bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of K+ potential on the nuclear equation of state for the K+ production in heavy ion collisions by using a quantum molecular dynamics model
Authors: Chaimongkon Phacharatouch , Jeerakad Jenitsata , Doo-saard Tidarut , Douykhumklaw Chanadan , Prajit Sakda , Sittiketkorn Panadda , Thongkum Patcharapan , Srisawad Pornrad 
Published: December 2019

Abstract
This work investigates and focuses on the effect of K+ potential on the nuclear equation of state (soft and hard EoS) for K+ production in heavy ion-collision by using the quantum molecular dynamics model (QMD). Production of a cross-section of K+ mesons in 197Au +197 Au collision at incident energy 1.1 (polar angle 56°) and 1.46 (polar angle 40° and 56°) A GeV respectively, as well as studying impact parameter between 4.14 and 12.41 fm. The production cross-section as a function of the laboratory momentum (plab) is computed and compared with KaoS experiments. The calculations performed with and without Brown-Rho parameters (K+N) as well as the soft and hard equation of state. The results displayed the theoretical calculations with the soft EoS are similar to the hard EoS. The theoretical calculations with soft and hard EoS while including K+N potential tend to be consistent with the KaoS experiments, this indicates that the production of the cross section for K+ mesons as a function of the laboratory momentum is one of sensitive probes to extract information on the K+N potential at high densities.
Development and validation of portable X-ray fluorescence spectrometry for elemental routine measurement in geological samples
Authors: Nuchdang S , Sukhummek B , Rattanaphra D 
Published: December 2019

Abstract
A pressed pellet technique was developed for quantitative analysis of elements in geological samples by portable X-ray fluorescence spectrometry (pXRF). Validation of analytical method was done using eight geological reference materials (BCR-2: basalt, COQ-1: carbonatite, GSP-2: granodiorite, JA-1: andesite, JB-2: basalt, JG-1a: granodiorite, JG-2: granite and JSy-1: Syenite). Minimum concentrations of Al, Ca, Cu, Fe, K, Mn, Pb, Rb, Si, Sr, Ti, Y, Zn and Zr in geological reference materials for pXRF detection were 6.60%, 0.50%, 19 mg/kg, 0.06%, 0.35%, 120 mg/kg, 5.36 mg/kg, 7.37 mg/kg, 1.62%, 17.92 mg/kg, 0.09%, 24.90 mg/kg, 13.60 mg/kg and 51.20 mg/kg, respectively. The accuracy of the developed method was acceptable with the mean error below 18%. The geological samples received from the Department of Mineral Resources (DMR) were also tested using this method. The results showed that the concentration values obtained by the studied method were in good agreement with those obtained by the DMR for K, Mn, Pb, Rb, Si, Sr, Ti, Y and Zn with concentrations ranging of 3.70-4.20%, 90-400 mg/kg, 64-89 mg/kg, 296-404 mg/kg, 24.44-32.17%, 50-180 mg/kg, 0.22-0.28%, 34-47 mg/kg and 30-41 mg/kg, respectively. This method is suitable for elemental routine measurement in geological samples.
Examination of Thai freshmen’s understanding on vectors using a model analysis technique
Authors: Kusindrastuti B , Reyes M G , Rakkapao S , Prasitpong S 
Published: December 2019

Abstract
This study focused on an investigation of Thai students’ comprehension of vectors using the model analysis technique, which is based on the matrix representation of quantum physics. This technique displays students’ knowledge states and the probability of applying each mental model to solve a given vector concept. A well-known vector concept test in physics education research named the Test of Understanding of Vectors (TUV) was translated into Thai language and validated by a group of physics lecturers. It was administered to 651 first-year engineering students at Prince of Songkla University via the online system at the beginning of the first semester. The three common mental states of vectors were identified as correct, popular incorrect, and other models. Model estimation of the model analysis revealed that although 54% of the students correctly answered vector addition, they still had difficulty with vector subtraction. Theoretically, both topics are considered as identical concepts. The students had inconsistent ideas on vector subtraction as reported by eigenvalues < 0.65. Moreover, they demonstrated equal distribution in using the three mental models to solve the dot product of vectors. The most common incorrect idea was that a dot product resultant was a vector quantity. The initial knowledge states of the cross product were in an incorrect model region involving confusion between calculating magnitudes of the cross product and the dot product, and incorrectly applying the right-hand rule to locate a direction of the cross product. Overall, the findings will guide instructors which common vector ideas should be revised and how. The vector concept plays an important role in physics learning since it is embedded in several physics topics as a learning mechanism.
An experimental study: mixing rate of granular materials under vertical vibration
Authors: Chaiworn P , Kiengmana K 
Published: December 2019

