bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Speech Recognition Technology in English Pronunciation Similarity
Authors: Hu Jiajun 
Published: August 2020

Abstract
Authentic English pronunciation is very important in daily communication and mutual understanding. With the improvement of automatic speech recognition technology, the computer-aided pronunciation practice (CAPT) system can already provide limited interaction for second language learners. Pronunciation similarity comparison is a key step in building a system, designing a model that recognizes the similarity of English pronunciations. By calculating the similarity between the learner’s pronunciation and the standard voice, and comparing with the expert’s score on the learner’s pronunciation, the correlation between the two is calculated to verify the feasibility and effectiveness of the model.
Design and Optimization of Feeding Device for Sterile Seed Long Fiber Extractor
Authors: Sun Juyan , Liu Tong , Liu Jiazhen 
Published: August 2020

Abstract
The feeding status of feeding device is an important factor that affects the performance of the main machine and even the process line. Taking the assembly layout of the feeding device and the structure of key parts as the research object, we conducted research design and analysis of the feed roller and cotton-feeding roller structure and their configurations. The results show that vertical feeding is conducive to the continuous and uniform feeding of materials; the combined use of cotton-plucking feed roller with roller is superior to the combination of multiple rollers; the progressive differential feeding mode makes for gradually thinning the material bed, improving the long fiber extraction rate, reducing the impurity rate, reducing the unattached fiber and greatly improving the machine performance; Φ58×1200mm cotton-feeding roller with a hexagonal spindle structure has higher deformation resistance than simple hollow structure. The research can be a reference for the optimization and design of sterile cottonseed extraction machine and equipment.
Design of self-propelled asparagus mechanized harvesting device
Authors: Zhang Rihong , Zhu Lixue , Yang Songxia , Yao Huaping 
Published: August 2020

Abstract
At present, the harvesting process of asparagus still depends on manual work, which is faced with the problems of large labor intensity and labor shortage. At the same time, the growing law of asparagus is random and the growth height is different. This paper presents a mechanized harvesting machine of self-walking asparagus. The punching angle and cutting height of pneumatic punching mechanism and the inclination angle of feeding roller can be adjusted in a certain range, which can adapt to the wide working conditions and harvesting demands.
Design of feed screw conveyor
Authors: Liu Mingming , Wang Ning , Chen Xiaomei , Shan Ying , Li Jiangpeng 
Published: August 2020

Abstract
Aiming at the problem of material transportation in the feed industry, a kind of feed screw conveyor was designed. The overall structure design of the screw conveyor was completed according to the parameters of material particle characteristics and conveying requirements of the feed. The functional parameters in the design process of the screw conveyor were calculated. The test results show that the design meets the transportation requirements and provides a reference for similar material transportation.
Study on rising flow characteristics of triple bubbles
Authors: Zuo Juanli , Zhang Kai , Wei Bingqian , Hou Jingming , Zhang Ning , Wu Shuang 
Published: August 2020

Abstract
In order to study the influence of bubble size and distance on the interaction between bubbles, this paper discussed the rising movement characteristics of triple bubbles in static water based on Fluent software. By analyzing the rising track, flow fields and velocity of bubbles, the results show that, when bubble diameters are 4mm, 4mm, 4mm, the distance between the left bubble and the middle bubble is smaller than the minimum coalescence distance, and they coalesce. When bubble diameters are 6mm, 4mm, 4mm, the velocity and track of the small bubble at the bottom will be affected by the wake of the big bubble as the big bubble rises, but they do not coalesce. When bubble diameters are 2mm, 6mm, 2mm, the smaller bubbles on both sides are attracted by the middle bubble and they coalesce; there is almost no vertical rise or deviation process.
Data-driven trajectory tracking of manipulator with event-triggered model updating
Authors: Wang Yuanxiang 
Published: August 2020

Abstract
In recent years, robot industry has developed rapidly, which has been widely used in industrial production and social life. The control problem of manipulator system with strong nonlinearity has become a hot spot. The difficulty of the trajectory tracking control of the manipulator is that the manipulator system is generally complex, and its dynamic model is very complex, including multiple mutually coupled inputs and outputs, sensor noise, friction in the manipulator and the flexibility of the joint link, which makes the manipulator system highly nonlinear. At the same time, due to some errors in the measurement of some inherent parameters of the manipulator, as well as different interference in the external environment, it is difficult to establish the accurate mathematical model of the manipulator system. In this paper, the Gauss process feedback linearization method based on the updating of the event triggered model is applied to a manipulator system with three degrees of freedom to realize the trajectory tracking control of the manipulator. And for the real-time requirement of trajectory tracking of manipulator, sparse Gaussian process regression is used to solve the problem of large amount of calculation of Gaussian process regression under large data samples.
Dynamics model of NIMBY risk diffusion system in ‘The Belt and Road’ energy investment
Authors: Sun Jin-Hua , Hu Jia-Li , Pu Dong , Hu Jian 
Published: August 2020

