Technical Physics最新文献

{"title":"Modification of Polymeric and Composite Materials in Supercritical Fluids","authors":"A. D. Sabirova,&nbsp;R. R. Antipov,&nbsp;T. R. Bilalov","doi":"10.1134/S1063784224700956","DOIUrl":"10.1134/S1063784224700956","url":null,"abstract":"<p>The article presents a brief review of the most important properties of supercritical fluids, in particular, supercritical carbon dioxide. The methods of modification of polymeric and composite materials are considered. Analysis of literature on the methods for materials modification using supercritical fluid media shows their high efficiency of obtaining complex polymer compositions and their processing in order to impart additional properties to them.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 10","pages":"2571 - 2573"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Efficiency of a Two-Stage Isobutane Heat Pump","authors":"M. S. Purdin,&nbsp;V. V. Yuzyuk","doi":"10.1134/S1063784224700786","DOIUrl":"10.1134/S1063784224700786","url":null,"abstract":"<p>The paper substantiates the relevance of studying the methods for improving the efficiency of heat pumps. Two schemes of two-stage heat pumps and models for them are developed, which permitted calculating the thermal characteristics of cycles. The schemes differ by the presence of a supercooler for condensate. Conclusions are made about the advantages of isobutane as a working fluid over other substances. Maps of modes for the calculated coefficient of thermal transformation are constructed. It is shown that two-stage pumps have a higher coefficient of transformation than single-stage ones. The presence of supercoolers increases the transformation coefficient for both single-stage and two-stage heat pumps. It is found that the coefficient of thermal transformation of the second stage increases with an increase in the temperature difference between the freon temperature at the inlet to the second-stage compressor and the condenser temperature of the second stage.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2472 - 2481"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Algorithm of the Search for Inhomogeneities in the Inverse Nonlinear Diffraction Problems","authors":"A. O. Lapich,&nbsp;M. Yu. Medvedik","doi":"10.1134/S1063784224700749","DOIUrl":"10.1134/S1063784224700749","url":null,"abstract":"<p>This study is aimed at the solution of the inverse problem used for determining the inhomogeneity of an object. The scattered field is measured beyond its limits with a certain set of observation points. It is assumed that the radiation source and the observation points are located outside the object under investigation. The scattered field is modeled as the result of solution of the direct problem. For solving the inverse problem, a two-step method is employed. The application of various types of nonlinearities is considered. The computational grid is introduced using the generalized grid method. A numerical method for solving this problem is proposed and implemented. The numerical results reported here demonstrate the solution to the problem for preset experimental data.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 9","pages":"2454 - 2460"},"PeriodicalIF":1.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculations on the Interaction of Intense Radiation with Matter in a Magnetic Field","authors":"V. V. Kuzenov,&nbsp;A. A. Normurodov","doi":"10.1134/S1063784224700725","DOIUrl":"10.1134/S1063784224700725","url":null,"abstract":"<p>In the presented article, a qualitative analysis of the plasmadynamic modes of operation of a magnetoplasma compressor (MPC) (specifically, an end-type MPC discharge) is performed. It is shown that the most acceptable mode for optical pumping of gas lasers in the ultraviolet (UV) range of the spectrum is the mode of inhibition of the plasma of the MPC discharge on a gas barrier (ohmic mode). Spatial distributions of plasma parameters are obtained.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2379 - 2385"},"PeriodicalIF":1.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the Controllability of Performances of Plasmon Graphene Nanoantenna Arrays in the Mid-IR Range","authors":"G. S. Makeeva","doi":"10.1134/S1063784224700737","DOIUrl":"10.1134/S1063784224700737","url":null,"abstract":"<p>The implementation of nanoantennas for optical wireless communications in the infrared (IR) and visible ranges ensures higher data transfer rates, reducing simultaneously the antenna size. The possibility to tune the performances of graphene by chemical doping or bias voltage is relevant in the development of reconfigurable nanoantennas. The goal of this research is the study of the performances (S‑parameters and radiation patterns (RPs)) of plasmonic graphene nanoantenna (PGNA) arrays, their controllability, and the possibility of frequency scanning by changing the chemical potential of graphene (by applying an external electric field) in the mid-IR range. The use of graphene, which has a controlled high electrical conductivity, and plasmonic properties in the terahertz (THz), far-IR and mid-IR ranges is one of the most promising alternatives to noble metals (Au and Ag) as plasmonic materials at optical frequencies only. Modeling the performances of PGNA arrays was carried out using the electrodynamic modeling program CST Microwave Studio 2023, which makes it possible to solve scientific problems associated with the design of graphene antennas in the IR wavelength range. The results of modeling the controllability of the characteristics (S‑parameters, RPs) of a single element of the antenna array (PGNA of rectangular geometry) and PGNA arrays at the resonant frequencies of the fundamental mode of surface plasmon polaritons (SPPs) are obtained, and the possibility of scanning in frequency upon a change in the chemical potential of graphene (by applying an external electric fields) in the mid-IR range is demonstrated. The results of modeling the performances of PGNA arrays show that with an increase in the chemical potential of graphene (in the interval of values of 0.3–1 eV), the operating frequencies are adjusted (frequency scanning) in the mid-IR range, the gain of the PGNA array increases, the RP main lobe narrows, and the RP side lobe level decreases with an increase in the number of single elements (<i>N</i> = 256); and better controllability of the RP main lobe is observed.