bluuebunny/crossref_metadata_2025_split huggingface dataset:
Steering body-tire angle control strategy optimization of wide-body airplane ground turning
Authors: Li Jing , Wu Yuanyuan , Zhao Zhe , Lu Qing 
Published: October 2020

Abstract
The wide-body airplane’s unsynchronous coordination of the inner and outer steering body-tires turning angle during the ground turning process will increase the lateral force of the tires and cause side slip accidents. This paper considers the dissymmetry of the inner and outer steering body-tire turning angles during the ground turning process, calculates the theoretical turning angle mathematical relationship between nose-tire and steering body-tire, optimizes the steering body-tire control strategy from "symmetric turning angle control strategy" to "dissymmetric turning angle control strategy". By comparison, the optimized "dissymmetric turning angle control strategy" can effectively reduce the lateral force of steering body-tires during the ground turning process, decrease the risk of side slip accidents and tire abrasion. Besides, the optimized "dissymmetric turning angle control strategy" can reduce the lateral force difference between the inner and outer steering body-tires during the ground turning process, making the lateral force distribution more balanced, reducing the damage to landing gear structure caused by unbalanced lateral force and extending the service life of body landing gear.
Design of an MEMS-IMU/GNSS integrated navigation algorithm
Authors: Geng Xingshou , Tang Kanghua , Wu Meiping 
Published: October 2020

Abstract
In order to simplify the MEMS-IMU/GNSS integrated navigation system model, improve the navigation accuracy of the carrier under the motion condition of large Angle or frequent steering turning, two navigation modes are adopted. When GNSS signals are available, horizontal velocity and height error are used to construct three-dimensional measurement equations for partial integrated navigation. When GNSS signals are unavailable, kinematic constraint equations are introduced to assist MEMS-IMU for auxiliary navigation. Considering the problem that MEMS gyroscope zero is too large and compass effect is difficult to be reflected, a partial attitude feedback strategy is adopted for the feedback correction. The experimental results show that when GNSS signals are available, compared with the six-dimensional integrated algorithm of speed and position, the partial integrated algorithm simplifies the system model, reduces the dimension of the system, and reduces the amount of calculation, it also has better accuracy. When GNSS signals are unavailable, kinematics constraints auxiliary navigation can effectively restrain position offset, reduce navigation errors and improve navigation accuracy.
Study on Flow Characteristics and Linearization of Pneumatic High-Speed On-off Valve
Authors: Yang Jiabin , Li Xiaoning 
Published: October 2020

Abstract
It is hard to model the dynamic flow rate of pneumatic high-speed on-off valve due to its dead zone and nonlinearity. The average opening ratio was proposed to describe the dynamic flow rate after systematically analyzing the spool action characteristics. The mathematical relationship between flow rate, frequency, and duty cycle was established. Experimental results show that the method can accurately reflect the dynamic flow characteristics. Finally, a piecewise linearization method is designed to make the flow rate proportional to the input.
Digital twin based comfort scenario modeling of ATO controlled train
Authors: Meng Zicong , Tang Tao , Wei Guodong , Yuan Lei 
Published: October 2020

Abstract
Whether in Europe or China, ATO based train control system has become a trend. However, the application time of ATO is short and the user experience is insufficient. In order to better carry out system research and development, system test, system optimization and other work, the construction scheme of the simulation platform based on digital twin is proposed. In this paper, by comparing five-dimension model with three-dimension model, digital twin is built based on the five-dimension model of digital twin, and the virtual model in the five-dimension model is introduced in detail. Physical, behavioural, rule and geometric models are constructed from the four perspectives of the effect of each element in the scene on the train, the dynamic characteristics of the train, the correlation between the elements and the scene, and the visualization of the scene. Based on digital twin, the paper designs the framework of simulation platform to support ATO performance optimization and other work. The parameters in the model can be adjusted repeatedly through field data to achieve higher consistency between the model and the simulation object.
Design and application of support capability evaluation system for complex system
Authors: Wu Fei , Meng Zhe , Mao Hanyuan , Guan Xujun , Sun Shaohua 
Published: October 2020

Abstract
Aiming at the problem of low accuracy and effectiveness of complex system support capability assessment, an index system was constructed on the basis of studying the characteristics of support capability generation elements, in which the systematicness, comprehensiveness and the importance of key links of complex system support were considered, a complex system supportability evaluation model was proposed based on weight scores and key levels, and the score and level of the complex system supportability evaluation were obtained through comprehensive evaluation. A corresponding evaluation system was designed which provided the means and support for the informatization of support capability evaluation of complex systems.
Development of metallized three-directional fibre Bragg grating strain sensor
Authors: Chen D.M. , Dai X.N. , Tang Z.B. 
Published: October 2020

