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Model of the Working Process of a Piston Stage with a Flexible Piston 具有柔性活塞的活塞级工作过程模型
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026600456
K. A. Bakulin, S. S. Busarov
{"title":"Model of the Working Process of a Piston Stage with a Flexible Piston","authors":"K. A. Bakulin,&nbsp;S. S. Busarov","doi":"10.1134/S1063785026600456","DOIUrl":"10.1134/S1063785026600456","url":null,"abstract":"<p>A unique design for a reciprocating compressor with a flexible piston is proposed and examined, in which the end surface is made of an elastomeric element and capable of deflecting inward. This design, along with eliminating the linear dead volume, further increases the efficiency by means of the volume created by the deformed elastomeric element. The model for calculating the piston compressor’s working process is refined taking into account an increase in the working chamber volume. With the assumed maximum deflection of the elastomeric element (20% of the piston diameter), the efficiency increases by up to 16% at almost unchanged compressor working temperatures.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 8","pages":"462 - 465"},"PeriodicalIF":0.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859760","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
Electrodynamic Calculation of the Effective Permeability Tensor of 3D Magnetic Nanocomposites by Solving Together with Maxwell’s Equations and the Landau‒Lifshitz Equation 结合Maxwell方程和Landau-Lifshitz方程求解三维磁性纳米复合材料有效磁导率张量的电动力学计算
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026700896
G. S. Makeeva
{"title":"Electrodynamic Calculation of the Effective Permeability Tensor of 3D Magnetic Nanocomposites by Solving Together with Maxwell’s Equations and the Landau‒Lifshitz Equation","authors":"G. S. Makeeva","doi":"10.1134/S1063785026700896","DOIUrl":"10.1134/S1063785026700896","url":null,"abstract":"<p>A technique for the electrodynamic calculation of the effective permeability tensor of 3D magnetic nanocomposites in a model of a nanostructured gyromagnetic medium as a quasi-continuum one has been developed on the basis of solving a quasi-compatible system of equations. Based on the solution of Maxwell’s equations together with the Landau‒Lifshitz equation of motion of the magnetization vector in a ferromagnet, the electrodynamic calculation of components of the effective permeability tensor of a 3D magnetic nanocomposite based on an opal matrix depending on the relative value of the magnetization field has been carried out taking into account the exchange interaction and in the non-exchange approximation.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 8","pages":"442 - 445"},"PeriodicalIF":0.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859761","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
Improve on dV/dt Capability of SCR with Ni Electrode by Cathode Groove Etching 用阴极槽刻蚀法提高镍电极可控硅的dV/dt性能
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026600341
Won Man Kim, Hak Bong Kim, Chong Hyen Ro
{"title":"Improve on dV/dt Capability of SCR with Ni Electrode by Cathode Groove Etching","authors":"Won Man Kim,&nbsp;Hak Bong Kim,&nbsp;Chong Hyen Ro","doi":"10.1134/S1063785026600341","DOIUrl":"10.1134/S1063785026600341","url":null,"abstract":"<p>In this paper, we propose a cathode groove etching structure in which the surface concentration of the <i>p</i><sub>2</sub> region can be increased to the surface concentration of the cathode region in order to enhance the cathode shorts effect of SCR with Ni electrode, and analyze the relationship between the <i>dV</i>/<i>dt</i> capability and cathode groove etching structure parameters of the device. Unlike the Al electrode structure, the limitation of surface concentration of the cathode region in the Ni-electrode SCR is that the surface concentration of the shunt contact cannot be as high as that of the cathode region, and the failure of the shunt contact surface to be an ideal ohmic contact is achieved by cathode groove etching. In a thyristor with Ni electrode, cathode groove etching is used to increase the surface concentration of the <i>p</i><sub>2</sub> region from 10<sup>18</sup> to 10<sup>20</sup> cm<sup>–3</sup>.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 8","pages":"450 - 456"},"PeriodicalIF":0.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859764","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
Using Macrobending for Introduction of Visible and Near-Infrared Light into Optical Fiber 利用大弯曲技术将可见光和近红外光引入光纤
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026600614
A. O. Zenevich, E. V. Novikov, T. A. Matkovskaia, N. M. Kolesnikov, S. Yu. Kazantsev
