采用风速的韦布尔双参数方法测算出平均风能密度、平均有效风能密度，以及年风能可利用时间。
The mean wind energy density, mean effective wind energy density and annual available time of wind energy are calculated by using Two-Parameter Weibull Distribution function of wind speed.
其中使用手机最频繁者(占总人数的10%)十年间平均有效累积通话时间高达1640小时，相当于每天使用半小时。
The heaviest 10 percent of users had clocked up an average of 1,640 hours of phone use spread over 10 years, which corresponds to about half an hour a day.
结论最长发声时间可作为衡量嗓音功能的有效指标之一。发声气容量与肺活量比率及平均气流率做为衡量嗓音功能的临床指标均有意义。
Conclusion Maximum phonation time, the mean airflow rate and ratio of phonation volume to vital capacity can be used as indicator in clinical application.
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