在某个地方的完美球型壳层,厚度，我们把它叫做4πr平方，我们仅仅是把它,乘以概率密度。
a perfectly spherical shell dr at some distance, thickness, d r, dr we talk about it as 4 pi r squared d r, so we just multiply that by the probability density.
SEM分析表明，本工艺制得的微球表面铜沉积层厚度均匀，与基体间结合牢固。
SEM analyses shown that the copper film made by the technique on the surface of the microsphere is uniform, and its adhesion with the matrix material is strong.
采用缝纫工艺对基于预浸料辅层的复合材料进行厚度方向增强，用落球法进行了冲击损伤和冲击后压缩破坏实验。
The stitching process was applied to improve the properties in the throughthickness direction of composites based on prepreg materials.
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