The results of a theoretical and experimental study of the synthesis of GaInAsBi thin-film structures formed on InAs substrates in the field of a temperature gradient are discussed. The features of interfacial interaction in the In-As-Sb system in the presence of isovalent solvents (In, Bi) have been studied. The values ​​of the interaction parameters and the distribution coefficients of the system components are determined. Optimal technological modes for obtaining InAs-based heterostructures are presented. The properties of the surface of epitaxial layers are studied experimentally. It was found that the main control parameters are the temperature of thermomigration and its gradient. It is shown that the synthesized semiconductor materials can be effectively used in electronic devices of a new generation - electro-optical modulators and supersensitive sensor elements.

Keywords: epitaxial structure, crystallization, recrystallization, melt, segregation coefficient, organometallic compound, voltage sensitivity, near infrared range, solid solution, optical characteristic

The physicochemical properties of cobalt catalysts on a NaX zeolite support have been studied. The parameters of the specific surface area, reduction of deposited cobalt, and structural properties of the active component of catalytic systems have been determined. To establish these properties, the methods of BET, TPR, TPD-H2, IR spectroscopy were used. It is shown that the preparation procedure has a significant effect on the physicochemical characteristics of the samples.

Keywords: catalysts, cobalt, zeolite, dispersion, specific surface area of the active component

This article discusses the approach being developed, the option of life cycle formation using the example of underground structure. The most recent life cycle model used in foreign countries is considered. And based on this model, the developed scheme of the life cycle model of the underground structure is presented.

Keywords: Life cycle, BIM, TIM, underground facilities, modeling, information construction, redevelopment, monitoring, GIS

The results of the development of compositions of fibroconcrete floor coverings and the technology of their preparation for use in structures during the construction of industrial and civil structures are presented. The effectiveness of the use of polymer and basalt fiber fibers, as well as plasticizing additives in the manufacture of fine-grained fiber concrete is substantiated. As a result of the conducted experiments, the composition of fine-grained fiber concrete with the use of basalt fibers as fillers is proposed. Based on the calculation of the estimated cost, it was found that the use of fiber fibers in the concrete mixture instead of laying metal mesh allowed to reduce labor costs by about 2 times, reduce the amount of binder, and also improve the performance characteristics of floor coverings by increasing crack resistance and corrosion resistance.

Keywords: floor coverings, fiber-concrete mixture, superplasticizer, basalt fiber, strength

The purpose of the article is to study the material on the topic "Basalt fiber", to generalize the studied material and the accumulated experience on the given topic. The article discusses the advantages, disadvantages, problems of use and achievements in the study of basalt fiber used for the production of building materials as a reinforcing component. The analysis of the average cost of basalt fiber in comparison with other types of fiber is carried out, a conclusion is made about the advantage of using basalt fiber. General conclusions have been made about the advisability of using basalt fiber for the production of building materials, and unexplored areas of using this type of fiber have been identified.

Keywords: basalt fiber, reinforcement, stress-strain states, compression, tension, bending, shear, deformation, adhesion

This article discusses one of the parts of the development of a device for testing samples of magnetostrictive materials. A study of various designs and an analysis of the sensitivity of the measuring system are presented. The substantiation of the use of a magnetic shunt to increase the sensitivity is given, which is confirmed in field experiments.

Keywords: magnetostrictive materials, basic magnetization curve, magnetic shunt, magnetic flux

The existing methods of quality control of work in construction are considered, the main purpose of their implementation is formulated. A list of the main signs and properties has been determined for which it is recommended to exercise control. The main methods of control in practice are listed on the example of a nine-story residential building. New ways to improve quality control in the production of works are proposed.

Keywords: control, quality, construction, normative document, defect, damage, tool, BIM, information modeling

The article discusses the problems and key points in the construction foundations of transport structures. The ways of solving the problems that arise during construction, as well as methods of quality control of materials and technological processes are proposed. The technical aspects of the construction of the armoured frame foundations are analyzed.

Keywords: foundation, construction, transport structure, bridge, road, analysis, quality control, concrete, armature, construction, material

In recent years, municipal solid waste management in developed countries has been based on the principle of recycling and reusing secondary products. The overseas level of sorting and disposal of waste is higher and more detailed, it refers to a higher economic level, cultural level of quality of life, government investment, appropriate policies and the construction of related auxiliary facilities. This article discusses some of the systems and methods for sorting municipal solid waste in order to justify the need to develop a system for object recognition when sorting waste.

