检索结果-南通市图书馆

Comprehensive benefit of flood resources utilization through dynamic successive fuzzy evaluation model: A case study

引用

中国科学：技术科学英文版 2010年第2期53卷 529-538页

作者： FENG Feng1,2, XU ShiGuo1, LIU JianWei1, LIU Dan1,3 & WU Bo4 1 institute of Water Environment, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, china 2 yellow river conservancy technical institute, kaifeng 475003, china 3 College of Water Resources, Shenyang Agricultural University, Shenyang 110161, china 4 Office of Flood Control and Draught Relief in Jilin Province, Changchun 130033, china institute of Water Environment School of Civil and Hydraulic Engineering Dalian University of Technology Dalian China yellow river conservancy technical institute Kaifeng China College of Water Resources Shenyang Agricultural University Shenyang China Office of Flood Control and Draught Relief in Jilin Province Changchun China

Taking the flood resources utilization in Baicheng, Jilin during 2002–2007 as the research background, and based on the entropy weight and multi-level & multi-objective fuzzy optimization theory, this research established a multi-level & semi-constructive index system and dynamic successive evaluation model for comprehensive benefit evaluation of regional flood resources utilization. With the year 2002 as the base year, the analyzing results showed that there existed a close positive correlation between flood utilization volume and its benefits, comprehensive evaluation value and its comparison increment. Within the six successive evaluation years, the comprehensive benefit of 2003 was the best, in which the benefit evaluation increment reached 82.8% whereas the year of 2004 was the worst, in which the increment was only 18.2%. Thus the sustainability and correctness of the evaluation were verified by six years successive evaluation and increment comparison. The analyzing results showed that the economic benefits, ecological benefits and social benefits of flood utilization were remarkable, and that the comprehensive benefit could be improved by increasing flood utilization capacity, which would promote the regional sustainable development as well. The established dynamic successive evaluation provides a stable theoretical basis and technical support for further flood utilization.

关键词： flood resources utilization comprehensive benefit dynamic successive fuzzy evaluation Baicheng City

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

生物柴油-柴油混合燃油的试验分析

引用

拖拉机与农用运输车 2011年第6期38卷 24-27页

作者：陈艳艳张俊海李荣黄河水利职业技术学院河南开封475003 北汽福田汽车股份有限公司北京102206

进行生物柴油及生物柴油-柴油混合燃油应用于压燃式发动机上的外特性和负荷特性试验,研究分析了生物柴油-柴油混合燃油以不同比例混合时所表现出的动力性、经济性和排放性的差异,为生物柴油-柴油混合燃油的优化控制提供基础。

关键词：生物柴油生物柴油-柴油外特性负荷特性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative Analysis on Two Accounting Systems of Rural Economic Originations

引用

Asian Agricultural Research 2011年第4期3卷 99-102,106页

作者： HU Yu-ling School of Finance and Economics,yellow river conservancy technical institute,kaifeng 475003,china School of Finance and Economics Yellow River Conservancy Technical Institute

In order to normalize the financial account of two kinds of economic organizations,the comparative analysis is conducted on the Accounting System of Village Collective Economic Organization and Accounting System of Farmers’ Cooperatives(Trial) issued by the Ministry of *** comparison points out that application and accounting principles of the two kinds of accounting systems are *** differences and similarities of the five accounting elements are analyzed including property,liabilities,rights of owners,costs and profits and losses,as well as the reasons of the differences and *** show that both of the two accounting systems reflect the principles of simplification and *** village collective accounting system works in rural village committee,which acts the administrative duties,the features of concerted benefits of it is *** the accounting system of farmers’ cooperatives is based on the village collective accounting system and combines the norms of accounting system of enterprises,so the system represents the demands of collaboration and profit-making.

关键词： Village collective economic organizations Farmers’

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Vocational Teaching Cube System of Engineering Graphics

引用

CADDM 2003年第Z1期 61-65页

作者： Yang Daofu 1 Liu Shenli2 1yellow river conservancy technical institute, kaifeng 475001, china 2Zhengzhou institute of Light Industry, Zhengzhou 450002, china

Based on long-time research on vocational teaching cube theory in graphics education and analyzing on the intellectual structure in the process of reading engineering drawing, the graphics intellectual three-dimensional model, which is made up of 100 cubes, is founded and tested in higher vocational graphics education. This system serves as a good guidance to the graphics teaching.

