bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of roughness on the bond strength of decorative coating applied by cold gas-dynamic spraying
Authors: Dudnik M , Gordin Yu
Published: December 2021

The adhesion strength of joints obtained by cold gas-dynamic spraying (CGDS) on cast iron base has been investigated. It is known that corrosion resistance of CGDS coatings is largely determined not only by the nature of the sprayed material, but also by its adhesion properties. This paper is a method for predicting the adhesion strength of a protective and decorative coating, which is a useful tool for engineers when studying the effect of certain technological parameters on the adhesion strength of cold gas-dynamic spraying. The results of an experimental study of pretreated surfaces and powder materials are presented. The optimum heating temperature was determined and a choice of material and method of substrate processing which ensures maximum adhesion strength under given technological conditions was substantiated. It was shown that the temperature of heating of the product surface essentially influences the adhesion strength of the coating. Besides the quality of the preprocessed surface is one of the factors providing the coating adhesion strength to the substrate. The dependences of the influence of the temperature of heating of the sample and the roughness of the surface on the adhesion strength are presented. The use of cold gas-dynamic spraying as a method providing high strength properties of copper and zinc protective-decorative coatings is proved.
Increase in productivity and quality based on the control of thermodynamic processes during deep profile grinding of the gas-turbine engine blade
Authors: Makarov V , Nikitin S , Pesin M , Karmanov V , Norin O
Published: December 2021

The article provides the system of interaction of dynamic processes during deep profile grinding of complex profiles on a multiaxis machine, the influence of dynamic processes on the quality of the surface layer, the endurance limit of the gas-turbine engine blade. The method presented allows to assign corresponding grinding modes based on the forecast of the dynamics of elastic, thermal and working processes in a thermomechanical system. This technique allows to control the process of deep profile grinding to achieve the specified parameters of surface quality, the endurance limit of the blade and increase process efficiency.
Mathematical model of wedge-shaped plain bearing considering the dependence of viscosity on pressure
Authors: Mukutadze A , Prikhodko V , Dolgiy I
Published: December 2021

This paper outlines a new approach for finding an asymptotic and exact self-similar solution for the zero and first (without taking into account the melt and considering the melt, respectively) approximation of the wedge-shaped plain bearing with a non-standard support profile of the slide and the low-melting metal coating of the surface. The given approach is based on the flow equation of a ferromagnetic fluid for a «thin layer», the continuity equation, as well as the equation describing the profile of the guide’s molten contour. The proposed method takes into account the dependence of the rheological properties of the lubricant and the melt that have ferromagnetic properties in the laminar flow on pressure. We have succeeded in obtaining accurate analytical dependences for the field of velocities and pressure at zero and first approximations and the ones for the profile of the guide’s molten surface. Besides, we have managed to determine the key performance properties for the slide–guide friction pair, including load-bearing capacity and friction force. Finally, we could assess how the bearing capacity and friction force are influenced by parameters caused by the coating melt adapted to the conditions of the support profile friction and a parameter that characterize the rheological properties of the lubricant.
The performance evaluation of heavy loaded tribosystems with vacuum ion-plasma PVD and DLC coatings
Authors: Kolesnikov V , Manturov D , Kolesnikov I
Published: December 2021

The results of studies of the physical, mechanical and tribological characteristics of PVD and DLC coatings are presented. The complex of basic mechanical properties (hardness H and elastic modulus E), as well as derivatives of mechanical characteristics H/E and Н3/Е2
, were investigated by the method of continuous indentation at various loads. The friction coefficient, the wear rate of the sample and the counterbody were determined as tribological indicators. The applied purpose of the work was to determine the friction unit for applying the developed coatings, materials and modes of applying PVD and DLC coatings. To solve this problem, a test bench was designed and built that simulates the operation of the selected friction unit. As a result of the research carried out, the results of laboratory and bench tests were compared. The performance of the coatings was determined by the volume of the tooth wear of the sleeve and the tip with the help of the method of micrometric measurements. As a result of the study of the surface morphology, the volumes of wear of rubbing conjugations and the intensity of their wear were determined. It has been established that the results of bench tests confirm laboratory studies and suggest that such an installation can be used for researching other heavily loaded spline conjugations.
The prospects and scientific solutions for the application of the innovative technologies to create vacuum-levitation vehicles
Authors: Kolesnikov I , Kolesnikov V , Boiko M
Published: December 2021

