volume diffusion

It is deduced that the main sintering mechanisms shill be volume diffusion and grain boundary diffusion for pure boron carbide and grain boundary diffusion for carbon_doped boron carbide showing activated sintering.

纯B4C的烧结致密化机制为体扩散和晶界扩散，而掺碳B4C的烧结机制主要为晶界扩散，因此，掺碳对B4C起到了活化烧结的作用。

Perturbational finite volume method for convective diffusion equation and discussion

对流扩散方程的摄动有限体积（PFV）方法及讨论

With actual measurement, some thermodynamic parameters such as bulk specific heat volume C ρ, coefficient of heat conductivity λ, and coefficient of heat diffusion H were obtained.

对计算中用到的材料参数如体积比热容Cρ、导热系数λ和热扩散系数H进行了实际测量和校正。

Then a one-dimensional unsteady incompressible flow with moving pollutant source model was proposed. The continuity equation, momentum equation and convection-diffusion equation were discredited using finite volume scheme.

接着，根据双线铁路隧道运营通风的特点，建立了一维不可压缩非恒定流和流动污染源的物理模型以及山相应的连续性方程、动量方程和对流扩散方程构成的数学模型；

The experimental results show that the growth mechanism of the KTP crystal coincides with the linear law and the law of the parabola of surface or volume diffusion of the BCF atomic growth theory.

实验结果表明，KTP晶体生长机制与原子化的BCF生长理论的面扩散或体扩散的线性定律与抛物线定律相吻合。

The SiC/ Al laminated graded composites were fabricated by vacuum hot-pressure method, and the effective joining among the composites of different volume fraction of SiC particles was realized by heat diffusion pressure.

用真空热压法制备了SiC Al层状梯度复合材料；采用热压扩散工艺，实现了不同SiC含量的复合材料间的有效连接。