bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Fault Prediction Method of VHF Radio Station Based on L-M Algorithm
Authors: Ma Junkai , Wang Xiaoyan , Wang Zeyuan 
Published: October 2020

Abstract
Aiming at the problem of intelligent detection and location of marine VHF radio station fault machine,this paper studies BP neural network algorithm, analyzes the characteristics of VHF radio stations at sea,builds fault tree model, presents an intelligent detection method of VHF radio fault using L-M (Levenberg-Marquardt) intelligent algorithm to design L-M algorithm-based automatic fault detection model for VHF stations. The feasibility and efficiency of L-M algorithm in VHF fault detection are verified by simulation. The results show that: L-M algorithm can identify fault points more quickly and accurately among VHF radio station fault detection methods. Compared with the traditional manual detection, accuracy and efficiency of L-M algorithm are greatly improved.
Design of a fast transfer alignment matching algorithm
Authors: Geng Xingshou , Tang Kanghua , Wu Meiping 
Published: October 2020

Abstract
In order to estimate the misalignment angle of align system effectively, this paper constructs a traditional 14 state rapid transfer alignment model, considers the problem that traditional velocity error definition is not completely accord with the consistency of coordinate system, the improved differential equation of velocity error is applied to transfer alignment, constructs an improved 12 state rapid transfer alignment model. Finally, the performance of the two alignment algorithms is tested by vehicle-mounted experimental data under the conditions of no maneuver, C shape maneuver and S shape maneuver, and the experimental result of the two algorithms is compared and analyzed. The experimental result shows that the improved 12 state rapid transfer alignment algorithm not only has better alignment accuracy than the traditional 14 state rapid transfer alignment algorithm, but also reduces the model complexity, reduces the system calculation, and avoids the influence of flexural deflection and dynamic misalignment angle. The yaw angle alignment accuracy is improved by 45%, 65% and 53% under the conditions of no maneuver, C shape maneuver and S shape maneuver, respectively.
Structural Health Monitoring for Cables with Insulation Layer by Envelope Analysis Based on Ultrasonic Guided Waves
Authors: Yang Xiao , Qu Zhigang , Wang Qiuyu , An Yang 
Published: October 2020

Abstract
Cables play an important role in industries and their insulation layer may experience aging problems, which can lead to serious consequences such as fire. Therefore, monitoring the condition of the cable insulation layer can effectively avoid accidents. In this paper, a structural health monitoring method for cables with insulation layer is proposed, which is based on ultrasonic guided waves (UGWs). In the method the UGWs are generated by MFC transducers and do not affect the normal operation of the cables. When UGWs propagating in the cable encounter defects, the reflected signals appear and can be acquired by the measurement system. The signal received by MFC transducers is processed to extract the characteristics. According to the envelope of received signals, it can be judged whether the current cable insulation is defective. In the experiment, cables in different conditions are tested and defects are successfully detected.
The Grey Forecasting Model for the Medium-and Long-Term Load Forecasting
Authors: Song Feng , Liu Junxu , Zhang Tingting , Guo Jing , Tian Shuran , Xiong Dang 
Published: October 2020

Abstract
Load forecasting plays a particularly significant role in the stable operation of grid and the reasonable distribution of power resources. Based on grey model theory, this paper carries out load forecast of power system. In this paper, the grey model theory is used to realize the medium and long-term load forecasting, and the accuracy of the model to the load forecasting is tested by using the posterior difference method. Finally, an example is given to check the method’s practicability.
Topology design of multi-row series-parallel multi-speed planetary gear automatic transmission based on extended lever method
Authors: Fan Yi 
Published: October 2020

Abstract
With the urgent need of saving energy, reducing emissions, reducing shifting frustration and improving driving quality, the number of gears of automatic transmissions used in automobiles is increasing. However, the traditional lever method is insufficient in designing multi-row parallel-series multi-speed planetary gear automatic transmissions. In this study, an extended lever method is proposed, which can design and analyze the transmission state of planetary gears with multiple input elements, multiple output elements and no fixed elements. Then, based on the extended lever method, a series of multi-speed planetary gear automatic transmissions are designed, among which a twelve-speed planetary gear automatic transmission is selected, and the kinematics and dynamics are analyzed by using the lever method. The results show that the designed twelve-speed transmission has a wide range of speed ratios, with up to seven overdrive gears and a smaller speed ratio interval of each overdrive gear. The results further prove that the extended lever method is an important direction for the design of multi-row series-parallel multi-speed planetary gear automatic transmission.
Experimental analysis of repairing H14 die steel surface by laser cladding
Authors: Xing Wang , Mingming Wu , Jinxia Zhou 
Published: October 2020