Abstract
Through the analysis of the interaction among various influencing factors in the ‘NIMBY’ risk diffusion system, the boundary of NIMBY risk diffusion system in ‘The Belt and Road’ energy investment is determined, and the basic assumptions of the system dynamics model are made. On this basis, a causal relationship diagram of NIMBY risk diffusion is established, and the mechanism of nimby risk diffusion is explained in the form of cause tree. Moreover, based on the causal relationship diagram, the flow diagram of NIMBY risk diffusion system was established, and the system dynamics model framework was determined.
Design of Diaphragmless Shock Tube and Research on its Normal Temperature Characteristics
Authors: Zhang Ming-Yuan , Chen Xi , Liu Peng , Yang Kai-Di , Zhu Hai-Dong 
Published: August 2020

Abstract
Shock wave is an important physical phenomenon in supersonic airflow. The shock tube is an experimental device that generates shock wave. It generates shock wave by generating a pressure difference between its high-pressure section and low-pressure section. Most researchers in the world use diaphragm shock tubes to generate shock wave, such as single diaphragm structure and double diaphragms structure type shock tubes. Although the type of shock tube can generate an incident shock wave with a wide range of Mach numbers, in the process of producing shock wave and breaking film, there will be broken film fragments interfering with the flow field. And every time the researcher needs to replace the diaphragm after the experiment, the efficiency of the experiment is low. In this paper, a diaphragmless shock tube is designed. The high-speed reciprocating motion of two pistons in the high-pressure section is used to replace the process of membrane rupture. And the normal temperature characteristics of the shock tube are researched.
Structural Design and Simulation Analysis of 1000kN Large Tonnage Steel Strand Testing Machine
Authors: Gu Weilin , Li Xiaoyang , Feng Jianhe , Yang Tingshuai , Cui Weihua 
Published: August 2020

Abstract
The structure design of 1000kN steel strand testing machine was carried out aiming at the requirement of large-tonnage mechanical performance testing of the steel strand. The structure of the testing machine was simulated to analyze the stress and deformation of key parts in the main structure with the help of finite element analysis software. The results show that the mainframe has good rigidity and the main components meet the strength design requirements.
Simulation and research of one-way valve Piston Pump based on AMESim
Authors: Qin Zhenhua , Wang Kezhou , Li Yueyang , Sun Juyan 
Published: August 2020

Abstract
Plunger pump is the main pressure source in high pressure hydraulic system, the inclination Angle of the swash plate in the plunger pump is one of the main factors affecting the performance and efficiency of the hydraulic system. This paper deeply analyzes the swash plate Angle and the plunger form on the influence of the plunger pump flow and pressure, theoretical analysis, numerical calculation and AMESim simulation were used to analyze and compare the flow and pressure of the plunger pump under different conditions, and the pressure flow curve of the plunger pump was obtained, which laid a foundation for the structural design and pressure flow characteristics of the plunger pump.
Kinematics Analysis and Trajectory Planning of the Working Device for Hydraulic Excavators
Authors: Zhang Jingming , Zhang Zhen , Luo Nianning 
Published: August 2020

Abstract
Robotization has become a research hotspot in the field of excavation machinery. In this paper, the excavator working device is regarded as the open-chain 4 DOF manipulator. The link coordinate system is established by D-H method, and forward kinematics from the configuration space to the joint space is analysed. Moreover, inverse kinematics and the mapping relationship between the joint space and the driving space are solved by geometric approach. The manipulator kinematics model is developed based on MATLAB Robotics Toolbox. Meanwhile, the point cloud image of the workspace for the excavator working device is plotted by the Latin hypercube sampling, and the complete working sequence for the excavator is planned and simulated. To verify the effect of trajectory planning, a multi-physics domain fusion model including the mechanical kinematics model, the hydraulic subsystem and the trajectory tracking control strategy was implemented by hybrid modeling method in MATLAB. At the same time, this work also presents a theoretical reference for the research of the motion trajectory for the excavator working device.
Modeling and Verification of CBTC system security Communication protocol based on time Automaton
Authors: Zhao Yan , He Tao , Li Qiang 
Published: August 2020

Abstract
With the rapid growth of population and economy, passengers’ demand for urban rail transit is increasing, and it is difficult for single-line rail transit to meet passengers’ demand for rapid transfer. Therefore, the interconnection between urban rail lines has been the focus of development in recent years. Therefore, the secure communication between various devices is a very important link in the interconnection test. Chongqing Metro Line 10 is the first metro line to realize the interconnection based on the secure communication protocol, in which the specific parameter setting in the secure communication protocol is specified, so the method is needed to verify the security of the protocol. In this paper, the time automaton theory is adopted to carry out the corresponding modeling work for the two key safety key contents of the safety communication protocol in the railway, namely the protocol chain building process and the protocol retransmission process, and verify its security and timeliness. Finally, a test platform is built to test the communication function between the systems.
Study on Critical Load for Multistage Hydraulic Cylinder
Authors: Xie Fang , Zhang Peng , Liu Dejun 
Published: August 2020

