The article is devoted to the reduction of steel consumption in the compressed zone of reinforced concrete elements. Special attention is paid to the combined prestressing, in which the armature of the stretched zone is subjected to prestressing, and compressed – prestressing. The combined prestressing allows to reduce the steel consumption, and also to increase the performance of many technical characteristics by increasing the limit stresses in the high-strength reinforcement of the compressed and stretched zones

Keywords: the combined prestressing, compressed area, consumption of steel compressed fittings

A review of the serial microwave detectors of AEROFLEX company was conducted. Parameters of 116 detector models are considered. The features of AEROFLEX products are noted, including wide frequency range, high sensitivity, harsh operating conditions, a variety of design, including coaxial and strip type.

Keywords: detector, voltage sensitivity, tangential sensitivity, standing wave ratio, non-uniformity of the transfer characteristic, offset, overload protection

The article discusses the development of a mathematical model in the deterministic form of recording the main dependences that determine the process of vaporization in a steam power plant to produce heat and electricity when used as a source of biofuel energy. Theoretically, the parameters of the working process of the installation were calculated; thermal efficiency of the turbine; heat useful used in the boiler unit; the efficiency of the boiler; the percentage of heat loss with exhaust gases; the estimated hourly consumption of solid biofuel; the annual amount of heat obtained by burning the mass of crop residues; the theoretical combustion temperature of crop residues; the actual steam velocity in the Laval nozzle; the heat loss in the nozzle, etc.in the course of calculations with the help of a multi-factor experiment, the parameters and the shape of the turbine blade used in the installation were obtained. Using the presented mathematical model given in the article and the data of the Federal state statistics service, we obtain the numerical values of the working process of the installation working on biofuel. For convenience, all the summary theoretical data of the numerical values of the basic theoretical dependences of the mathematical model of the working process of the layout of the steam power plant for heat and electricity was included in the table. Thus, theoretical studies show the possibility of producing electricity of the required quality using straw to produce high-pressure steam.

Keywords: mathematical model the working process of the pressure volume, a steam turbine,producing heat and electric energy, biofuels

The article presents the results of simulation of the microstrip microwave structure of the ring configuration, which, by analogy with the fiber-optic prototype, embodies the principle of Fano resonance formation. This type of resonance is characterized by the asymmetry of the shape and has a narrower resonance than the classical Gaussian and Lorentzian forms.

Keywords: Ring resonator, Bragg reflection, Fano resonance, phase shift

In this paper, we study the frequency dependence of the inductor with a ferromagnetic core in the sound frequency range. Based on the measurements made, a replacement circuit for the coil is constructed, taking into account the active losses due to magnetic hysteresis, as well as the capacitive component of the current appearing at higher frequencies. The method of determining the parameters of the substitution scheme is given in the article, which, due to the complexity of the mathematical model, was determined by statistical averaging of the solutions of systems of nonlinear equations. Conclusions are made about the practical application of this substitution scheme in electronic devices.

Keywords: substitution scheme induction coil, frequency dependence of the impedance of the induction coil, active losses in the core

This article provides information about the state of the housing stock of the Russian Federation, provides statistical evidence, and the reasons for the current state of residential buildings and structures. The influence of modernization on the preservation and restoration of the housing stock of the Russian Federation is indicated, its expediency and main types of works are given, the results of modernization are presented

Keywords: housing stock, housing problems, modernization, operational parameter, the desirability of modernization, depreciation of the building, main types of works, replacement of equipment, add-in floors, changing the geometry of the premises

The article reports about approximation algorithm for Integer Factoriation Problem (IFP) using reduction to optimizing case of SAT problem with 3 literals per clause (MAX-3SAT). A continuous functional that equivivalent MAX-3SAT is builded and solved by simple iteration method with variable neighboordood search and Bayesian rounding. It shown that global minimum of the functional cannot be reached in almost samples because local extremums but arguments of ones can be compared with the exact solution. The experiments show that the developed gybrid algorithm improves earlier version developed by authors. Also this method is analyzed by quantum channels defense In systems of quantum key distribution. A typical structure of one is described.

Keywords: Integer Factorization Problem, an optimzed version of SAT problem (MAX-3SAT), various neighboorhood search, continuous functional of MAX-3SAT representation, quantum key distribution

The optimum coefficients for the use of materials for combined beams in a wide range of loads are obtained in the article. The principles of designing and calculating the strength of Steel Reinforced Concrete slabs are outlined in accordance with SR 266.1325800.2016 ""Steel Reinforced Concrete Structures. Design rules"". Strength calculations are performed, the results of a numerical experiment are compared and analyzed. The optimal utilization factor of materials obtained in accordance with the specified regulatory document was established. The results obtained can be used in the design of combined beams of different cross-sections and spans. The purpose of this study is to find the optimum reinforcement of the floor beams. To strengthen the proposed installation of prestressed reinforcement in the lower girdle of the beam, which increases the strength and reduces the deflections of the beams. In such ceilings, the bending moment from external loads is distributed between the structural elements: the beam and the reinforced concrete overlap, in accordance with the ratio of the stiffnesses of these components. As a result of the study, the optimal diameters of prestressed reinforcement for steel beams by spans from 6 to 9 m were determined and for the calculated linear load from 5 to 30 kN/m. The proposed reinforcement option allows to increase bearing capacity, reduce deflections, reduce labor costs for building reconstruction, and also increase the reliability and durability of the structure.

