查询词典 waterhead

Based on the water resources survey of Shanghai in 1999 and the 1:50 000 color infrared aerial photos obtained in early 2000, a case study of the upper Huangpu River was carried out. The exponential method, pair-sample t test, and remote sensing analysis are used to analyze water environmental characteristics and land use pattern in the river network plain. In order to explore response of water quality in the waterhead region to the changes in land use and its driving force, five land use patterns are selected and a new type of exponential is designed.

以黄浦江上游水源地为例，利用1999年上海水资源普查数据及2000年初成像的上海市1：50000彩红外航空像片，采用GIS空间分析技术、灰色关联分析技术，划分土地利用样带，设计水质改善指数，探讨平原河网地区水环境质量对土地利用结构的响应，以及水源水质对土地利用变化驱动力的响应。

And the equations are solved coupling iteratively whith PCG method for Laplace equation and Gauss—Seidel method for convective equation.So the distribution of piezometric tube waterhead and saturation can be obtained.And the seepace free surface will be captured automatically according to the distribution of saturation with the concept of VOF.

分别对饱和区的拉普拉斯方程采用预处理共轭梯度法、非饱和区的对流方程采用Gauss—Seidel方法进行耦合迭代求解，得到渗流场的测压管水头分布和饱和度分布，并引入VOF的概念，由饱和度的分布自动扑捉渗流自由面。

The source of a river; headwaters; waterhead

你的那一套办法对他来说没用。

Results Meliorative group : 1 case （ 2.5%） died, and 2 cases （ 5.0%） occurred with obstructive waterhead.

结果改良组1例（2.5％）死亡，2例（5.0％）发生梗阻性脑积水；传统组5例（12.5％）死亡，6例（15.0％）发生梗阻性脑积水。

It has important effects for the stability of water conservancy building,the using of groundwater resource,the pollution controlling,the exploitation of rock oil and natural gas.And the needs of projects for those fields are increasing home and abroad.So the research of seepage flow becomes focuse.In this article,a saturated and unsaturated seepage model has been established which includes double variables:piezometric tube waterhead and saturation.

渗流现象是多孔介质中普遍客观存在的运动规律，其对水工建筑物稳定性、地下水资源利用、污染控制、石油天然气开采等工程问题均具有重要的影响，随着国内外在上述领域中工程需求的增加，渗流研究日益成为热点问题。

The saturation equals 1 in saturated region.The piezometric tube waterhead equals position head by neglecting the effect of capillarity in unsaturated region.So the nonlinear parabolic equation of seepage flow will degenerate to Laplace equation about piezometric tube waterhead in saturated region and convective equation about saturation in unsaturated region respectively.

将渗流域分为饱和区与非饱和区，为避免研究复杂的多相流问题，可以认为非饱和区是与大气相通的，则测压管水头中的压力与大气压相等，使测压管水头等于位置水头，从而渗流控制方程在两个区域中分别退化为关于测压管水头的拉普拉斯方程和关于饱和度的对流方程。

Based on the twice ?waterhead reconstruct of Zhangjiakou power plant ,this paper introduces the application and development? of SCADA in this area.

本文以张家口电厂的水源地两次远控改造为例，阐述SCADA在此领域的应用和发展状况。

The Hutuohe River wetland is the main waterhead of Shijiazhuang; however, the water was polluted more or less.

滹沱河岗黄段湿地是石家庄市重要的水源地，其水体遭受到了不同程度的污染。

Secondly it classifies the uses of regional water resources and waterhead project, then summarizes the methods to predict the demands of regional water resources and the methods to calculate water supply available.

2对区域的用水结构和水源工程进行了分类，总结分析了区域水资源需求预测的方法和可供水量的计算方法。

The reason caused the low ratio of reclamation and utilization of steam-condensed water which wastes our waterhead and resources is economy, especially the application of the techniques.

如何处理和利用这些具有经济价值的冷凝水，是一个多年的课题。1 冷凝水回收问题产生的原因首先，用汽设备排放大量的冷凝水是近于蒸

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。