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Implementation of Non-Reflecting Boundary Conditions in the EFES Software Package for Solving Dynamic Contact Problems Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16 P. A. Radchenko, S. P. Batuev, A. V. Radchenko
The approaches to implementing the algorithm of non-reflecting boundaries are considered. A damping layer is introduced and two different approaches are discussed: stress damping and force damping. In each approach, different distributions of the damping coefficient over the layer thickness are used: linear, quadratic and cubic. It is shown that the force damping using quadratic dependence is the most
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Effect of Tempering on Structure and Properties of Plasma Surfacing of R2M9U High-Speed Tool Steel Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16
Using the methods of advanced materials science, the structural-phase states and properties of multiple plasma-surfaced layers of the R2M9U steel formed in a shielding-alloying nitrogen environment on the 30HGSA steel are studied after its subsequent triple high tempering. It is found out that a framework-type structure is formed in the surfaced layer, wherein the base element is iron and the atoms
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Comparative Studies of Circularly Polarized Light with Phase Shift in Sagnac and Mach-Zehnder Interferometers Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16
Phase shift plays a vital role in the analysis of interference and manipulation of polarization behavior in interferometric techniques. The Sagnac interferometer (SI) is initially studied due to its ability to withstand external environmental factors, including noise, temperature, and other interferences. However, the real impact of these factors is not demonstrated. To address this, comparative studies
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Regularities of Crack Development in Substructures of Cu–Al Alloys Near the Cracking Stability Threshold Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16 L. I. Trishkina, A. A. Klopotov, A. I. Potekaev, T. V. Cherkasova, V. I. Borodin, V. V. Kulagina, N. A. Tsvetkov
Using the method of transmission electron microscopy (TEM) of thin foils, the nucleation and propagation of microcracks in various structures of the plastic zone in the polycrystalline low-stability copper–aluminum alloys are studied in the vicinity of their structural-phase transformation into a crack-bearing state. The evolution of misoriented dislocation substructures (DSSs), formed in the low-stability
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On a State Transfer Mediated by a Central Spin Model Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16 M. Khurshudyan
Crafting a model possessing high-fidelity state transfer is one of the important topics discussed in the literature because of its wide applications. In this paper, we study a state transfer problem in a central spin model in the presence of external classical modulations to address some aspects of the Epstein effect. Experimental studies behind the Epstein effect demonstrate that a classical modulation/vibration
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Radiation Intensity of a Charged Particle in the Field of a Polarization-Modulated Electromagnetic Wave Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-16
A classical theory of radiation from a relativistic charged particle linearly accelerated by a high-intensity laser pulse with modulated polarization is developed via solving the equation of motion of a charge in the electromagnetic wave field. The formulas for calculating the spectral and angular characteristics of radiation, namely, the radiation intensity of a particle and its phase- and phase-angle
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Computational Fluid Dynamics Modeling of Gas Flow in Packed Bed of Separation Column Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 D. G. Vidyaev, R. V. Sharov, D. S. Yurinskii
The paper presents the estimate of hydrodynamic parameters of the gas phase motion at low-temperature fractionation of boron trifluoride in a packed column. The following parameters are detected: density and viscosity for reacting phases in the operational temperature range, gas velocity at the phase inversion point, Reynolds number, and retention capacity for the investigated types of packed beds
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Cooling System of Research Reactor Facility as Basis for Boosted Regression Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 M. K. Kublinskiy, N. V. Smolnikov, A. G. Naimushin
Production processes become more and more complex in terms of engineering implementation. During the operation of equipment for nuclear power plants or research reactor facilities, it is advisable to consider big data volumes, their change dynamics and deviations from the normal state. The IRT-T reactor facility at the School of Nuclear Science and Technology in National Research Tomsk Polytechnic
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Thermodynamic Modeling of Radioactive Graphite Heating in Nitrogen and Oxygenized Air Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 N. M. Barbin, S. A. Titov, M. R. Shavaleev, A. M. Kobelev, D. I. Terent’ev, L. N. Prytkov, I. V. Tikina
The paper investigates the structure and phase transformations of uranium to condensed and gaseous states during the treatment of radioactive graphite. Thermodynamic modeling of this process is performed in Terra program for the temperature range of 300 to 3600 K.
