bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Performance of Grounding Conductor Based on Multi-Physics
Authors: Xiangdong Sun , Hui Ding , Jinrui Cui , Yanwei Wang 
Published: April 2020

Abstract
The performance analysis of the grounding conductor is of great significance for improving the design and construction level of the grounding grid and rationally selecting the grounding conductor specifications.Based on the multi-physics analysis and calculation software COMSOL, this paper establishes a three-dimensional simulation model of the grounding conductor with the standard hexagonal M8 bolt as the research object.Firstly, the contact resistance of the grounding copper bus contact surface is calculated, and the influence of contact resistance is analyzed according to different factors. Then, the influence of different tightening torque on the maximum temperature of the contact surface under the condition of short-circuit current is calculated. Finally, the normal condition of the contact surface under different tightening moments and the pressure distribution characteristics during short-circuit are calculated. The results show that the bolt tightening torque, the surface roughness of the copper row, the selected grounding copper row material, and the overlapping area all have an effect on the contact resistance; When the grounding conductor is short-circuited, the maximum temperature on the contact surface decreases with the increase of the tightening torque. It is recommended to use copper as the material of the grounding conductor, and apply a tightening torque to the bolt at 24∼28N•m; At the same time, the distribution characteristics of the contact surface of the conductor under normal conditions are analyzed. Finally, based on the research results, the method of reducing the grounding resistance at the grounding conductor joint in practical engineering is proposed.
Design and study of slow wave structure of the THz folded waveguide TWT over 60W
Authors: Zhang Xiaohan , Cao Linlin , Li Fei , He Jun , Huang Mingguang 
Published: April 2020

Abstract
In this paper, the equivalent circuit method is used to analyze the dispersion characteristics of the folded waveguide and calculate the coupling impedance. The influence of the surface roughness and conductivity of the waveguide on the loss of the high frequency circuit is considered. In order to improve the efficiency of the beam wave interaction, the two kinds of slow wave structures of the folded waveguide TWT are designed by using the variable period technology. The three-dimensional electromagnetic software Microwave Tube Simulation Software (MTSS) is used to simulate the beam wave interaction of TWT. After optimization, the output power of both structures is over 60W, the electronic efficiency is more than 5.5%and the gain is greater than 32dB in the 211GHz-221GHz frequency range.
Research on Partial Discharge Breakdown Location Technology of 1000kV GIS in Field Test
Authors: Wang Hui , Yao Weijia , Song Simeng , Zang Yiming , Qian Yong , Sheng Gehao 
Published: April 2020

Abstract
During the field test, if the input and output lines and intervals of the withstand voltage test after the GIS equipment are segmented, and a non-self-recovery discharge or breakdown occurs during the test, only the hearing of the human ear will determine the exact location of the failure. It is more difficult, and it is easy for misjudgement to waste manpower, material resources and cause unnecessary damage to equipment. Therefore, in the field AC withstand voltage test of GIS equipment, finding the location of discharge breakdown is a key technical problem that needs to be urgently solved on the site. This paper studies the propagation characteristics and detection principles of electromagnetic wave signals and vibration signals that cause breakdown faults in 1000kV GIS, and develops a positioning system based on combined acoustic-electrical detection technology for AC withstand voltage of UHV GIS in the field. In the test, it was verified through actual test cases that the method can quickly and accurately locate the location of the breakdown discharge, and provided a set of convenient and effective technical means to ensure the smooth on-site withstand voltage test of GIS equipment.
Research on Adaptive Segmentation Design Method of Route
Authors: Zhang Jin , Jun Li Shu , Wang Mo 
Published: April 2020

Abstract
With the continuous improvement of China’s international influence and the gradual implementation and deepening of the “One Belt, One Road” strategy, The scope of the ship’s activities has expanded from offshore waters to global seas. In view of the limitations of the protection needs of offshore navigation for many years, the traditional maritime protection has the characteristics of fixed coverage, fewer factors involved, and lower informationization. This paper introduces the current vector route design method for avoiding obstacles, and proposes a new double-sided convex hull expansion algorithm for its deficiencies in algorithm complexity. The shortest path to avoid obstacles is planned, and the feasibility and superiority of the algorithm are verified by experiments.
Improved SVM algorithm for upper limb rehabilitation mechanical arm Study on the Prediction of Track Tracking Control
Authors: Zenan Chu , Wei Wang , Di Wang 
Published: April 2020

