The article is devoted to the development of a methodology for estimating the probability of an object auto tracking failure by the mobile robot video system under the influence of external factors caused by random vibrations of the mobile platform. The mathematical formulation of the probabilistic analysis problem is based on the processes representation occurring in the system by a vector stochastic differential equation. The condition for the auto tracking failure is the exit of the tracked object from the of the video system field of view and non-return to it within a specified time. The probability of auto-tracking failure depends on the dynamic tracking system properties and is described by a recurrent formula that accounts the probability of an object being out of the field of view and the probability of its non-return. The method of calculating the failure probability includes the solution of two ordinary differential equations systems for probabilistic moments. One system of equations characterizes the probability density of tracked object location coordinates distribution in an open area of space. Another system of equations characterizes the change in time of the probability density of the tracked object coordinates, which is outside the video system field of view. A simplified example is given that clearly illustrates the evolution of the system probabilistic characteristics under the study in space and time.

The phenomenon of synchronization is used in many fields of science and technology, and especially in radio engineering. With the help of synchronization, for example, it is possible to solve the problem of stabilizing the frequency of powerful self-oscillators. The paper experimentally shows that frequency fluctuations at the output of a synchronized continuous mode generator do not always correspond to frequency fluctuations of the synchronizing oscillation even in the middle of the synchronization band. The minimum possible frequency fluctuations at the output of a synchronized oscillator are determined by fluctuations in the phase difference in a synchronized oscillator. The latter, in turn, depend both on internal causes associated with complex processes occurring inside the device, and on external causes associated with pulsations of supply voltages, mechanical influences and parameters of synchronizing oscillations.

The statement of the problem of the dual control of the regression object with multidimensional-matrix input and output variables and dynamic programming functional equations for its solution are given. The problem of the dual control of the extremal regression object, i.e. object response function of which has an extremum, is considered. The purpose of control is reaching the extremum of the output variable by sequential control actions in production operation mode. In order to solve the problem, the regression function of the object is supposed to be quadratic in input variables, and the inner noise is supposed to be Gaussian. The sequential solution of the functional dynamic programming equations is performed. As a result, the optimal control action at the last control step is obtained. It is shoved also that the optimal control actions obtaining at the other control steps is connected with big difficulties and impossible both analytically and numerically. The control action obtained at the last control step is proposed to be used at the arbitrary control step. This control action is called the control action with passive information accumulation. The dual control algorithm with passive information accumulation was programmed for numerical calculations and tested for a number of objects. It showed acceptable results for the practice.

The article is devoted to the design and use of a software application for the automatic formation of the products layout and the calculation of the criterion "useless material" when cutting sheet materials. A functional model of production for the manufacture of products cut from sheet material is described. This model allows determining the place of the developed application in the production process. The application implements deterministic algorithms and an evolutionary (genetic) cutting algorithm. The results of the study of algorithms for the cutting maps formation according to the time of finding a solution and the criterion of “useless material” are presented. Developed application allows you to find the total area of products, the free area as the difference between the area of sheet material and the total area of products. The software application is written in JavaScript using the React library.

Two-layer Al/Nb (1000/200 nm) was deposited by sputtering using a DC magnetron method on Si wafers. The anodizing was in 0.2 M oxalic solution at 53 V, re-anodized in the 0.5 M boric acid in potentiodynamic mode at increase of potential until 400 V. For forming anodic composite nanostructure, the porous anodic aluminum oxide was partially removed in 50 % aqueous solution of phosphoric acid at 50°C for 1200 s. The morphology, photoluminescence, and optical reflection of an anodic composite nanostructure were investigated. The anodic composite nanostructure showed effective optical reflection in the wavelength range from 540 to 1000 nm, and the maximum reflective efficiency was observed at a wavelength of 850 nm, 52 % reflectance occurs. The photoluminescence maximum was observed at a wavelength of 453 nm.

The traditional image descriptor definition algorithms are considered, such as SIFT, ORB, LBP, GLSM. With the help of them, the searching task for a similar anatomical area on the CT images of the lungs is solved. The article proposes a methodology for performing a comparative traditional algorithms for determining images descriptors analysis and optimal anatomical features. Algorithms are tested when searching for a similar anatomical layer in the framework of the computer tomography images layers of of light patient, as part of the search for similar anatomical form on the layer among the computer tomography images of light two patients, and among the images of computed tomography of light hundred patients. As a result, it is determined that GLSM shows the best results when solving the task of classifying an image anatomical area (averaged error of determining the anatomical layer is 5 %). It is determined that the optimal signs on the lungs correspond to the presence of organs: heart, liver and top edge of the lung. Conclusions are fomulated about the need to use neural network methods to improve the error in determining the similar layer containing the necessary anatomical structure.