Abstract
The damage of die metal parts is one of the key problems that affect its normal use. Laser cladding technology can solve this problem quickly and effectively. In this paper, the tungsten alloy powder was cladding on the metal surface by laser cladding, and the surface repair and strengthening technology were carried out. The influence of laser scanning speed on the microstructure of cladding layer metal was studied. The experimental results show that the metal parts with surface damage are repaired by laser cladding technology, and the cermet protective layer without pores and cracks is obtained. The hardness value of laser cladding layer is greatly improved than that of base material, which lays a good foundation for improving material performance.
Study on pavement performance of basalt fiber asphalt concrete under different pavement environment
Authors: Yan Jingchen , Wang Guilai , Zheng Jianlong 
Published: October 2020

Abstract
In order to study the basalt fiber in the road with the performance, the test of matrix asphalt concrete, basalt fiber reinforced asphalt concrete and the SBS modified asphalt concrete applying ultraviolet aging, high and low temperature alternating cycle change, after the freeze-thaw cycle and salt freezing and thawing cycle road environment for rutting test, low-temperature bending test and immersion Marshall test. The test results show that basalt fiber plays an important role in improving the high-temperature stability, low-temperature crack resistance and water stability of asphalt concrete under different road conditions. The degree of influence of pavement environment on the deterioration of pavement performance of basalt fiber asphalt concrete is as follows: ultraviolet aging > high and low temperature alternating cycle > freeze-thaw cycle > salt freeze-thaw cycle.
Simulating the effects of braced excavation on the adjacent tunnel using numerical method
Authors: Yi Shun , Ke Wenhui , Huang Xiangguo , Xiao Mingzhao , Chen Jian , Huang Juehao 
Published: October 2020

Abstract
It is inevitable that the construction of braced excavation is in the vicinity of existing tunnels. Therefore, it is necessary to assess the influence of braced excavation on the nearby tunnel. Using two-dimensional (2D) numerical method, this study is conducted to investigate the response of existing tunnel induced by overlying excavation. A series of scenarios are carried out, with consideration of relative locations of tunnel with respect to overlying excavation. The results demonstrate that different distortion of the tunnel will occur with the variety of relative locations between the tunnel and the braced excavation. Additionally, the excavation-induced tunnel responses show a decrease trend with an increase distance between the tunnel and excavation. In this regard, the study can provide a useful reference for evaluating the influence of braced excavations on nearby structures.
Determination of Ultimate Load and Stability Evaluation of Transmission Tower Foundation during Operation Period
Authors: Yingbo Zhou , Hang Chen , Qiupeng Zhou , Zhiqiang Duan , Xiaojing Gao 
Published: October 2020

Abstract
500kV transmission tower foundation on the Yanzi landslide is taken as the research object this article. The extreme working conditions of the transmission tower foundation under different operating conditions, including maximum wind speed, icing and disconnection, are determined. Based on this, the stability of the tower foundation, including foundation uplift stability, foundation overturning stability, foundation bearing capacity, is initially evaluated according to the " Code for Design of 110kV ∼ 750kV Overhead Transmission Line " (GB 50545-2010). The results show that when the wind speed is greater than 20m/s, the maximum wind speed is determined as the extreme load condition of the tower foundation. Preliminary evaluation of the stability of the tower foundation shows that its stability is related to the wind speed and the buried depth of the tower foundation. Therefore, the research results can provide technical reference for related power departments.
Primary School Site Selection Research Based on Big Data of Population Density Jintang urban area of Chengdu as an example
Authors: Xiao Hai , Fu Linqin 
Published: October 2020

Abstract
In recent years, big data has been increasingly used in the location of urban public service facilities. This paper takes Jintang urban area of Chengdu as the research object, based on big data of population density, and five factors that affect the site selection of primary schools are studied, including traffic safety, traffic accessibility, existing primary schools, land usage nature, and land price. Spatial analysis methods such as GIS nuclear density analysis are applied to analyze and process related factors. The results show that on the basis of the existing planning and layout of Jintang urban area, the land for education and scientific research on the east side of Jinyuan street, the land for primary and secondary schools on the east side of Jinying road, and the southwest corner of Hantan community are the most suitable plots for primary and secondary schools. Among them, the education and scientific research land on the east side of Jinyuan street serves the most residential sites, which is the optimal plan for site selection for primary schools.
Real-time Insulation Monitoring System for Electric Submersible Pump
Authors: Wang Min , Liu Shenghu , Song Nan , Dang Bo , Ren Zhiping 
Published: October 2020