Abstract
The theory and application of fiber Bragg grating sensors are studied in this paper. The three-directional metallized fiber Bragg grating strain sensor with temperature compensation has been developed. The Metallization Technology of fiber grating is studied. The Metallization Technology Scheme of fiber grating is discussed in detail. The electroless composite nickel-plating process and the formula of nickel-plating process are given. A metal fiber grating strain sensor with temperature compensation is developed. The metal fiber grating sensor is fixed to the substrate by laser welding, and a one-way metal fiber grating strain sensor with temperature compensation is formed. Three unidirectional metallized fiber Bragg grating strain sensors are connected with the developed common welding blocks to form a three-directional strain flower. Comparing with resistance strain rosette stress test and its application in ship structure stress monitoring, the fiber grating strain sensor developed in this paper fully meets the requirements of large-scale structure long-term strain monitoring.
Evaluation of operation lifetime of microwave low noise NPN bipolar junction transistor
Authors: Wei Zhichao , Sun Yi , Zhang Hongwei , Xue Pengchao , Sun Yabin 
Published: October 2020

Abstract
In this paper, the lifetime of microwave low noise NPN bipolar junction transistor under three operation modes are deeply investigated. Experiment results shows that the electrical parameters keep nearly unchanged when a steady electrical stress is applied over 2000 h at 125°C. The junction temperature (Tj) is found to have a significant influence on the operation lifetime. The samples begin to fail once Tj is higher than 225°C. Furthermore, the higher the junction temperature is, the earlier the failure occurs, and the shorter the lifetime is. The accumulated damages near Si/SiO2 interface around BE junction are contributed to the failure under high temperature. The estimated mean time to failure based on the failure data under high Tj is higher than that from non-failure data under low Tj. HTRB stress are found to be able to result in damages around LOCOS edge under BC junction, but the induced variation of related electrical parameters is still far below the specified failure criterion. All these data obtained here can provide a reliability foundation for bipolar transistors.
Laser ultrasonic testing for inspection of curved surface samples based on synthetic aperture focusing
Authors: ting Yang , wen He , jianzong He , haohui He , jinjing Yuan , Wan Zhang , Ling Yuan , Hongchao Zhang 
Published: October 2020

Abstract
Synthetic Aperture Focusing (SAFT) is one of the methods to improve the spatial resolution in laser ultrasound. However, the research on laser ultrasonic SAFT technology is mainly focused on block or plate samples. In order to study the detection capability of laser ultrasonic SAFT technology on the samples with curved surface, a finite element simulation model of curved surface samples with sub millimeters internal defects is established. And then the laser ultrasound field is obtained through numerical simulation. At last the SAFT algorithm was performed to image the defects in the samples. The results show that laser ultrasonic SAFT technology can image curved surface samples with sub millimeters internal defects. The results provide a reference for the practical application of laser ultrasonic SAFT technology.
Comparison and Analysis of Oil Tank Test Results by PAC and Vallen Acoustic Emission Instrumentations
Authors: Zhang Shijie , Pan Meng , He Zhi , Deng Di , Han Jiakai 
Published: October 2020

Abstract
In this article, two acoustic emission instruments, PAC and Vallen acoustic emission instruments, are applied to carry on the test of crude oil storage tanks. Four experiments contents have carried out such as active defect test, corrosion test, vibration test, leak test. And compare and analyze the acoustic signal characteristics of the above four detection contents of two acoustic emission instruments. The differences and advantages and disadvantages of the four detected acoustic signals of the two acoustic emission detectors are summarized. The research results provide certain basic test support for the improvement and development of acoustic emission testing equipments and supporting software.
Steady State Energy Flow Analysis for Energy Internet Planning
Authors: Ji Xiaoqing , Wang Fei , Song Feng , Liu Junxu , Liu Jie , Xiong Dang 
Published: October 2020

Abstract
The planning and design of the energy Internet is a primary and significant link of the energy Internet. For this paper, its basic work is to design, analyse and calculate the energy flow of the network. In this paper, a typical energy flow analysis model of power-gas interconnection system is established, and the algorithm of the model is given to solve the problem. Finally, the feasibility of the algorithm is verified by a classical example of electricity - gas interconnection.
Research on IACA of distribution network fault location
Authors: Liu Xue , Jia Jun , Wang Jian 
Published: October 2020

Abstract
In power system, the probability of distribution network failure is the highest, which will directly affect the power consumption experience of customers. The timely and accurate fault location of distribution network is very important to improve the reliability of power supply. In this paper, firstly, the switch function and evaluation function of distribution network fault location are discussed. ACA(Ant Colony Algorithm) algorithm has some defects such as premature convergence. In order to solve this problem, the IACA(Improvement Ant Colony Algorithm) method is proposed. Finally, the feasibility and effectiveness of the new method are verified by establishing a simple distribution network model.
Research on Constitutive Model of Unsaturated Sand
Authors: weihua Zhang , chenggang Zhao , yanhua Gao , chunlei Zhao 
Published: October 2020

