bluuebunny/crossref_metadata_2025 huggingface dataset:
Contemporary heterostructures for solar cells improvement
Authors: Lebedev A , Naumova A , Zhalnin B , Vagapova N , Slyschenko E , Sharov S , Obrucheva E , Didenko S , Izotov A
Published: May 2021

Current investigation is focused on InxGa1-xP and InxAl1-xP epitaxial layers growth. Multicomponent nanoheterostructures are the main materials for a contemporary triple-cascade solar cell, and for perspective photovoltaic devices. The optimal InxGa1-xP and InxAl1-xP growth process characteristics are determined. InxGa1-xP epitaxial layers (with In & Ga varied on Ge), and InxAl1-xP layers (with Al & In varied on Ge and GaAs) are investigated. During investigation X-ray diffractometry was used. Based on results of X-ray diffractometry the lattice parameter and In / Ga / Al ratio in the structure were detected. Solid phase versus the gas phase composition correlation was found based on the lattice parameters. It is determined that diffraction X-ray peaks broadening can be used as a parameter for the heterostructure perfection analyze. For the InxGa1-xP solid solution (X = 45–53 %) and for InxAl1-xP solid solution (X = 46-51 %) a high quality of the single-crystal structure and a slight diffraction X-ray peaks broadening are detected.
Simulation of laser cladding of a wear-resistant coating hardened with Al2O3 particles
Authors: Alisin V V , Roshchin M N
Published: May 2021

The article is concerned with the matters of formation of heat fluxes during laser fusion of coating of the NiCrBSi system hardened with the addition of aluminum oxide fine powder. It is based on the simulation of the process of heating and melting of the CW coating with a laser and the specified thermophysical properties of the base material, coating and hardening additive of aluminum oxide powder. The numerical solution of the differential equations system is obtained and the temperature distribution in the coating over the thickness is determined depending on the power and time of action of the heat source. The obtained diagrams are analyzed, on the basis of which it is proposed to choose the parameters of laser processing. The prospects of applying a coating using the laser cladding technology to protect against wear of steel friction surfaces and restore hardened steel parts of friction assemblies are shown.
On the task of designing an object of cyber-physical quality control system for asphalt mixtures compaction
Authors: Prokopev A P , Nabizhanov Zh I , Emelyanov R T , Sabinin V L
Published: May 2021

The results of formulation of computer model of highly-efficient constant nondestructive testing of quality compaction by state method have been considered. Computer model has regard to structural components of work tool and sealing material. The model of the sealing material is represented by a visco-elastic Kelvin-Voigt body. Result parameters are meant to analyse process dynamics, determine compaction quality continually, automate operation and control. A simulation model of the considered process was obtained in the language of the MATLAB/Simulink. Results of simulation of numerical example were provided.
Model of object non-destructive technology of road surfaces compaction control
Authors: Prokopev A P , Nabizhanov Zh I , Emelyanov R T , Ivanchura V I
Published: May 2021

The results of research on the development of a mathematical model of the object of non-destructive technology for continuous monitoring of compaction of road construction materials are considered. The dynamic model is based on the process of compacting the material with a double drum vibratory road roller, as an element of a cyberphysical road construction system. The main stages of constructing a mathematical model using the state variables method are presented. The state variables are vertical displacement and velocity of the rollers, vertical displacement, velocity and angular displacement of the roller frame. The results of developing a simulation model of a dynamic system implemented in the language of the Simulink program based on a model-oriented approach are presented. Output signals of the dynamic model – displacement, velocity, speeding-up, contact force of the roller drums. A mathematical model of a viscoelastic body is used to describe the dynamics of the compacted material. The results of modelling a numerical example of the dynamical system under study are considered.
Analysis of the features of image processing using the Hamming network on the STM-32 microcontroller
Authors: Chepkov A O , Klimachev V S , Korchagin A I , Vlasov A I
Published: May 2021

The paper discusses the features of solving a class of problems for pattern recognition using the STM-32 microcontroller. The problem of pattern recognition can be solved on neural networks of different architectures, the main attention is paid to the Hamming neural network model. The features of the implementation of the Hamming network based on the STM-32 microcontroller for the recognition of images entered via the touch screen are analyzed. It is experimentally shown that the network cannot always correctly process the input value and compare it with the reference value of the class for digital test images. This is due to the high degree of similarity of some images and the presence of noise. In conclusion, recommendations on the implementation of neural network algorithms for image processing on microcontrollers are given.
Prevention of salt deposition in circulating water by the combined use of a salt deposition inhibitor and magnetohydrodynamic treatment
Authors: Laptev A B , Golubev A V , Kireev D M , Kozlov I A , Slavin A V
Published: May 2021

