bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigations of physical and structural properties of calcium alumino silicate glasses doped with samarium (III) oxides
Authors: Suebsing N , Lekkla W , Lhakjun D , Laopaiboon R , Bootjomchai C 
Published: December 2019

Abstract
We synthesized and investigated the physical and structural properties of calcium alumino-silicate glasses systems: (60-x)SiO2–2.5Al2O3–10CaO–17Na2O–10K2O–0.5Sb2O3–xSm2O3. The samples were prepared using melt quenching method. Density was measured using Archimedess principle, and the physical properties such as the ion concentrations, interatomic distance, polaron radius, and field strength were calculated. The density, the calculated ion concentrations, and field strength increased while the interatomic distance and polaron radius decreased with increasing of Sm2O3 contents. The structure of the glasses was characterized using the Fourier transform infrared spectrometer. The FTIR result showed that the change in the network structures of these glasses depends on the concentration of Sm2O3.
Pitch-angle diffusion coefficients in test particle simulations and the estimation of the particle parallel mean free path
Authors: Pleumpreedaporn C , Snodin A P 
Published: December 2019

Abstract
The transport of energetic charged particles in turbulent magnetic fields is a topic of interest in various astrophysical contexts. In order to estimate the mean free path of a particle in the direction parallel to the mean magnetic field, one can use theoretical expressions that employ pitch-angle diffusion coefficients. In this work we review some of the methods used in estimating pitch-angle diffusion coefficients from test particle computer simulations. We examine if these methods and theoretical approaches are able to provide consistent estimates of the parallel mean free path, that can also be obtained directly from computer simulations. We perform test particle simulations for synthetic turbulence models over a range of turbulence parameters and particle energies. From the trajectories of test particles, pitch-angle distribution functions and statistics of pitch-angle displacements are obtained, which are then used to estimate the pitch-angle diffusion coefficients. We find that a method using the pitch-angle flux and derivative of the pitch-angle distribution is able to provide accurate values for the parallel mean free path over the range of parameters considered. Other methods considered are accurate only for a limited range of the turbulent fluctuation strength, or must be evaluated at a specific time to provide a reasonable estimate.
The relationship between raining and GPS – precipitable water vapor
Authors: Choosakul Nithiwatthn , Jaiyen Sarawut , Jairuk Umpon , Authisin Janthanee 
Published: December 2019

AbstractPrecipitable water vapor (PWV) can be retrieved from the delayed of the propagating GPS signal through the wet atmosphere. In the experiment, the GPS data in 2009 from the permanent GPS station name of CUSV were used to estimate the amount of integrated vertical water vapor above the GPS station in term of PWV. The results showed that the PWV were fluctuated all year long with their averaged of 31.05 mm. At the beginning of the year, the PWV were slightly increased until reach a plateau around DOY 120. This plateau was higher than their averaged around 10 mm in six months during the midyear. Then, the PWV gradually decreased until the end of the year. In addition, the strongly relationship between the rainy day and the PWV was found. 95.76 % of total rainy days (165 days) confirmed that the PWV were higher than their averaged. On the other hand, 69.00 % of total non – rainy days (200 days) showed that the PWV were lower than their averaged. Therefore, the PWV can be used as the key indicator of rain prediction.
Upper limits on dark matter annihilation with the teraelectronvolt cosmic ray spectrum of electrons and positrons from DAMPE
Authors: Wechakama Maneenate , Khan Cantlay Brandon 
Published: December 2019

Abstract
We have used teraelectronvolt cosmic ray spectrum of electrons and positrons data from DArk Matter Particle Explorer (DAMPE) to estimate the upper limits on dark matter annihilation. We have created modeled spectrum of electrons and positrons by considering dark matter annihilation into electrons and positrons with different channels. After the production, electrons and positrons can lose their energy by interstellar medium and interstellar radiation field. We have considered loss processes such as inverse Compton scattering, synchrotron radiation and ionization. The upper limits on dark matter annihilation cross-section have been investigated by comparing the model spectrum and observational spectrum. The stringent constraints is from electron-positron channel.
The effects of layer thickness and charge mobility on performance of FAI:MABr:PbI2:PbBr2 perovskite solar cells: GPVDM simulation approach
Authors: Sittirak Maythawee , Ponrat Jiraporn , Thubthong Kanyaporn , Kumnorkaew Pisist , Lek-Uthai Jeerranai , Infahsaeng Yingyot 
Published: December 2019

