为了研究多孔介质的性质，而假设一种单相介质，其性质与多相介质在宏观平均相同，这种假设的单相介质就称为该多相介质的“有效介质”，该种理论称为有效介质理论。
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.
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