Abstract
For unsaturated sand, due to the existence of suction, under low confining pressure, it has a large volume change during shearing and obvious dilatancy and peak characteristic points appear in the whole stress-strain behavior. Based on the above situation, the boundary surface constitutive model of unsaturated sand is established in general stress space and triaxial stress space based on phase transition state and hydraulic-mechanical coupling. The model has smooth transition among different saturation state and model parameters are easily calibrated via common triaxial tests and some other simple tests.
Analysis of elementary school students’ mathematical resilience during learning during the covid 19 Pandemic
Authors: Rahayu G D S , Altaftazani D H , Kelana J B , Firdaus A R , Fauzi M R 
Published: October 2020

Abstract
This research is motivated by a change in learning methods that were initially face-to-face to online learning that resulted from the COVOD-19 outbreak. The purpose of this study was to analyze the mathematical resilience of elementary school students during learning during the COVOD-19 pandemic. The method used in this research is descriptive method with 36 elementary school students as subjects in one of the primary schools in Majalengka district, West Java, Indonesia. The results of this study, mathematics resilience of elementary school students is in the medium category. The findings related to mathematics resilience of elementary school students namely resilience is not only influenced by the complexity of the material and changes in learning methods. However other factors such as the packaging of learning by the teacher, the media used by the teacher, and the communication used by the teacher also affect the mathematics resilience of elementary school students.
Math study habits on deaf learners
Authors: Leton S I , Jagom Y O , Dosinaeng W B N 
Published: October 2020

Abstract
The purpose of this study was to obtain a picture of mathematics learning habits for deaf students. The subjects in this study were 99 deaf students taken purposively in across 4 schools, including, SLB B Karya Murni Ruteng, SMPLBN Semarang, SLB B Don Bosco Wonosobo, and SLB B Denaupakara Wonosobo. The research involved a quantitative and qualitative research design where the quantitative data was taken from a set of questionnaires that included a commitment attitude questionnaire, a disciplinary attitude questionnaire and a commitment attitude questionnaire in learning mathematics; meanwhile, a qualitative data was gained through the observation of learning activities at their schools and at their boarding house. The results of the analysis showed that students’ consistent attitude, disciplined attitude, and attitude of commitment in learning mathematics were in a good category; therefore, we assumed that deaf students maintained good habits in learning mathematics. By having these good study habits, they were expected to acquire basic skills related to basic arithmetic operations that will be applied in life skills such as sewing, making patterns, carpentry, and automotive. Also, good study habits might improve their cognitive skills that impacted their study result and learning achievements that in turn enable them to reach their goals.
Responses of students with special needs to online mathematics leaning during pandemic
Authors: Balkist P S , Agustiani N 
Published: October 2020

Abstract
This study aims to understand the responses of students with special needs to learn mathematics during pandemic Covid-19 in inclusive schools. The method of research is descriptive qualitative. The subject of this study were three students with special needs in class X in the inclusive school SMA N 1 Sukabumi, those are a student with visual impairment, a student with physical disabilities, and a student with mental retardation. The results showed that students were enthusiastic about learning online, and were good enough in the timeliness of collection the task also the accuracy of the content. However, enthusiasm, timeliness, and accuracy of content decreased over time, because it lacks direct interaction and innovation of media online learning.
Project-based learning in mathematics: A literatur review
Authors: Fisher D , Kusumah Y S , Dahlan J A 
Published: October 2020

Abstract
This study is a literature study with a descriptive qualitative research with library research that attempts to describe project-based learning in mathematics learning. In this literature study research the author uses various written sources such as articles, journals and documents that are relevant to the study in this study. This study focuses on the characteristics of project-based learning, steps of project-based learning, and examples of project-based learning assessments, Differences in Project-Based Learning Emphasis and Traditional Learning, Examples of the application of project-based learning in mathematics. The next research that is interesting to be developed as research is project-based learning in increasing High Order Mathematical Thinking (HOTs).
Problem solving and cognitive style: An error analysis
Authors: Ratnaningsih N , Hidayat E , Santika S 
Published: October 2020

