The speed function defined in Level set method can be divided into two classes: function based on the gradient of image and function based on the image gray.
水平集方法的速度函数定义根据所利用的图像信息可以分为两大类：基于图像梯度和基于图像灰度信息。
The cooling speed gradient leads to a gradually changed microstructure of the fused materials.
依冷凝速率梯度不同，该组成样品可以获得显微结构渐变的熔融材料。
This article describes drainage design principle for planted roof, and puts forward that increasing drainage gradient of both roof and growing medium layer could speed up water discharge.
叙述了种植屋面的排水设计原则，提出可通过加大屋面排水坡度和种植介质表面排水坡度等措施，达到快速排放屋面积水的目的。
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