The loops of the dielectric hysteresis of a soft ceramics based on PZT with Curie temperature TC=210℃ are investigated. The studies were carried out at a frequency of 50 Hz in two modes. In the first of them, the field was switched on by 0.07 seconds, in the second - it operated continuously. The amplitude of the field E_m varied from 2.5 to 25 kV / cm and switched stepwise with an interval of 15 minutes. The coercive field EC and the switchable polarization P_m were determined. The switching polarity in the saturation region turns out to be no more, in contrast to BaTiO3 and other materials, but less than the corresponding values obtained with short-term switching.

Keywords: piezoceramics, piezoelectric material, hot pressing, dielectric hysteresis

In this paper, samples containing gold nanoparticles (NPs) distributed in different optically transparent media have been synthesized and characterized. A liquid (aqueous) and a solid (porous silicate glass and polymer (polyvinylpyrrolidone)) media were used. The samples obtained were characterized by optical spectroscopy and electron microscopy. The position of plasmon resonance band was analyzed depending on the dielectric constant of the medium.

Keywords: gold nanoparticles, colloidal solution, polymer, porous glass

The article deals with topical issues related to the need to improve the efficiency of dust collection systems, the correct choice of the method of purification of emissions and the design of industrial filters linking the operating modes of devices with the properties of the captured dust. A method of complex treatment of emissions with a wet dust collector built into the process line is proposed.

Keywords: wet dust collectors, efficiency, system efficiency, optimization, emissions, ecology, dust collection

This article describes the operation of panels from wood, sheathing from sheets and under the conditions of shear fixing in the form of ribs, an examination of the energy method that allows to determine the shear deformations of panels made of wood. Could get dependencies that determine the effort. They occur on each nail, nailed to the contour and to the inner edges of the panel. Proceeding from this, we developed a computer program that determines the numerical values of the angles by the method of successive approximations.

Keywords: wood panels, plywood coatings, shear forces and deflections, energy method, computer program

Overhead contact system is a part of electric traction network which doesn’t have safety margin of a construction that’s why its using in winter becomes much difficult. The most heavy overhead contact system work is the operating regime in wind and ice loading because of wind and increasing not only on wires and suspension strands but on supporting structures. Ice loading on wires makes current-collecting conditions much worse and taking into account operational factors it can be a cause of a traffic accident and trains stop. The authors examine some methods of ice prevention, their efficiency effect and the capacity of their combining. In connection with this it is very important to trace ice load as early as possible. Equipment set for thermodynamic method instantiation and its fixing variant are represented.

Keywords: traction power system, overhead contact system, contact wire line, ice loading, loading, testing methods

In the article we have considered the actual problem of determining the error in visualization of generalized control criteria. It is indicated that the most common nonlinear interaction of parameters in technical systems is the multiplicative interaction of measured physical quantities. Based on the fact that the physical elements of the processor measuring channel have linear dynamic characteristics, it is concluded that the application of nonlinear transformations for quantitative estimates of the properties of monitoring systems requires linearization, the errors of which undoubtedly affect the accuracy of the final mathematical model and its magnitude may be is estimated and attributed to the methodological error of visualization. The process of linearization is considered for the example of the multiplicative interaction P of measured physical quantities. As a result of the analysis of the properties of many industrial control objects under the conditions of steady-state technological processes, it was found that they are characterized by small fluctuations with respect to the mathematical expectation (no more than 10%), which makes it possible to apply the obtained mathematical models of errors arising in the process of linearizing the measurement equations for control criteria, for design and research works.

Keywords: control objects, measuring system, programmable logic controllers, visualization error, mathematical expectation, adaptive control, linearized measurement equation, measurement error

The article deals with the question of constructing an analytical model in assessing a person's functional state. It is indicated that for complex measurement problems it is advisable to use the principles of constructing measuring systems, formulated in terms of system functions using the fractal-categorical approach; the technique is applicable in the design and analysis of complex medical complexes, and the resulting system function of a complex medical complex is the basis for further analysis within the selected method; The structural-analytical method for constructing complex systems makes it possible, by analyzing the requirements and constraints of the system, to optimize the functions of transferring control actions, to build blocks, parts of the structure on their basis, and to optimize inter-unit communications. The approach described in the article to the process of hematological research makes it possible to analyze the adaptive response of the body's hematopoietic system to external influences of a different nature and intensity.

Keywords: structural and analytical method, information-measuring system, information flows, hematopoietic system, category diagram, functors, adaptation contour, bioinstrumental information-measuring system, control signal, measurements.

