bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Selective Laser Melting Technology Based on Titanium Alloy in Aerospace Products
Authors: Jing Li-li , Li yu-hua , Cheng Ke wei , Wang Feng , Shi Jin Wen
Published: March 2020

Selective laser melting (SLM) is a key technology for direct forming of metal parts in 3D printing technology. SLM technology can realize the direct forming of parts with complex shape, high dimensional accuracy and excellent mechanical properties. It is especially suitable for rapid manufacturing of personalized and customized structures of aerospace difficult-to-machine parts. SLM forming process involves complex physical and chemical behavior of materials. Forming mechanism is quite different from traditional casting processes. The process parameters are complex and difficult to control. In this paper, a set of SLM forming process parameters suitable for Ti6Al4V alloy has been explored through the development of a SLM forming equipment of ESO M290 in Germany. The innovation of this product application design is the SLM printing design and process of minimal size dual-antenna, and the process method and design idea are universal. SLM forming technology based on Ti6Al4V alloy will be more and more widely used in aerospace field.
Electric Field Simulation Analysis and Insulation Structure Optimization of Transformer Elevating Seat
Authors: Zhou Junfeng , Wang Shuo , Peng Chong , Wang Ning , Wang Kang , Zhu Tiantong
Published: March 2020

During long-term operation, impurities and moisture in insulation oil would be absorbed by supporting parts in the elevating seat, which would reduce its insulation strength and leaded to partial discharge. In order to analyse the changing effect of the introduction of supporting parts on long oil gap E-field and optimize the insulation structure, based on the 500kV transformer, FEM was used to calculate the distribution of electric field in elevating seat, the equalizing ball shape was designed and optimized, the influence of elevating seat diameter on the lead surface maximum E-field was analysed. The results showed that after structural optimization, the maximum E-field on lead surface near supporting parts decreased from 8.95kV/mm to 7.82kV/mm, and on the equalizing ball surface decreased from 6.20kV/mm to 5.34kV/mm, with a decrease of 12.63% and 13.87% respectively, which improved the safety and reliability of transformer operation.
Preparation and Study of Properties of Polyhydric Alcohols Biphosphate Ethanolamine Salt
Authors: Wei Jiang , Jinfeng Li , Ziyuan Li , Jie Chen , Xiaoyan Zhang
Published: March 2020

A new type of halogen-free flame retardant has been synthesized with raw materials of Di(trimethylolpropane) and phosphorus oxychloride, and the influence of the raw material ratio, reaction temperature and reaction time on the yield has been discussed. It has been shown in the results that the molar ratio of Di(trimethylolpropane) and phosphorus oxychloride is 1:4, the reaction temperature is 80°C, the reaction time is 4 hours, the intermediates have the highest yield. Furthermore, the flame-retardant effect and thermal stability of the target product on different fabrics have been investigated, and the structures of the intermediates and the target products were characterized by Fourier transform infrared spectrometer.
Reliability Assessment on Typical Connection Modes of High Reliability Demonstration Area
Authors: Kang Wei , Hu Po , Gao Shan , Zhao Yang , Wang Zijun
Published: March 2020

In the process of construction and modification of distribution, choosing connection modes is a key link of network construction and plays a pivotal role in distribution network. In this thesis, firstly, the distribution network frame and its present situation in demonstration area is analyzed, and the shortcomings in present network are designed; After using the features of advanced distribution network frame in international metropolis for reference, the experience is concluded and four kinds typical connection modes which suit for demonstration area are designed; The characteristics and the scope of application of every typical connection modes are analyzed, the modification scheme according to the present distribution network frame in demonstration area is illustrated. Finally, the examples are taken as cases to illustrate that these typical connection modes are of high power supply reliability. With the constant rise of the require of power supply reliability, the connection modes in demonstration area will be widely used and extended gradually.
Study on Structure Optimization Design for Outrigger of In-situ Slewing Device
Authors: Jiang Huifu , Zhang Guosheng , Zhang Jiaxing , Zhang Linbo
Published: March 2020

To solve the problem of insufficient turning radius for heavy-duty wreckers in narrow and congested road environment, this paper designed a new type of in-situ slewing device, and conducted a finite element simulation analysis on it. On this basis, by combining the optimization theory, this paper further optimized the structure of in-situ slewing device by using three different optimization design methods, including screening method, nonlinear second-order Lagrange method and quadratic integer sequence algorithm. The total weight loss of outrigger structure was 69.96 kilogram, the weight-loss ratio is equal to 7.34%. These results prove that the goal of structural optimization design has been achieved.
Damage Diagnosis of Top Tensioned Riser Based on Strain Response
Authors: Ni Lingying , Sun Yu , Liu Zhihui
Published: March 2020

