bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Augmented Reality Technology and Artificial Intelligence Satellite Communication Equipment in Power Grid Emergency Training
Authors: Zheng Songyuan , Zhang Min , Zhou Haichang
Published: December 2021

In recent years, more and more fast-developing high and new technologies have gradually penetrated into the power grid emergency of satellite communication equipment training, and Augmented Reality (AR) technology and Artificial Intelligence (AI) are one of them. The power communication network is an important means to ensure the safety, stability, and economic operation of the power grid, and it is also an important infrastructure for the entire power grid. Power grid emergency training is particularly important for improving the ability to respond to emergencies. The purpose of this article is to study the application of AR technology and AI satellite communication equipment in power grid emergency training. This article first analyzes the demand for training content of power grid emergency training for satellite communication equipment training. Through questionnaire surveys and interviews with relevant experts and emergency rescue teams, it summarizes the training content suitable for the application of AR technology and AI technology for power grid emergency. Then, by introducing the key technologies of the power grid emergency training of satellite communication equipment training, the application of AR technology and AI in the power grid emergency training of satellite communication equipment training is completed. The training effect data shows that 68% think that the training can improve the motivation of training by using this technology, 74% think that the overall effect of the training is good, and 66.3% think that the skill improvement effect is good, which verifies that the technology is used in power grid emergency training. It is worth promoting.
Application of Augmented Reality (AR) Technology in Low-Voltage Line Interruption Training and Power Grid Emergency Training
Authors: Bi Mingli , Zhang Min , Zhou Haichang
Published: December 2021

Augmented reality technology uses computer performance to create a virtual scene and accurately integrate the virtual scene with the real world, and finally uses a video projector to present the virtual and real scene to the user, thereby significantly improving the user’s visual experience and Feeling knowledge. Therefore, augmented reality technology can be well applied to training companies. The use of virtual reality and augmented reality technology in the aerospace, construction and shipbuilding industries has achieved remarkable results, and the era of augmented reality applications in the power grid has also arrived. With the development of mobile terminals such as mobile phones, it has become an excellent platform for augmented reality applications. This article focuses on the application of augmented reality (AR) technology in low-voltage line interruption training and network emergency training. First, the basic technology of augmented reality (AR) and the application of augmented reality (AR) in power grid emergency training are introduced using bibliographic research methods. Then design a network emergency training system for low-voltage disconnection training, and finally test the algorithm used in this article. The detection result shows that the detection of feature points using AGAST takes less than 3ms, while the Shi-Tomasi operator is about 20ms. It can be seen that the use of AGAST operator to detect feature points has a great improvement in speed.
Application of Augmented Reality (AR) Technology in Power Grid Emergency Training
Authors: Pan Qishen , Zhang Min , Zhou Haichang
Published: December 2021

Strong reality has been applied to training operations, and the use of virtual and augmented reality in aerospace, manufacturing and shipbuilding industries has yielded significant results. This paper mainly studies the application of Augmented Reality (AR) technology in power grid emergency training. This paper designs and implements an intelligent operation and maintenance system based on mobile augmented reality under the Android operating system. Augmented reality technology is applied to substation equipment operation and maintenance. Through the design and development of modules such as data management, equipment identification, holographic display of equipment information, integrated management and remote assistance, the application of Augmented Reality technology in substation equipment operation and maintenance is realized. Based on augmented reality and identification technology, the auxiliary information is transmitted to the intelligent terminal display of field operators in real time to assist the power grid emergency training and improve efficiency.
RETRACTED: Design of Double-effect Propulsion System for News Broadcast Based on Artificial Intelligence and Virtual Host Technology
Authors: You Yuanyuan
Published: December 2021

A virtual host refers to a host who uses an avatar to submit contributions on a video website. The virtual host is a powerful combination of artificial intelligence technology and live broadcast. In recent years, virtual video hosts have sprung up on major video websites, and their popularity is growing rapidly. Virtual host technology has been applied to many areas of society. Based on this background, this article designs a news broadcast double-effect propulsion system based on artificial intelligence and virtual host technology. This article applies the virtual host technology to the field of news broadcasting, and realizes the double-effect advancement of virtual host technology and news broadcasting. The virtual host designed in this article mainly uses sign language to broadcast news, so this article first conducts a quick and brief knowledge of sign language, and then conducts a detailed analysis of the current research status of virtual host technology and artificial intelligence technology, and uses artificial intelligence. The technology realizes the motion control of the virtual host; then the intelligent algorithm is used to realize the superimposition and synthesis of videos, and a news broadcast double-effect propulsion system of artificial intelligence and virtual host technology is designed. Finally, this article carried out an experimental test on the system’s simultaneous broadcast function and channel switching function. The test results surface excluded subjective human factors. After the improvement, the system can achieve simultaneous broadcast and successful channel switching.
Study on Performance Optimization and Physical Properties Testing of a New Type of High Thermal Conductive Damping Coating
Authors: Chen Wei , Hu Sheng , Zhao RuiDun , Xie Yine , Cao Hao
Published: December 2021