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Mathematical Simulation of Isotope Exchange in Flexible Manufacturing Systems with Electrochemical Phase Flux Reversal Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 L. I. Dorofeeva, A. P. Vergun, V. S. Balashkov
The paper deals with the mathematical simulation of separation systems with organic and inorganic ion-exchange resins in flexible manufacturing systems. The main parameters are identified for the effective operation of the separation system. The obtained experimental data and theoretical calculations provide the reduction of expenditures on isotope extraction and underlie a continuous separation process
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Alkaline Cleaning of Ion-Exchange Resins Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 A. E. Abdiyanov, D. G. Vidyaev, G. A. Nezamaev, S. N. Timchenko, I. A. Ushakov
The paper investigates the ion-exchange resin cleaning during processing of pregnant solutions obtained by in-situ leaching. Sodium and ammonium hydroxides and AMP and Purolite ion-exchange resins are used for cleaning. Regeneration of ion-exchange resins with and without preliminary cleaning is studied herein. The efficiency analysis of described processes is based on mass spectrometry, spectrophotometry
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Factor Analysis of Longitudinal Relative Deformations of Aluminum Under Stretching Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 A. M. Ustinov, A. A. Klopotov, Yu. A. Abzaev, A. S. Plyaskin, N. A. Trofimova, A. I. Babarykina
The paper presents results of correlation analysis of longitudinal strain values at different times during uniaxial tensile loading of flat specimens of technically pure A7-grade aluminum. The factor analysis allows distinguishing several factors responsible for the coordinated change of surface deformations at different deformation stages. Three characteristic zones are identified for the correlation
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Structural and Fatigue Features of Ti64 Alloy after Different Laser Shock Peening Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 A. N. Vshivkov, A. Yu. Iziumova, E. A. Gachegova, O. A. Plekhov
To select the optimal treatment mode of Ti64 alloy specimens with a stress concentrator, several laser shock peening (LSP) modes are studied. The effectiveness of the modes was determined by two criteria: indirect, based on the residual stress (RS) profile formed immediately after LSP (the depth of the layer with compressive RS and its maximum value), and direct, based on the number of cycles to failure
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Effect of Radiation Dose on the Deformation Behavior of the Single-Crystal Fe–10Ni–20Cr Alloy Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 K. P. Zolnikov, D. S. Kryzhevich, A. V. Korchuganov
A molecular dynamics study was carried out on the radiation damage and the onset of plastic deformation in the single-crystal Fe–10Ni–20Cr alloy exposed to different radiation doses under uniaxial tension. It has been shown that upon reaching a threshold radiation dose of ~0.020–0.025 dpa, the number of radiation-induced defects levels off. This behavior of the material is explained by the establishment
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Studying the Ultimate Strength and Service Life of Quartz Glass with Protective Coating for Space Vehicle Windows Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 S. V. Ovchinnikov, V. P. Sergeev, M. P. Kalashnikov
The paper focuses on the impact of an optically transparent protective coating of an AlSiN system on the short-time ultimate strength of quartz glass discs as delivered and after crater damage by impact particles simulating micrometeoroids. The statistical processing of the data discovers a negative correlation between the specimen ultimate strength and the crater damage. This allowed assessing the
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A Machine Learning Perspective for Vibration Sensing and Identification of Modal Parameters of Electromechanical Equipment Using a Mach-Zehnder Interferometer Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-15 Khalid Sabo Muhammad, Yuttapong Jiraraksopakun, Apichai Bhatranand, Abdullahi Usman
Vibrations in electromechanical machines pose a risk of performance deterioration and mechanical failures, stressing the need for precise all-weather vibration detection and identification of modal parameters for predictive and proactive maintenance. Using an experimental approach, a dataset of interferograms is generated from an optical sensor with labeled vibration amplitudes corresponding to frequencies