Abstract
Aiming at the strong coupling, nonlinear and time-varying characteristics of upper limb rehabilitation training manipulator, a trajectory tracking predictive controller based on SVM (support Vector Machine) is designed. The input and output data of the manipulator system are collected, and the generalized inverse system is obtained by SVM identification, which is decoupling from the original system in series. For the decoupling system, the improved SVM algorithm is used to predict the trajectory tracking control, and the SVM algorithm is improved by combining the predictive function control method of PSO optimized rolling control sequence. The improved SVM algorithm can predict the trajectory of upper limb rehabilitation manipulator with high precision, and the experimental results show that the improved algorithm has good adaptability to the stability and robustness of the system.
The correlation between GDP and different transport modes turnover based on grey correlation analysis
Authors: Wang Yongbin 
Published: April 2020

Abstract
Transportation is the inherent law of economic development. With the deepening of reform and opening up, the adjustment of economic and industrial structure, transport volume have driven GDP growth to varying degrees. Therefore, based on the 1990-2017 transport turnover and GDP in China, this paper studies the decoupling relationship between GDP and transport volume at different stages, in which traffic volume has a week decoupling with GDP. By using the grey correlation analysis, the degree of correlation between different freight and passenger transportation modes at sample period is calculated to demonstrate the similarity with economic growth.
Optimization Research of Emergency Resource on Rail Transit Allocation Location Considering Multiple Transport Modes
Authors: Cao Shaona , Li Dewei , Cao Shaona 
Published: April 2020

Abstract
Rapid and effective emergency rescue is the key to reduce the loss of accidents after the occurrence of subway emergencies. Existing studies have not considered the difference between different demand stations and the use of multiple transportation modes for rescue. Reasonable allocation of subway emergency resources and transportation modes for rescue can improve rescue efficiency. In this paper, an emergency resource allocation model is established to minimize the generalized cost. The proposed model has two characteristics: one characteristic is to take passenger flow demand and historical accident data into consideration and quantify the passenger flow and frequency of station accidents to reflect the importance of different demand stations. Another characteristic is that the single rescue transportation mode is expanded into multiple transportation modes. Taking network of Beijing subway as an example, the model is applied and solved by CPLEX. When the actual data from 2013-2015 are substituted into the model, the solution result is compared with that of previous research model. The rescue time of this model considering multiple transport modes is lower than that of model considering single transport mode by 25.86%, and the rescue efficiency is improved. It concludes that the allocation model considering multiple transport mode can effectively reduce the time for rail transit when recovering from accidents.
AGV Task Distribution Study
Authors: Wu Guorong , Sun Xuan 
Published: April 2020

Abstract
In this paper, the traditional AGV task allocation mechanism assigns tasks with large path cost and low operational efficiency. A single AGV dual task allocation mechanism based on task priority and FCFS is designed. By changing the order and distribution mode of the main categories of tasks, the mechanism assigns two different kinds of tasks to the AGV, which reduces the empty vehicle operation caused by the continuous execution of similar tasks by the AGV, thereby reducing the path cost and improving the operational efficiency of the AGV system. The open-TCS simulation calculation uses this method to increase the operating efficiency of the AGV system by 20%.
Applying post-processing techniques of computed tomography imaging in diagnosing aortic dissection
Authors: Cui Fengzhi , Wang Jianqiu , Jin Longhai , Gong Tingting , Li Bo , Xu Nannan , Liu Jianhua , Yuan Qinghai , Wang Lei 
Published: April 2020

Abstract
Post-processing techniques of computed tomography imaging are playing a dominant and critical role in evaluation of AD. It is vivid for showing the whole contour of aorta, from different view. Post-processing techniques not only provide information of location, but also provide information of invading range. It is referred as preferred investigative modality for the diagnosis of aortic dissection, and has been widely used in clinic. Recently, it has become the first choice for clinical to diagnose AD, then it could provide important information for clinical selection of AD of surgical methods.
Research on Text Representation Method Based on Improved TF-IDF
Authors: Fu Yu , Yu You 
Published: April 2020

Abstract
According to the different importance degree between feature and text, this paper proposes a method of improved traditional TF-IDF algorithm according to the position information of the words and the ability to distinguish the texts, and proposes a text representation method based on improved TF-IDF and the corresponding word vector calculation method. Finally, the effectiveness of the method is proved by experiments.
Research on Testing of Optical Fiber Wavelength Division Multiplexing System
Authors: Zhang Peng , Tian Xingke , Zhang Jianwei 
Published: April 2020

Abstract
In order to meet the requirement of long-distance high-speed data bus for information transmission in vehicles, optical fiber wavelength division multiplexing (FWDM) technology is used to realize the transmission of multiple optical signals by connector. Although wavelength division multiplexing technology has been widely used in the field of communication, the adaptability of the real-time control system needs to be further studied. In this paper, a prototype of the optical fiber wavelength division multiplexing system is tested and the test results are preliminarily studied, which provides a basis for evaluating transmission reliability margin and analyzing system failure.
Development of Deep Sea Pipeline Position and Attitude Measuring Device Based on Flange Center Positioning
Authors: Wang Zhuo , Di Qiao-yue , Wang Tao , Zhang Bo , Ma Hong-wen 
Published: April 2020

