The results showed that the process was happened by the reasons of atmosphere energy accumulating continuously and unstable energy releasing touched off by shear line in lower level.
结果表明：这次冰雹天气过程是由于低层大气能量不断积累、低空切变线触发不稳定能量释放而产生的。
When the motion of the basic state is the shear flow (or the differential rotation), this property means that the unstable waves would evolve automatically into the quasi-stationary stage.
当基态运动为剪切流(或较差旋转)时，这一性质将使不稳定波自动演化到准稳阶段。
It was found that the rheological behavior of UHMWPS is remarkably characterized by its unstable flow at low critical shear rate and ultrahigh melt viscosity.
结果表明，UHMWPS最显著的流变特征为超高的熔体粘度和低剪切速率下出现不稳定流动。
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