Surface coating of damping paint is a common method to suppress structural vibration and reduce noise, but damping paint has poor thermal conductivity which limits it’ s application to transformers, reactors and other equipment that have high requirements for heat dissipation. In this paper, a new type of high thermal conductivity damping coating is prepared by emulsion polymerization, among which, a polyurethane emulsion with internal cross-linking structure and an acrylic emulsion with polymerization function are used as main agents, mica powder is used as the main damping function filler. By adjusting the proportion of non-metallic thermal conductive filler Al2O3 and thermal conductive fiber to explore the influence of different thermal conductive fillers on the thermal conductivity and damping performance of the damping coating. The paint is applied to aluminum and iron plates, and the sound insulation capacity is tested to study the influence of paint thickness, fiber addition, fiber type, viscoelasticity, and temperature aging on the sound insulation performance of damping sound insulation panels. The test results show that by adding thermally conductive filler Al2O3 and thermally conductive fibers, a thermally conductive network chain is formed inside the damping coating, which greatly improves the thermal conductivity of the coating while ensuring the damping performance and the effect of vibration and noise reduction.
First principles study of IIIA atoms adsorbed on ZnO (0001) surface and the applications in optoelectronic devices
Authors: Zhang Haifeng , Cheng Caiping , Wang Bin
Published: December 2021

First principles method is used to study the adsorption behavior, formation energy and electronic structure of IIIA (B, Al, Ga, In) atoms adsorbed on Top, T4 and H3 sites of ZnO (0001) surface. The date shows that the formation energy of B, Al, Ga and In atoms adsorbed on Top site is highest, then followed by T4 site, and H3 is a more stable adsorption site. With the periodic increase of B, Al, Ga and In atoms, the formation energy of corresponding models decreases gradually, and the binding ability with O atoms also decreases gradually. The electronic structure of ZnO (0001) surface is sensitive to the adsorption sites. When these atoms are adsorbed on Top sites, the electronic structures of B-Top, Al-Top, Ga-Top and In-Top models have a little change compared with ZnO (0001) surface. However, when these atoms are adsorbed on T4 and H3 sites, the impurity states appear on the VBM, which narrowing the band gap of the corresponding models.
Design of intelligent variable speed warehouse carrier system based on ARM SCM
Authors: Yang Haojun
Published: December 2021

Aiming at the problem of motion instability caused by the climbing of intelligent vehicles in the process of warehouse transportation, a design of intelligent variable speed warehouse transport vehicle system was proposed. STM32F103C8T6 single-chip microcomputer is used as the core controller of the intelligent variable speed car. The hardware circuit of the system is composed of power module, servo motor module, ultrasonic sensor module, infrared sensor module, MPU6050 gyroscope, motor drive and other modules. At the same time, the software test of vehicle downhill intelligent transportation, tracking detection speed and differential steering conditions is completed. Finally, the performance of the car is verified, and the results show that the smart car has achieved high stability of avoidance tracking, speed and other key functions. It is a downhill process, which has a lot of practical value.
Small Diameter Tube Post-Weld Heat Treatment Process with Brinell Hardness and Microstructure Inspection
Authors: Qi Xiangqian
Published: December 2021

The local post-weld heat treatment (PWHT) process test of 9Cr-3W-3Co small-diameter pipe welded joints was carried out using rope-type resistance heaters with different parameters, and the Brinell hardness test and microstructure observation were carried out on the welded joints after heat treatment. The results show that when the heating width was 200mm, the constant temperature was 790°C-800°C, and the constant temperature time was 2 hours, the Brinell hardness of the weld was in the range of 246HBW-265HBW, which had good performance. After tempering at 760°C-800°C, the welds all showed a clear tempered lath martensite.
Comparison and Evaluation of Domestic and Foreign Radiation Environmental Standards for Nuclear Power Plants
Authors: Yu Jiahuan , Zhang Xiaofeng
Published: December 2021

With the development of the nuclear energy industry and the increasing demand for environmental protection, the impact of nuclear power plant radiation on the environment has gradually entered the public view. This article combs the nuclear power plant radiation environmental management systems of several countries, takes the domestic and foreign management of radioactive effluent discharge from nuclear power plants as a starting point, analyses and compares the laws and standards related to radioactive effluents from nuclear power plants in France, the United States, China, and South Korea. In this paper, the management improvement of radioactive effluent discharge system of Chinese nuclear power plants has been discussed.
Analysis on radiation control and the impact of land pipeline leakage of offshore nuclear power plant on groundwater
Authors: Liu Lianghui , Yu Jiahuan , Xu Yueping
Published: December 2021

