目的：了解电解质和电压因素对氧化膜成分、形态和稳定性能的影响。
Objective: To know the effects of electrolyte and voltage on the property of anodic oxide films.
熔体过热处理的弛豫过程和引起的不可逆过程使熔体状态变化出现滞后效应，从而影响定向凝固界面形态稳定性。
The influences of hysteresis and relaxation of melt superheat on the morphological stability of interface in directional solidification were described.
结果PDI能够更好地反映狭窄血管的真实形态，明显增加肾动脉的显示长度和血流的稳定性，减少检查时间。
Results PDI provides better morphologic feature, better renal artery length and better flow stability, as well as a shroter exam time.
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