We calculate the field emitted by a pulsed point source above a planar interface. It is found that the observed power spectrum can differ significantly from the emitted spectrum. Also, the observed power spectrum depends strongly on the wave speeds in the two media and on the position of the observation point with respect to the interface and the source.

let $r$ be a commutative ring and let $m$ be an $r$-module. in this article, we introduce the concept of the zariski socles of submodules of $m$ and investigate their properties. also we study modules with noetherian second spectrum and obtain some related results.

a multicone graph is defined to be join of a clique and a regular graph. a graph $ g $ is  cospectral with  graph $ h $ if their adjacency matrices have the same eigenvalues. a graph $ g $ is  said to be  determined by its spectrum or ds for short, if for any graph $ h $ with $ spec(g)=spec(h)$, we conclude that $ g $ is isomorphic to $ h $. in this paper, we present new classes of  multicone g...

For seismic resistant design of critical structures, a dynamic analysis, based on either response spectrum or time history is frequently required. Due to the lack of recorded data and randomness of earthquake ground motion that might be experienced by the structure under probable future earthquakes, it is usually difficult to obtain recorded data which fit the necessary parameters (e.g. soil ty...

Background: Monte Carlo and experimental relative dose determination in a water phantom, due to a high dose rate (HDR) 192Ir source is presented for real energy spectrum and monochromatic at 356 keV. Materials and Methods: The dose distribution has been calculated around the 192Ir located in the center of 30 cm ×30 cm ×30 cm water phantom using MCNP4C code by Monte Carlo method. Relati...

I study the Coulomb drag between two identical layers in the Anderson insulting state. The dependence of the trans–resistance ρt on the localization length ξ is considered, for both a Mott insulator and an Efros–Shklovskii (ES) insulator. In the former, ρt is monotonically increasing with ξ; in the latter, the presence of a Coulomb gap leads to an opposite result: ρt is enhanced with a decreasi...