Using the groundwater migration and dispersion analytical model, combined with the topography and groundwater characteristics along the land drainage pipeline of an offshore nuclear power plant, the migration and dispersion of six radionuclides (3H, 14C, 137Cs, 134Cs, 60Co, 90Sr, etc.) in groundwater under the condition of pipeline breach accident are predicted. The scope of impact of radionuclides and the annual effective dose caused by drinking water pathways to the public are analyzed. By summarizing the radionuclide concentration and dose index requirements for groundwater at home and abroad, the corresponding environmental impact assessment is given. The prediction results show that the radionuclide concentration and public effective dose at the same distance first increase and then decrease with time, and the peak radionuclide concentration and maximum public effective dose gradually decrease with distance increasing, in other words, the impact of the breach accident on the distance above 30 m is limited.
Effect of Powder Feeding Rate on the Forming Quality of Alloy by Laser Melting Deposition
Authors: Duan Chenghong , Zhang Yinzhou , Luo Xiangpeng
Published: December 2021

12CrNi2 alloy steel was prepared by Laser Melting Deposition (LMD) technology, and the effect of powder feeding rate on surface quality, internal defects, microstructure, and microhardness of the single track and manufactured part were investigated. The results show that the metallurgical bonding of the single track deteriorates, the surface quality of the manufactured part is improved, the average microhardness of the manufactured part increases, and the number of pores first decreases and then increases with the increase of powder feeding rate. At the lower powder feeding rate, the manufactured parts have larger pore defects, while at the higher powder feeding rate, the manufactured parts have poor fusion defects. The main phase composition of the manufactured parts is ferrite(F), granular bainite (GB), and pearlite(P), and the manufactured part has finer grains at the higher powder feeding rate.
5G-V2X Based Traffic Safety Warning System through Mobile Sensor and Wireless Communication
Authors: Liu Yu , Wang Xinzheng , Zheng Huiling
Published: December 2021

This project designs a traffic safety early warning system based on 5G-V2X for the current situation of increasing traffic accidents in China, which concentrates on two modules of V2V (vehicle-to-vehicle), V2I (vehicle-to-road) for early warning system design, with OBU (vehicle communication unit) and RSU (roadside communication unit) based on 5G-V2X communication technology to establish vehicle-to-vehicle and vehicle-to-road interactive communication, and realize V2V collision warning and V2I traffic light emergency event warning at intersections through collision risk warning algorithm and intersection passage assistance algorithm, thus alerting drivers to avoid dangerous situations and reducing the incidence of traffic accidents.
Application of Fuzzy Analytic Hierarchy Process and Three-Dimensional Terrain Model in Traffic Routes Selection
Authors: He Xinpeng
Published: December 2021

The selection of a road route plan is an essential preliminary task. The choice of the route greatly influences its function, role in the road network, economic development of the areas along the route, and the return on investment. In this paper, qualitative analysis and evaluation of the details of the proposed route options in terms of ecological environment and engineering economy are carried out through fuzzy hierarchical analysis, based on the route data from Bushang to Bizhou, to combine the principles of the routes and develop several route options. Among the pre-determined route options, screening and comparison are carried out, and Option II is proposed as the recommended route.
Numerical simulation and experimental study on valveless piezoelectric pump with triangular obstacles
Authors: Sun Yeming , Wang Yu , Wang Yiwei
Published: December 2021

A valve less piezoelectric pump with triangular obstacles is designed and manufactured, which uses piezoelectric vibrator as power source. The working principle and theoretical flow rate of the valveless piezoelectric pump are analyzed, and its flow rate expression is derived. The flow resistance characteristics of triangular obstacles are simulated by numerical simulation. Based on the mass fraction distribution of liquid water, the forward and reverse flow resistance of triangular obstacles and the influence of triangular obstacles on pumping capacity are analyzed. Finally, two groups of test prototypes of the valveless pump are made by using the engraving machine, and the flow measurement test is carried out. The experimental results show that the valveless piezoelectric pump with triangular obstacles can realize the valveless pumping function, and the pumping flow per unit time increases with the increase of triangular obstacles in the channel, and decreases with the increase of the distance between triangular obstacles and the channel. When the driving voltage is 140V and the driving frequency is 10Hz, the maximum output flow of the piezoelectric pump is 16.26ml/min.
Contrastive Studies of Z-Source Converter and Boost Converter on Photovoltaic Maximum Power Point Tracking System
Authors: Li Yuansong , Gao Bo
Published: December 2021

Aiming at a series of issues on traditional boost converter which commonly used in photovoltaic maximum power point tracking (MPPT) devices, such as the limited output voltage, the low boost efficiency, the excessive heat generating, this paper proposed a novel z-source converter. Compared with traditional boost converter, several researches have done among topology structure, operational principle, boost factor. Based on the theoretic analysis, this paper given two schemes of photovoltaic MPPT system which using boost converter and z-source converter, the models of them are established based on Matlab. The simulation results indicate that the duty-ratio of photovoltaic MPPT system based on z-source converter is smaller, the stability of MPPT is better. The novel z-source converter can fundamentally solve the issues caused by traditional boost converter in photovoltaic MPPT devices, and it has incomparable advantages than traditional boost converter in the field of photovoltaic power generation.
Design of intelligent power distribution robot system based on machine vision
Authors: Chen Wenqi , Liu Fenggang
Published: December 2021