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Nanoparticles Generated in Magnetic Field by Laser-Induced Plasma Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-27 V. F. Myshkin, V. A. Khan, Tsailun Van, I. Yu. Zykov, D. V. Lychagin, S. N. Timchenko, A. S. Evstratenko, S. F. Balandin, S. A. Ogorodnikov
In certain conditions, plasma processes lead to the formation of a dispersed phase. A phase transformation is associated with the formation of a chemical bond and grouping of valence electrons of the surface and adsorbed atom, Pauli's principle being met. According to the experiment presented herein, nanoparticles generated from the plasma in laser-induced breakdown in a weak (80 mT) constant magnetic
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Specific Absorption Rate Reduction of CPW-Fed Metamaterial-Inspired Antenna for 5G Technology Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 M. Elhabchi, M. Bour
This paper presents a significant study of the influence of the electromagnetic field genertaed by a coplanar waveguide circular antenna loaded with a 3 × 3 array of the I-shaped metamaterial unit cell on people. The assessment is done through the simulation of the specific absorption rate (SAR), which quantifies the absorption rate of electromagnetic energy by the human body tissue. The standard limits
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Einstein-Maxwell Equations for Homogeneous Spaces Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 V. V. Obukhov, D. V. Kartashov
The paper studies the energy-momentum tensor components for admissible electromagnetic fields in a nonholonomic system given by the group operation in homogeneous spaces. Compact expressions are obtained for Maxwell field equations.
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Wave Isotope Separation in Super-Intense Centrifugal Fields Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26
The paper deals with waves in gas centrifuges generated by gas samplers. These waves can have a significant influence on the hydrodynamics of gas flows. In gas centrifuges, new physical mechanisms appear due to super-intense centrifugal waves. These mechanisms affect isotope separation in a mixed gas. This paper investigates a barodiffusion mechanism of isotope separation at different rotation velocities
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Influence of Annealing Temperature on Microstructure Parameters and Microhardness of Tantalum After Deformation by Rolling Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26
The characteristics of the relaxation and recrystallization processes in pure tantalum deformed by rolling at room temperature are studied. It is established that at 800°C the recovery processes are activated and nuclei of recrystallization grains appear. After 1000°C, an activation of primary recrystallization is observed, which, after annealing at 1200°C, involves the entire material volume. It is
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The Role of Nanoparticles in Radioactive Contamination of Area Surrounding Khujand in Tajikistan Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 M. N. Rakhmatov
The paper presents the elemental composition of soil and atmospheric aerosol samples collected on the right bank of the Syr Darya river in Khujand. The analysis is given to the distribution of the uranium and thorium decay series, 40K, and other induced radionuclides. The obtained results are compared to the data on the environment in south-central Tajikistan. It is shown that atmospheric nanoparticles
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Optimization of Fuel Droplet Sputtering and Combustion at High Turbulence Flows Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 A. S. Askarova, S. A. Bolegenova, Sh. S. Ospanova, L. A. Rakhimzhanova, A. Z. Nurmukhanova, N. A. Adilbayev
The paper presents simulation results of octane and dodecane burning at high turbulence flows in a combustion chamber, in which droplets are injected at different initial velocities. The proposed mathematical model describes the burning process. Dependences are suggested for the temperature distribution of the fuel combustion and CO2 concentration at different initial velocities of the droplet injection
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Calculation Procedure for Square Cascades Based on Cross-Section Variation of Partial Fluxes Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 S. S. Lubnin, V. A. Palkin
The paper proposes a calculation procedure for square cascades based on cross-sections of partial fluxes. The bees algorithm is used to achieve a constant cross-section for the stage feed flux. The optimization goal is determined as a residual sum of squares of the given stage feed flows calculated through cross-sections of partial fluxes. The paper describes the numerical experiment with germanium
