bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fabrication of PVA/SiO2 (Nanofiber) Membranes Prepared Using Electrospinning Method for Lithium Battery Separator
Authors: Sania N F , Munasir M 
Published: December 2022

Abstract
Separators play an important role in ensuring the safety of Lithium-Ion Batteries (LIB). This study uses PVA and SiO2 as membrane separators with the aim of increasing membrane porosity, absorption of liquid electrolyte, ionic conductivity and reducing interface resistance, then using the electrospinning method with variations in the composition of PVA/SiO2 (0.5%), PVA/SiO2(1%), PVA/SiO2(1.5%) and PVA/SiO2(2%). The FTIR analysis results contained-OH groups in the PVA material, while bond formation between PVA-SiO2 was indicated by the presence of Si-O-C peaks. The analysis results of the SEM showed that the mean nanofiber diameters for the PVA and PVA-SiO2 membranes (1%, 2%) were 259±18 nm, 227±16 nm, and 200±11 nm. The results of the calculation of porosity and electrolyte absorption: the higher the SiO2 concentration, the higher the porosity and electrolyte absorption value on the membrane. Therefore, the results of the membrane wettability analysis contain PVA and PVA-SiO2 to almost 0° electrolyte. We can say that the membrane is hydrophilic. Electrical Conductivity and Impedance (EIS) are interconnected, and according to theory, the higher the SiO2 concentration, the higher the electrical conductivity value and the lower the interfacial resistance. Based on the above criteria, this material can be classified as a good separator material for Li-ion batteries.
Analysis Multi Representation Ability and Learning Outcomes of Optical Materials
Authors: Sunarti T , Amiruddin M Z B 
Published: December 2022

Abstract
The purpose of this study was to describe students' ability of multi-representation in solving physics problems on optical material and students' learning outcomes in Physics Department, Universitas Negeri Surabaya. This study is quantitative descriptive research. The sample of this research is one class of students in the physics education study program and one class of students in the physics study program who took program courses in the odd semester of 2021/2022. The research data are multi-representation abilities and learning outcomes of optical materials. The test instrument used is based on multi-representation, which has been validated theoretically and is declared valid. The results of the analysis show that students' multi-representation abilities that are quite good are verbal and visual representation abilities, each with a percentage, while the ability to very good representation is a mathematical representation and symbolic. There is no very significant difference between the multi-representation abilities of students in physics education study programs and students of physics study programs. It is hoped that in the future, the results of the study can become information and references for teachers and lecturers in carrying out physics learning on optical material.
Enhancement of microstructure characteristic and dielectric constant of BaMn0.05Ti0.95O3 ceramics
Authors: Suherman B , Nurosyid F , Handoko E , Khairuddin  , Sandi D K , Hasanah L U , Agustina F R , Puspita N F S , Iriani Y 
Published: December 2022

Abstract
Barium Titanate or BaTiO3, a ferroelectric material with good dielectric properties, is widely studied. The performance of BT is influenced by synthesis and doping. Here, Barium Titanate has been doped with Manganese via the co-precipitation procedure sintered at 900°C and 1000°C. The purposes of this study were to examine the microstructure and dielectric constant of BaMn0.05Ti0.95O3 with variation sintering temperatures at 900°C and 1000°C. The testing employed X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), and Resistance Capacitance Inductance (LCR Meter). The XRD data exposed that the crystal size of the BaMn0.05Ti0.9503 sample enlarged from 48.27 nm to 72.41 nm with increasing sintering temperature. The analysis results using FTIR exhibited the existence of Ba-O and Ti-O bonds which confirmed the perovskite structure of BaTiO3. FTIR data also indicated the presence of C-H atomic bonds, which is the peak of impurities in the carbonate phase. The C-H bond vibration decreased at the higher sintering temperature. The dielectric constant value was obtained from the measurements using an LCR meter. In conclusion, increasing the sintering temperature improved the dielectric constant of BaMn0.05Ti0.95O3 from 119 to 386.
Characteristics of Optical Emission Spectroscopy Spectrum on Graphite Deposition Process with Sputtering Method
Authors: Kusumawati D H , Nurhuda M , Santjojo D J D H , Masruroh  
Published: December 2022

