Mechanisms of fluid circulation and mass transport comprise mainly advection or infiltration, diffusion and composite advection diffusion.
流体循环与质量传输机制主要包括平流或渗透、扩散以及平流-扩散复合机制。
Based on an analysis of rheology and mass transport principle, a mathematical model was formulated for describing the co-extrusion and diffusion process of graded index polymer optical fiber (GI POF).
基于流变学原理和质量传递原理的分析，建立了一个能够描述渐变型聚合物光纤(GI POF)共挤扩散制备过程的数学模型。
A totally new concept on mass transport path and diffusion mechanisms, which were different from the traditional thoughts, were raised at the end.
最后就固相烧结过程中的物质传输途径和扩散机制提出了有别于传统认识的全新的观点。
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