The article considers the possibility of using magnetohydrodynamic water treatment together with high-molecular polycarboxylates. The principle of calculating MHDT devices for increasing the efficiency of a polycarboxylate-based reagent is proposed. It is shown that the method of increasing the efficiency of a polycarboxylate-based salt deposition inhibitor in cooling water systems simultaneously with the use of magnetohydrodynamic treatment of circulating water allows reducing the reagent consumption, avoiding the use of nitrates and phosphates, and reducing technological costs. The effectiveness of the combined use of a polycarboxylate-based salt deposition inhibitor with the MHDT device has been confirmed by tests on the cooling water system equipment of an industrial enterprise. When testing the reduction of salt deposits with a polycarboxylate-based salt deposition inhibitor and MHDT, the inhibitor dosage was reduced from 5 to 1 ppm. Monitoring the efficiency of the heat exchanger (by temperature difference) showed that there were no deposits on the plates for three months. The number of heat exchanger repairs has been reduced by more than three times.
Separation process control system in the cement production facility
Authors: Muravyova E A , Gabitov R F , Sabanov P A
Published: May 2021

The article developed a system for controlling the process of cement separation using neural networks. The control object is a separator. The task is to improve the cement production process control system by installing a frequency converter and an electric air damper. In order for the current frequency and the degree of opening of the damper to be set automatically, a neural network was developed for the separation process, which has two input and two output parameters. The neural network is able to adjust the rotor speed of the separator, relying on sensors that control the speed of the separator rotor and the size of the cement particles. If the speed of rotation of the rotor of the separator becomes low, artificial intelligence will adjust the fineness of grinding, changing the degree of opening of the damper for air supply to the separator. If the speed of rotation of the separator rotor approaches the maximum, and the grinding fineness has not reached the specified values, then the grinding fineness is controlled by changing the degree of opening of the damper for air supply to the separator.
The influence of a TM wave on liquid flow in a capillary
Authors: Kharlanova T S , Kharlanov A V
Published: May 2021

Electromagnetic wave propagation along capillary with flowing liquid is considered. It is shown that there are frequencies at which the electromagnetic wave has a longitudinal component of the electric field hitting the double electric layer and causing an increase in the liquid flow rate caused by vibration effects. The increase of the velocity is related to the decrease of the adhesion force of the liquid to the inner wall of the capillary. It is shown that if vibration is switched on, the outer layer of liquid starts to move with some speed, hence the flow rate of liquid will increase. The vibration is caused by electric component of electromagnetic wave. Calculations have shown that the considered effect should also be observed at low intensities of electromagnetic wave.
Research of the influence of feedback signals in the neuroregulator on the quality of regulation
Authors: Dementev D A , Maximova E D , Sysoletin I A , Mezin S V
Published: May 2021

This paper describes the research of the influence of feedback signals in the neuroregulator on the quality of regulation. The approach to creation of a method of development of automatic control systems using artificial neural networks as a regulator with consideration of real technical equipment of automation is described. The effectiveness of feedback in a neural regulator is analysed by carrying out a complex study in relation to the variation of the object’s parameters. For a clear comparison, the transients for each object configuration have been summarised in common graphs. In addition, in order to analyse the effectiveness of the selected configuration, a modular quality index was calculated for each case and these values are tabulated in a common table.
Optimization of the composition and properties of heterocomposite materials for coatings obtained by the activation-heliotechnological method
Authors: Ziyamukhamedova U , Rakhmatov E , Nafasov J
Published: May 2021

The article presents the results of research on the development of compositions and the study of the properties of heterocomposite materials for coatings used for equipment for the collection, storage and transportation of oil and oil and gas products protected from corrosion and hydro abrasive wear. On the basis of the analysis of the existing devices characteristics for the mechanical activation of mineral particles, the mechanical activator installation “System of running drums” was developed. Using Newton’s interpolation formula and Lagrange’s method, trigonometric and functional factors were determined, regression equations were derived, which were used to determine the optimal type of filler and the quantitative effect of the compositions and properties of composite coatings and the exploited aggressive environment influence on the properties of the material. Analysis of the results of theoretical and practical research on the rational use of natural minerals can be used as a scientific basis for the targeted use of physicochemical phenomena, in particular priority factors such as the formation of positively and negatively charged particles on the surface of the filler-binder phase division.
Research the content of waste (yellow oil) of the shurtan gas chemical complex in Uzbekistan
Authors: Tilloev Lochin , Dustov Khamro , Alimov Azam , Bobokulov Farkhod , Ruziev Furkat
Published: May 2021