The elevated transport system is currently being challenged to increase speed. Of course, Russia is facing this problem because of its vast territory connecting the economic centers of the European Union - the North American continent - Southeast Asia. The answer to this challenge is the vacuum-levitation transport system (hereinafter VLTS), which significantly increases the speed of freight and passenger traffic. In fact, you can list many more tasks when creating VLTS - these are issues of safety, earthquakes, landslides, floods, karsts and others, but we will focus on the field of chemistry and the sciences of composites, which will be the subject of this article. When developing VLTS, it is necessary to determine the behavior and reliability of friction units - this is a braking system, a center plate - a thrust bearing, a reducer, etc. The fundamental difference between tribocontact surface layers operating in air and vacuum is that oxide films are formed during friction in a gas environment and thus there is no contact between juvenile surfaces, and in a vacuum, juvenile surfaces are seized, which leads to intense wear. The article presents a technology for increasing the wear resistance of metal-polymer friction units, taking into account the properties of polymer composites to form secondary structures on the friction surface.
Reactive inductor machines on transport
Authors: Grebennikov N , Kireev A
Published: December 2021

The experience of using reactive inductor machines (RIM) on vehicles is described. Over the past decade, the interest in RIM for the transport industry has significantly increased. One of the promising areas of RIM use is hybrid vehicles. A RIM has a simple design, high reliability and performance. It is capable of operating in motor and generator modes. The world experience in the development of vehicles with RIM has been promising in using this type of electric machines in electric power transmissions of locomotives.
Thermal processes in the stack of perishable cargo transported in the heated isothermal car
Authors: Voron O , Moiseev V
Published: December 2021

The article deals with the organization of heat exchange processes when using a new heating system for the cargo room of the isothermal car. Using the example of considering a stack formed from glass containers with fruit juices packed in cardboard boxes, the equivalent thermophysical characteristics of the cargo in the stack are formulated. Analytical methods are used to determine the main regularities of the regular thermal regime and the nature of thermo-gravitational flows in the cargo room of the car. The possibilities of improving the design of the heating system of the cargo room of isothermal rolling stock for the transportation of perishable cargo are considered. The possibilities of modernization of specialized equipment allowing optimization of the temperature regime in the cargo room of the car are presented. The article deals with the organization of heat exchange processes when using a new heating system for the cargo room of the isothermal car. Using the example of considering a stack formed from glass containers with fruit juices packed in cardboard boxes, the equivalent thermophysical characteristics of the cargo in the stack are formulated. Analytical methods are used to determine the main regularities of the regular thermal regime and the nature of thermo-gravitational flows in the cargo room of the car. The possibilities of improving the design of the heating system of the cargo room of isothermal rolling stock for the transportation of perishable cargo are considered. The possibilities of modernization of specialized equipment allowing optimization of the temperature regime in the cargo room of the car are presented.
Error analysis of the cutting machine step adjustable drive
Authors: Rudikov D A , Ilinykh A S
Published: December 2021

The implementation precision of a number of adjustment bodies of a metal-cutting machine is also the most important indicator of its quality, a strictly standardized industry standard, technical conditions for manufacturing and acceptance. Moreover, the standard for limiting the error is set depending on the used denominator of the series. An essential feature of the precision of the series being implemented is that it is determined not by an error in parts’ manufacturing, but by the disadvantages of the used method of kinematic calculation. The established modes largely determine the efficiency of processing on metal-cutting machines. If the setting is set to an underestimated mode, then the performance is reduced accordingly. In the case of the mode overestimation, this leads to a decrease in durability and losses due to increased regrinding and tool changes. Creation of a complex of mathematical models for the design kinematic calculation of the metal-cutting machines’ main movement drive, which allows reducing the error in the implementation of a series of preferred numbers and increasing machining precision. The article provides a mathematical complex for analyzing the total error components, which allows determining and evaluating the total error of the drive of a metal-cutting machine by analyzing its constituent values with high precision: errors of a permanent part, errors of a multiplier part, rounding errors of standard numbers, errors in the electric motor and belt transmission. The presented complex helps to identify the role of the rounding error of preferred numbers in the total relative error formation and makes it possible to reduce it, which allows solving the problem of increasing the step adjustable drive precision. When using a mathematical complex, a fundamentally new opportunity for creating a scientific base appears, developing algorithms and programs for engineering calculation of tables that facilitate the selection of the numbers of teeth for multiple groups, structures and guaranteeing high precision of the implemented series.
Study of heat transfer during steam condensation in the tubes of diesel radiator cores
Authors: Sklifus Ya K , Ignatieva O V
Published: December 2021