With the increasingly serious aging of our society, labor shortage will seriously hinder the development of social economy. Robots gradually integrate into human production and life, and gradually serve more and more people. In order to solve the problem of large path deviation of the transmission system in the food conveying path, an intelligent food conveying system based on machine vision is proposed. The hardware circuit of the whole system is composed of image acquisition module, power module, electric drive module, etc. in the software part, the vertical volume matching method is used to set the optimal path. Through practical investigation, the scheme is feasible, can rely on the actual intelligence of catering distribution, has good application and promotion value.
Design of a grasping robot control system using kinematics model
Authors: Chen Wenqi , Liu Fenggang
Published: December 2021

Aiming at the problem of mechanized and repeated parts grasping, and aiming to reduce the development cost, this study added an end-effector and designed a ROS-based grasping robot control system on the basis of fully analyzing the structure and workflow of the robot. The grasping robot can be controlled and monitored in real time by operating on the RVIZ interface. According to the needs and process of grasping work, the control system process design and control system programming of the robot are completed. Subsequent simulation experiments and real object control experiments show that the control system has high robustness and real-time performance. The control system can meet the task of mechanization and repeated parts grasping, and can effectively improve the production efficiency, enhance the competitiveness of enterprises, and reduce the cost of enterprises.
Precise Linear Positioning Method Based on Transmissive Two-Stage Diffraction Grating System
Authors: Lu Jin , Lu Jiannan , Ma Jun , Gong Zaiyan
Published: December 2021

This paper mainly studies the precise linear positioning method based on the transmissive type two-stage diffraction grating system. Starting from the analysis of the two-stage diffraction principle, the mathematical model of the two-stage grating diffraction is established, and the positioning characteristics of the differential positioning method and the modified positioning method are discussed. The simulation experiment of the linear positioning device is carried out to study the displacement characteristics. The experimental results show that the precise positioning based on the diffraction grating can obtain a positioning accuracy of ±0.4 μm.
Design of linear phase shifting transformer based on linear motor
Authors: Jie Xue , Zhao Jinghong
Published: December 2021

In this paper, a linear phase shifting transformer based on linear motor is studied. The transformer is composed of four groups of three-phase full-bridge inverter system and a linear core. The DC power supply can be converted into three-phase alternating current through the inverter system and the linear phase shifting transformer. Compared with the traditional phase-shifting transformer, the linear phase-shifting transformer is easy to expand, easy to connect, and has better heat dissipation. The simulation results show that this scheme is feasible.
A heap strategy for UAV deployment issues under mobile terrestrial wireless communication networks
Authors: Li Yanlin
Published: December 2021

Unmanned on-board mobile base stations (MBSs) can more effectively solve wireless connectivity problems in terrestrial communication networks without fixed infrastructure. The purpose of this article is to minimize the number of MBS required to provide wireless coverage for a set of distributed ground terminals (GTs). Traditional clustering algorithms are no longer applicable because each drone has a different coverage area size and the traditional K-Means clustering algorithm has no limit on the number of heaps that can exceed the maximum coverage area of a single drone, making it impossible for a drone to provide services. In response to this problem, the traditional K-Means clustering algorithm is optimized, and the results of the optimized K-Means clustering algorithm are stacked to ensure that each pile has the corresponding drone capability to serve it.
The progress of mini black holes: principles and analytical astronomical observation techniques
Authors: Tan Jiatong
Published: December 2021

Mini-black hole (MBH) is a concept first proposed by Stephen Hawking in the 1970s. Normally, exploring MBHs will enhance the understanding of quantum theory and gravity theory as well as be helpful in predicting the configuration of the early universe. Based on information retrieval, this paper summarizes the progress of MBHs and takes three major aspects: background, models, practical methods for observations, and analysis. Specifically, the descriptive equations are derived, and different models are discussed separately. These results shed light on the prospective development of quantum field theorem, general relativity, and string theory.
The added water control system based on neural network model and double parameter corrected for loosening and conditioning cylinder
Authors: Li Zijuan , Chen Jiaojiao , Gao Yang , Jia Xiaohui , Zhao Liyuan , Feng Zixian
Published: December 2021