Strain has a high sensitivity to structural damage and can be used for damage diagnosis of marine risers in engineering. Considering the structure and boundary conditions of the top tensioned riser, it can be simplified to the Euler-Bernoulli beam element, and the strain equation on the riser wall is derived. The element Root-Mean-Squared Strain(RMSS) difference is proposed as the damage index parameter of the riser. The finite element software ANSYS is used to simulate the element strain response of the 1000m length top tensioned riser in the South China Sea with different damage locations, damage degree and sea state parameters, and the RMSS difference curve is drawn. The results show that the RMSS difference has high sensitivity to the riser structure damage, and the damage position of the riser can be effectively identified in many different situations.
Analytical Solution of Eddy Current Field for Arbitrary Coil Placement outside Pipeline
Authors: Wang Xiang
Published: March 2020

In this paper, the eddy current field model of the pipeline excited by the coil placed arbitrarily outside the pipeline will be established by using the second-order magnetic vector position, and the coefficient expression of the coil placed arbitrarily outside the pipeline will be obtained through the addition theorem of Bessel function, thus obtaining the analytical solution of the eddy current field. Finally, the analytical solution proposed in this paper is verified by experiments.
Multi-source Geographic Information Data Fitting for Transmission Line Design
Authors: Ren Yu , Chai Linjie , Zhao Bingjun , Wang Lihuan , Ren Yaning , Wang Ning , Shen Xiangliang , Gao Fan
Published: March 2020

Geographic information data is the basis of power transmission line design. The topography and topography of the survey area and the distribution of trees, houses, roads, rivers and other features directly affect the route direction of the line. How to quickly and efficiently acquire large-scale and high-precision geographic information data has always been the focus of power transmission line design research. This paper presents a method of fitting aerial survey data, satellite images, geographic contour lines and other multi-source geographic information data. It can be used to determine and optimize the route plan in the feasibility study and preliminary design stage to improve the work efficiency.
Effect of Seawater Immersion on Power Frequency Over Voltage Calculation of AC Three-core Submarine Cable
Authors: Wang Weiyuan , Cheng Jinmin , Sun Yi , Liu Jinghui , Shi Dajun , Li Feike
Published: March 2020

AC three-core submarine cable is an important carrier to transmit offshore wind power. Limited by the laying conditions, the reactive power compensation is generally carried out at both ends of the submarine cable line. And the armour along the submarine cable is immersed by seawater until the metal sheath, which causes the sheath of the submarine cable line to be grounded everywhere. With the growth of submarine cable lines, power frequency overvoltage becomes more and more serious. In order to effectively limit power frequency overvoltage, it is necessary to study and compare the effect of different reactive power compensation schemes on overvoltage. This paper is based on the research of double loop AC three-core submarine cables. The submergence of seawater is simulated by dividing the submarine cable into sections and grounding the sheath and armour of each section of submarine cable through resistance. On the basis of this model, the changes of line power frequency overvoltage under the conditions of “55” compensation, “28” compensation and three terminal compensation are calculated and compared. Under the scheme of “28” compensation at both ends, the maximum power frequency overvoltage of the line is the lowest. The research results provide a theoretical reference for the reactive power compensation scheme of offshore wind power access system.
Study on Estimation Method for the Residual Capacity of Battery in Hybrid Devices Based on Grey Prediction
Authors: Feng Zhi-Jun , Si Guo-Lei , Yin Xiao-Qian , Shi Ping-Shan
Published: March 2020

In order to accurately estimate the residual capacity of battery in hybrid devices, the definitions of the residual capacity in variable current and its modified formula under the actual working condition are given. The data samples of the residual capacity are obtained from the input signals which come from the power curve of a parallel hybrid excavator being scaled down to the range of a single battery. Based on the analysis of several grey prediction algorithms on the samples, a fragmentation prediction scheme is proposed that the direct grey prediction model of the cumulative - average operator is adopted at the charge stage, and the grey prediction model of the variable weight buffer factor at the discharge stage. The result shows that the proposed method can fully and effectively improve the accuracy of prediction for the residual capacity of battery in hybrid devices.
Effect of Fresnel lens as cover in a passive solar water heater with some air gap between cover and absorber plate
Authors: Handoyo Ekadewi A , Bisono Indriati Njoto , Jonathan Peter , Valentio Dio
Published: March 2020

