Objectives The aim of the study is to develop a model of a portable thermoelectric generator (TEG), designed to operate at low ambient temperatures, the study of thermophysical processes occurring during its operation.

Method A thermal model of TEG for the conditions of the Far North was created, in which five main blocks are distinguished: a heat source (human), heat accumulators, TEG implemented by a certain number of thermoelectric batteries (TEB) connected in series, heat pipes and a radiator system for intensifying heat transfer cold junctions of thermopile elements with the environment, on the border of which there are boundary conditions of the 2nd and 3rd kind. Based on the thermal model, a mathematical model of the device has been developed, which includes solving the problems of calculating the heat conduction, melting and solidification of the working substance in a heat accumulator; an electric energy generator based on a thermoelectric converter.

Result The dependency graphs are obtained, reflecting the main characteristics of the developed system, in particular, the dependence of the change in the emf on the temperature difference between the TEG junctions at various coefficients of heat exchange with the environment, efficiency TEG from thermo-emf.

Conclusion As follows from the obtained data, the value of the generated emf directly related to the temperature difference between the TEG junctions, and the higher the value of the latter, the higher the emf value The direct dependence of the emf is also evident. and values of heat transfer coefficients with the environment. From the graphs presented, we can conclude that to obtain a larger value of the generated emf it is necessary to select a heat accumulator with the highest possible temperature and heat of fusion. C.p.d. generator decreases with increasing generated emf Under the conditions of a numerical experiment, the maximum value of the efficiency amounted to slightly less than 8%. It is advisable to use heat pipes as heat conduits because of the minimum heat loss along their length, and crystalline sodium sulfate, crystalline sodium carbonate, and paraffin as heat accumulators. 

Objectives Investigate the prospect of improving the quality of centrifugal pumps in oil production.

Method The method is based on energy-efficient installations for high-yield wells - the steps of the Borets-Weatherford installations and the Borets PC stages.

Result The main hydraulic characteristics of electric centrifugal pumps with the use of energy-efficient stages with the recommended feed range have been developed. The dependence of the maximum efficiency on the applied steps of the above installations has been determined. A comparative analysis of energy-efficient and commercially available installation of electric centrifugal pumps is given. The dependence of the parameters of the installation steps on the flow, head, number of stages, nominal speed and efficiency of the pump is given.

Conclusion When using submersible pumps of the 10ECNM type in oil fields, increased reliability and durability were noted, in contrast to the use of submersible ECNM-type pumps. With the help of energy efficiency programs for oil production, implemented by oil companies, by ensuring more efficient operation of pumping equipment, power consumption has been reduced. The adoption of promising solutions to improve the energy efficiency of ESP systems is a priority. The use of energy-efficient ESP systems for the operation of high-rate and low-rate wells allows to ensure maximum efficiency of the submersible equipment and reduce the specific electricity consumption. In a comparative analysis of the characteristics of pumps with a daily flow of 400 m3, the use of an energyefficient installation ESP 400–2200 with FEA provides three times lower energy costs. A comparative analysis of the energy efficiency of the presented pumps shows that the use of energy-efficient installations of electric centrifugal pumps produced by PC Borets LLC will reduce energy costs by an average of 30%. 

Objectives The task was to obtain a model for determining the maximum possible degree of filling the circular section channels in the earthen channel based on the condition of ensuring the stability of slopes and the minimum volume of excavation during their construction, as well as finding the optimum degree of filling fortified channels of a closed profile corresponding to maximum throughput.

Method In work analytical methods of differential calculus and the solution of implicit equations are used.

Result The experience of domestic and foreign researchers was taken into account to solve the set tasks, select research methods and criteria for optimizing channel parameters. Two cases of circular-shaped channels are considered: 1) in the earth channel, 2) reinforced with a closed transverse profile. For the case of a hydraulically most advantageous circular channel in the earthchannel channel, equating the first derivative of the equation of a circle with the reciprocal of the allowable embedding coefficient of the slopes obtained an analytical solution for determining the maximum degree of filling from the slope stability condition, which was not dependent on hydraulic flow elements. In the case of non-cohesive soils that form the channel, the circular channel can be filled to a depth not exceeding 20 percent of the channel radius. At the same time, the average flow rate should remain in the range from non-venting to non-blurring. In order to be able to determine the flow rate, analytical expressions are given for finding hydraulic flow elements in a circular channel. When determining the volume of excavation for the construction of the channel, the excess of the channel edge above the maximum water level in the channel was taken into account. For the case of a fortified channel of a closed transverse profile, by taking the derivatives from the Chezy formula, we obtained the optimal values of flow rate and average velocity.