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Automated System of Carrier-Free Lu-177 Separation from Ytterbium Target Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 V. A. Demidov, I. A. Ushakov, V. V. Zukau, E. A. Nesterov, D. G. Vidyaev, S. N. Timchenko
The paper presents an automated system of radiochemical extraction of carrier-free Lu-177 from the ytterbium target. This system is based on the Russian equipment and software and includes three levels. The automated system utilizes the Simple-Scada 2 system, database management system MySQL, OwenCloud and OPC server from OVEN and InSAT. Sensors, controllers and input/output modules are provided by
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Prediction of Optical Wave Phase Fluctuations in a Turbulent Atmosphere Based On Current Database Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 V. P. Lukin
Approaches to constructing algorithms for controlling adaptive optics (AO) systems based on prediction of evolutions of spatial and temporal distributions of phase distortions in the optical wave propagating in an atmospheric turbulence and generation of control signals for correcting wavefront distortions in real time are described. Main patterns of evolutions of phase distortions of optical waves
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Computed Tomography Based Stress-Strain Analysis of Heterogeneous Models of Rocks and Biological Tissues Using Unstructured Meshes Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 V. A. Levin, A. V. Vershinin, M. Ya. Yakovlev, I. O. Levchegov, A. A. Zhmurovsky
The article considers the problems in the numerical stress-strain analysis of heterogeneous models of rock samples and biological tissues. The information about the geometric structure of such models is usually obtained using computed tomography (CT). The construction of the unstructured hexahedral meshes (based on CT scan data) is used to reduce the problem dimension. Examples of estimating the effective
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Sharma-Mittal Quantum Discord in a Two-Qubit Heisenberg XXX Spin-1/2 Chain Under DM And KSEA Interactions Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 A. El Aroui, R. Ben hammou, N. Habiballah, M. Nassik
A two-qubit Heisenberg XXX spin chain is considered in the presence of Dzyaloshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions. The discord-like quantifiers, specifically, those of the Sharma-Mittal, Renyi discord and Tsallis quantum discord, are used to evaluate Non-classical thermal correlations in this system. Their explicit analytical expressions are found as a
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Simulation of Extrusion of High-Viscosity Pastes by a Piston Dosing Mechanism Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 R. M. Gadirov, A. V. Borisov, N. S. Trufanova, S. A. Artishchev, A. G. Loschilov
A theoretical study of extrusion of a paste consisting of a silver powder in a terpineol binder is performed, aimed at getting an insight into the system’s behavior and determining the optimal conditions of the dosing mechanism operation. The paste is treated as a non-Newtonian fluid, and its characteristic properties are taken from the experiment. The spatial distributions of its viscosity, motion
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Structure-Phase Status of the High-Entropy AlNiNbTiCo Alloy Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26 Y. A. Abzaev, Ž. Medić, M. Koptsev, R. S. Laptev, A. M. Lider, A. D. Lomygin, A. A. Klopotov
Results of investigations of the structural state of the AlNiNbTiCo high-entropy alloy (HEA) obtained by mechanical synthesis of pure Al, Ti, Ni, Co, and Nb metals for 30, 40, and 50 min are presented. It is shown that the AlNiNbTiCo HEA belongs to stable structures near the melting temperature. By the method of inverse convex hulls (InveseHubWeb), the temperature interval of structure stability equal
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Focusing of a Paste Flow Upon Exposure to an External Electromagnetic Field Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26
The feasibility of application of a ferromagnetic conductive cylinder nozzle to focus the fluid flow extruded by a piston dispenser is assessed in the present work. Based on the limiting cases of stationary and laminar fluid flows, it is shown that an electric field can be created between the fluid and the cylindrical nozzle due to the anomalous Hall effect in the cylindrical nozzle with a current
