bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stress Analysis of HCPB BB under Ex-Vessel LOCA Condition
Authors: Dai Mengdi , Wang Xiaomo 
Published: November 2021

Abstract
Helium Cooled Pebble Bed Breeding Blanket (HCPB BB) is a kind of concept for the European demonstration fusion reactor (DEMO). The blanket attachment system plays an important role in the mechanical connection of the BB and vacuum vessel. Typically, the mechanical and thermal loads should meet the requirement to avoid collapse of the system with off-normal conditions, e.g., under ex-vessel Loss of Coolant Accident (LOCA. This paper investigates the loading requirement corresponding to the maximum stress that can sustain to avoid the LOCA condition. Firstly, a model of the BB is constructed using SolidWorks. Then, stress analysis is carried out based on the cross section of the blanket. Through simulation, the critical condition for the LOCA case and the maximum stress value for the model are obtained. According to the relevant size dimension from the reference, the blanket’s cross section is drawn, and one can get the stress field under the ex-vessel LOCA through stress analysis. The stress distribution under the ex-vessel LOCA condition is simulated to find out the maximum stress field that the blanket can sustain through this paper. The significance is to predict the possible conditions leading to an accident and find possible methods to avoid them.
Stability analysis of microgrid inverter off-grid mode considering nonlinear load
Authors: Shi Xiaoyan , Wang Bin , Yu Shuijuan 
Published: November 2021

Abstract
With the large-scale utilization of distributed generation in microgrid, inverter as the connection hub of new energy grid connection, directly affects the operation performance of microgrid. In order to improve the output voltage quality and load capacity of the inverter in the off-grid mode of distributed energy, the stability region of the inverter with load is analyzed by using the impedance analysis method of cascade converter and control theory. The quasi proportional resonant (QPR) double loop control is adopted to realize no static error tracking voltage while increasing bandwidth, and the influence of control parameters on performance is analyzed. At the same time, in order to improve the capacity of inverter with nonlinear load, odd harmonics are introduced into the controller to suppress the influence of low harmonics of load current on output voltage. Finally, the influence of inverter output impedance change, load level, controller parameters and filter parameters on system stability is analyzed through impedance ratio Nyquist curve, which provides corresponding theoretical support and parameter optimization reference for the design of actual system.
Experimental study on pore forming characteristics of simulated hydrate broken by high pressure water jet
Authors: Dai Zijian , Liao Hualin , Yang Ke , Sun Feng 
Published: November 2021

Abstract
Natural gas hydrate is a research hotspot at present. However, the current exploitation technology can’t meet the demand of commercial exploitation of natural gas hydrate. In order to improve the efficiency of hydrate production, this paper believes that the idea of using high-pressure water jets for sandblasting perforation is expected to constitute an effective way to extract natural gas hydrates. The experimental study on sandblasting perforation and hydraulic slitting of simulated reservoirs was carried out by using large-scale ground fracturing equipment and full-scale hydraulic blasting perforating equipment. The driving pressure is analysed under the action of high-pressure water jet. The influence of diameter on the effect of simulated reservoir fracture. The results show that the diameter of the perforation increases with the increase of pressure; This experimental study can provide an experimental basis for the use of abrasive jet blasting perforating technology to improve the efficiency of natural gas hydrate production.
Study on impulse and ablation of aluminum irradiated by millimeter spot of short pulse laser
Authors: Li Mingyu , Ye Jifei , Mao Chentao , Wang Sibo , Yu Chenghao 
Published: November 2021

Abstract
Aluminum is a high performance working medium for laser ablation micro propulsion. In order to study the propulsion performance and ablation of aluminum under millimeter light spot irradiation, a short pulse Nd: YAG laser with wavelength of 1064nm and pulse width of 8NS was used to irradiate aluminum target in atmosphere. The impulse, the impulse coupling coefficient and the ablation morphology of the aluminum target produced by 6 kinds of millimeter-level light spots are measured. The experimental results show that when the spot diameter reaches 6-7mm, the increasing trend of impulse and impulse coupling coefficient of aluminum target with the increase of laser energy slows down; A large number of ablation products began to accumulate on the surface of the target pit.
Numerical simulation of the effect of different NaCl concent on boiler flame combustion process
Authors: Cheng Zhihai , Wang Jiahao , Han Xinhai 
Published: November 2021

