ELECT The specific differential attenuation caused by large raindrops and a special form of melting hail is computed and studied. Raindrops of smoothed conical shapes and hailstones modelled by an ice sphere surrounded by a water torus are considered. For the former, scattering computation is carried out by the T-matrix method, while the higherorder method of moments in the surface integral equ...

This paper proposes a novel dust-storm total path attenuation prediction model. model is formulated as function of specific (dB/km) and the effective distance, which considers non-uniform dust storm intensity variations throughout link. The distance obtained combination link reduction factor. factor developed based on modeled 2-D structure observed characteristics. A measurement campaign atmosp...

It is useful to have the ability to analyze the propagation of errors from transmission data into the resulting attenuation-corrected PET reconstruction. We develop theoretical expressions for the mean and covariance of the emission reconstruction when the only noise source is that in the transmission data. There are several ways to impose an attenuation correction onto the PET reconstructions,...

A direct method for the measurement of the optical attenuation coefficient and the scattering anisotropy parameter based on applying the extended Huygens-Fresnel principle to optical coherence tomography images of blood is demonstrated. The images are acquired with a low-power probing beam at the wavelength of 1300 nm. Values of 12.15 mm(-1) and 0.95 are found for the total attenuation coeffici...

There are different approaches towards estimating the signal strength in indoor environment, which includes models such as empirical and deterministic models. Empirical Models are simple but less accurate whereas deterministic models have more accuracy but much more complex. In this paper we have identified some limitations of the most widely used empirical model i.e. ‘Wall Attenuation Model’ a...

The coda wave decay (CWD) method was used to estimate the quality factor from amplitude rate for broadband seismic stations (IBDR, MSL, and NSR4) using a single backscattering model. This research aims calculate attenuation coefficient frequency-dependent (α) three compare them comprehend details of Earth's crust structure in those stations. Then, test if they are homogenous or not. Also, inves...

S U M M A R Y We study analytically and numerically effects of attenuation on cross-correlation functions of ambient noise in a 2-D model with different attenuation constants between and outside a pair of stations. The attenuation is accounted for by quality factor Q(ω) and complex phase velocity. The analytical results are derived for isotropic far-field source distribution assuming the Fresne...