21.60 MPa) and the highest of modulus of elastic is C1 (360.20 MPa). The experimental investigation indicated that the excellent particleboard properties are obtained with a mixture ratio of C5 (10:90).
Training science teachers in using guided inquiry-based learning to develop experimental design skills in laboratories
Authors: Sujarittham T , Yeung A , Tanamatayarat J 
Published: December 2019

Abstract
It is well accepted that the purpose of physics laboratory classes is to not only help students gain an understanding of physics concepts, but to also help them develop their scientific laboratory skills. One such skill is the ability to undertake science inquiry to design an experiment to investigate a research question, thereby enhancing students’ higher order thinking skills. Engaging in science inquiry and experimental design consists of five sub-skills. These include identifying the variables to be measured, developing an experimental procedure, selecting equipment and materials, minimizing possible errors, and making links to known physics concepts. The aim of this study was to train teachers to enhance their students’ experimental design skills through inquiry based learning. A training program was conducted, in which 22 teachers participated. These teachers had over 5 years’ experience in teaching science and physics. The concept of heat capacity was chosen, as it was of interest to all the teachers in the group. The training also involved teachers using guided worksheets, which were designed to help them assist their students in developing each of the five sub-skills using a guided inquiry approach. It is expected that such an approach will allow students to solve problems that they had encountered previously. From observations of teacher practices and analysis of teacher worksheets completed in the training course, we found that most teachers spent most time on linking physics knowledge to solve the problem. Many teachers had misconceptions about heat transfer and closed system. Only 6 teachers could design and conduct their experiment to solve the problem correctly. However, all of them could reflect that the need for designing experiments that can enhance students’ experimental design skills and the five sub-skills.
A period-based measurement for grounding capacitance meter with arduino using a relaxation oscillator
Authors: Gasosoth Thitinun , Lianghiranthaworn Traitot , Unai Somrit 
Published: December 2019

Abstract
This paper focus on the development of a simple and low-cost capacitance measurement for Arduino microcontroller. The working principle of the circuit is based on the period changes of the square-wave signal, which is generated by relaxation oscillator, causes by RC values in the circuit. The relaxation oscillator is based on two different types of op-amp, rail-to-rail and comparator. The output frequency of the oscillator is about 2 kHz to 100 kHz. The range of test capacitors is approximately from 1 pF to 33 pF. The percent error of each type of op-amp due to nonlinearity and parasitic capacitance is presented. Finally, the comparison of the experimental results and theoretical analysis as well as precision LCR meter are investigated and discussed.
L-Cysteine/Graphene oxide for electrochemical determination of ascorbic acid in the presence of dopamine and uric acid
Authors: Prongmanee W , Asanithi P 
Published: December 2019

Abstract
Ascorbic acid (AA), also known as vitamin C, has many roles in biological systems, such as prevention of cancer and common cold. Determination of AA is essential for food and pharmaceutical industries. Nowadays, electrochemical method is a potential method for detecting AA. However, detection of AA in presence of biological compounds, e.g. dopamine (DA) and uric acid (UA), is big challenge because these compounds are commonly found in biological samples and interfere the oxidation peak potential of AA. To overcome this problem, electrochemical coating of cysteine on graphene oxide decorated screen-printed electrode (Cys/GO/SP) was newly used for determination of AA. Field emission scanning electron microscope, energy dispersive x-ray and EIS were used to characterize the composites. AA of different concentrations were determined in phosphate buffer saline that has 10-µM DA and 10-µM UA using by differential pulse voltammetry (DPV). Cys/GO/SP presented three oxidation peaks corresponding to AA, DA and UA, whereas GO/SP and SP provided single peak. The oxidation peak currents of AA showed good linear relationship with AA concentrations of 0.5 - 5 mM with the detection limit of 0.26 mM. The results suggest that Cys/GO/SP can be used for electrochemical determination of AA in the interference of DA and UA.
Thai Hom Mali rice purity test by using digital image analysis
Authors: Kleawphaipan T , Somprasong S , Srahongthong T , Pattanasiri B 
Published: December 2019