{"title":"Using Macrobending for Introduction of Visible and Near-Infrared Light into Optical Fiber","authors":"A. O. Zenevich,&nbsp;E. V. Novikov,&nbsp;T. A. Matkovskaia,&nbsp;N. M. Kolesnikov,&nbsp;S. Yu. Kazantsev","doi":"10.1134/S1063785026600614","DOIUrl":"10.1134/S1063785026600614","url":null,"abstract":"<p>The paper investigates the process of introducing visible and near-infrared optical radiation into a multimode optical fiber through a macrobending region. It has been established that the input coefficient depends significantly on the radiation wavelength, the macrobending radius, and the number of fiber turns. It is shown that decreasing the macrobending radius and increasing the number of turns leads to an increase in the efficiency of radiation input, with the greatest losses observed in the shortwave region of the spectrum. The obtained results allow us to gain a deeper understanding of the mechanism of radiation input through macrobending and can be used in the development of fiber-optic light sensors and other optical devices.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"429 - 433"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856652","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
Changes in the Performance Properties of Motor Oils during Thermal Oxidation in the Oil System of an Aviation Rotary Piston Engine 航空旋转活塞发动机油系热氧化过程中机油性能的变化
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026700847
A. L. Kozlov
{"title":"Changes in the Performance Properties of Motor Oils during Thermal Oxidation in the Oil System of an Aviation Rotary Piston Engine","authors":"A. L. Kozlov","doi":"10.1134/S1063785026700847","DOIUrl":"10.1134/S1063785026700847","url":null,"abstract":"<p>The article presents the results of a study of changes in the operational properties of AERO 2T and M-5z/20 AERO engine oils under thermal oxidation conditions at temperatures of 150–200°C, simulating the operation of an aircraft rotary piston engine. The effect of topping up fresh oil (up to 20%), Avgas 100 LL aviation gasoline additives (up to 10%), and water (distilled and seawater, up to 1%) has been experimentally studied. Based on the data obtained, empirical dependences are proposed for calculating changes in the physicochemical and operational properties of oils over time. The discrepancy between the calculated and experimental values does not exceed ±5%.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"407 - 412"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856667","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
Numerical Simulation of a Single Boundary-Layer Problem Based on a Higher-Order Difference Scheme 基于高阶差分格式的单边界层问题数值模拟
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026700872
I. V. Anisimova, S. V. Nikiforova
{"title":"Numerical Simulation of a Single Boundary-Layer Problem Based on a Higher-Order Difference Scheme","authors":"I. V. Anisimova,&nbsp;S. V. Nikiforova","doi":"10.1134/S1063785026700872","DOIUrl":"10.1134/S1063785026700872","url":null,"abstract":"<p>A mathematical model of the problem of a cylindrical body flow by a supersonic gas flow in the boundary-layer area is considered. Classical difference schemes do not accurately describe the boundary differential problem due to the fact that its solutions allow for areas of large gradients. In this regard, a higher-order difference scheme was constructed and justified on a three-point pattern, which provides an adequate account of the approximation viscosity commensurable with the value of the grid step. A numerical experiment was performed, which allowed the effectiveness of the higher-order scheme to be evaluated.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"393 - 399"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148854726","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
About Features of Collisions of Small-Sized Models with Single Large Drops 关于具有单个大液滴的小型模型碰撞的特征
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026700859
A. Y. Varaksin, M. E. Romash
{"title":"About Features of Collisions of Small-Sized Models with Single Large Drops","authors":"A. Y. Varaksin,&nbsp;M. E. Romash","doi":"10.1134/S1063785026700859","DOIUrl":"10.1134/S1063785026700859","url":null,"abstract":"<p>In the paper, the results of a study of collisions between small-sized models and large single droplets have been presented. Methodological experiments have demonstrated the viability of a ballistic stand and developed methods for synchronizing the model’s flight through the measurement section and its photographic recording. Initial data on the characteristics of asymmetric and quasi-symmetric interactions between the model and a single large droplet have been obtained. Several objectives for further research have been formulated.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"425 - 428"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856668","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
Application of Digital Technologies in Diagnostics of Engines of High-Energy Agricultural Machinery 数字技术在高能农机发动机诊断中的应用
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026700884
Yu. V. Kataev, I. A. Tishaninov, E. F. Malykha, N. V. Sergeeva