Conclusion A fortified closed circular profile channel has a maximum capacity with a relative degree of filling of 0.938, and the maximum average velocity of a fluid in a pressureless channel is achieved with a degree of filling of 0.815. To determine the maximum permissible relative degree of filling in the case of a circular section channel in the earthen channel, analytical dependences were obtained, before using which, according to the reference literature, it is necessary to take the value of the slope coefficient for this type of channel bed soil. 

Objectives Traditional methods for solving the problem of protecting the information resource of electronic document management systems based on protective basic functions (identification, authentication and verification of users, etc.) of available tools and information security subsystems have a significant drawback - inefficiency when an attacker masters the password of regular users. In order to eliminate it, it is necessary to develop new methods related to managing the weakly vulnerable process of delimiting user access not only to confidential information, but also to the software of the electronic document management system.

Method One way to solve this problem is to use the modified “soft administration” method, which consists in automatically generating lists of allowed source files in the authorization matrix by reducing the lists and comparing file integrity functions with a reference list for an existing software package. This allows you to automate the process of developing access control rules and provide management of the weakly vulnerable process of access control to software tools of the electronic document management system.

Result A verbal model is developed for automated control of a weakly vulnerable process of differentiating access to software tools of an electronic document management system, and a system of performance indicators for the functioning of a promising subsystem for protecting confidential information characterizing it as a control object is proposed.

Conclusion The presented verbal model provides for the possibility of distributed control, in which the security administrator directly controls the specified process using a remote software tool. The formation (change) of the authority establishment matrix for managing a weakly vulnerable process of access control using a promising subsystem for protecting confidential information and the development of a system of indicators to comprehensively evaluate the effectiveness of its functioning is one of the most important tasks of protecting information from unauthorized access, guaranteeing the implementation of a security policy throughout the entire operation period secure electronic document management system. 

Objectives The aim of the work is the use of various models for optimizing the production of agricultural products for management using empirical data and expert estimates.

Method It is proposed to use individual or group averaged and interval values of production and economic parameters as expert estimates for the above linear programming problems under uncertainty. The use of averaged or interval expert evaluations is associated with the features of applied extreme problems and providing models with initial data.

Result Models are proposed for optimizing the production of agricultural products and harvesting wild food resources, for the implementation of which it is necessary to use expert estimates that supplement empirical data. The first task of optimizing the crop structure used interval values of the coefficients proposed by experts that characterize the timeliness of implementation technological operations. In the second task related to the planning of procurement of wild-growing products, interval expert estimates reflect fluctuations in the yield of wild plants, labor costs, and cost indicators of production. In the third task, an individual expert assessment of the effect of pollution on annual, perennial grasses and crops was used.

Conclusion Optimization tasks for agricultural production, taking into account expert assessments, have been implemented for two agricultural enterprises in the Irkutsk region and the Bratsk region, which has significant reserves of wild food resources. 

Objectives The purpose of the study is to obtain an expression for determining the coordinates of the earthquake focus using the ellipsoid method, as well as testing the possibility of using the method using the figures of the second order of the ellipsoid during the initial determination of the coordinates of the earthquake hypocenter.

Method A comparative analysis of the probability density of errors in the hypocentral zone of the earth's surface, in combination with various spheres, ellipsoid and hyperboloid and ellipsoids, is carried out.

Result Obtained an expression for determining the coordinates of the earthquake focus by the method of ellipsoids, as well as the density of the distribution of error probabilities in the determination of the earthquake hypocenter the in calculations by the method of spheres, by the combined method of spheres, hyperboloid and ellipsoid, and also by the method of ellipsoids.

Conclusion Methods used to determine the coordinates of the hypocenter ellipsoid, have large errors in comparison with the method of areas. This can explained by the fact that in determining the coordinates of the hypocenter in the sphere method, three errors are used in determining the difference in the travel times of seismic waves, while in the ellipsoid method and the combined method of the sphere of the ellipsoid and hyperboloid have four errors, which introduces final errors in the distribution. All the obtained dependences of the error distribution have the form close to the Cauchy distribution. 

Objectives The article presents a formal model of information security in mobile devices running the Android operating system, an example of detection and investigation of malicious software, as well as static and dynamic analysis of malicious software.

Method To protect sensitive information on mobile devices, you can use software and organizational measures at the same time.

