It is pointed out that this method of estimating attenuation spectrum, as one can be used for ultrasound tissue characterization...
文章最后指出，这种衰减谱估计方法因为能在活体条件下对组织进行定征而具有研究价值。
If a proper non - linear change of the instantaneous frequency is realized, we can get a frequency spectrum whose input is the mean of the reciprocals of bed attenuation coefficients.
如果把瞬时频率作适当的非线性变化，就可以得到一个以地层衰减率的倒数的平均值为输入的频谱。
The source spectrum of small-moderate earthquake can be represented by theoretical "Brune" model, the geometric attenuation factor of whole path can be represented by three-segment geometric model.
中小地震的震源谱可以用“布龙”理论模型表示，传播路径中的几何衰减因子可以用三段几何衰减模型表示。
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