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Combination of drainage, water supply and environmental protection as well as rational distribution of water resource in Zhengzhou mining district

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Science china Earth Sciences 2005年第10期48卷 1768-1779页

作者： WU Qiang1, LI Duo1,2, DI Zhiqiang3, MIAO Ying3, ZHAO Suqi4.& GUO Qiwen5 1. Resource Exploitation Engineering College, CUMT, beijing 100083, china 2. Shijiazhuang Engineering College, University of Economics, Shijiazhuang 050031, china 3. Shenyang Institute of Geology and mineral Resources, Shenyang 110032, china 4. state adminstration of coal mine safety, beijing 100013. china 5. Zhengzhou coal mine Company (Group), Zhengzhou 4.2371, china Resource Exploitation Engineering College CUMT Beijing China Shijiazhuang Engineering College University of Economics Shijiazhuang china Shenyang Institute of Geology and mineral Resources Shenyang china state adminstration of coal mine {4. beijing china Zhengzhou coal mine Company (Group) Zhengzhou china

The geological condition of coalfield is much complex in china. With increasing in mining depth and drainage amount, the contradiction of drainage, water supply and environ-mental protection is becoming more and more serious. However, the contradiction can be solved by the scientific management of optimizing combination of drainage, water supply and environ-mental protection. The Philip multiple objectives simplex method used in this article has searched for a possible solution at the first step, and then it goes on searching to find out whether there is a weight number that can lead the solution to the biggest. It can reduce the randomness and diffi-culty of traditional weight method which determine the weight number artificially. Some beneficial coefficients are vague and the number is larger in the model of water resource dispatch. So the vague layer analysis method can consider these vague factors fully, combining the qualitative and quantitative analysis together. Especially, this method can quantify the experiential judge-ment of policy decider, and it will turn to be more suitable if the structure of objective factors is complex or the necessary data are absent. In the paper, the two methods above are used to solve the plans of drainage, water supply and optimizing distribution of water resource in the Zhengzhou mining district.

关键词： combination of drainage, water supply and environmental protection, Philip multiple objective simplex method, vague layer analysis method, distribution of water resource.

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china's study on coal mining beneath surface buildings——state-of-the-art and developing trend

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中国有色金属学会会刊：英文版 2005年第S1期15卷 13-16页

作者： TENG Yong-hai~(1, 2), WANG Jin-zhuang~1 (1. china Institute of Mining Technology beijing Campus, beijing 100083, china 2. china coal Research Institute Tangshan Branch, Tangshan 063012, china) china Inst Mining Technol Beijing 100083 Peoples R China china coal Res Inst Tangshan Branch Tangshan 063012 Peoples R China

Extensive coal deposits are sterilized beneath surface buildings in china. The paper elaborates on the present status of the study on mining beneath surface buildings from several aspects involving the techniques for reducing ground subsidence and deformation and the measures for protecting buildings. Following that, it is pointed out that, in the future, more efforts should be directed forwards the following aspects: the laws governing the ground movement; the techniques for constructing anti-deformation buildings; coal-bed gasification and protection of buildings; grouting of the overlying strata with bed separation phenomena; and the method for evaluating the stability of the ground above a worked-out area.

关键词： mining beneath buildings state-of-the-art of study developing trend

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The state-of-Art and Development Trends of HSLA Steels in china

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Journal of Iron and Steel Research International 2011年第S1期18卷 1-13页

作者： WENG Yu-qing 1,YANG Cai-fu 2,SHANG Cheng-jia 3 (1.The Chinese Society for Metals,beijing,PR china 2.Centre Iron and Steel Research Institute,beijing,PR china 3.University of Science and Technology beijing,beijing,PR china) Chinese Soc Met Beijing Peoples R China Ctr Iron & Steel Res Inst Beijing Peoples R China Univ Sci & Technol beijing Beijing 100083 Peoples R China

During the last decade,the adjustment of product segments always is a very important task of iron industry,and upgrading of steel products has been impelled actively by Chinese iron and steel *** rapidly increasing of iron & steel production,a series of research achievements have been made in the technology area of high strengthtoughness steel,and also have been applied successfully in the actual production,*** technology of fine grain and ultra-fine grain steels,the technology for the control of microalloying ***,It is an important strategic goal of "Twelfth Five-year Plan" for Chinese iron and steel industry that the adjustment of steel product segments and meeting the requirements for upgrading of domestic and oversea equipment manufactory *** HSLA steel with better performance,instead of plain steel,could save steel consumption largely,and also release pressures from resource,energy and *** doubt,it is the only way to realize the sustained development of Chinese iron and steel industry by popularizing the application of HSLA steels vigorously.

