检索结果-南通市图书馆

2-D NUMERICAL SIMULATION OF FLOODING EFFECTS CAUSED BY SOUTH-TO-north water TRANSFER PROJECT

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第5期20卷 662-667页

作者： SUN Dong-po XUE Hai WANG Peng-tao LU Rui-li LIAO Xiao- long north china University of water and Hydroelectric Power Zhengzhou 450011 China Institute of Civil and water conservancy Ningxia University Yinchuan 750021 China china Pearl River water Resources Planning Designing Surveying Co. Ltd. Guangzhou 510610 China

Since the General Channel designed for the South-to-north water Transfer Project in china has to cross many rivers and streams flowing from west to east, there are potentially serious effects additional flooding on the western side of the project alignment. Therefore, a 2-D numerical model for forecasting basin flood disasters was established and verified using historical flood data. The model was applied to researching the interaction between the proposed Project and flooding events for 5 streams in the Anyang River reach as a representative case study. Simulated results indicate that the model could correctly forecast the flood, submerged area and depths, and water surface elevations along the left side of the channel. The discharge capacity and location of hydraulic structures in the transfer canal alignment were analyzed. Then adjustments to the dimensions and positioning of proposed hydraulic structures were recommended at intersections, especially the addition of a channel to transfer flood water from one stream to another, which can effectively limit the sluice and protect the Anyang City from flooding.

关键词： South-to-north water Transfer Project 2-D numerical simulation interpenetrating flood field diffiuent canal

APPLICATION　OF　BODY－FITTED　CURVILINEAR　COORDINATE　TRANSFORMATION　IN　3－D　SEEPAGE　FLOW　COMPUTATION

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1994年第4期6卷 9-15页

作者： Fang Fang-xin Qi Li Chen Zhao-he Peng Yu (School of Postgraduates, north china Institute of water conservancy & {4., beijing 10004.,P. R. china)

In this paper, a three-dimensional seepage flow problem was solved by use of boundary-fitted curvilinear coordinates transformation technique. The application of the presented method in a practical project was briefly... 详细信息

关键词： hydropower project seepage flow three-dimensional computation bodyfitted curvilinear coordinate.

Combustion synthesis of radioactive waste immobilization

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2005年第2期24卷 119-124页

作者： ZHANGRuizhu GUOZhimeng LUXin JIAChengchang LINTao MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China／／NorthChinaInstituteofWaterConservancyandHydroelectricPowerZhengzhou450011China

Using chromium oxide (CrO3) as an oxidant, the immobilization of simulating radioactive waste in perovskite (CaTiO3) structure by a combustion synthesis (CS) method was tested. The products were characterized by Archimedes liquid displacement technique, microhardness technique, X-ray diffraction, and scanning electron microscopy. The leaching rate was measured by the method of MCC-1 or MCC-2. The primary results show that the CS method can be used to solidify the immobilizate waste effectively.

关键词： combustion synthesis radioactive waste Immobilization perovskite

在线全文

学校读者我要写书评

暂无评论

脉冲液体射流泵时均值基本性能的研究

水动力学研究与进展（A辑） 2002年第3期17卷 270-280页

作者：高传昌华北水利水电学院水利系河南郑州450045

本文运用流体力学、湍流射流理论和时均值计算法 ,导出了脉冲液体射流泵时均值基本方程及其动量修正系数方程组。通过与恒定液体射流泵基本方程进行对比 ,阐明了二者之间的关系。

关键词：脉冲液体射流泵时均值基本方程动量修正系数方程组

在线全文

学校读者我要写书评

暂无评论

加劲压力钢管结构分析解析法

水力发电学报 1998年第3期17卷 34-42页

作者：刘宪亮华北水利水电学院

本文以圆柱壳的轴对称弯曲理论为基础，建立了密间距加劲压力钢管整体结构分析的理论公式，并用有限单元法进行了验证。结果表明，本文的理论公式适用于任何间距的加劲钢管，为加劲压力钢管结构分析的通用公式；加劲环的刚度系数和等效... 详细信息

本文以圆柱壳的轴对称弯曲理论为基础，建立了密间距加劲压力钢管整体结构分析的理论公式，并用有限单元法进行了验证。结果表明，本文的理论公式适用于任何间距的加劲钢管，为加劲压力钢管结构分析的通用公式；加劲环的刚度系数和等效翼缘为其间距的函数，这些新结论是对现行压力钢管设计规范的补充和完善。