This article discusses the properties and composition of used oil for the purpose of processing waste oil which is a waste of the gas chemical complex to obtain secondary products and reduce its environmental damage through the efficient use of waste accumulated over the years.The study uses traditional methods for separating yellow waste oil by settling, determining the properties of the separated substances, separating dissolved gases when heating liquids, sampling and determining the gas content using a gas chromatograph and modern methods for calculating the properties of a gas mixture.As a result of the study, the physical properties of the waste oil and the oily part extracted from it were determined, the waste oil and the gases dissolved in the oil part were separated, their hydrocarbon content was determined, the properties of the gas mixture were studied.Based on the results of the study, an effective method for separating waste yellow oil was developed. The necessary information was obtained in the process of designing equipment and devices for processing the oily part. In addition to cleaning the waster oil from toxic substances released into the environment by direct degassing after installation at a temperature of 70°C, additional gaseous fuel for process furnaces can be obtained. Besides, the decomposition of emulsions can be achieved by improving the solubility in water of mineral salts mixed with oil and polymer components in the waste yellow oil. This, in turn, leads to the conclusion that degassing can accelerate the decomposition of waste oil by settling it.
The application of 3D printing systems in the bachelor’s engineering educational process
Authors: Kovalenko I V , Amuzade A S , Bobrovand A V , Petukhov R A
Published: May 2021

In this article the abilities of 3D-printing technologies in the bachelor’s educational process are considered in the specialities of electric power industry and electrical engineering. An example of the 3D printing systems implementing in the educational process and the experimental modeling is presented in research works of students. The analysis of problems arising in the implementation of 3D printing systems was made and the assessment of the student’s interest degree and motivation in operating with this technology were carried out. As a result, it was concluded that 3D printing can help create an improved learning environment for students, and takes into account different methodological styles of the educational process.
Effect of a powerful low-frequency signal on an anisotropic medium over hydrocarbon
Authors: Yanushkevich Viktar F , Dauhiala Dzmitry A , Adamovich Aliaksandr L , Abramenka Siarhei N , Bogush Vadim A
Published: May 2021

The article analyses the interaction of a powerful low-frequency signal with an anisotropic medium over hydrocarbon deposits. The behaviour of the real and phase components of the surface impedance of the medium above the deposit in the mode of dual-frequency signals is studied. The analysis of the components of the surface impedance of the medium over hydrocarbons for electromagnetic waves with right and left circular polarizations is carried out depending on the permittivity and frequency of the probing signals. The obtained research results can be used in exploration geophysics to identify the environment above the deposits by the size and nature of the material and phase components of the surface impedance of the surface layer above the hydrocarbons.
Metrological analysis of a magnetometer to measure the magnetization of magnetic nanofluids in strong magnetic fields
Authors: Bolotov A N , Novikov V V , Novikova O O
Published: May 2021

The successful application of magnetic nanofluids requires magnetometric instruments for studying their magnetization processes. The paper proposes a design of a mobile magnetometer with Hall sensors, which made it possible to take into account the features of the physical and mechanical properties of a wide range of laboratory and industrial magnetic nanofluids. Permanent magnets made of SmCo
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alloy and magnetic cores made of soft magnetic steel form the device magnetic circuit. Magnetic fluxes add up in a magnetic fluid area and create a uniform field with an intensity up to (2 ÷ 4) ⋅ 105 A/m. The magnetizing magnetic field intensity and the value of the magnetic field induction in a nanofluid are measured using Hall effect transducers, which are connected oppositely in a single measuring electrical circuit to determine the Hall EMF of the proportional magnetization of the material under study. A circuit method for correcting the non-equipotentiality EMF is used to improve the measurement accuracy. A comparative estimate of the relative error in measuring the magnetization of magnetic nanofluids was less than 2 %. It has been established that the magnetometer methodological error is due to the fact that Hall effect transducers do not reflect the field in the substance correctly due to non-magnetic gaps. The device methodical error was estimated by numerical simulation of the magnetic field parameters in a real magnetic system of the MDM-P1 device using the Elcut computer program. Based on the results of a numerical analysis of the device magnetic system model, we have found the dependences of the methodological error in measuring the induction of the magnetic field in the substance and the magnetizing field intensity on the size of non-magnetic cavities in the device magnetic circuit and the magnetic properties of the materials under study. It is shown that the relative methodological error in determining the magnetization of magnetic nanofluids on the MDM-P1 device does not exceed 1 %.
Calculation of initial dynamically unstabilized sections in the elements of liquid rocket engines turbopump units
Authors: Zuev A A , Arngold A A , Nazarov V P , Mehtieva V N , Khodenkova E V
Published: May 2021