The article contains an assumption about the practicability of using the processes of boiling and condensation of the coolant in the cooling system of a locomotive diesel in order to reduce the energy consumption of fans of the refrigerating chamber. The possibility of using of standard radiator cores of a diesel locomotive with flat tubes as steam condensers is considered. The results of the criterion equation of heat transfer from steam to a flat tube during condensation, obtained by the mathematical model of this process, are estimated. The assessment was carried out by comparison with experimental data. The influence of the initial steam velocity, the corresponding tube diameter, the working length of the tube, the physical properties of steam and condensate is considered. The comparison of the influence of these factors on heat transfer in round and flat tubes of a locomotive radiator core is carried out. The processed results of physical and numerical experiments for both circular and flat tubes are shown in the graphs and regression equations. The advantage of flat tubes over round ones in terms of heat transfer intensity during steam condensation, which can reach 24%, for a standard radiator core of a diesel locomotive was found.
Justification of the structure and determination of the mathematical model parameters for a mechanical system with tribospectral optimization
Authors: Shcherbak P , Kuznetsova M , Razuvaev D
Published: December 2021

The questions of determining the structure and parameters of the working bodies mechanical system model for the track renewal train with tribospectral optimization are considered. It is proposed that the tribospectral characteristics should be considered as an optimization parameter recognition source. The main attention is paid to the identification of the main regularities in the realized tribospectrum of the useful vibration signal. Based on the results of processing the vibration acceleration spectra, possible signs of optimization assessment are proposed.
Luminescence decay kinetics as a tool for quality control of polymer materials used in railway transport
Authors: Nikitchenko V , Gromova E , Semenov A , Ruban A
Published: December 2021

Protective coatings and composite materials based on polymer materials are widely used. They are used in construction, railway, water and air transport to protect various structures from the harmful effects of the environment. In order to create new materials with greater strength and durability, the research related to the development of methods for controlling their quality and the formation processisneeded.The luminescence of chromophores (molecules capable of luminescence) attached to polymer molecules (polymer chains) is an effective tool for this control. The paper discusses the effect of the polymer chain size and the nature of the interaction of its units on the chromophores’ luminescence decay kinetics.
Detection of particles of dark matter from the spectrum of secondary particles in high-energy proton-proton collisions in a thermodynamic model
Authors: D’yachenko A T , Gromova E S
Published: December 2021

In a simple hydrodynamic model, the transverse momentum distributions are found for A hyperons formed in pp collisions at ultrarelativistic energies. The calculated spectra are compared with the experimental data obtained for various colliders in a wide range of proton collision energies, including the data from experiments at the Large Hadron Collider. An interpretation of the transverse momentum spectra of soft photons in pp collisions is proposed, taking into account the X17 boson with a mass of 17 MeV - a new particle, a possible candidate for the role of dark matter particles. A tube model is proposed on the basis of combining two-dimensional quantum chromodynamics and quantum electrodynamics. An interpretation is proposed for the detection of a 38 MeV boson in the spectra of photons emitted in the reactions of protons with carbon nuclei at an incident proton momentum of 5.5 GeV/c. The X38 boson with a mass of 38 MeV has a mass close to the boson mass obtained by us, equal to 35 MeV for an electromagnetic tube. This new particle was discovered in experiments carried out recently in Dubna for the reactionp p + C→2γ + X. To interpret the obtained experimental data on the spectra of emitted photons depending on their mass, it is proposed to use the formulas obtained for massive particles, setting the mass of a boson decaying into two photons equal to 38 MeV. It was proposed to consider bosons X17 and X38 as particles of dark matter.
Control of plasma spatial distribution in gas discharge lamps filled with alkali metal vapors
Authors: Lapshin V F , Yu Florinsky V
Published: December 2021

The thermodynamic properties of alkali metal vapor plasma in the pressure range 0.25 - 3.0 atm and temperatures 1500 - 60000 K are considered. It is shown that a distinctive feature of this plasma is the existence of a relatively narrow critical temperature interval in which the plasma consists only of electrons and singly ionized atoms. The specific heat capacity of the plasma has a minimum value in the critical temperature range, corresponding to the heat capacity of a simple e-i plasma in which the second ionization of atoms has not begun. It has been shown that, due to this property, in gas discharge lamps filled with alkali metal vapors, it is possible to control the type of spatial distribution of the plasma. Under relatively low currents, when the temperature of the plasma doesn’t reach the critical range of the value, the traditional space distribution of the plasma is realized in the gas discharge tube. In this case, most of the plasma is concentrated in the axial region of the tube and its concentration decreases along the radius from the axis to the walls of the tube. With sufficiently high currents, when the plasma temperature on the axis exceeds the values from the critical interval, the opposite case is realized: the main part of the plasma is now concentrated on the periphery of the gas discharge volume. In this case, the plasma concentration increases along the radius from the axis to the tube walls. It is shown that the transformation of one type of spatial distribution of plasma into another occurs when the plasma temperature on the axis reaches values from the critical interval and the specific heat capacity approaches its minimum value, corresponding to a simple plasma consisting of electrons and single-charge ions.
Mathematical modeling of a new method of transportation of viscous petroleum products at low air temperatures
Authors: Moiseev V I , Ksenofontova V A
Published: December 2021

