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.
植物主要是通过根系吸收养分，一般通过根系截获、质流和扩散三种方式。
Nutrients are absorbed mainly through roots of plants by interception, mass-flow and diffusion.
为研究水在安山质玻璃中的扩散规律以及火山喷发机理和成因提供了依据。
The results of the experiments provide the basis for the studies on diffusion regularity of water in Andesitic glasses and the formation causes and mechanism of volcanic eruption.
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