Abstract
Zhundong coal has been widely concerned because of its high alkali metal content, which brings great danger to the combustion of boiler. Therefore, it is extremely necessary to study the laws and characteristics of alkali metal influencing combustion in the burning process of zhundong coal. A gas-solid two-phase flow combustion model of pulverized coal containing NaCl was established by using Fluent software and FactSage software in a hot experimental combustion furnace. The influence of different NaCl content in pulverized coal on pulverized coal combustion process was discussed. The results show that with the increase of NaCl content in pulverized coal from 0 to 1% and 2%, the flame center temperature in the furnace increases about 80°C and 120°C under the same coal content, so it can be concluded that the increase of NaCl content can promote the combustion process of pulverized coal in the furnace. At the same time, it can be calculated that, with the increase of NaCl content, the flame range of the combustion region inside the furnace increases by 1/3. Because NaCl is decomposed by heat during combustion to help combustion, and the radiation heat transfer increases, the flame radiation range inside the furnace will increase.
Experimental Analysis on Mechanical Properties of Aluminum Conductor Steel-reinforced for Transmission Line
Authors: Li Xing , Zhang Jian , Wang Haochen , Liu Chuanbin , Liu Yuhui , Guo Chenrui 
Published: November 2021

Abstract
Under the background of “carbon neutralization”, the power transmission quality of power grid transmission lines becomes more and more important. This paper discusses the mechanical properties of aluminum conductor steel reinforced(ACSR), the main medium of electric energy transmission. This test simulates the real environment, takes the stress-strain curve and elastic modulus as the starting point, divides the test process into four stages, and compares the mechanical properties of the same conductor under different loads in detail. On this basis, the data difference and performance comparison of three different sections of ACSR are obtained. Finally, the commonness and difference of different cross-section conductors are analyzed, and the precautions in the test process are given. The conclusion of this paper can promote the quality improvement of power transmission conductors.
Research and Design of X-band Low Noise Amplifier Based on CMOS Process
Authors: Ma Chao , Wu Hongjiang , Lu Xudong , Sun Haitao 
Published: November 2021

Abstract
Based on CMOS process, a low noise amplifier(LNA) operating at 7.4GHz~11.4GHz was designed. The two-stage differential cascode structure is adopted. Transformer was used to achieve inter-stage matching. Balun was used to achieve input and output matching, which reduces the number of inductors used, effectively reduces the chip size while ensuring good gain and noise figure. The actual measurement results show that the power gain at the center frequency of 9.4GHz is 27dB, the maximum noise figure is less than 3.82dB, the output power 1dB compression point is greater than 8dBm, the chip area is only 0.41mm×0.83mm(excluding PAD).
Numerical Simulation Research on Inter-electrode Capacitance of High-power Electronic Tetrode
Authors: Luo Yongjie , Yang Puqiong , Wu Honghu , Chen Wenbo , Zhong Haoran 
Published: November 2021

Abstract
High-power electronic tetrode is the RF wave transmitting component in the ion cyclotron range of frequency (ICRF) heating system in EAST. In high-frequency use, its inter-electrode capacitance is an important factor that cannot be ignored, which will have a significant impact on the operating frequency and output power. Based on the theory of electrostatics and considering the influence of each electrode, this paper established a three-dimensional solid model of the electronic tetrode, and the numerical simulation about the inter-electrode capacitance is calculated by the finite element software COMSOL. The obtained inter-electrode capacitance simulation calculation values are all within the actual test value range. On this basis, the relationship between the inter-electrode capacitance and the inter-electrode distance is studied, and the adjustable range of the electrode diameter is calculated. The finite element numerical simulation method calculated the inter-electrode capacitance of high-power tetrodes and the quantitative relationship between the inter-electrode capacitance and inter-electrode distance more accurately, which can provide a reference for the simulation and design of megawatt-level electronic tetrodes in the future.
Identification of Crustal Thickness in Central Part of Sumatra Using Teleseismic Receiver Function Method
Authors: Ariyanto P , Atthonthowi M D , Pranata B , Prayitno B S 
Published: November 2021

