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2011 CIE International Conference on Radar(RADAR 2011)

作者： LI Xin 1 ,HUANG Xiao-tao 1 ,FAN Chong-yi 1 ,LIU Wen-yan 1 ,PENG Shi-rui 2 1.College of Electronic Science and Engineering,National Univ.of Defense Technology,Changsha 410073,China 2.Department of Information Countermeasures,Air Force Radar Academy,Wuhan 430019,China

Bistatic through-wall imaging SAR has a promising future. A model of Bistatic SAR for through-wall sensing is established, whose transmitter working in side-looking strip mode with a stationary receiver. Aiming at the requirements of imaging algorithm development on system characteristics, the paper focuses on characteristics of Doppler, space dependence, and two dimensional (2-D) resolution distribution. Through theoretical derivation in time and frequency domain combined with simulation analysis, formulas of the characteristic indexes are obtained as well as the influence of system configuration and wall parameters on them. All these lay the theoretical foundation for the development of precise imaging algorithm.

关键词： Bistatic SAR 2-D Resolution system characteristics Through wall sensing Fixed-receiver

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characteristics and EOR mechanisms of nanofluids permeation flooding for tight oil

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Petroleum Exploration and Development 2020年第4期47卷 810-819页

作者： DING Bin XIONG Chunming GENG Xiangfei GUAN Baoshan PAN Jingjun XU Jianguo DONG Jingfeng ZHANG Chengming Key Laboratory of Oilfield Chemicals CNPCBeijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Xinjiang Oilfield Company PetroChinaKaramay 834000China Jilin Oilfield Company PetroChinaSongyuan 138000China

Tight oil reservoir development is faced with the key technical problem that"water cannot be injected and oil cannot be produced"*** the diphenyl ethers water-soluble(gemini)surfactants as water phase shell and C10–C14 straight-chain hydrocarbon compounds as oil phase kernel,a nanofluids permeation flooding system was prepared by microemulsion technology,and its characteristics and EOR mechanisms were evaluated through *** system has the following five characteristics:(1)"Small-size liquid":the average particle size of the system is less than 30 nm,which can greatly reduce the starting pressure gradient of water injection,and effectively enter and expand the sweep volume of micro-nano matrix;(2)"Small-size oil":the system can break the crude oil into"small-size oil"under the flow condition,which can greatly improve the percolation ability and displacement efficiency of the crude oil in the micro-nano matrix;(3)Dual-phase wetting:the system has contact angles with the water-wet and oil-wet interfaces of(46±1)°and(68±1)°respectively,and makes it possible for capillarity to work fully under complex wetting conditions of the reservoir;(4)High surface activity:the interfacial tension between the system and crude oil from a tight oil reservoir in Xinjiang is 10-3–10-2 mN/m,indicating the system can effectively improve the displacement efficiency of oil in fine pore throats;(5)Demulsification and viscosity reduction:the system has a demulsification and viscosity reduction rate of more than 80%to inversely emulsified crude oil from a tight oil reservoir in Xinjiang,so it can improve the mobility of crude oil in the reservoir and *** system can be used to increase oil production by fracturing in tight reservoirs,replenish formation energy by reducing injection pressure and increasing injection rate,and enhance oil recovery by displacement and cyclic injection,providing key technical support for effective production and efficient development and reco

关键词： tight oil nanofluid permeation flooding system characteristics EOR small-size liquid small-size oil dual-phase wetting

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Development of Computer Network of CNTIEC Management Information system

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Journal of systems Engineering and Electronics 1998年第4期9卷 58-64页

作者： Zhang Liming & Feng Qiujie(Institute of system Analysis of Beijing Polytechnic University, 100022, P. R. China)

LAN, WAN and MIS are developing quickly in China and foreign countries *** development of IF system has went through 3 stages with 7 development processes. The higstage of information integration highway has reached us and some other developed countries. Thecentral government, ministries and commissions in China have stated the engineering design on thissubject. China National Tobacco Import & Export Corporation (CNTIEC) brought a developmentproject forward. The general goals of this mission are: (a) to increaae the working efficiency ofCNTIEC by using modern information technology; (b) to incresdr the success rate in managementdecision making; (c) to heighten the management level to the high technology of information automation. The design should have a pod beginning and the whole design should be carried outin several steps. The management principle of information system is centsral management and distributed usage. CNTIEC's management can get a new stage by achieveng a scienific *** management personnel can exert their activity to the full by changing the way of the ***, it can realize personnel resource exploiting and concept transforming.

关键词： Four transformation & four combination Tactics and principle system objective system characteristics

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