Keywords: municipal solid waste, waste sorting problems, waste preparation for sorting, technologies for automatic waste sorting

More than 42 thousand bridges on highways are operated in Russia. Most of the bridge park was built in the past years. Bridges are getting old, accumulating destruction and defects and gradually cease to meet the requirements for safety, durability and load capacity imposed on them. It is necessary to spend a lot of effort and money on maintaining a stable working condition of all operated bridges. The use of modern surveillance tools will save financial and time resources. Such means of monitoring and collecting information can be unmanned aerial vehicles: various types and designs of quadrocopters and drones. A quadrocopter inspection of one of the city's overpasses showed high efficiency and quality of the information received. Based on the data obtained, it is possible to judge the technical condition of the object. Of course, the particularly dangerous defects identified during the inspection should subsequently be examined by a specialist to make a final decision. The article presents the photographic materials obtained by the modern method of data collection, the advantages of using quadrocopters in the survey of bridges and the technical characteristics of the equipment.

Keywords: operation of structures, inspection, bridge structures, quadrocopters, drones, defects, destruction,bridge bed

The most common fittings in gas networks are investigated, such as bends with different angles of change in flow direction and equal tees. The dependences of the values of the coefficients of local resistance depending on the gas flow rate, diameter, angle of rotation and material of the product are determined. Recommendations are given for determining the coefficient of local resistance of the studied fittings.

Keywords: gas pipeline, hydraulic calculation, pressure loss, coefficient of local resistance, gas consumption, geometrical parameters

The work is devoted to some questions of prosthetics of human limbs. A prototype of a prosthesis control system based on electromyography is suggested, which is not inferior to existing analogues, but significantly benefits in its cost.

Keywords: bionic prosthesis, electromyography, EMG sensor, amplifier

The paper considers the dynamics of drought periods based on meteorological data for a multi-year period. The research area covers the basins of the Sokolovsky reservoir and the Taganrog Bay. In the course of the study, the following tasks were performed: climatograms were constructed, a correlation analysis of the course of the total amount of precipitation and the course of average annual temperatures was performed, the deviation of air temperatures from the climatic norm for the considered areas was revealed. The tendency to increase the dry period in the Rostov region from north to south has been revealed, which may have an adverse effect on the hydrological regime of water bodies.

Keywords: dry period, Sokolov reservoir, Taganrog Bay, Rostov region, drought, climate, climate data, precipitation, air temperature

the presented work is devoted to the study of the temperature state of a fuel element (fuel element) – a cylindrical solid body with an internal heat source of constant power. Using the integral method of heat balance with the introduction of an additional desired function, an approximate analytical solution of the corresponding boundary value problem of thermal conductivity is obtained. The conditions of external heat transfer at the boundary of the studied region were set according to the Newton-Richman law (a boundary condition of the third kind). When obtaining the solution, trigonometric coordinate functions were used. Their use made it possible to reduce the number of terms in the desired solution due to the a priori fulfillment of the boundary condition in the center of the fuel element. It is shown that when using only three terms in the analytical solution (the first approximation), an accuracy sufficient for engineering applications is achieved. The error of the developed method was estimated by comparing the results obtained with a numerical solution based on the finite difference method. The article presents graphs of the temperature distribution at different power values of volumetric fuel element heat sources. The developed method can be used to determine the time of the system's exit to the stationary mode, estimate the maximum fuel element temperature at various values of the dimensionless Bio and Pomerantsev numbers, and determine temperature stresses.

Keywords: internal heat sources, boundary conditions of the third kind, additional desired function, heat balance integral, heat-generating element, approximate analytical solution, numerical solution, heat conduction problem, Bio number, Pomerantsev number

In modern construction, there are a large number of construction production risks that have a negative impact on the construction of buildings and structures. To reduce adverse impacts on the construction process, it is necessary to constantly monitor these risks. The reasons for the risks of construction production and the ways of their solution are presented in the article. The problem of construction production risks is very significant, given the high rate of construction of buildings and structures using new innovative processes and methods. At the same time, any risk can be avoided or minimized by a high-quality, responsible approach to the performance of their work, with the help of regular control, management and monitoring of all construction risks.

Keywords: construction, risk, consequence, reason, decision, result, construction company, construction process, project, negative impact, building, structure