下游

This paper analyze and study the influence of the superimposition in depth based on the previous achievements and combined with the theoretical qualitative analysis and project instances. The main contents as follow:Chapter 1: Indicate the significance and objective of this paper, review the previous achievements of the transient process and superimposition, and then present the study purpose of this paper.Chapter 2: combined with the physic knowledge of the fluctuation and the superimposition, Indicate the physical essences and the influence of the superimposition phenomena that exist in the diversion pipe system, and take one hydraulic turbine owning only one diversion tunnel and two hydraulic turbines sharing one tailrace conduit for instance to study out the numerical calculation superimpose operations.Chapter 3: From the calculation theory of the parameter of the guaranty calculation of regulation of the hydro-turbine, qualitative analyze the influence of the superimposition on them and the superpose time, combined with some project instances, get the numerical value of the influence of the superimposition and the superpose time.Chapter 4: Based on the previous achievements of the calculation and theoretical analysis of the surge-chamber ground swell, analyze the influence of the superimposition on it and the superpose time.

本文在前人研究成果的基础上，结合理论定性分析及工程实例，对波动叠加带来的影响进行深入分析研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水电站过渡过程及波动叠加方面的有关研究成果，在此基础上提出本文的研究内容；第2章，结合物理学中有关振动与波动叠加方面的有关知识，阐述水电站引水发电系统中存在的波动现象的实质及其影响，并以两机一洞和一机一洞具有上游调压室或下游调压室的水电站拟定其数值计算叠加工况；第3章，从机组调保参数的理论出发，定性的分析波动叠加对机组调保参数的不利影响及叠加时间，结合几个工程实例，得到波动叠加带来的影响大小及叠加时间；第4章，在前人对调压室涌浪进行计算和理论分析的基础上，分析波动叠加对调压室涌浪的影响及其叠加时间。

Mitochondria1 controlregion and cytochrome b gene of Bronze gudgeon in the lower reaches of the Yangtze River were cloned by PCR . Cloned fragments were digested by ten kinds of restriction endonucleases .

对长江下游铜鱼线粒体DNA 控制区和细胞色素b基因进行PCR扩增，扩增片段用10种限制性内切酶酶切。

The haplotype diversity index of of Bronze gudgeon in the lower reaches of the Yangtze River was 0.6071,which revealed a lower genetic diversity in mtDNA.

长江下游铜鱼线粒体DNA单倍型多样性指数为0.6071，线粒体DNA遗传多样性较低。

It is fou nd that in two dimensional case the wave-packet propagates downstream in the we dge-shape,the angle of the half wedge is 10° which is in good consistence with the experiment data.

发现点源波包在二维边界层中呈楔形向下游传播，其横向偏角为10°，与相关的试验图片相吻合。

Sure, you can't predict where the water will go a half-mile downstream, but for five seconds -- or five hours on Wall Street -- you can predict the unfolding show.

没错，你确实没办法预测水流在下游半英里的地方流向何方，但是，就在那五秒钟——或者，在华尔街那边，五个小时——的时间里，你却可以对这个正在展开的显现进行预测。

Hydrogen halide, which is a co-product of these downstream processes, can be recycled to the oxidative halogenation process.

这些下游工艺的共产物卤化氢，可循环回到所述氧化卤化反应方法之中。

The new canal head gate is located downstream of the old canal head gate about 80 meters.

新渠首闸位于老渠首闸下游约80米处。

Also the downstream equipment with a large chill roll with a diameter of 1200mm, high-life and cut-resistant surfaces on all film guiding rollers and the proven turret winder type 4000 for machine rolls guarantee constantly high production speeds.

也有一个有1200毫米，高寿命，降低大直径冷却辊下游设备，表面耐指导辊的所有电影和行之有效的炮塔络筒机类型机辊4000保证稳定的高生产速度。

Rome Tiber River is located in the hilly plains, over 2,500 years of history.

罗马位于台伯河下游的丘陵平原上，已有2500余年历史。

Rome Tiber River, is located in the hilly plains, more than 2,500 years.

罗马位于台伯河下游的丘陵平原上，已有2500余年历史。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。