bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling and simulation of a LaCoO3 Nanofibers /CNT electrode for supercapacitor application
Authors: Chinnasa P , Ponhan W , Choawunklang W 
Published: December 2019

Abstract
The supercapacitors are expected to represent the future of energy storage unit equipment due to their good performance on both the energy density and the power density. This paper is the first presentation of the mathematical form of the supercapacitor, which consists of LaCoO3 nanofibers electrodes and carbon nanotube electrode (CNT) as well as the electrical and concentration channels, the dynamic model used to determine the impact of the thickness of CNT electrode on the performance of supercapacitors in COMSOL Multiphysics. The results showed that when changing the voltage scan rate from 0.001, 0.01, 0.1 and 1.0 V/s, current and voltage increased. But the time to change the current density is reduced by a voltage scan rate of 0.001 V/s. The range of voltage changes from -0.4 to 0.4 V in the period of 1, 500 s and when adding the position of the length, the concentration will gradually decrease. The present model is conclusively verified to be effective and successfully provides a methodology to optimize the cell size in various applications.
A case study of a teaching and learning sequence for Newton’s third law of motion designed by a pre-service teacher
Authors: Sujarittham T , Tanamatayarat J 
Published: December 2019

Abstract
Over several decades, many physics teachers have taken a crucial responsibility for improving conceptual understanding of students. To enhance students’ understanding, generally they have adopted an alternative teaching approach to classes. However, such that approach does not always yield positive learning outcomes. Many researchers reported that a teaching and learning sequence was one of the essential factors needed to take into account. In this study, the teaching and learning sequence was proceeded by 5E inquiry-based learning which was grouped as active learning. Therefore, the goal of this study was to analyze the teaching and learning sequence for Newton’s third law designed by a pre-service teacher together with the physicists’ comments on that sequence. This was viewed as the initial phase of research in finding a suitable framework for future training pre-service teachers about how to design a teaching-learning sequence. The teaching and learning sequence was implemented to the two classes of grade 9 students. From the analysis, we found that the teaching and learning sequence were complicated and some physics situations were not clear. To help support the students’ conceptual understanding, all unclear physics situations were refined and corrected in line with physicists’ comments to be used in the classes but remained the primary structure of such that designed sequence. The standardized test about force was administered to the students after completing the lesson. The results were found that the designed sequence yielded low learning outcomes even were taught with the interactive engagement. This was the evidence shown that the teaching and learning sequence affected students’ leaning and there was a need about seeking a framework to help pre-service teachers in a process of designing a teaching and learning sequence.
The projectile tube experiment for improving high-school physics conceptual understanding
Authors: Rachniyom S , Sujarittham T , Wuttiprom S 
Published: December 2019

Abstract
This research aimed to design the simple apparatus to improve students’ conceptual understanding in projectile motion. The projectile tube experiment was a simple apparatus that consisted of a one-meter PVC tube, a 1200-watt hair dryer, a hard sheet of paper, and a ping pong ball. The participants were 30 grade 10 students who were selected by non-random sampling in the second semester of the academic year 2018. The research tools consisted of learning lesson plans and a multiple-choice learning achievement test. The class activity was conducted by using the Interactive Lecture Demonstrations (ILDs) method with Tracker Video Analysis. The results showed that the experiment set worked perfectly and could be used for learning the projectile concept. The students’ achievement score was significantly increased at a statistical level of .05 and the average of students’ normalized gain was in a medium gain regime.
Testing of car speed approximation equation from yaw mark using radio control car simulator
Authors: Pengyot A , Nanthanasit P , Wattanakasiwich P 
Published: December 2019

