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30 September 2019, Volume 29 Issue 3 Previous Issue    Next Issue
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Technology Theory and Application
Management Science Research
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Technology Theory and Application

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Research on Charging Machine of Electric Vehicle with V2G Function ZHANG Chun-jiang, HE Hao, LIU Ming, CHAI Xiu-hui, REN Bai-feng 2019, 29(3): 1-12.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.001 Abstract ( )   PDF (4273KB) ( )   With the development of electric vehicles,charging stations based on V2Gconcept have received great attention in recent years.In this paper,based on V2Grequirements,a charging machine with bidirectional power flow is studied.A topology scheme of PWM rectifier+ bidirectional DC/DC is proposed.The mathematical model of the main circuit is established,and the working mechanism is analyzed in detail.For two-stage charging,constant current discharging and charge-discharge translation,a control strategy based on DC-bus voltage as a control variable is proposed,and the parameters of PI regulator are designed in detail.The whole scheme of charging machine is simulated,and the hardware system of charging machine is realized by using digital signal processor(DSP).The simulation and experimental results show that the V2Gcharger has good performance,which realizes the bidirectional flow of energy and the unit power factor of the grid side. References | Related Articles | Metrics

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Study on the Construction of Cloud Platform of Intelligent Irrigation Area Based on Cloud Computing JIANG Jiu-chao, LI Ai-ning, LIU Wen-gui , LI Guo-shun, LIU Hai-bo, 2019, 29(3): 13-20.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.002 Abstract ( )   PDF (2140KB) ( )   In this paper,the basic component,the present situation of the application of the informatization status and the main problems at present of the irrigation areas are analyzed systematically.Through the application of the cloud computing technology in the information intelligent system of irrigation areas,the construction scheme of cloud platform in the irrigation area is put forward,some of the key technology in construction is given combined with actual application cases to provide a reference for the construction of intelligent irrigation area.At the same time,the construction of the platform also solves the problems existing in the collection and management of information points,data storage and analysis,and functional management in the irrigation area. References | Related Articles | Metrics

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Study on Automatic Ultra-sensitive C-reactive Protein Detector Based on STM32 Core and CS230 Color Converter ZHANG Tie-bi, SUN Shi-wei, ZHANG Rong-jie, SHI Yan 2019, 29(3): 21-25.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.003 Abstract ( )   PDF (816KB) ( )   A fully automatic detector based on ultra-sensitive C reactive protein(CRP)is studied in this paper,which uses STM32single chip processor as the core processor,TCS230as the color recognizer,and realizes the automatic feed of reagent bars and the analysis and storage of data.In this paper,the principle of coloration of reagent strip,working principle of system,hardware structure and software design are introduced,and the error and maximum variation coefficient of test data are analyzed.The experimental results show that the automatic detection of the system improves the efficiency,which is easy to operate with little error and worth popularizing. References | Related Articles | Metrics

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Experimental Study on Structural Characteristics and Interference Effects of Interface Transition Zone (ITZ) of the Cement-based Materials FAN Li-hui, ZHAO Qing-guo, ZHANG Jun-wei , FAN Xing 2019, 29(3): 26-33.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.004 Abstract ( )   PDF (2171KB) ( )   In this paper,the latest research results with regard to the Interface Transition Zone(ITZ) of cement concrete in twenty years are summarized and induced,the forming mechanism of the ITZ and its developing characteristics are furtherly expounded,and three properties of the micro-products in the early period of hydration are put forward which are a first priority bigger crystallogeny(PBC),crystal adhered to large interface(CAI)and itself crystallizing extrapolation(CE).In view of the ITZ micro-environment,two mechanisms of surface energy interference and bond energy control are put forward to improve the properties of cement matrix composites.The concept of hydrogen bond energy and anti-hydrogen bond energy is first proposed to describe the interference mechanism for water molecular.The inhibition of the CH and AFt growth of large crystals and its implantation properties weakens its growth and generates more C-S-H gelatinous in time and space.In the experimental study,the non-polar group factors are used to modify the aggregate surface property by means of the polar of Si-O to form low surface potential energy and interference effects to block or eliminate the formation of the ITZ micro-environment.The experiment of cement mortar shows that the compressive strength of the specimen after 28days increases 67%after the interference,the shear strength increases 11%,and the water absorption decreases about 75%.According to the results of the interference experiment,new cognition about cement-based materials are put forward for several questions and concepts. References | Related Articles | Metrics

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Numerical Analysis of Mechanical Performance for New and Old Concrete Interface Installed Three-Dimensional Steel Mesh Mat LI Bin, XIAO Cheng-zhi, SUN Wen-jun 2019, 29(3): 34-39.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.005 Abstract ( )   PDF (1716KB) ( )   Interface properties of new and old concrete is one of the important factors for concrete maintenance.Herein,a new type of conjunction mode reinforced by three-dimensional steel mesh mat has been put forward and used in practical concrete repairing project.Based on ABAQUS finite element software,numerical simulation of new-old concrete composite slab model of bridge strengthened with three-dimensional steel mesh mat is carried out to compare and analyze the connection property of the two different concrete interface bonding models.The results show that after installing three-dimensional steel mesh mat between the new and old concrete interface,the integrity of the structure is significantly improved,the stress transfer performance becomes better and the displacement on the joint surface decreases obviously under the same load. References | Related Articles | Metrics

