bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical Wavelength-dependent THz Wave Modulation based on Graphene Coated Germanium
Authors: Li Yuanpeng , Wen Tianlong 
Published: January 2021

Abstract
Optical Hz wave modulator based on semiconductor is broad used in THz imaging area due to convenient to realize. However, for a long time, the laser wavelength influence to the modulation properties is not clear. Germanium and graphene coated germanium upon different laser wavelength (638, 915 and 1550 nm) laser irradiation were investigated to clear the above influence. As a result, the THz wave modulation depth increase with the laser wavelength due to the surface recombination. And the results were proven by discussing the modulation enhancement of graphene coated germanium. In addition, the short wavelength laser would lead to slow modulation rate. As a result, it is a novel method to improve the THz modulation depth and modulation rate by using long wavelength laser.
Design of Screw Type Automatic Apple Juicer
Authors: Wu Changzhong , Ge Fan , Shang Guangchao , Wang Guitao , Zhao Mingpeng , Wu Liang , Guo Hengshuai 
Published: January 2021

Abstract
Based on the actual juicing test, aiming at the problems of low juice yield, easy jam of fruit dregs and difficult cleaning of juicer, a series of researches on automatic Apple Juicer were carried out, and the structure and function of main components were designed and optimized. It mainly includes the design of screw structure for the juicer, the structural design and parameter calculation for the screw rod to increase the pressing force on the fruit during juicing and improve the juicing rate; the design of separable structure for the extrusion cylinder to solve the problem of unsmooth slag discharge and realize the effective cleaning of the internal structure of the juicer. The design can automatically extract apple juice, effectively improve the juice yield, realize the separation of fruit dregs and juice, and automatically carry out effective cleaning, which is suitable for the automatic sales system.
A Potential Domestic Shrimp Deveining Machine Based on Reciprocating Motion of the cutting tool
Authors: Wang Shufan 
Published: January 2021

Abstract
This article proposes a design of a potentially feasible small-size domestic automatic shrimp deveining machine. In this design, a laser rangefinder is utilized to measure the shrimp’s thickness to determine how deep the cutting tool should cut into the shrimp. The specialized cutting tool, which is composed of a blade and a spoon, then cuts the shrimp’s back and exposes the shrimp vein so that the spoon can devein it later. By using SolidWorks and SolidWorks Simulation Animation, this design proves to be practical and has commercial potential.
Mechanical Fault Diagnosis Methods Based on Convolutional Neural Network: a Review
Authors: Zhang Tianzhe , Dai Jun 
Published: January 2021

Abstract
Deep learning is good at abstract features from massive data and has good generalization ability, which has attracted more and more researchers’ attention. The Convolutional Neural Network (CNN) is a classic structure of deep learning and which is being widely and successfully used in the fields of computer vision, target detection, natural language processing, and speech recognition. Based on a detailed analysis of the current status and needs of mechanical system fault diagnosis, this paper introduces the structure of CNN and summarizes the application of CNN in the field of mechanical faults from the aspects of input data type, network structure design, and migration learning. The problems of deep feature extraction and visualization are also discussed, and finally, the difficulties in mechanical fault diagnosis are analyzed and several problems to be solved in the field of mechanical fault diagnosis based on CNN prospect.
Research on Single-phase Grounding Line Selection Method for Distribution Network Containing New Energy
Authors: Liu Shen , Wang Shudong , Ma Chunlian , Wang Hao , Li Runqing 
Published: January 2021

Abstract
With energy shortages and environmental pollution problems becoming more and more serious, new energy electric energy has been rapidly developed and applied in the power system. Since most new energy electric energy needs to be connected to the power distribution system through an inverter device, this type of new energy electric energy is called an inverter-type distributed power source. With the access of distributed power sources, the power distribution system has changed from a single power source to a multi-power source system, and the system structure has changed. This brings great challenges to relay protection and fault line selection in the distribution network. Therefore, this article discusses the problem of single-phase grounding fault line selection in distribution network with inverter-type distributed power generation.
Study on the coupling effect of laser and diamond tool
Authors: Mingqiang Xia , Guangfeng SHI , Jiaolong BI , Jiyu GAO , Dawei YU , Guoquan SHI 
Published: January 2021

Abstract
In the process of turning hard and brittle materials with laser in-situ assisted diamond tools, the energy of the laser beam will be lost and the laser heat absorbed by the diamond tools will produce temperature fields and thermal deformations, which will affect the machining accuracy. In order to study the interaction between laser and diamond tool during laser in-situ assisted turning, a finite element model of laser and diamond tool transmission was established using COMSOL Multipysics, and the energy deposition formed on the rake face under different incident conditions was analyzed. The temperature field changes and the rule of tool tip deformation of diamond tools during laser irradiation are shown. Studies have shown that the greater the negative rake angle of the tool, the greater the power density deposited by the laser on the rake face. When the incident angle of the laser is 20°, the power density of the laser on the rake surface reaches the maximum. Under the laser irradiation, the temperature and the deformation of the tool tip increase with time, and finally reach a steady state. The research provides theoretical basis for improving the precision of laser in-situ assisted diamond processing.
Design and Implementation of Polarity Testing System of Contact-less Solenoid Valve Based on Wireless Sensor Networks
Authors: Li Yue , Zhang Xiaodong , Zhang Teng 
Published: January 2021