Abstract
In forensic science, yaw mark is one of the interesting evidences from the traffic accident. It caused by a vehicle wheel slides on the surface of the road when the speed before braking of the vehicle is high enough. Therefore, prediction of the vehicle speed is important to compare with the legal maximum speed. This research focused on the simulation of a car’s braking on a curve using the radio control car. High-speed video and Tracker Video Analysis (Tracker) software were used to investigate the positions and speeds of the radio control car. The braking path from Tracker software was assumed as the yaw mark in the real accident scene. The equation of the braking path was investigated using the total least-squares spiral curve fitting. The speeds of the car for each position of the braking path were calculated by the method from Daily’s research and the new method modified from Daily’s research. The predicted speed was compared with the one measured from Tracker. The results were similar at the beginning of the braking path, but increasingly different when the speed of the radio control car decreased. Moreover, the modified Daily’s method can investigate the speed better than the Daily’s method for the speed based on a clothoid spiral fitting and Archimedean spiral fitt ing. Findings from this study can be used to develop instructional materials for intermediate mechanics to demonstrate a real application.
Determination of radiation attenuation coefficients of BaSO4/PVC and BaSO4/PS for X-ray shielding
Authors: Jaiyen S , Phunpueok A , Thongpool V 
Published: December 2019

Abstract
The X-ray radiation shielding properties of PVC and PS containing BaSO4 at different concentrations were investigated using the beam transmission method for X-ray tube with a CdTe detector. The mass attenuation coefficients (μm) of these shielding materials were calculated. It was found that the μm increased with the increasing of BaSO4 content up to a value of 60% by weight. The highest value of mass attenuation coefficients at 50 kV tube voltage was 5.985 cm2/g for the BaSO4/PVC sheet and 3.991 cm2/g for the BaSO4/PS sheet. The μm values were compared between BaSO4/PVC and BaSO4/PS. The results showed that BaSO4/PVC had better X-ray shielding performance than that for BaSO4/PS.
Study on gamma-ray shielding properties of lead tellurite glass systems using PHITS
Authors: Sriwunkum C , Nutaro T 
Published: December 2019

Abstract
The gamma-ray shielding properties, mass attenuation coefficient, mean free path and half value layer of lead tellurite glass systems were investigated in the photon energy range of 0.015–15 MeV using particle and heavy ion transport code system (PHITS) with the use of narrow beam transmission technique. The gamma shielding efficiency of studied glass systems was compared to that of standard concretes in terms of mean free path and half value layer. The obtained results show that PHITS is very capable for investigation of radiation shielding properties to good accuracy with maximum percentage differences of less than 2% comparing to the results by XCOM database. This will make a useful alternative technique for studying radiation parameters of other glasses, for which no experimental results are available.
Preparation and thermochromic behaviors of polydiacetylene/indium or gallium doped zinc oxide nanocomposites
Authors: Htet Htet Lynn Tin , Jaisutti Rawat , Tivakornsasithorn Kritsanu , Traiphol Rakchart , Osotchan Tanakorn 
Published: December 2019

Abstract
Polydiacetylene (PDA) is one of the well-known thermochromic materials having a high potential in applications such as displays and sensor technology. Many research groups have been working on controlling thermochromic reversibility of PDA-based materials. In this research, the colorimetric response of PDA assembled with indium or gallium doped zinc oxide was studied with various concentrations. Indium or gallium doped zinc oxide was prepared by hydrothermal method. The compositions of 5, 10, and 15% of indium and 5, 12, and 24% gallium, respectively. Undoped zinc oxide and gallium doped zinc oxide exhibited the nanoflowers composed of nanosheets while the indium doped zinc oxide showed the nanorod structure and combined to be nanoflowers. Monomer of PDA composing 10, 12-pentacosadiynoic acid in ethanol was mixed with indium and gallium doped zinc oxide precursor solution at 20% weight. Ultra-violet light source was used to photo-polymerize for five minutes after incubation at low temperature for a prolong cooling. For nanocomposites of poly(PCDA) and undoped and gallium doped zinc oxide, the color of nanocomposite changed from blue to light-purple at above 70°C and the color can be reversible when cooling down to room temperature. However, for nanocomposites of PCDA and indium doped zinc oxide, the color change from blue to light-purple at above 50°C then become red than those in gallium doped PDA nanocomposite. In addition, the color of PCDA nanocomposite with indium doped zinc oxide cannot be reversible back to the original color.
Calibration of pyroelectric infrared detectors using a light bulb as a black body radiation source
Authors: Pakluea S , Jitvisate M , Rimjaem S 
Published: December 2019

