The complexity and high cost of multiplexing optical fiber sensors is still the main limitation for the widespread introduction of sensory systems, both distributed and quasi-distributed, and point-like. The article proposes a new multiplexing method that takes advantage of both broadband and two-frequency radio-photon multiplexing systems. The simplest broadband radiator is taken from the first, but a complicated and expensive system of spectrometry is not used to determine the central wavelength of fiber Bragg gratings. From the second, a recording system is used at the beat frequency between two components, but an expensive system for generating two- and polyharmonic probing systems is not used. The multiplexing parameter is determined by the frequency of separation between the transparency windows of a fiber Bragg grating, for example, with two phase π-shifts, which differs by a certain value for each of the sensors. The mechanism of modeling of gratings of the specified type is given, in principle the possibility of multiplexing of various number of sensors is shown. When using sensor networks built on the basis of passive optical, the number of multiplexed sensors can reach 256, with all sensors having the same Bragg wave of the wave, and can be combined into tree, bus and other topologies.

Keywords: fiber Bragg grating, phase inhomogeneity, fiber optic sensor, multiplexing, transparency window, frequency difference between transparency windows, beat frequency

Theoretical studies of the temperature distribution during laser heating of the TiO2 precursor film on the FTO/glass substrate have been carried out. The simulation was performed on the basis of a numerical solution of the heat equation in the Matlab program to determine the energy density of the laser radiation necessary for crystallization of TiO2. It was shown that on the surface of the TiO2 precursor the temperature reaches a maximum value at a time point of 133 ns with the Gaussian temporal form of the laser pulse. The optimum energy density for crystallization of the TiO2 precursor film with the nanosecond pulse duration is 1.3-1.6 J/cm2, when the film thickness temperature corresponds to 400-500 °C. The obtained results of the simulation are consistent with experimental studies.

Keywords: numerical simulation, laser heating, temperature distribution, TiO2 film, solar cell

Numerical solution to the problem of heat transfer in boundary layers transparent Strip on the walls, exposed on the opposite side of the radiant-convective heating. Study of influence of mode parameters on heat transfer process of tasks carried out in the case of the gradient flow and included the most typical variants of transportation processes. The purpose of the real work is studying of processes of transfer at non-linear boundary conditions, obtaining approximate and analytical decisions non-linear warm and a mass transfer, establishment of communication between regime parameters and physical interpretation of results of a research. Also some conjugate problems of heat exchange in the presence of radiation are studied. The analysis received decisions is carried out. The executed research allowed to establish that existence of a transversal overflow of heat in a wall and also the radiation of a surface have significant effect on the nature of distribution of the surface temperatures.

Keywords: boundary layer, convection, radiation, gradient flow, conjugate heat transfer

In this article, the actual task of automating the working processes for the design of offshore oil and gas facilities is considered. Developed software packages are provided that allow to provide higher quality of work, to shorten the development time due to automation of routine operations and the process of obtaining output documentation, as well as its operative updating and reissue when making changes.

Keywords: Bentley MicroStation, 3D modeling, offshore oil and gas facilities, design.

The paper is considered modelling the process elaboration of a pit for high-rise building in the case of dense urban area. The research is analyzed stress strain state of soil with retaning wall. The authors are developed various design solutions of the retainig wall to decrease of displacement of the nodals in soil finite element model. According the results, it has selected rational design solution of retaining wall.

Keywords: dense urban areas, retaining wall, finite element method, stress-strain state, soil massif

In this paper, we describe three target distribution methods for vehicle group control. The purpose of the methods being developed is to increase the number of defenders who survived after the fight with the enemy. The first method introduces a priority system based on the distance to the robot, as well as the distance to the protected area. The second method is based on the application of the modified swarm particle method, and the third method is based on the evolutionary-genetic algorithm. To demonstrate the work of each method, software was developed in C # and Python. The performed simulation showed the effectiveness of each method developed. Sixty experiments were carried out, 3 parameters were evaluated in each experiment. The best results were achieved using a method based on the priority system.

Keywords: vehicle, group control, priority, target distribution, optimization, particle swarm optimization, evolutionary-genetic algorithm, heuristic method

The analysis of 11 image processing algorithms for microobjects recognition in the histological sections of the biotissue is carried out. It is shown that for images obtained with different microscopes and dyes, there is no one universal method of image processing. The choice of the algorithm depends to a large extent on the specific type of microscope. Considered algorithms give more reliable results for high-contrast images when using a confocal microscope.

Keywords: image processing, edge detection, biological microobjects, OpenCV, ImageJ, morphometric processing, matching

Numerical solution of the problem of heat transfer in the boundary layers of transparent gas wall, exposed on the opposite side of radiant-convective heating. The energy dissipation due to viscosity is negligible, the wall is thermally thin, and the physical properties of the medium do not depend on temperature. The aim of this work - finding the local heat transfer coefficients (Nusselt number) needed for the analysis of heat exchangers. When solving the problem of nonlinear transfer functions linearizing method is used, based on which numerical scheme for computer calculations was constructed. The intensity of the local heat transfer in the boundary layer is determined by the number Kx = Nux / Nux0, where the value Nusselt numbers refer to the conditions under consideration of the problem of heat exchange (Nux) and constant surface temperature (Nux0). From a physical point of view, non-dimensional parameter Kx is a measure of the intensity of heat transfer in the boundary layer on a nonisothermal surface compared to heat transfer when the wall temperature everywhere the same. The analysis of this research showed that in radiative-convective heating number Kx on the front edge of the plate takes the largest value of Kx ≈ 1,37 corresponding to a constant heat flux on the wall. It is also shown that the relative temperature of the incoming flow has a significant impact on the value of Kx. The effect of this setting is especially evident in the processes when dominated by the effect of radiation and related to the nonlinearity of the transfer processes. The analysis revealed the influence of basic parameters of heat transfer on the development of transport processes in the boundary layer by heating radiation and convection simultaneously.

