This article discusses the need for modernization of existing thermal power plants (TPPs) in Moscow. The profitable aspects of technical re-equipment are considered, as well as the factors affecting the composition and implementation of investment projects for the development of existing thermal power plants in the capital are studied.

Keywords: thermal power plant, modernization, technical re-equipment, hazardous production facility, technical condition assessment, major repairs, investment project, service life, construction and installation works, technological equipment

The article describes the developed design of a sample of joining solid wood elements on SHERPA plates, which made it possible to simulate the operation of nodal junctions of the main and secondary wooden beams for frame buildings and structures. A procedure for testing specimens by loading in steps with periodic unloading has been compiled and tested on three test specimens. The tests of the approved sample of the joint were carried out, its maximum bearing capacity was established, as well as the load corresponding to the upper boundary of the elastic work area (VGOUR) of the joint. The graphs of dependencies were built: "Load - total deformation Dp", "Load - permanent deformation Dо", "Load - elastic deformation Dу", "Elastic deformation Dу - residual deformation per cycle dо". The deformations of the joint were determined within the limits of the bearing capacity of the sample, the calculated bearing capacity of the joint and the coefficient of transition from glued wood to solid wood.

Keywords: solid wood, SHERPA metal strips, test of a specimen of a joint of wooden elements, load-bearing capacity of the joint, deformability of the joint, upper limit of the elastic work area of the joint, total deformation, permanent deformation

Creep is a slow plastic (irreversible) deformation of a product under the action of stress created in the material. This article discusses the creep of polymer products. The creep of a material is characterized by the experimental dependence of the deformation resulting from a fixed load on time.

Keywords: material deformation, elastic deformation, highly elastic deformation, polymers, viscous deformation, plastic deformation

The presented article describes the modeling of a communication system (hereinafter SS) organized by a plurality of communication nodes of a public communication network (hereinafter SS SSN) and its elements. The task of modeling is to obtain interrelated initial data on the set of features for each investigated SS of the SSNS at each moment of the model time, taking into account the implemented activation processes and the logic of SS functioning. The process of functioning with the SS as a source of features is studied using a complex analytical and simulation model, since deterministic and random factors are taken into account for its development. The manifestation of signs is a complex process, since the SS is constantly in dynamics. However, the increasing intensity of the increase in the use of communication means and the load in communication channels leads to an increase in the number of manifested set of signs. The reasons for the manifestation of many signs are such factors as: dynamics of movement of the USS of the SSOP; modes of operation of SSOP elements, etc. All of these factors are used in the model as activating the manifestation of many features.

Keywords: communication system, public communication network, communication node, sign of a system element, information direction, activating factor

At present, the number of means for collecting information about the characteristics of elements of a public communication system is increasing. Databases.

Keywords: database, monitoring systems, information, resolution, processing of information arrays, similarity rate, process automation, public communication system, communication system elements

The results of theoretical research and analysis of methods that will significantly reduce the weight of the gravity oil platform are presented. At the same time, its static, dynamic, and shear stability will remain under the influence of wind, wave, ice load and current load. In order to reduce the weight and overall dimensions, it is proposed to outline the lower part of the platform base with a metal sheet pile wall. As a result of theoretical studies, the dependence of the shear force under the influence of external forces acting on the platform during operation on the physical and mechanical properties of the soil and the size of the sheet pile wall is found, which will significantly reduce the weight of the platform and the cost of its construction.

Keywords: gravity oil platform, shear stability, tongue-and-groove wall, external forces acting on the platform, rollover stability

In the oil industry, autonomous electric power sources containing renewable energy sources are used to power remote consumers with an occasional load, mainly valve assemblies on pipelines. The need for electric energy sources of this type is determined by the need to install valve assemblies at pipeline intersections with water barriers, at intersections with transport arteries, and in a number of other cases. Very often in such places there are no available power lines or substations. In this case, the only alternative is the use of autonomous sources, or the expensive construction of an extended overhead line. In some cases, the developer decides to abandon the overhead line due to its high cost and the need for additional land acquisition. From the point of view of ecology, such a decision in favor of autonomous sources of electric energy also has an additional positive effect. Since the installation of valve assemblies is dictated mainly by environmental considerations, high requirements are placed on the reliability of power supply. Violation of these conditions can lead to hydraulic shocks in the system and possible destruction and breakage of system elements. A wind turbine or solar panels are undoubtedly an independent source of power supply and, when paired with batteries or a diesel generator set, can formally provide high reliability of power supply. On the other hand, there are periods of time when the power of a wind turbine or solar battery is insufficient to supply a given load. As a consequence, the decision on the reliability of power supply should be made on the basis of additional studies of the static and dynamic stability of the entire electrical power generation complex.

Keywords: renewable energy sources, valve assembly on pipelines, ecology, static stability, dynamic stability

The main process of stratum fluid extraction in Russia is mechanized lifting. It is observed that the stock of wells equipped with electric centrifugal pumps units has grown by 50% over the past 10 years, to almost 100,000 units. Growth detected in the average time between overhauls of the oil-well stock during this period increased by 50%, to almost 800 days. Mathematical modeling becomes a tool for further improving energy efficiency and reliability. The purposes of this work is to analyze existing models of submersible electric motors and their area of operations, identify existing shortcomings and limitations, and formulate requirements for the refined model and its application potential. The results of a thermоvisional inspecting of the rotor of a submersible electric motor after long-term operation in idle mode are presented. The temperature dispersion of the rotor packages is recorded from 36.68 °C to 46.67 °C. Different packages temperatures lead to uneven changes in the active resistances of the windings, which affect the contribution of each package to the integral operating and Electromechanical characteristics of the submersible motor. For taking into account the detected effect, it is proposed to model a submersible asynchronous electric motor as an electrotechnical complex consisting of an interacting and mutually influencing set of elementary electric machines. Spatial and mathematical models are presented that take into account temperature fluctuations in individual parts of the electric motor. The results of verification of the mathematical model are presented. Its validity in the field of applicability is shown.

