In this paper a printed dipole antenna and three slot antennas are designed to operate at 10 GHz for use in radar systems. A parametric study of each antenna and comparison between their radiation properties including return loss, bandwidth, directivity, efficiency and radiation patterns for 6element linear array are introduced. Microstrip slot antennas show wider bandwidth, less coupling and s...

Solitary waves bifurcated from edges of Bloch bands in two-dimensional periodic media are determined both analytically and numerically in the context of a two-dimensional nonlinear Schrödinger equation with a periodic potential. Using multiscale perturbation methods, the envelope equations of solitary waves near Bloch bands are analytically derived. These envelope equations reveal that solitary...

In this study, the nanosphere lithography (NSL) method was used to fabricate hybrid Au-Ag triangular periodic nanoparticle arrays. The Au-Ag triangular periodic arrays were grown on different substrates, and the effect of the refractive index of substrates on fabrication and optical properties was systematically investigated. At first, the optical spectrum was simulated by the discrete dipole a...

This paper addresses the application of integrated chargeability and resistivity method and grade data in modeling and evaluation of copper deposits. We argue that the relationship between IP, Rs and grade data may be used for modeling and reserve estimation and tested this argument for Sarbisheh copper deposit that is located in eastern Iran. Geology and mineralization situation of Sarbisheh d...

We determine the transmission of light through a planar atomic array beyond limit low intensity that displays optical bistability in mean-field regime. develop theory describing intrinsic bistability, which is supported purely by resonant dipole-dipole interactions free space, showing how bistable amplitudes exhibit both strong cooperative and weak single-atom responses they depend on underlyin...

We study the motion of a vortex dipole in a Bose-Einstein condensate confined to an anisotropic trap. We focus on a system of ordinary differential equations describing the vortices’ motion, which is in turn a reduced model of the Gross-Pitaevskii equation describing the condensate’s motion. Using a sequence of canonical changes of variables, we reduce the dimension and simplify the equations o...

Based on the features of the OFDM (Orthogonal Frequency Division Multiplexing) and the SFN (Single Frequency Network) techniques used in the modern digital TV broadcasting systems, for example, the European DVB-T, a compact planar antenna is developed. This antenna is operated in the UHF band and owns the characteristics of horizontal polarization reception and wideband. To meet the wideband op...