Result The proposed formal model of information security and analysis of suspected malicious software will ensure the security of information in mobile devices, as well as reduce the risk of threats to an acceptable level at a minimum cost of the protection system. The presented algorithm of the application designed for illegal transfer of funds, as well as an example of the analysis of this application will allow the specialist to improve the quality of their professional tasks in the analysis of incidents in the field of information security.

Conclusion Due to the fact that today there is no scientifically based method of detection and analysis of malicious software in the memory of mobile devices, the information provided in this article will help to improve the efficiency of information protection in mobile devices running the Android operating system. 

Objectives Definition of general principles for constructing indexing systems for elements of finite sets.

Method. Building a model of the indexing process. Definition of general rules for assigning attributes - indices to elements of sets.

Result. The general principle of constructing indexing systems for elements of sets and their aggregates is proposed. The basis of the proposed indexing principle is the mandatory presence of functional relationships between the values of the element indices. The main sign of differences in indexing systems is the difference in functional dependencies between the values of the indices of the environment elements. Indexing systems determine the structural properties of sets and their aggregates. A change in indexing systems predetermines a change in structure. This allows one to form sets, sets with different structures from elements of the initial configurations, and change their structural properties.

Conclusion. A general principle is proposed for constructing systems for indexing elements of sets and their aggregates, based on which are functional dependencies between element indices. Changes in the used functional dependencies between the element indices, as shown in the work, allows one to form combinatorial configurations with different structural properties. The indexing system is a set of rules for assigning to the elements sets of attributes - indices, ensuring their visibility and communication with the environment and determining their structural properties. At the heart of the construction of any structures and indexing systems are some common basic principles for their construction. They are illustrated based on the indexing systems used in classical algebra. Based on the results of a study of the principles of constructing indexing systems, a generalized model of indexing systems is proposed. As a general principle, which is a general principle of constructing indexing systems, a system of functional dependencies between the values of the indices of an element of sets and the values of the indices of the elements of its environment is proposed as a model. 

Objectives The aim of the study is to simulate assembly and installation work when creating equipment for nuclear power plants based on radio electronics

Method The study is based on methods of mathematical modeling of technological processes.

Result This work is the structuring of knowledge on the assembly and installation of electronic equipment for nuclear power plants. Known methods for the production of printed circuit boards are described. Since the application of solder paste is one of the most responsible technological methods, to minimize the occurrence of defective prints, it is necessary to precisely select the components and make the appropriate chemical composition. For the model of the “Entry-Exit” system, the parameters of the input and disturbing array are shown.

Conclusion Taking into account the parametric dependences and the effect of fatigue during sequential operation, an equation is obtained that allows, as a first approximation, to normalize assembly and installation works. Mounted mounting is not taken into account in the equation, as This process is more rational to carry out during the direct assembly of equipment or its components. 

Objectives Improving the model of movement of solid particles in natural turbulent flows.

Method The improvement of knowledge about the structure of water flows and the nature of channel processes has led to the development of views on sediment movement as a stochastic process due to the random nature of the factors causing it: natural-climatic and hydrological conditions, variability of the physical and mechanical properties of soils, and turbulence of water streams. In this regard, the methods of probability theory and the theory of random processes were used to construct the model of sediment movement.

Result Based on the studies, a mathematical model of the reformation of natural channels was established by an unsteady flow, which provides a more complete, in comparison with existing domestic and foreign counterparts, consideration of factors affecting the flow of channel-forming sediments. The analysis of mathematical models of the movement of solid particles in the water stream showed that the physical nature of the transport of channel-forming sediments is more consistent with the model based on the parameters of the trajectories of solid particles, namely, lengths, heights and transport time (jumps) of bottom and suspended sediments and their concentration in the stream. Such a model is implemented by integrating averaged equations and vortex formations using a mathematical apparatus.

Conclusion The calculated model of the movement of solid particles is implemented in the algorithmic language Fortran Power Station and tested on the basis of field and experimental studies in a wide range of hydraulic flow characteristics and physical and mechanical characteristics of channel soils. 

Objectives It was proposed to review the structure of the fire and rescue divisions management system, based on the decomposition of the forces and means of the subdivisions into fire extinguishing positions and ensuring fire extinguishing actions.

Method The structural and functional model of the development of the fire and rescue divisions management system has been clarified, which allows to present the stages of the development of the system as components of a single fire extinguishing process. The reasons for the lack of information about the situation at the site of a fire in a person who makes management decisions regarding the forces and means of fire and rescue units are given.

