DSpace Collection:
http://www.openstarts.units.it:80/dspace/handle/10077/4159
2015-07-30T12:02:49Z
2015-07-30T12:02:49Z
Low Frequency Electromagnetic Scattering. The Impedance Problem for a Spere
Venkov, George
Arnaoudov, Yani
http://www.openstarts.units.it:80/dspace/handle/10077/4231
2012-10-09T09:34:22Z
2001-01-01T00:00:00Z
Title: Low Frequency Electromagnetic Scattering. The Impedance Problem for a Spere
Authors: Venkov, George; Arnaoudov, Yani
Abstract: We consider the low-frequency scattering problem of a plane electromagnetic wave by a small sphere, of the boundary of which an impedance condition is satisfied. The impedance boundary condition was introduced by Leontovich (1948) and it accounts for situations where the obstacle is not perfectly conducting but the exterior field will not penetrate deeply into the scatterer. Il provides a method to simulate the material properties of the surface of highly absorbing coating layers. For the near electromagnetic field we obtain the low-frequency coefficients of the zeroth and the first order while in the far field we derive the leading non-vanishing terms for the scattering amplitude, the scattering and the absorption cross-sections.
Type: Articolo
2001-01-01T00:00:00Z
Singular semilinear elliptic equations in the half-space
Tintarev, Kyril
http://www.openstarts.units.it:80/dspace/handle/10077/4230
2012-11-26T10:52:42Z
2001-01-01T00:00:00Z
Title: Singular semilinear elliptic equations in the half-space
Authors: Tintarev, Kyril
Abstract: We show that equation $x_{N}^{q}\Delta u+u^{p-1}=0$ on the half-space
$Y=\mathbf{R}^{N-1}\times\left(0,\infty\right)$ and on some of its
subsets has a ground state solution for $q=N-\frac{p\left(N-2\right)}{2},\; p\;\epsilon\left(2,2*\right)$.
For N $\geq$ 3 the end point cases p=2 and p=2{*} correspond to eh
Hardy inequality and the limit exponent Sobolev inequality respectively.
For N=2 the problem can be interpreted in terms of Laplace-Beltrami
operator on the hyperbolic half-plane.
Type: Articolo
2001-01-01T00:00:00Z
Special relativity without physics
Pfeffer, Washek F.
http://www.openstarts.units.it:80/dspace/handle/10077/4229
2011-04-04T23:35:00Z
2001-01-01T00:00:00Z
Title: Special relativity without physics
Authors: Pfeffer, Washek F.
Abstract: Using only causality and the constant speed of light, I derive the PoincarĂ© transformation group. In this derivation I make no a priori assumptions about the linearity or continuity of the transformations
Type: Articolo
2001-01-01T00:00:00Z
A monomiality principle approach to the Gould-Hopper Polynomials
Noschese, Silvia
http://www.openstarts.units.it:80/dspace/handle/10077/4228
2011-04-04T23:34:59Z
2001-01-01T00:00:00Z
Title: A monomiality principle approach to the Gould-Hopper Polynomials
Authors: Noschese, Silvia
Abstract: We show how to derive properties of the Gould-Hopper polynomials using operational rules associated with the monomiality principle.
Type: Articolo
2001-01-01T00:00:00Z