Abstract
As one of the most important mechanical oil production equipment in the process of oil and gas production, electric submersible pump has a cycle of up to half a year for working. During the operation of the electric submersible pump, the insulation condition of the system will gradually aging, resulting in defects in the system and causing destructive failure. In order to solve this problem, this paper designs a real-time monitoring system for the insulation condition of electric submersible pump, and constructs the indoor well condition simulation experiment. Compared with the existing insulation detection technology, the monitoring technology is simple and does not need professional technical support from inspectors.
2nd International Seminar on Applied Mathematics and Mathematics Education (ISAMME) 2020
Authors: Hendriana H , Hidayat W , Widodo S A , Irfan M , Noto M S , Perbowo K S , Prahmana R C I 
Published: October 2020

Preface

Indonesian education system demands changes due to the dynamic challenges in human resources as the effect of the Industrial Revolution 4.0. As a result, the curriculum set into contemporary literacies: Data Literacy comprises the ability to read and analyze, Technology Literacy includes the ability to apply technology, and Human Literacy aims at creating humanists who can communicate well. This new education system requires professionals who create innovation based on research information. This notion calls for a new perspective converting challenges into opportunities. Thus, the Mathematics Education Department of IKIP Siliwangi and the Indonesian Mathematics Educator Society (I-MES) invite researchers, practitioners, and educators to participate in and contribute to The 2nd International Seminar on Applied Mathematics and Mathematics Education (ISAMME) 2020 under the theme “Issues and Challenges for Applied Mathematics and Mathematics Education in Digital Era.”
This seminar has objectives to expand mathematics contribution to society, improve mathematics teaching, and solve mathematics problems. It was carried out online through the Zoom application with a capacity of 1000 people. The Zoom application is also equipped with a Zoom breakout feature to support the implementation of contribution and streaming sessions on Youtube.
List of photos are available in the pdf.
Profile of mathematical representation ability of junior high school students in Indonesia
Authors: Putra B Y G , Rosita N T , Hidayat W 
Published: October 2020

Abstract
This study aims to determine students’ mathematical representation abilities. The research uses descriptive qualitative method. This ability is addressed after the students have answered five validated mathematical representation problems. The research subjects are 35 students of class VIII in one of State Junior High Schools in Bandung, West Java, Indonesia. The state junior high school is included in the medium level category according to the achievement of the National Final Examination score. The results of this study indicate that students still have difficulty in drawing the graph to solve Two-Variable Linear Equations, students have difficulty in making equations or mathematical expression and students have difficulty in solving and drawing conclusion from the problems of Two-Variable Linear Equation System in text.
The effect of STEM approach on the mathematics literacy ability of elementary school teacher education students
Authors: Kelana J B , Wardani D S , Firdaus A R , Altaftazani D H , Rahayu G D S 
Published: October 2020

Abstract
This study aims to determine the effect of the STEM approach on mathematics literacy abilities of elementary school teacher education students. The method used in this research is pre-experimental with One-Group Pretest-Posttest Design with a population of semester 2 PGSD students with a total of 188 students. The sample in this study was 50 students. The instruments used include: mathematics literacy ability tests, interviews, and observation instruments. The results showed that: 1) there was an effect of the STEM approach on the mathematics literacy ability of elementary school teacher education students; 2) to further optimize learning it must be prepared more thoroughly and planned, 3) the role of educators or lecturers in applying models or approaches must be adapted to the demands of 21st-century skills.
The role of education, values, culture and character in online learning for learning mathematical outcomes of prospective teachers
Authors: Fitrianna A Y , Novtiar C 
Published: October 2020

Abstract
The purpose of this research is to know the relationship between education, value, culture and the character of learning outcomes after online learning. The research methods used are correlational. The population taken is the entire student of the Mathematics Education Study Program IKIP Siliwangi 2018 which takes courses of Linear Program. Sample research was taken with the Purposive Sampling technique as many as 39 students. The instrument used is the test instrument of the study results of linear courses and non-test instruments to view the education response value, culture and character (EVCC) with a scale Likert as many as 30 statements. Stages of data analysis through test normality, correlation analysis, simple regression analysis and coefficient of determination. The results showed that education, value, culture and character significantly influenced the student mathematics achievement of the Linear Program, with its contribution of 13.6%, while the remaining student learning outcomes were influenced by other factors during online.
Mathematical critical thinking skill and self confidence according to student’s cognitive stage
Authors: Yuliani A , Fitriani N , Dahlan J A , Sumarmo U 
Published: October 2020