In order to improve the stability of outlet moisture in the of loosening and conditioning cylinder, we concentrate on loosening and conditioning cylinder, and design the prediction model of the added water volume based on neural network technology and the double parameter corrected control system of material balance and moisture deviation for loosening and conditioning cylinder by using historical production data. Taking the set value of inlet and outlet moisture of the loosening and conditioning cylinder as the input factor and the added water volume as the output factor, the prediction model of the added water volume was to predict the total volume of the added water. When there was a big deviation between the actual value and the set value of outlet moisture, the double parameter corrected control system of material balance and moisture deviation was used to correct the deviation, so as to improve the outlet moisture stability and the control accuracy of the added water volume. Using Cigarette brand “diamond (hard-case Yingbin)” produced by Zhangjiakou cigarette factory to built model and analysis, the results showed that after the improvement, the standard deviation of output moisture of loosening and conditioning cylinder reduced by 0.27%, and the control stability and the control level of production process were improved.
The Progress of Black Holes: Principles & Physical Detection Technology
Authors: Chen Tianyi , Ge Shutong , Li Jiahui , Ma Xuheng
Published: December 2021

Humans have been trying to explain black holes since the 19th century, using theoretical understanding and observations of the universe. Incandescent body thermal radiation has been the focus of extensive theoretical and experimental research for over a century. This paper will discuss the concept of a black hole and use information retrieval to generate a panoramic image of it. The content illustrates black holes from three different perspectives: description of black holes using mathematical methods and data, models, and detection. A black hole is a controversial object, and no one knows for sure what it is. Indeed, multiple numerical simulations have been carried out to investigate the critical behaviors of black holes with various geometrical configurations in arbitrary dimensions. We will sum up the black hole knowledge so far and discuss the recent progress in terms of black hole exploration, i.e., shed light for future black holes model construction and detection.
A Study on the detection and formation mechanisms of ultra-massive black holes
Authors: Rao Hongyu , Wang Zhongqi
Published: December 2021

With the discovery of Ultra-massive black holes and Super-massive black holes, humans have yet to find out the cause of their formation with modern technology. Based on the analysis, we will look at the detection methods and calculation methods for black holes and their mass. Besides, we will also dive deeper into the actual formation of these Ultra-massive black holes. Taking a closer look at black holes’ sizes, there are many black holes between 0.1Ms and up to its maximum 150Ms, but something interesting is that after 150 Ms, we can barely find any black holes bigger than that until we reach black holes with millions of times the mass of our sun. This is quite fascinating, as if the knowledge we have now suggests that bigger black holes are formed through devouring and merging of other black holes. It is simply impossible for some of these black holes to even exist, as looking at the amount of time the universe existed, that is impossible for black holes of this mass to even form. In this paper, the detection method for black holes and black holes’ mass and the formation model of ultra-massive black holes will be discussed, which involves concepts like Quasi Stars and Quasi Black holes. These results shed light for us to discover the formation of ultra-massive black holes.
Research on Silicon Wafer Manufacturing Process and Physical Properties Testing Using High-Purity Polysilicon
Authors: Hu Xiaoming
Published: December 2021

The shape of a bare wafer is round, so it is called a wafer or a silicon wafer. It is the basis for the production of silicon semiconductor integrated circuits. The silicon wafer is cut from a large piece of semiconductor material silicon ingot. The high-purity polysilicon (its purity is up to 99.999999999%) is into a large single crystal, given the correct orientation and an appropriate amount of N-type or P-type doping, a silicon ingot is obtained through five-step crystal growth. Wafers (wafers) are then made from silicon ingots by more than eight processes. This paper investigates the single crystal silicon growth and wafer preparation process technology, and finally discusses the evolution of wafer size growth and changes in the development of the semiconductor industry chain.
Design of Infrastructure for Pumped Storage Power Station and Automatic Monitoring System Using Geographic Information System
Authors: Wang Yang , Wang Binbin , Zhu Tongyi
Published: December 2021

The pumped storage power station realizes grid connected power generation through the conversion between the potential energy of surface water and mechanical energy. It has become the strategic resource of UHV power grid with its low valley peak regulation and emergency standby function. The green basic design and design of the pumped storage power station needs systematic research. Based on the collaborative analysis method of production and ecological safety of storage disk, this paper takes Ninghai pumped storage power station as an example to carry out green infrastructure planning and design research. Through the comprehensive evaluation and analysis of construction land based on GIS, from the perspective of adaptability of power station construction to mountain creek pit environment, the function of horizontal layout is constructed in parallel and vertical layout, and a modular and distributed spatial structure of green infrastructure is constructed; Then, based on the continuous recycling of water resources, the monitoring and early warning system of power plant production ecological safety is constructed, which is “one water, two lines and three slopes”. It is hoped that the correlation between the production and the ecological dispatching of the storage tray can be found through the dynamic tracking of multiple factors and quantitative analysis of production cycle, which can provide reliable basis for timely mitigation of damage and formulation of compensation strategies, Scientific control of green infrastructure planning, design and construction.
Development of Low-Power Wide-Area Communication Gateway for Power Data Transmission
Authors: Sun Jian , Wu Hao , Huang Zhiyuan , Bei Binbin , Cao Songqian , Fan Chenghong
Published: December 2021