Abstract
The Central part of Sumatra is a region that has a high potential for earthquakes. This research intended to determine the crustal thickness of the earth, P and S wave velocity profiles, and vp/vs value in the Central part of Sumatra using stacking H-k and inversion techniques based on the analysis of receiver function. This study utilized teleseismic earthquake data with a distance of 30° to 90° from the station and magnitude more than 6 (M>6). The stations used in this study were 3 BMKG broadband stations located in 3 zones, the fore arc ridge zone (SISI), the volcanic zone (PLSI) and the back arc zone (TPRI). The crustal thickness varies in the fore arc ridge zone (SISI) estimated 17.8 km, volcanic zone (PLSI) reaches 29.7 km and the back arc zone (TPRI) reaches 34 km. The crustal thickness is quite thick under the PLSI and thicker beneath TPRI station. These possibly due to the effect of topography and isostatic compensation in the station. However, whether there is a correlation between crustal thickness and topography needs further research using more stations. The highest vp/vs value was found in the volcanic zone of 1.9, that might be associated with the presence partial melting beneath the station. Meanwhile, the vp/vs value in the back arc zone is 1.72, indicating a relatively more homogeneous structure.
Optical Power Splitter Based on Single Mode Directional Coupler Waveguide Using SnO2 Nanomaterial
Authors: Khoiro M , Asnawi  , Firdaus R A , Bustomi M A 
Published: November 2021

Abstract
Optical power splitter based on waveguide had been simulated numerically using Finite Difference Beam Propagation Method (FDBPM). Proposed waveguide was designed in the form of simple directional coupler waveguide. The waveguide was contained SnO2 nanomaterial as film or the guide part and the other supporting material as cladding with lower refractive index such as flint glasses. The waveguide used 2 μm of width to establish single-mode waveguide. The structure of waveguide is divided into three parts such as input, coupling and output part. While the waveguide was modified with angle in input and output parts to avoid coupling between waveguides. Furthermore, the proposed waveguide was analysed by varying the angle and coupling length. The analysed result shows that the waveguide has best performance in angle of 0.5 degrees and coupling length of 300 μm when the propagation loss was around 0.53%. Using the parameter, the output distribution percentage of waveguide approached 55%:44.5%. This performance indicated that the proposed waveguide can be used as optical power splitter. The application is very useful for optical telecommunication networking development.
Synthesis of Nanofiber Polyvinyl Alcohol (PVA) with Electrospinning Method
Authors: Kusumawati D H , Istiqomah K V N , Husnia I , Fathurin N 
Published: November 2021

Abstract
PVA nanofibers are PVA solution-based nanofibers. PVA solution is a synthetic polymer that is non-toxic, soluble in air, and has excellent thermal, gas permeability, and chemical resistance qualities. Nanofibers were synthesized using PVA (Polyvinyl alcohol) solutions at concentrations of 8%, 10%, and 12%. The electrospinning method is used in this investigation, with input voltages of 17 kV and 20 kV, needle distances of 7 cm, 10 cm, and 15 cm from the collector, and a flow rate of 5 ml/hour for each concentration. An optical microscope was used to examine the nanofiber synthesis results in order to assess the morphology and diameter of the fiber. PVA nanofiber with the best fiber from electrospinning has a diameter of 1.06 μm and homogeneous fiber without beads is a synthesized nanofiber with a variation of 10% PVA solution concentration, 15 cm distance from the syringe needle to drum collector, and 20 kV voltage.
Effects of Sintering Temperature and Holding Times on the Microstructure and Chemical Bond of Strontium Titanate (SrTiO3)
Authors: Hikmah D N , Sandi D K , Nurosyid F , Iriani Y 
Published: November 2021

