1 Methods The ultrasonic attenuation coefficient and the ultrasonic speed of series of micro-sized composite materials have been detected, compared and analyzed.

2 The power attenuation coefficient and the change of the coherence of the laser through the sediment-laden water are obtained in the experiment.

3 The attenuation coefficient shows approximately linear behaviour with frequency over the frequency range used, and the attenuation slope increases with the void content.

4 Among which, is the attenuation coefficient at the single scattering approximation, representing the attenuation rate when the laser passes through medium in unit distance.

5 It is shown that the attenuation coefficient will decrease obviously with the increase of Mach number, and the nonlinear acoustic resistance and acoustic mass will reduce slightly.

6 The research result and the rain attenuation coefficient thus obtained provide valuable reference not only in WLAN and immobile wireless accessibility but also in mobile communication.

7 GD model combined the effective attenuation coefficient as axial exponential attenuation factor.

8 The attenuation coefficient is determined to at least partially compensate for the target angle heel effect.

9 Climatic conditions have great effect on attenuation coefficient K. K value is relatively lower on sunny days and higher on cloudy days.

10 Meanwhile,[] the existence of the acoustic attenuation coefficient benefits the axial resolution.

11 For improving the precision and sensitivity of the instrument, a "ratio method" for measuring attenuation coefficient has been taken.

12 On the basis of a model, the relationship between the attenuation coefficient and the propagation distance can he deduced by solving a differential equation.

13 Conclusion The way in diagnosis of fatty liver by uses of echo intensity histograms to calculate the attenuation coefficient is of clinical value and a kind of objective and simple method.

14 Using this device, we can measure many oceanic optical parameters such as diffuse attenuation coefficient, remote-sensing reflectance, water-leaving radiance and so on.

15 This shows that an earthquake may be predicted by making use of the variations of the frequency attenuation coefficient if the available data are properly processed.

16 Single wavelength collimation transmittance experiment is designed and conducted, with total effective attenuation coefficient of tissue phantoms being obtained.

17 Increase of total suspended matter results in decrease of transparency and increase of beam attenuation coefficient.

18 The acoustic parameters include complex reflection and transmission coefficient (echo reduction and insertion loss), attenuation coefficient, complex acoustic impedance and sound speed.

19 Furthermore, a new experimental method used to study the relation between the attenuation coefficient and the density or the depth of the scattering matter is proposed.

20 It is demonstrated by theory and data observed in different time at same location that the attenuation coefficient of PAR is independent of the intensity of radiation.

21 In this paper, a mathematical model is used to characterize this random signals, and a time averaging method is used for obtaining the ultrasonic attenuation coefficient.

22 In this paper, the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

23 The rock acoustic parameters in this paper include wave amplitude, spectral amplitude, spectral area, spectral density, wave velocity and attenuation coefficient etc.

24 Experiments in laboratory and sea beach are conducted separately. In this experiment, compressional wave velocity and attenuation coefficient are measured using this system.

25 The basic yields of a CT scan, the CT numbers, are related to the attenuation coefficient of the diagnostic X-rays, actually reflect the electron densities of the individual tissue concerned.