A passive solar heater can be used to heat air in a room or water for some household needs. Passive solar heater can reduce the energy consumption by converting solar radiation energy to be thermal energy. Basically, a simple passive solar heater consists of absorber plate, thermal insulation, working fluid, cover, and structure to hold everything. This paper will discuss about the effect of Fresnel lens used as the cover and the air gap between cover and absorber plate on a passive solar water heater. The results of the experiment are that the commercial Fresnel lens could not gave the highest water temperature nor efficiency for passive solar water heater. The highest efficiency with glass cover and five-cm air gap was 22.8%. The smaller the air gap, the higher the water temperature in a passive solar water heater. The highest water temperature with glass cover and five-cm air gap was 63.8°C. The result of this experiment gives new challenge for the next research: we do the experiment in a solar water heater where water is circulated in a pipe and design until manufacture the new Fresnel lens.
An Alternative Way to Locate Disturbance Source for Low Frequency Oscillation Considering Control Devices of Generator
Authors: Guo Siyuan , Zhang Shoushou , Zhao Yongsheng , Song Junying , Zuo Jian
Published: March 2020

Fast and accurate location of the power oscillation disturbance source is of great significance for the implementation of power system safety and stability control measures. This paper focuses on the applicability study of the oscillation energy flow. Aiming at the evaluation of the oscillation energy flow in disturbance source location of low frequency power oscillation, the effects of different methods are compared. After that, a fast Fourier transform (FFT)-based oscillation energy flow method considering control devices of generator is proposed. Taking a low frequency oscillation case caused by the abnormal governor system as an example, the effectiveness and accuracy of the proposed method is verified.
Study on the Selection of New Parallel Gap of 500kV Transmission Line at High Altitude
Authors: Hu Wen , Zhao Chun
Published: March 2020

The current relevant power industry standards regulate the structure and size parameters of transmission line parallel gap. But practical operation experience proves that protection failure often occurs with the 500kV parallel gap recommended in the standards. A new 500kV parallel gap suitable for general areas had been developed for the purpose of improving the efficiency of protection, reducing the damage to insulator string caused by lightning flashover, and reducing the line lightning strike outage rate. However, under the condition of high altitude, the dimension parameters of general areas cannot be directly used in the new 500kV parallel gap. This paper conducts some tests on parallel gap of different size parameters with different serial lengths at UHV engineering technology (Kunming) national engineering laboratory at an altitude of 2100 m, including, U50% lightning impulse test, volt-second characteristic test, visible corona and radio interference test. Protection effectiveness have been analyzed. The results prove that the recommended transverse extension lengths of parallel gap electrodes are 750/750mm and 800/800mm respectively, when the number of insulators is 33 and 37.
Study on System Operation Characteristics of UHVDC Under Hierarchical Connection Mode
Authors: Wang Weiyuan , Cheng Jinmin , Ren Ziyuan
Published: March 2020

In order to effectively solve the problem of voltage support in receiving end of the multi-infeed DC system, the UHVDC connected to AC network under hierarchical connection mode is proposed. In this paper, the simulation model of UHVDC considering interlayer coupling is set up by PSCAD/EMTDC electromagnetic transient simulation software. The difference of AC system strength between hierarchical connection mode and traditional connection mode is compared. The variation characteristics of the effective interlayer short circuit ratio of the hierarchical connection AC system under different coupling strengths are simulated. By studying the influence law of the interlayer impedance on the steady-state system operation characteristics and the system commutation failure characteristics after the fault, the interaction between the different AC systems of the inverter side is analysed. The results of this paper can provide theoretical support for the operation stability of UHVDC hierarchical connection mode transmission system.
Optimization Research of Power Supply and Distribution Monitoring System Based on PLC
Authors: Qian Xiangjun
Published: March 2020

With the continuous development of comprehensive and multi-functional power distribution system, the reliability of power distribution system has higher and higher requirements. Therefore, it is particularly important to strengthen the real-time monitoring of power supply and distribution system. We choose PLC controller as the control core, and build the building automation power supply and distribution platform by matching with frequency converter, sensor and other equipment. We mainly take the district distribution room as the basic research object, design and optimize the monitoring system with automatic detection function. In this paper, S7-300 PLC is used as the core controller. Through the control program design and WinCC monitoring interface, the field monitoring is realized, and the realization of graphics monitoring system is discussed.
Research on Network Database Laboratory Instrument Management Information System Based on Content Query
Authors: Yang Bo
Published: March 2020

With the requirement of further opening of laboratories, it is increasingly important to carry out open management of laboratories on the basis of traditional laboratory management. In this paper, Windows operating system is used as the operating platform, ASP technology and databases such as Microsoft Access 2013 and Microsoft SQL Serv-er 2000 are used as development tools. This paper mainly discusses how to build an object-oriented image database based on content query based on the existing database management system, proposes a hierarchical model of the system, and presents a data structure model of the image database. A laboratory instrument management information system with B / S mode based on content query network database is developed. In the specific teaching, the laboratory should be fully open in the experiment content, experiment equipment, experiment time and experiment management, so as to make the laboratory open management scientific and improve the utilization rate of instruments and equipment.
Research on Computer Network Security Vulnerabilities and Preventive Measures Based on Multi-Platform
Authors: Xing Wenchao
Published: March 2020

