水利

The thesis is based on income question, forest coverage rate and grop production.to beging with, date envelopment analysis is proved that it can be applicated into grain for green in shan-bei district, and then in view of the fact, seven esential factors which have influence on the project are found out: expense of dam, expense of crop,expense of cash tree ,expense of defense tree,other economic crop,expense of grass and graziery;and the output factors include:income of gdp,pure income per captia,the area of decreasing land loss,graziery income ,crop production,income of tree,the totle income of economic crop.after the date of each facts are puted into dea model,unefficiencial decision making units found.the data that are got through adjusting unefficiencial dmus dy dea can offer guide in shanbei district upgrading of an industrial structure.at the same time ,taking into account some possible problems in or after grain for green in shan-bei district,the thesis bring out some propesal to improve the circumstance,enhance the life level and putthe relation of population,resource and circumstance into a healthy orbit.

论文以解决陕北地区的收入问题，植被问题以及粮食产量问题为出发点，首先从理论上分析了包络分析方法在陕北地区退耕还林中运用的可行性，然后结合陕北地区目前的实际情况，综合分析出影响陕北地区退耕还林的关键的七个因素作为输入指标：水利水保设施投入，农作物投入，经济林种支出，防护林支出，其它经济作物，草类支出，畜牧业投入；以退耕还林所要解决的最终问题作为输出指标：GDP收入、农民人均纯收入、水土流失减少量、牧业总产值、粮食产量、林业总产值、其他经济作物总产值。将各指标所对应的数据代入模型后，通过分析求解得出非有效的决策单元，再运用包络分析方法的一些基本原理对非有效的决策单元进行调整，由此所得的数据对陕北地区的实际投入具有很好的指导意义。同时，又针对陕北地区在退耕还林过程中以及之后可能面临的困境，提出了一些建议和对策。最终使得陕北地区的投资环境尽快得以改善，使农民尽快脱贫致富，使人口、资源、环境的关系尽快纳入良性循环的轨道上。

The hydrologic telemetric equipment is an important component in automation research in the field of water conservancy.

水情数据测报一直是水利仪器自动化研究的一个重要课题。

Taking the structure of the gymnasium of Yellow River Hydrotechnical Vocational Institute as an example,this paper analyzes large-span arch-supported membrane structure using nonlinear finite element method and approaches to the characteristics of stressing and deformation of this kind of structure.

本文以黄河水利职业技术学院风雨球场拱支索膜屋盖为工程案例，采用非线性有限元法，对大跨空间拱支索膜结构体系进行了结构分析，探讨了拱-膜组合结构的受力和变形规律，检验了初步阶段膜找形结果的可靠性，为同类结构的工程设计提供经验积累。

Geology, teachers and undergraduates who involved in the teaching and studying inearth science

本书可供地理、地质、水利、气象、农业、交通和探险等方面的科技工作者，有关高等

Lakes and reservoirs are one of the most importamt water resouse,provide for people water conservancy and flood control, water using and water supply, energy supply, marine products, scenery appreciate, shipping improve, accept the row dirty water and weather regulate etc,and also can interferent the society and economy uneveluablely,they are indispensability priceless resource.

湖泊水库是人类最重要的淡水资源之一，为人们提供水利防洪、用水供水、供应能源、水产养殖、游览观赏、改善航运、接纳排污以及气候调节等多种功能，对社会和经济发展起到不可估量的作用，是人们生活不可缺少的宝贵资源。

Firstly, this paper studies the trend of the natural runoff of Huayuankou station, and then studies changing characteristic of runoff of Huayuankou station under the human activities. These human activities include runoff retention and use, growing industrial, agricultural and domestic water demands, water conservancy project and interlatitudinal water transfer project.

首先以花园口站为例，分析其天然径流的变化趋势，然后从黄河流域径流拦蓄及利用、工农业及城乡用水量的增加、水利水保工程措施运用及流域调引水等因素中，分析近年来人类活动的加强对花园口站径流规律特性的影响及变化规律。

It is reported that in china irrigative water use efficiency is only 0.4 ,and that water use efficiency of crops is 1 kg/m3; and is only half of developed country, thus it can be seen that the key of saving agricultural use water is to how to increase crops use water efficiency .

我国灌溉水利用系数仅为0.4，农作物水分利用效率仅为1kg／m~3，是发达国家的一半，由此可见发展节水农业的关键是提高农作物的水分利用效率。

Biotic amelioration mode, the irrigative water is high utilized by plants,in favor of the favorable circulation and perpetual build of the ecological environment system.

生物改良盐碱地，灌溉水利用率高，又利于生态环境的良性循环和永久性建设。

Mei Jianyun（Institute of Geophysics ; Academia Sinica）Fu Bingjun（Water Conservancy and Hydroelectric Research Institute）Kang Wenfa（Institute of Geophysics ; Academia Sinica

中国科学院地球物理所；水电部水利水电科学研究院

Snow region highland is standing tall and upright many 50 altitude the snow mountain of 7000 meters of above, berth of 1500 many big lakelet scatters meantime, contain is worn very substantial water resources.

雪域高原矗立着50多座海拔7000米以上的雪山，1500多个大小湖泊散落其间，蕴藏着十分丰富的水利资源。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。