Attenuation Properties of Dusty Media Using Mie Scattering Solution

Abstract

A realistic model is developed to predict the specific attenuation when electromagnetic signals propagate through dusty media (dust storms). The model is based on Mie approximation for the scattering of electromagnetic signal by a spherical particle. Variation of the dust particles dimensions is considered in this model. Reliable published values for dust dielectric constant are used for computations over the frequency range from 2 GHz to 100 GHz, (i.e., S-band, X band, K-band, Ka-band, Ku-band and W-band). The model outcome is compared with the results from other models suggested in literature. The effect of air humidity on specific attenuation is also investigated.

Complexity factor for anisotropic source in non-minimal coupling metric f(R) gravity

“…Sharif and Yousaf [25] explored the solutions in cylindrical symmetric model with anisotropic collapsing matter distribution under the expansion-free parameter, which evaluate the vacuum cavity and also conferred some families solutions and additionally to get each family have two exact models. Sharif and Zaeem [26] found the impacts on charged cylindrical expansion-free collapsing source with local anisotropic geometry that established in the significance of disequilibrium condition under the perturbation approach.…”

Dynamical analysis of charged anisotropic spherical star in f(R) gravity

“…The magnetic and Coulomb forces are the major source for resisting the gravitational pull [35]. A star needs a large amount of charge in order to stay stable among the strong gravitational pull [36]. Such electromagnetic tension also leads to homogeneity on large scales.…”

“…Such electromagnetic tension also leads to homogeneity on large scales. In modified f (R) theory, some work has been done on the aspect of instability of collapsing stars by considering combined effect of electromagnetic field and f (R) model [36]- [39]. Motivating by this work, we have chosen f (R) = R + αR n − µ 4 R m and charged anisotropic fluid to workout the instability problem.…”

Charged cylindrical polytropes with generalized polytropic equation of state

“…(23) in the above equation, we obtain anisotropy factor for case 1 given in the appendix; see Eq. (41). One can derive a modified LEE for conformally flat polytropes by using Eq.…”

“…Sharif and Fatima [40] presented cylindrical collapse with a charged anisotropic fluid. Sharif and Azam [41] studied dynamical instability of cylindrical collapse in the Newtonian and the post Newtonian regime. Ghua and Banerji [42] described dissipative cylindrical collapse with a charged anisotropic fluid.…”