Abstract
The deposition process using the sputtering method is a deposition technique that produces a thin layer. The sputtering method can be used with some modifications made to the deposition system. One of the identifications of the sputtering process can be made through the results of the Optical Emission Spectroscopy (OES) spectrum. By analyzing the OES spectrum in the sputtering system, it can be seen the condition of plasma formation in the chamber. The gas used in the deposition system is Argon. By varying the voltage, flow rate, pressure and temperature of the substrate, it is found that argon gas is ionized at a voltage of 140 V, with a flow rate of 60 ml/min, a pressure of 15 Pa and a substrate temperature of 200°C. SEM-EDX characterization of the deposition results showed that graphite growing on the substrate had been identified at around 6.5%.
Digital Learning Integrated with Local Wisdom to Improve Students’ Physics Problem-Solving Skills and Digital Literacy
Authors: Siswanto J , Harjanta A T J , Suminar I , Suyidno S 
Published: December 2022

Abstract
Digital learning integrated with local wisdom is designed to improve students' physics problem-solving skills and digital literacy. The study aims to analyze the practicality and effectiveness of digital learning integrated with local wisdom designed to improve students' physics problem-solving skills and digital literacy. The research was conducted by applying a pre-experimental design, one group pre-test and post-test for 66 high school students. When the learning process is carried out, observe the practicality of learning. The data collected from the pre-test and post-test were analyzed using paired t-test and n-gain. The results show that digital learning integrated with local wisdom is designed to improve students' physics problem-solving skills and digital literacy. It is proven that: it is practical (applicable) which is indicated by each phase that can be implemented by teachers with good categories; and effective in increasing students' physics problem solving and digital literacy, as indicated by a significant increase in physics problem-solving skills and digital literacy at 5%, and the average n-gain is in the medium category.
The Liquifaction Modeling to Analysis of Soil Structure Composition
Authors: Astutik S , Aprilina A N 
Published: December 2022

Abstract
Indonesia is a country that is prone to natural disasters, one of which is liquefaction. The earthquake that occurred in Palu City in 2018 was a tsunami, and the ground moved or also known as liquefaction. The purpose of this study is to analyze the results of modelling the liquefaction potential using a shaking table test tool based on the composition of the soil structure and based on the groundwater level. The type of research used is descriptive qualitative research with modelling using a table test tool. The soil samples used were beach sand and clay soil with dry soil conditions and diameter based on the results of sieve no. 20 with a hole diameter of 0.85 mm. The water volume used is 4 L, 4.5 L, and 5 L. The result of this research is sand soil which is water-saturated soil liquefaction occurs and based on the groundwater level shows sand soil whit a volume of 5L, which is assumed to be a shallow groundwater level experiencing greater and faster liquefaction. One of the factors that occur in a liquefaction area is a water-saturated which has a shallow groundwater level.
Autonomy-Based Creative Learning: Equip Creativity and Concern for Prospective Physics Teachers in Wetland Environments
Authors: Suyidno S , Haryandi S , Mahtari S , Azhari A , Sunarti T 
Published: December 2022

Abstract
Creativity and environmental care in wetlands have received wide attention from the government and researchers in various countries, especially in the industrial era of 4.0. However, both competencies are less familiar in physics learning. Therefore, this study aims to analyze the effectiveness of Autonomy-Based Creative Learning (ABCL) in improving prospective physics teachers' creativity and caring attitude in wetland environments. This research includes development research using the ADDIE model. The implementation test was conducted on 59 physics education students in South Kalimantan (Indonesia), which were divided into three groups. Before and after learning, prospective physics teachers take a creativity test in designing ABCL, then fill out environmental care questionnaires to determine their attitude on preserving the environment’s energy-saving behaviour, managing waste, loving the environment program, and health protocols. The results show increased students' creativity and caring attitude in the wetland environment. N-gain creativity in the medium criteria, while n-gain care for the environment in the standard serial. This creativity is because students initially have a good understanding of environmental care. Thus, this learning is effectively used to equip the creativity and concern of prospective physics teachers in the wetland environment.
Modification of Purun Tikus (Eleocharis dulcis) Long Fiber with Potential as Composite Reinforcement Material
Authors: Haryanti N H , Suryajaya  , Suarso E , Khaipanurani  , Manik T N 
Published: December 2022