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Influence of Striker Rotation on the Process of Normal Interaction with Multilayer Barriers Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-26
The normal interaction of a steel striker with a composite metal-ceramic barrier is modeled numerically using the finite element method. The barrier consists of the following materials: boron carbide (B4C), aluminum, and orthotropic organoplastic. The behavior of metallic materials and ceramic B4C is described by an elastic-plastic model. The fracture criterion for metallic materials is the limiting
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Influence of the Aging Temperature on the Mechanical Characteristics of the Nanocrystalline Ti–50.9 at.% Ni Alloy Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-24 S. L. Girsova, T. M. Poletika, S. M. Bitter, K. A. Zheronkina, A. I. Lotkov
The influence of the aging temperature in the temperature range 300–500°C on the martensitic deformation response and mechanical characteristics of the Ti–50.9 at.% Ni nanocrystalline alloy with a grain/subgrain structure has been studied. It is shown that with an increase in the aging temperature, the size and spatial distributions of Ti3Ni4 particles inside the grain-subgrain nanostructure change
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The Influence of Ultraviolet Radiation Intensity on the Formation of Silver Nanoparticles by Cavitation-Diffusion Photochemical Reduction Russ. Phys. J. (IF 0.6) Pub Date : 2024-02-24 G. F. Kopytov, D. I. Shashkov, A. A. Basov, V. V. Malyshko, M. E. Sokolov, A. P. Storozhuk, A. V. Moiseev, A. M. Barysheva, N. V. Zubova, V. A. Isaev, A. A. Dorokhova
The effect of different intensities of ultraviolet radiation (UV radiation) on the formation of silver nanoparticles (Ag NPs) synthesized by cavitation-diffusion photochemical reduction is studied. It is found out that with a decrease in the UV radiation intensity, the average size of silver nanoparticles increases, while the scatter of Ag NPs diameters increases. It is also noted that with a decrease
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Structure, Phase Composition and Defect Substructure of High-Entropy Alloy Ribbon Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-31
The melt spinning technique is used to obtain non-equiatomic high-entropy alloy ribbon 80 μm thick. The X-ray phase analysis, scanning and transmission electron microscopies are used to study elemental and phase compositions and the defect substructure of the alloy ribbon.
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A Study of the Influence of the Beam and Field Parameters on the Terahertz Multiwave Cherenkov Generator Efficiency Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-30
The interaction of a relativistic electron beam with an energy of 280–1500 keV and electromagnetic resonances in a multiwave Cherenkov generator with a diffraction reflector is studied using a 2.5D hybrid code. The main calculations are performed with a 5 kA tubular beam current injected into an electrodynamic system with a diameter of 40 mm. The frequencies are varied within 358–368 GHz. The parameter
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Influence of Curvature Radius and Blade Channel Parameters on Coating Thickness Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29
Cathodic arc deposition of coatings onto the surface of products with a complex geometry (coupled turbine blades, integrally bladed disks) can be complicated by the problem of the coating thickness tolerance. This paper suggests experimental dependences between nonuniformity of the coating thickness synthesized by cathodic arc deposition and geometrical parameters of the blade channel, namely its length
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Impact of Different Weight Fractions of Zinc Oxide Nanoparticles on Polyaniline/Zinc Oxide Nanocomposites for Thermoelectric Applications Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 C. Vignesh, K. Vinoth, J. Emima Jeronsia, L. Chinnappa
PANI/ZnO nanocomposites are synthesised via the sol-gel method by increasing the weight fraction of ZnO. SEM observations show that all nanocomposites contain spherical particles. The particle nature and size of the nanocomposites are determined by XRD. The electrical conductivity of the nanocomposites increases from 18.6 to 29.3 mS/cm as the temperature rises from 30°C to 90°C, whereas the thermal
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Numerical Assessment of Electrical and Magnetic Characteristics of Elastomer Composites Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29