Abstract
The perovskite solar cells (PSCs) have been extensively interested and its performance has rapidly increased up to 24.2 %. Layer thickness and charge mobility are crucial for high-performance perovskite solar cells. In this paper, we study the effect of layer thickness and charge mobilities on some parameters in perovskite solar cell based on structure of FTO/TiOx/SnO2/FAIMABrPbI2PbBr2/Spiro-OMeTAD/Ag by using the GPVDM (General-purpose Photovoltaic Device Model) software. The simulation results show that the best optimized power conversion efficiency of 23.88 % can be obtained. The optimal layer thickness in the simulation of TiOx, SnO2, FAIMABrPbI2PbBr2, Spiro-OMeTAD are 50 nm, 30 nm, 400 nm, 30 nm, respectively. The optimal electron and hole mobilities of photoactive layer are 2×10-5 m2V-1s-1 and 2×10-6 m2V-1s-1, respectively. Comparative study of simulation and experiment are observed, that performance of 15.93 % of efficiency can be experimentally achieved, however the model of this solar cell is observed 18.43 % of efficiency by simulation.
The effects of dielectric barrier discharge atmospheric air plasma treatment to germination and enhancement growth of sunflower seeds
Authors: Yawirach S , Sarapirom S , Janpong K 
Published: December 2019

Abstract
This research was to study the effectiveness of dielectric barrier atmospheric plasma (DBD) on sunflower seed (Helianthus annuus). The DBD plasma was driven with a power of 90 watts. The samples consisted of five groups; control group, samples 1, 2, 3 and 4 being treated by DBD plasma with time limits of 30 s, 60 s, 90 s and 120 s, respectively. The physical properties and chemical properties were observed using SEM and water contact angle. Growth parameters were studied by the water uptake, seed germination, sprouts length and dry weight. Compared with the control sample the results showed the contact angle decreased and the wettability increased. The surface roughness in all conditions increased with increased power. With bigger power the water absorption decreased and super hydrophilic was achieved with 120 s treatment. The water uptake of plasma produced the best result using the DBD plasma treatment of 120s. The distribution of sprouts length and the dry weight both increased with increased power. The DBD plasma treatment on sunflower seeds improves seed germination rate and lead to a significant change in wettability and growth parameter.
Investigation on current transformers for measuring of electron beam pulse current
Authors: Nanthanasit P , Rimjaem S 
Published: December 2019

Abstract
The radio-frequency (RF) linear accelerator (linac) system of the PBP-CMU Electron Linac Laboratory at the Plasma and Beam Physics Research Facility is used as an injector system for future mid-infrared and terahertz free-electron lasers. The properties of electron beams produced from the linac must be controlled appropriately to produce high-quality radiation. One of the most important properties is the electron pulse current that can be measured using a current transformer. A copper wire with proper insulator is wounded around the ferrite-core forming a secondary coil of the current transformer. The electron beam passing through the transformer acts as the current in the primary coil and it induces an electromotive force in the secondary coil. Therefore, the output signal from the secondary coil can be measured and analyzed to be a pulse current of electron beam. The measured current pulse shape and value strongly depend on the characteristics of the current transformer. This study focuses on testing and calibrating of existing current transformers installed in the linac system. In the experiments, the pulse generator was used to generate the input pulse current with various pulse lengths. The output pulses were then sampled with a digital oscilloscope. The experimental results showed that the output pulses from the current transformers have distort shape compared with the input pulses. Consequently, the correction was conducted to provide more accuracy of the measuring value of the electron pulse current. The results of this research can be used as a valuable database for the existing current transformers and to develop the new ones that can provide more accurate results.
Optical spectra of periodically patterned dielectric surface simulated by finite-different time-domain method
Authors: Sitpathom N , Dawes J M , Muangnapoh T , Kumnorkaew P , Suwana S , Sinsarp A , Osotchan T 
Published: December 2019