关键词： HSLA steel microalloying technology Chinese iron and steel industry

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Serving High-Level Opening up with "TaxExpress"

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Belt and Road Initiative Tax Journal 2024年第1期 97-105页

作者： International Taxation Department, state Taxation Administration,the People's Republic of china International Taxation Department State Taxation Administrationthe People's Republic of China

Over the past decade,the Chinese tax authorities have been actively supporting the development of the Belt and Road Initiative,by creating a unique cross-border tax and fee service model with Chinese characteristics,which has laid a solid foundation for the establishment of the "TaxExpress" cross-border service *** October 2023,the state Taxation Administration of china(STA) officially launched the "TaxExpress" brand,focusing on one service matrix,two service teams,three service mechanisms,and four knowledge *** brand aims to enhance cooperation between ministries and commissions,promote international exchanges,and establish a framework for effective cross-border tax and fee *** forward,the STA will continue to leverage existing resources to support high-level opening up,by enhancing brand value,improving measures for international tax and fee services,expanding cross-border tax and fee services,strengthening professional talent teams,so as to develop a cross-border tax and fee service system that combines Chinese characteristics with international best practices.

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MSA安全互联平台及天鹰IO4.体检测仪整体方案

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中国个体防护装备 2024年第1期 11-12页

作者： Mesian (china) safety Equipment Co., Ltd 梅思安(中国)安全设备有限公司

为什么向智慧应急平台方向发展中国应急管理体系智慧平台是一个全面的应急管理系统，涵盖了监督管理、应急日常管理、应急救援、应急指挥等多个方面。在“十三五”期间，该平台已经建成了应急指挥“一张图”和国家应急资源管理平台，并...

为什么向智慧应急平台方向发展中国应急管理体系智慧平台是一个全面的应急管理系统，涵盖了监督管理、应急日常管理、应急救援、应急指挥等多个方面。在“十三五”期间，该平台已经建成了应急指挥“一张图”和国家应急资源管理平台，并在重特大灾害事故处置中发挥了重要的支撑保障作用。根据《“十四五”国家应急体系规划》，要进一步加快建设国家应急协同指挥平台和国家应急资源管理平台，进一步推进智慧消防救援、智慧矿山安全和智慧防震减灾建设。

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Optimization model and algorithm for mixed traffic of urban road network with flow interference

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Science china(Technological Sciences) 2008年第12期51卷 2213-2222页

作者： SI BingFeng,LONG JianCeng & GAO ZiYou state Key Laboratory of Rail Traffic Control and safety,beijing Jiaotong University,beijing 10004.,{4. state Key Laboratory of Rail Traffic Control and safety Beijing Jiaotong University Beijing 100044 China

In this paper,the problem of interferences between motors and non-motors in urban road mixed traffic network is considered and the corresponding link impedance function is presented based on travel *** the base of this,the main factors that influence travelers' traffic choices are all considered and a combined model including flow-split and assignment problem is *** a bilevel model with its algorithm for system optimization of urban road mixed traffic network is *** the application of the model and its algorithm is illus-trated with a numerical example.

关键词： mixed traffic impedance function user equilibrium optimization

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Optimization of gasoline hydrocarbon compositions for reducing exhaust emissions

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Journal of Environmental Sciences 2009年第9期21卷 1208-1213页

作者： SHEN Yitao,SHUAI Shijin,WANG Jianxin,XIAO Jianhua state Key Laboratory of Automotive safety and Energy,Tsinghua University,beijing 100084.china [a]state Key Laboratory of Automotive safety and Energy Tsinghua University Beijing 100084 China

Effects of hydrocarbon compositions on raw exhaust emissions and combustion processes were studied on an engine test bench. The optimization of gasoline hydrocarbon composition was discussed. As olefins content increased from 10.0% to 25.0% in volume, the combustion duration was shortened by about 2 degree crank angle （°CA）, and the engine-out THC emission was reduced by about 15%. On the other hand, as aromatics content changed from 35.0% to 4..0%, the engine-out NOx emissions increased by 4.. An increment in olefins content resulted in a slight increase in engine-out CO emission, while the aromatics content had little effect on engine-out total hydrocarbon （THC） and CO emissions. Over the new European driving cycle （NEDC）, the THC, NOx and CO emissions of fuel with 25.0% olefins and 35.0% aromatics were about 4.%, 21% and 19% lower than those of fuel with 10.0% olefins and 4..0% aromatics, respectively. The optimized gasoline compositions for new engines and new vehicles have low aromatics and high olefins contents.