Abstract
Solenoid valves are important control components in industrial production and are used in various aerospace vehicles. In view of the characteristics and requirements of the solenoid valve polarity test of the launch vehicle power system, combined with some current research on magnetic flux leakage detection, and considering the difficulty of operation, a design scheme of a contact-less solenoid valve polarity test system based on Wireless Sensor Networks (WSN) is proposed. The solenoid valve of the launch vehicle was tested and verified. The system organically combines wireless sensor network technology, leakage magnetic field measurement technology, and rapid monitoring and interpretation technology. It has the characteristics of miniaturization, portability and cable-free. The software interface of the test instrument is more concise and beautiful, and it is accurate to the solenoid valve polarity system. Degree, portability, test coverage and user experience have all been significantly improved, which has important reference significance for the application of subsequent wireless test technology in other space vehicle tests.
Design and mechanical behavior analysis of clamping device of carbon fiber sucker rod working vehicle
Authors: Yan Wenhui , Xie Dong , Li Jie , Yuan Hengtong , Peng Yong 
Published: January 2021

Abstract
This paper optimizes the design of the clamping device of the carbon fiber sucker rod operating vehicle, aiming to improve the shearing problem when the carbon fiber sucker rod enters the clamping device. The structure of the clamping device is designed; Finite element software was used to simulate the state of the clamping device during actual work, the maximum displacement position of the carbon fiber sucker rod and the stress change curve of the sucker rod in the clamping device are obtained; Reasonably adjust the load distribution of the hydraulic cylinder according to the stress change curve of the sucker rod in the clamping device, so that the sucker rod in the clamping device bears a reasonable stress change, which is beneficial to reduce the shear of the sucker rod just entering the clamping device effect. The analysis shows that in the clamping device, the stress of the sucker rod is the largest when it just enters the clamping device. The load of the three hydraulic cylinders of the moving rail gradually increases from bottom to top, which can make the sucker rod bear the force uniformly and can improve the shear problem when the sucker rod just enters the guide rail.
Optimization of Aircraft Part No-Return Manufacturing Process Based on Value Stream Analysis
Authors: Haijun Yin , Yingji Shan 
Published: January 2021

Abstract
To target aircraft part manufacturing processes, this article analyzes the shortcomings of aircraft part “return” manufacturing process, and proposes the improvement solution of “no-return” manufacturing process optimization. By adopting measures, such as to cancel “returned” part hand-over, add work assignment to heat/surface treatment shop, add production schedule control by heat/surface treatment shop and improve part identification, etc., part fabrication cycle is reduced and part quality is improved. Based on the analysis and verification of value stream mapping before and after the improvement, the target of process optimization and restructuring is achieved.
Dispersion of Graphene Oxide in Saturated Ca(OH)2 Solution by Using Different Water-reducing Agents
Authors: Wang Yanan , Li Xiangyu , Chen Ya , Liu Zhuopeng 
Published: January 2021

Abstract
As a two-dimensional nano-material, graphene oxide (GO) has been found to be promising on improving properties of cement based materials. However, GO is prone to be agglomerated in the cement matrix. In this study, three different water reducing agents, including two polycarboxylate-based superplasticizers (PC1, PC2) and calcium lignosulfonate (CS), were used to study their effects on dispersion of GO in saturated Ca(OH)2 solution by conducting UV-vis analysis. The results showed the dispersion of GO can be largely improved when the mass ratio between PC1, PC2, CS and GO was 4:1, 4:1, 6:1, respectively. The UV absorptions increased with increase of the ultrasonication duration. When the ultrasonication was 10 minutes, CS showed better performance on the dispersion of GO. The dispersion of GO modified with PC1 can be improved by increasing the ultrasonication amplitude; while the amplitude showed little effect on the dispersion of GO modified by PC2 and CS.
Design of Three-chamber Ball Mill
Authors: Shang Guangchao , Wu Changzhong , Guo Hengshuai , Wu Liang , Wang Guitao , Zhao Mingpeng 
Published: January 2021

