bluuebunny/crossref_metadata_2025_split huggingface dataset:
Measuring setup for determining the parameters of materials that absorb radio waves
Authors: Samoylov A G , Friedman O A 
Published: December 2022

Abstract
A measuring complex for determining the coefficients of reflection and transmission of electromagnetic radiation through radio-absorbing materials has been developed and manufactured. Measurements are made by the direct method by comparison with a reference material. When measuring the transmission of radio waves through an absorbing material, the standard is air, and when measuring the reflection of radio waves, a sheet of steel is used as the standard. When measuring the transmission of radio waves through an absorbing material, the standard is air, and when measuring the reflection of radio waves, a sheet of steel is used as the standard. The installation uses replaceable horn antennas and standard microwave generators. The distance necessary for carrying out measurements in the far field of antenna radiation was determined and the maximum sizes of the irradiation spots of the measured materials for various frequencies in the range from 1 to 20 GHz were calculated. A measurement setup that is efficient in terms of the “price-quality” criterion is made, easy to maintain and does not require computational work.
Experience in studying natural fractals
Authors: Belashev B Z 
Published: December 2022

Abstract
We investigate the fractal characteristics of diverse natural objects and discuss their possible applications. Fractal dimensions of the suture lines of ammonite shells, granite textures, the portions of the river network in the Onega and the Ladoga lakes basin and the multi-fractal spectra of varved clay sedimentation in these lakes were calculated. It is shown that the fractal dimensions of the suture lines of shells can be used to identify ammonites. Fractal textures of granites can be applied to improve their aesthetic perception. The fractal parameters of the river network and the sedimentation regimes in the lakes may be related to tectonics.
Improving the wear resistance and durability of cultivator tools
Authors: Tulaganova Laziza , Yunushuzhaev Saidakbarkhyzha , Juraeva Gulchehra 
Published: December 2022

Abstract
In this article the existing methods to improve the wear resistance of working elements of agricultural machinery are highlighted and analyzed in detail. The relevance of this problem for domestic producers and consumers of agricultural machinery is the fact that the service life of many elements of domestic agricultural machinery is 1.2-2.0 times lower than similar imported machines. This means that imported machines operate twice as long before repair than our machines. The paper analyses the causes of wear and loss of the cultivator tines’ serviceability. The wear factors causing gradual changes in the size and shape of the working tools, which subsequently lead to the loss of operability, are considered. The data obtained as a result of their study, can be used in the development of technological processes to restore the working bodies of tillage machines.
Development of an equalizer using singular value decomposition
Authors: Lantsov V N , Melnik I S 
Published: December 2022

Abstract
The problems of wireless communication systems are investigated. A model and hardware implementation of a system for estimating and correcting amplitude distortions of a radio signal using an algorithm based on Singular Value Decomposition (SVD) has been developed. The analysis of the efficiency of the system when processing the LTE signal is performed. The model was obtained in the Matlab system with modeling the propagation environment, as well as time and frequency tuning blocks using the LTE Toolbox library. FPGA resources with hardware implementation are estimated. Testing the signal-to-noise ratio of the two-antenna equalizer revealed its advantage over the single-antenna configuration by 2.8 dB.
Determination of the degree of microbiological damage to the «Cement Concrete - Steel Reinforcement» system
Authors: Strokin K B , Novikov D G , Konovalova V S 
Published: December 2022

Abstract
The degree of corrosion damage by microorganisms to the concrete wall of the basement is investigated. The biofilm on the surface of the concrete wall under study is formed by micromycetes Aspergillus niger, bacteria Bacillus subtilis, Actinomycetes, nitrifying bacteria Nitrosomonas, lactic acid bacteria Lactobacillus and sulfate-reducing bacteria Desulfovibrio. The waste products of microorganisms consist of organic acids secreted by micromycetes of Aspergillus niger, ammonium ions, carbonate-, nitrate-, sulfide-ions secreted by bacteria. To establish the corrosion state of steel reinforcement in biodegradable concrete, the electrode potential was measured. The established values of the surface potential of steel reinforcement are in the range -351 ÷ -376 mV. This suggests that the probability of local corrosion of steel reinforcement in a biodegradable concrete wall is strong. It will take about 20 years to achieve an aggressive concentration of organic acids at the surface of steel reinforcement in biodegradable concrete with a layer thickness of 5 cm. However, in conditions of constant moistening of the concrete surface, this period is reduced to 10-11 years. The predicted rate of local corrosion of steel reinforcement in concrete exposed to microorganisms is at least 0.2 mm/year. It was found that the depth of concrete destruction under the influence of microorganisms, mainly micromycetes Aspergillus niger, for 20 years is 1.3 cm; for 50 years is 2.1 cm.
The leak detection process modeling
Authors: Makarov V A , Korolev F A 
Published: December 2022