Abstract
This research aims to the master development result of learning in mixing ratio and quickly rate of mixing granular material for elementary study apply and development of mixing ratio industry and agriculture. The researcher separate 2 parts of mixing ratio put low dense material on the top and high dense material on the top with frequencies from 6, 7 and 8 Hz, Recording 60 s. of picture frame. Counting the mixing granular material in different high in container. Calculating the percentage of mixing in each different high, mixing rate 0 – 1 different of each experiment. Material used ceramics (1.61 g/cm3), plastic (0.98 g/cm3) and wood (0.72 g/cm3). It was found that more frequency better mixing, the high dense granular material on the top is mixing rate better than the low dense granular material on the top. In the time at 40 – 60 s. were the best of mixing rate, mixing granular material with different time in each frequency. The movement of granular material able to occurs in many form, disperse, clumping and spin and roll. Furthermore, the low dense granular much more quickly movement. Conclude that density, position, frequency and time effect to mixing. Frequency very with quickly but inverse with density of material and the materials were mixed at its best in each period of time different.
Wavelet spectrum analysis of PM10 data in Bangkok, Thailand
Authors: Anusasananan P 
Published: December 2019

Abstract
PM10 is one of the key factors which influences the air quality in metropolitan areas throughout the world. In this research we investigate the variation period of PM10 concentration and its temporal patterns from 2009 to 2017 in Bangkok, Thailand using wavelet spectrum analysis. We also utilize the cross wavelet transform to study the potential relation between PM10 and the temperature. From the wavelet power spectrum of PM10, we can distinguish two dominant bands, one in the period between 8-16 months and the other between 1-8 months. The first oscillation is obviously related to natural annual periodicities that the high power occurs from December 2011to February 2015. The PM10 concentrations are high in winter and low in the rainy season. The second band between 1-8 months is the transient pattern with very high concentration of PM10 occurs only in the year 2013. Wavelet spectrum of the temperature is similar in pattern for it shows the strong annual signal and the lowest temperature band between 4-8 months. The cross wavelet transform (XWT) power spectra between PM10 and the temperature show significant common power, in the 8-16 month band from November 2009 to June 2016, and in the 1-8 month band around November 2012 to February 2014. The wavelet transform coherence (WTC) spectra show that PM10 and the temperature co-varied out of phase during all observed time intervals. This indicates the high seasonal dependence between PM10 and the temperature. Knowledge of the variation period of PM10 concentration and its evolution feature in Bangkok area will help the authorities to better prepare for public health and environmental hazard from the next PM10 pollution.
Measurement of radon concentrations and effective dose assessment in groundwater from Kamphaeng-Saen district, Nakhon Pathom province and Ban-Pong district, Ratchaburi province
Authors: Raksawong S , Sola P , Tampraserd P , Macha K , Khonman S , Somingmee C 
Published: December 2019

Abstract
Radon monitoring has been increasingly conducted worldwide because it is considered as the hazardous effects on the human healthy, probably making an increased cancer risk when people received radon by inhalation of air and ingestion of water containing high concentrations over extended periods of time. Radon is natural occurring radionuclides found in the rock, soil and water, and can therefore enter in the water supplies used for drinking water. The objective in this study was to determine the radon level in groundwater in order to set up a policy on water management. The groundwater radon concentrations were measured by RAD7 device with RAD H2O technique following a protocol proposed by the manufacturer from 26 groundwater samples randomized in Kamphaeng-Saen District, Nakhon Pathom Province and Ban-Pong District, Ratchaburi Province where the groundwater has been frequently used for public tap water. The results show that the radon concentrations range between 0.05 and 2.51 BqL–1 with an average value of 0.95 BqL–1. All measured radon concentrations are well below the allowed maximum contamination level (MCL) of radon concentration in water of 11 BqL-1, proposed by US Environmental Protection Agency (USEPA). The annual effective doses of adults calculated for inhalation and ingestion are below 12.74 µSvy–1, and also well lower than the safe limit (100 µSvy–1) recommended by World Health Organization and EU Council. Thus radon in groundwater of this study do not pose any significant health risk to the public.
Effects of surface diffusion length on steady-state persistence probabilities
Authors: Chanphana R , Chatraphorn P 
Published: December 2019

