Experimental result shows that the surface of ductile iron casting has a large amount of magnesium, and, there is a gradient distribution of magnesium from external to internal in the cross section.
实验结果表明，镁在球墨铸铁件表面大量富集，在整个横截面上由外到内呈梯度分布状态。
Strong two dimensional effect on the field penetrating speed should be included in the fluid analysis for a plasma space distribution with high density gradient.
对于等离子体空间分布存在较大的密度梯度的物理问题，必须考虑二维空间特性对磁场渗透速度的影响。
This paper presents an expression for temperature distribution in growing crystal by considering the ambient temperature gradient as a variable introduced in LEC model.
本文把环境温度梯度作为一个变量引入LEC法生长的理论模型中进行分析，得到了晶体中温度分布的表达式。
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