The area calculating formulas of burning surface and channel section have been derived by the graingeometry.
根据装药几何形状，导出了在火箭发动机工作过程中燃烧面积及通道截面积变化规律的计算公式。
2
Research results indicate that the pore geometry of the rock and soil shows the fractal behavior over the range from atom scale to grain size.
大量的研究表明，岩土介质的孔隙几何从原子尺度到晶粒尺寸范围内均表现出分形特征。
3
The mechanical properties of TP2 copper tube are not only involved with internal factors, such as grain size and geometry, but also with environmental temperature.