The article considers an analytical approach to the relative characteristic parameters determining in the initial hydrodynamically unstabilized sections. Using the momentum equation, analytical equations are obtained for the dynamic boundary layer thickness determining. Laminar and turbulent flow regimes were considered. It is noted that the initial sections are characteristic for the flow around such surfaces as: blades of turbines and centrifugal pumps, nozzle elements, cavities between the casing and the rotor of the turbopump unit. In the flowing parts of liquid propellant rocket engines turbopump units, relatively short spatial channels, characterized by the presence of non-merged dynamic and temperature boundary layers prevail. The initial section significantly affects the flow regime, length loss and heat exchange processes. The analytical dependencies obtained cover a wide range of flow regimes and are in good agreement with the experimental data of other authors. An approach is given to determine the hydrodynamic parameters for the initial sections that affect the overall flow pattern in complex spatial channels with different degrees of curvature in the presence of a pressure gradient.
Self-adapting automated mode control system of packed absorbers used for selective gas emission treatment
Authors: Persidskiy A V , Merentsov N A , Golovanchikov A B , Tezikov D A , Groshev V V
Published: May 2021

This paper describes the designed self-adapting automated mode control system of packed absorbers used for selective gas emission treatment. It contains the description of automated control chart of the packed absorber and the algorithm of control program of the mass exchange system. The paper covers the principle of self-adapting control and steady maintenance of emulsification (phase inversion) mode depending on existing concentrations to be collected from continuous gas phase flow.
Preparation of solutions of copper and nickel en and dien complexes- an illustration of the Jahn-Teller effect
Authors: Takaeva M A , Bisergaeva R A , Sirieva Y N
Published: May 2021

With the advent of methods that effectively solve the problems of modeling metal ions in the gas, water, and solid phases, computational tools are becoming increasingly important in chemical research. here we consider both quantum and classical strategies for modeling systems containing metal ions that have been developed over the past few decades. This experiment was performed to study solutions of copper (II) and Nickel (II) complexes containing the following ligands, such as ammonia, diene, ene, and water in molar ratios, and to characterize the visible spectrum of the prepared solutions. The research was divided into three parts. In the first part, Nickel complexes were prepared and their formulas were determined using the job method. The second part of the experiment was performed to obtain EN-complexes of copper (II), and in the last part diene complexes were obtained. Dien and en were used as ligands.
Frequency dependence of magneto-optical phenomena in nonmagnetic dielectric nanostructures
Authors: Jumaev Mustakim , Sharipov Mirzo , Rizoqulov Mirzokhid , Ergasheva Nilufar
Published: May 2021

The frequency dependences of the Faraday rotation angle and the ellipticity angle are studied taking into account light absorption in dielectric media. The extreme values of the above values are determined, as well as the field of their application in dielectric media.
Evaluation of the adhesion strength of linear filler fibers of composite polymer reinforcement
Authors: Ganziy Yu V , Churkin A V , Dementev V B
Published: May 2021

The article discusses a method for evaluating the adhesion strength of linear filler fibers by tangential stresses obtained during shear tests of end cylindrical axisymmetric beads on a composite polymer reinforcement rod. The geometric parameters and material of the tested samples, the used equipment, the measuring instruments and the results of the tests are presented.
Extraction of eugenol, a natural product, and the preparation of eugenol benzoate
Authors: Bisergaeva R A , Takaeva M A , Sirieva Y N
Published: May 2021

This experiment was carried out to extract the eugenol from cloves in the part A, also to prepare the eugenol benzoate in part B. The experiment conducted, extraction of the essential oil eugenol from cloves. To perform this experiment cloves and water were mixed together and heated by a heating mantle in a round-bottom flask. A direct stem distillation took place, and the oil product was out aside for two weeks. After two weeks, the extraction of the eugenol and the preparation of eugenol benzoate actually took place. Next the light yellow eugenol from part A was characterized by the thin-layer chromatography (TLC) plate and 1H NMR analysis; however, eugenol benzoate from part B also was characterized by 1H NMR and Melting Point analysis. The products were analysed to check the purity, and to make sure there are no impurities. The experiment involved the use of techniques, such as steam distillation, gravity filtration, vacuum filtration to collect the product, recrystallization to purify the product, and the weigh to weight out the products.
Sample Clock Offset Compensation in the fifth-generation new radio Downlink
Authors: Assaf Mohammad , Ponomarev Oleg G
Published: May 2021

In this paper, the authors investigate the issue of sampling clock offset (SCO) in fifth generation new radio systems. Due to the imperfect SCO estimation methods, the correction methods relying on the SCO estimation will not be perfect, so the proposed method directly corrects the effect of SCO without using any kind of estimation methods. Our method can work well in physical downlink shared channel (PDSCH) and use reference signals as recommended by the 3rd generation partnership project (3GPP) standards. Through system-level simulations, the obtained results show that the throughput of the system is improved where the gain difference between the proposed method and the case without SCO compensation arises to reach 25 % over tapped-line (TDL) channel.
Study of mechanical characteristics by nanoindentation of an ion-implanted Ti-Ni shape memory alloy
Authors: Yu Usanova O , Stolyarov V V , Ryazantseva A V , Sh El’-Bekai B
Published: May 2021