Abstract
The mixing of non-aromatic rice is one of the major problems that impact directly to Thai Hom Mali Rice export markets. Thus, to preserve the Thai Hom Mali Rice quality and reputation of exporting, the National Bureau of Agricultural Commodity and Food Standards (ACFS) establishes a manual of Thai Hom Mali Rice standards, where the rice grain must have at least 92% of Thai Hom Mali. Nowadays, the DNA-based method has been proved to be a robust and accurate tool for testing rice purity. However, this adulterants detection technique is expensive and unfit for a small scale of commercial. In this work, we applied image analysis by using the computer together with a flatbed scanner to characterize the rice grain and classify different rice varieties. We found that some rice grain morphological features, such as chaff-tip width, right concave depth, chaff-tip angle, and interior angle, are possible to be used for distinguishing between Khao Dawk Mali 105, Chainat 1, Pathum Thani 1, and RD 23.
Simulation and measurement of electromagnetic undulator prototype for production of THz radiation
Authors: Kitisri P , Suphakul S , Thongbai C , Rimjaem S 
Published: December 2019

Abstract
This research focused on magnetic field simulation and measurement of an electromagnetic undulator prototype for generation of terahertz (THz) radiation from electron beam with energy of about 10 MeV at the PBP-CMU Electron Linac Laboratory of the Plasma and Beam Physics Research Facility. This undulator prototype has 6.5 periods with a period length of 64 mm. Its magnetic field was measured by using a Hall probe with a measuring system, which its position movement can be precisely controlled with automatic computer interface. The magnetic field of end-poles was compensated by adjusting the end-pole currents. It was found that at the main-pole current of 0.76 A, the optimal end-pole currents at the entrance and exit o f the undulator were 0.27 A and 0.19 A, respectively. At these currents the undulator has the transverse good field region of 19 mm. For magnetic field simulation, the computer program RADIA was used to model the undulator prototype for the ideal design. This was done for comparing the magnetic fields from the simulation and the measurement. The magnetic field of the two cases were not the same because the constructed prototype has different gaps for different lo ngitudinal positions. However, they could give the radiation in the THz regime, which were 97.6 μm for the simulation and 96.7 ± 0.1 μm for the measurement.
Study on electron and hole states in tilted quantum well structures
Authors: Bukaew W , Sivalertporn K 
Published: December 2019

Abstract
In this study, the energy states of electron and hole in GaxIn1-xNyAs1-y/GaAs tilted quantum well structure have been theoretically investigated. The content of x and y are 0.65 and 0.005 respectively. The energy states and wave functions have been calculated by solving the Schrödinger equation in real space. The well width of 2-10 nm, barrier width of 2-10 nm and tilted layer width of 1-3 nm are considered in this work. The results show that the electron and hole energies decrease with increasing the well width and tilted layer width. The wave functions are both symmetric (ground state) and anti-symmetric (the first excited state), and spread out as the well width increases. In addition, the barrier width of couple tilted quantum well structure has also been studied. It is found that the probability of finding electron and hole are equal in both wells and the wave function within barrier layer decreases with increasing the barrier width as well. The ground state energy increases and the first excited state energy decreases as the barrier increases. As a result, the two states tend to the same level when the barrier is more than 8 nm. This is because the wide barrier can decrease the interaction between two quantum wells and makes each quantum well acts as an isolated quantum well with no interaction between them.
Local glass transition of polyisoprene induced by graphene planes observed in silico through atomistic molecular dynamics simulations
Authors: Yolong Thipjula , Sutthibutpong Thana 
Published: December 2019

