压下

The tail tunnels with sloping ceiling is a new bodily form of pipeline for hydro-power stations. In the specific conditions, it can replace the surge tank of tailrace tunnel .It is applicable specially, if the water lever fluctuates greatly in lower reaches of a river and the length of tailrace tunnel system is between 150m and 600m.

变顶高尾水洞是一种新型的水电站管道体型，它在特定条件下能够取代尾水调压室，尤其适用于下游水位变幅大、尾水系统长度在150—600m之间的情况，从而节省较多的工程量，加快施工进度。

To all project practicality, the introduction is given to the operational characteristics, the methods for calculation and the researching actuality of the tail tunnels with sloping ceiling underground hydropower stations the Three Gorges. This paper has discussed in detail the characteristic method being the same with the compressive flow and the Priessmann solution being the same with the free-surface-pressure flow. And how to deal with boundary conditions has been expatiated. Also hydraulic transient process of tremendous load fluctuation in the tail tunnels with sloping ceiling has been numerical simulated and the Fortran program for numerical simulation has been given. The paper gain the maximal press for tail end of the shell, the maximal rising rate of rotational speed of generating set, the maximal vacuum degree for inlet of the tail tunnels and so on under 11 kinds conditions of tremendous load fluctuation. These conditions include the design conditions, the check conditions and the superposition conditions. Finally, the computing results have been analyzed and summarized. The end chapter is the general comment of the whole-length content and the describing of the intending view of researching.

本文以三峡右岸地下电站尾水洞设计为背景，从工程实际出发，阐述了变顶高尾水洞的工作特性、使用范围及其研究现状；详细论述了适用有压流的特征线法、适用明满交替流的普里斯曼解法等数学模型；边界条件的给定和明满交替流的计算方法；用Fonran语言编制了数值计算程序，对三峡右岸地下电站变顶高尾水洞的大波动工况进行了数值模拟，分别得出了在设计工况、校核工况和叠加工况下蜗壳末端最大压力上升值、机组最大转速上升值和尾水管进口最大真空度等重要参数；对数值计算结果进行了详细分析并得出了有价值的结论；最后展望了今后水电站变顶高尾水洞的研究方向。

Withdraw the bag cage, release the damaged bag from the tube sheet by pressing one point of the snap ring inwards and remove the bag.

取出袋笼，把扣环一端向里压，从管板上取下破损的袋子。

The technology is similar to Volkswagen's recently announced Gasoline Compression Ignition system, which works by using spark plugs during start-up and hard acceleration, while relying on sparkless compression ignition, like a diesel, during low load situations.

这项技术与大众最近宣布的汽油压燃系统很相似，它利用起动和急加速时利用火花塞，而在低负荷情况下就像柴油机一样依靠无火花塞的压缩燃烧。

In order to obtain actual preferred principle of processing parameter about three-roller backward spinning of tube,nonlinear FEA software ANSYS/LS-DYNA is,carried on 3D dynamic simulation,stress analysis and strain analysis to three-roller backward spinning of tube under different processing parameter.

为了确定更为符合实际的筒形件三旋轮强力反旋工艺参数的选用原则，利用大型非线性有限元软件ANSYS/LS-DYNA对不同工艺参数下筒形件三旋轮强力反旋旋压过程进行了动态模拟和应力应变分析。

According to instantaneous velocity fields and vorticity fields measured with SPIV, detailed analysis of the evolution of tip leakage vortex at both design and near stall conditions is presented in this thesis and the different phases of the evolution of the tip leakage vortex, the formation, becoming unstable and the interaction between small-scale vortices and the mainstream can be clearly observed in the experiment results.

SPIV测量结果表明压气机转子叶尖泄漏涡在设计和近失速状态下均存在形成、发展壮大和失稳分裂的演化过程。

Because starting resistance is the characteristic of mud-stone, there is the ultra-pressure of fluid in the pores is inevitable if there are neither cracks nor faults.

因为启动阻力是泥质岩层的固有特征，所以，在没有裂缝或断层的情况下，孔隙流体超压就必然存在。

Because the starting resistance can express the characteristics of the mudstone,the ultra-pressure of fluid must exist in the pores if there are neither cracks nor faults.

因为启动阻力是泥质岩层的固有特征，所以，在没有裂缝或断层的情况下，泥质岩层就必然存在孔隙流体超压。

According to piezoelectric equation and vibration theory of quartz crystal, we studied the elastic wave＇s transmission characteristic in a AT-cut thickness-shear-vibration quartz crystal, and the frequency conditions of which quartz crystal resonator formed stationary wave in electrode district.

根据石英晶体的压电方程和晶体振动理论，研究了AT-切石英晶体厚度切变振动模式下振动频率与结构参数间的关系，以及石英晶体谐振器在电极区形成稳衡驻波的频率条件及电极区外波的传播特性。

Slowly he is being crushed under an aggressive steamroller, and there's nothing or nobody on the horizon that will stop him from being run over.

慢慢地，他是被压死下一个咄咄逼人的高压手段，并没有什么或没有人在地平线上，将阻止他从正在运行的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。