Abstract
The pyroelectric detector is used for measuring infrared radiation. It has uniform response covering wide wavelength from 0.001 µm to 1000 µm and can measure the high-power level of radiation at room temperature operation. In this research, we calibrated the pyroelectric detector by using a tungsten light bulb as an infrared source. Properties of blackbody radiation from the light bulb are investigated. The interested properties include the spectral distribution and the relation of radiation intensity to heating temperature. The most radiation emitted from the light bulb lies in infrared wavelength. The pyroelectric detectors were calibrated against a pyroelectric Joulemeter with known responsivity. The results of this study will be applied to the measure of the radiation produced from the accelerator-base radiation source at the PBP-CMU Electron Linac Laboratory.
Effect structure in physics and hints to economics equation of state
Authors: Gumjudpai Burin , Sethapramote Yuthana 
Published: December 2019

Abstract
We point out that, there is effect structure in physical laws which is noticed from both phenomenological and postulate points of view. Here we consider effect structure in equations of state (EoS). Effect of one variable to the other variables are expressed as a diagram. Formal criteria to judge a status of EoS of an empirical relation is proposed here for classifying the EoS into classes. The framework shades light on testing of existence of an EoS in economics system. Demand-side EoS in perfect-competitive market is proposed employing hints given by the criteria. The demand-side EoS turns to be new class of EoS.
Effect of using geopolymer flyash on torsion capacity of hybrid high-strength reinforced concrete beams containing fine and coarse aggregates substitution which added iron ores as filler
Authors: Aulia T B , Muttaqin M , Afifuddin M , Zaki M , Nastiti G 
Published: December 2019

Abstract
High demand for advanced infrastructure leads to the use of high-strength concrete. Complex, futuristic and asymmetrical building construction may create dangerous torsional load and moment, mainly due to earthquake. Using large amount of cement makes high-strength concrete not environmentally friendly. The use of natural aggregates continuously reduced its availability. Efforts to substitute cement and aggregate from abundant and environmentally-friendly natural materials could be smart solution. This study aims to analyze the torsional capacity of high-strength cantilever reinforced concrete beams having L configuration with a torque arm. Three hybrid beams were cast with substitution of 15% coal flyash (CFA), 15% palm oil blast furnace slag (POSFA) and 10% pozzolanic flyash (PFA) from cement weight, added with 10% pozzolanic sand as fine aggregate substitution and 40% palm oil blast furnace slag as coarse aggregate substitution. One beam without flyash and aggregate substitution (NPBHSC) was tested as comparison. All four beams added with iron ore as filler. The best torsion capacity achieved by PFA beam with maximum load (P) 2.83 ton, maximum torsion moment (M) 10.4 kNm, maximum torsion angle (Θ) 0.0225 rad, ductility (µ) 3.941 and cylinder compressive strength (σ) 59.48 MPa, when compared to NPBHSC beam which produced P = 2.65 ton, M = 9.638 kNm, Θ = 0.0069 rad, µ = 1.008 and σ = 44.40 MPa. POSFA beam followed then by CFA beam resulted in slightly smaller P and M, but generated greater σ, Θ and µ than NPBHSC. It can be concluded that geopolymer flyash can increase compressive strength, torsion capacity and ductility of high-strength reinforced concrete beams.
Plumbing work competence instrument in the field of civil engineering
Authors: Arthur R , Rouf F A , Rahmayanti H , Maulana A 
Published: December 2019

Abstract
Plumbers determine the quality of water installations, networks, and management so that the position of plumbers becomes important in maintaining the health of the environment and buildings. This research was conducted with the aim of measuring the validity of plumber’s competency instruments. The research method used is descriptive by involving several expert judgments. The results obtained show that the competency plumbers instrument needs to be thoroughly improved both the content, constructs, and criteria, which are adjusted to the development of the labor market and current industry needs.
Modeling the potential accidents at the guarded railroad crossing line Surabaya–Lamongan
Authors: Luthfiyani F P , Suprayitno H 
Published: December 2019

