In this study a new analytical formulation for electromagnetic wave scattering from rough boundaries interfacing inhomogeneous media is presented based on the first-order approximation of the small perturbation method. First, we considered a scattering problem for a single rough boundary embedded in a piecewise continuously layered medium. As a key step, we introduced auxiliary wave propagation...

Experimental data reveals that attenuation is an important phenomenon in medical ultrasound. Attenuation is particularly important for medical applications based on nonlinear acoustics, since higher harmonics experience higher attenuation than the fundamental. Here, a method is presented to accurately solve the wave equation for nonlinear acoustic media with spatially inhomogeneous attenuation....

Abstract In this contribution, we present the first numerical simulations of a relativistic outflow propagating through inner hundreds parsecs its host galaxy, including atomic and ionized hydrogen, cooling effects ionization. Our results are preliminary, but observe efficient shock ionization hydrogen in interstellar clouds. The mean density medium these initial is lower than that expected typ...