Comparing with the neutral cave on the smooth plane that was thumb - like and opened at the bottom , the neutral caves on the plane with single roughness elements were closed circles . with the growing of roughness element s height , the closed circle became smaller 实验中发现与光滑平板边界层的下端开放式的拇指型中性曲线相比较，有粗糙元平板的中性曲线为封闭式的环形曲线，随着粗糙元高度的进一步增加中性曲线收缩为更小的闭合环。
3.
It seems the ncz silicon has a higher bdt temperature compared with cz silicon ' s . it is suggested that the elastic effects and the electronic effects of nitrogen doped in silicon made the bdt temperature higher . the observation of fracture surface showed that it was curves at high temperature in brittle fracture , but smooth planes at room temperature 当温度升高达到硅材料的脆塑转变时，材料的断裂强度有个很大的提高，但是首次发现含氮硅单晶却不明显，而且掺氮的硅单晶脆塑转变温度比普通单晶高，可能是氮的掺入改变了硅材料的内部晶体结构及电子结构。
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