Result The analysis of information about the situation at the place of fire consumed by the person making management decisions. The structure of the database of the object of possible fire as a source of design parameters for the system of information and analytical support for the management of fire and rescue units is given. The structure of the settlement module of the system of information and analytical support for the management of fire and rescue units in the organization of extinguishing fires in buildings is proposed. The conditions for the interaction of the person making management decisions in relation to the forces and means of fire and rescue divisions with the software of management support systems and documents of preliminary planning of actions of the divisions for fighting fires and conducting rescue operations are given.

Conclusion The software implementation of the models of information and analytical support systems for the management of fire and rescue units makes it possible to formalize the process of researching the fires that have occurred. The direction of perspective integration of models of information and analytical systems support systems for fire and rescue units in their activities is given. 

Objectives The aim of the study is to develop a model for assessing the reliability of frame systems, taking into account the redistribution of forces between vertical structures when plastic hinges are formed in them from horizontal seismic effects.

Method The research method is based on the analysis of the schemes of mechanisms for the transition of frame systems to limit states, as well as probability theory, random processes and system reliability.

Results Based on the analysis of the paths of transition of statically indefinable frame systems to failure states due to the formation of plastic hinges at the junction points of the posts with crossbars, a block diagram of the system elements connection has been developed, presented as a separate redundancy scheme. The expressions for estimating the probabilities of switching off the conditional elements in the computational model and transitions of the system, both to the backup and to the failure states are presented. Expressions are proposed for assessing the survivability of frame systems with a decrease in static indeterminacy due to the formation of plastic hinges in structures. The calculation example is given.

Conclusion The proposed model for assessing reliability allows, in contrast to the parametric model, to evaluate the reliability of structures with regard to the redistribution of effort in structures with damage accumulated in racks in the form of plastic hinges, and to identify reliability reserves embedded in statically indeterminable systems under strong seismic effects. 

Objectives This article discusses the evaluation of the effectiveness of three-layer pipes of a symmetric and asymmetric structure. For this, the stress-strain state of three-layer pipes of different materials under the influence of internal pressure is investigated. Pipeline structures today occupy important positions in the infrastructures of many countries. Trunk structures affect the economy, industry. Every year, new safety requirements are added to the reliability indicators of these structures.

Method The calculation is carried out by numerical methods, namely using the finite element method (FEM), implemented in the LIRA PC.

Result The calculation of the pipes is performed, on the load from the transported medium, applied to the inner contour of the pipe. Moreover, for three-layer pipes of all variants, Nx tensile stresses along the generatrix, Ny ring tensile stresses and Txy shear stresses in the xy plane were determined. Isopoles of tensile and shear stresses are given.

Conclusion The numerical results showed that the use of less deforming material as a material for the manufacture of asymmetric bearing layers leads to a redistribution of stresses in the bearing layers and aggregate, and this must be taken into account when designing three-layer pipes.

Objectives Development of optimal recipes of concrete mixtures using local natural raw materials in the form of gravel-sand mixtures from deposits of the Chechen Republic.

Method The research methods adopted in the work are based on the theoretical principles and laws of designing and optimizing polydisperse multicomponent systems, the phase and structure formation of clinker minerals, the logic of mathematical calculations, the technological features of the structure formation of composite masses, the theoretical principles of controlling the rheological processes of mixes. All experimental data presented in the work were obtained according to the methods of current regulatory documents (GOST, recommendations, etc.).

Result The paper presents the results of a study of the composition and properties of sand and gravel mixtures of deposits of the Chechen Republic and concretes based on them. In particular, the granulometric and chemical compositions and the physicomechanical properties of sand and gravel mixtures have been studied. An analysis of the scientific literature and experience in the use of sand and gravel in construction. The leading scientific schools of the country and abroad in the field of concrete science are presented. The rheological indices of concrete mixes were studied and the dynamics of the curing of concrete of different classes were obtained on the basis of unfortified sand and gravel mixtures in the presence of a chemical additive, the superplasticizer Polyplast SP-1.

Conclusion It is proposed to use sand-gravel in its natural form in concrete for non-critical structures in its natural form without additional costs for enriching its composition. The feasibility of obtaining low-grade concrete with the use of sand and gravel mixtures without its enrichment and fractionation is established. 

Objectives In the process of firing Portland cement clinker in electrostatic precipitators, in rotary kilns, a large amount of harmful substances, both clinker and aspiration, accumulates, therefore rational use of these products leads to certain shares of a full-fledged river resource, which are derived from industrial cement. It should be noted that the reuse of dust electrostatic precipitators is impossible.

Method The basis for obtaining durable and more resource-efficient composites is based on modern technological methods that contribute to the improvement of technical and physicomechanical properties, with the integrated application of technogenic raw materials and liquid sodium binder.