Abstract
The dependence of the steady-state persistence probabilities (Ps) and exponents (θs) on surface diffusion length (l) for four discrete growth models is investigated. The persistence exponents which describe the decay of the persistence probabilities, the probabilities of the average of all initial height (h
0), are increased as l is increased for all models. The results of one-dimensional Family ((1+1)-Family) and Das Sarma-Tamborenea ((1+1)-DT) models with kinetically rough film surface show the decrease of the growth exponent (β) with l. The l>1 results preserve the relation

β
=
max
[
1
−

θ
+
S

,
1
−

θ
−
S

]

. In contrast, β is observed to increase with l for the two-dimensional larger curvature ((2+1)-LC) and Wolf-Villain ((2+1)-WV) models with mounded morphology. Our results show that the

β
=
max
[
1
−

θ
+
S

,
1
−

θ
−
S

]

relation is not valid in l>1 cases in models with mounded surfaces. The persistence probabilities of a specific value of initial height (Ps
(h
0)) for l>1 are found to behave differently between mounded and kinetically rough models.
Efficiency of solar tree based on golden ratio
Authors: Srisai S , Harnsoongnoen S 
Published: December 2019

Abstract
The efficiency of a solar tree based on golden ratio was investigated and analyzed. The lengths and angles of the trunks, main branches and sub-branches are designed using the golden ratio principle. A trunk is divided into five ranges based on the Fibonacci sequence, consisting of four main branches and four sub-branches. The angle between the trunk and main branches, main branches and the next main branches, main branches and sub-branches, subbranches and the next sub-branches is equal to 137.5° (golden angle). The solar cells are installed at the ends of all branches along the direction of each branch. The power efficiency of the proposed structure and the land-based fixed angle are compared. The measurement system consists of (a) solar cell electricity measurements (voltage and current) and (b) environment measurements (temperature, humidity, and light intensity). The data are recorded through DAQ cards (PCI 628, Elvis board and USB 6008) which are connected to the LabVIEW program for analyzes and monitors. The experimental results show that the power efficiency of the solar tree based on the golden ratio was more than the land-based fixed angle by 1.295 percent and solar cells positioned at the end of branches (T1) of the trunk can generate most power.
Non-contact active microwave sensor for glucose concentration measurement
Authors: Suwanna K , Harnsoongnoen S 
Published: December 2019

Abstract
A non-contract microwave sensor with a common emitter amplifier circuit for glucose concentration sensing is developed and investigated in this article. The geometries and materials of the designed sensor are optimized and analyzed by the full-wave electromagnetic simulation. The microwave prototype was created using a printed circuit board based on dry film techniques. The microwave sensor was connected to a vector network analyzer (VNA) and the electromagnetic interaction between the samples and sensor was analyzed. The proposed sensor was tested for its electromagnetic response to glucose at various concentrations ranging from 0 to 16 % (W/V) with steps of 4 % (W/V) in the frequency range from 2.0 to 4.0 GHz through the measurement of the transmission coefficient (S21) and quality factors (Q-factor) based on non-contact detection. The experimental results confirmed that the magnitude of S21 and Q-factor were changed when the concentration of glucose was changed. The magnitude of S21 and Q-factor were reduced when the glucose concentration is increased. Based on the results of the study, the proposed microwave sensor will be further developed to measure the concentration of soluble glucose and can be used as a sensor for chemical solution measurement and biometrics without damaging the structure of the substance.
Optical morphology of the ejected Shell of V339 Del using SHAPE
Authors: Sutham S , Sobbong J , Surina F , Awipan S 
Published: December 2019

