Directional scattering by the hyperbolic-medium antennas and silicon particles

Medium Access Control in Ad Hoc Networks with Omni-directional and Directional Antennas

Wave scattering by small impedance particles in a medium

The theory of acoustic wave scattering by many small bodies is developed for bodies with impedance boundary condition. It is shown that if one embeds many small particles in a bounded domain, filled with a known material, then one can create a new material with the properties very different from the properties of the original material. Moreover, these very different properties occur although th...

Wave scattering by many small particles embedded in a medium

Theory of wave scattering by many small bodies is developed under various assumptions concerning the ratio ad , where a is the characteristic dimension of a small body and d is the distance between neighboring bodies d = O(aκ1), 0 < κ1 < 1. On the boundary Sm of every small body an impedance-type condition is assumed ∂uM ∂N = ζmuM on Sm, 1 ≤ m ≤ M , ζm = hma, 0 < κ, hm are constants independent...

Wave scattering by small particles in a medium

Wave scattering is considered in a medium in which many small particles are embedded. Equations for the effective field in the medium are derived when the number of particles tends to infinity. © 2007 Elsevier B.V. All rights reserved. PACS: 03.65.Nk; 43.20.+g; 62.30.+d

Connectivity of Graphs Induced by Directional Antennas

This paper addresses the problem of finding an orientation and a minimum radius for directional antennas of a fixed angle placed at the points of a planar set S, that induce a strongly connected communication graph. We consider problem instances in which antenna angles are fixed at 90◦ and 180◦, and establish upper and lower bounds for the minimum radius necessary to guarantee strong connectivi...