three dimensional diffusion 三维扩散
three-dimensional diffusion model 三维扩散模型
three-dimensional convection and diffusion [物] 三维对流和扩散
The structure is made up of cylinder model with three-dimensional diffusion, which upper and side surfaces can meet the gas at the same time to enlarge the area with gas.
该传感器敏感膜结构由离散的微型圆柱体单元三维式扩散模型组成，模型上表面和侧面同时接触被测气体，扩大了与被测气体的接触面积。
First, the neutron diffusion equation is converted to three coupled one dimensional partial flux equation through transverse integration.
首先通过横向积分将中子扩散方程化为三个互相耦合的一维偏通量方程。
Finally, under the three-dimensional ECOM model, the Particle-tracing Method is applied to the numerical modeling of the Changjiang Estuary sewage diffusion.
最后，本文在三维ecom模型下把质点跟踪法应用到了对长江口污染物扩散的数值模拟中。
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