结果表明：由渗氮试样的碳浓度分布曲线可精确确定渗氮层深。
The results show that the nitriding depth was determined accurately by the carbon concentration profiles.
在不稳定的流动状态下，气体的径向浓度分布曲线两边出现不对称。
In the unstable flow the radial distribution of tracer gas concentration is asymmetry.
通过分析平板膜超滤分离过程，描述了超滤过程动量传递和质量传递的微分方程，求解方程得到速度分布和浓度分布曲线。
By analyzing the ultrafiltration process of flat membrane, differential equations of momentum transfer and mass transfer describing the process are established.
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