Abstract
Strontium Titanate (SrTiO3) is one attractive material studied. In this study, SrTiO3 has been fabricated via the co-precipitation technique. The samples were sintered at 800°C and 900°C with holding times of 2 h and 4 h for each temperature. The purposes of this study were to synthesize SrTiO3 material using co-precipitation technique and to observe the microstructure and chemical bonds of the SrTiO3 as the variations of the sintering temperatures and holding times. According to the X-Ray Diffraction (XRD) results, the sintering temperatures and holding times influenced the intensity values and peak broadening. The alteration in both parameters consequently changed the crystallite size and lattice strain of the SrTiO3 material. Furthermore, the Fourier Transform Infrared (FTIR) results validated the SrTiO3 material by existence of Sr-Ti-O chemical bonds. Also, the absorption peaks of O-H, C-H, and C=O chemical bonds in the SrTiO3 declined due to the higher temperature and longer holding time demonstrating impurities declined. Therefore, according to this study, the sintering temperature of 900°C and the holding time of 4 h was the best parameter for fabricating SrTiO3 powder.
Study of Electrical and Thermal Properties of PVA-Nanosilica as A Candidate for Supercapacitor Separators
Authors: Hidayati N , Munasir  
Published: November 2021

Abstract
Separator in the supercapacitor that separates the cathode from the anode has an important role in a supercapacitor circuit. Polyvinyl Alcohol (PVA) is a substitute for polyolefin which is commonly used as a supercapacitor separator and PVA has more environmentally friendly properties. The addition of silica dioxide nanocomposites is useful for adding thermal stability and electrical insulators. The method used to make the separator is quite simple, namely by casting a PVA gel membrane with nanosilica on a glass plate and drying it at low temperature. PVA membrane with nanosilica variations different precursors are from sand by coprecipitation method and from TEOS. The properties of the two samples were characterized by scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), and LCR meter. Nanosilica derived from sand and from TEOS have no much different characteristic.
STEM in Disaster Learning Media: A Literature Review
Authors: Agusty A I , Alifteria F A , Anggaryani M 
Published: November 2021

AbstractWhat is a natural disaster? How much do we know about it? Modern technology undoubtedly helped people learn about natural phenomena that sometimes can be misdirected into disaster. Natural disasters can cause quite an enormous impact, such as property damage and the number of injured or dead victims. Disaster education that applied science, technology, engineering, and mathematics could be a potential strategy to prepare the local community in managing the risk of natural disasters. This study is part of literature research on the integration of STEM in disaster education focused on disaster learning media to increase students’ awareness of disaster prevention, impacts, and mitigation. This study aims to identify national and international journals related to STEM, disasters, and learning media; and evaluate the effectiveness of implementing STEM integrated learning media. In 2011-2021 there are 305 publications and 15 articles reviewed in this study. The results indicate that STEM-based disaster learning media can develop students’ ability to solve problems related to disaster mitigation and disaster knowledge. The development of learning media to teach disaster education need to be reviewed and adapted to the geographical conditions of Indonesia, several topics about disaster as recommendation for learning is disaster that often afflict Indonesia.
Research on Physics of Photography: A Bibliometric Study (2000-2020)
Authors: Suprapto N , Kholiq A , Prahani B K , Deta U A 
Published: November 2021

Abstract
The purpose of this study is to analyse physics on photography research and see its trends to find the opportunity for further research. A bibliometric analysis was used in this study. The search results from the Scopus database were extracted using the VOS viewer software. A total of 432 documents related to physics of photography were analysed and mapped. The results mapped the trend of documents across years, language, countries, affiliation, type, sources, authors, and key words. The results have also indicated two major clusters and one minor cluster in researching on physics of photography. The first cluster (green colour) was photography as an application. The second cluster (red) was photography specified into high-speed photography and modern photography. The third cluster (blue) was technology of photography in connecting with competition. A proposed model for future research is also illustrated. Thus, it can be an opportunity for further researchers to conduct research related to this area.
Bibliometric Analysis on Online Physics Learning during COVID-19 Pandemic: Contribution to Physics Education Undergraduate Program
Authors: Jatmiko B , Prahani B K , Suprapto N , Admoko S , Deta U A , Lestari N A , Jauhariyah M N R , Yantidewi M , Muliyati D 
Published: November 2021