Abstract
Traffic safety at railroad crossings considered poorly understood by the road users. A good safety understanding at railroad crossings is necessary to prevent potential accidents. This condition is possibly achieved if factors causing the accidents are clearly known. This study aims to find out factors with potentially causing accidents in a railroad crossing, especially related to traffic volume, vehicle queue length, past year accidents, and land use around the railroad crossing. Data were collected from the data inventory survey, which was then analyzed using regression analysis. The results found three equations types based on the land use, respectively as: Type 1 (Railroad Crossing-Local Road/Collector) Y = 0,97 + 2,89x1 + 0,042x2; Type 2 (Railroad Crossing-Public Facilities) Y = 0,693 + 4,4x1 + 0,006x2; Type 3 (Railroad Crossing-Approaching Intersection) Y = -0,209 + 3,140x1 + 0,018x2. This study was benefited to design the policy as well as the layout of railroad crossings in order to minimize the potential accidents in the railroad crossing areas.
Development of communication competency for civil engineering students
Authors: Saleh R , Widiasanti I , Hermawan H 
Published: December 2019

AbstractThis study is specifically aimed at: (i) assessing the communication competencies of engineering students; (ii) identifying important communication skills needed for engineering students; and (iii) ensuring the types of effective teaching and learning activities to develop communication skills of engineering students. The implementation of the study refers to this quantitative-descriptive approach presenting a survey which includes the main activities, namely literature study, primary data collection and analyse, conclusions and recommendations formulation. Analysis is carried out based on information obtained from respondents. Furthermore, data processing is done by using descriptive methods that provide simple and understandable data presentation for the reader by describing or giving information about a data or situation or phenomenon. The survey findings indicate the adequacy of communication training from a curriculum that integrates communication in various core civil engineering courses. The results of the study also showed that team work and oral presentations were the most important factors for civil engineering students and for their future career development. They also place the greatest emphasis on teaching and learning activities that aim to prepare them to take part in the industrial world later.
Design of production control board for make to order home industry
Authors: Mauluddin Y , Chandrahadinata D , Hakim B L , Maulana A A 
Published: December 2019

Abstract
This study discusses the design of a production control board in the home industry. The home industry that implements a response strategy to consumers makes to order, and a production system strategy is a flow shop. The design of the production control board is intended as a tool to see when an order starts and finishes, the position of the order when to accept orders, and the production capacity owned. A home industry that is the object of research is the bag home industry. The research methodology is a case study, and the model used is a modification of the Gantt chart. The design results show the production control board can work as a tool in planning and controlling production activities.
Optimization analysis of route determination and trash distribution policy in Garut City
Authors: Taptajani D S , Aulawi H , Mauluddin Y , Cahyadi U 
Published: December 2019

Abstract
This study sought a solution to the problem of garbage collection and finding the optimal garbage distribution route starting from the Temporary Waste Disposal Site (TPS) to the Final Disposal Site (TPA) using available vehicles based on the capacity spread in each polling station. This study proposes an optimization formulation to model VRP; shipping is divided into several locations to determine the minimum distance route. The first stage optimally determines the transient trash collection points that cover all aspects of the city area. The second stage applies the Saving Matrix method, where this method is used to find the distance from each destination by minimizing the length taken in the process of distributing waste from each polling station to the final destination of the landfill. This research contributes to modelling the VRP in current conditions and introducing heuristic methods to solve problems efficiently. This study is significant to do to apply the basis for understanding the possibility of increasing service levels in the distribution process of the municipal waste collection.
Controlling sugar raw material supplies in the bottled beverage industry
Authors: Willyanto W , Sembiring A C , Sanjaya A 
Published: December 2019