High viscosity petroleum products such as fuel oils and cracking residues are widely used as marine and boiler fuels both in Russia and in its exports. Conveying viscous petroleum products at low air temperatures has a high cost due to the unloading and cleaning processes of the transport tanks. Refined petroleum product cools and solidifies during transportation, becoming highly viscous, making it impossible to drain it without preheating to restore fluidity. Emerging difficulties are common to all countries with long winters and geographically wide areas. To justify a new method of rail transport of viscous petroleum products while maintaining their high temperature and fluidity by suppressing the natural convection of the petroleum product at the stage of filling the tanker. Temperature field calculations using the finite element method and the ANSYS R18.2 package are presented. The business process of the proposed transport method is universal for all modes of transportation. Using Petri nets and simulation modelling, it is investigated using the example of cleaning a tank car boiler from highly viscous residual oil products. You must perform these operations periodically during the operation of the tank wagon, and they are mandatory before every scheduled inspection and repair. Viscous oil products can be transported in a new way, the duration of the cleaning process of the tank wagon boiler is reduced by three times and the amount of water consumed is reduced by one and a half times.
Assessment of the switching time and fluid type influence on the transient quality in hydro-mechanical systems
Authors: Osipov A V , Kurilkin D N
Published: December 2021

The number of transients in hydro-mechanical power transmissions accounts for a significant portion of the total operating time and has a significant impact on drive economy. The quality of the transients largely depends on their duration and the type of working fluid used. The purpose of the work is to analyze the transients in the hydro-mechanical system, taking into account the effect of the duration of switching processes and the type of working fluid used. Determination of transient parameters in the hydro-mechanical power transmission was performed on the basis of mathematical dependences describing the switching process of two torque converters depending on the duration of the filling and emptying process and the influence of the type of working fluid used. Analysis of the calculated characteristics of transients in hydromechanical power transmissions showed that the main factor in the switching of torque converters, is the combination of filling and emptying processes, depending on the type of working fluid used. The obtained results give grounds to propose recommendations on coordination of filling and emptying processes in order to increase the efficiency of the hydromechanical drive.
Physical processes simulation in a precision device for liquid samples thermal cycling
Authors: Kiselev I G , Belov D A
Published: December 2021

An urgent task is the development of devices that provide a precision temperature change. The devices used in the real-time polymerase chain reaction method require not only repeated cyclic temperature changes with high accuracy, but also the temperature gradient minimization over the working fluid. In this article, the modeling of the working processes taking place in the thermal block of the device with the previously proposed thermohydraulic system, which ensures the temperature change together with the Peltier elements, is carried out. A mathematical model is formulated and a differential equation, boundary and initial conditions are substantiated. Numerical methods for solving the mathematical model in the Elcut software were applied. An experimental setup was developed and a study of heat exchange processes in the thermal block of a nucleic acid analyzer with a thermohydraulic system was carried out, confirming the adequacy of the developed mathematical model.
Operation of vibration source of an unbalance type with liquid-filled internal working chamber
Authors: Savchenko A , Nikolaev A , Evstigneev D
Published: December 2021

Equipment for increasing water inflow to the well is proposed, which affects the aquifer by seismic vibrations. The method is based on accelerating the filtration process in soils, exposed to vibration. The equipment can work in conjunction with a submersible pump and has the ability to pump liquid through the working chamber of the generator. Generators can be combined into a group and driven by one electric motor to increase the efficiency of vibration treatment. This method is built into the existing technology of dewatering and pits drainage. The dynamics of the vibration source operation of an unbalance type with a liquid-filled inner chamber was studied in laboratory conditions, on a test. The vibration source was attached to the stand frame and was in a vertical position coaxially with the electric drive, thereby simulating its location in the well. The unbalance was unwound by an electric drive with a rotation frequency of 10 to 50 Hz in 5 Hz steps and seismic vibrations, generated by a vibration source, were recorded. Based on the experiments’ results, the amplitude-frequency characteristics of an unbalanced vibration source in the low-frequency range with a dry and liquid-filled inner chamber were obtained. In order to prevent the bearing assemblies from jamming, their heating was monitored with a thermal imager and temperature sensors.
Longitudinal-transverse thermal- force bending and stability layered inhomogeneous profiled rod
Authors: Mishchenko A
Published: December 2021