Abstract
Problem-solving and cognitive style are two things that are important to note, but the reality is rarely considered especially cognitive style. Student cognitive style can influence problem-solving abilities. This study aims to investigate student errors based on Newman in problem solving, in terms of independent and dependent field cognitive style. The study was conducted on junior high school students in Indonesia, the method used is exploratory involving 2 Subject. Subjects are taken from independent and dependent field style cognitive groups. Stages of problem-solving according to Polya’s includes: understanding the problem, devising a plan, carrying out the plan, and look back. Errors according to Newman include errors in reading, comprehension, transformation, process skills and encoding. Data were collected using the Group Embedded Figure Test (GEFT) and problem-solving test. The conclusion shows that subject with field dependent cognitive style with the initials SFD tend to make errors at the transformation stage in making models, process skills in manipulating algebra and calculation processes, and conclusions for making errors in the previous stage. Whereas subject with independent field cognitive style with the initials SFI tend to make errors at the process skill stage in manipulating algebra and calculation processes.
The development of IT-based learning evaluation media using wondershare quiz creator on the statistics course
Authors: Rodliyah I , Saraswati S 
Published: October 2020

Abstract
The aim of this research is to produce an IT-based learning evaluation media for Hasyim Asy’ari University students, especially mathematics education study program by using the ADDIE model which consists of five stages, namely (1) analysis, (2) design, (3) development, (4) implementation, and (5) evaluation. The subjects include media experts, material experts, and students as media users. The research instrument used was a questionnaire of product quality filled out by students and also a validation sheet filled out by Media and Material Experts. Data processing is performed after the product data has been successfully obtained. The data is then analyzed by using the percentage formula. Through the data analysis, the percentage obtained by media expert validation was 90.36%, and material expert was 91.43%. The practicality results at the implementation phase showed the percentage of assessment was 92.27% while the effectiveness results of classical completeness was 87.36%. The results of the Validity and Reliability analysis of each item were declared valid and reliable with an Alpha value of 0.943. So, based on the eligibility criteria guidelines, overall the IT-Based Learning evaluation media in the form of the Wondershare Quiz Creator is declared worthy to be use.
Mathematics learning in elementary school through engineering design process method with STEM approach
Authors: Firdaus A R , Wardani D S , Altaftazani D H , Kelana J B , Rahayu G D S 
Published: October 2020

Abstract
Education is developed to prepare students to face possible problems that might arise in the future. Recent trends show that many job opportunities in the fields of Science, Technology, Engineering, and Mathematics exist in the industrial world, but most of them think that school graduates are not in line with the needs in the field. One of them is because people are too focused on one area. Therefore we need the development of learning that can integrate various subjects, especially in the fields of science, technology, engineering, and mathematic. This research is intended to describe the development of mathematics learning through engineering design process method with STEM approachs. The method used in the form of a descriptive method with research subjects for six-grade elementary school students in Indonesia. The learning is based on mathematics about surface area and natural science about electricity. Through this research, it is produced that learning based on science, technology, engineering, and mathematics can provide exciting experiences and increase their interest in learning mathematics more deeply.
Acceleration analysis of population growth using winter’s method: case study of lombok island
Authors: Negara H R P , Syaharuddin  , Ibrahim M , Kurniawati K R A , Mandailina V , Pramita D , Abdillah  , Mahsup  , Ahmad  , Saddam  
Published: October 2020

Abstract
The research aims to analyze the acceleration of the population growth in Lombok which consists of 5 districts/cities using forecasting system by constructing the winter’s method in the form of a GUI Multiple Forecasting System (G-MFS) based on Matlab by calculating the indicator level of accuracy to find predictive data for the next 10 years. At the data simulation stage, researchers used population data over the last 11 years. The evaluation of forecasting results is calculated by calculating the value of Mean Absolute Percentage Error (MAPE) with 27 attempts through modified Winter parameter values. From the simulation data obtained the most optimal parameter value is α, β, and γ sequential values of 0.9, 0.5, and 0.9. Then with the value of the parameter obtained MAPE value of 1.25%. Furthermore, it can be noted that for the next 10 years the increase in the population of Lombok Island on average of 1.49%, with the average East Lombok district details of 1.15%, the average West Lombok district by 1.17%, the average central Lombok district of 0.98%, the North Lombok district averaged 0.98%, and the average Mataram city of 3.05%. These results suggest that the simulated and numeric techniques using the GUI of MATLAB provide quite accurate results. In subsequent research, it is necessary to do predictions based on the number of births, the number of deaths, the number of transmigration, the amount of productive and non-productive, and other data series that is more complex so that it will be seen how the development of the population productivity on the island of Lombok.
Magic covering and edge magic labelling and its application
Authors: Farida A , Indah R P , Sudibyo N A 
Published: October 2020

Abstract
Graph theory is developing very rapidly, especially in labelling graphs. This is proven by the number of researches examining graph labelling. In graphs labelling, research focuses on developing theories. On the other hand, graph labelling (magic covering and edge super magic labelling) has a useful application. This paper will discuss the magic covering of a simple graph (Domino graph) and edge magic labelling on a simple graph (Domino graph). The conclusion is that the magic covering can be applied to a secret sharing scheme, and also edge magic labelling can be applied to ruler models.