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Experimental and Numerical Investigations of Composite Plates Under Impact Load Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 S. P. Batuev, A. V. Eremin, P. A. Radchenko, A. V. Radchenko
The paper investigates the normal interaction between the steel striker, carbon fiber and aramid fiber reinforced plastic plates at a speed ranging from 166.6 to 184.2 m/s. A series of physical and numerical experiments with impact load is conducted to design a mathematical model and numerical algorithm for the composite plate. The behavior and fracture of composites are described by the elastic-brittle
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Influence of Silver Ion Content on Nanoparticle Size Obtained by Cavitation-Diffusion Photochemical Reduction Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 D. I. Shashkov, G. F. Kopytov, A. A. Basov, V. V. Malyshko, E. V. Barysheva, M. E. Sokolov, A. V. Moiseev, E. E. Esaulenko, N. D. Shapkin, A. N. Korzhov, V. A. Isaev, A. A. Dorokhova
Photochemical reduction is used to develop many methods of creating biologically active substances and materials consisting of silver nanoclusters, which makes them relevant for science and technology, including different trends in biotechnology, catalytic systems, label-free quantification, metasurfaces and nanohybrid composites. The paper presents the silver nanoparticle (AgNP) technology based on
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Influence of the Cross-Sectional Area of the Metamaterial Structural Elements on the Twisting Motion Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 L. R. Akhmetshin, I. Yu. Smolin
A mechanical metamaterial is considered using mathematical modeling and computer simulation. Its structure consists of tetrachiral elements providing a non-conventional behavior under uniaxial tension/compression. The deformation behavior of the metamaterial is investigated on its solid computer model using the finite element method. A uniaxial loading of the mechanical metamaterial sample is simulated
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Influence of Bimetal Structure and Phase Composition on Localized Plastic Strain Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 D. V. Orlova, G. V. Shlyakhova, L. V. Danilova, M. V. Nadezhkin
The paper investigates the macrolocalization of plastic strain due to uniaxial loading of low carbon/austenitic stainless steel produced by electron-beam additive manufacturing followed by annealing at different temperatures. The stress-strain curve of the bimetallic composite is described by the parabolic law. Due to annealing in the range of 350 to 650°C, the yield strength reduces, while strain-to-failure
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The Effect of Thermal Annealing on Mechanical and Optical Properties of MgAl2O4 Ceramics Fabricated by Spark Plasma Sintering Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 D. E. Deulina, V. D. Paygin, I. N. Shevchenko, S. A. Stepanov, E. S. Dvilis, O. L. Khasanov, D. T. Valiev, F. Huang
The samples of MgAl2O4 ceramics are manufactured by spark plasma sintering at 1300°C and 100 MPa during 20 minutes. Their thermal annealing is conducted in an air atmosphere in a temperature range from 700 to 1300°C for 1 to 30 hours. Their microstructure is analyzed by the X-ray phase analysis and scanning electron microscopy. The influence of thermal treatment parameters on optical and mechanical
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Production of Experimental Samples of Nickel-Based Alloy and Copper Nozzles by Electron Beam Additive Manufacturing Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 Y. V. Kushnarev, V. M. Semenchuk, A. V. Chumaevskii, K. S. Osipovich, V. E. Rubtsov, E. A. Kolubaev
In this work, the characteristics of surface morphology and structure of experimental samples of nickel-based alloy and copper nozzles manufactured by the electron beam additive method have been studied. It is found that the grain boundaries on the outer sample surface are oriented at different angles relative to the substrate due to uneven heat dissipation during printing. It is found that 3D printing
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Effect of Alloying on Dislocation Structure, Cracking and Fracture of Cu–Al and Cu–Mn Alloys in Low-Stability States Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 L. I. Trishkina, A. A. Klopotov, A. I. Potekaev, T. V. Cherkasova, V. I. Borodin, V. V. Kulagina
The influence of alloying on the local structural features of the experimental samples is studied in the regions of their potential cracking in the low-stability states with an aim of revealing the regularities of cracking and fracture. It is found out that the microcrack density in the neighborhood of the fracture region in the Cu+5at.%Al alloy, where cracking is prepared by the fragmented structure
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Investigation of Mode I and II Interlaminar Fracture Toughness of Nylon/Glass Fiber Laminates with Various Layup Orientations Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 M. V. Burkov, A. A. Kononova
An evaluation of the interlaminar fracture toughness of polyamide/glass fiber laminates with various layups is reported. Due to large differences in thermal expansion coefficients of fiber and binder the laminates with layups where single layers are swapped exhibit high warping. A technique for avoiding this is proposed, allowing evaluating interlaminar fracture toughness of various angle interfaces
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The Relationship Between Structural Features and Local Mechanical Properties of a Fine-Grained Matrix in Refractory Ceramic Materials. SiO2 Ceramics Case Study Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 A. A. Lapshina, E. V. Shilko, A. S. Buyakov, A. Y. Smolin, K. Andreev
