The effect of crack shape in stagnant pool on solute tracer and the corresponding change of transport character are discussed especially.

重点探讨带滞水区的裂隙形态对其中溶质式示踪剂运移的影响及导致的运移特征变化。

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The effect of crack depth, crack shape, wall thickness ratio, the number of cracks etc. on singular stress field near the crack tip is investigated.

探讨了单裂缝与均布多裂缝情况下，裂缝深度、裂缝形状，厚壁筒壁率、裂缝数目等特性参量对裂缝尖端附近奇异场的影响。

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The polymers return to a pre-defined shape when heated to a certain temperature, and, when damage is detected, an infrared laser sends light through the network to the damaged area, triggers the shape-memory, and commands the area to repair the crack or tear -- regaining up to 96 percent of its original strength.

ENGADGET: Shape-memory polymer knows when it's hurt, fixes itself