The analysis of construction principles of passive optical networks was carried out. Options for attacks on PON-network and attacks from the subscriber were discussed. The possibility of such attacks was evaluated. Method of protection from attacks by use of scheme of WDM-PON was proposed.

Some problems arising in the construction of control systems for groups of unmanned aerial vehicles were analysed. Possible solutions are considered.

(FeIn₂S₄)_0.5×(AgIn₅S₈)_0.5 single crystals have been grown with method of directional crystallization. Their composition and structure were determined. It is seen that the pointed compounds and solid solutions are crystallized in the spinal cubic structure. The elementary cell parameters was calculated with the least square method. The thermal expansion was measured by a dilatometric method, the coefficient of thermal expansion was determined. Debye temperature and the mean square dynamic displacements of atoms for grown single crystals were calculated.

The investigation results on grating lobes suppression method are described in this paper. Grating lobes appear in pattern of multimodule antenna array, if stair-step phase distribution of element excitation is used. Stair-step here means the case when the phase of elements is constant within one module, and changes linearly from one module to adjacent. Described approach makes possible to excite every module from one common source and shorten, for example, the total transmit / receive module quantity in multimodule digital active antenna array by a factor equal to the radiators quantity in one array's module.

Single mathematical models of the signals' frequency characteristics, links and responses of telecommunications and radioelectronics systems were suggested. These models embody and epitomize amplitude- and phase-frequency responses of all types of linear links, as well as the amplitude and phase spectrums of no periodic finite, no periodic eternal, periodic signals, and the responses corresponding to them. The algorithm for calculation of frequency and energy characteristics has been developed on the basics of suggested models. The algorithm allows creation of effective automated simulations procedure of signals, links and responses in frequency domain.

The factors which has an effect on distribution of electromagnetic energy in concealing surface and model of signal that reflected from subsurface object which allows to take into account existing patterns and features of radar image formation were examined in the article.

A laboratory installation for photocatalytic water purification from organic pollutants has been developed. It includes a flow reactor, replaceable light sources of visible and ultraviolet ranges, indicator and control units. The installation provides testing at room temperature of the efficiency of photocatalysts, deposited on the solid and perforated flat substrates at a flow rate of 0.2-1.2 l/min of purified water.

The dependences of the main technological parameters of the obtaining process for permanent connections production in modular type constructions by ultrasonic welding influence on the quality of its final result are given, the degrees of the criterial variables by the predictors determinism variations are determined. The models obtained during researches using regression analysis, the active planning method and the complete factor experiment, allow to determine the required values of the main technological parameters by the calculation method.

SOL-GEL METHOD, BARIUM TITANATE, FILTER.

The results of device-technological and schematic simulation of the silicon Hall sensor with the purpose of determine its dynamic characteristics are presented. The influence of the dimensions of the active region is investigated, the theoretical and actual values of the upper limit of the bandwidth of the Hall sensor are determined, taking into account the internal parasitic capacitance, and the presence and absence of a capacitive load. The characteristics of the Hall sensor combined on a single crystal with a differential amplifier are simulated.

The methodology of the numerical solution of the internal problem for a two-element wire radiator based on the Pocklington integral equation is developed. The methodology is highly accurate, does not require its verification for convergence, is optimized for computational costs, and can be generalized to antennas with several passive elements.

The algorithm for joint detection-measurement of the range of elements of the group target in the surveillance radar based on the valuation-compensation method is substantiated. The algorithm is multistep and involves at each step detection, estimation of the arrival time and complex amplitude of the dominant signal, subtraction of its copy from the received implementation and an estimation of the noise level for the subsequent step. It is shown that the application of the algorithm for the characteristic range of signal / noise ratios provides stabilization of false alarms and an increase in the probability of correct detection of elements of a group target.

An overview of a simple and efficient method to abort execution of a running kernel on graphics processing unit when it is required for fast release of its resources is presented. Required conditions of the method and kernel feedback approaches needed for a kernel restart on another processing unit are described in details.

The exact solution for exciting a longitudinally irregular waveguide problem with a magnetodielectric filling up is presented.