Abstract
Ball mill is a kind of raw material processing machinery which plays the role of grinding. Its working principle is that the movement and force are transmitted to the barrel of ball mill through reducer, transmission shaft and hollow shaft by motor. Through the continuous turnover movement of the cylinder, the grinding medium inside the cylinder is driven to crush and grind the materials. So as to obtain the product with suitable particle size. According to the specifications and parameters of the ball mill, the general layout, grinding body, lining plate, partition device, support device, transmission part and feeding and discharging device of the ball mill are designed. In this paper, the design method of three chamber ball mill is introduced. Comchambered with the design of Φ 3.5 × 13m three-chamber ball mill, the design process of ball mill is described in detail.
Analysis on affecting factors of magnetorheological finishing
Authors: Hao Lanfang , Liu Zhongling , Li Shixu , Zhu Ruiyu , Zhu Xuli 
Published: January 2021

Abstract
A magnetorheological finishing experimental device was designed and fabricated to explore influencing factors during polishing process. The device consists of the subsystems of mechanical transmission, workpiece clamp, magnetorheological fluid circulation and magnetic excitation. Magnetorheological fluids of different carbonyl iron volume ratio were prepared to research the effects with different workpiece speeds, polishing wheel speeds during magnetorheological finishing. The material of the workpiece is K9 glass. Experiment results show that the material removal rate increases with the workpiece speed and the speed of the polishing wheel. The increasing of volume ratio of carbonyl iron can also increase the material removal rate when the volume ratio is low, but the removal rate decreases when the volume ratio of the carbonyl iron powder reaches high value.
Analysis of single phase ground fault characteristics of low resistance ground active distribution network
Authors: Wu Na , Liu Zihui , Fan Shuxian , Dong Longjing , Yang Zhengxian , Zhou Chengxiang 
Published: January 2021

Abstract
A large number of distributed generators access to low resistance grounding system may have great influence on the fault characteristics of single phase ground. In view of low resistance ground active distribution network, the connection mode of Inverter-interfaced Distributed Generators (IIDG) is discussed comprehensively based on operation safety and protection requirements. The equivalent model of IIDG and simplified zero sequence network model of low resistance grounding system contain multi-IIDG for single phase ground fault are established. The amplitude and phase characteristics of zero sequence current in single phase grounding fault of the system and the characteristics of high-resistance ground fault are analyzed. Simulative results by MATLAB/Simulink verifies the correctness of the analysis results of fault characteristics. The conclusions could be provided as reference for solving the grounding protection of system with high penetration of distributed generator.
Fatigue analysis of airfoil under different working conditions
Authors: Xu Y , Zhang Y , Sun M 
Published: January 2021

Abstract
Within the flight mission envelope, the wing receives different aerodynamic loads in each mission stage, which results in bending and torsion alternating stress, which is prone to deformation or fatigue damage, threatening flight safety. Therefore, it is necessary to predict the fatigue life of the wing structure and maintain it in time to avoid accidents. Fluent software is used to analyze the aerodynamic load state of the wing when the lift-to-drag ratio is the largest under the three conditions of the climb, level flight, and landing, as the loading load of the wing, analyze the stress and strain of the dangerous points at each stage based on the finite element analysis platform, and determine Multiaxial fatigue state. The Brown-Miller multiaxial fatigue analysis method based on the critical surface was adopted, and the fatigue life analysis was carried out using the Fe-safe software and the Abaqus software. The results show that the minimum lifespan first appears at the root of the wing. In the Fe-safe analysis, the design life of the given wing structure is 40000 cycles, and the minimum life of the wing structure is calculated to be 58420 cycles, longer than the design life, and the life safety factor is 1.078, basically in line with the actual situation.
Research on security attack technology and detection method of RFID tag chip in intelligent electric meter
Authors: Wang Rui , Gong Qiujing , Zhen Ke , Hou Xing Zhe , He Min , Wang Ling Yu 
Published: January 2021

Abstract
This paper introduces the security threats faced by RFID chips of intelligent electric meters firstly, and then focuses on the attack principle and security detection methods of Side-Channel Attack, which are elaborated from four aspects: non-contact RFID card test, fault-injection test, software and hardware cooperative detection and physical detection.
An Air-Water Integrated Auxiliary Navigation System for Complex Waters
Authors: Shuang Xuecheng , Zhang Yan 
Published: January 2021

Abstract
The auxiliary navigation device described in this paper can effectively make up for the shortcomings of the existing navigation mode. It has designed a targeted detection module for various unstable factors in complex waters, such as large ship flow, frequent water level changes, low visibility, hidden reefs and floating ice. With the advantages of both water and air, excellent navigation performance and all-round detection means on water and underwater, the device can achieve excellent auxiliary pilot effect. In addition, the device has the advantages of low operation difficulty, short training period, high safety, good social and economic benefits, which is suitable for wide range promotion in navigation areas such as ports, inland rivers and coastal areas.
Network Security Risk Assessment of CPS System in Distribution Network Based on Attack Graph
Authors: Gangjun GONG , Peng ZHANG , Bo ZHOU , Ren QIANG , Yue SUN , Leran CHEN , Wei CHEN 
Published: January 2021