This article examines the effect of ion implantation on the change in the mechanical characteristics of the Ti-Ni shape memory alloy. A comparison of the characteristics was carried out in the coarse-grained and nanostructured state on the initial alloy samples and on the samples after ion implantation. The implantation mode was chosen as the most optimal on the basis of previous studies. Irradiation mode parameters: dose - 2.3·1017 ion/cm2, energy - 40 keV, ions -nickel, temperature - did not exceed 200 °C. The characteristics were studied by the nanoindentation method on a NanoHardnessTester, (CSM Instr.) At a load of 2 mN using a Berkovich-type diamond indenter. According to the data of nanoindentation by the Oliver-Pharr method, the value of hardness and Young’s modulus of elasticity were determined. Research results show that ion implantation leads to an increase in hardness.
Questions of type selection of lighting devices for underwater telecommunication television systems
Authors: Martynov V L , Skripnik I L , Ksenofontov Yu G , Kaverzneva T T , Pshenichnaya K V
Published: May 2021

The problems of studying the underwater part of the water area through the lens of ecology exist all over the world. Difficulties associated with the study of the ecological state of the hydrosphere pose for modern engineers the task of developing specialized autonomous underwater robotic systems, as well as using telecommunication means to transfer information from them to the shore or ship. Due to the fact that visibility under water has a limited range, that is, it is possible to observe underwater objects only from a close distance, it is proposed to use underwater telecommunication television systems that function in conjunction with lighting devices. The article presents the results of an experiment carried out in a marine aquatic environment, on the basis of which the expediency of using light searchlights and laser devices in the near and far zones in underwater search systems is substantiated.
The effect of twisting of cable elements on its stress-strain state during bending
Authors: Ismailov G M , Nizhegorodov A I , Nevinitsyna V S , Notkina V O , Osipkina Y A
Published: May 2021

The paper considers the stress-strain state of cables of various designs under bending deformations. Using the Ansys program, the tribological interaction of cables with twisted and parallel-laid conductors is simulated, the contact interactions of its individual elements are determined. Analysis and comparison of the stress-strain state of cables will make it possible to assess the strength of materials and create the required cable design, depending on the operating conditions. These results can be used to create high-reliability cables at the design stage.
Environmental information system for monitoring landscaping objects
Authors: Popov A A , Avdeeva E V , Ovsyankin A K , Emomaliev M R
Published: May 2021

Today, as a result of the ongoing processes that take place in production, many pollutants enter the atmosphere, which have a negative impact on the environment. The city has accumulated many environmental problems, and the population is not fully aware of these gaps. And also for their solution, for the optimal organization of the activities of various management structures, complex cartographic information is needed. The relevance of the topic being developed is due to the fact that landscaping and gardening is the most important area of activity of the municipal economy. The tasks of optimizing the ecological urban environment, eliminating the consequences of negative impact on the environment, planning various natural-economic and sanitary-hygienic works, as well as the accumulation, processing and provision of information through the introduction of an ecological information system are being solved. The goal is to increase the level of ecology of the city by introducing a balanced ecological system of landscaping, combining urban and suburban green spaces; in the continuity of the processes of its qualitative renewal in space and time.
Creative graphic works of first-year students of Bachelors’ degree of engineering educational program
Authors: Mukhametzyanova A G , Bronskaya V V , Kharitonova O S
Published: May 2021

Such a form of organization of extracurricular work as a scientific circle is considered in this article. The purpose and content of the scientific circle on descriptive geometry, engineering and computer graphics are exposed.
Reengineering of organizational and technological processes of NPP construction
Authors: Voronkov I E , Usmanov T A
Published: May 2021

Nuclear power construction is characterized by high capital costs, a significant number of participants in the design and construction processes. One of the most significant factors of the efficiency of NPP projects implementation is the adopted technology for the construction. An analysis of the Soviet and modern experience in the NPPs construction allows to assert that the piece reinforcing application leads to an increase in the project implementation time. The technology of large-block assembling of NPP structures and equipment have been widely used by the world leaders in NPPs construction, but the implementation of this technology required significant costs for the organization of the necessary infrastructure. In the context of the rapid development of computing systems, instrumentation and mechanical engineering, it is proposed to fundamentally rethink the processes of NPP construction. It is proposed to return to the technologies of large-block installation of NPP structures by switching from rail lifting mechanisms to pneumatic wheels, by robotizing the processes of enlargement and installation of structures and equipment. The functions of managing and making organizational and technological decisions can be partially transferred to a specially developed neural network that has access to an array of data on previously implemented projects. This approach allows us to consider the NPP construction project as a cyber-physical system and opens the way to a whole range of areas of fundamental and applied research in the field of technology, organization and management of the construction of NPP.
Mean velocity profile for turbulent Taylor-Couette flow, deduced from generalized local balance model
Authors: Balonishnikov A M , Korshakova I A , Kruchkova J V
Published: May 2021