Abstract
The paper describes formalized description concept of the expiration gas process through product manufacturing defects in the control of tightness: Model Internal description based on the use of parameters of circuit theory and mathematical model of the external description made by means of functional expansions obtained on the basis of mathematical models experimental research of the implemented software package external description. A dynamic model of the outflow of gases through product defects is presented by the Wiener-Voltaire equations. The proposed method for studying the outflow of gases through product defects consists a simulation object whose input is subjected to an external action with constant other variable parameters and registration of the output signal. The experimental data are compared with the results of theoretical calculations based on the molecular model of the outflow process.
Stationary deformation of cylindrical shells with viscoelastic filler
Authors: Safarov I I , Teshaev M X , Boltayev Z I , Nuriddinov B Z , Ruziyev T R 
Published: December 2022

Abstract
The task of determining the dynamic response of plates and shells to moving loads is very relevant. The purpose of this work is to study the stationary deformation of infinitely long cylindrical shells with viscoelastic filler when moving along the axis of the shell of a wave of normal pressure with up to resonant velocity under the influence of normal moving loads. The paper presents a mathematical formulation of the problem, developed methods of solution and obtained numerical results. The solution methods are based on the joint application of the integral Fourier transform in the axial coordinate and the decomposition of all given and desired values into Fourier series in the angular coordinate. An effective algorithm for solving the problem has been developed and implemented on a computer. It is established that with the distance from the point of application of force along the circumference of the voltage for all considered cases, the sign changes. If the connection is one-sided, then tensile stresses arise, and the shell will detach from the filler. It has also been found that changes in the stiffness and rheological properties of the filler in the considered range have little effect on the length of the contact zone.
Study of heat transfer in models of FCC, BCC, SC and DEM porous structures with different porosities
Authors: Soloveva O V , Solovev S A , Talipova A R , Shakurova R Z , Paluku D L 
Published: December 2022

Abstract
In the present work, we investigated the effect of the geometry of the open cell foam material on the value of the pressure drop and heat flux. We create models of porous media with an ordered (FCC, BCC, SC) and disordered (DEM) structure with different values of material porosity: 0.7; 0.75; 0.8. Numerical modeling was carried out in the ANSYS Fluent software (v. 19.0) for various air flow velocities. At material porosities of 0.7 and 0.75 there is a noticeable increase in pressure drop in BCC and FCC packings, respectively. This is due to the features of creating the geometry of these packings. At material porosity of 0.8, the largest pressure drop corresponds to the packing of FCC cells. The structures show approximately the same heat flux value at air flow velocities of 0.01 and 0.05 m/s. At material porosity of 0.7 at velocities of 0.25-1.25 m/s, the largest values show the BCC packing. At material porosities 0.75 and 0.8, the values above correspond to the packing of FCC cells. The lowest heat flux values in SC cell packaging are observed at all investigated porosities. Also, the SC packing has the lowest pressure drop values and, therefore, the highest energy efficiency values.
Analysis of the impact effect of a piece of cotton with a flat surface with a multi-sided grates slope
Authors: Djuraev Anvar , Sayitkulov Sardor , Rajabov Ozod , Kholmirzaev Javlon , Haydarov Bakhtiyor 
Published: December 2022

Abstract
In the cotton ginning unit recommended in the article, the impact effects of multi-faceted gutters on flat sloping surfaces of cotton pieces in large waste ginning zones have been theoretically studied and connection graphs have been constructed. The results of the numerical solution of the problem, based on the analysis of the obtained analytical solutions, recommended the appropriate values of system parameters to increase the efficiency of cleaning cotton from large wastes in all three zones of the cleaning unit.
Morphological properties and atomic crystal lattice of solid carbonaceous objects
Authors: Rossokhin A V , Lopatin O P , Pushkarenko N N , Alatyrev S S 
Published: December 2022

Abstract
Diesel particulate matter (DPM) is an area of concern from an environmental point of view due to its functionality to settle in the respiratory channels when inhaled, cause inflammation in the respiratory tract, accumulate carcinogenic compounds, and adversely reflected the cardiovascular functions, thus causing excess mortality. DPM consists of an agglomeration of a numerous unions of preimages germ structures, spherical in the form of turbostratic carbon. Part of the DPM contains partially oxidized polyaromatic compounds C and H with a ring structure (PAH).
Mathematical model for pointing and holding the energy signal of a solar space power plant
Authors: Barkova M E , Zhukov A O , Kartsan I N , Klimov D I , Kuznetsova V O 
Published: December 2022