Abstract
With the development of advanced information and communication technology and intelligent control technology, the modern distribution network has gradually developed into a cyber-physical system of the distribution network, which also brings about the impact of information-side network security threats on the coupling failure of the physical-side power grid. In this context, a method for quantitative assessment of the network security risk of the distribution network CPS system suitable for the principle of power security protection is proposed. First of all, the physical architecture model of a typical distribution network information physical system was built; Secondly, for system network attacks, the attack path data stream related to device vulnerabilities is established, the attack behavior process is modeled based on the attack graph, and the series-parallel model is combined to calculate the success probability of attacking the target circuit breaker; Finally, the article takes the loss of load caused by the action of the attack circuit breaker as the physical consequence to quantify the risk value of the system and complete the network security risk assessment of the system.
First Order Sensitivity Calculation of Car Door Based on Combined Approximate Reanalysis Method
Authors: Feng Rui , Jin Yuchen , Yang Xiaochen , Guo Guikai 
Published: January 2021

Abstract
The reanalytic calculation method is a highly efficient method of reanalysing the modified structural performance, and initial structural information are used in the structural design process (optimization and modification). This method can avoid the complete analysis of the modified structure and significantly reduce the computational cost. In order to improve the efficiency of iterative calculation in the reanalysis of the door structure, this paper takes a car door as an example, and compares the sensitivity analysis with the combination of the approximate reanalysis algorithm and the current mainstream commercial software, and the calculation accuracy of the reanalysis method in this paper is verified by calculation examples.
Analysis of the Cause of Leakage Oil Defect in a Voltage-Dividing Capacitor of a 500kV Porcelain Circuit Breaker
Authors: Yang Xuefei , Li Hongkun , Wu Chunhong 
Published: January 2021

Abstract
In recent years, with the development and construction of the power grid system, the porcelain column circuit breaker has been popularized and applied in the 500kV substation. However, in the actual operation and maintenance process, the leakage of oil has been found in the grading capacitor. The disassemble of an oil leakage grading capacitor of a 500kV porcelain column circuit breaker is analyzed in this paper. Through carrying out the sealing test; the insulation performance test; salt spray test and simulation test. At the same time, by comparing the sealing ring and cover plate material; calculating the potential difference of the cover plate and researching electrochemical corrosion factors. We can come to an conclusion that the cause of a suspected the grading capacitor oil leakage is the oil accumulation; and the main reason for the oil leakage problem of the grading capacitor is the electrochemical corrosion phenomenon on the sealing cover plate. Finally, on the basis of the reasons, the relevant rectification measures are put forward.
Study on Corrosion Behavior of as-forged AZ81 Mg alloy in different concentrations of NaCl solution
Authors: Cao Fenghong , Qin Zhaohui , Xu Yaohui , Chen Chang 
Published: January 2021

Abstract
In this paper, the microstructure of as-forged AZ81 Mg alloy before and after heat treatment was analyzed by means of optical microscope and XRD, the corrosion behavior of as-forged AZ81 Mg alloy after heat treatment with different concentrations of NaCl solution was studied by static immersion weight loss method. The results show that: after solution aging heat treatment at 400°C×0.5h+200°C×20h, the grain size of the alloy is more uniform, but the effect on the average grain size is not obvious; when the corrosion time is fixed, the corrosion rate of as-forged AZ81 Mg alloy increases rapidly with the increase of NaCl concentration; with the extension of corrosion time, the corrosion rate of as-forged AZ81 magnesium alloy increases in a fluctuating manner, and then in a fluctuating decreases after reaching the peak value, and after 72h of etching, the corrosion rate of the alloy is basically unchanged; meanwhile, the corrosion in as-forged AZ81 magnesium alloy shows obvious filamentous propagation characteristics, and these filamentous corrosion characteristics basically extend and distribute along the grain boundary.
The forming tool, primary start position and toolpath angle movement effect on the geometry accuracy “springback”, part C
Authors: Abass K I 
Published: January 2021

Abstract
Incremental Forming process, IF is a technology for producing 3D-dimensional complex sheet profiles. The advantages of the process involve simple set tools, fixture and forming tool, shorter time for producing the pattern, and flexibility. While the main limitation of the process is the springback that represent geometry accuracy, the part profile precision limits the difficulty of forming toolpaths, including the wall angle. This work presents the forming toolpaths effect in the IF process. The supporting space and the product base dimension including wall angle is used to study the springback effect through the incremental forming process. Sheet metals Aluminium-A1025 are used for manufacturing the products. The research goals are to comprehend the springback defect behaviour which is affected by the supporting space-toolpath angle and the supporting space-product base ratios. The strain distributions and the thinning percentage of the final product section have been considered and analyzed in detail.