Abstract
A dielectric film imprinted with a hexagonal periodical pattern of nanosphere holes can be fabricated by a two-step process of depositing a dielectric thin film on a hexagonally patterned array of nanospheres fabricated by convective deposition, and then removing the nanosphere particles. In this work, the optical transmission through a dielectric slab with hexagonal pattern of half-sphere holes was simulated by finite-different time-domain (FDTD) methods. In the simulation, a short gaussian pulse of electromagnetic waves was generated and propagated through the dielectric patterned slab and the near-field diffraction from the structure was collected as a function of time. Using a Fourier transformation, the optical spectra of the structure were evaluated. The far-field diffraction was also investigated by evaluating the analytical Green’s function at given points. Several parameters of the optical response including full width at half maximum and relative intensities of high order diffraction peaks were examined for various structure sizes. The structures examined were composed of a periodic hexagonal pattern of half nanosphere holes (radius of 290 nm). In addition, the effect on the optical response of 10% elliptical shape deformation of the half-sphere holes was studied. Our calculations enable us to identify parameter schemes where the third order diffraction exceeds second order diffraction efficiency from gratings.
Simulation of square-frame dipole coils for steering of electron beam
Authors: Kongmali K , Rimjaem S 
Published: December 2019

Abstract
This study focuses on magnetic field simulation of a square-frame steering magnet and electron beam dynamic simulations in its magnet’s field at the PBP-CMU Electron Linac Laboratory, Chiang Mai University. The small dipole magnets with the same design were constructed from four identical iron bars winding with 70 turns of copper-wire. They are used for steering electron beam with a maximum kinetic energy of about 2.0 MeV in the pre-injectors system of the electron accelerator. The magnetic field simulations were conducted by using computer programs POISSON and RADIA for two-dimensional and three-dimensional models, respectively. The maximum magnetic fields at an excitation current of 1 A were 44.30 and 57.32 Gauss for the 2D and 3D models, respectively. The magnetic effective length was 10.45 cm. The electron beam dynamic simulations in the 3D magnetic field map was performed by utilizing a computer program ASTRA to investigate the transverse electron beam distribution along the magnetic axis. The achievement of this study will be used as an important information for proper operation of the magnets at our facility.
Charged fermion in two-dimensional curved spaces of constant Gaussian curvature with constant magnetic flux
Authors: Rojjanason Trithos 
Published: December 2019

Abstract
We investigate the behavior of spin-1/2 particles (electron and positron) confined to the Gaussian curvature surfaces. For the non-negative Gaussian curvatures, we present the preliminary results in cylindrical and spherical cases. To be specific we use the deformed hyperbolic solutions to obtain eigenvalues of the Dirac equation in the presence of an axial gauge field. Our results demonstrate the quantized energy and eigenstates of fermion. The quantization of energy depends on the spin-orbit coupling and the Landau quantization. The imaginary energy is obtained from the negative Gaussian curvatures. It is interpreted as the quasi normal mode (QNM). The angular momentum of fermion is shifted by addition of the constant magnetic flux. The fermion behaves like boson when the flux is half-integer.
Influence of local rice husks ash on compressive strength of normal-strength concrete
Authors: Fanggi B A L , Moata M , Mata A , Liem F , Woenlele T , Ndun S , Lada J 
Published: December 2019

