结果表明观察组脑底动脉收缩期峰值血流速度明显高于正常对照组，差异非常显著（P＜0．01）；

The result showed that systolic peak velocity of bottom cerebral arteries in heroin addicts was much higher than that of the normal control group (P<0.01).

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试验表明：冰盖下泥沙起动流速与冰盖及槽底糙率的相对比值有关。

The experiment results show that the threshold velocity is affected by the ratio of roughness coefficient of ice cover and bed.

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利用该流速分布模型，得到挟沙水流的卡门常数沿垂线是变化的结论，即从近底区的约0.4渐变到主流区的小于0.4。

By use of this model, it is demonstrated that the Karman constant is varied in vertical distance from near (0.4) in near bed region to below (0.4) in main flow region.

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