Abstract
One of the main problems of solar space power plants is the high-precision guidance and direction retention of the energy transmission device. High-precision guidance and retention of an energy signal requires the development of both the guidance and retention system as a whole, and the mathematical apparatus for its description. The article proposes a mathematical description of the pointing and holding method through continuous scanning.
Experimental study of pressure loss in hybrid cooling tower with finned tube radiator
Authors: Kharkov V V , Madyshev I N , Kuznetsov M G , Galimova A T , Sagdeev A A 
Published: December 2022

Abstract
The paper deals with the problem of enhancement of cooling of recycled water in industry. The authors developed a new design of a hybrid cooling tower with a fill pack consisting of inclined-corrugated contact plates and a tube radiator. The water flow during the cooling process flows inside the radiator to avoid direct contact with air, preventing the biofouling process. In addition, the external surface of the tube radiator is modified by finning for heat transfer intensification. The purpose of the work was an experimental study of the pressure losses in the developed hybrid cooling tower. The relationship of the pressure drop through the dry fill pack from the average air velocity was determined. The maximum increase in hydraulic losses for the dry fill pack with finned tubes of the radiator is less than 4.5% at the average air velocity of 7 m/s compared to the smooth tubes. Furthermore, it was found that when the wetting density is less than 28.3 m3/(m2·h), a drift of water droplets from the hybrid cooling tower can be decreased.
On the determination of the elastoplastic state of a plane made of an anisotropic material with an elliptical hole
Authors: Derevyannykh E A , Maksimov A N , Morozova N N , Nikitin A V , Yaruskina E T , Samsonov A M 
Published: December 2022

Abstract
The elastic-plastic position of a plane made of an anisotropic material with an elliptical hole is considered. Anisotropy is the ability of a crystal to express different qualities in different directions. The presence of this quality in its simplest form can be observed only in single crystals. In polycrystals, the anisotropy of the body is basically (macroscopically) unable to be expressed in any way due to the random orientation of the microcrystals, or it does not manifest itself at all, except for special cases. With an ordered arrangement of chemical particles, the forces of interaction between them and the interatomic distances turn out to be unequal, and this is precisely the reason for the anisotropy of crystals. Another reason may be the asymmetry of its molecules. The material of the work is an integral element of the task of studying the effect of anisotropy on the stress-strain state of various structures and bodies.
Viscometer for investigating the viscosity of magnetic fluid media
Authors: Bolotov A N , Novikova O O , Novikov V V 
Published: December 2022

Abstract
The rational application of magnetic fluids in various technical systems requires their stability analysis, hydrodynamic particle size, dissipative processes in the colloid control. The existing viscometers do not fully meet all requirements, in particular, they do not allow research in a magnetic field of given magnitude and certain topography. It is proposed to determine rheological properties of magnetic fluids using rotary viscometer, in which two measuring gaps are structurally designed and filled with studied fluid, which is important for calculating characteristics of low viscosity magnetic media. The device design implements practically homogeneous magnetic field, varying within wide range and directed perpendicular to liquid shear stress. The device allows to steadily maintain shear rate in medium under study, and to determine viscosity with a sufficiently large change. A small magnetic fluid volume is required to estimate rheological characteristics. The accuracy of measurements of the internal friction force, device heating temperature, coaxial cylinders rotation speed and magnetic field inside investigated medium meet the requirements of international standards. Laminar fluid flow process in the device gap is described mathematically. This made it possible to justify the construction geometrical dimensions in order to increase the measurements and determine rheological properties of low-viscosity magnetic materials. The formulas for calculation of Newtonian fluid viscosity coefficient, shear stress and shear rate based on experimental data were obtained.
Vibration anode-abrasive polishing of channels of small cross section
Authors: Trifanov V I , Nikitina L N , Saraeva K V , Malizhonok D I , Trifanov I V 
Published: December 2022

Abstract
The mechanism of anodic dissolution of microroughnesses in the combined method of anodic-abrasive vibratory polishing with magnetic-abrasive electrically polarized charged grains of channels of pipes of small cross section made of non-magnetic materials is presented. Materials that can be used as magnetic-abrasive composite grains such as Fe3C, FeB, FeB2, etc. or magnetic NbC-Fe modified with graphene, carbon nanotubes, or a combination thereof have been selected. A passivating electrolyte used in this combined method of vibration anode-abrasive polishing, for example, 3% NaNO3 + (3-6)% Fe3C, is proposed. The article shows the developed scheme of the process of combined magnetic-abrasive polishing and describes the process itself. The value of the allowance to be removed can be estimated from the proposed formula for calculating the removed layer of microroughness in the joint electrochemical process of polishing the channel surface with stationary and pulsed currents flowing in the electrolyte flow.
Mathematical modeling of the liquefied gases hydrates formation
Authors: Shostak Nikita , Zaporozhets Evgeny 
Published: December 2022

