为求解二维的奇异摄动反应扩散边界层问题，研究了新的多尺度有限元法。
The multi-scale finite element method is applied in the 3-D groundwater flow simulation problems in heterogeneous porous media.
这一不透气的壳层(或边界层)会阻滞水分自由扩散，这种情形称为表面硬化。
This impervious layer or boundary will retard the free diffusion of moisture. This condition is referred to as case hardening.
各种操作条件只有影响到管程的温度边界层或壳程的冷凝液膜层和气-汽扩散层，才能强化或恶化传热过程。
When various manipulations disturb the thermal boundary layer inside or the condensate film and gas-vapor diffusion layer outside, the heat transfer effect will be better or be worse off.
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