With increase of heat input and laser power density, the cross section of the weld transformed from nail shape to near X shape.
随焊接热输入和激光功率密度的增大，焊缝截面由钉形向近X形转变。
The results showed that the distribution of dislocations and twins in the same cross section is even, but their density varied along the axis direction of the polysilicon ingot.
结果表明，在相同的结晶条件下各类晶体缺陷在多晶硅锭的同一横截面上呈均匀分布，但在沿结晶生长方向上不同部位存在较大差异；
The reaction rate of neutrons with matter depends on the density of neutrons, their velocity, the nuclear density and the particular interaction cross section.
中子和物质的反应速度与中子的密度、中子的速度、原子核密度以及特有的反应截面有关。
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