关键词：压力钢管加劲环结构分析解析法

Fuzzy Approach to Determining Priority Preorders of water Resources Projects

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2009年第2期15卷 121-125页

作者：刘英杰冯平 School of Civil Engineering Tianjin University Civil Engineering Supervisor Center North China Institute of Water Conservancy and Hydroelectric Power

In this paper,the criteria set related to the priority preorders of water resources projects is introduced.A fuzzy multiple criteria group decision-making model is established,which incorporates quantitative analysis,judgments,experience and preferences of *** model is used in practice to determine the priority preorders of five water resources projects,and the results show that the best choice can supply more new employment,domestic water and irrigation water,and has better quality.

关键词： fuzzy decision-making priority preorders water resources projects

在线全文

学校读者我要写书评

暂无评论

TBM的应用及其有关问题和展望

岩石力学与工程学报 1999年第3期18卷 363-367页

作者： Zhang Jingjian(north china Institute of water conservancy and Hydroelectric Prower, {4. 4.004.) 华北水利水电学院郑州450045

1 概述随着世界交通和供水的需要, 以及设计理论的完善和施工方法的进步, 国内外隧洞修建的数目和长度都不断增加. 国外已建成的长于10km的隧洞超过100条. 闻名世界的联接英国和法国的英吉利海峡隧道全长4..2km, 于1994.底投入运行.198... 详细信息

1 概述随着世界交通和供水的需要, 以及设计理论的完善和施工方法的进步, 国内外隧洞修建的数目和长度都不断增加. 国外已建成的长于10km的隧洞超过100条. 闻名世界的联接英国和法国的英吉利海峡隧道全长4..2km, 于1994.底投入运行.1988年日本本州到北海道的青涵海底隧道建成, 长53.9km.

关键词：隧道掘进机法施工 TBM

Finite Travelling Waves for a Semilinear Degenerate Reaction-Diffusion System

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2001年第4期17卷 603-612页

作者： Shu WANG Cheng Fu WANG Dang LUO Department of Mathematics, Henan University, Kaifeng 4.5001, P. R. china Institute of Mathematics, Academy of Mathematics and System Sciences Chinese Academy of Sciences, Beijing 100080, P. R. china Department of Mathematics, Suzhou University, Suzhou 215006, P. R. china Department of Basic Science, north china Institute of water conservancy and Hydroelectric Power, zhengzhou 4.004., P. R. china Department of Mathematics Henan University Kaifeng 475001 P. R. China Institute of Mathematics Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 P. R. China Department of Mathematics Suzhou University Suzhou 215006 P. R. China Department of Basic Science North China Institute of Water Conservancy and Hydroelectric Power Zhengzhou 450045 P. R. China

In this paper, the existence and nonexistence of finite travelling waves （FTWs） for a semilinear degenerate reaction-diffusion system (uiαit=uixx-multiply from j=1 to N ujmij, x∈R, t>0,i=1,. . . ,N （Ⅰ） is studied. where 0i0, i, j=1, . . . ,N .Necessary and sufficient conditions on existence and large time behaviours of FTWs of （Ⅰ） are obtained by using the matrix theory. Schauder’s fixed point theorem, and upper and lower solutious method.

关键词： Finite traveling waves Degenerate reaction-diffusion system Global solution Blow up

Deterioration Mechanisms of Sulfate Attack on Concrete under Alternate Action

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第2期25卷 355-359页

作者：高润东 State Key Laboratory of Hydroscience and Engineering Tsinghua University

By micro- and macro-observations, the deterioration mechanisms of concrete under alternate action between repeated sub-high temperature/cooling by water and sodium sulfate solution attack （TW-SA） were studied; meanwhile, the single sodium sulfate solution attack （SA） was also done as comparison. Micro-observations included the analysis of attack products by thermal analysis method and the determination of sulfate-ion content from surface to interior by chemical titrating method （modified barium sulfate gravimetric method）. Macro-observations mainly included the mechanical behaviors such as compressive strength, splitting strength. The experimental results indicate, in both cases, the main attack product is ettringite, only in the first layer of case SA some gypsum is checked; in case SA, the sulfate ions mainly concentrate in the surface layer, so the attack is relatively mild; but in case TW-SA, the repeated sub-high temperature/cooling by water promotes the sulfate ions diffusing inwards, which leads to obvious strength degradation.

关键词： concrete sulfate repeated sub-high temperature/cooling by water attack product sulfate-ion content strength