Tungsten grain is one material that has high strength and body-centered cubic structure, and it distributes in the matrix that is soft and has the surface-centered cubic structure.
其中钨颗粒是强度较高的相，体心立方结构的钨颗粒均匀的分布于面心立方结构、较软的基体相当中。
2
The result of XRD characterization shows that the prepared porous carbons comprise cubic carbon phase and the grain size of the carbon is decreased after high temperature treatment.
XRD测试结果表明多孔炭的物相中包含面心立方炭，经高温处理后多孔炭的晶粒尺寸有所减少。
3
A new expression of cubic sand grain concentration is put forward, and it is used as the boundary conditions in the calculation.