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Study on Horizontal Deformation of Tunnel Surrounding Rock under Soil and Rock Boundary Geological Conditions SUN Wen-jun, XUE Shao-qiang, LIU Bin, SONG Yang, LI Bin 2019, 29(3): 40-43.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.006 Abstract ( )   PDF (890KB) ( )   This paper compares and analyzes the horizontal deformation law of tunnel surrounding rock under different excavation directions and the influence of soil and rock interface inclination angle on the horizontal deformation of tunnel surrounding rock.The results show that the horizontal deformation laws of tunnel surrounding rock under different excavation directions are similar and the horizontal deformation of the surrounding rock at the working face decreases with the increase of the dip angle of the earth-rock interface,and the decreasing amplitude gradually increases.The results of the study will provide important references for tunnel excavation construction under the geological conditions of soil and rock boundary. References | Related Articles | Metrics

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Monitoring on Excavation of Large Foundation Pits in Coastal Soft Soil Foundation LUO Cai-song, SUN Xu-long, ZHANG Yun, SONG Hong-gang, ZHOU Lin-fang 2019, 29(3): 44-51.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.007 Abstract ( )   PDF (2802KB) ( )   The construction technology,monitoring program and monitoring data of a large-scale foundtion pit of a coastal city are analyzed in this paper.The results show that the deformation rules of the enclosure structure are closely related to the construction scheme and the surrounding environment.Monitoring pertinently on slope soil of foundtion pit and its supporting structure and surrounding is of great importance for the evaluation of the rationality of foundation pit design,construction safety and accident prediction.The construction can be guided and the economic loss can be avoided according to the monitoring and analyzing results. References | Related Articles | Metrics

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Innovative Design of Combined Multi-Functional Loading Power-assisted Mechanical Vehicle GONG Xiang, ZHANG Peng-cheng, GAO Yun-li, RU Jiang-yan, YAN Qiong 2019, 29(3): 52-56.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.008 Abstract ( )   PDF (867KB) ( )   In this paper,an innovative design method of combined multi-functional loading power-assisted mechanical vehicle is presented.The mechanical structure of the innovative product includes hydraulic lifting mechanism,360-degree free movement mechanism,rotating mechanism,carriage deployment mechanism,and power-assisted platform mechanism,etc.It can easily realize the loading and unloading of heavy goods in express delivery,logistics and other industries to provide assistance,adapt to different operating environments,meet multi-angle and multi-direction operation,and greatly reduce the workers’labor intensity. References | Related Articles | Metrics

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Behavior Analysis on Choices of Urban Residents on Shared Parking HAN Xue, WANG Di 2019, 29(3): 57-60.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.009 Abstract ( )   PDF (179KB) ( )   The emergence of shared parking provides new ideas to solve the problem of urban parking,and it has gradually become the research focus for domestic and foreign experts.In order to further study the choices of urban residents on shared parking spaces,aquantitative analysis of the influencing factors of the choices of parking spaces is made and a Logit model for discrete choices on shared parking spaces is built in this paper.The model test shows that parking rate,walking distance after parking,parking information,and convenience of parking lots have significant effect on parking decisions. References | Related Articles | Metrics

Management Science Research

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Optimization of Maintenance Strategy for Faulty Wind Turbine Generator in Wind Farm Management ZHANG Dong-mei, LIU Xin-tong 2019, 29(3): 61-65.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.010 Abstract ( )   PDF (300KB) ( )   High efficiency in wind farm management plays an important role for the healthy and independent development of wind power generation except for the continual innovations to decrease the cost.This research,which focuses on the tactical problem of faulty wind turbine generator maintenance in the management of wind farm and optimizes the scheduling scheme via mathematical model,is expected to decrease the loss of active power and to enhance the profit of wind farm by means of optimized management. References | Related Articles | Metrics

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Analysis on Socialized Service and Strategy of University Libraries WANG Yuan-chun, SUN Ying-hou, ZHENG Feng-ping, JIAO Yan 2019, 29(3): 66-69.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.011 Abstract ( )   PDF (357KB) ( )   The purpose of this paper is to discuss how to effectively carry out socialized service in university library under the background of constructing learning society.Beginning from the narrative development process and status quo of domestic and foreign university libraries＇socialized service,this paper interprets the research hotspot of domestic university libraries＇socialized service,and analyzes the role the university libraries should take in the socialized service.And according to the above analysis,respectively from the aspects of building society education center,providing enterprises with special service and providing government with think-tank services,the paper proposes the effective social service mode and the corresponding service safeguard mechanism. References | Related Articles | Metrics

Education and Teaching Research

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Analysis on Basic Features of Emerging Engineering Education under New Business Background 2019, 29(3): 70-74.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.012 Abstract ( )   PDF (186KB) ( )   References | Related Articles | Metrics

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Study on Cultivation of College Students' Innovative and Entrepreneurial Abilities Based on the High-quality Development of Regional Economic Society 2019, 29(3): 75-77.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.013 Abstract ( )   PDF (122KB) ( )   References | Related Articles | Metrics

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Construction of “Five-Educations” Platform Based on Improving the Development of Innovative and Entrepreneurial Education in College 2019, 29(3): 78-80.  DOI: 10.16046/j.cnki.issn2096-5680.2019.03.014 Abstract ( )   PDF (122KB) ( )   References | Related Articles | Metrics