Abstract
In order to reduce the measurement uncertainty of deep sea pipeline position and attitude measuring device based on flange centre positioning, this paper evaluates the solution process of pipeline pose and proposes a positioning method based on flange centre positioning. The problem of deep water riser measurement operation is solved on the basis of reducing the uncertainty. The final design-related prototype verifies that the measurement method can effectively reduce the uncertainty based on the accuracy.
Dynamic BOM Construction Technology and Application Based on MBD
Authors: Fa Jing , Wen Yang , Yongan Zhang , Rong Zhou , Xiuhui Gao 
Published: April 2020

Abstract
In view of the problem that the information transfer based on unstructured documents and non-dynamic BOM results in the limited efficiency and precision of spacecraft assembly configuration management, a dynamic EBOM construction technology based on MBD model is proposed. By adding assembly Configuration attributes to MBD model, it can cover the data requirements of spacecraft assembly process. The EBOM is constructed by extracting Assembly structure tree, product and configuration attributes of MBD assembly model. The dynamic EBOM is constructed by changing the value of the attributes describing the assembly Configurationin the EBOM. On this basis, through the comparison between the EBOM and the implementation BOM, the Configuration of spacecraft assembly is quantitatively controlled.
Centrifugal Effect of Thrust Plate of Water-lubricated Thrust Bearing and its Influence Mode
Authors: Zhang Haonan , Zheng Weigang , Li Fuxin 
Published: April 2020

Abstract
Water-lubricated thrust bearing with water as the medium, is a mechanical transmission medium with energy saving and environmental protection. The thrust bearing with water medium can reduce the wear of bearing and the friction between gears. At the same time, the shape of the rolling bearing in the state of high-speed operation is bound to undergo a series of changes, and the radial working clearance is also slightly changed due to the centrifugal effect under high-speed operation, which has a certain degree of influence on the thrust disc. The shielded thrust disc avoids the problem of loose sealing, and the tilting thrust bearing has the advantages of obvious centrifugal effect, large rotating inertia of the thrust disc and large bearing size. In view of the characteristics of thrust bearing structure of water medium, this study established the coupling calculation model of the thrust plate after centrifugal denatination based on the finite element analysis method, and explored the design parameters of two key clearances in the assembly structure of the thrust plate. It is found in this paper that the tilting pad bearing under low speed steering will compensate for the deformation of the thrust disc, and when the rotating speed is greater than 3600r/min, the centrifugal deformation of the thrust disc will increase in morphology and even lead to lubrication failure. Therefore, the speed is an important factor that influences the centrifugal effect of the thrust disc and the bearing disc body enlargement.
Research on the influencing factors of small bending radius elbow stamping based on CAE simulation
Authors: Lian Long , Xia Qianjin , Cao Yu , Li Xiaoxue , Su Li 
Published: April 2020

Abstract
The elbow with small bending radius is widely used in heating system and line collecting system, but its processing is difficult. Using the way of sheet metal stamping processing half elbows, and then welding the two half elbows is an effective method. There are a series of key parameters in the process of elbow stamping, which directly affect the forming result. Using sheet metal stamping software for stamping simulation, and comparing the effects of the parameters on thinning and principal stresses, we can see the specific effects of different parameters on the shaping. The main influencing factors of elbow stamping include friction coefficient, clearance, blank holding force and sheet metal thickness. For the friction coefficient and blank holder force, it should be selected near the minimum value. For clearance and sheet metal thickness, it is proportional to the forming effect.
Effects of Acute Moderate Intensity Exercise on the EEGFrontal Alpha Asymmetry
Authors: Xiao Zhangyan , Long Zhengji , Gao Pengfei , Qin Chaoling , Liu Guangyuan 
Published: April 2020

Abstract
Exercise can improve physical and psychological states efficiently. Previous studies have shown that the frontal alpha asymmetry can be used to express emotional states, while relative activity in the larger left frontal can predict positive effects. In this study, our purpose is to observe the effects of pedalling exercise (PE) on the frontal alpha asymmetry during negative stimulation. The electroence phalograph (EEG)signals obtained are processed by matlab to obtain the frontal asymmetry value. By observing and comparing the frontal alpha asymmetry between two groups, we can find that the frontal alpha asymmetry of the sports group increased significantly, while the control group have no significantly change. The study shows that the acute moderate intensity PE can improve the resistance to negative stimuli and increase positive emotions.
Fast Processing of UAV Remote Sensing Image Based on DSP Hardware Simulation Platform
Authors: Liu Fan , Guan Guixia , Zhao Haimeng , Sun Peng , Yan Lei 
Published: April 2020

