The mechanism of shock formation apparently changes, too, at these altitudes so that the scaling laws are no longer applicable.
在这个高度下，冲击形成的机制也有很明显的改变，所以递增公式也就不再适用了。
The shock formation in a nonlinear ultrasound beam by solving KZK equation using frequency-domain numerical method is investigated.
通过用频域方法数值求解KZK方程； 以活塞声场为例，研究了非线性超声束的冲击波形成规律。
The results reveal that besides the nonlinearity and absorption, the diffraction is another important factor that affects the shock formation of an ultrasound beam.
结果表明：除了非线性强度、吸收外，衍射是另一个影响非线性超声束冲击波形成的重要因素。
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