关键词： optimization hydrocarbon composition exhaust emissions olefins aromatics

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Decoding algorithms for shortened-extended turbo product codes in WiMAX systems

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Science in china(Series F) 2009年第12期52卷 2415-2423页

作者： XU ChangLong1,3,4. YANG Wei1,2 & YE WeiChen4.1 state Key Laboratory of Networking and Switching Technology, beijing University of Posts and Telecommunications, beijing 10004., china 2 state Key Laboratory of Rail Traffic Control and safety, beijing Jiaotong University, beijing 10004., china 3 National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, china 4.Intel Corporation, beijing Kerry Center, Guanghua Road 1, beijing 100020, china state Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100044 China state Key Laboratory of Rail Traffic Control and safety Beijing Jiaotong University Beijing 100044 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China Intel Corporation Beijing Kerry Center Guanghua Road 1 Beijing 100020 China

The component codes of turbo product codes in WiMAX systems are extended Hamming codes and single parity check codes as well as their shortened forms, In this paper, three novel iterative decoding algorithms based on Chase, MAP algorithms and their combination are proposed for shortened-extended turbo product codes. The iterative decoding algorithm based on Chase algorithm is proposed to reduce the decoding complexity without any performance loss. An efficient MAP algorithm is then proposed to decode the component codes of shortened single parity check codes and shortened-extended Hamming codes. A comprehensive performance comparison of the proposed decoding schemes is conducted for three typical classes of turbo product codes in WiMAX OFDMA systems. The suitable decoding algorithms are recommended for different classes based on the simulation results.

关键词： block code product code iterative decoding

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Research and development on transonic compressor of high pressure ratio turbocharger for vehicle internal combustion engines

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Science china(Technological Sciences) 2010年第7期53卷 1817-1823页

作者： ZHENG XinQian, ZHANG YangJun & YANG MingYang state Key Laboratory of Automotive safety and Energy, Tsinghua University, beijing 100084. china 1. state Key Laboratory of Automotive safety and Energy Tsinghua University Beijing 100084 China

The pressure ratio required for a turbocharger centrifugal compressor increases with internal combustion engine power density. High pressure ratio causes a transonic flow field at the impeller inducer. Transonic flow narrows the stable flow range and de-teriorates stage efficiency. In this work, an advanced high pressure ratio transonic compressor was designed. The experimental results show that the maximum pressure ratio of this turbocharger is about 4.2, the maximum efficiency is above 80% and the stable flow range at the designed rotating speed is up to 34.. A turbocharger with this transonic compressor has been applied to some vehicle research actually, and improved power density by 4.%.

关键词： turbocharger internal combustion (IC) engine compressor high pressure ratio transonic

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Solving the constrained shortest path problem using random search strategy

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Science china(Technological Sciences) 2010年第12期53卷 3258-3263页

作者： LI KePing, GAO ZiYou , TANG Tao & YANG LiXing state Key Laboratory of Rail Traffic Control and safety, beijing Jiaotong University, beijing 10004., {4. 1. state Key Laboratory of Rail Traffic Control and safety Beijing Jiaotong University Beijing 100044 China

In this paper, we propose an improved walk search strategy to solve the constrained shortest path problem. The proposed search strategy is a local search algorithm which explores a network by walker navigating through the network. In order to analyze and evaluate the proposed search strategy, we present the results of three computational studies in which the proposed search algorithm is tested. Moreover, we compare the proposed algorithm with the ant colony algorithm and k shortest paths algorithm. The analysis and comparison results demonstrate that the proposed algorithm is an effective tool for solving the constrained shortest path problem. It can not only be used to solve the optimization problem on a larger network, but also is superior to the ant colony algorithm in terms of the solution time and optimal paths.

关键词： constrained shortest path deterministic random walk optimization

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