The solution to the problem of the stress-strain state of an inhomogeneous profiled rod is based on the use of nonlinear equilibrium conditions and physical relations of a layered thermo elastic thin rod. A differential equation of bifurcation inhomogeneous rod stability of variable cross-section is obtained. The equation has variable functional coefficients. In the initial state, the rod is subjected to bending with the implementation of one of the asymmetric shapes. The critical state occurs under the action of a longitudinal load corresponding to one of the lowest symmetrical shapes, orthogonal to the initial shape. In the first series, numerical calculations of an inhomogeneous I-rod with a variable cross section height are performed. Shelves and wall I-rod are made of steel, aluminum and titanium alloys. The graphs of maximum deflection and normal stresses acting at the calculate points at the boundaries of the layers are plotted depending on the longitudinal load at the given levels of transverse loads and thermal field. A significant influence of the rod physical structure, the profiling its form and the factor of nonlinearity of static relations on the stress fields has been established. A homogeneous temperature field with a nominal value of 80°C creates fields of self-balanced stresses in an inhomogeneous rod. The components of normal stresses in this case reach 20-40% of the materials permissible resistance level. The presence of rod parts with a significant difference in the coefficients of thermal expansion in the composition enhances this effect. In the second, the stability analysis of an inhomogeneous I-rod with a variable width cross section was performed. The transition of the initial S-shaped bend to an unstable state is shown.
On longitudinal and transversal diffusion of carbon nanotubes
Authors: Rudyak V , Belkin A
Published: December 2021

In this work, the anisotropy of diffusion of carbon nanotubes in water was studied by the molecular dynamics method. Two models of nanotubes were used, their lengths varied from 4 to 31 nanometers. The first model is a nanotube with armchair chirality, the second is connected solid nanoscale rods. The behavior of various components of the velocity autocorrelation function of the nanotubes center of mass has been studied. It was established that the transverse component of this function has a negative region and a minimum point, in contrast to the average autocorrelation function, which decays monotonically. It is shown that the diffusion coefficients in the longitudinal and transverse directions can differ several times; the method proposed in this work was used to determine them. The effect of anisotropy increases with an increase in the ratio of the characteristic sizes of the nanotube. Using the Stokes - Einstein formula, the effective hydrodynamic radii of nanotubes have been determined. In all cases, the effective radius is significantly less than the tube length.
Monitoring the oxygen removal process at the final stage of melting steel
Authors: Berdiyarov B , Khojiev Sh , Nuraliyev O , Mirsaotov B , Mirsaotov S , Osmanov Z
Published: December 2021

This article deals with removing oxygen at the final stage of steel smelting in arc steel-making furnaces. It is shown that the remaining oxygen during crystallization forms floccules and significantly reduces the quality of the finished metal. During the subsequent metal processing by pressure on these floccules, the metal is torn apart and makes it impossible to obtain a steel sheet. Deoxidation is performed with expensive ferroalloys, and their consumption must be minimized. To achieve economic efficiency, it has been proposed to use recycled aluminum slag as a relatively inexpensive local deoxidizer. To optimize the deoxidizer consumption, a rapid analysis method was developed using the electromotive force (EMF) determination to determine the oxygen activity in liquid steel. As a result of the study, the composition, structure, and technological parameters of deoxidized steel were determined. The use of this technology in production will make it possible to obtain high-quality steel and improve environmental protection through secondary aluminum waste.
Cylinder sleeve of the internal combustion engine. Mathematical model of the deformation process
Authors: Gubin E , Andriushchenko S , Mochalin K
Published: December 2021

During the operation of internal combustion engines, deformation of the cylinder sleeve is possible, which causes its premature wear during the operation of the “piston ring – sleeve” pair. Imagine the sleeve as a two-stage hollow cylinder with forces applied to it, which cause deflection in the section. It can be assumed that if the greatest deformation of the cylinder is in the section of the application of forces, then with distance from this place it will decrease. At some distance from the point of application of forces, the deflection of the sleeve will be equal to zero. It is required to simulate a mathematical formula that would make it possible to evaluate the possibility of estimating the value depending on the basic geometric dimensions of the cylinder sleeve. A mathematical model of the deformation process of a hollow two-stage sleeve of an internal combustion engine has been developed, an analytical dependence has been obtained for the value of the “neutral” section depending on the main geometrical dimensions of the cylinder sleeve of the engine, a rather extensive analysis of the influence of various parameters on the value of the “neutral” section has been carried out.
Investigation of the characteristics of a marine diesel engine when running on fuel with a water additive
Authors: Andriushchenko S , Titov S , Yur G
Published: December 2021

