For airand spaceborne weather radars, which typically operate at frequencies of 10 GHz and above, attenuation correction is usually an essential part of any rain estimation procedure. For ground-based radars, where the maximum range within the precipitation is usually much greater than that from airor spaceborne radars, attenuation correction becomes increasingly important at frequencies above ...

We present an 0( N log N) algorithm for the simultaneous evaluation (at all N points of a uniform mesh) of a function conjugate to a periodic spline. The algorithm is based on the attenuation factor theory and makes use of the FFT. It can be applied to other function classes with known attenuation factors also. For the approximation by functions conjugate to splines of odd degree we state sever...

In this paper we show that the introduction of an attenuation factor in the brightness equations relative to various perspective Shape-from-Shading models allows to make the corresponding differential problems well-posed. We propose a unified approach based on the theory of viscosity solutions and we show that the brightness equations with the attenuation term admit a unique viscosity solution....

Tropospheric propagation impairments that a!ect earth}space communication signals increase in severity with the increase of frequency. Introduction of satellite services using higher frequency bands such as Kaand V-band requires the characterization of propagation factors that are normally considered negligible at lower frequency bands. Cloud attenuation is considered one such factor. Clouds ar...

Rain attenuation is a major shortcoming of microwave transmission. J.S Ojo1, 2, M.O Ajewole1, S.K Sarkar2. An improved approach of predicting rain attenuation cumulative. rain attenuation formula Approach for determining the values of rain attenuation at different.Attenuation due to rain is an important constraint in the designing of the microwave. The paper presents a new prediction model of r...

Abstract We investigate the specific attenuation factor for Bessel models of viscoelasticity. find that quality this class can be expressed in terms Kelvin functions and its asymptotic behaviours confirm analytical results found previous studies rheological properties these models.

Attenuation, time lag, outflow peak and storage are very essential factors required in flood risk prediction pattern. However, the accurate strongly depends on appropriate calibration of routine parameters model, such as weighting factor (x) constant (K). The being used to determine has not been given consideration previous studies this could have led inaccurate past. In work, a set data obtain...

Introduction: The main goal of SPECT imaging is to determine activity distribution inside the organs of the body. However, due to photon attenuation, it is almost impossible to do a quantitative study. In this paper, we suggest a mathematical relationship between activity distribution and its corresponding projections using a transfer matrix. Monte Carlo simulation was used to find a precise tr...