本文对二元无规混合系统提出了一种边界条件，改进了在渗流阀值附近的简单有效介质理论。
A kind of bounds to improve the effective medium theory in the vicinity of percolation threshold for the two-phase random composities is proposed.
运用修改过的有效介质理论及多层膜理论计算了这种表面的反射率谱，并将结果与实测值进行了比较。
The modified effective dielectric theory and multiple layer film theory are employed to calculate the reflection spectrum of this kind of surface.
理论分析和数值实验均表明：多尺度数值方法对求解多孔复合介质周期结构的热传导和质扩散问题是可行的和有效的。
The theoretical analysis and numerical experiments show that the multiscale finite element method presented in this paper is very effective to solve above these kinds of problems.
以多孔介质双重有效应力理论为基础，结合地质力学知识，建立了水平地应力的计算模型。
Based on the double effective stress theory and Geomechanics, this paper has built a horizontal crustal stress calculation model.
对多孔介质体积平均理论进行简化，得到简化的热质传递干燥模型，用一个理论式表达模型中有效扩散系数。
Based on the fact, a simplified drying model of heat and mass transfer is deduced from volume average theory.
复象散波理论是一种分析三维介质雷达罩电磁特性的有效方法。
The complex astigmatic wave theory is used to analyse the electromagnetic characteristics of 3-d radome.
复象散波理论是一种分析三维介质雷达罩电磁特性的有效方法。
The complex astigmatic wave theory is used to analyse the electromagnetic characteristics of 3-d radome.
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