The paper presents algorithms for solving boundary value problems of electrical conductivity and magnetostatics for a cell of elastomeric composite materials (ECMs) by the finite element method. The algorithms enable one to determine both potential and strength of electromagnetic fields which are relevant in the development of the ECMs with specified functional properties. The values of electrical
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Structure of the Contact Layers of Steel and Their Deterioration in Dry Sliding Against Steel Under High-Density Electric Currents at Different Turn Ratios of a Supply Transformer Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29
The structural states of the contact layers of C235 steel in dry sliding against C45 steel are studied under a high-density alternating electric current. A sliding electrical contact is made in the secondary winding circuit of a power transformer. The electrical conductivity of this contact decreases with a decrease in the turn ratio. At the same time, the wear resistance and the current density corresponding
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Electron Microscopy of High-Speed Steel/30HGSA Steel Interface Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 Yu. F. Ivanov, V. E. Gromov, A. I. Potekaev, A. S. Chapaikin, A. P. Semin, T. P. Guseva
The paper presents results of transmission electron microscopy of the plasma coating/substrate interface. Its elemental and phase compositions and defect substructure are investigated. The high-speed steel R18-Yu coating is deposited in argon medium onto the type 30HGSA steel substrate high-tempered for several times. It is shown that both the coating and substrate are mutually alloyed. Primarily the
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Characterization of the Spatial Atomic Density Distribution in Gas Jets from Three Different Nozzles Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29
The spatial atomic density distribution in a gas jet can be controlled by nozzle geometry. In the present work, argon gas jets from conical, slit, and cylindrical nozzles with the same inlet nozzle sizes are simulated using commercial fluid software (ANSYS Fluent). The results obtained indicate that the cylindrical nozzle produces a radial distribution with the profile similar to a Gaussian function
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Upset Forging Temperature Effect on Structure and Tribological Properties of Sintered Al–7Fe–38Sn Alloy Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 N. M. Rusin, A. L. Skorentsev, V. E. Likharev
The paper focuses on upset forging of the sintered Al–7Fe–38Sn alloy in a closed mold and the process temperature, both affecting its structure and tribological properties. The Al–7Fe–38Sn composite consists of the hard (Al3Fe) and soft (Sn) phases in 17 and 20 volume fractions, respectively. It is found that ≤250°C forging has a negative effect on the composite plasticity, whereas at 300°C, the plasticity
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Optical Properties of the Dielectric Coating Manufactured by an Additive Method Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 M. M. Mikhailov, A. N. Lapin, S. A. Yuryev, S. A. Artishchev, V. A. Goronchko, N. S. Trufanova, O. A. Mikhailova, D. S. Fedosov
The possibility of manufacturing a thermal control coating has been studied, and the method of its deposition from PD-12 dielectric paste using a Voltera V-One printer has been considered. The morphology, surface roughness, phase structure, diffusion reflection spectra in the range of 200–2500 nm, integral sunlight absorbance, and IR spectra in the range of 400–4000 cm–1 of the coating are investigated
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Effect of Nano Filler on the Mechanical, Thermal, and Free Vibration Behavior of a Jute Polymer Composite Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 S. P. Singh, C. K. Hirwani
Jute/epoxy/nanosilica (JES) composites have been fabricated with varying amounts (0–4 and 5%) of nanosilica in an epoxy matrix. It is observed from the test that the addition of the nanosilica filler up to 3% to the composite improves the thermal, mechanical, and free vibration behavior of the JES composites, while adding more nanosilica shows the adverse effect. Small amounts of nanosilica in composite
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Dynamic Evolution of Space Objects in the GEO Region and its Vicinity Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-29 I. V. Tomilova, A. G. Aleksandrova, N. A. Kucheryavchenko, V. B. Aleksandrov