Currently, environmental specifications of marine diesel engines become more stringent. There are two well-known and popular ways to improve engine environmental performance: the internal method is based on operation process improvement, as well as on the use of various fuel additives or air supply to the diesel cylinder. Another method is external (gas purification using catalysts and filters). The article considers one of these possible ways of reducing nitrogen oxides in marine diesel engines by using a water agent in fuel with various water phase dispersion degrees. The high-speed characteristics of the ship engine operation under various modes using “L” brand diesel fuel and emulsions are given. Studies have shown that when converting diesel from pure fuel to a microheterogenous emulsion (water inclusions’ diameter 5-10 microns), the concentration of NOx decreased by 1.4 times, fuel consumption increased by (4-5) g/(kWh), with an increase in the maximum combustion pressure by 0.7 MPa. The tests have confirmed the effectiveness of using a microheterogenous emulsion to reduce nitrogen oxide emissions.
Exploring the impact of similarity index on the accuracy of a phishing site detection model using machine learning
Authors: Danko O S , Medvedeva T A
Published: December 2021

In this paper, the problem of phishing site detection using machine learning is discussed. The main goal is to study the effectiveness of various binary classification models when extracting only lexical features from a URL. Special attention has been given to the analysis of features obtained from the domain by calculating the similarity index using the whitelist. After training and testing the models, accuracy metrics were calculated and the results were compared. The lexical features that have the greatest weight for the classification of URLs are highlighted, and the advantages and disadvantages of this approach are described.
Using the QR code as a means of automating the process of accounting for attendance at educational classes
Authors: Stupina M V , Anistratenko K V , Pazina L O
Published: December 2021

Nowadays, the technology of QR codes is one of the promising areas of development of the IT industry, which has found application in various industries, business areas, medicine, etc. In the field of education, QR codes are used to increase the interactivity of classes, provide additional multimedia content, conduct surveys and other control activities. This work presents the key features of QR codes, their architecture and main components. The use of QR codes in automating the process of accounting for students’ attendance is considered. A web application has been developed for teachers, the interface of which allows them to generate QR codes for academic disciplines. A mobile application with an integrated QR-code scanner was developed for students. All attendance data is recorded in the teacher’s electronic attendance register. A conceptual data model of the system is presented, as well as the main algorithms of its operation related to the generation and scanning of QR codes. The practice of using the developed system demonstrates the effectiveness of monitoring attendance data by promptly entering it into an electronic journal.
Application three-valued logic in symmetric block encryption algorithms
Authors: Abdullaev T R , Juraev G U
Published: December 2021

The issues of limiting the use of binary logic for the further development of science engineering are discussed. The effectiveness of the use of the ternary number system at this stage in the development of information technologies is substantiated and shown. A method is proposed for increasing the informational entropy of plaintext by adding random data using ternary logic in the process of symmetric encryption. To reliably hide the added random data, the first transforming function is proposed to choose gamming with a key.
Multiplicative knapsack injectivity as condition of effective unauthorized access protection
Authors: Osipyan V O , Zhuk A S , Lukashchik E P , Litvinov K I , Kh Bagdasaryan R
Published: December 2021

The mathematical modelling of data protection systems based on multiplicative knapsack is considered. In particular, development of cryptographic solution to hierarchic access control problem is represented. Previously in research the authors has formulated the requirements to knapsack in order to apply these to a hierarchic access control problem based on the requirements for similar models. Here in the article the possibility of practical implementation of the construction of such knapsacks is pointed. Based on special mathematical model for multiplicative knapsacks generalized sufficient condition of multiplicative knapsack injectivity is formulated and proved in the article. Known sufficient conditions of multiplicative knapsack injectivity are special cases of authors condition. The mathematical apparatus of additive knapsacks for building multiplicative vector is shown.
Virus signature detection algorithm
Authors: Zemlyanaya D , Boldyrikhin N , Svizhenko A , Yukhnov B
Published: December 2021

The purpose of this research is to develop an algorithm for finding virus signatures. The method of searching for virus signatures was analyzed to achieve this goal. A brief description of the Boyer-Moore algorithm was also considered. The result of the research is a new algorithm that optimizes the speed of finding virus signatures by scanning the beginning and end of the file, since these are common cases where viruses are located. The practical significance of this research lies in the development of an algorithm for finding virus signatures, which reduces the risk of infection of the operating system with viruses and provides the ability to quickly detect malware.
Identification algorithm for telecommunication systems with uncertain parameters of their vector of state stochastic model
Authors: Chub E G , Pogorelov V A
Published: December 2021