A numerical investigation of the influence of porosity, pore size, and planar defects (microcracks) on the elastic constants, compressive and tensile strength of a fine-grained matrix in a SiO2 refractory ceramics is presented. The modeling results show a qualitatively different effect of the 3D (pores) and 2D (microcracks) defects on its effective elastic properties. An increase in porosity leads
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Influence of the Parameters of Middle Frequency Magnetron Sputtering on the Elemental Composition, Microstructure, and Mechanical Properties of Ti–Al–Ta–N Coatings Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 A. R. Shugurov, Yu. A. Garanin, E. D. Kuzminov
The influence of the pulse frequency and duty cycle on the elemental composition, microstructure, and mechanical properties of Ti–Al–Ta–N coatings deposited by middle-frequency magnetron sputtering is studied. An increase in the pulse frequency and duty cycle is found to lead to a decrease in the deposition rate and sputtering yield as well as to variations of the coating composition. The coatings
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Studying the Structural Phase Composition and Optical and Mechanical Properties of Al–Si–Re–O Coatings Deposited on Quartz Glass Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-13 R. B. Tursunkhanova, V. P. Sergeev, M. P. Kalashnikov, O. V. Sergeev, A. V. Voronov, V. V. Stuzhuk
The multi-component Al–Si–Re–O coating with a thickness of 3.5 μm was deposited on the quartz glass surface by the method of pulsed magnetron sputtering. Its structural phase state and optical and mechanical properties have been investigated. According to X-ray diffractometry and transmission electron microscopy, the structure of the coating is amorphous and has the following elemental composition:
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Effect of Laser Processing on Impact Resistance of Steel Coating Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-12 S. A. Atroshenko, D. A. Gerashchenkov, M. S. Smakovsky, G. G. Savenkov
The paper investigates the influence of gas dynamic cold spraying followed by laser processing of stainless steel samples on their dynamic (spallation) strength under the impact load at a 105 s–1 strain rate. The impact velocity effect on the microstructure and dynamic strength is studied herein. It is shown that the dynamic strength of steel samples after laser processing remains unchanged compared
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Interaction Between Xenon Particle and Columnar Phase of Nanotorus Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-12 V. I. Borodin, M. A. Bubenchikov, A. M. Bubenchikov, V. A. Ovchinnikov
The paper presents the numerical calculation of the group resistance to the incident particle impact on the supramolecular structure comprising rotating carbon nanotori. Methods of classical molecular mechanics are used to study the interaction between the particle and toroidal cluster in a columnar phase. The analysis is given to the influence of the nanotorus rotation frequency and the supramolecular
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Numerical Simulation of the Effective Piezo-Actuator Properties Based on Solution of Coupled Boundary-Value Electro-Elasticity Problems Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-12 A. N. Anoshkin, A. A. Pankov, P. V. Pisarev, S. R. Bayandin
In this work, a problem is formulated and a mathematical model for numerical calculation of the effective piezoelectro-elastic characteristics of macro fiber composite (MFC) structures is developed. At the macrolevel, constitutive relations are obtained for composite under longitudinal and transverse piezoelectric loading taking into account the conductivity of phases. The electromagnetic coupling
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Identification of Hardening Parameters of Two-Level Statistical Model of Polycrystal Inelastic Deformation Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-12 D. S. Bezverkhy, N. S. Kondratev
The paper is devoted to the problem of identification of hardening parameters of the developed two-level statistical model of polycrystal inelastic deformation taking into account dynamic recrystallization. First, the approximate values of the hardening parameters are obtained, and then they are refined as a result of formulating and solving the optimization problem using the Nelder–Mead method. The
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Determination of a Configuration for Sparse Matrix Phased Array Using Simulated Annealing for Imaging in Ultrasonic NDT Russ. Phys. J. (IF 0.6) Pub Date : 2024-04-12 D. O. Dolmatov
The use of sparse matrix phased arrays can increase the speed of 3D-imaging of the internal structure of objects in ultrasonic nondestructive testing using the Total Focusing Method. The sparse transducer configuration determines the quality of the results. An application of Simulated Annealing for determining the configurations of sparse matrix phased arrays is discussed in terms of the restoration
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Numerical Study of the High-Speed Impact of a Steel Projectile on a Concrete Target Russ. Phys. J. (IF 0.6) Pub Date : 2024-03-26 N. N. Belov, N. T. Yugov, G. P. Tonkikh, A. S. Plyaskin, A. I. Babarykina
The article presents a numerical study of the high-speed impact of a steel projectile on a concrete target. Calculations have been carried out within the framework of a porous elastoplastic medium. The dynamic fracture is considered as the growth and coalescence of microdefects under the action of stresses formed during loading. The projectile interacts with the target at a speed of 600 m/s. As a result
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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