Abstract
Research will focus on generating a profile of research trends in online physics learning during the COVID-19 pandemic. The main research is bibliometric. Scopus document data collection in August 2021. The 1007 document results with keywords online physics learning. Then focused on 2020 and 2021* as 277 document results of which these 2 years are the COVID-19 pandemic period. In general, the research results show that the COVID-19 pandemic has had a positive impact on accelerating online learning in developing countries. Another finding is online learning which is proven to be effective for improving student learning outcomes in physics learning. Educational transformations today and after the COVID-19 pandemic can occur in online education, changes in learning from home, changes in roles, and approaches. The research implications are supported by recent research: (1) These findings will provide an empirical basis for the development of physics education research, especially online physics learning during the COVID-19 pandemic; (2) Deep learning system, machine learning system, and education computing can still become a research trend in current research, especially in the integration and adaptation in physics learning; (3) Retracing the trend and novelty of physics education research, especially in the physics education undergraduate program.
Elementary School Teacher’s Training and Coaching as Trustees of the National Science Olympiad (OSN) in Surabaya Using Science Practicum at SDN I Airlangga Surabaya
Authors: Asnawi  , Iriyani D , Prakoso T , Setijorini L E 
Published: November 2021

Abstract
The purpose of this community service activity is to provide knowledge and practical science skills to support the National Science Olympiad (OSN) activities for teachers at SDN I Airlangga Surabaya and its surroundings. Based on the questionnaire distributed to the teachers of the SDN I Airlangga Surabaya, it showed that most of the teachers (87%) had never carried out practicum or experimental activities to support the OSN of Science at school. One of the targets to be achieved through this activity is to change attitudes and to increase the knowledge and skills of the SDN I Airlangga Surabaya teachers who have skills in science practicum to support OSN. The training was conducted using lecture methods, slides and videos, question and answer, interactive dialogue, brainstorming and work practices. There are three things that the partners got after holding the training, namely a) Knowledge; it seems that participants have gained new knowledge about the implementation of elementary science practicums after the training, b) Skills; participants seem to have had the skills to carry out practical science activities of elementary school, c) Attitude (behaviour); according to the practicum activities carried out, scientific attitudes were formed by the participants in supporting science olympic activities. In implementing the training, the partners generally have a great willingness and interest to participate on the training.
A Bibliometric Analysis of Minimum Competency Assessment Research with VOSViewer Related to the Impact in Physics Education on 2019-2020
Authors: Suliyanah  , Adelia B D , Jauhariyah M N R , Misbah  , Mahtari S , Saregar A , Deta U A 
Published: November 2021

AbstractThis study discusses the Asesmen Kompetensi Minimum (AKM) or Minimum Competency Assessment using bibliometrics, the top 5 articles and authors. The method used is the literature review using Harzing’s Publish or Perish application on March 9 and 16, 2021, with keywords “Asesmen Kompetensi Minimum” and “Minimum Competency Assessment” from the Google Scholar database and then processed by the VOSViewer application. The data obtained were 593 articles in Indonesian and 507 articles in English. The results of the bibliometric study obtained five clusters in Indonesian and English. Minimum competency assessment in Indonesian relates to eliminating the national exam, while English relates to student readiness. Top authors and articles discuss science learning, learning activities and mathematical literacy analysis skills. The top five articles in Indonesian and English, there is one study on applying minimum competency assessment and literacy skills in minimum competency assessment, which can also increase knowledge of physics in static and dynamic electricity materials. The conclusion obtained is that there is still minimum research on minimum competency assessment. The impact of this research on physics learning can be applied to static and dynamic electricity, and the top articles and authors discuss the discussion of science learning and PISA design in the pandemic era.