The protection of computer network security vulnerabilities has always been the focus of people’s attention. It is necessary to analyze the causes of network security vulnerabilities in order to effectively protect and control them. In the operation of computer networks, there are some hidden risks, such as viruses, Trojan horses and hackers. For the information storage and transmission security has formed a huge threat, we need to do a good job in computer network security vulnerability analysis and prevention. Therefore, it is very important to strengthen the research of computer network security loopholes and preventive measures. This paper analyzes and discusses the types of computer network security vulnerabilities, the causes of computer network security vulnerabilities and the prevention measures of computer network security vulnerabilities based on multiple platforms.
Application of Edge Computing in 5g Communications
Authors: Wang Tongyu
Published: March 2020

As the next generation of the wireless communication technology, the fifth generation communication (5G) would bring revolutionary changes to our life. In this paper, we firstly give an introduction of the typical scenarios of 5G’s applications. Then we review the basic concepts of new computing hypotheses including cloud computing, fog computing and in some extent even for edge computing. Combining with the demand of 5G’s application, we analyze the opportunities and challenges of these new computing hypotheses in 5G era.
Ux Design of a Mobile Food App for Pregnant Women Mixed-Methods Approach
Authors: Yang Wenjin
Published: March 2020

Background: As a special group, the nutritional status of pregnant women not only directly affects their own health, but also has a close relationship with the growth and development of the fetus. More and more young people in China choose takeout food as their daily diet, which involves nutrition and food safety issue [1]. App Design: Nutritionist builds standard meal plans which could meet most pregnant women’s daily needs; the app collects all the physical exam results and the advices from obstetrician; after the data collection, nutritionists could use the suggestion from algorithm to customize each pregnant woman’s daily or monthly meal plan; finally, the chief will cook the meals and deliver them to the customer. Conclusions: After testing the app with 120 pregnant women in a hospital located at Zhenjiang City, Jiangsu Province, we plan to promote it to several cities nearby. The research suggests that this app can connect obstetrician, pregnant women, nutritionists, and chiefs so that pregnant women can be proactive in nutrition intake and control the food resource. Pregnant women highly appreciated the evidence-based pregnancy information, nutritionist’s opinions and convenient food delivery.
Network Security in the Era of Big Data
Authors: Zhong Feiyu
Published: March 2020

The convergence of three networks and the increasing progress of storage technique have ushered in the era of big data. As big data has key economic and political values, network security under the background of big data has become the focus of attention. Improving these network information security issues requires the joint efforts of the state, enterprises and individuals. The state needs to improve the definition of sensitive information, regulate the behavior of enterprises and individuals, and each user raises the awareness of network security prevention. It is believed that with the progress of technologies such as data encryption and data storage, network security issues will be better resolved.
Research on Power Network Regulation Mechanism Based on Knowledge Mapping
Authors: Dou Jianzhong , Wang Yang , Cheng Di , Sun Tao , Wu Yifei , Jin Yong
Published: March 2020

Knowledge map plays an increasingly important role in industrial processes, but traditional knowledge map representation mechanism can not completely represent the elements required in grid regulation and multi-level coordination for the entity map with entity-relationship as the core or the event graph with the extended time and space concept. Therefore, based on the current representation mechanism, a new knowledge map representation mechanism is intended to be designed in this paper where a knowledge flow representation language for grid regulation will be designed according to the work flow representation language. In the paper, core elements of multi-level regulation in power grid are first analyzed, and then representation language and its query expansion mechanism is designed to realize the power grid regulation mechanism based on knowledge map.
Effect of Inertial on the Adiabatic Shear Instability: Numerical Analysis
Authors: Liu Jiejian , Wang Genwei
Published: March 2020

Adiabatic shear instability, as a common plastic instability model of metal materials, has attracted more and more attention. In the process of metal cutting, adiabatic shear instability is observed in the chip with different cutting speed. The plastic instability of the chip usually has two effects: one is the quality of the machined parts, and the other is the fatigue service life of the machined tool. These two factors are usually determined by the parameters of the tool (front corner, back corner), the processing parameters (cutting thickness and cutting speed) and other conditions. In order to improve the machining efficiency, the main way is to raise the cutting speed under the condition that the tool parameters are fixed. With the continuous increase of cutting speed, the inertial effect will become stronger and stronger. By means of commercial finite element software Abaqus/Explicit, this paper analyzes the variation of metal cutting morphology, the fluctuation law of cutting force, the change trend of average cutting force, and the role of inertia effect in different machining speed ranges.
Application and Development of Virtual Reality Technology in Artificial Intelligence Deep Learning
Authors: Lin Qi
Published: March 2020

