本文从理论上分析了因孔洞而产生的正 透镜或负透镜效应并给出了归一化透过率的表达式。

We analyze the positive and negative lens effect caused by the hole theoretically and give the expression of normalized transmittance in this condition.

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在致密化加工过程中 ，材料的密度和力学性能明显提高 ，沉积坯中的界面和孔洞明显愈合 ，材料的显微组织趋于均匀。

With the densification, material density and mechanical properties are promoted distinctly, the boundaries and cavities in the deposits are welded and the microstructure reaches even.

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