Abstract
The right inventory of raw materials will minimize optimal inventory costs. A company that produces bottled beverages in Medan has problems in procuring raw materials, especially sugar, which results in high inventory costs. Therefore, this study will calculate the order of requests using the Economic Order Quantity (EOQ), Period Order Quantity (POQ), and Min-Max. The EOQ method was chosen because it saves storage costs and ordering costs. The data analysis technique in EOQ method is calculating the optimal amount of raw material purchases, the optimal ordering frequency, the message costs, optimal cost savings and total cost of raw material inventory. EOQ method turned out to have a lower total inventory cost compared to the cost of procurement of raw material supplies set by the company, which is Rp. 215.862.536 while the EOQ method is Rp. 210.777.546. From the calculation results, the EOQ method is more efficient, because the company will be able to minimize the total inventory cost of Rp. 5.084.990 or 2,4% lower.
The effect of drilling mud on hole cleaning in oil and gas industry
Authors: Wastu A R R , Hamid A , Samsol S 
Published: December 2019

Abstract
The primary function of drilling mud is to lift the drill cut and to avoid problems in drilling hole. The purpose and objective of this study are to determine the ability to lift cutting in oil drilling wells. The method in the cutting process can use in three ways, first is Cutting Transport Ratio (Ft), Cutting Concentration (Ca), and the last is Cutting Carrying Index. The three methods have a standard that must be considered. Drilling mud affects the penetration rate during drilling activities. In drilling operations, a high penetration rate is always desirable. Mud pump as a tool for flowing mud into the wellbore affects the speed of the fluid flow of the mud in the annulus, the flow pattern in the mud circulation, and the ability to lift the cutting in the well while the mud pump specification determines the significant flow rate to circulated in the drilling process. The value of rheology of mud such as plastic viscosity and yield value of mud density also affect the performance of the slurry to become a medium for lifting drill cut. The three methods have a standard that must be considered. Cutting Transport Ratio (Ft) must have a value of > 90%, for the cutting concentration (Ca) method must have a value <5%, and cutting carrying index (CCI) has a value of 1.
High production improvement using channel fracturing in a tight conglomeratic sandstone reservoir
Authors: Sitaresmi R , Oetomo H K , Kartiyasa F A 
Published: December 2019

Abstract
A novel method of hydraulic fracturing is by pulse pumping proppant into formation. The proppant is mixed with fibrous material, and this material will hold the formation from closing, even though channel if formed in the formation. A well producing from poorly sorting conglomeratic reservoir with secondary porosity and muddy micro-porosity. The well recently only produces intermittently 9 to 20 BOPD on sucker rod pump. Well permeability is 1.78 mD with reservoir pressure of 1188 Psi. The first step is to further evaluate the well, from rock mechanic and stress of formation, which is called Candidate Selective Factor (CSF). And then, a fracturing operation is designed, based on well parameter and surrounding wells. After performing pre-fracturing; consists of breakdown test, step rate test, and minifrac test; the operation is re-designed. The re-design includes special pulsing pumping technique, and the mainfrac operation. In the actual operation, the proppant was pulsing into formation for eleven times. The results of after channel fracturing shows that the productivity index increases 10.3 times. This new hydraulic fracturing method; Channel Fracturing; will also give less possibility of screen out, in addition to its successful result.
The role of module quality, learning methods, and lecturers with student learning outcomes: Model multiple regression SPSS approach
Authors: Sriyanto H , Masrukhin A 
Published: December 2019

Abstract
The improvement of learning modules Quality, learning methods, and lecturers contribute significantly to student learning outcomes. This study aims to identify the most significant factors related to module quality, learning methods, and lecturers to improve student learning outcomes and how much they influence. Our essay used combination methods (Mixed Methods) qualitative and quantitative with cross sectional approach with respondents and resource persons from lecturers and students of Bina Nusantara University 143 people from various study programs. Data analysis used model multiple regression SPSS 16.0. Overall the findings show the effect of learning system innovation and the development of learning modules, learning methods and quality of lecturers on student learning outcomes. We used the same research toolalsoto show that the number of students in one class also has an impact on student learning outcomes