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2386 - 2396"},"PeriodicalIF":1.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiation–Magnetogasdynamic Calculations in the Interaction of Powerful Energy Flows with Matter in a Magnetic Field","authors":"V. V. Kuzenov,&nbsp;S. V. Ryzhkov","doi":"10.1134/S1063784224700713","DOIUrl":"10.1134/S1063784224700713","url":null,"abstract":"<p>This study is aimed at the theoretical investigation of interaction of powerful energy beams with a plasma in a magnetic field, as well as at the elucidation of thermal-physics and fluid-dynamics problems in such calculations. We consider different regimes of a linearly stabilized surface discharge and estimate radiation–plasmadynamic regimes and structures in powerful emitting jets of a surface discharge. Time dependences of the main characteristics are plotted for different voltages and discharge channel lengths for argon and air.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2372 - 2378"},"PeriodicalIF":1.1,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnostics of Development of Resonance Effects Based on the Application of the Acoustic Resonance Method","authors":"O. V. Mitrofanova,&nbsp;I. G. Pozdeeva,&nbsp;N. A. Starovoitov","doi":"10.1134/S1063784224700695","DOIUrl":"10.1134/S1063784224700695","url":null,"abstract":"<p>Our experimental and theoretical investigations are aimed at determining conditions for the excitation of resonance effects in complex hydromechanical systems and the development of a diagnostic method for preventing hazardous vibronoise regimes in them. In analysis of the acoustic vibration spectrum obtained in the experiments based on acoustic resonance method, three vibronoise regimes have been singled out: the subsonic regime, the beat regime, and the resonant regime. In the beat and resonant regimes, pronounced acoustic vibrations have been detected (moderate-intensity vibrations in the beat regime and high-intensity vibrations in the resonant regime). The resonant regime of operation is distinguished by the highest acoustic vibration amplitude and can pose a threat for reliable and safe operation of power stations. It is shown that the vortex flow structuring effect can be diagnosed from the characteristic amplitude peaks in the acoustic spectrum even in the subsonic regime.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2358 - 2363"},"PeriodicalIF":1.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Current Research to Substantiate Ways to Improve the Efficiency of Power Installations","authors":"O. V. Mitrofanova","doi":"10.1134/S1063784224700701","DOIUrl":"10.1134/S1063784224700701","url":null,"abstract":"<p>The conducted research is designed to develop scientifically sound recommendations in order to optimize design and layout solutions that ensure increased energy efficiency and operability of energy-producing installations for various purposes. The mechanisms leading to the formation of stable vortex structures in internal turbulent swirl flows occurring in complex channels of power plants are considered. The effects associated with the manifestation of the swirl flow crisis are considered. It is shown that the generation of stable vortex formations in the equipment elements of power installations can be directly related to the mechanism of excitation of dangerous vibro-resonance effects. A method for intensifying heat transfer in steam generating channels is proposed. The question of choosing the criterion of thermohydraulic efficiency for solving optimization problems is considered.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2364 - 2371"},"PeriodicalIF":1.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Drag Force of a Hot Ball","authors":"S. O. Gladkov","doi":"10.1134/S106378422470066X","DOIUrl":"10.1134/S106378422470066X","url":null,"abstract":"<p>The paper provides a detailed solution to the problem of calculating the drag force of a hot ball moving in a viscous continuum. The problem is solved in the stationary case on time intervals when the heat exchange of the body with the environment does not lead to significant changes in its temperature. The limiting case is considered, when the Nusselt number is large (the thermal conductivity is small) and the temperature of the heated ball is considered constant together with the ambient temperature.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2339 - 2343"},"PeriodicalIF":1.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Generalization of the Stokes Formula","authors":"S. O. Gladkov","doi":"10.1134/S1063784224700683","DOIUrl":"10.1134/S1063784224700683","url":null,"abstract":"<p>In this study, the Stokes formula permitting the calculation of the drag force for any spherical (including inhomogeneous) bodies is generalized. It is shown that in all physically interesting cases with different boundary conditions in the limiting transition to a homogeneous solid ball, the result is always the classical Stokes formula <span>(F = 6pi eta Ru)</span>.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 8","pages":"2354 - 2357"},"PeriodicalIF":1.1,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}