Result The basis for obtaining durable and more resource-efficient composites is based on modern technological methods that contribute to the improvement of technical and physicomechanical properties, with the integrated application of technogenic raw materials and liquid sodium binder.

Conclusion The developed clinker-free binder formulations using the cement industry wastes and sodium-based sludge glass will make it possible to produce less expensive, durable, and durable composites that will partially replace traditional concrete with expensive portland cement. 

Objectives The aim of the study is to study the effect of vacuum treatment, heating temperature, mixing time and load force on the strength of heat-resistant expanded clay concrete for lining thermal units.

Method The study is based on the vacuum processing technology of heat-resistant concrete based on a composite binder for lining the hearth of a trolley of a brick kiln, vacuum-packed concrete mix.

Result The effect of vacuum processing of the mixture on the technological properties of heat-resistant expanded clay concrete on a composite binder made from Portland cement and finely ground expanded clay activated in a planetary mill (Activator-4M) is investigated. Compositions have been developed and the technological properties of expanded clay concrete have been investigated depending on the heating temperature and the amount of finely ground additives.

Conclusion The results of the analysis of the dependence of the strength of expanded clay concrete on the heating temperature, the mixing time and the load strength confirm that the concrete strength indicators during evacuation are higher than for concrete without vacuum treatment; the increase in concrete strength after vacuum treatment under various technological exposure conditions is explained by an increase in workability indicators, which is characterized by the mobility and stiffness of the concrete mixture, denser packing of aggregate in the concrete structure, and also the large effect of vacuum compaction associated with the suction of water and air as well as static sealing due to the difference in atmospheric pressure and vacuum cavity pressure. The magnitude of the effective force reaches 70-75 kN / m2 with the removal of water and air from the vacuum surface; the pressure transmitted to the concrete is reduced, since part of the load is spent on determining the forces of internal friction and the development of contact stresses in the solid phase. 

Objectives Reliability and durability of structures using materials with various properties (plaster coatings, cement glue, new concrete during repair and restoration of structures, etc.) largely depends on the adhesion of the layers and the deformation properties of the coatings. To obtain the required properties of materials used for coatings, modifiers based on polymers and low-modulus inclusions are introduced into the composition of new concretes, for example, entrained air. The aim of the work is to identify some patterns of change in the properties of concrete with the joint introduction of these modifiers.

Method Experimental determination of the tensile strength in bending, compression, E-modulus, adhesion to the concrete base by standard methods.

Result The influence of separate and joint introduction of dispersible polymer powders and various low-modulus inclusions into the composition of fine-grained concrete has been established.

Conclusion The joint introduction to the composition of fine-grained concrete of various low-modulus inclusions and redispersible polymer powders provides a reduction in the stress level during forced deformations due to the different effects additives on the strength and deformation properties and contributes to increased adhesion to the concrete. 

Objectives The emergence of modern high-strength materials leads to the creation of thin-walled structures in various fields of technology. To obtain the necessary information about their behavior under load, one should analyze all the characteristic features encountered at all stages of their loading - at the initial (initial) stage of their operation, taking into account one or more types of nonlinearities, find possible critical states and, depending on the type of stability loss, study the nature of the initial stage of postcritical deformation. Based on an algorithm combining approximate analytical and numerical methods, the article solves the model problem — studying the behavior of a thin-walled spherical shell under load.

Method. The study is based on solving the nonlinear problem of determining the stress-strain state at the initial - axisymmetric stage of work; critical (bifurcation) load values; analysis of the nature of post-bifurcation behavior. The work uses a variant of the general theory of stability and postcritical behavior of structures previously developed by V.T. Coiter.

Result. The solution of such a general problem associated with discontinuous phenomena is carried out on the basis of mathematical ideas formulated in the theory of branching solutions of nonlinear equations. The values of the coefficients characterizing the initial stage of the post-bifurcation behavior of the shells and, from a practical point of view, the relations between the critical and limiting values of the loads are obtained. It is shown that depending on the area of the shell surface part loaded by the distributed load, the nature of the initial stage of postcritical deformation changes not only quantitatively, but also qualitatively.

Conclusion. The most effective in solving problems associated with discontinuous phenomena are combinations of approximate analytical ones - catastrophe theory and numerical methods that do not require complex, timeconsuming and significant amounts of computation. Analysis of the initial stage of the postbifurcation behavior of structures allows us to assess the degree of danger of reaching a critical state, which is achieved by taking into account the values of the corresponding reliability coefficients in the calculations.