Keywords: Boundary layer, convection, radiation, radiation-convection heating, high temperature gas invironment, linearizing function

Methods for conducting polarization measurements on electrodes made of 1X18H9T steel are considered. Anodic polarization curves of steel 1X18H9T were obtained in solutions of electrolytes without stirring and with stirring. Comparison of the obtained anodic polarization curves allowed to reveal the rational current densities for realization of technological processes of combined anodic and mechanical processing of this steel.

Keywords: polarization curves, electrolytes, 1X18H9T steel, combined treatment

The problem of filling vertices of an oriented graph is considered. It is assumed that the choice of vertices from which the filling will be made and their number are determined by us. The filling process is assumed to be discrete. The capacity of arcs and the capacity of vertices are integers. In this formulation, the problem can be considered as a model for the consideration of irrigation in closed irrigation networks, the delivery of goods through the network.

Keywords: oriented graph, irrigation system, graph capacity, logistic system, delivery of goods, filling of verti-ces of an oriented graph, network methods, transport task

In the present work, a study was made of the properties of a photocatalyst-adsorbent based on metal oxide, which was titanium dioxide (TiO2). The photodegradation activity of two organic dyes under the action of light was analyzed. The effect of the phase composition of the photocatalyst was compared on the example of three modifications of TiO2 - rutile, anatase and their mixture.

Keywords: TiO2, photocatalysis, metal oxide, dyes

The work is devoted to modeling the dependence of the temperature of the extrusion process in the melting zone on the composition of the feedstock and the rotational speed of the screw shaft. The quality of the finished product can not be determined in real time, but it depends on the values ​​of the technological parameters of the production process. Therefore, the quality of products can be controlled through the control of technological parameters. Therefore, the problem of determining the temperature dependence is an important problem. The model is obtained on the basis of experimental data from a number of alternative models. As parameters, the rotational speed of the screw shaft was used. As a criterion for the quality of the model, the sum of the theoretical model errors from the experimental data is used. As the speed of the screw shaft increases, the temperature of the extrusion process increases with a gradually decreasing rate. The resulting model of the extrusion process can be used in automatic extrusion control systems to control the quality of finished products.

Keywords: extrusion model, screw extruder, screw speed, extrusion, finished product quality

The purpose of the study is a promising, rapidly developing and demanded area of SLAM (simultaneous localiza-tion and mapping). The simultaneous location and construction of a map is a practical problem of autonomous robotics. The basic principle is to place the mobile robot in an unknown environment where it was able to gradual-ly build a consistent map of this terrain while simultaneously determining its location within the map. To date, the work is aimed at improving the efficiency of computing and solving problems in data integration. In the process of constructing a map of the environment by the mobile robot and simultaneously using it, in order to determine its location, online, the path of the platform and the location of all landmarks are simultaneously evaluated without the need for a priori knowledge of their location.

Keywords: localization and mapping, probabilistic breech-cha, extended Kalman filter, particle filter, mobile robot, re-cursive method, Gaussian

This article is dedicated to the research of existing methods of analysis and detection of persons in natural conditions. Face recognition based on image analysis is one of the main problems in the implementation of computer vision. The systems of reference measurements allow to define and develop various methods of face detection. Practical experiments were conducted and the algorithms for recognizing faces presented by scientific schools and commercial developments were considered, and also the results of evaluations on all test sets were analyzed based on the data of graphs of truly positive values for assessing the quality and speed of using MALF. Using a detailed assessment, the effectiveness of algorithms in various aspects with respect to several attributes was analyzed. Comparing performance with varying degrees of accuracy, the advantages and disadvantages of algorithms are determined when used in various work scenarios.

Keywords: computer vision, face detection, face detection, face recognition, image analysis algorithms, detection methods, reference measurements

When managing complex systems, for example, an industrial enterprise, an organization, a socio-economic system, etc., it is necessary to take into account the fact that they can be considered as polystructural systems, i.e. as a set of heterogeneous systems, interconnected. A poly-structural system is understood to mean a variety of different components, differing in physical properties, functional purpose, complexity of the internal structure, representing a single whole. The article deals with the management of a polystructural system based on the preparation of management decision making by experts who can evaluate an alternative from the standpoint of a specialist of several elements of a polystructural system. To develop methods for determining and selecting an informed management solution, a polystructural system is considered from the standpoint of system theory and system analysis. A mathematical model is developed, which is the basis for creating information and algorithmic support for the management of the polystructural system.

Keywords: management of a polystructural system, the choice of an administrative decision, indicators, a problem situation, the method of analyzing hierarchies, reducing the complexity of the examination