For the production of integrated analog circuits with a small-scale integration, which are developed to operate at temperatures up to minus 200 ℃ and/or with absorbed dose of gamma radiation up to 5 Mrad, a gallium arsenide master slice has been created. The following types of active elements are used in this master slice: DpHEMT with gate dimensions 100 ηm/0,2 ηm and 10 ηm/0,2 ηm; p-n-p HBT, they were chosen for realization of most common analog circuits of operational amplifiers, comparators, voltage followers. Despite the small number of available DpHEMT with high transconductance for circuit synthesis and volt-ampere characteristics features of DpHEMT experimental samples, which exclude use of those transistors at low drain current, master slice give opportunity for developing charge-sensitive amplifiers (CSA) circuits with only one type of active elements – DpHEMT. At the same time, correct choice of the operating point of transistors provide development of low-noise, high-speed CSAs with better parameters than silicon CSAs for sensors with internal capacitance up to 100 pF. So, developed on GaAs master slice CSA with head DpHEMTs and ratio of the gate width to its length, equal to W/L = 2000 and W/L = 3000, characterized by current consumption I_CC = 5,46 mA and I_CC = 5,25 mA, rise time t_R = 10,7 ns and t_R = 9,6 ns, equivalent noise charge ENC = 3960 el, and ENC = 3700 el. with sensor capacitance of 50 pF, while the CSA with a head silicon p-channel junction field-effect transistor has W/L = 3870, I_CC = 6,99 mA, t_R = 27,7 ns, ENC = 5360 el. with the same sensor capacitance.

Portable, mobile and mobile subsurface radar detectors are in high needed for localizing inhomogeneities and hidden defects in monitoring the condition of road surfaces, studying the upper layer of the earth's surface during humanitarian demining and identifying caches. Despite the presence of a number of specialized devices, the problem of ensuring reliable operational detection of near-surface and shallow objects has not been fully resolved. One of the promising directions in the development of a subsurface radar detector with an increased efficiency of object detection when deepening up to 1,5 ... 2 λ is associated with the use of a continuous ultra-wideband FMCW signal and optimization of the structural design of the system, which ensures the maintenance of a given height of rise of the antenna unit above the studied environment with its high mobility. The article presents the results of the development of a self-propelled subsurface radar detector with a continuous probing signal, including the substantiation of the technical appearance of the device, the development of a concept layout and the results of experimental studies. The device is made on a four-wheeled automated platform with an adjustable console on which the antenna unit moves. With the forward movement of the platform, a sequential radar survey of the upper soil layer is performed, the results of which in the form of a surface projection of the normalized power of depth portraits are displayed on the monitor screen. The conducted field tests of the device showed reliable detection of near- and subsurface objects made of dielectric and metallic materials.

The electrokinetic possibilities of separation and concentration of S.aureus bacteria in human whole blood (test mixture) were studied using a new design of a four-electrode biosensor chip format with transparent microelectrodes. In the measurements, a closed cell was used, into which the test mixture was poured. The electrokinetic movement of bacteria during concentration was observed when AC voltage was applied to the first and second annular external electrodes, and DC voltage was applied to the third and fourth semicircular central electrodes. The process of separation of erythrocytes and concentration of bacteria was recorded by an optical method. It is shown that the concentration of bacteria appears after 8 minutes and increases by 30 minutes in the region of the central electrodes under model conditions. The measurements were carried out on two biosensor chip formats having almost identical electrophysical parameters of capacitance and conductivity at frequencies from 100 Hz to 1 MHz. It is determined that the amplitude-frequency mode and biosensor chip format can be used to develop methodological support for the identification of bacterial species, but only by optical methods. It is shown that in order to increase the number of bacteria on both of the central electrode in the concentration mode, it is necessary to increase the speed of the electroosmotic flow at alternating current, by optimizing the composition of the medium and the parameters of the electrical regime in order to equalize the rates of separation and concentration processes.

The article deals with issues related to the possibilities of the analytical technique for the synthesis of quasi-two-band matching devices and the way to improve it. The technique is based on the mathematical apparatus of the Generalized Darlington method with the use of a special method of forming quasi-two-band frequency characteristics at the stage of choosing an approximating function. A comparison of the results of load matching obtained using the developed methodology and a progressive numerical synthesis method is presented. The analysis of the solved problem allowed us to make a private assessment of the capabilities of the proposed analytical method of matching. An important limiting circumstance for the synthesis technique is indicated – the lack of solutions for loads of increased complexity, which is caused by a small variability of the known approximating power transfer functions. As a solution to the problem, boundedly flat functions are considered, which differ from classical approximations in their extended variability. The use of a combination of knowledge about the formation of quasi-two-band frequency characteristics and the technique of using limited-flat functions made it possible to expand the range of matched loads. A solution to the test problem of matching a 5-element load is presented, for which the use of classical approximations is not acceptable.

The purpose of this research is to analyze the structure and circuit design of stand-alone photovoltaic system with a battery-capacitive energy storage device to ensure voltage stability under peak voltage and a variable nature of the power generated by a solar panel. There is an original active control scheme for a hybrid drive. The peak power of the solar panel was 100 W. The battery part of the energy storage device was represented by a 12 V gel lead-acid battery with a charging capacity of 11 Ah, and the capacitive part consisted of a battery of supercapacitors with an electrostatic capacity of 80 F, an operating voltage of 15.5 V. A rheostat was used as a load during a stationary discharge of the storage device with a resistance of 12 Om, and the pulsed nature of the discharge was simulated using an automobile air compressor. The analysis of circuit design variants that implement the charging process the capacitive part of the energy storage device from a solar panel directly or with a shunt DC/DC converter is performed. Charging and discharging of the battery part was controlled by the ProStar-15 controller. In both cases, charging buffer modes the battery and capacitive parts of the energy storage device were used. The research results have identified ways to increase the stability of the output voltage under peak voltage and the variable nature of electricity generation conditions while increasing the resource of an expensive battery.