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。
The ground reflection and attenuation must be properly accounted for in order to use the source spectrum measured at the site of the observer to predict the actual source spectrum in the free field.
为利用观察点处实测声频谱来预估实际声源自由场频谱特性，必须适当地计及地面反射和衰减效应的影响。
It is proved that the method is fit for adjusting some optical fiber spectrum attenuation.
实验结果表明，该方法对特定的光纤传导系统的光谱非线性衰减有较好的校正效果。
Fixing the spectrum width of the weather echo signals, we change theirs mean Doppler frequency and filter them using regression filter. After filtering, we analyze the attenuation of them.
在天气回波信号谱宽固定的情况下，通过改变天气回波信号的平均多普勒频率，分析了回归滤波器对它的衰减情况。
The attenuation is extracted by the spectrum of the layers at different depth.
利用不同深度界面的回波频谱分析提取衰减系数剖面。
Results shown the continued attenuation of the dipole moment in the last 50 years, and the variation of spatial spectrum of geomagnetic field continuously decreased.
研究中发现最近50年偶极矩仍在继续衰减，空间功率谱的变化也呈减小趋势。
Attenuation of wave amplitude of reservoir rock at simulated high temperature and pressure is measured with spectrum-amplitude comparison mediod in laboratory.
在实验室内用频谱振幅比较法模拟测试了储集层岩石在高温高压下的弹性波振幅衰减值。
The paper analytically discusses two factors, the spectrum of photon and the scattered radiation by the detector, which affect the attenuation efficient of the object in flash X-ray radiography.
研究闪光照相中影响材料有效吸收系数的两个主要因素，即X光的能谱效应和散射影响。
The spectrum effect on attenuation coefficient is less than 5%. The material densities can be reconstructed with such precision.
在图像重建中利用上述的线吸收系数能够反演出精度达5%的材料密度。
Attenuation by different kinds of aerosols has been calculated on the basis of size distribution measured in the real atmosphere and compared with the results measured by solar spectrum.
根据实测的气溶胶粒子谱对大气气溶胶在8—13微米窗区的衰减效应进行了计算，并和利用太阳光谱得到的某些实测结果进行了比较。
But under sea ice, the attenuation coefficient of PAR is little bit different, as the spectrum of the light has been changed by selective absorption through the sea ice.
在海冰覆盖的条件下，PAR的观测结果与无冰海水的PAR有明显差别。由于海冰选择性的吸收，穿透海冰进入海洋的PAR组分已经不同，海水对PAR的衰减系数也会相应变化。
But under sea ice, the attenuation coefficient of PAR is little bit different, as the spectrum of the light has been changed by selective absorption through the sea ice.
在海冰覆盖的条件下，PAR的观测结果与无冰海水的PAR有明显差别。由于海冰选择性的吸收，穿透海冰进入海洋的PAR组分已经不同，海水对PAR的衰减系数也会相应变化。
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