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Numerical Investigation of Aeration Condition Formation in Different Morphotypes of Urban Development 不同城市发展形态下通气条件形成的数值研究
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-20 DOI: 10.1134/S1063784225700562
V. D. Meshkova, P. D. Shul’zhenko, K. Yu. Litvintsev, A. A. Dekterev, D. A. Dekterev
{"title":"Numerical Investigation of Aeration Condition Formation in Different Morphotypes of Urban Development","authors":"V. D. Meshkova,&nbsp;P. D. Shul’zhenko,&nbsp;K. Yu. Litvintsev,&nbsp;A. A. Dekterev,&nbsp;D. A. Dekterev","doi":"10.1134/S1063784225700562","DOIUrl":"10.1134/S1063784225700562","url":null,"abstract":"<p>The morphological description of housing development is presented that is based on its basic characteristics: the geometrical profile of buildings, height of buildings, and mutual arrangement of buildings. In analysis, the characteristic morphotypes of urban housing have been selected for which the formation of aeration conditions has been investigated. The homogeneous and nixed morphotypes of perimeter housing development, as well as the homogeneous morphotypes of spot and ribbon developments, have been considered. Investigations have been carried out by numerical simulation. Computation has been fulfilled in the SigmaEco program suite using a microscale model of the urban atmosphere. Simulation data are presented in the form of horizonal velocity fields at a height of 2 m. For each morphotype, velocity distributions along street canyons are shown. It has been found that the geometrical profile of buildings and their mutual arrangement influence the formation of aeration conditions. It has turned out that regions with the homogeneous and mixed morphotypes of perimeter housing development and the homogeneous morphotype of row development provide the most favorable aeration conditions.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"70 :","pages":"646 - 652"},"PeriodicalIF":0.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340607","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}
引用次数: 0
An Experimental Study of Emulsion Generation Using a Microfluidic Droplet Generator 微流控液滴生成乳化液的实验研究
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-20 DOI: 10.1134/S1063784225700495
A. A. Shebeleva, A. S. Yakimov, A. V. Minakov, A. I. Pryazhnikov
{"title":"An Experimental Study of Emulsion Generation Using a Microfluidic Droplet Generator","authors":"A. A. Shebeleva,&nbsp;A. S. Yakimov,&nbsp;A. V. Minakov,&nbsp;A. I. Pryazhnikov","doi":"10.1134/S1063784225700495","DOIUrl":"10.1134/S1063784225700495","url":null,"abstract":"<p>The paper presents the results of an experimental study aimed at perfection of methods for producing emulsions, conducted using a microfluidic droplet generator made of epoxy resin with the lab-on-a-chip technology. The proposed device fabrication approach, described in the paper in detail, guarantees increased accuracy and reproducibility of the results. The method presented is optimally suited for complex chemical experiments, ensuring high operational stability over long time. During the experiments, the ranges of stable emulsion existence were determined depending on the carrier and dispersed phase pressures, as well as the oil droplet sizes in the emulsion.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"70 :","pages":"585 - 590"},"PeriodicalIF":0.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340582","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}
引用次数: 0
Development of a Method for Fabrication of Microfluidic Rheometers from Epoxy Resin 环氧树脂制备微流控流变仪方法的研究
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-20 DOI: 10.1134/S1063784225700574
A. S. Yakimov, A. I. Pryazhnikov, V. D. Meshkova, V. A. Prigozhikh
{"title":"Development of a Method for Fabrication of Microfluidic Rheometers from Epoxy Resin","authors":"A. S. Yakimov,&nbsp;A. I. Pryazhnikov,&nbsp;V. D. Meshkova,&nbsp;V. A. Prigozhikh","doi":"10.1134/S1063784225700574","DOIUrl":"10.1134/S1063784225700574","url":null,"abstract":"<p>The work is devoted to the development and fabrication of durable, transparent, and accessible microfluidic chips made of epoxy resin for studying the rheological and physicochemical properties of oilfield fluids. The chips were fabricated using a casting method (pour-into-mold) from an epoxy compound (KER-215 resin and Sintamin hardener) using polydimethylsiloxane (PDMS) master molds. This work resulted in prototypes of microfluidic viscometers and rheometers designed to measure the viscoplastic and viscoelastic properties of fluids. Chips with various topologies were fabricated, including a hyperbolic constriction, a fan-shaped channel, and curved channels for studying secondary flows (Dean vortices). The resulting topologies enable not only standard measurements of the pressure drop versus flow rate, but also the determination of rheological properties based on the shape of streamlines and the behavior of vortex structures. The functionality of the chips was confirmed by experiments with non-Newtonian fluids, yielding pressure drop versus flow rate dependences suitable for determining viscosity and other rheological parameters. The developed epoxy microfluidic chips offer a promising and cost-effective platform for rapid analysis of the rheological properties of oilfield fluids, which is particularly relevant for selecting the optimal composition of displacement fluids in oil production.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"70 :","pages":"591 - 601"},"PeriodicalIF":0.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340187","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}