The described method of structure identification of the state vector of a telecommunication system stochastic model is based on a posteriori probability density approximation (APDA) by a system of a posteriori moments. An assumption of possible APDA approximation by a class of Pearson distributions resulted in a closed system of moment equations. Implementation of optimal non-linear stochastic object control techniques helped to solve the problem of structural identification. Introduction of the proposed approach into contemporary telecommunication systems will not impose additional requirements on the calculating equipment, thus making this method well-suited for a wide range of applications.
Investigation of the Application of Software Generator of the Speech–Like Interference to Protect Acoustic Information from Leakage through an Acoustic Channel
Authors: Korochentsev D A , Cherckesova L V , Revyakina E A , Goncharov R A
Published: December 2021

This work is aimed at developing a software tool for generating speech-like interference, which allows you to hide protected information from persons who do not have access to it. In the course of the work, the analysis of acoustic channels of information leakage was carried out, the choice of the stack of technologies used in the development of the software tool was justified. The developed software was tested with various types of speech-like interference, during which the type of interference used to protect information was determined.
Verification of the gauss’s law with the unknown parameters by the Kolmogorov criterion in the problems of railways electric supply
Authors: Lindenbaum T M , Ignatieva O V
Published: December 2021

Traction currents and voltages in the overhead railroad contact line hypothetically obey the Gauss’s distribution law. An algorithm for statistical modeling of the Kolmogorov distribution for the unknown values of the Gaussian law parameters has been developed. For a large number of the modeling program implementations, it has been shown that testing the hypothesis about the distribution law without taking into account the number of unknown parameters leads to an unacceptable increase in the criterion significance and a decrease in its power. The distribution of the Kolmogorov criterion is calculated with sufficient accuracy for two unknown parameters, which allows its wide practical use.
Intellectualization of the assessment of the development of information and communication means of data processing
Authors: Bochkov A P , Kuranova O N
Published: December 2021

Given the weak formalization and insufficient information support in the early stages of data processing tools development in information and communication technologies, the use of intellectualization mechanisms and the creativity of the researcher is highly relevant. Mathematical models, decision support systems are actively used to introduce intellectualization into the process of modeling development prospects itself through the use of fuzzy set models, fuzzy logic, opportunity theory and other disciplines focused on unlocking the intellectual, creative potential of the developer. With this in mind, the paper aims to develop a decision support system scheme to evaluate the development of data processing tools in information and communication technologies by activating the researcher’s intellectual capabilities through the use of his fuzzy reasoning, fuzzy structural modeling of development motives, visualization and schematization of the successive development of data processing tools. In the process of developing such a decision support scheme, a procedure for calculating the coefficient reflecting the ability of the considered variant of the appearance of data processing tools to further improvement was obtained. A system of membership functions is proposed, which is used to determine the influence of development motives on the qualitative characteristics of the ability of prospective data processing tools to further improvement. Specific examples are given to illustrate the developed methodological apparatus, in which the spacecraft of the Earth remote sensing system is selected as a data processing tool.
Modern Hash Collision CyberAttacks and Methods of Their Detection and Neutralization
Authors: Safaryan Olga , Cherckesova Larissa , Lyashenko Nikita , Razumov Pavel , Chumakov Vladislav , Akishin Boris , Lobodenko Andrey
Published: December 2021

This article discusses the issues related to the possibility of realization of collision cyberattacks (based on hash collisions). Since post–quantum cryptography has become relevant, classical cryptosystems do not provide the sufficient resistance to the modern quantum cyberattacks. Systems based on outdated hashing algorithms become vulnerable to cyberattacks with hash collision. As replacement for unreliable algorithms, such as various modifications of MD5 and SHA–1, new algorithms have been created, for example, SHA–3 standard based on the Keccak function and AES–based hashing. This article discusses modern collision cyberattacks and possible methods of their detection. Because of this study, theoretical description of cyberattacks with hash collision was considered; modern cyberattacks on hash collisions and possible ways of detecting and countering them (weak hash detection) are described; software tool that detects vulnerable and unreliable hash is implemented; software testing is carried out. Based on the conducted research, it can be concluded that the main advantages of implementing software tool are effective detection of vulnerable hash, the ability to generate new hash protected from collisions, convenient and user– friendly interface, small memory requirements and small size of the program code.
Analysis of the text of the FQP for automated standard control of documents
Authors: Kozyreva A , Nazarenko U , Berezhkov A , Nasyrov N
Published: December 2021