Abstract
The choice of natural fiber purun tikus (Eleocharis dulcis) as a composite reinforcement material is related to its benefits, such as low price, abundant quantity, renewable, and environmentally friendly. In this research, the effect of alkalizing treatment and hot water immersion on the properties of purun tikus fiber were investigated. The long fiber of purun tikus measuring 20 cm and diameter < 0.064 cm was modified with 120°C hot water immersion and 5% NaOH immersion for 1 hour each. These treatments were applied to improve the properties of purun tikus fiber, such as their properties of chemical (moisture, lignin, cellulose, and hemicellulose), physical (density), and mechanical (tensile strength). The results showed a decrease in the water content, lignin, cellulose, and hemicellulose of purun tikus fiber, while the density and tensile strength increased after the treatment of 120°C hot water immersion and NaOH 5% alkalization. The NaOH 5% alkaline treatment was better than 120°C hot water immersion in terms of reducing water content, lignin, cellulose, and hemicellulose. Although the tensile strength of the modified NaOH 5% NaOH purun tikus fibers is lower than the 120°C hot water immersion treatment, it was still higher than before the modification. It is shown that these fibers blend well in the manufacture of composite materials and improve their mechanical properties.
The Profile of Misconceptions Using Three Tier Diagnostic Test on Dynamic Fluid
Authors: Aliyah R , Sudibyo E , Suyatno  , Wasis  
Published: December 2022

AbstractDynamic fluids have a stationary flow, where the volume of fluid flowing in each cross-section of the pipe in a specific time interval is the same even though the pipe is widening or narrowing but the fluid velocity is different. When a fluid moves through a section where the velocity and height above the surface change, the pressure in the fluid changes. Understanding led to errors in understanding the concept, so this research was carried out to identify the profile of misconceptions in a dynamic fluid material. Students misconceptions were detected using a three-tier diagnostic test with data analysis using the Certainty of Response Index (CRI). This research is quantitative descriptive research. The respondents of this study were students of class X of senior high school who had received dynamic fluid material. Based on the results of this research, showed that students experienced moderate category misconceptions on dynamic fluid material with the highest level of misconceptions, namely the concept of continuity equation analysis, and the lowest misconception in the analysis of the concept of water flow discharge.
A Comparative Study of The Crystallinity Value of Polyethylene Glycol-Based Composites Using XRD and WAXS
Authors: Fauziyah N A , Perwitasari D S , Fadly T A , Soontaranon S , Pratapa S 
Published: December 2022

Abstract
Crystallinity is an important parameter of thermoplastic polymers. Furthermore, crystallinity is closely related to processing conditions such as temperature and applied shear stress. However, determining the degree of crystallinity is very complicated because of the different interpretations of crystallinity according to each technique. In this paper, we analyze the crystallinity of polyethylene glycol-based composites using two instruments, i.e., X-Ray Diffraction (XRD) and wide-angle X-Ray Scattering (WAXS). The results showed that with the addition of 60 wt.% silica, the degree of crystallinity revealed by XRD was 81.24%, while WAXS showed a degree of crystallinity of 80.93%. In general, the crystallinity results obtained with WAXS were almost identical, only 0.31% different from the XRD results. This difference in results was due to more presence as a consequence of the broad amorphous halo and background instrumentation exhibited by the higher background from XRD. Thus, the instrument effect must first be removed from the XRD data and it is possible that the amorphous region of the sample will also be reduced and result in a slightly higher crystallinity. At the same time WAXS with the transmission technique will minimize the possibility of background instrumentation. Therefore, WAXS was recommended to analyze the crystallinity of polymer-based and amorphous materials.
Microstructure, Chemical Bonds, and Photocatalyst Activity of Neodymium-doped Strontium Titanate (Sr0.97Nd0.03TiO3) with 900°C and 1000°C Sintering Temperature
Authors: Hasanah L U , Agustina F R , Puspita N F S , Suherman B , Nurosyid F , Sandi D K , Iriani Y 
Published: December 2022