Keywords: electric submersible motor, ESP, rotor pack, mathematical model, thermal processes

The article is devoted about the importance and urgency of the problem of reconstruction of healthcare facilities, since hospitals, like other forms of ownership, accumulate moral and physical deterioration and need periodic repairs or full-scale reconstruction. In our country, it is not uncommon for a hospital to be a dilapidated building whose service life is coming to an end. That is why in our days the issue of full-scale reconstruction of healthcare facilities is so acute. The Ministry of Health of the Russian Federation has developed a number of measures, thanks to which, according to Rosstat, more than 10 thousand hospitals will be repaired by 2024. The authors of the article make a comprehensive assessment of maternity hospitals in Rostov-on-Don, show their layout and fertility chart. The following is an example of the reconstruction of the observational building of the MBUZ. In the conclusion, the results are summed up and the measures that need to be taken for the comfortable stay of people in the hospitals of our country are determined.

Keywords: reconstruction, healthcare, operation, buildings of medical institutions

The decentralized electric power supply zone occupies about 60-70% of the territory of the Russian Federation. Electric power supply here is carried out using electric generator sets with diesel drive engines. In combination with the difficult logistics of fuel and lubricants materials delivery, this leads to a high prime cost of electricity energy generated. In the capacity of a measures to the costs of electricity reduction, renewable energy sources are used, while maintaining diesel generation as a guaranteed supplier of electricity. Renewable energy is characterized by significant stochastic fluctuations. Based on experimental data, the article shows that the daily load curves of small settlements contain a significant stochastic component, which greatly exceeds the seasonal, daily, and technological components in amplitude. The purpose of this work is to substantiate the structure and parameters of a hybrid energy storage device (HESD) for the synthesis of electrical power generation complexes using renewable energy sources. Spectral analysis using the window Fourier transform is used as a tool. It is established that the energy approach to the choosing of HESD components requires N types of electric energy storage devices, which differ in the ratio: the permissible frequency of the charge-discharge cycle to the cost of the component. As a criterion for choosing the structure and parameter values of a hybrid energy storage device, an estimate is proposed for the levelized cost of electricity (LCOE).

Keywords: hybrid energy storage, electrotechnical complex, renewable energy, daily load curve, spectral analysis, Fourier series

This article discusses modeling of polymer corrosion in aggressive environments based on percolation theory. Within the framework of the work, an algorithm for modeling polymer corrosion was developed, and a program that implements this algorithm in C ++. Paper describes the corrosion modeling algorithm, the structure of the implemented program, and the simulation results for various parameters. The result of this work is an algorithm modeling and an application that performs modeling of the polymer corrosion process in aggressive environments based on the percolation theory according to the developed algorithm, as well as building an image of the damaged material, graphs of the dependence of the length of the boundary of the corrosion region and the area of the remaining material on the modeling step. Algorithm uses Monte-Carlo method for determing area of corrosing region and is suitable for parallel implementation.

Keywords: percolation theory, corrosion modeling, simulation of physical processes, Monte Carlo method, visualization of simulation results

The parameters of the mixers widely used in the practice of water treatment are given. A fundamentally new design of the mixing unit is proposed, which provides a process of rapid and complete mixing of reagents in a thin layer of a rotating flow of a pre-created water-air mixture using the method of concentrated coagulation. At the same time dispersion of air bubbles is carried out. A detailed description of the design, operating principle and basic design parameters of the mixer used in the mixing unit.

Keywords: natural water, coagulant, mixer, concentrated coagulation, aeration, velocity gradient, rotational motion

The paper considers the characteristics of cloud convection obtained in the course of computational experiments on the basis of a three-dimensional physical and mathematical model of convective clouds, which takes into account in detail the microphysical processes of nucleation, condensation or sublimation of water vapor, coagulation and accretion of precipitation particles, accumulation of volume electric charges, and an increase in the electric field strength. clouds due to charge separation processes occurring during the rapid freezing of large supercooled drops, accretionary growth of cereals and hailstones. Based on the data of numerical modeling using the noted model, the location in the volume of the microstructural parameters of thunderstorm clouds (water content and ice content), space charges, electric field strength, radar reflectivity in the centimeter range, and other parameters at fixed times of cloud evolution was investigated.

Keywords: convective cloud, cloud microstructure, cloud electricity, numerical three-dimensional model, radar reflectance, electrical coagulation

This article discusses the most common materials and how they are used to protect against ionizing radiation used for medical purposes. Comparison of technical and economic devices for the construction of a protective fence from the described radiation protection materials is presented. The effectiveness of the use of self-adhesive polymer radiation-shielding materials for protection against insulation with voltage up to 100 kV has been established.

Keywords: gamma radiation shielding, radiation shielding, EPDM, metal oxide, barite, polymer composites

The article describes the design of the integral micromechanical sensor of linear accelerations of the capacitive type; A construction method is briefly described using the self-assembly operation based on controlled self-organization of mechanically stressed semiconductor GaAs / InAs layers. The design of the capacitive accelerometer was modeled in the CAD system ANSYS, where static and modal analysis were performed. The results of mathematical modeling meet the requirements of modern micromechanical accelerometers, and allow them to be used for the further development of structures of this type. The obtained data can be used in particular for calculating the recommended parameters in the development of methods for designing capacitive sensors of angular velocities and linear accelerations and for developing more accurate models of MEMS structures.

Keywords: MEMS, microelectromechanical system, accelerometer, modeling, design, sensor, sensor, mathematical model