{"title":"Application of Digital Technologies in Diagnostics of Engines of High-Energy Agricultural Machinery","authors":"Yu. V. Kataev,&nbsp;I. A. Tishaninov,&nbsp;E. F. Malykha,&nbsp;N. V. Sergeeva","doi":"10.1134/S1063785026700884","DOIUrl":"10.1134/S1063785026700884","url":null,"abstract":"<p>The development of digital technologies that improve diagnostics and increase the reliability of determining the functional characteristics of agricultural machinery in real time is important and relevant for the technical support of high-power machines. To develop an intelligent system for remote diagnostics of engines of high-power agricultural machinery, a neural network constructor with the ability to use up to ten input and output parameters has been used. An algorithm for a digital remote diagnostics system, a failure prediction model for online monitoring, and a digital platform for diagnosing high-power agricultural machinery have been developed. The developed platform has enabled the acquisition of diagnostic parameters of the internal combustion engine (fuel consumption, engine temperature, and engine speed). These parameters are remotely transmitted as encrypted data to a server via a GPS modem and digitized in a database, where the data is structured and analyzed using a developed artificial neural network model. The decrypted engine diagnostic parameters are sent to the operator, who views graphs of agricultural machinery technical condition parameters and reports on predicting possible internal combustion engine component failures. A method for collecting and storing diagnostic information obtained from monitoring the technical condition of agricultural machinery has been presented, and these data have been processed using a mathematical neural network model. The use of digital technologies in diagnosing equipment using artificial intelligence makes it possible to reduce significantly the labor intensity of operations, evaluate overall machine performance, predict failures, conduct timely maintenance and repairs, and reduce unplanned downtime of energy-intensive agricultural machinery.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"400 - 406"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856666","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
Monitoring the Radiative Properties of Ozone under Thermal Nonequilibrium Conditions in Aviation Systems 航空系统热非平衡条件下臭氧辐射特性的监测
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026600638
A. M. Molchanov, A. S. Tushkanov
{"title":"Monitoring the Radiative Properties of Ozone under Thermal Nonequilibrium Conditions in Aviation Systems","authors":"A. M. Molchanov,&nbsp;A. S. Tushkanov","doi":"10.1134/S1063785026600638","DOIUrl":"10.1134/S1063785026600638","url":null,"abstract":"<p>A method for calculating the radiation characteristics of ozone under conditions of vibrational–rotational nonequilibrium is proposed for use in remote monitoring of the Earth’s atmosphere using aviation systems. The method is based on the use of the classical narrow-band k-distribution model, which includes corrections for disequilibrium. These corrections include vibrational and rotational distribution functions, as well as averaged Boltzmann functions over vibrational and rotational temperatures. To check the method, a series of nonequilibrium calculations were carried out, which were compared with the exact line-by-line method in the spectral range of 500 to 1150 cm<sup>–1</sup>. The comparison, which was carried out over a wide range of pressures, translational, rotational, and vibrational temperatures, showed good agreement.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"413 - 418"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148854723","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
Analysis of Quality and Electricity Loss in 0.4 kV Networks using Measurement Systems 用测量系统分析0.4 kV电网的质量和损耗
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-29 DOI: 10.1134/S1063785026700835
Ahmad Alzakkar, V. V. Romanova, N. P. Mestnikov, Y. O. Samofalov
{"title":"Analysis of Quality and Electricity Loss in 0.4 kV Networks using Measurement Systems","authors":"Ahmad Alzakkar,&nbsp;V. V. Romanova,&nbsp;N. P. Mestnikov,&nbsp;Y. O. Samofalov","doi":"10.1134/S1063785026700835","DOIUrl":"10.1134/S1063785026700835","url":null,"abstract":"<p>The relevance of the study is determined by the fact that in the presence of single and three phase loads, the network mode is almost always asymmetric, which causes additional losses of electricity. The aim of the study is to evaluate methods and develop algorithms for calculating electricity losses from consumers in 0.4 kV networks with single and three phase loads using measurement systems. The tasks of study are analyzing of the graph resulting from daily monitoring of loads by a device for measuring power quality indicators (RESURS UF); determining the coefficient of additional losses that arise when the loads are unbalanced; defining an algorithm of procedures and calculations to reduce electricity losses resulting from unbalanced loads and determining the losses for a 0.4 kV overhead line of standard length 600 m and 15 towers using method of loop currents. The results of the study are the need to monitor loads using smart meters to calculate electricity losses and determine the optimal load balance; an algorithm was developed to reduce electricity losses by balancing loads, which can be generalized to all power supply organizations and analysis of methods for calculating modes of four lines network with a load distributed along the line showed the rationality of using the method of loop currents.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 7","pages":"419 - 424"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148854725","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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