Abstract
A study on the molecular mechanisms of natural rubber reinforcement due to the addition graphene planes was carried out by molecular dynamics simulations. Simulations of pure natural rubber (Polyisoprene; PI) and Polyisoprene-graphene composite (PI-GRA) were performed and analyzed for their glass transition temperatures (Tg). In the simulations, simulated annealing technique was used to change the temperature from 100 K to 300 K in order to observe the glass transition from the point where the sudden increase in volume and sudden decrease in density were observed. Glass transition temperature (Tg) from the molecular dynamics trajectory of pure PI was 207.9 K, close to the value Tg = 211 K obtained from the experiment. Also, we found that glass transition temperature (Tg) increased to 220.1 K when adding graphene planes into the PI matrix. In addition, further analysis of MD trajectories showed that the overall density of pure 16-mer cis-1, 4-polyisoprene at low temperature (100 K) is higher than the density at high temperature (300 K) and the threshold density for glass transition was 929.4 kg/m3. For PI-GRA at 100 K, density of the whole system was higher than the threshold density, which showed that the whole polymer was in glass phase. However, at 300 K, the network of PI molecules nearby the graphene planes were orderly organized and possessed higher density than the threshold density, which showing the properties of glass. In the middle area, PI molecules were arranged disorderly and has a lower density than the threshold, showing the properties of rubber.
Photometric study of the short-period contact binary CW Canis Minoris
Authors: Panpiboon P , Chinasa P , Punon M , Pharanud W , Sutthapintu A , Duangsopa A , Promsri C , Nilakhon C , Nontasee K , Nontachan N , Antapanya N , Saengnam T , Lawan T , Choawanklang W 
Published: December 2019

Abstract
We present the new BV light curves of the short-period contact binary CW Canis Minoris. The (O-C) diagram was fitted with times of minima for a new linear ephemeris which the period of the contact binary is found to be 0.313152 (±0.000053) days. The orbital period of the eclipsing binary is found to show a long-term increase at a rate of 3.34 (±0.50) × 10-7 days per year. The light curves were analyzed by the Wilson-Devinney code which has a mass ratio of 0.710 (±0.003) and a degree of contact about 0.013 (±0.989) %. The geometric structures of CW CMi are obtained with the components exactly filling its limited lobe.
Effects of hydrogen peroxide on 304 stainless steel in high temperature water
Authors: Makjan S , Boonsri P , Channuie J , Kanjana K 
Published: December 2019

Abstract
Hydrogen peroxide (H2O2), an oxidizer produced by water radiolysis, is considered one of the main contributors to corrosion of the stainless steel (SS) components in the cooling system of nuclear reactors. The detailed understanding of this chemical system is however still missing. The present research aimed to study the effects of H2O2 on 304 SS. The surface morphology and the chemical composition of the SS specimens after experiment were examined using Scanning Electron Microscope – Energy Dispersive X-ray (SEM-EDX). The change in atomic % of Fe, Cr, Ni, and O as a function of temperature will be reported. The corrosion type and possible corrosion products will be proposed and discussed.
Reverberation mapping of the disc wind in ultraluminous X-ray source NGC 5408 X-1
Authors: Loekkesee S , Chainakun P , Luangtip W 
Published: December 2019

Abstract
Recent observational evidences suggested that ultraluminous X-ray sources (ULXs) which are in supercritical accretion rate might release the outflowing wind and change the geometry to slim disc. However, the exact structure of the disc is still unclear. In this work, we develop a simple reverberation model to analyse the X-ray time lags of the ULX NGC 5408 X-1, in order to determine the geometry of the disc and the outflowing wind. The data of NGC 5408 X-1 from the XMM-Newton archive are binned into three groups based on the instrument count rates, i.e. low, medium and high count rates. The lag profiles are then extracted from each group. Fitting the models to the lag data suggests that the wind-launching radius tends to increase with the count rates, which is in agreement with the super-Eddington framework that prefers a stellar mass black hole (sMBH). The wind-launching radius for the sMBH is constrained to be in the order of ∼ 105rg. We also report a degeneracy between the black hole mass and the wind launching radius. A more realistic geometry and model might be required to explain the time lags in NGC 5408 X-1.