When developing large information-measuring and control systems, special attention must be paid to the interaction of various blocks of the system with each other. For example, the structure of a software-hardware measuring channel consists of four consecutively connected elements: primary converter; analog-to-digital converter; software dynamic converter; digital to analog converter. To find the parameters of the measurement channel error, mathematical models were constructed for each of the blocks. Simulation modeling of the measuring channel was carried out. As the input signal, the first-order aperiodic link model is taken. To generate the interference signal, a random number generator with a noise level of 0.5 is used. The error for the measuring channel is found. The suggested mathematical model allows to find the tuning coefficients of the software of the measuring channel, which ensure the minimum information loss in the software-hardware measuring channel. The resulting model can be used in automatic control systems for the current identification of regulator settings.

Keywords: model of measuring channel, model of primary converter, adjustment of coefficients, error of measuring channel

The article considers the question of finding similarity between objects containing unstructured information based on the spectra of two objects. To find the spectrum, we use the adjacency matrix of the graph. The similarity between objects of comparison is determined using the approach based on the singular expansion of the graph contiguity matrices. Also in the article the existing solutions are considered and examples are given of the areas of possible application of the described approach

Keywords: spectrum of the graph, singular decomposition, adjacency matrix, unstructured information, analysis of large arrays of information

The article considers the experimental estimation of the heat transfer coefficient in a hybrid immersion cooling system with contact point cooling and dry zones. The change in the heat transfer coefficient is made through a change in the Reynolds number for the flow of the coolant in the immersion cooling system. The experimental investigation is carried out on the basis of a numerical simulation model of the process under study. As a result, the dependences of the thermal resistance of the processor-heat exchanger system on the heat transfer coefficient and on the Reynolds number of the turbulent flow were obtained, and the results with the simulation results were estimated. It is found that, with an increase in the Reynolds number, the heat transfer intensification is weaker than the theoretical one. The refinement coefficients for the case under consideration are found.

Keywords: processor, heat flow, thermal resistance, Laplace equation, turbulent flow, Reynolds number, heat transfer, immersion cooling system, immersion cooling system, cavitation

In this study, the task is to simulate the cooling system of supercomputers with a heat pump on the reverse Stirling cycle by numerical simulation of heat transfer processes in the object under study. The results of numerical simulation of heat transfer processes in the superheater processor cooling system with a heat pump on the reverse cycle are presented. A numerical model of the heat transfer process was investigated. As a result, the dependencies of the required thermal lift of the heat pump are obtained taking into account the thermal resistance of the system. The first liquid cooling circuit - the cold cylinder of the heat pump and the hot cylinder system - the second liquid cooling circuit, depending on the heat transfer coefficient of the heat pump.

Keywords: processor, heat flow, thermal resistance, Laplace equation, heat pump, heat exchange, Stirling backflow, cooling system

The article presents the results of studies conducted by foreign and Russian authors on the assessment of urban air pollution with fine dust of natural origin

Keywords: air quality, dust, fine particles PM10, natural origin, atmosphere

The work of the sensors of passenger traffic control in conditions of a dense stream of people in the controlled section of the doorway was conducted. The results showed the possibility of determining the direction of movement of a person due to a change in the distance between the sensor and the moving person. The interference due to the high density of passenger traffic, which, however, does not lead, however, to the development of the corresponding algorithms, to false alarms of the sensors is detected. However, additional field studies are required on the vehicle of the passenger counting device based on ultrasonic distance measurement sensors

Keywords: passenger, ultrasound, passenger transport, road transport, distance sensor, Arduino, bus

Flat bending stability problem of constant rectangular transverse section wooden beam, loaded by a concentrated force in the middle of the span is considered. Differential equation is provided for the cases when force is located not in the center of gravity. The solution of the equation is generated numerically by the method of finite differences. For the case of applying a load at the center of gravity, the problem reduces to a generalized secular equation. In other cases, the iterative algorithm developed by the authors is implemented, in the package Matlab. A relationship is obtained between the value of the critical force and the position of the load application point. For this dependence, a linear approximating function is chosen. A comparison of the results obtained by the authors with an analytical solution using the Bessel functions is performed.

Keywords: flat bending stability, secular equation, finite difference method, iteration process

The method of calculation gamma percentage fatigue resource of an arrow shovel excavator. Using this method can most accurately determine the distribution of the extreme members of samples and the corresponding shifts of the Weibull distribution. It was found that to calculate the shifts do not have, you can use only the extreme members of samples.

Keywords: reliability, probability, resource, sample, excavator