Abstract
To prevent the appearance of buckling failure when the multistage hydraulic cylinder works, the finite element of compression rod simplified model instead of multistage hydraulic cylinder is established based on the importance of engineering safety operation. The linear and nonlinear buckling analysis for compression rod can be realized by the finite element analysis software called ABAQUS. Meanwhile, the value of critical load for compression rod can be calculated and compared from two aspects of linearity and nonlinearity. The results indicate that the value got from nonlinear buckling analysis is more conservative than linear buckling analysis and the value of critical load is proportional to the cross section area.
Research and development of fire extinguishing equipment for passenger compartment
Authors: Zhang Tianhao , Xu Shuquan , Liu Fujia 
Published: August 2020

Abstract
In view of the problems of the passenger vehicle, such as single fire-fighting method, low degree of automation, long response time, poor fire extinguishing effect. In this paper, the high-pressure water mist fire extinguishing equipment for passenger compartment was researched and developed. The defects and characteristics of fire prevention and control of passenger vehicle were analyzed firstly, and on this basis, the functional requirements and selection schemes of fire prevention and control equipment were proposed. Then, the selection scheme was used for trial production of equipment, and the fire extinguishing performance test was carried out to verify the effectiveness of the equipment. The test results showed that the equipment had good fire extinguishing effect. After the equipment was activated, the fire in the passenger compartment was significantly suppressed. After 3 s of start-up, the open fire was almost extinguished. After 10 s of start-up, the toxic black smoke almost disappeared and the average temperature in the passenger compartment dropped to 60°C.
Optimization of crankshaft main bearing lubrication performance considering bearing profiles
Authors: Du Qingchuan , Cheng Ying , Ren Peirong , Zhang Zhongwei 
Published: August 2020

Abstract
It is the aim of this work to reduce friction power loss of main bearings by optimization. To this purpose, elastohydrodynamic (EHD) model is used for EHD calculations for different main bearings. BP neural network is implemented to establish the approximation model for bearings. Then, multi-objective optimization of bearings using genetic algorithm is formulated and conducted. It is found that a more compliant bearing profile can provide hydrodynamic lift during film lubrication while bearing profiles have more significant impact on lubrication performance in comparison to other key parameters. The results of the BP network model using the genetic algorithm agree closely with the calculated value based on EHD-MBD model. The presented approach allows reliably to conduct the optimization of bearings. After optimization, the friction power loss is significantly reduced while the minimum oil film thickness increases and the total pressure drops.
Coupling Effect Analysis of Airborne Cable under High Intensity Radiation Field Environment
Authors: Sun Fei , Jia Yun-feng , Duan Bo 
Published: August 2020

Abstract
With the improvement of equipment informatization, the importance of electromagnetic compatibility and the adaptability of complex electromagnetic environment has become increasingly prominent, and the influence of high intensity radiation fields (HIRF) on aircraft electronic equipment has become more and more significant, which has seriously threatened flight safety. In order to examine the coupling characteristics of airborne cables under HIRF irradiation, this paper used FEKO electromagnetic simulation software for analyse and study. The influence of different radiation fields, cable types, installed positions and gap structure on the simulation results was analyzed. And coupling patterns of airborne cables in the HIRF environment were obtained. The conclusions obtained in this paper have a definite guiding significance of the research on airborne cable protection for HIRF.
Design of digital detection circuit for signal of helium optical pump magnetometer Summary
Authors: Chen Long , Ping ZengLiang 
Published: August 2020

Abstract
Magnetic field measurement technology is an important method to study physical phenomena related to magnetic field. Magnetic field measurement, especially weak magnetic field measurement, often plays a vital role and has important theoretical significance and engineering value for the research of high-performance magnetic field measurement instruments. The helium optical pump magnetometer is a high-precision magnetic measuring device that uses optical pumping and magnetic resonance to realize magnetic field measurement based on the principle of optical magnetic resonance. It has the advantages of low noise, wide measurement range, and low temperature working environment. It has significant advantages in the field of weak magnetic field measurement and can be widely used in scientific research, national defense construction, industrial production, daily life and other fields. The traditional detection circuit is based on a voltage-controlled oscillator as the core and an analog circuit-based detection system. The modulation signal is used for magnetic field detection. The detection speed is slow, and the modulated signal will superimpose an interfering magnetic field on the probe, affecting the measurement result. This paper designs a digital detection system with DDS technology as the core, which greatly improves the speed of detecting the magnetic field. A new swingswing frequency method is used to avoid the interference of the modulation coil, and a breakthrough in detection speed is achieved, reaching a sampling frequency of 20Hz. To meet the requirements of a system that requires continuous measurement at a faster rate.
A Novel Foreign Object Detection Algorithm Based on GMM and K-Means for Power Transmission Line Inspection
Authors: Yao Nan , Zhu Lvfu 
Published: August 2020