Abstract
It is well known that rice husks ash can be used as cementitous material. However, different climate and geographical conditions could provide different quality of the ash. Therefore, this study aimed to investigate the effect of different percentage of rice husk ash (RHA) taken from Oesao village in Nusa Tenggara Timur-Indonesia on compressive strength of normal-strength concrete. Eight specimens with diameter of 150 mm and height of 300 mm made of normal-strength concrete with replacement of .0%, 5.0%, 10%, 15% of Portland cement with RHA were cast, prepared, and tested until failure. It is found that the maximum strength was observed on specimen with replacement of 10% of the ash.
Analysis of horizontal deviation values on shearwalls in building structure according to earthquake load design
Authors: Walujodjati E , Roestaman R , Farida I , Agesti M A 
Published: December 2019

Abstract
Technoplex Living Apartment Bandung is one of the buildings using a shear wall that is built in earthquake-prone areas. This study analyzes the CW3 shear wall Type which aims to determine the seismic load design using spectrum response analysis that is applied and analyzed on the structure of the building so that the horizontal deviation value that will be compared against the value of horizontal deviation that is permitted under SNI 1726 of 2012 is obtained. The results of this study can be concluded that the CW3 shear wall produces the highest horizontal deviation value in the direction of X of 0.032 m greater than the highest horizontal deviation value in the direction Y of 0.0042 m. Because it was analyzed in one direction, namely the X direction with the percentage of earthquake loads received using orthogonal systems where the X direction building structure received an earthquake load of 100% while Y direction was 30% of the earthquake load as a result of the spectrum response analysis method and the resulting horizontal deviation value was below the allowable safety margin, the percentage of X direction is 56.7% while Y direction is 92.3%.
Study of PVD effect on modulus of subgrade reaction
Authors: Zhafirah A , Somantri A K , Permana S , Roestaman R 
Published: December 2019

Abstract
The basic strength parameter that is important for use in designing pavement is the modulus of subgrade reaction (k). Increase in k-value can be obtained by soil improvement using preloading and PVD (Prefabricated Vertical Drain). The method that can be used to get the k-value is the plate load test using plates with a diameter of 304.8 mm in soil conditions without PVD and with PVD with a distance of 100 mm and 150 mm. The results obtained from the plate load test are settlement and pressure and then graphed. The k value is based on a pressure of 69 kN/m2 which determines a certain settlement. The most significant increase in the modulus of the subgrade reaction is that the soil mounted by PVD is 100 mm apart, an increase of 80.73%. Whereas for the soil installed PVD 150 mm increases by 56.24%. Based on this, soil with PVD with a closer distance gives a more significant increase in modulus of subgrade reaction.
Factors that affect the low quality of school buildings
Authors: Johari G J , Farida I , Permana S , Yogaswara D 
Published: December 2019

Abstract
School buildings have an important role in education. The problem that occurs is the low quality in rehabilitation. A quality control system is needed that can guarantee the quality of the building in accordance with the expected results. The purpose of this study was to identify what factors caused low quality in the rehabilitation of school buildings in Garut district. This study uses a quantitative approach to survey methods. The population and sample were 4,134 secondary schools that experienced rehabilitation in 2018 with a sample of 94 schools. The statistical analysis used was a confirmatory factor analysis. The results of this study are 13 variables that affect the low quality in the rehabilitation of school buildings in Garut Regency which are incorporated into 2 factors, namely project planning and implementation/project implementation. One dominant factor was obtained, namely the organizing factor for the implementation of activities. The indicators are division of tasks, time, capacity, and manner of implementation, estimated number of resources needed, Allocation of available resources, Ease of communication between the elements involved, Allocation of responsibilities for project implementation, Coordination of all activities and labor involved, Allocation of responsibilities for project implementation, Coordination of all activities and labor involved.
Confinement influence in cracking areas single reinforced concrete
Authors: Walujodjati E , Johari G J , Farida I 
Published: December 2019

