accumulated retained percentage

The author obtains two important parameters the percentage of single deposition and cumulative percentage of deposition, and gets the working hours of cooling tower pond in all work condition.

本文详细研究了遭遇不同含沙量供水工况时 ,冷却塔水池的淤积情况 ,得到了两个重要参数—单次淤积百分率和累计淤积百分率 ,并据此得出了各种工况下冷却塔水池的运行历

The trends of visibility from 1960 to 2002 have been analyzed by using three different statistical methods: cumulative percentiles, Ridit analysis, and frequency of “very good” visibility.

用累积百分率分析法、Ridit分析法和“非常好”能见度出现频率分析法分别对河北省11个城市1960～2002年的大气能见度进行了研究和分析。