Vol 20, No 4 (2017)

In this paper we have investigated the dynamics of entanglement of two identical qubits nonresonantly interacting with one mode of a thermal electromagnetic field in lossless resonator in the presence of a direct dipole-dipole interaction. On the basis of the exact solution of the considered model, the Peres-Horodetskii entanglement parameter (negativity) for qubits has been found. Numerical simulation of the negativity for various model parameters has been carried out. It has been shown that the interaction of qubits with the thermal field of the resonator can lead to their entanglement. It ha been established that the detuning and dipole-dipole interaction of qubits can be used to manipulate and control the degree of their entanglement.

Features of radiation patterns of antennas on the basis of planar symmetric slot lines of constant width at a frequency of 10 GHz, in the E and H planes in case of change of their length and width were studied. The comparative analysis of mathematical modeling results and results of an experiment has shown that at increase of a regular slot width within 0,5 to 1,5 or 1,5 sm to 4,5 sm, the level of half power beam width of the main lobe in the E plane was narrowed, while it remained almost invariable in the H plane.

The article analyzes the interaction of electromagnetic waves in the regime of radio-impulse signals with an anisotropic medium over hydrocarbon deposits. The amplitude and phase characteristics of the combination components of the dielectric permittivity of the medium above hydrocarbons for electromagnetic waves with right and left circular polarizations are derived and analyzed on the basis of a quasihydrodynamic approach using multiparticle electron-ion currents. It is shown that the results of research can be used to identify the environment over deposits by the nature and magnitude of the total and difference components of the dielectric constant of the anisotropic layer.

The analysis of the working of the synchronization system of the receiver-comparator of GLONASS/GPS signals with recurrent filtering of dates about a divergence of a reference and forming time scales was taken.

This article deals with the calculation of color differences of two given colors in existing colorimetric systems of MCOs, as well as color differences obtained with the help of special formulas JRS 79, developed by the Committee on Colorimetry of the Royal Society of Dyers and Colorists (CMC) based on JRS-79, and the color difference formula recommended in 1994 by the ICE. At one time the author proposed a strictly equal-contrast color system, but in this system a rather complex mathematical apparatus based on tensor calculus is assumed. Therefore, this article proposes a simple technique for calculating color differences, using a fairly simple mathematical apparatus. The article presents the results of calculations of color differences between specific two colors. For what purpose, during the preparation of the article, a computer program was specially written that allows carrying out these calculations.