水力

By a series field observation data, an empirical equation of mean velocity of viscous debris flow was got. The velocity calculated by the asymmetric coefficients, bottom slope and hydraulic radius of flow. It is good at both high resistance and low resistance area of debris flows. It is good consistent for the measuring velocity of otherwise field observation data of debris flow and viscous mudflow by this empirical equation.

由一系列野外观测资料得到的由泥石流不均匀系数、泥石流运动底部纵比降和水力半径计算的粘性泥石流运动平均速度经验公式，能适应各种类型的泥石流沟，与其它系列的观测资料对比有很好的一致性，与粘性泥流的观测资料对比也很接近。

This has provided hollond lucking of the mater power,enovgy remvce the use wind power munificent compensation.

这就给缺乏水力、能源的荷兰，提供了利用风力的优厚补偿。

This historic sister city, Petra the former capital of Nabataean Kingdom, is located only 150 miles away to the north across the border with Jordan.

该遗址上有111座巨大坟墓，其中94座都有纹饰，而且还有多处水井，它突现了纳巴泰文明的建筑成就和水力技术知识。

Hydraulic control valve is a main valve and the exterior of the needle valve and a combination of the pilot valve.

水力控制阀是由一只主阀及其外装之针形阀和先导阀等组合而成。

Nobbut one style in this second might change to another in the next second.

并基于此，提出应变集中为核心的水力劈裂观点。

Jobs in the green sector include hybrid car engineering, solar panel production and sales, wind farm design, hydroelectric and geothermal power management and pollution control jobs among the nongreen sectors.

这个行业可供选择的工作范畴很广，例如：混合动力汽车开发、太阳能电池板的生产和销售、风力农场设计、水力地热能源的利用以及一些非"绿色"行业的污染控制等。

The main results can beexpressed as follows:(1)Based on πtheory, some affected factors about wave forces are given, and therelation between affected factors and wave forces is analysised by experimentalresults.(2) The distribution of wave press at representative time and reflection nature aregiven and their variety charactes are discussed by experimental results.(3)By comparing the wave forces of quarter-circular breakwater and semi-circularbreakwater under the same wave conditions,some approximately wave forcesexpressions of quarter-circular breakwater are given.(4)Based on VOF method to trace water free surface,solve numerical value ofRANS equation,and get the distributions of flow field and wave press ofquarter-circular breakwater at the same time during one period,the mechanism ofwave force is also discussed elementarily.(5) Based on the result that RANS equation of numerical simulation agree wellwith experimental results,a new approach to study hydraulic natures of quarter-circular breakwater is provided.

其主要结论如下：一、通过π定理，确定影响波浪力的无因次参变量，根据试验结果对其影响因素进行分析；二、基于模型试验，给出典型时刻圆弧面防波堤的同步波压分布和反射特性，讨论它们的变化特点；三、通过相同条件下圆弧面防波堤与半圆型防波堤两种堤型试验波浪力的比较，给出了圆弧面防波堤波浪力的近似方法；四、利用VOF法追踪自由水面，数值求解RANS方程，得到圆弧堤堤体周围的流场和压力场，初步分析了速度涡流与压力场的相互影响；五、对比数值分析与试验结果，探讨数值方法研究圆弧面防波堤水力特性的可行性，提供新的研究途径

Valve plate and valve seat sealing surface for the oblique cone structure, oblique cone surface in the valve plate welding temperature, corrosion resistant alloy materials; fixed in the regulation of the spring between the ring plate and the Butterfly Valves plate with the adjusting screw assembly structure.

水力控制阀阀板与阀座的密封面为斜圆锥结构，在阀板斜圆锥表面堆焊耐温、耐蚀合金材料；固定在调节环压板之间的弹簧与压板上调节螺栓装配一起的结构。

It is important for safety and high efficiency of pumping station operation to study hydraulic stability of large scale pumping station.

大型泵站的水力稳定性研究对保证泵站的安全、高效运行具有重要意义，随着南水北调跨流域调水工程建设和全国大中型泵站改造的实施。

The optimal operating conditions were as follows: concentration of polyaluminum chloride was between 50 and 60 mg/L as Al, the concentration of sodium oleate was between 5 and 10 mg/L, the pH values of the wastewater was between 4 and 5, the hydrolic retention time was 1 hour and the recycle ratio was between 10 and 20%.

此外，在考量成本与水质下，以多元氯化铝浓度 50 ~ 60 mg/L as Al，pH 调整至 4 ~ 5，捕集剂浓度为 5 ~ 10 mg/L，水力停留时间为 1 小时，回流比为 10 ~ 20%为最适之操作条件范围。

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。