Abstract
The traditional unmanned aerial vehicle (UAV) remote sensing image processing algorithm is difficult to guarantee both accuracy and speed when dealing with massive data of UAV network. This paper designs an on-the-spot processing system based on portable digital signal processor (DSP) hardware simulation platform. The bilinear interpolation algorithm is optimized and improved for the adaptability of the DSP platform with the reference of the bicubic interpolation algorithm, which is long time-consuming but high accuracy. The nearest neighbor interpolation is merged in the bilinear interpolation algorithm, which improves the edge blurring problem of bilinear interpolation algorithm. In the loop calculation of the multiplication and addition iteration calculation segment of the algorithm, the parallelism of the instruction level is increased by increasing the instruction level parallelism between the loop bodies. Experiments show that, on the basis of ensuring the accuracy of the bilinear interpolation algorithm, the execution speed of the processing algorithm is improved, which can meet the requirements of fast real-time processing of remote sensing images of complex unmanned aerial vehicles.
Load Prediction for AGV Quasi-Stop Control
Authors: Wang Guangqi , Sun Xuan 
Published: April 2020

Abstract
In the AGV variable load quasi-stop problem, in order to establish the quasi-stop mathematical model, it is necessary to judge the magnitude of the load. According to the current load characteristic of the motor, the motor output current is positively correlated with the load. For this reason, a motor current start Characteristic load prediction method is proposed. Firstly, the ARM-based AGV DC servo motor current measurement experimental platform is built according to the needs. Secondly, in order to extract the effective data, we collected the current data under different loads and analyzed the overall law of the data and, and the linear regression analysis and least squares fitting of the effective data are performed. Finally, the mathematical model between load and current is established, and the model is brought back to the AGV experimental platform to verify the model. The experimental results show that the mathematical model can predict the load and the prediction accuracy is around 5%, which proves the effectiveness of the proposed method.
Effect of Crosslinker Concentration on the Comprehensive Properties of Polyacrylamide-aluminium Citrate/Water Glass Gel
Authors: Ren Han , Qu Nannan , Wang Yunna , Qiu Xiaoxuan , Liu Qing , Chi Pengde 
Published: April 2020

Abstract
In this paper, the authors discuss the polyacrylamide-aluminum citrate/water glass gel and set the gradient on the cross-linking agent aluminum citrate to study the cross-linking agent content of polyacrylamide-aluminum citrate/water glass gel. The influence of properties, viscosity, strength and resistance characteristics, found that the water retention rate, viscosity and strength resistance of polyacrylamide-aluminum citrate/water glass gel increased first with the increase of aluminum citrate. After the reduction. Among them, when the amount of the cross-linking agent aluminum citrate is 1.2 wt%, the polyacrylamide-aluminum citrate/water glass gel performs excellent in various aspects. The optimal ratio of polyacrylamide-aluminum citrate/water glass gel is finally confirmed, which provides theoretical support for its application in coal mines.
Cellulase derived from Chryseobacterium indologenes LA4K isolated from Indonesian agar-agar industry solid waste
Authors: Munifah I , Basmal J , Kusumawati R , Irianto H E 
Published: April 2020

Abstract
Hydrolysis process can be a challenging task to perform because the required enzymes are difficult to find and microbial culture is relatively expensive. However, the process can be made more economical by utilizing enzymes which can be produced using substrates derived from local materials. One example of such materials is the solid waste generated by industries involving agar-agar which is obtained from the red alga Gracilaria sp.
Chryseobacterium indologenes LA4K is an indigenous bacterial variant which is isolated from agar-agar industry solid waste. The cellulolytic enzyme of C. indologenes LA4K was processed using a medium of 2.5% agar-agar industry solid waste which was incubated for six days and showed an activity of 0.3726 U/mL. Reaction incubation temperature exerted some influence on the activity of C. indologenes LA4K: the process produced the optimum activity of 0.3246 U/mL at the temperature of 40°C, while 30 minutes was determined as the optimum incubation period needed by both enzyme and substrate of C. indologenes LA4K to react. The enzyme entirely lost its activity when heated to the temperature of 80°C. The activity of LA4K cellulase increased with an addition of divalent ions (Mg2+, Ca2+, and Zn2+) and monovalent ions (K+ and Na+). An addition of trivalent ion Fe3+ to C. indologenes LA4K cellulase acted as an inhibitor to its activity. Addition of ethanol as an organic solvent to the supernatant crude enzyme caused the enzyme to become denatured, thus reducing the cellulase activity of its C. indologenes LA4K isolate to 85.47%. The presence of anionic detergent SDS in the crude cellulase of C. indologenes LA4K increased its activity to 105%. Addition of nonionic detergents Triton X-100 and Tween 80 to C. indologenes LA4K cellulase increased its activity to 130% and 110.9%, respectively.