Abstract
Strontium Titanate is a perovskite oxide with remarkable properties as a photocatalyst. The synthesis of Strontium Titanate material with Neodymium doping (Sr0.97Nd0.03TiO3) has been completed by means of the co-precipitation procedure. Samples were sintered at temperatures of 900°C and 1000°C for 4 hours to investigate their properties. X-Ray Diffraction (XRD), Fourier-Transform Infrared spectroscopy (FTIR), and UV-Vis Spectrophotometer were employed to observe the microstructure, chemical bonds, and photocatalyst activity of Sr0.97Nd0.03TiO3. XRD data exhibited that the crystal size enlarged from 42.3 nm and 64.4 nm as the sintering temperature increased. FTIR data revealed strong Sr-Ti-O bonds and decreased C-H and C=H bond impurities as the sintering temperature increased. The photocatalytic performance was evaluated with methylene blue (MB) dye degradation by UV light irradiation for 3, 4, and 5 hours where the UV-Vis spectrophotometer tested the absorbance of the degraded MB. The results exhibited that Sr0.97Nd0.03TiO3 achieved the optimal degradation (62.7%) at 900°C and with 3 hours of irradiation.
Optimization of TPACK-based Project Learning in Micro-teaching Courses in Physics Education Study Programs during the Pandemic
Authors: Ekawati E Y , Prastyo A 
Published: December 2022

Abstract
The COVID-19 pandemic requires educators to design meaningful learning strategies that utilize technology, one of which is by implementing a project-based learning model. Advances in 21st-century technology encourage the creation of the TPACK learning approach. Prospective physics teachers need to have TPACK abilities as a provision to become competent physics teachers. This study aims to describe the results of implementing project-based learning models in improving TPACK abilities in physics education study program students in the pandemic era. This research method is Participatory Action Research (PAR). The data collection techniques for this study were observation, interviews, and questionnaires. The results showed that this learning project resulted in a product in the form of a learning implementation plan document and a learning implementation video. The results of implementing the project-based learning model from this research are: 1) students' TPACK abilities are at the exploring level. Students can integrate physics learning with suitable technology. However, students lack the confidence to conclude the evaluation results because learning is not applied in real classes; 2) students can use learning technology well; 3) students can master the learning content well; 4) students are not good at showing pedagogic abilities. Determination of learning strategies can affect students' TPACK abilities. Project-based learning strategies need to provide more stimulus so that TPACK's abilities can be improved, especially in their pedagogical abilities.
Tunable Magnetic State in AA-Stacked Bilayer Zigzag Graphene Nanoribbon by Increasing Thickness
Authors: Prayitno T B , Fahdiran R , Budi E 
Published: December 2022

Abstract
The density functional theory was utilized to investigate the likelihood of a tunable magnetic state in the AA-stacked bilayer zigzag graphene nanoribbon. The non-magnetic ground states at certain thicknesses were found, but then the magnetic ground states at the other thicknesses were observed. This happens by increasing the thickness so that the van der Waals force becomes weak. This creates spin polarization as the bonding between layers can be overcome. The phase transitions of magnetic ground states were also observed at a large thickness as applying the doping. This signified that the new magnetic ground state is still tunable by applying dope.
Prediction of Fluid Accumulation in Engine Disk Cavity Based on Encoder-Decoder
Authors: Li Hongyu , Su Yue , Wang Yankai 
Published: December 2022

Abstract
A neural network model based on the encoder and decoder is proposed for aero-engine fluid accumulation. The model uses the attention mechanism to adjust the output weight of the encoder and then uses the decoder to predict the fluid volume. The vibration eigenvalues were obtained by fast Fourier transform of the original vibration signals, and the eigenvalues of vibration data were used as the input model to predict the volume of fluid in the disk cavity. To evaluate the effectiveness of the model, an aero-engine disk cavity fluid simulation experiment was built, and the data obtained from the experiment were used to test the method and the model. The prediction accuracy of the proposed model for the volume of engine disk cavity fluid was over 95%, which has an important engineering value for the reliable operation of an aero-engine.
Study on Structural Stability of Black Phosphorus/Bismuth Oxysulfide/Tungsten Trioxide Heterojunction Based on XRD Measurement
Authors: He Xinyi , Xiong Yi , Zhao Meng , Zeng Wei 
Published: December 2022