An analysis of the evolution of the dynamic parameters of the objects listed in the European Space Agency (ESA) report “Classification of Geosynchronous Objects” (Issue 20) and the objects of geostationary region and its vicinity observed with a Zeiss‒2000 telescope from the Terskol Observatory of the Terskol Branch of the Institute of Astronomy of the Russian Academy of Sciences is presented. This
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Performance Enhancement of a Hybrid Solar Still/Photovoltaic System with Mirror Reflectors, Automatic Water Cooling, and Feed Water Preheating Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-27 P. Yadav, B. Singh, Subedar, S. Kumar, S. P. Singh, S. K. Singh
The hybrid system integrating a solar photovoltaic (PV) module and a passive single-slope solar still (PSSSS) has been designed and tested. The PV module, equipped with mirror reflectors and automatic water cooling, is aimed to enhance the solar radiation input and reduce the module surface temperature. Preheated feedwater maintained a constant basin water level in the PSSSS. April and May 2022 experiments
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A Study of the Plasma Jet Formed by the Glow Discharge in an Air Flow in the Electrode System of a Gliding Arc Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-27
The formation of a plasma jet by a glow discharge in an air flow in the electrode system of a so-called gliding arc is considered at an average discharge current of 100 mA and an air flow rate of 0.1 g/s. The displacement of a negative glow region over the cathode surface is analyzed using a sectioned plane cathode. A method for the plasma jet diagnostics by measuring the charged particle current on
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Effect of Ultrasonic Dispersion on Electrophysical Characteristics of Composites Based on Carbon Nanotubes Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-27 A. S. Chervinskaya, O. A. Dotsenko, V. S. Mereshkina, A. S. Kachalov, E. Yu. Korovin, V. I. Suslyaev
The composite material based on multi-walled carbon nanotubes and a water-dispersed paint has been obtained. Low-frequency spectroscopy showed that ultrasonic dispersion of the multi-walled carbon nanotubes (MWCNTs) in the water-dispersion paint leads to a non-monotonic dependences of the complex dielectric constant and electrical conductivity of the composite on the processing time. This behavior
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Microstructure, Mechanical Properties and Fracture of Austenitic Steel EK-164 After Warm Deformation at 600–900°C Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-02 S. A. Akkuzin, N. A. Polekhina, A. V. Kim, I. Yu. Litovchenko, K. V. Spiridonova, V. M. Chernov
The effect of the modes of thermomechanical treatment (TMT), involving warm plastic deformation (e = 2) by rolling in the temperature interval of 600 – 900°C, on the austenitic steel microstructure is studied. Using the methods of transmission electron microscopy, it is shown that this plastic deformation results in the formation of a highly defective fragmented microstructure with a high density of
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Method for Determining the Crack Resistance of a Square Section Beam Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-02 E. E. Deryugin, A. V. Pazhin
Simulation of a 3-point bending of a square beam located on supports by an edge but not on a flat side is carried out. The calculation is based on the fundamental relationship between the specific fracture energy G and the change in the sample compliance during crack propagation. In the ANSYS system, the dependence of the compliance on the crack length was obtained using the ORIGIN program. The derivative
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Deformation Stages of Austenitic Cast SteeL 60Cr24NMn16 Under Different Boundary Loading Conditions Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-02
A method for determining the characteristics of strain hardening of a material using the standard OriginPro program is proposed. The method allows the first and second order derivatives to be determined automatically at each point of the experimental loading diagram. The first order derivative is the strain hardening coefficient, and the second-order derivative determines the reduction rate of the
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Features of the Structure Evolution and Phase Transformations During Annealing of the VT22 Titanium Alloy Depending on the Initial State Russ. Phys. J. (IF 0.6) Pub Date : 2024-01-02 E. V. Naydenkin, I. V. Ratochka, I. P. Mishin, O. N. Lykova, O. V. Zabudchenko
