In approximate calculation of radiation transport differential equation absorption coefficient is a fundamental parameter.
辐射传输方程微分方法的近似解通常以吸收系数为基本参数。
When using a common sampling tube, a formula for approximate calculation of the flow in the sampling tube is needed to meet the request of equi-speed sampling.
在使用普通型采样管时，为了满足采样现场的要求，应有一个与之相适应的等速采样流量近似计算公式。
The equivalent time method (ETM) for approximate calculation of the transient temperatures displacements and thermal stresses in 3-d structures is proposed in this paper.
本文提出了一种计算三维结构瞬态温度、位移和热应力的近似方法——等效时间法。
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