AbstractX-ray diffraction is employed to characterize the black phosphorus/bismuth oxysulfide/tungsten trioxide heterojunction composites to explore the alterations in crystallite size and micro-strain. The sample is immersed in sodium sulfite and tested each week. The Scherrer formula and Williamson-Hall plots are used to explore the effect of black phosphorus on improving the stability of the bismuth oxysulfide/tungsten trioxide heterojunction. The results show that the structure of black phosphorus/bismuth oxysulfide/tungsten trioxide heterojunction has changed as follows. The value of crystallite size of tungsten trioxide decreases from 13.82 nm to 9.23 nm, then to 7.45 nm per week, while the value of compressive micro-strain of WO3increases from -2.02×10−3to -7.58×10−3, then to -8.93×10−3. It illustrates that the lattice constant of WO3is compressed due to the lattice mismatch.
Design of Isolated Voltage Sampling Circuit Based on HCNR201
Authors: Yang Wanyu 
Published: December 2022

Abstract
With the continuous development of new energy technology, the photovoltaic system plays an extremely important role in people’s production and life, and new energy. As an indispensable part of a photovoltaic system, the battery voltage monitoring circuit plays a very important role. The voltage of the photovoltaic battery pack is usually relatively high. To ensure the safety of users and ensure that the controller is not affected by other adverse factors, this paper designs a voltage sampling circuit based on a high-precision linear optocoupler HCNR201. The detection circuit has strong electrical isolation characteristics and can monitor the voltage of two or more battery groups. In this paper, two groups of battery voltage monitoring using simulation and hardware test results proved that the voltage detection method has good linearity, and high accuracy, while the input and output of electrical isolation ensure user safety.
A Comparative Study between Negative & Positive Bias Temperature Instability of Commercial nano-MOSFETs Using Voltage Step Stress Technique
Authors: Li Zhigang , Wei Qinru , Gao Rui , Lin Xiaoling , Huang Yun 
Published: December 2022

Abstract
Bias temperature instability (BTI) has been one of the most common and also severe aging mechanisms in MOSFETs. In this work, a comparative study between NBTI and PBTI of commercial nano-MOSFETs has been conducted using the voltage step stress (VSS) technique, which is implemented by applying multiple constant voltage stress (CVS) continuously on a single device. Aging parameters are extracted for both NBTI and PBTI from a single device using the VSS technique, and the lifetime under room temperature is predicted. This work is of potential use for BTI investigation of commercial nano-MOSFETs in terms of both test efficiency and affordability.
High power non-electrolytic capacitor LED driver with three ports based on energy distribution
Authors: Li Zejun , Zhang Junzhao , Xu Bingshe , Han Xiaoqing , Li Fan , Lu Xiaofeng 
Published: December 2022

Abstract
To eliminate the influence of electrolytic capacitors on the driving life of high-power LED, a three-port high-power LED without electrolytic capacitor driving power supply based on energy distribution is proposed. The energy difference between the input terminal and the output terminal is balanced by the auxiliary DC-DC circuit to reduce the ripple of the output current. The working principle of the topology and switching mode is analyzed in detail. According to the proposed circuit topology, the mechanism of the output current ripple of the low-frequency circuit is analyzed, and a low-frequency ripple control strategy suitable for the circuit topology is proposed. The specific implementation scheme and the key parameters of the circuit design are given, and the model is verified, which proves that the proposed model is feasible.
Analysis of 330 kV B busbar tripping accident in a 330 kV substation
Authors: Jiang Fei , Zhang Zhaoyu , Zhang Suhui , Gao Jian 
Published: December 2022

Abstract
In this paper, the damage to the bus conductor and expansion joint caused by the tripping accident of bus B of a 330 kV line in Northwest China was taken as an example, and the reasons for the tripping accident were analyzed and improvement measures were proposed utilizing macro inspection and cross-cut test. The results showed that the main reason for this failure is that the manufacturer did not strictly implement the coating process, resulting in insufficient coating adhesion, and the coating gradually cracked and fell off during operation. The peeling coating caused air gap breakdown and ground flashover.