Abstract
The morphology of the ejected shell of V339 Del (Nova Del 2013) outburst was preliminary studied. The optical spectra from the Liverpool telescope around 80 days after discovery were examined. Synthetic line profile spectra were compared to emission lines of Hβ in order to find the best-fit morphology of the ejected shell using the programme SHAPE. When adopted an inclination i = 65° and suggested shape of the shell from literature, a simplest preliminary morphology was found to be a bipolar at squeeze parameter around 0.8 - 1 with a torus.
Real-time and versatile laser-power stabilization with arbitrary amplitude modulation
Authors: Phrompao J , Pongvuthithum R , Sucharitakul T , Srakaew K , Anukool W 
Published: December 2019

Abstract
We have demonstrated a technique to stabilize laser power at any point in an optical circuit. By employing a self-made Arduino-controlled stabilizer for real-time monitoring and generating feedback signal, the power fuctuation after an acousto-optic modulator (AOM) can be suppressed to 0.16% at an average power of 33.34µW. Our arrangement also allows simultaneous amplitude modulation using an arbitrary waveform. The system design and principle of operation are described.
Synthesis and characterization of Fe-doped TiO2 hollow nanospheres prepared by carbon sphere as hard template
Authors: Kanjana N , Laokul P 
Published: December 2019

Abstract
Fe-doped TiO2 hollow nanospheres (THs-Fe) with various Fe-dopant concentrations (0.25, 0.50, 0.75 and 1.00 mol%) were prepared using carbon spheres as templates. After calcination, the obtained hollow structure TiO2 were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDS) and ultraviolet-visible spectroscopy (UV-Vis). The analysis results revealed that the crystallite size and crystallinity of the samples decreased with increasing Fe content. Morphology and particle size were investigated by electron microscopic techniques and the results showed that dopant concentrations had a significant influence on average particle size. The average diameter of hollow spheres decreased from 146.92 to 61.57 nm when Fe-content increased from 0.25 to 1.00 mol%. The UV-Vis absorption spectra exhibited that the absorption edge of THs-Fe was shifted toward the visible light region with increased Fe content. The energy gap (Eg) was decreased from 2.85 to 1.84 eV when the dopant content increased from 0.25 to 1.00 mol%.
GADGET-2 simulation for active galactic nuclei feedback in galaxy NGC 5252
Authors: Boonmalai M , Sawangwit U , Wannawichian S 
Published: December 2019

Abstract
We present a numerical simulation of active galactic nuclei (AGN) feedback in galaxy NGC 5252, while galaxy has gas, halo, disk, and bulge particles. We set up one bulge particle’s mass to represent the black hole mass. According to the result from numerical simulation of active galactic nuclei feedback, we interpret that the gas provides some gas feedback at large distant approximately around 10 kpc. We generate initial condition, as known as IC fle of the galaxy, including a stellar disk and gas particles following an exponential density profle. A dark matter halo and a stellar bulge follow a Dehnen density profle. GADGET-2 was used to calculate the distribution of particles in galaxy simulation, which is based on smoothed particle hydrodynamics method. Ultimately, we study the gas feedback of active galactic nuclei in the form of outfow gas with numerical simulations. From preliminary result show that the gas particles seem to evolve with time and concentrate on the later time near 5 to 10 kpc.
A simple technique for measuring the spatial correlation of photon pairs for complete interference in the Michelson interferometer
Authors: Boonkham K , Limsuwan P 
Published: December 2019

Abstract
In this research, a simple technique for measuring the spatial correlation or angular correlation of photon pairs was developed. The system consisted of two aluminium rails which had the same pivot at the position of a nonlinear crystal. The rails were manually moved to find the position of the correlated photon pairs. At this position, the photon pairs were collected by the collimators attached at the end of the rails. The pairs were produced by type I spontaneous parametric down-conversion process using a 405 nm diode laser and a BBO crystal. The crystal was specifically cut for emitting the photon pairs at an angle of 3° with respect to the direction of the pump laser. These pairing photons were correlated and interfered in the Michelson interferometer, then, the correlated photons were demonstrated. It was found that the visibilities in the case of perfect alignment, near perfect alignment and misalignment were V = 1.0000 ± 0.0004, 0.869 ± 0.002, 0.591 ± 0.002 and 0.168 ± 0.002, respectively.
A development of a low-cost pyranometer for measuring broadband solar radiation
Authors: Tohsing K , Phaisathit D , Pattarapanitchai S , Masiri I , Buntoung S , Aumporn O , Wattan R 
Published: December 2019

