这次撞击2500万年后，也就是三叠纪-侏罗纪灭绝事件中，crurotarsan和其它至少一半的动物都灭绝了。
Then, 25 million years after that, in what’s known as the Triassic-Jurassic extinction event, the crurotarsans and at least half of all other animal species vanished.
为智能叠层板自由振动问题和带有压电块的叠层悬臂梁的瞬态响应等问题提出了一种新的半解析法。
A new semi-analytical solution for the natural vibration of smart laminated plates and the transient response of the laminated cantilever with piezoelectric patch was presented.
进一步和有限元法相结合，得到了能够分析具有任意边界条件和几何形状的复合材料叠层厚板的半解析数值方法即哈密顿单元方法。
Combined with the finite element method, the semi-analytical numerical method presented can be used to analyze thick composite laminates with arbitrary boundary conditions and geometrical shapes.
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