流明

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。

It buys you an additional 1000 hours of lamp life, and it quiets the fan down to almost silent, but this is a radical reduction of lumen output compared to industry norms.

该公司购买你一个额外的灯泡寿命1000小时，而且产生的噪音的风扇几乎沉默下来，但是这是一个激进的流明输出相比，减少了行业标准。

Normally indicated in ANSI lumens American National Standards Institute measurement of "candle" power

通常用ANSI 流明注明美国人&蜡烛&权力的国家标准协会测量

In comparison with Halogen lamps: lumen, color temperature and life cycle is much higher.

与一般的卤素灯对比：流明、色温、寿命都要高于卤素灯。

An older unit, the lumen per square foot, or foot-candle, has become obsolete.

一种较老的单位是每平方米英尺的流明数，即英寸烛光，这种单位已经废除。

Like other projectors, it has a variety of operating modes that are calibrated to deliver different lumen outputs, gammas and color balance.

像其他投影机，它有一个校准的操作系统，提供不同的流明输出，玛机和各种色彩平衡模式。

The maximum brightness of 250 nits is quite high for a PC lcd monitor, too.

最高亮度为250流明，是相当高的电脑液晶显示器，太。

It offers 330 nits of brightness and is simply gorgeous to look at.

它提供330流明的亮度，看起来简直称得上华丽。

Fill lumen – Feed continues to enter the shell side via lower feed manifold, however, top backwash discharge valve is closed and filtrate exhaust valve is opene

装满流明–喂食继续通过较低的喂食歧管进入外壳边，然而，最高的冲洗卸下电子管被关闭并且过滤废物电子管被打开。

Note: When setting ENERGY STAR specifications EPA strives to promote high efficiency and high quality products.

流明的持续这一标准能够使得消费者对产品质量好坏有更好的认知。

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。