Abstract
The combination of concrete and reinforcement in collaboration with the load is determined by the perfect bond of the two materials. The axial load is given in reinforced concrete results in internal cracking of reinforced concrete around the threaded reinforcement area. An area within the radius of cracking of the concrete around the reinforcement has also been obtained. The action is needed to reduce the area of cracked concrete by giving restraints using spherical spiral reinforcements within the concrete crack radius. It is expected to increase the strength of the reinforcement and concrete around it. The methodology used is Pull Out on single reinforced concrete cylindrical specimens with confinement and without confinement. Concrete cylindrical test specimens with a diameter of 150 mm 200 mm high with single reinforcement with a diameter of 10 mm, and spiral reinforcement as confinement with an identification diameter of 4 mm. Placed within the radius of cracking of the concrete around the reinforcement. The Pull Out test results indicate a cesarean movement from the edge that is loaded to the free end. The restrained specimen produces a larger cesarean at the end of the load, when the initial cesarean occurs at the free end.
Revenue components of road construction operations based on economic feasibility analysis
Authors: Farida I , Anasarida A A , Susetyaningsih A , Kurniawati R 
Published: December 2019

Abstract
Regional development is closely related to the provision of infrastructure, namely the road network with the hope of creating a positive impact. Roads as a means of connecting, open access, play a role in the smooth movement of people and goods and have the potential to increase economic activity. The purpose of this study is to analyze the economic feasibility of road construction. The method used refers to Pd.T-15-2005-B. Components analyzed the economic feasibility aspects of road construction are based on differences in vehicle operating costs and time values arising from differences in transportation costs on the new road and existing road. The results of the study took the form of specific recommendations and were a solution to the need for work to be carried out by examining the extent to which the level of feasibility, especially from the economic and financial aspects. The economic indicators used are Net Present Value, Internal Rate of Return, and Benefit-Cost Ratio. The indicator provides a scale that compares the benefits and costs of each alternative proposed, specifically each indicator has different characteristics. In general, all of these indicators need to be examined to more clearly describe economic events during the planning period.
The spatial structures and transportation infrastructure development in Banda Aceh City with TOD
Authors: Fadhly N 
Published: December 2019

Abstract
The spatial structure and construction of transport infrastructure in the city of Banda Aceh, in accordance with the strategy for developing the Banda Aceh City Spatial Plan (RTRW) 2009-2029 which combines the development of “multi-canter” and “linear-growth”. This has an impact on the inefficient development of transportation infrastructure with an increase in the number of vehicles 6% per year. The concept of TOD can eliminate urban sprawl, which turns urban sprawl into a compact city area. The method used is path analysis with, travel distance (X1), the purpose of the trip (X2), travel cost (X3) so that the equation can be obtained: Spatial Structure = 0.520 + 0.206X1 + 0,264X2 + 0,100X1, the relationship with infrastructure development transportation consists from variables, diversity of public/social facilities (X1), travel frequency (X2), the purpose of the trip(X3), travel costs (X4) and travel time (X5), so that the equation is obtained, Transportation Infrastructure Development = -1,457 + 0,652X1 + 0,388X2 + 0,235X3 + 0,222X4 + 0,327X5, from the model obtained, it can be concluded that the development of transportation infrastructure with the concept of TOD is strongly influenced by the spatial structure.
Traffic management of intersection with more than four road segments
Authors: Malia R , Fadhly N , Sugiarto S 
Published: December 2019

Abstract
Simpang Tujuh Ulee Kareng is one of the intersection that are crowded by local people who always doing movement in this area. The method of this research to calculated level of service this intersection by using SIDRA Intersection as a software, then it will merger of intersection be four road segments. The result and discussion of this intersection for existing condition based on Degree of Saturation (DS) for JD’s street is F. DS for TICI’s street is A. DS for LG’s street is A, DS for LR’s street is B, DS for MT’s street is A, DS for KR’s street is C, and DS for TIBPKP’s street is D. After the geometric merger into four road segments in unsignalized condition, DS for JD’s street and TIBPKP’s street is E, DS for TICI’s street is A, DS for LG’s street and LR’s street is F, and DS for MT’s street and KR’s street is F. For signalized condition, DS for JD’s street merger with TIBPKP’s street is E, DS for TICI’s street is E, DS for LG’s street merger with LR’s street is E, and DS for MT’s street merger with KR’s street is F.