AbstractThe purpose of this survey is to examine attainment of student’s mathematical critical thinking skill (MCTS) and mathematical self confidence (MSC) according to its cognitive stage. The survey concerns with 36 eighth grade students’, test of logical thinking (TOLT), an essay MCTS test, and a MSC scale. Analysis data of this survey are computation on percentage and testing existancy of association between MCTS and MSC, and analysis rational on other findings. By using TOLT, survey invented some interesting findings among other were: a) 11 % at formal stage, 53% at transition stage, and 36 % at concrete stage; b) The survey detected that mathematical critical skill on formal stage students obtained higher grade than transition stage students and the transition stage students obtained higher grade than the grade of concrete stage students. The survey detected that Mathematical self confidence on formal stage student and transition stages have high mathematical self-confidence compared to students who are still in the concrete stage; c) There is a association between mathematical critical thinking skills with self confidence.
Camtasia-assisted computer statistics application practicum learning video in online classes to improve students’ mathematical understanding
Authors: Sukmawati Sri , Saumi Tia Fitria , Nasrullah Anton 
Published: October 2020

Abstract
The learning environment by relying on lectures and practice in class causes students to have a tendency to forget so that it can cause a lack of understanding ability, in fact, the understanding ability is a learning challenge to face the needs of the industrial revolution 4.0. The purpose of this research is to find out whether the achievement and improvement of understanding of students who learn with Camtasia-assisted learning videos are better than students who learn by not using learning videos. The method used is a quasi-experiment and the design used is a non-equivalent control group design. Samples were taken two classes purposively. The selected research sample consisted of two classes, 32 students from the experimental class and 48 students from the control class. The research instrument used was a comprehension ability test. The results of the study found are the achievement and improvement of understanding of students who learn with Camtasia-assisted learning videos better than students who learn by not using learning videos.
Mathematical disposition ability and critical thinking: Evaluation of middle school students
Authors: Minarti E D , Alghadari F , Hutajulu M 
Published: October 2020

Abstract
This study aims to examine the effect of the mathematical disposition of junior high school students on mathematical critical thinking skills. A quantitative approach with a correlational method used by researchers to examine both variables. Subjects were taken randomly in class. The subjects in this study were 32 students of class VIII in one of the Bandung junior high schools. The results of the study show that the mathematical disposition of junior high school students has a positive influence on mathematical critical thinking skills. Students with a positive disposition toward mathematical learning could interpret and not hesitate to express ideas. More than fifty percent of students who have a positive disposition were able to interpret and analyze the mathematical problem given. The teaching and learning process in this research is limited to circle material in junior high school and eighth grade in one of the junior high schools in Bandung city. There are still many other tendencies besides mathematical disposition, which enable students to have good critical thinking abilities, which affect student learning outcomes, one of that is students who have mathematical abilities that have been held since elementary school. This study shows that there was an influence of students ‘mathematical disposition on their ability to think critically so that to improve students’ critical thinking abilities, positive disposition abilities should be built. The ability to interpret and analyze students develop in line with passion and serious attention in learning, self-confidence, curiosity, and the courage to share opinions.
Students’ critical mathematical thinking abilities through flip-problem based learning model based on LMS-google classroom
Authors: Ramadhani R , Bina N S , Sihotang S F , Narpila S D , Mazaly M R 
Published: October 2020

Abstract
This research aimed to calculate the increase of students’ mathematics critical thinking ability in Senior High School who taught with Flip-Problem Based Learning based on LMS-Google Classroom. This research is quasi-experiment research used pre-test post-test control group design research. Sample in this research is 60 students divided into two research groups, 30 students in the experiment group (taught with Flip-Problem Based Learning) and 30 students in the control group (taught with Problem-Based Learning). The homogeneity test and normality data test used Levenes’ test and Kolmogorov Smirnov test. The result of the homogeneity test and normality data test is homogenous and distributed normally. Based on the result of the homogeneity test and normality data test, hence the hypothesis research test used Independent Sample T-Test. The test result showed that mathematical critical thinking ability for students’ Senior High School who taught with Flip-Problem Based Learning based on LMS-Google Classroom. The result proved that the mathematics learning process of Flip-Problem Based Learning has a positive and significant effect on students’ mathematics critical thinking ability. Based on this research result, Flip-Problem Based Learning was recommended to be applied in mathematics learning. LMS-Google Classroom can also be one of the solutions in mathematics learning based on digital.