Virtual reality technology is a key technology that can support multiple dimensional spaces. Virtual reality technology is often supported by computer graphics, digital image processing, multimedia technology, and sensor technology. Virtual reality technology is often not a single technology or discipline. With the rise of deep learning theory, virtual reality technology has also been vigorously developed with the help of computer graphics and other related theories. Virtual reality technology has been widely used in the commercial field, and products such as virtual VR glasses have become more and more popular. This article will give a more comprehensive introduction to the development of virtual reality technology, and this paper will introduce the relevant theory of deep learning to further introduce virtual reality technology.
The Comparison and Analysis of Classic Convolutional Neural Network in the Field of Computer Vision
Authors: He Hanyue
Published: March 2020

Convolutional neural network algorithm has been proposed as early as 20 years ago, but due to limited numerical computing ability and insufficient learning samples, it stays in the research stage, and is not popular in the application-end. In recent years, with the emergence of large-scale tagged data sets, the support of computer hardware and the improvement of related algorithms, convolutional neural networks have begun to be widely used in the field of pattern recognition and image processing. By analysing the development of CNN (Convolutional Neural Network) and two major models: VGGNet and ResNet, this paper demonstrates the importance of depth, width and residual learning in convolutional neural networks, and summarizes the trends of CNN structure and the basic paradigm of neural networks.
Saliency Detection based on spectra Destiny Peaks Clustering
Authors: Xia Ruochen , Wang Guangwei , Cheng Xiang
Published: March 2020

Saliency detection mapping the whole salient object by simulating the human visual system is one of the fundamental problems in computer vision. In this paper we proposed a novel method to map the spatial vector features of image points to spectra, and decompose an image into large scale perceptually homogeneous elements for efficient salient region detection, using spectra destiny peaks clustering. a multi-layer saliency mapping is built based the size of regions, The final saliency map is intergraded in a hierarchical model. This method can overcome the common problem in saliency detection that the detection accuracy could be adversely affected if salient foreground or background in an image containing small-scale high-contrast regions. The experimental results show that the proposed method outperforms are improved greatly.
Design for Communication Network of Internet in On-line Monitoring System for Power Transmission and Transformation Equipment
Authors: She Jin Tao
Published: March 2020

The Internet of things (iot) for power transmission and transformation equipment is a systematic process that extends from smart grid to intelligent grid, which can guarantee the safe operation of power grid. However, due to various types of power transmission and transformation equipment and complex information composition, the Internet of things will be a network with high relevance and promiscuity in the physical and information space. The Internet of things of power transmission and transformation equipment is based on information model and communication network. It is necessary to deeply discuss the Internet of things of power transmission and transformation equipment based on intelligent detection and life cycle management. In this paper, IEC61850, an advanced Internet of things technology, is used for online monitoring system of power transmission and transformation equipment, and hierarchical structure is used for equipment transportation state. This system has good reliability and flexible extensibility, and can realize the free distribution of functions and the knowledge of system expansion. Moreover, it can use substation configuration description language.
Intelligent license plate recognition system based on digital image processing
Authors: Zhang Yulong
Published: March 2020

With the rapid development of China’s economy, intelligent transportation system has gradually become an inevitable trend in the development of modern traffic management. AS an important part of intelligent traffic system, license plate recognition system plays an important role in the management and control of modern traffic. This paper uses digital image processing technology to study the license plate positioning technology of color automobile images. Through image preprocessing, license plate positioning, character segmentation and character recognition, the image is processed to realize the recognition of license plate under different environments.
Hand tracking and fingertip detection based on Kinect*
Authors: Wang Xinyi , Ge Wenxiao , Li Jinhu
Published: March 2020

With the rapid development of computer technology and sensor performance, hand gesture recognition (HGR) has become one of the most promising research in human computer interaction field. Among all the procedures of HGR, real-time hand tracking is of great importance, which also faces many existing challenges. In this paper, an effective method was proposed for hand tracking in real time using Kinect, including the hand region extraction and fingertips determination. During the former procedure, we presents a novel two-scan method based on connectivity analysis and recrusion algorithm to extract the hand region in real time. After this, in order to determine the fingertips, we first implemented a fast hand convex hull extraction algorithm to obtain the primary candidate points. Then two typical constraints based on hand shape characteristics are applied to determine the final fingertip points. The subsequent experiments verified that our proposed strategy could significantly improve the quality of real-time hand tracking.
The Safety precautions and Design of Mail System
Authors: Fang Lei
Published: March 2020

Through the introduction of the current mainstream Mail protocol, this paper analyzes its advantages, disadvantages and application environment. Combined with the security strategies and application requirements, we summarize its practical application in production environment and further elaborate the hierarchical security management requirements of today’s mail system.
Personalized information recommendation simulation system based on compound recommendation algorithm——A research tool to study the push effect of algorithm
Authors: Yuqiao Yan , Weiping Zhang , Fangdan Luo , Hongli Zhang
Published: March 2020

