Vol 21, No 2 (2018)

In this paper we have investigated the dynamics of entanglement of two natural or artificial two-level atoms interacting through multiphoton transitions with a thermal field of an lossless microwave cavity. On the basis of the exact solution of the model under consideration, the atom-atom entanglement parameter for various initial separable and entangled states of atoms are found. It is shown that the interaction of atoms with the thermal field of the cavity by means of multiphoton transitions can induce entanglement for all states except for the one in which both atoms are excited. It is also established that for the initial separable states of atoms the maximum degree of entanglement increases with the multiplicity of atomic transitions.

For modeling of self-oscillations in the generator with autotransformer communication the numerical and analytical method which is based on representation of self-oscillatory system in the form of set of oscillators of the main frequency and its harmonicas is offered. The leading oscillator generates strictly monochromatic self-oscillations in discrete time and excites the compelled fluctuations of oscillators of the highest harmonicas. The main attention is paid to generation of the third harmonica in schemes with transformer and autotransformer communications. It is shown that the offered method of modeling allows to give comparative estimates of amplitudes of harmonious components of a spectrum of self-oscillations.

On the basis of the measurement of instant amplitudes executed by a stroboscopic method on discrete intervals of time, and veyvlet-transformations of the reflected signals also the local effective surfaces of dispersion of the object of irregular shape irradiated by a ultra-broadband impulse are investigated integrated. The analysis of frequency dependences of power ranges is carried out and parameters of veyvlet-transformations for identification of the dominating centers of secondary radiation of an object are determined.

At the present time, for the maintenance by condition system the problems of the radioelectronic equipment technical state parameter justifying and grouping are solved, as well as solved the problems of the maintenance periods, the level of training and the number of maintenance personnel, the determining the technical state parameters values forecasting methods, the intervals for anticipating the product time between failures justifying, but these solutions are obtained under the condition of failure intensity stationarity. The study of failure intensity in the course of its nonstationarity has not been fully carried out. To carry out such studies, a mathematical suitability model has been created. Presented in the scientific article radio electronic equipment maintenance by condition system suitability model will make it possible to decide whether it is reasonable to use the current maintenance strategy or not, to restructure the maintenance system parameters and to make a decision about its suitability for a given failure intensity «behavior».

The algorithm for estimating the fatigue reliability of soldered joints of radioelectronic modules of level 1 and 2 is given. Engelmayer’s mathematical models were used as initial data. The program of calculation in the object-oriented language Java is developed. The test task is considered. It has 9 classes and provides high speed and speed calculations.