关键词： vocational education graphics intelligence 100 cubes theoretical model teaching system

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Channel Accretion on the Lower Reaches of the yellow river and E

引用

人民黄河 1985年第3期 7-16页

作者： Research institute, yellow river conservancy Commission Research institute yellow river conservancy Commission

Aggradation of channel on the lower reaches of the yellow river is mainly governed by the regimen of river discharge and sediment delivered from upstream. In the long run, channel accretion exhibits alternate increase and decrease, somewhat periodic in *** long-term average annual deposition is something like 300 million tons. Besides the aforesaid factor affecting scouring and depositing along the river channel along the lower reaches, there are also the following factors of influence: fluvial processes and changes in river bed in previous stages, operation of Sanmenxia Reservoir in regulating floodwater and sediment delivery, as well as conditions at the river mouth. After undergoing 3 consecutive periods of accretion-degradation-accretion, and being subjected to different measures to cope with the problem at different times, adapting to the actual condition, there is now only accretion to limited extent above Jiahetan and .below Aishan, most of the deposits being laid in the intermedite section. The distribution of the deposits in the crosswise direction is related to overflowing onto the floodplains, the duration, and the condition of levees there (to protect the farmland on the floodplains from ordinary floods). During the period from 1950 to 1983, a total of about 5 biIlion tons of sediment deposited on the floodplains on the lower reaches, comprising 70% of the entire volume of deposition, distributed unevenly though, mainly outside the area sheltered by the levees, effecting in an increase in transverse slope of the channel. In some sections, 'suspended river' was formed within the already 'suspended' river (river bed lying above the land surface behind the dykes).Sequence of years of observation in the fifties was chosen and the regulating effect of the Longyangxia, Liujiaxia and Sanmenxia and other reservoirs is also taken into account. In the 12 years from 1984 to 1995, average annual runoff on the lower reaches of the yellow river will be 38.8

关键词： reaches suspended river yellow somewhat affecting something reservoirs farmland runoff

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ON　CALCULATIONS　OF　THE　DRAG　COEFFICIENT　Cd　AND　THE　FALL　VELOCITY　ω　OF　SPHERICAL　BODIES

引用

Journal of Hydrodynamics 1994年第4期6卷 16-27页

作者： Xiang Zhao-fa (institute of Estuary and Coastland, yellow river conservancy Commission, Jinan, Shandong 250100,P. R. china)

A host of authors have proposed some theoretical and experimental formulas in hydromechanics concerning the calculation of the drag coefficient Cd of spherical bodies. But all of the existing Cd formulas hold true only at small Reynolds numbers and are restricted within certain flowing *** regards the fall velocity ω of spherical bodies, there is yet no formula applicable to each flowing range and to a direct expression and calculation of the fall velocity ω.In view of these, from N-S equations, and meanwhile based on measured data and complicated calculations, the author has developed and proposed the following results:(1) The drag coefficient (2) The dimensionless fall velocity where Es, Ω* and constants etc. are indicated in detail in this *** laborious calculation in lgRe2) convenient for general use, (3) preferable on the part of the precision and ***, to introduce this process and to illustrate the temperature effects on the fall velocity ω, some examples are discussed in this paper.

关键词： drag coefficient fall velocity spherical body numerical calculated formula.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SIZE DISTRIBUTIONS OF COARSE SAND BED LOAD IN TURBULENT FLOW FIELD

引用

Journal of Hydrodynamics 1995年第3期7卷 1-6页

作者： Zhang Hong-wu Wang Shan(institute of Hydraulic Research yellow river conservancy Commissivn,Zhengzhou 450003,P.R.china)

Putting forth effort on analyzing the action of turbulent flow on the sand particles on rvier bed surface,in this paper, the interdependent relation between the size distribution of coarse sand bed load and flow stren... 详细信息

关键词： coarse sand bed size distributions turbulent flow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficiency of sediment transport by flood and its control in the Lower yellow river

引用

Science china(Technological Sciences) 2004年第Z1期47卷 173-185页

作者： NI Jinren1, LIU Xiaoyong2, LI Tianhong1, ZHAO Ye’an3 & JIN Ling1 1. Department of Environmental Engineering, Peking University The Key Laboratory of Water and Sedi- ment Sciences, Ministry of Education, Beijing 100871, china 2. General institute of Water Resources and Hydropower Planning and Design, Ministry of Water Re- sources, Beijing 100011, china 3. The yellow river conservancy Commission, Zhengzhou 450003, china Department of Environmental Engineering Peking University Beijing China The Key Laboratory of Water and Sediment Sciences Ministry of Education Beijing China General institute of Water Resources and Hydropower Planning and Design Ministry of Water Resources Beijing China The yellow river conservancy Commission Zhengzhou China