The benefits and effects of algorithmic push are affecting all walks of life. It has also aroused the interest of media research and the discussion on the technical and moral issues involved in algorithmic push. In recent years, the discussion about “information cocoons” has become more and more intense. How to make effective quantitative calculation for algorithm recommendation is the key to empirical research on this problem. Therefore, this study designed a tool to effectively operate this variable around this problem. Based on the analysis of the main recommendation mechanism of algorithmic information distribution, this paper points out a method of how to measure the accuracy of algorithm recommendation in practical research, and designs a simulation personalized information recommendation system based on composite recommendation algorithm combining two mainstream recommendation mechanisms, collaborative filtering and text analysis.
Application Research of Short-term Traffic Flow Forecast Based on Bat Algorithm Support Vector Machine
Authors: Wang Rongxia
Published: March 2020

Characteristics transition from certainty to randomness, and the prediction difficulty of traffic flow also increases.Short-term traffic flow prediction technology can help cities to induce intelligent traffic by a Urban road traffic is a dynamic and complex system. With the reduction of observation time range, traffic nalyzing and predicting traffic flow. Through the analysis of traffic flow data and the identification and processing of erroneous and missing data, the influence of noise on the prediction process is reduced. Intelligent Transportation System (ITS) is getting more and more attention. At the same time, people put forward higher requirements for vehicle type recognition, license plate recognition, traffic flow prediction and other technologies. Support vector machine (SVM) can find a compromise between model complexity and learning ability according to limited sample data, in order to obtain the best generalization ability. Based on bat algorithm (BA) support vector machine, this paper studies the basic algorithm of pattern recognition and regression analysis and its application in short-term traffic prediction of intelligent transportation system.
Reliability Research of Vacuum Circuit Breaker Based on Degradation
Authors: Mu Yan , Wang Yongxing , Zou Jiyan
Published: March 2020

As one of the terminal equipments of power system, circuit breaker plays the role of control, regulation and protection, and its reliability level has an important impact on the stability of power system. The key point of reliability research of circuit breaker is mechanical reliability. Aiming at the research of mechanical reliability of vacuum circuit breaker, in order to make full use of the process information of circuit breaker failure, this paper uses the method of reliability modeling based on degradation to do tens of thousands of degradation tests on six 12 KV permanent magnet vacuum circuit breakers, and uses the principal component analysis method to determine the degradation amount of overrun to establish the degradation process model. According to the over-range degradation data, Weibull distribution is used to establish the degradation distribution model, and the corresponding model parameters are calculated, and the reliability function and the reliability comparison curve are given.
Research on Optimization Strategy of Regional Haze Governance Based on Synergy Effect——A Case of Central Plains City Group
Authors: Peng Zili , Zhang Ganggang
Published: March 2020

As an atmospheric pollution, haze governance involves economic restructuring, energy change, environmental science, laws and regulations and other aspects, is an important measure to improve people’s livelihood and optimize the mode of economic development. Through the analysis of the causes of haze and based on the synergistic effect, taking the Central China urban agglomeration as an example, from the perspective of public management, this paper puts forward the optimization strategy of regional haze co-governance, by constructing government departments 、 different levels 、 inter-regional intergovernmental coordination mechanisms, mechanisms for communication between local government and enterprises, citizen and local government、 enterprise’s supervision mechanism, scientific research institutions and government、 enterprise’s decision-making staff and technical support mechanism, to form a multi-subject, multi-pronged, seamless haze governance structure, which will prevent and control the tragedy of public sharing, promote the governance of public goods such as the atmosphere, break the administrative limitations of the administrative region, crack the decline of the Central Plains, and the development collapse of central region. It is of great significance to avoid the ecological overload and atmospheric pollution of the Central Plains urban agglomeration and to build a beautiful Central Plains.
Design and Implementation of Embedded Network Intelligent Control System Based on Big Data Era
Authors: Tong Junhong
Published: March 2020

Embedded systems transform the Internet to the Internet of Things, and promote cloud computing and large data service applications. Big data is the complete data group of human data and physical data in the Internet of Things. This paper presents an embedded network intelligent control system based on ARM & Linux. The system uses the embedded Boa server as the network server of the embedded network intelligent control system. Firstly, the architecture of embedded network intelligent control system based on web server is given. Secondly, the software system is described. Finally, the detailed modification process of Linux kernel for embedded network enabling control of terminal hardware is given. The embedded network intelligent control system architecture based on TCP/IP protocol stack can simplify the system architecture to a certain extent and has higher practicability. The experimental results show that the system works stably when the network communication speed is 1 Gb/s and the communication frequency is 80 Hz/s.
Browning Treatment in Tissue Culture of ‘Miliang 1’ Delicious Kiwifruit
Authors: Wang Rui , Song Qingling , Kongd Lingling , Zhang Yong
Published: March 2020