Abstract
In this work, the design of an inexpensive and reliable pyranometer used for measuring broadband solar irradiance is proposed. A BPX43 – 4 phototransistor is used as a light detector, which has the spectral response in the range approximately 450 to 1100 nm. This system is controlled by an Arduino pro mini ATmega328P (5 V, 16 MHz) microcontroller and all components are located inside a FB05 black box. Due to a high level of solar radiation in the different environmental conditions, the pyranometer encountered the voltage saturation. Therefore, a 0.25 mm thick of Teflon is selected for attenuating the sunlight. After investigating against a reference sensor, the transmittance of this attenuator is found to be about 12.5%. Finally, the experimental results from the system are compared with a standard pyranometer performed at Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center (PMOD/WRC, 46.80 °N, 9.83 °E and 1, 610 meters above sea level), Switzerland. The results demonstrate a satisfactory agreement between the global irradiance obtained from our proposed pyranometer and the standard pyranometer.
Extracting overlapping 2D-images by central-derivatives-based algorithm
Authors: Palasak Hataiwat , Pholsen Natthajuks , Tianprateep Montian , Wannadelok Orapin 
Published: December 2019

Abstract
Usual algorithms, such as, 5-steps and a backward-derivatives-based (BDB) method, could extract an image of a top layer from a one of a base layer in a 2D full-field optical coherent tomography (FFOCT). Those both algorithms still give the robust images. For improving the quality of the image in 2D-FFOCT, in this research a central-derivatives-based (CDB) algorithm is introduced to apply for investigating two overlapping 2D images. According to our simulation, it shows that the performance of CDB-algorithm is as good as the one of 5-step algorithm in case a phase difference between each fringe images is not more than 40 degree. It is also less robust by comparing with the one of BDB-algorithm. By our experimental results, it can also be concluded that the CDB-algorithm can separate two overlapping 2D images with more brightness than the ones applied by BDB-algorithm.
Effect of static magnetic field on ripening of Thai cavendish bananas
Authors: Mahathaininwong N , Chucheep T , Thitithanakul S , Wandee S , Karrila S , Narakaew J 
Published: December 2019

Abstract
This study aimed to investigate the effects of static magnetic fields on the ripening of Thai cavendish banana fruits. The cavendish bananas were received from an agriculturist in Kanchanadit District, Surat Thani province, Thailand. NeFeB magnets were used to generate the maximum static magnetic fields of 300 mT and 600 mT. The ripening of the banana fruits was recorded in terms of weight loss, color change and firmness after exposure to a magnetic field. The results showed that the weight loss of the banana fruit when exposed to magnetic field was higher than in the not exposed control group. Increasing the magnetic field strength to 600 mT increased the weight loss further from that with 300 mT. The effects of magnetic field on weight loss of bananas were statistically significant, but there were no statistically significant differences in color or firmness from the control group.
A causal model of factors affecting azimuth and altitude learning by smart phone in astronomy
Authors: Wimuttipanya J 
Published: December 2019

Abstract
In present, physics learning management has developed into learning technology from easy to complex levels with many developed media increased. Smart phone is one of all media use in many automatically. In this paper, researcher used instruction of a causal model of factor affecting azimuth and altitude learning by smart phone in astronomy using by rotating the position, finding the angle of the star in the sky which tells the coordinates of the star from applications created used by cell phones and Wi-Fi. It was suggested that student using their phones to download a free app that would monitor frequencies and send data to a processing facility. Methods for teaching and learning that students have analysed solve problems that are linked to the problems of everyday situations and conclusions through the team’s idea to solving problems of inequality in access to quality education of students who are far away and the practice of research practices that can be used to develop educational institutions. The results indicated that the adjusted model was consistent with empirical data. Goodness of fit measures were found to be: χ2 = 271.59, df = 149, p-value = 0.00063, GFI = 0.95, RMSEA = 0.042.