This paper presents the characteristics of sediment transport by flood in the Lower yellow river with the reach from Huayuankou to Gaocun, which is regarded as a typical braided pattern. The Artificial Neural Network Model on Water Use for Sediment Transport (WUST) by flood was established based on the measured data from 1980 to 1998. Consequently, simulations of controlling process of sediment transport by flood were made in terms of the control theory under different scenarios. According to the situation of sediment transport by flood in the Lower yellow river, Open-Loop control system and feedback control system were adopted in system design. In the Open-Loop control system, numerical simulations were made to reveal the relationship between average discharge of flood and the WUST with varying sediment concentrations. The results demonstrate that sediment concentration has significant influence on the controlling process of flood flow to WUST. It is practical and efficient to control WUST if sediment concentration is less than 20 kg/m3. In the feedback control system, controlling processes of sediment concentration and flood discharge for sediment transport were simulated respectively under given conditions, and it was found that sediment transport process could be controlled completely by sediment concentration and discharge at the inlet of the reach from Huayuankou to Gaocun. Using the same method, controlling processes of sediment transport by flood in other reaches in the Lower yellow river were also simulated. For the case of sediment concentration being 20 kg/m3, the optimized controlling discharge ranges from 2390 to 2900 m3/s in the lower reach of Huayuankou. This study is also of significance to flood control and flushing sediment in the Lower yellow river with proper operation modes of Xiaolangdi Reservoir.

关键词： the Lower yellow river, flood, sediment transport, efficiency, simulation, control.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高校职业实用性体育教学内容的构建

引用

体育学刊 2008年第7期15卷 74-75页

作者：徐志刚黄河水利职业技术学院河南开封475001

高校体育是学校体育的最后一个阶段,而且学生求学的专业和未来的职业要求不同对高校体育教学提出了新的挑战。高校体育应加强职业实用性体育教学内容的探索与实践。根据各职业类型的要求尝试构建了有针对性的体育教学内容,强调职业实用... 详细信息

高校体育是学校体育的最后一个阶段,而且学生求学的专业和未来的职业要求不同对高校体育教学提出了新的挑战。高校体育应加强职业实用性体育教学内容的探索与实践。根据各职业类型的要求尝试构建了有针对性的体育教学内容,强调职业实用性体育应该突出实用性、合理性、终身性。

关键词：高校体育职业教育体育教学终身体育

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Soil erosion and sediment transport in the gullied Loess Plateau:Scale effects and their mechanisms

引用

Science china(Technological Sciences) 2009年第5期52卷 1283-1292页

作者： LI TieJian1,WANG GuangQian1,XUE Hai2,3 & WANG Kai4 1 State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,china 2 yellow river Engineering Consulting Co.,Ltd.,Zhengzhou 450003,china 3 North china institute of Water conservancy and Hydropower,Zhengzhou 450008,china 4 china institute of Water Resources and Hydropower Research,Beijing 100038,china State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing China yellow river Engineering Consulting Co. Ltd. Zhengzhou China North china institute of Water conservancy and Hydropower Zhengzhou China china institute of Water Resources and Hydropower Research Beijing China

Scale effects exist in the whole process of rainfall-3-runoff-3-soil erosion-3-sediment transport in river basins. The differences of hydrographs and sediment graphs in different positions in a river basin are treated as basic scale effects, which are more complex in the gullied Loess Plateau, a region notorious for high intensity soil erosion and hyper-concentrated sediment-laden flow. The up-scaling method of direct extrapolation that maintains dynamical mechanism effective in large scale application was chosen as the methodology of this paper. Firstly, scale effects of hydrographs and sediment graphs were analyzed by using field data, and key sub-processes and their mechanisms contributing to scale effects were clearly defined. Then, the Digital yellow river Model that integrates sub-models for the subprocesses was used with high resolution to simulate rainfall-3-runoff-3-soil erosion-3-sediment transport response in Chabagou watershed, and the distributed results representing scale effects were obtained. Finally, analysis on the simulation results was carried out. It was shown that gravitational erosion and hyper-concentrated flow contribute most to the spatial variation of hydrographs and sediment graphs in the spatial scale. Different spatial scale distributions and superposition of different sub-processes are the mechanisms of scale effects.

关键词： scale effect soil erosion hyper-concentrated sediment-laden flow the Loess Plateau

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：