Keywords: Steel reinforced concrete, floors, combined beams, profiled sheet, coefficient of use of materials

Passive detection sensors are widely spread in engineering-technical systems of information protection. During designing such systems, it may be difficult to calculate the coverage areas of infrared detectors. This is due to the fact that the problem of establishing a relationship between the theory of statistical detection and the choice of parameters for the equation of the maximum detection range is not considered in detail. In this regard, the task was to develop a method for applying the basic equation of passive location to calculate the coverage areas of infrared detectors. The calculation method is developed on the basis of the equation of the maximum range of the passive receiver. The study considered three models of the signal-to-noise ratio: a signal against a white noise background with fully known signal-to-noise parameters; detection of a signal whose phase and amplitude are unknown; and detection of a random signal against a noise background. As a result of the research, the conditions under which the passive signal detection formulas on the background of noise give correct results were found. Thus, the connection of the statistical theory of detection with the equation of the range of the passive emitter was established.

Keywords: information security, infrared detector, passive location, engineering and technical protection, the pyroelectric element

In is paper investigated and confirmed the Deposit of bentonite clay on the studied road section of Osh-Isfana. Osh-Isfana road is an international meaning road. The road is located in the Nookatsky district of Osh region of Kyrgyz Republic and connects the two regions and gives access to the territory of neighboring States – Tajikistan and Uzbekistan. Overestimation of the roadbed with moisture is an extremely dangerous phenomenon, since the strength of the pavement and the stability of the slopes of the mounds and excavations are greatly reduced. When designing the basis of the road on collapsible soils are equally important inside the event with the aim of reducing the likelihood of soaking the soil. The recommendations on the use of local building material as a waterproofing layer of the road structure, interrupting the movement of moisture, while ensuring the removal of water from rain and snow melt.

Keywords: slope, water-heat regime, sediment, moisture, waterproofing material, X-ray spectral analysis, shale clay, bentonite clay

the development of the best available technologies, in particular, the disinfection of waste water from meat processing plants is possible in meat clusters, of which the universities are an indispensable element. Disinfection of waste water from meat-processing plants from sanitary-indicative microorganisms, pathogenic enterobacteria and helminth eggs during the electroflotocoagulation method was investigated. The effect of disinfection from E. coli, eterobacteria and salmonella averaged 99%.

Keywords: meat-processing enterprises, sewage, disinfection, electro-flotocoagulation

The problem of distribution of compensating devices of consumers between separate nodes of the power system is considered in the article. The analytical model and the algorithm for optimizing reactive power compensation are presented. Criteria of optimality of reactive power compensation are singled out. The account is taken of poorly formalized, technological factors.

Keywords: Keywords reactive power compensation, multicriteria, information uncertainty, consumer compensating devices, analytical model, optimality criteria, normalized factors

In this article the relevance of development of the wood concrete meeting the modern requirements for an ecological component and energy efficiency is considered. Features of the mechanism of structurization at hydration of the cement knitting and organic filler with use of the X-ray diffraction analysis are shown. Indicators of concentration of basic elements in the cement test without organic filler are defined and at his existence. The comparative analysis of structure of steam solution of wood concrete and structure of solution from quick-hardening cement with use of data of a rastroelektronny microscope is carried out.

Keywords: Ivashchenko Y.G., Laushkina V. A., Timokhin D.K.

The paper proposes a description of the developed optical measuring set-up for the contactless recording and processing of measurement results for small spatial (linear and angular) displacements of control surfaces based on the use of laser technologies and optical interference methods. The proposed set-up is designed to solve all the arising measurement tasks in the study of the physical and mechanical properties of new materials and in the process of diagnosing the state of structural materials by acoustic active methods of nondestructive testing. The structure of the set-up, its constituent parts are described, and the features of construction and functioning during measurements are discussed. New technical solutions for the implementation of the components of the set-up under consideration are obtained. The proposed set-up is intended for use in instrumentation, mechanical engineering, shipbuilding, aviation, energy sector, etc.

Keywords: optical measuring complex, non-contact measurements, measurements of small spatial displacements, structural materials, diagnostics of the state

The actual problems of using various reinforced concrete enclosing structures during the construction of an industrial facility are considered. A detailed comparison is made of the amount of materials required for the construction of the roof structure by overlapping the beams and the shell panel of the LCL. Based on the results of the comparison and calculations, the analysis of the results obtained and conclusions on the rational choice of the roof support structure

Keywords: prefabricated reinforced concrete structures. roofing, materials, concrete. steel, shell panels, reinforced concrete vaulted structures, prestressed reinforcement, beams