Mean velocity profile for Taylor-Couette flow was obtained by means of the angular momentum conservation law, the local balance of kinetic turbulence energy and the dissipation transport equation. The resistance law was derived by a simple method. A comparison with the experiment was made for rotating inner cylinder, the outer cylinder was at rest.
Building a business process management model for a «smart» enterprise
Authors: Nurgaliev R K , Shinkevich A I
Published: May 2021

The article examines the possibilities of using Petri nets in the context of automated business process management of a «smart» enterprise. On the basis of the studied methodology, a system Petri net is built, adapted to «smart» production. The network architecture is clearly presented and deciphered in detail, events and transitions implemented within the framework of various functional subsystems of an industrial enterprise integrated into a single information platform are described. The proposed Petri net can help reduce the transaction and transformation costs of reengineering associated with the digital transformation of the enterprise.
Numerical algorithm for the problem of the technological process of filtering low-concentrated suspensions
Authors: Yu Palvanov B , Saidov U , Sharipov M
Published: May 2021

The paper presents a mathematical model in the form of a second-order nonlinear differential equation with initial and boundary conditions and a numerical method for solving the problem based on the finite-difference method of the technological process of filtration of low-concentration suspensions to determine the ranges of variation of the ion-exchange filter parameters, as well as the results of computational experiments. When developing a mathematical model, the following main filter parameters and physico-mechanical properties of solutions (liquids) were taken into account: filtration rate, rate of sedimentation of gel particles on the pores of the filter, filter porosity, filter layer thickness, kinetic coefficient, dynamic viscosity coefficient and outlet concentration of the suspension. The developed mathematical model and a numerical solution method allow determining the deposition rate of gel particles in the pores of the filter, the outlet concentration of the solution and changes in the concentration of the driving solution of the ion-exchange filter.
Analytical model of a shielding enclosure populated with arbitrary shaped dielectric obstacles
Authors: Ivanov A A , Komnatnov M E
Published: May 2021

This paper proposes a new analytical model for an approximate evaluation of the shielding effectiveness (SE) for an enclosure populated with arbitrary shaped dielectric obstacles. The model is based on the enclosure equivalent circuit method proposed by Robinson et al. Dielectric obstacles are taken into account in the calculation of the characteristic impedance and the propagation constant for each regular part situated along the enclosure length. To do this, the model uses the effective value of relative permittivity, which is determined in the cross section of each regular part from a simple percentage ratio. Using the proposed model and the finite element method, the SE calculations were performed for three typical enclosures populated with different dielectric obstacles. The obtained results are in good agreement, and the average value of the absolute error does not exceed 4.4 dB.
The dynamic stochastic model of a boiler unit
Authors: Kutsy N N , Podkorytov A A
Published: May 2021

The goal is to develop a model that takes into account the boiler unit furnace device dynamics. The D J Box and G Jenkins technique used to identify the steam production process is considered. As the object of the study selected a boiler unit, which is quite complex and interconnected. Its description is a dynamic stochastic object with uncontrollable indignant influences. Statistical methods have obtained a mathematical model, which can be used to predict and regulate dilution in the boiler furnace.
Influence of a center of mass position on beam natural frequencies of vibration
Authors: Mityaev A E , Kudryavtsev I V , Ivanov V A , Khomutov M P , Kolotov A V
Published: May 2021

The paper discusses the effect of beam center of mass displacements on the values of their first natural vibration frequencies. Three schemes of beam restraint with a displacement of the center of mass along all axes of a coordinate system and around them are considered. It is established that if the center of mass is in the center of the beam, then any of its small linear and angular displacements slightly affect the first natural frequencies of vibration. If the center of mass was near the support, its longitudinal displacements along the beam will significantly affect the first natural frequency of bending vibrations. The transverse displacements of the center of mass will change only the natural frequencies of the torsional vibrations of the beam, which are usually quite small. Small angular displacements of the beam center of mass do not change the first natural frequencies of vibration at any location relative to the beam.
Main approaches to the development of mechanical engineering as an echelon of economic dynamics
Authors: Tikhonov G V
Published: May 2021

In the present article the specificity and basic directions of development of domestic mechanical engineering are considered. The optimality of a choice of progressive system of maintenance including procedures of fast management of manufacture of production, allowing raising efficiency of administrative and financial work at the enterprise, and also competitiveness of let out production is proved. This allows improving the organizational and economic model of operational production management, focused on improving the competitiveness of the machine-building enterprise products.
Metrological support integration in conditions of digital transformation
Authors: Dudukalov E V , Munister V D , Zolkin A L , Galanskiy S A , Rudnev S G
Published: May 2021

