水力

Based on the science idea of coupling, this paper studied systematically the theory, mathematical model and technology of rock mass hydraulics in coal mining above aquifer, the numerical simulation method, the resemble simulation theory and method. A series of reciprocity law on the stress and displacement of upper and down floor of coal layer, coal pole, fault and the law of water pressure variety was analyzed thoroughly and particularly. Based on the relation of hydraulics character of multi-aquifer, the inspecting and predicting theory model, method and system of water outburst was founded. By used in the colliery, The results were ratified by colliery missionary. In situ test for the hydraulics character of the floor on hydrology observation hole was done.

本文基于固流耦合作用的学术思想，通过理论研究、相似模拟实验、数值分析及现场实际应用，系统研究了带压开采的块裂介质岩体水力学数学模型，数值模拟方法，相似模拟理论与方法，深入细致地分析了带压开采中项底板、煤柱、断层的应力位移分布、含水层水位变化等一系列相互作用规律，并建立了基于多含水层水力联系的底板突水监测预报理论模型及其监测预报方法与系统，并将研究成果应用于现场实际，得到了现场工作人员的一致认可。

The recommendatory formulas of the critical hoist flow velocity and pipeline resistance were presented for the engineering by comparing the previous studies.

通过比较已有的研究成果，本文总结了适于工程实际中使用的粗颗粒垂直管水力提升临界提升流速和管道输送阻力的计算公式。

On basis of recursion theory of deep optimization traversal, stimulated the logical graph of water project by visual programming technology, and applied it to the west water source project of Weihe valley.

运用图论中节点连接表法描述各水源之间的逻辑联系关系，探索了分析流域拓扑结构的基本思想；以深度优先遍历的递归理论为基础，采用可视化编程技术，用计算机模拟了与研究对象有水力联系的水源工程逻辑结构图，并以渭河流域西部水源工程为研究对象进行了实现。

The proportional reducing valve changes the electric signal into a hydraulic signal.

比例减少的阀门改变电信号到一个水力信号。

In order to resolve this problem,an effective conversion of fitted-body coordinate has been used in numerical simulations of flow field within a facture of layered medium ,resulting in a successful transformation of 2D flow-field calculation within a fracture from a complex physics domain to a regular calculation domain.

为了有效地攻克这一技术难关，在层状介质缝内流场数值模拟中，采用了有效的贴体坐标变换，成功地将二维缝内流场计算从复杂的物理域转换到规则的计算域，从而为我国全三维水力压裂数值模拟软件的开发和应用提供了良好的理论基础和新的思路。

By adopting surface molding to obtain solving region and then carrying out numerical calculation and analysis of flow field in centrifugal pump, accurate remodification information is obtained and optimized impellers which have excellent fluid dynamics capacity is schemed out.

采用曲面造型得到计算区域，通过对离心泵叶轮内部流场的数值计算与分析，为离心泵优化设计提供准确的修改意见，设计出水力性能优异的叶轮。

The nonlinear term of hydraulic gradient is 40% and 50%, and the critical Reynolds number is 22~27 and 52~104 for two kinds of media respectively.

两种石英砂出现非达西流时，其非线性项占水力梯度的40%~50%，相应的临界雷诺数分别为22~27和52~104。

Recent years, Laiwu City has organised and carried out the overall city riverway comprehensive treatment project, and built many water impounded works, which provided the guarantee for the exploitation of low water head resources.

近些年莱芜市组织实施了全市河道综合治理工程，建造了很多拦蓄水工程，为低水头水力资源开发提供了保障。

The reader is referred to Rosenthal's paper (1990) for a discussion on the calculation of hydraulic roughness.

关于对水力糙度计算的讨论请读者参阅 Rosenthal 的文章(1990)。

In particular, the present invention contemplates that a fabric is formed from a precursor web comprising a spunbond and/or cast scrim, which when subjected to hydroentanglement on an imaging surface (24), an enhanced product is achieved.

特别是，本发明期望织物从包含纺丝粘合和/或粗稀松纱的毛网形成，当在成像表面(24)上受到水力缠绕时，获得更好的产品。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。