Explant browning is a common problem in tissue culture and has become a limiting factor in the development of kiwifruit tissue culture. The effects of different sampling time and disinfection conditions on tissue culture browning of ‘Miliang 1’ delicious kiwifruit stem segments were studied in this study. Finally, the best months of harvest and the best disinfection conditions were screened out. The results showed that the browning rate of ‘Miliang 1’ taken in April was significantly lower than other time periods, and the browning rate gradually increased with time, reaching a maximum of 33.3% in September, significantly higher than other times. There was no significant difference in the browning rate among May, June, July and August. When the disinfection treatment was 75% alcohol 10s + 0.1% mercury liter for 2 min, the number of pollution was much higher than other treatments, the disinfection treatment time was obviously insufficient. Whatmore, the longer the disinfection time, the less the number of pollution, but the more the number of browning was increased. When the disinfection treatment was 75% alcohol 30s+0.1% mercury 5min, the number of browning was significantly higher than other treatments. With the increase of alcohol and mercury treatment time, the number of explant contamination decreased, but the number of death increased significantly. Generally speaking, the final survival rate of callus induction in the treatment of 75% alcohol 20s + 0.1% mercury for 5min was significantly higher than other treatments, which was more suitable for the callus induction culture and disinfection of ‘Miliang 1’ kiwifruit.
Callus-induced explants selection of ‘Pyrus betulifolia’
Authors: Gao Yufei , Chai Jiufeng , Dong Ying , Kong Lingling , Zhang Yong
Published: March 2020

Efficient and stable in vitro regeneration system is the basic condition and key factor for the genetic transformation of pear. In order to find the most suitable explants to induce callus, three different explants, including seeds, hypocotyls and young leaves, were selected to induce callus respectively, and the regeneration ability of the three explants was compared, and finally the best material was selected. The results showed that loose and plump callus could be induced by using hypocotyl as explant in a short time.
Measurement and Control Event Planning for Formation Satellites
Authors: Pan Yanhui , Li Ming , Wu Dongxin , Gao Bo
Published: March 2020

Formation satellites have configuration requirement. It takes new problem to the automatic process of long term satellite management. Because formation satellites can be managed by inter satellite links for TT&C missions. The complex restricted conditions have been analyzed, including that the execution time and content of TT&C event are various, and time is short for TT&C and so on. A solution of TT&C mission planning is given for formation satellites with multiple constraints. Based on automatic process for multi-satellite management, the formation satellites can be managed automatically for long term. It is applied in the system forsatellite long termmanagement. The result shows that can avoid mistakes caused by manual operation, and improve management efficiency for formation satellites.
System Dynamics Simulation of CO2 Emissions from Typical Route Ships
Authors: Wang Zheng , Qin Cuihong , Liu Chunling , Zhang Wei
Published: March 2020

With the development of the shipping industry, the issue of CO2 emitted by ships has received increasing attention. It is urgent to carry out research on calculation and emission reduction of CO2 emissions from ships. Ship CO2 emissions involves multiple fuel consumption, the navigational condition, and other main and auxiliary engines aspects. Based on the analysis of ship CO2 emission calculation methods, this study describes the relationship between ship CO2 and ship speed, ship status, and main and auxiliary engines. On this basis, the ship’s CO2 emission system dynamic model was constructed, and the ship’s CO2 emissions are simulated according to the actual data. The results show that the proposed the ship CO2 emission system dynamics model can simulate single ship’s CO2 emission in real-time changes in the cumulative cases and total emissions, the main engine CO2 emissions account for this voyage ship total CO2 emissions 86.1%.
Stability analysis of a round cross-section rod from Shape Memory Alloys at reverse phase transition
Authors: Dumanskiy S A
Published: March 2020

The mechanisms that cause loss of stability of Shape Memory Alloy rods during the reverse phase transformation under a constant load for various methods of preparing the rods before starting the reverse phase transition were considered. The problem was solved for non-, singly- and twice- coupled statements and for the concepts of fixed and varied external loads taking into account the different resistance under tension and compression.
Study of the properties of a aqueous sodium silicate film on the surface of a refractory filler
Authors: Kidalov N A , Grigoreva N V , Gabelchenko N I , Belov A A , Savchenko A I
Published: March 2020

We investigated the effect of the method of solidification of aqueous sodium silicate on the formation of its film on the surface of a refractory filler. The structure of liquid-glass films on the surface of a refractory filler cured by convective drying, blowing with carbon dioxide, and with the addition of organic ether (butyl acetate) was studied. Quartz and chromite sands were used as a refractory filler.
Finite-element simulation of cyclic compression of a cylinder with account for energy dissipation
Authors: Korolev P V , Shilov M A , Fomin S V , Maslov L B
Published: March 2020