The article formulates the problems of the development of measurement control regulators in digital platforms. Attention is paid to the role of the digital revolution and metrology on the economy of enterprises and the transformation of the service sector model as a whole. Attention is paid to the impact of the digital revolution and metrology on the economy. The article presents and substantiates the policy of introduction of metrological support for innovative development in the context of the digital cybernetic revolution. The proposed policy pays attention to the consideration of the fundamental model of cyber-physical systems, as a technological basis for the implementation of a new industrial evolution in metrological context. The importance of organizing of measurement principles in network infrastructure and communication protocols in the context of economic transformation is emphasized. A model of the use and implementation of chaos engineering and information technologies in metrological apparatus is considered.
Results of the study of desert soil as a source of surface runoff formation
Authors: Saidova M , Yunusov I , Talipova D , Shafkarov F
Published: May 2021

The Kyzyl Kum Desert in Uzbekistan has not been adequately studied, despite the fact that it occupies more than half (68.7%) of the country’s territory. Even in ancient times, the lands of Kyzyl Kum were used as pasture and now these lands are a classic example of distant pasture animal husbandry, including karakul breeding. The industry is developing with guaranteed sales markets, whose products are export items. In the desert, the main factor in the cultivation of crops is the lack of water resources, and the resources of the rivers of Uzbekistan are almost completely depleted. The aim of the study is to scientifically substantiate the possible volumes of surface runoff in the desert, which could be used in the interests of agricultural production, as well as for the creation of local systems of domestic drinking water supply.
Physical and mathematical measurements of potential hazard during storage of diesel fuel at the tank battery
Authors: Zhuravleva N G , Shcherbina A F , Pankratova M E , Yu Aleksandrova E , Trotsenko A A
Published: May 2021

The article briefly describes the results of calculations of probable potential accidents (emergencies) at a technical facility designed for storing diesel fuel at a tank battery and their consequences for humans and the environment. The calculations considered the most important parameters: the amount and hazard class of substances, the volume, and area of industrial premises, temperature and pressure fluctuations, the distance of personnel from the damaging factor, etc. It was revealed that such types of accidents as an explosion of a fuel-air mixture, a pool fire, jet fire, an explosion inside equipment, an explosion inside a building are possible at this enterprise. As a result of calculations, it has been established that the most likely accident will occur in case of partial depressurization of the pipeline and the formation of the pool fire, the number of the forecasted casualties is 1 person.
Determining the linear network code parameters to minimize the destructive factors influence in telecommunications systems and networks
Authors: Britvin N V , Karpukhin E O
Published: May 2021

The paper analyzes the searching results for the linear network code optimal parameters using a binary symmetric channel and queuing models. A conclusion is made about the correcting ability dependence and the code sequence length on the bit distortion and overloads probability in networks. The study showed using the network coding method possibilities and limitations to counteract destructive factors in the network. The conclusion is made about the code parameters choice with correlated packet losses and the combined use of both models.
Influence of the rotor speed of the water-ring pump on the vacuum transport unit operation
Authors: Naumov V A
Published: May 2021

Vacuum transport units based on water-ring pumps are used for pumping aggressive liquids. The previously developed mathematical model of the liquid pumping process was used to assess the effect of changes in the rotor speed. The load characteristics of the ELRS-45 water-ring vacuum pump from ERSTVAK were used in the calculation. The numerical method was used to solve the system of differential equations. Increasing of the rotor speed leads to a decrease in the absolute pressure in the tank at the end of the first step. As a result, the volume of liquid pumped in one cycle increases significantly. The average performance of the unit is significantly increased. While energy efficiency decreases. The calculated parameters allow you to select the characteristics of automatic control of the system.
Electronic control of the antenna array direction pattern of the vertical atmospheric probing radar station
Authors: Ratuschnyak V N , Dmitriev D D , Gladyshev A B , Tyapkin V N , Bellman S V
Published: May 2021

The article is considered formation and control issues of a small-element antenna array direction pattern of vertical probing radar stations for monitoring the atmosphere. The features of the vertical probing radars functioning and construction with a small-element array are presented. In the article is presented comparative analysis, which based on results of the simulation and on change nature in the direction patterns when the main beam deviates from the vertical for rectangular and annular antenna arrays.
Analysis of stream-guiding structures for the use of sediment management in river beds
Authors: Anokhin A M , Tkachev A A
Published: May 2021

The article analyzes the stream-guiding structures of M.V. Potapov and Odgaard, A.J. in order to use sediment management in the river bed. Odgaard, A.J. and other authors have developed the continuation of the use of artificial transverse circulation for sediment transfer within the cross-section of the channel, developed by M.V. Potapov, and created a method for calculating bottom guide sills for various application conditions. The authors have developed and tested by model and field studies typical configuration of the panel system. Convergence of the main parameters of bottom shields according to Odgaard, A.J., and M.V. Potapov argues that the way Iowa’s submerged shields are used has its merits and is a sediment control method for waterways and rivers in general.
Information and measurement systems for environmental monitoring: a regional aspect
Authors: Letyagina E
Published: May 2021