Abstract
A model of the formation of hydrates in the system of phase states of liquefied gas - water (ice, liquid, vapor), which is in a stratified state or in the form of emulsions, is presented. The relationship between the amount of liquefied gas components transferred into clusters and remaining in the environment is described. The features of the kinetics of the hydrate formation process are reflected. Using the developed mathematical model of the formation of hydrates of single- and multicomponent liquefied gases, it is possible, in a first approximation, to determine the thermobaric parameters, the basic properties and characteristics of the process, which include molecular (molar mass, density and number of moles of hydrates, as well as gas and water in it) and energy (hydrate formation in liquefied gas - water systems) parameters.
Approach to assessment of thermodestructive resistance of polymer-containing finishing building materials
Authors: Chernushevich Elena , Shirinkin Pavel , Bezborodov Yuri 
Published: December 2022

Abstract
The paper presents the review results of the conformity assessment existing system of finishing building materials with safety requirements. It is noted that the existing assessment methods do not take into account the change in the properties of finishing building materials in the temperature range from 40° C to the temperature of their ignition / combustion / smoldering. The aim of the study is to substantiate the approach and develop a method for assessing the thermal destructive resistance of finishing building materials. In this work, a study of the thermal destruction of finishing building materials was carried out, the dependences of the qualitative and quantitative composition of thermal destruction products on temperature were established, and the influence of temperature and time on the dynamics of thermal destruction was determined. On the basis of the data obtained, the criterion of the thermal destructive resistance of finishing building materials was substantiated, a method of assessing the thermal destructive resistance of finishing building materials was developed and their classification was proposed. The developed methodology and classification of finishing building materials can be applied when assessing the fire hazard of finishing building materials; when preparing proposals for regulatory documents and regulatory legal acts with the aim of safer use of finishing building materials; when modeling the development of hazardous fire factors, allowing to take into account the effect of thermal destruction products.
Optimization of wire drawing process in terms of rheological characteristics of stretching material and refinement of die hole geometry
Authors: Khaimovich Irina , Khaimovich Aleksandr 
Published: December 2022

Abstract
The article discusses the improvement of the analytical method for calculating the wire drawing force, taking into account the rheological properties of the material being pulled and clarifying the geometry of the die hole, provides a new analytical model for calculating the drawing force, describes the algorithm for calculating the drawing force, analyzes the results of modeling the drawing process for round products.
Influence of the process parameters of incremental forming of personified implants of the cranial bones on their geometry
Authors: Erisov Yaroslav , Nikolaenko Andrey , Petrov Ilya , Surudin Sergei , Kolsanov Alexandr 
Published: December 2022

Abstract
This work, on the basis of experimental data, establishes a relationship between the incremental forming process parameters and the accuracy of the resulting geometry of personalized implants of the cranial bones. The authors carried out a qualitative and quantitative assessment of the values of the maximum deviation, mean average deviation and standard deviation. It was determined that the use of two passes with incremental forming does not provide an increase in the geometric accuracy of the obtainable implant. The accuracy of the obtainable products increases with a reduction in the step of movement of the deforming tool during incremental forming.
Surface saturation monitoring of forming products from titanium alloy VT20 with additives
Authors: Gadalov Vladimir , Vornacheva Irina , Luchinovich Anastasia , Loparev Dmitry , Scherbakov Alexander , Malikov Vladimir , Sokolova Viktoriia 
Published: December 2022

Abstract
In the publication, the saturation of the surface of a large size of stamped articles made of VT20 alloy with interstitial impurities and the formation of non-metallic compounds on it were investigated. The process of gas saturation in several directions depending on external parameters: heating temperature, medium, holding time is analyzed.
Methods for studying the optical properties of transparent conducting oxides synthesized on the basis of tin dioxide
Authors: Zinchenko Timur , Pecherskaya Ekaterina , Gurin Sergey , Kozlov Gennady , Zhurina Angelina , Shepeleva Anastasia 
Published: December 2022

Abstract
For transparent conducting oxides, the most important characteristics are electrical and optical parameters, which are interconnected. The article presents a study results of the optical properties of transparent conducting oxides based on tin dioxide obtained by spray pyrolysis. To study the transparent conducting oxides parameters, the method of pointwise unconditional minimization and the Tauc model were used.
Comprehensive study of changes in the phase composition of copper-aluminum conductors during heating
Authors: Yu Pariyskaya A , Mokryak A V , Pyankova L A 
Published: December 2022

Abstract
Changes in the microstructural characteristics and phase composition of copper plated conductors CCA-20 in the temperature range of 100-600 °C were studied by XRD and SEM methods. Fiducial markers for determining the temperature of exposure to conductors are the appearance of the Al2Cu phase at the phase boundary of the conductor at temperatures above 300 °C and the existence of the Al4Cu9 phase in the temperature range of 300-400 °C.