With the rapid development and maturity of communication technology, integrated computer technology and sensor technology, small sensors with sensing, computing and communication capabilities have begun to appear all over the world. The sensor network composed of these small sensors has received a lot of attention. This paper studies the low-power wide-area communication gateway for power data transmission. Based on the analysis of the energy consumption strategy of the power data transmission process, the low-power wide-area communication gateway for power data transmission is developed, and the developed gateway was tested. According to the peer test results of the gateway, the packet loss rate of the gateway within 100m is relatively good. Therefore, when arranging network nodes, try to control the transmission distance of the gateway within 100m. The energy consumption test shows that the energy consumption of the gateway is basically in an ideal state.
Design of an 8X8 Optical Matrix Protection Device based on Electric Power Communication Network
Authors: Fan Xinxin , Chen Xiuguo , Yan Hongmei , Wang Jianbing
Published: December 2021

In order to realize the fast establishment of power fiber circuitous channels, the reliability of power communication optical cable network is guaranteed. An optical matrix 8X8 protection device is designed by using all-optical switcher. The test results show that at the end of each input light path, any 8 paths can be switched, it can achieve 1:8 protection switch, realized the arbitrary switching of three modes and has the function of remote fiber route scheduling.
Preparation and the Mechanical and Tribological Properties of Laser Cladding Coating
Authors: Zhou Xin , Wang Yanjun , Liu Lei , Guo Xingju
Published: December 2021

laser cladding of snsbcu based alloy coating on GCr15 steel substrate was carried out by using lam-400s powder feeding metal printer. The hardness, friction coefficient and microstructure of the coating were tested by Vickers hardness tester, friction and wear tester, metallographic microscope and scanning electron microscope. The effects of laser cladding parameters on the dilution ratio, hardness and friction coefficient of the sample were studied; With the increase of laser power, the hardness of the coating is improved, and the hardness distribution is more uniform; The friction coefficient of the coated sample decreases greatly compared with that of the substrate.
Study on the Electrochemical Technology and Nanotechnology of Composite Electrode Used as An Alternative to Ultraviolet Light
Authors: Song Chunyan , Wang Xiaohui , Xie Xueying , Zhao Jingang , Zhang Nan , Gu Zhenqi
Published: December 2021

Advanced oxidation technology has the advantage of being able to efficiently degrade refractory organics, and plays an important role in the treatment of industrial organic wastewater. The article analyses its role in the purification of organic wastewater by the electrochemical method of polymer composite nano-titanium dioxide. The oxygen evolution potential of the nano titanium dioxide electrode is up to 2.8V, showing excellent electrochemical performance. Didache, Si/BDD, Nb/BDD, It/BDD electrodes and surface-modified BDD electrodes can generate strong oxidizing hydroxyl radicals on the surface of the electrodes, which are organic to phenols, dyes, pesticides, and surfactants. The degradability of wastewater is strong. Nano-titanium dioxide electrodes can degrade a variety of organic matter, with a current efficiency of >90%, and can completely mineralize organic matter. Nano-titanium dioxide electrodes have good application prospects in organic wastewater treatment.
Research on Key Technologies for Improving the Electro catalytic Performance and Physical Properties of Lithium Batteries in Electric Vehicles
Authors: Fang Qingyuan
Published: December 2021

Aiming at the uneven heat generation in various parts of the electric vehicle lithium battery pack during the discharge process, the heat generation mechanism is studied, and the lithium battery catalytic performance model is established to obtain the current density and heat generation rate distribution law of the lithium battery cell on the cell. The thermal model can simulate the thermal behavior of the battery under application conditions. Study the laws of battery heat production, heat transfer, and heat dissipation, and calculate the temperature changes inside and on the battery and the temperature field information in real time to provide a basis for the design and optimization of the battery and battery pack thermal management system. The simulation results show that the established model can predict the heating distribution and temperature field of the internal layered structure of the lithium-ion battery, which is helpful for the subsequent analysis of key influencing factors.
Study on the Physical Properties of Split-type Iron Base Shape Memory Alloy Pipe Joint
Authors: Tian Yun , Yao Qi , Jiang Dong , Xiao Yanni , Liu Licheng , Lin Chengxin
Published: December 2021

Aiming at the leakage phenomenon of pipeline system due to corrosion and other reasons, a split type iron-based shape memory alloy pipe joint based on the button bond connection was designed for repair. This split-type pipe joint can be used for quick in-situ maintenance of pipelines without cutting off pipelines or stopping transmission without pressure relief. It is especially suitable for intensive pipeline maintenance and online emergency maintenance. In order to study the connection performance of the split iron-based shape memory alloy pipe joint, this paper took the Fe17Mn4Si10Cr4Ni alloy pipe joint as the research object, and carried out pressure sealing and pull-out experiments respectively on the integral pipe joint and the split pipe joint which had not been carried out and had been subjected to one heat and mechanical training. The results showed that, compared with the integral pipe joint, the pressure seal value of the split pipe joint decreased by 40% to 20MPa and the pulling force decreased by 48.9% without heat-mechanical training. However, after 1 time of thermal-mechanical training, the pressure sealing value of the split-type pipe joint decreased by 12.5% to 32MPa and the pulling force decreased by 21.2% compared with the integral pipe joint. It can be seen that thermal-mechanical training can significantly improve the joint performance of split pipe joints, and the split pipe joint can meet the requirements of medium and low pressure pipeline connection and maintenance.
Physical Application of Mechanical Parts and Components Simulate in Receivable Auxiliary Multifunction Mechanical Hand and Claw
Authors: Yang Yuzhuo
Published: December 2021

