Scientific Research and Essays

  • Fuzzy comprehensive evaluation of fireworks destruction safety based on AHP method

    Fuzzy comprehensive evaluation of fireworks destruction safety based on AHP method Zhou Jun1, Zhang Yiping1, Ren Shaofeng1,2, Zhang Xiuyu2, Wan Sipeng1, Luo Yi1 1School of mining, guizhou university, guiyang 550025, China; 2Guizhou guian xinlian blasting engineering co., LTD., guiyang, guizhou 550004 Aiming at a large number of problems such as complexity, ambiguity and uncertainty existing in the destruction of fireworks, ahp-comprehensive evaluation method was applied to the safety evaluation of the destruction of fireworks. Taking A safe destruction operation in…

  • Experimental study on scouring of coarse sand and fine sand seabed caused by propeller washing in front of solid wharf

    Experimental study on scouring of coarse sand and fine sand seabed caused by propeller washing in front of solid wharf Shuo Zhang College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China This paper presents the results of continuous scouring and intermittent scouring tests on two kinds of seabed soils (d50=0.7mm coarse sand and d50=0.162mm fine sand) induced by propeller washing at the front of the solid wharf. Three propellers with diameters of 70 mm, 130 mm and…

  • Numerical simulation and analysis of coupled Thermal-Hydrological-Mechanical in coalbed methane heating mining

    Numerical simulation and analysis of coupled Thermal-Hydrological-Mechanical in coalbed methane heating mining Zhang Bo1, Xie Xionggang1,2 1Guizhou University, Guiyang 550025, China; 2Key Laboratory of Mineral Resources and High Efficiency in Karst Region, Guiyang 550025, China In order to verify the effect of heating on the effect of coal seam extraction,based on the theory of elasticity, seepage mechanics and heat transfer,a Thermal-Hydrological-Mechanical coupling model for gas extraction in high temperature field is established.The numerical simulation was carried out in the engineering…

  • Research Status of Purification Process of Eutrophicated Water

    Research Status of Purification Process of Eutrophicated Water Lingbing Wu , Anchao Geng, Ying Wang, Bo Wang, Xuan Li College of Ocean Science and Engineering, Shanghai Martime University,Shanghai 201306, China There are widespread eutrophication problems in lakes and rivers in China. Eutrophication means that the water body receives too much nutrients such as nitrogen and phosphorus, and the organic matter is excessive. When the algae dies, it rots, causing the water quality to deteriorate, thereby causing damage and destruction of…

  • Risk Perception and Evaluation of Supervision: A Study on Chinese Consumer Trust in Food Safety

    Risk Perception and Evaluation of Supervision: A Study on Chinese Consumer Trust in Food Safety Lei Zhang School of Journalism and Communication, Jinan University, Guangzhou 510632, China Food safety has always been the focus of attention from all walks of life as it has been treated as one of the important indicators of the development of a country, concerning national health, industrial security and social stability. On the basis of empirical data, this study analyzed consumer trust in food safety…

  • Research on Quality Behavior Coordination of Service Manufacturing Network Node Based on AHP and Fuzzy Mathematics

    Research on Quality Behavior Coordination of Service Manufacturing Network Node Based on AHP and Fuzzy Mathematics (This Article has been retracted from American Journal of Scientific Research and Essays. Do not use it for any purposes) Lei ZHANG Department of Industrial Engineering, Nanchang Hangkong University, 696 Fenghe South Avenue, Nanchang, China Service-oriented manufacturing network (SMN) is a network organization model under the background of industrial integration development. Based on the quality coordination characteristics of SMN nodes, the method of hierarchical…

  • Concrete Strength Variations of Unwashed and Processed Coarse Aggregate Sizes

    Concrete Strength Variations of Unwashed and Processed Coarse Aggregate Sizes Okoro, R.I, and Ezeagu, C.A Department Of Civil Engineering Nnamdi Azikiwe University This project aims to determine the effect of different coarse aggregate sizes and type on the compressive strength of concrete. The most important property of concrete is its compressive strength. The exceeding strength of concrete is as a result of the presence of coarse aggregate. Normal concrete is being produced from different types of aggregate and size and…

  • Simulation analysis of impact grounding resistance of transmission lines

    Simulation analysis of impact grounding resistance of transmission lines Yunsheng Xu and Chunyan Li Department of mechanical engineering, North China Electric Power University, Baoding 071000, Hebei In this paper, some methods of lightning protection measures are expounded in this paper, and then the influence of grounding resistance on ground resistance with current changing with current is revised by means of incomplete consideration of the influence factors of the impact grounding resistance in the standard. Keywords:Transmission line; Grounding resistance; Lightning protection

  • Research on the application of wheel pile foundation for transmission lines

    Research on the application of wheel pile foundation for transmission lines Yunsheng Xu1, Sheng Wang2 and Chunyan Li1 1Department of mechanical engineering, North China Electric Power University, Baoding 071000, Hebei; 2China Electric Power Construction Hebei electric survey and Design Research Institute Co., Ltd.,ShiJiazhuang 050000,Hebei Under the action of low pressure, the wheel pile foundation bears most or even all the downward pressure. When the wheel pile foundation is subjected to uplift force, the uplift force is supported by the short…

  • Implementation of IFOC Algorithm for a Three-Phase Induction Motor Embedded on DSP Microcontroller

    Implementation of IFOC Algorithm for a Three-Phase Induction Motor Embedded on DSP Microcontroller Denis Carlini Alexandre, Alexandre Simiao Caporali and Cesar da Costa IFSP Institute Federal of São Paulo, São Paulo, Brasil. Asynchronous machines are well known to have natural limitations because of the highly nonlinearity and complexity of their motor models. To resolve these problems, an indirect field-oriented control (IFOC) algorithm is applied to control the instantaneous electrical quantities such as torque and flux component. Medium-voltage drives are generally…