引用次数: 0
Mechanism of Destruction of Friction Surfaces of Ceramic Materials Based on Zirconium Dioxide under Dry Friction 基于二氧化锆的陶瓷材料摩擦面干摩擦破坏机理研究
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-18 DOI: 10.1134/S1063784225601231
V. V. Alisin, I. N. Kravchenko, M. N. Erofeev, I. A. Leshakov, O. S. Bukov
{"title":"Mechanism of Destruction of Friction Surfaces of Ceramic Materials Based on Zirconium Dioxide under Dry Friction","authors":"V. V. Alisin,&nbsp;I. N. Kravchenko,&nbsp;M. N. Erofeev,&nbsp;I. A. Leshakov,&nbsp;O. S. Bukov","doi":"10.1134/S1063784225601231","DOIUrl":"10.1134/S1063784225601231","url":null,"abstract":"<p>The issues of formation of the third body during dry friction on steel of nanostructured zirconium dioxide crystals partially stabilized by yttrium oxide are considered. The assumption is substantiated that the tribological properties of the friction pair under study are determined by the properties of the films formed on the surface of the crystals. The results of electron microscopic studies of crystal friction surfaces are presented. The elemental composition has been determined, and the phase composition of the transfer films of various areas of the friction surface of crystals have been calculated. It has been established that at high magnifications, the structure of the films on the friction surface of samples with 2–4 mol% Y<sub>2</sub>O<sub>3</sub> is quite uniform with traces of the boundaries of smaller particles of the transferred material. The destruction of the friction surface of the sample with a Y<sub>2</sub>O<sub>3</sub> content of 8 mol% occurs at a deeper level and affects not only the layer of secondary structures, but also the underlying layers of the base material. Recommendations for the selection of friction pairs for high-temperature friction units are formulated.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"1 - 7"},"PeriodicalIF":0.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388532","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}
引用次数: 0
Plasma Modification of Peat Fuel Granules 泥炭燃料颗粒的等离子体改性
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-18 DOI: 10.1134/S1063784225601383
M. B. Shavelkina, S. D. Fedorovich, Yu. M. Faleeva, M. A. Shavelkin, D. I. Kavyrshin, G. E. Valyano
{"title":"Plasma Modification of Peat Fuel Granules","authors":"M. B. Shavelkina,&nbsp;S. D. Fedorovich,&nbsp;Yu. M. Faleeva,&nbsp;M. A. Shavelkin,&nbsp;D. I. Kavyrshin,&nbsp;G. E. Valyano","doi":"10.1134/S1063784225601383","DOIUrl":"10.1134/S1063784225601383","url":null,"abstract":"<p>Granulated high-moor peat is used in power engineering as a fuel for production of electric power or heat for industrial, living, and other purposes; however, its combustion is accompanied with distinctive odor, and long storage is complicated by its high wetting ability. To improve the consumption characteristics of granulated peat, the granule surface has been modified using the atmospheric-pressure induction plasma. The component composition of the plasma flow for granule processing has been determined from analysis of radiation spectra of the argon plasma. In the plasma flow, the presence of OH radical has been detected, which destroy the organic part of peat, including bitumen, water-soluble substances, cellulose, humic acid, and lignin. It has been established from the investigation of thermal decomposition of modified fuel granules that after the action of the plasma, upon heating, the intensity of formation of gaseous products decreases due to the removal of high-volatile components. The morphology of the processed granule surface has been investigated using electron microscopy. On the surface of the fibers forming the peat structure, thin channels have been detected, which change the floatation properties of granules. After plasma processing, granulated high-moor peat can be used for sorption of oil products before their combustion in boilers, which reduces the expenditures for recycling the sorbent and diminishes the discharge to the environment.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"17 - 24"},"PeriodicalIF":0.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388530","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}
引用次数: 0
Effect of Atmospheric Refraction on a Satellite Optical Communication Channel 大气折射对卫星光通信信道的影响
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-18 DOI: 10.1134/S1063784225601309
M. V. Sapozhnikov, S. Yu. Kazantsev, Yu. B. Mironov, O. V. Kochergina
{"title":"Effect of Atmospheric Refraction on a Satellite Optical Communication Channel","authors":"M. V. Sapozhnikov,&nbsp;S. Yu. Kazantsev,&nbsp;Yu. B. Mironov,&nbsp;O. V. Kochergina","doi":"10.1134/S1063784225601309","DOIUrl":"10.1134/S1063784225601309","url":null,"abstract":"<p>In this study, the effect of atmospheric refraction on parameters of optical radiation propagating through the atmosphere is investigated with account for the optical beam shift at the receiver aperture and a change in the physical length of the beam trajectory in the atmosphere. We report on the results of numerical modeling based on approximations in different models of the Earth atmosphere, which has made it possible to assess quantitatively the optical beam shift in the receiver plane. Analysis has been performed for different wavelengths, input angles of the beam to the atmosphere, latitudes and seasons with account for homogeneity of atmospheric layers in various limits. The importance of taking into account the actual satellite trajectory and atmospheric pressure and temperature profiles as functions of altitude in designing satellite optical communication systems has been demonstrated. Resulting data can be useful for optimization of designing and for the improvement of reliability of optical communication systems in the conditions of variability of real atmosphere.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"8 - 16"},"PeriodicalIF":0.7,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388533","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}