Based on the analysis of current office work status and office robots, this paper proposes a design scheme of intelligent mechanical gripper which can transfer data and move objects independently to assist daily office work. It is proposed to design mechanical structure, including mechanism motion design and part structure design, and to use Autodesk Inventor to design and simulate mechanical parts and components. Dimensional and strength checks are carried out on key components, and stress analysis is simulated by using stress analysis module included in Autodesk Inventor. Finally, the mechanical structure design scheme and control system design scheme for the mechanical gripper are proposed. The overall design mainly centers on the functions expected to be completed, and innovates different organizations in combination to achieve the intended objective.
Design and Physical Detection of Bridge Tower and Externally Prestressing Cable for Existing Bridge Strengthened by A Cable-Stayed System
Authors: Wang Xianggang , Yang Yongcheng , Shen Yongli , Xin Xing , Jia Jian , Wang Yegang
Published: December 2021

With the continuous development of economy, the increasing traffic volume has brought greater burden to highway bridges. In this paper, a Yellow River Bridge is taken as an example. The cracking and deflection of the box girder of the main bridge have affected the structural performance requirements of the bridge operation. Based on this situation, the cable-stayed system is used to reinforce the bridge, and the construction process of bridge tower, cable saddle, steel anchor box and external beam is described in detail. The theoretical calculation and practice show that this method can effectively strengthen the bridge structure, and the cable-stayed system reinforcement method, as a mature, reasonable and operable construction technology, provides relevant reference for the reinforcement research of similar bridges.
The Mechanical Properties and Microstructure of Reticulated Red Clay-Sand Mixture Using X-Ray Diffraction
Authors: Zhang Yuxin , Li Jianzhong , Zhang Chuang
Published: December 2021

To assess the behavior of Reticulated Red Clay (RRC)-sand mixtures, a series of laboratory tests were performed on RRC-sand mixtures in which the weight ratio of sand ranging from 0% to 80%. Compaction test and direct shear test were conducted to evaluate the compactness of mixtures. The threshold sand content for the change of the mechanical properties of the mixture is 50%, and the mixture at this time has the densest structure. Oedometer test to the mixture indicate that the coefficient and compression modulus of it are only related to the ratio of its components. As the sand content in the mixture increases, the phenomena that the clay particles enclosing the sand particles and filling into the gaps of particles make the mixture denser. During the same time, there is a phenomenon of internal friction between sand particles caused by the inadequate wrapping of clay particles. Combined with the results of scanning electron microscopy and optical microscopy, the appearance of these phenomena and the transition process of the structure of the mixture from the clay structure to the sand structure were confirmed.
Physical Properties of Cyclic Esters and its Application in Heterogeneous Electrocatalysis
Authors: Duan Haonan , Niu Zanyao , Yang Xiaoqi
Published: December 2021

Oxygen reduction is a key reaction in many energy conversion devices. Phosphorus-containing porous organic polymers not only have developed pores and surface structure, but also have strong adjustable modification and modification, so they have a wide application prospect in heterogeneous catalysis. At present, the preparation of phosphorus-containing porous organic polymers and their applications in heterogeneous catalysis have not been reviewed. in this paper, the research progress in this field in the past decade is summarized and reviewed. The synthetic methods of phosphorus-containing porous organic polymers are developing rapidly, including coupling Polycondensation, lithium salt-mediated Polycondensation, Friedel-Crafts Polycondensation, solvothermal olefin polymerization, Scholl Polycondensation, phenolic polymerization, aldehyde-amine condensation, phosphorization of polypyran salts and multistage polymerization. At the same time of briefly describing the mechanism of oxygen reduction reaction, combined with the research results of my own team, this paper focuses on the application of new porous materials (metal-organic framework MOF, conjugated microporous polymer CMP, etc.) in electrocatalysis. In view of the problems existing in the current electrocatalysts, the future research ideas are pointed out, including the use of advanced technical means to characterize the active sites of the catalysts in situ, based on the fact that there are a large number of phosphine ligands in the framework, phosphorus-containing porous organic polymers can be loaded with a series of metal compounds to make supported metal nanoparticles catalysts, or even monoatomic or unit point metal catalysts. The optimal structure of the catalyst was inversely calculated from the high active sites, and the preparation conditions of the materials were optimized. Under the guidance of theory and practice, a new type of electrocatalyst with high efficiency, stability, economy and environmental protection was developed on the premise of in-depth understanding of the mechanism of oxygen reduction reaction. Then an example is given to introduce the use of POPs to solve the basic scientific problems related to biomimetic catalysis, and show its great application potential. Finally, the challenges and opportunities in this emerging field are summarized and put forward.
Microstructure and Physical Properties of Alloy Brazed with Filler by Mapping Scanning Analysis and Wettability Test
Authors: Li Xiupeng , Li Yunyue , Zhong Sujuan , Shen Yuanxun , Long Weimin , Pei Yinyin , Wang Luyi
Published: December 2021