The article considers the solution of the associated thermoelastic problem of dynamic compression of a cylindrical sample from hyperelastic material in an axisymmetric formulation using the Abaqus Simulia finite element modeling software package. The authors present the results of a numerical experiment, carry out its analysis, make a conclusion if it is necessary to take into account energy dissipation in the study of materials operating under cyclic loading.
Design of the solar panel frame of the spacecraft by 3D printing with composite materials
Authors: Mirzaev M A , Smirnov I G , Dyshekov A I , Slavkina V E , Shereuzhev M A , Aliev S A
Published: March 2020

The optimal design of the skeleton panel of the solar panels of the spacecraft was designed taking into account the increased physical and mechanical characteristics through the use of composite materials and the method of topological shape optimization.
Mathematical simulation the kinetics of polymerization of vinyl ester resin using in pultrusion
Authors: Nasonov Y A , Safonov A A , Gusev S A , Akhatov I S
Published: March 2020

The polymerization kinetics of pultrusion resins differs from that of resins used in other composite production processes due to the presence of processing additives in the resin. The influence of such additives should be taken into account when modelling polymerization kinetics. This article proposes a simulation method that will allow researchers to reduce errors and to predict polymerization kinetics of pultrusion resins more accurately.
The quality improvement of polymer-surface treatment due to optimal toolpath and cutting parameters
Authors: Tatarnikov N N , Averin N V , Trubitsin M V
Published: March 2020

This article discusses the main directions of development in the sphere of polymer edge cutting machining. The authors proposed a special geometry of the cutting tool, as well as the technology for processing the case-shaped part, found on this study.
A method for reducing the fatigue crack growth rategrowth rate
Authors: Fedorov A A , Chernyatin A S , Matvienko Yu G , Razumovsky I A
Published: March 2020

On the basis of numerical modeling by the finite element method, a study was made of the influence of the field of local residual stresses, created by the action of a spherical indenter on the crack tip, on the fatigue crack growth rate. The problems of the fatigue growth of a flat semi-elliptic crack in a plate as well as a crack in a standard CT specimen are considered.
Determination of high-gradient components of residual stress by data of test hole drilling method
Authors: Karakozov Egor , Odintsev Igor , Plotnikov Alexander , Plugatar Taras
Published: March 2020

The article discusses a modified method for the determination of residual stress in a deformable solid. The general approach is based on a combination of test hole drilling method and speckle pattern interferometry as a tool for deformation response registration. A feature of the proposed procedure for processing experimental data is that it directly takes into account possible high stress gradients at the stage of theoretical model building. The applicability of this technique is illustrated by the example of the residual stresses components measuring at a welded pipe joint.
Development of invariant plasticity theory approach to construction of non-isothermal plastic flow models
Authors: Khudyakova A D , Temis Y M
Published: March 2020

Constitutive equations of invariant plasticity theory model with two structural parameters are presented. The method of determination of model applicability for non-isothermal cyclic loading simulation of constructional materials is described. Results of model testing on non-isothermal and non-proportional loading programs for nickel base alloy IN738LC and steel 45 specimens are presented in compare with experimental results from literature.
Methods of estimating local microdeformation in the sample with defect
Authors: Naumov O V , Pugachev M S , Moskvitin G V
Published: March 2020

Currently, much attention is paid to the choice of approaches in describing the limit States of load-bearing structures of complex technical systems with high requirements for their strength, resource, survivability and safety. Application of complex macro-approach is considered as a new scientific basis of complex diagnostics for predictive assessment of resource, survivability and risks of emergency and catastrophic situations. Characteristics of local true deformations and damages have possibility of the analysis of difficult local processes of transition to limiting stages of deformation. In this paper, methods for determining local microdeformations by applying diamond pyramid prints are proposed. The stress – strain state of bodies with a crack was evaluated on rectangular samples with a weld in the middle of the working part of the sample and simulation of a crack in the middle of the working part of the sample. The effect of microdeformations on the local hardness of the sample surface along and perpendicular to the loading line is investigated. The obtained results confirmed the possibility of estimating local deformations by the proposed methods.
Finishing lenses and ceramic products with loose abrasive using the cavitating effect
Authors: Asaev A S , Murog I A , Ivanaiskij A V
Published: March 2020

The analysis of the existing technological processes of manufacturing machine parts showed that there are problems in quality assurance and efficiency improvement during finishing. A possible way to solve this problem is to use the processes of manufacturing machine parts using the cavitation effect, information about which in the technical literature is limited. The studied method of finishing machine parts with loose abrasive makes it possible to increase productivity by creating unique hydrodynamic conditions.