This article outlines the results of a study of information and measurement systems (IMS) used in monitoring the state of the environment in large urban agglomerations and their application using Krasnoyarsk Krai, Russian Federation, as an example. Additionally, it offers an analysis establishing the structure, constituent elements, as well as the effectiveness and efficiency of the use of IMS for monitoring the state of atmospheric air pollution in large urban agglomerations in the Krasnoyarsk Krai. The paper presents the results of observation and control over the state and degree of atmospheric air pollution for 2020 in the cities of Krasnoyarsk, Zelenogorsk, and Kansk. The problems that can be solved through application of automated IMS for monitoring the environmental situation in cities have been identified, specifying the challenges of using regional systems for monitoring the ecosystems of the territories of the Russian Federation. Additionally, the paper investigates the problem of the variety of automated IMS used in different regions of Russia to monitor the state of the environment in large urban agglomerations. The study identifies the prospects and features of further development of automated IMS for controlling and monitoring pollution and the state of the environment of urban agglomerations.
Problems of introducing an integrated scientific development management system
Authors: Krutov A V
Published: May 2021

To achieve the required quality of technology in the creation of new technology, an applied research management system is required. The purpose of the article is to identify problems and ways to solve them when introducing a complex new system in high-tech industries. The methodology includes a systematic analysis of sectoral scientific activities in strategic planning and forecasting the development of technologies and management of the creation of a reserve. The system is built on modern principles of technology development and scientific potential: programmatic and targeted approach, optimization of research in several areas and choice of one as the main research concept, assessment of the level of technical excellence, strategic and tactical planning to achieve the predicted result. An attempt is made to cover the whole range of problems of introducing an innovative system with the aim of general understanding of the strategy of its implementation, development of a methodology and program.
Population health risk assessment associated with air pollution in the area of natural chalk industrial processing complex influence
Authors: Stepkin Yu I , Prozhorina T I , Kurolap S A , Klepikov O V , Boeva A S
Published: May 2021

Increased air pollution in the areas where large mining complexes are located poses a risk to public health. The article examines harmful substances atmosphere emissions’ impact on the population health living near an industrial mining enterprise of the Kopanishchensky natural chalk deposit in the Ostrogozhsky district of the Voronezh region. Environmental risks calculations showed that out of 36 chemical substances that pollute the atmosphere, 5 substances have a carcinogenic effect. The maximum values of the total carcinogenic risk do not exceed the dangerous threshold, however, they need to be carefully monitored. The main contributor to the total risk is carbon soot – 99.9%. Calculations results of non-carcinogenic risks due to inhalation exposure showed that the respiratory organs which are negatively affected by 8 out of 10 priority chemicals, are most potentially affected.
Mathematical model of the effective use of reclaimed lands in the South of Russia
Authors: Apazhev A K , Shekikhachev Y A , Hazhmetov L M , Shekikhacheva L Z
Published: May 2021

To assess the state of reclaimed land by purpose and intensity of use, it is necessary to fully apply the following set of indicators: the quality of irrigation water; the depth of groundwater; the salinity of underground water; the degree of salinity of the soil; leaching of the soil; the degree of soil contamination with fluoride, heavy metals and other pollutants; the composition and amount of humus; the density and structural-aggregate composition of the soil; the degree of occurrence of adverse exogenous processes. The main of the indicators is the depth of ground water, which during the growing season is considered relative to the “critical” depth, i.e. the depth at which the optimal water-air regime is determined for growing crops and preventing secondary salinization of the soil. The direction and speed of soil formation processes are also determined by the quality of irrigation water, climatic and hydrogeological conditions of the region, soil topography, natural properties, irrigation techniques and technologies. On reclaimed lands, soil degradation occurs only under certain conditions. The most common degradation processes are: rising groundwater levels; activation of geochemical processes at the local, regional and global levels. Secondary soil salinization is observed on the reclaimed lands. The desalination process is determined by the quality of irrigation water, soil properties, depth and salinity of groundwater; leaching of the soil and an increase in toxic alkalinity, pH; drainage of irrigated soils is formed due to the development of erosional, alkaline and saline processes, the presence of perennial grasses and organic fertilizers in the crop rotation. With soil salinization, the qualitative composition of humus changes, agrophysical degradation of reclaimed lands, modification of mineral soil components and increased hydrophilicity during irrigation. According to the above indicators, the full range of degraded lands in the region is unknown, since it requires regular monitoring of the reclaimed lands. Taking into account the above, studies aimed at increasing the efficiency of the use of reclaimed lands in the South of Russia is an urgent problem.