In this paper, a new type of AlSiMgCuNiAg filler metal was developed. The solidus temperature of the filler metal is 509.1°C and the liquidus temperature is 531.3°C. The filler metal has a good wetting and spreading effect on the surface of 6061 aluminum alloy. The CuAl2 phase in the brazing seam was greatly aggregated after brazed, while the CuAl2 phase was reduced and Mg2Si strengthening phase was formed when the brazed joints with heat treatment. The average shear strength of the brazed joint without heat treatment was 47.1MPa, and the average shear strength of the brazed joint with heat treatment reached to 108.7Mpa. The strength of the brazed joint with heat treatment was increased by about 131% relative to the strength of the brazed joint without heat treatment.
A study on mechanical properties of ferritic alloy by physical testing for nuclear power fusion reactors
Authors: Jia Wenqing , Liu Xiangbing , Fan Minyu , Xu Chaoliang , Li Yuanfei , Qian Wangjie , Quan Qiwei , Yin Jian
Published: December 2021

The ferrite plays an important role in key component materials for nuclear power plant. The study was performed on ferritic alloys with various Cr content ranging from 10 to 38wt%. The Vickers-hardness and mechanical test results indicate that the high Cr content will cause a hardening and strengthening effect on the ferrite steel. Meanwhile, it can be concluded that the ferritic alloy suffers a reduction of toughness and a failure mode transition from ductile to brittle fracture with the increasing Cr content from the SEM fractography analysis.
Failure analysis for opening characteristic of high voltage and high-power silicon carbide module
Authors: Wu Peifei , Du Zechen , Yang Fei , Zhu Tao , Wu Hao , Du Yujie , Tian Lixin , An Yunlai , Sang Ling , Wu Junmin
Published: December 2021

According to the abnormal curve of opening characteristics in the process of double pulse test, the failure of 6.5kV/100A SiC module is judged, and it is preliminarily concluded that the gate of the module is damaged; The failure of the module is located by means of module anatomy, static characteristics test and chip screening test. It is concluded that the failure of the module is caused by the abnormality of two SiC MOSFET chips in the module; The damage of the chip was located by using stereomicroscope, OBIRCH, SEM and other equipment, and the root cause of MOSFET failure was studied by stripping anatomy. The preparation process of the gate and passivation strip on the MOSFET was poor, and the introduction of defects led to the breakdown of the gate unable to withstand high voltage.
A Channel Self-Alignment process for High-Voltage VDMOSFETs in 4H-SiC
Authors: Ge Huan , Zhu Tao , Chang Shucheng , Zhao Wanli , Bai Xue
Published: December 2021

In this paper, we describe a channel self-alignment process to produce High-Voltage VDMOSFETs in 4H-SiC. We use polysilicon as a mask for two injection methods, Because the oxidation rate of polysilicon is different from that of silicon carbide, we can generate a certain thickness of silicon oxide flank wall by controlling the oxidation rate and time. Therefore, there will be a certain distance between the N+ source region and the Pbase region, and this distance is the length of the channel. Obviously, no pattern transfer occurs between the two ion implantation processes, so the channel is self-aligned. As long as the thickness of the side wall is controlled accurately, the channel length of sub-micron can be obtained.
Study on Design of Novel Function/Structure Integration Mounting Plate for Space borne SAR Antenna for Wireless Communication
Authors: Jiang Shouli , Li Jia , Leng Tongtong , Xiao Rui , Yang Zihao , Zhong Jianfeng , Wang Richu
Published: December 2021

A novel lightweight and high-precision synthetic aperture radar (SAR) antenna mounting plate scheme based on functional structure integration technology is proposed. The thermal control function, high and low frequency blind insertion signal transmission function of the system are combined with the antenna structure to greatly reduce the size and weight of SAR antenna. The design verification of a high-density integrated SAR antenna mounting plate breaks through the key process technologies such as accurate splicing of multiple interfaces of the mounting plate, highly reliable cementation of non-uniform honeycomb and large-scale warpage control, and solves the key technical difficulties of high precision, high temperature and high reliability. The results show that the antenna mounting plate (size 649mm × 430mm) the overall flatness is better than 0.28mm, the thickness limit dimension deviation is less than 0.1mm, and the temperature consistency is less than 1.8°C. It can meet the requirements of lightweight, structural stiffness and strength, RF blind plug connection and heat dissipation for space borne SAR antenna.