引用次数: 0
Erratum to: Study of the Influence of the Energy of Argon Ions on the Surface Roughness of the Main Sections of Single-Crystal Silicon 氩离子能量对单晶硅主要部分表面粗糙度影响的研究
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-09 DOI: 10.1134/S1063784226010019
M. S. Mikhailenko, A. E. Pestov, A. K. Chernyshev, M. V. Zorina, N. I. Chkhalo, N. N. Salaschenko
{"title":"Erratum to: Study of the Influence of the Energy of Argon Ions on the Surface Roughness of the Main Sections of Single-Crystal Silicon","authors":"M. S. Mikhailenko,&nbsp;A. E. Pestov,&nbsp;A. K. Chernyshev,&nbsp;M. V. Zorina,&nbsp;N. I. Chkhalo,&nbsp;N. N. Salaschenko","doi":"10.1134/S1063784226010019","DOIUrl":"10.1134/S1063784226010019","url":null,"abstract":"","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"45 - 45"},"PeriodicalIF":0.7,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388536","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}
引用次数: 0
Erratum to: Investigation of the Angular Dependences of the Velocities of Ion-Beam Sputtering of Metals for the Synthesis of Mask Blanks 金属离子溅射速度的角依赖性研究用于掩模毛坯的合成
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-09 DOI: 10.1134/S1063784226010020
M. S. Mikhailenko, A. E. Pestov, A. K. Chernyshev, N. I. Chkhalo
{"title":"Erratum to: Investigation of the Angular Dependences of the Velocities of Ion-Beam Sputtering of Metals for the Synthesis of Mask Blanks","authors":"M. S. Mikhailenko,&nbsp;A. E. Pestov,&nbsp;A. K. Chernyshev,&nbsp;N. I. Chkhalo","doi":"10.1134/S1063784226010020","DOIUrl":"10.1134/S1063784226010020","url":null,"abstract":"","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"46 - 46"},"PeriodicalIF":0.7,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388535","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}
引用次数: 0
Influence of Cladding with Flux-Cored Wire on the Structural–Phase State of Steel 20 药芯焊丝包覆对钢组织相状态的影响
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-03 DOI: 10.1134/S1063784225700410
A. N. Smirnov, N. A. Popova, N. V. Ababkov, E. L. Nikonenko, V. L. Knyazkov, E. E. Levashova
{"title":"Influence of Cladding with Flux-Cored Wire on the Structural–Phase State of Steel 20","authors":"A. N. Smirnov,&nbsp;N. A. Popova,&nbsp;N. V. Ababkov,&nbsp;E. L. Nikonenko,&nbsp;V. L. Knyazkov,&nbsp;E. E. Levashova","doi":"10.1134/S1063784225700410","DOIUrl":"10.1134/S1063784225700410","url":null,"abstract":"<p>Using transmission diffraction electron microscopy methods on thin foils, the influence of the metal of surfacing with welding wire of type 0.35С–5Cr–1Mn–1V–1Ni–1W–1Mo–Fe on the structure of the substrate made of steel 20 has been investigated. A quantitative analysis of changes in the fine structure of the substrate and surfacing materials at different distances (0.5 and 3.0 mm) from the fusion line has been performed. The morphological components of the structure, their volume fraction and phase composition have been determined. It has been established that in the initial state, steel 20 is represented by lamellar pearlite and ferrite. Surfacing with welding wire has led to significant destruction of lamellar pearlite, complete fragmentation of ferrite, release of small cementite particles at the boundaries and joints of ferrite fragments, creation of an elastically stressed state of the steel matrix, and strengthening of the substrate by 1.5 times.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"70 11","pages":"544 - 551"},"PeriodicalIF":0.7,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336763","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}
引用次数: 0
Automatic Compensation of Thermo-Deformation Interferences in Information and Measurement Systems of Spacecraft 航天器信息测量系统热变形干扰的自动补偿
IF 0.7 4区 物理与天体物理
Technical Physics Pub Date : 2026-02-03 DOI: 10.1134/S1063784225700422
M. Yu. Livshits, B. B. Borodulin
{"title":"Automatic Compensation of Thermo-Deformation Interferences in Information and Measurement Systems of Spacecraft","authors":"M. Yu. Livshits,&nbsp;B. B. Borodulin","doi":"10.1134/S1063784225700422","DOIUrl":"10.1134/S1063784225700422","url":null,"abstract":"<p>The efficiency of the operation of information-measuring systems of spacecraft (and, primarily, optical systems) depends on the thermal deformations of the load-bearing structure, on which they are placed. Small angular thermo-deformation displacements of the optical axes, which are caused by the nonuniformity of the temperature field of the load-bearing structure, lead to significant linear deviations of the measurement points due to the large distance of the measurement objects from the spacecraft’s orbit. The article discusses the dynamic characteristics of the automatic temperature field stabilization systems of the load-bearing structure of a small spacecraft under the influence of external and internal disturbances typical of this type of objects.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"70 11","pages":"496 - 504"},"PeriodicalIF":0.7,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336348","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}
引用次数: 0
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