This publication focuses on underdevelopment the possibilities of machine learn-ing to help students prepare their final qualifying paper. Purpose of the study: present the possibilities of machine learning for processing final qualifying paper texts and checking them for compliance with the requirements. The article shows the possibilities of distributing work by topic, which can help students in finding materials on their topic and algorithms for extracting and analyzing text in Rus-sian for further analysis. The research is carried out on the basis of the CRISP DM methodology and describes in detail all the necessary research steps. The pa-per shows the process of extracting text from pdf and docx files; the necessary methods of text preprocessing for further analysis; and demonstrates the capabili-ties of machine learning algorithms using the example of LDA analysis.
Situational analysis model in an intelligent system based on multi-agent neurocognitive architectures
Authors: Nagoev Z , Pshenokova I , Nagoeva O , Kankulov S
Published: December 2021

An approach to the development of intelligent decision-making and control systems based on the hypothesis of the organization of neural activity of the brain in the process of performing cognitive functions is proposed. This approach, based on intelligent software agents with a developed cognitive architecture, is able to provide the process of extracting knowledge from an unstructured data flow, generalizing the knowledge and learning gained, to implement effective methods of synthesizing behavior aimed at solving various problems. A multi-agent model of situational analysis based on self-organization of distributed recursive neurocognitive architectures is presented. In particular, the basic principles of situational analysis based on multi-agent neurocognitive architectures are formulated and an algorithm for the preventive synthesis of the behavior of an intelligent agent aimed at avoiding negative situations for itself is developed. The performed computational experiment showed that on the basis of training the neurocognitive architecture by forming new agents-neurons and connections between them, a complex logical function of behavior control (in particular, situational analysis) develops (forms). The results of this study can be used to create intelligent decision-making and control systems for autonomous robots and robotic systems for various purposes.
A fully homomorphism encryption scheme based on LWR
Authors: Zhang Qixin
Published: December 2021

We believe that isomorphic encryption technology can provide strong technical support for users’ privacy protection in a distributed computing environment. There are three types of quasi-homomorphism encryption methods: partial homomorphism encryption, shallow homomorphism encryption, and full homomorphism encryption. homomorphism encryption methods have important applications for ciphertext data computing in distributed computing environments, such as secure cloud computing, fee computing, and remote file storage ciphertext retrieval. It is pointed out that the construction of the homomorphism encryption method is still in the theoretical stage and cannot be used for real high-density data calculation problems. How to design (natural) isomorphic encryption schemes according to algebraic systems is still a challenging research. This question discusses the problem of Learning With Rounding (LWR). Based on the difficulty of LWR, multiple IDs, and attribute categories, a fully homomorphism encryption method corresponding to an ID is proposed. In this paper, in order to reflect the effectiveness of the proposed method, we propose a homomorphism encryption technology based on the password search attribute.
Application loader in the RW. Ring platform
Authors: Medvedev S , Terleev V , Kashintseva V , Surinsky D
Published: December 2021

When developing decision support systems in agriculture, the task often arises of creating applications that include a large number of different components. These components can have dependencies on each other, so you need to load them in the correct order. This boils down to solving the classic topological sorting problem. However, in addition to the purely algorithmic part, the loader must correctly interact with the environment, which poses a large number of other technology-specific tasks for its developer. These are the tasks of obtaining and storing information about dependencies, ensuring that components are loaded in the user interface thread where necessary, as well as ensuring the most responsive program behavior so that loading an application does not annoy the user, as well as ensuring the extensibility of the decision support system without recompiling. This work is devoted to the description of the solution of these problems in the RW.Ring platform based on the .NET technological stack and intended for the development of such software systems.
On the development of a virtual test bench to assess sound absorption of materials in an alpha chamber
Authors: Cvetkov P , Leontiev V , Busko I
Published: December 2021

A description is given of a virtual test-bench (VTB) designed by engineering center of Peter the Great St. Petersburg Polytechnic University to calculate a sound absorption coefficient of various materials. Developed VTB differs from known programs in that it allows a sound absorption coefficient of various materials to be determined with minimum involvement of an engineer. This VTB differs from other programs also by using infinite elements jointly with finite elements, which increases adequacy of the discrete model being used, and also the configuration of the boundary of an alpha chamber being used. The known programs use various phenomenological mathematical models of porous materials such as Johnson-Champoux-Allard (JCA) model. The VTB is based on fundamental mathematical models and statistical energy analysis (SEA) that allow describing adequately the established or transitional processes of sound absorption and reflection by a porous material the properties of which are not homogenized. The value of this VTB, which is created on the basis of a VA One software complex supplemented by a set of files of boundary conditions, files of solvers’ settings, secondary finite element (FE) models, is that VTB allows standardized calculations to be performed to determine the sound absorption coefficient of a material with minimum involvement of an engineer and the obtained result to be submitted for detailed processing. Developed virtual test-bench enables determination of a sound absorption coefficient for various materials within the entire finite frequency range. The result of the calculation is displayed as a graph of dependency of the material sound absorption coefficient on frequency.