...指数这个概念叫做节径，现在的都叫做谐波指数在循环对称结构的动力学分析中，节径（nodal diameter) 和谐波指数(harmonic index)的含义是什么，它们对求解结果有何影响？此外，是不是在ansys9.0版本中不能指定按节径数进行模态分析了？
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但由于实际波形中含有大量的谐波分量甚至指数衰减分量，直接影响了这些算法的精度。
Because real waves contain numerous harmonic wave and even exponentially. attenuating components, the accuracy of an algorithm depends on its filterability.
结果低机械指数谐波超声造影对恶性病变诊断的的敏感性、特异性和准确性分别为96%、90.7%和93.8%。
Results The sensitivity, specificity and accuracy of diagnosing malignant liver tumors by contrast-enhanced harmonic ultrasonography with low mechanical index were 96%? 90.7%? 93.8% respectively.
指数型号筒具有抑制高低次谐波的作用；
The exponential type horn can suppress high harmonic wave and low harmonic wave.
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