Studies have been carried out of the influence of annealing in the temperature range of 723–873 K on the evolution of the structural-phase state and mechanical properties of the VT22 titanium alloy depending on the method of its pretreatment (by all-round pressing and radial-shear rolling (RSR)). It has been shown that annealing of the alloy after all-round pressing leads to the development of phase
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S-Parameters of Coaxial Adapters with Dielectric Beads Made of “Rimamid” Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29 E. V. Khoroshilov, N. D. Malyutin
The empirical frequency variations of the complex dielectric permittivity of Rimamid 200, Ultem PEI 1000 and Rexolite 1422 polymer materials in the range from 0.1 to 32 GHz are presented. The feasibility of employing Rimamid 200 as a microwave material is confirmed by examining S-parameters of the in-series PK2-18-01R-01R and PK2-50-05R-05R-05R coaxial adapters having identical beads fabricated from
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Thermal Cyclic Tests of TiAlC/YAlO Coating Deposited onto γ-TiAl Alloy Surface Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29 A. A. Maslov, A. Yu. Nazarov, R. S. Esipov, M. S. Syrtanov, A. A. Nikolaev, K. N. Ramazanov
The paper studies the double-layer coating consisting of the Y–Al–C sublayer and external Y–Al–O ceramic layer obtained by vacuum-arc deposition for the protection of the VTI-4 (Ti49–11Al–40Nb) intermetallic alloy from oxidation at 750°C. The coating degradation mechanism and its chemical composition are studied after thermal cyclic tests. Test results show the stability of the double-layer coating
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Dislocation Nucleation Centers of Surface Martensite Formation with Habit Planes in the Vicinity of {12 14 17} Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29
The first stage of the surface martensite formation with a habit plane close to {12 14 17} is interpreted in terms of the dynamic theory of martensitic transformations. Based on the analysis of the elastic field calculations, the dislocation centers of crystal nucleation are identified. The principal role is attributed to the dislocation loop segments oriented along the <12 1> directions.
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Wideband TEM-TM01 Mode Transducer Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29 I. K. Kurkan, N. M. Bykov
An approach to widening the band of a TEM-TM01 mode transducer and the results of numerical simulations of two transducers, whose designs involve the concepts of this approach, are presented. One operates in the Ka-band and the other covers the S-band and partially the C-band. The efficiency level to define the operating band is assigned as 0.95. It is shown that the operating band could be extended
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Heat Resistance of Vacuum Arc Deposited TiAl Coatings on VTI-4 Alloy Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29
The paper studies intermetallic coatings based on the Ti–Al system obtained by plasma-assisted vacuum-arc deposition. The coatings are deposited by three different techniques to gain the different elemental and phase compositions. The study of the oxidation kinetics shows that the coating with the gradient aluminum distribution possesses the best oxidation resistance. It is found that after 500 hours
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Physical-Mechanical Properties of the Ti–Ni–Nb–Si-Based Surface Alloy Synthesized on the TiNi Substrate by the Electron-Beam Method Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29 F. A. D’yachenko, V. O. Semin, M. G. Ostapenko, L. L. Meisner, A. B. Markov, E. V. Yakovlev
The physical-mechanical properties of the Ti–Ni–Nb–Si-based surface alloy formed on the TiNi substrate using the electron-beam synthesis have been studied. The surface alloy has ~2 times higher values of the microhardness and elastic modulus than the TiNi-substrate. On the contrary, the values of the elastic-plastic parameters are close to those of the substrate. It was found that at a depth of ≤250
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Simulation of the Mechanical Behavior of a Dental Implant in Bone Tissue Under Shock Wave Treatment Russ. Phys. J. (IF 0.6) Pub Date : 2023-12-29 A. Yu. Smolin, G. M. Eremina, I. P. Martyshina
Dental implants are becoming an increasingly important part of modern dental treatment. Developing an optimal implant surface design can improve osseointegration. Promising to increase the rate of osseointegration is the use of extracorporeal shock wave therapy, which has proven itself for the treatment of fractures, bone defects, and bone tissue regeneration during surgery and arthroplasty. This work