The empirical formula for velocity decay was obtained by use of theoretical analysis.
通过理论分析给出了风口速度衰减的经验公式。
This paper proposes a scientific hypothesis that the resistance is linear and suggests a sectional average velocity formula for river flow which reflects the character of river.
本文提出了阻力线性假设，并结合河槽断面的具体情况，对河槽的断面平均流速公式进行了探讨。
Thus an analytic formula with two parameters of high explosive (i. e. detonation velocity and polytropic index) for estimation of the velocity of flying plate is established.
从而给出了用爆速和多方指数等两个炸药示性参量表出的估算飞片运动的良好近似公式。
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