Abstract
The detection of foreign objects on transmission lines is an important research content of intelligent inspection in smart grid. The foreign objects on the transmission line tower will cause adverse effects on the transmission line and other equipment, and even endanger the safe operation of the power grid. In order to accurately identify foreign objects on power transmission lines, this paper proposes an unsupervised foreign object detection algorithm based on GMM (Gaussian Mixture Model) and k-means. Firstly, K-means is used for clustering, and then GMM is used for clustering. Finally, the foreign objects on the power transmission line are identified according to the clustering results. Experimental results show that the proposed algorithm has a high recognition rate. In addition, the more samples, the higher the recognition accuracy.
A Cross Correlation based Back-Projection Imaging Method for Through-Wall Imaging
Authors: Cai Jiliang , Peng Peng , Zeng Huiyong , Wang Shiqiang 
Published: August 2020

Abstract
A back-projection (BP) algorithm based on cross-correlation (CBP), which is both fast and good at suppressing artifacts, is adopted here for through wall imaging (TWI). Firstly, by “moving” the wall to the image point, the three layer TWI modal is equivalent to the two layer TWI modal. By doing so, only half of the reflection points are needed to be calculated; secondly, to further reduce the calculation time, on the one hand, the symmetric-invariant property as well as the shift-invariant property of the ray propagation is used to calculate the look-up table, on the other hand, the delay-multiply-sum equation in CBP is rewrite into a new form with less addition and multiply computation. Simulation results show the superiority of the proposed CBP algorithm both in operation speed and artifacts suppression.
A Flame Detection Method Based on Fusion Feature and SVM for Substation Inspection
Authors: Deng Jieqing , Wei Chao , Chen Guang , Xu Liang , Zhu Bo 
Published: August 2020

AbstractFor the safety inspection of substation, this paper proposes a flame image detection method based on the combination of fusion feature and support vector machine (SVM). Firstly, the suspected flame area is detected by motion detection and flame color model. Then, four features of B-channel color variation coefficient, roughness, flicker frequency and flame area change rate are extracted. Finally, four features are sent to SVM to learn the flame classifier and used in video flame detection. The experimental results show that the proposed method can effectively identify the flame.
Research on the influencing factors of consumer satisfaction in agricultural e-commerce supply chain
Authors: Chunshang Wu 
Published: August 2020

Abstract
In recent years, e-commerce for agricultural products has developed rapidly, but the overall scale of e-commerce for agricultural products is still small due to consumers’ low satisfaction with the overall supply chain of e-commerce for agricultural products.So, it is very important to find out the key factors that affect the satisfaction of agricultural e-commerce supply chain and improve consumer satisfaction. Through the construction of factor analysis model, this paper analyzes the factors that affect the supply chain of e-commerce of agricultural products, and finds that the quality of agricultural products is the most influential factor, followed by after-sales service, e-commerce platform, and the price factor is the least. Therefore, in order to improve consumer satisfaction, we should focus on improving the quality of agricultural products, after-sales services, e-commerce platform convenience.
Explore the research fronts of cross-border E-commerce
Authors: Pan Chung-Lien , Niu Jiangrong , Luo Ting , Chen Zixuan 
Published: August 2020

Abstract
Cross border e-commerce as a trend of development in recent years has been widely concerned. The policies issued by the government and the global economic development situation have also been promoting the development of cross-border e-commerce. It is not difficult to see that cross-border e-commerce is in full swing at home and abroad, showing a high-speed development trend. In this context, in order to systematically review the relevant literature in this field, based on the scientific econometric analysis of 431 articles published from 1995 to 2020 collected from the WOS database, the author analyzes the development of cross-border e-commerce by using this database, summarizes the annual trend since 1995, publishing institutions and publications, and analyzes the author’s keywords Visual integrated presentation. The purpose of this paper is to provide some reference points for researchers, managers and industry professionals.
Research on excitation system of synchronous generator
Authors: Jiang Dawei , Qian Xinyu , Yu Longbin , Wang Guanyu , Zhao Zijian , Cheng Xiang , Li Jing 
Published: August 2020

Abstract
With the rapid development of power grid, large capacity units are continuously put into operation, which makes the small interference. This paper analyzes the influence of different regulation modes of AC exciter excitation system on the performance of generator excitation control system, demonstrates that PID excitation regulation can effectively improve the quality of excitation control, and simulation test is an effective measure to adjust the parameters of excitation system.