Technical Physics Letters最新文献

{"title":"Laminar Chaos in Coupled Time-Delay Systems","authors":"D. D. Kulminskiy, V. I. Ponomarenko, M. D. Prokhorov","doi":"10.1134/s1063785023170157","DOIUrl":"https://doi.org/10.1134/s1063785023170157","url":null,"abstract":"<p><b>Abstract</b>—The possibility of the existence of laminar chaos in coupled time-delayed feedback systems is investigated. The cases of unidirectional and mutual coupling of time-delay systems are considered. It is shown for the first time that laminar chaos can exist not only in a system with a variable delay time, but also in a system with a constant delay time, if it is coupled with a system in the regime of laminar chaos.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"56 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179541","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":"Peculiarities of Nucleation and Growth of InGaN Nanowires on SiC/Si Substrates by HVPE","authors":"S. A. Kukushkin, A. V. Osipov, A. V. Redkov, V. M. Stozharov, E. V. Ubiyvovk, Sh. Sh. Sharofidinov","doi":"10.1134/s1063785023170145","DOIUrl":"https://doi.org/10.1134/s1063785023170145","url":null,"abstract":"<p><b>Abstract</b>—The growth of InGaN layers on hybrid SiC/Si substrates with orientations (100), (110), and (111) by the HVPE method was studied at temperatures that wittingly exceed the temperature of InN decomposition onto nitrogen atoms and metallic In (1000°C). On substrates with orientations (110) and (111), the formation of InGaN whisker nanocrystals was observed. The shape and growth mechanisms of nanocrystals were investigated. It is shown that nanocrystals nucleate on the (111) surface only inside <i>V</i>-defects formed at the points where screw dislocations exit onto the surface. On the (110) surface, nanocrystals are formed only on pedestals that arise during the film growth. An explanation is given for the difference in the growth mechanisms of nanocrystals on substrates of different orientations.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"14 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179567","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 Question of an Analytical Estimate of Some Internal Sizes of the Earth","authors":"S. O. Gladkov","doi":"10.1134/S1063785024700482","DOIUrl":"10.1134/S1063785024700482","url":null,"abstract":"<p>Using a model representation of the motion of the Earth’s core in a viscous continuum, its equation of motion has been obtained and the linear size of the barysphere has been analytically found. A completely adequate estimate of the distance from the Earth’s center to the center of mass of the core has been given, which does not contradict modern geodetic concepts. It has been shown that the proposed model, which is not related to measuring the velocities of longitudinal and transverse seismic waves, makes it possible to determine quite satisfactorily all the basic geometric parameters of the barysphere.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"353 - 359"},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179533","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":"Microwave Tomography Method for Solving the Inverse Problem on Cylindrical Bodies","authors":"A. O. Lapich,&nbsp;M. Y. Medvedik","doi":"10.1134/S1063785024700469","DOIUrl":"10.1134/S1063785024700469","url":null,"abstract":"<p>The principal aim of this study is to find a solution to the inverse problem of diffraction on cylindrical bodies located in free space. This problem can be applied in the diagnosis of breast cancer.<i>.</i> It is proposed to reduce the initial boundary value problem for the Helmholtz equation to an integral equation. This equation will be solved numerically. A two-step algorithm is used to solve the inverse problem. Graphic images are presented to illustrate the permittivity inside a body for the initial problem and for reconstructed values. A numerical method for finding the wave function is proposed and implemented, which makes it possible to identify the structure of an object without damaging or destroying it.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"360 - 364"},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179532","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 Question of the Analytical Calculation of the Dry Fiction Coefficient","authors":"S. O. Gladkov","doi":"10.1134/S1063785024700470","DOIUrl":"10.1134/S1063785024700470","url":null,"abstract":"<p>Based on the principles of correlation theory, the dependence is calculated of dry friction sliding factor <span>(k)</span> in the form of a function from Poisson coefficients of both bodies <span>(sigma )</span> and <span>(sigma ')</span> and temperature <span>(T)</span>. The research method is based on the application of Green’s temperature functions for unbalanced processes. The dependence of the dry friction factor on the Poisson coefficients of both bodies and temperature has been found. A mathematical description is given of the dry friction factor depending on the parameters, meaning the function <span>(k = kleft( {sigma ,sigma ',T} right))</span>, which this is extremely important for the practical application of the resulting dependency.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"347 - 352"},"PeriodicalIF":0.8,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142179531","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":"A New Approach to the Brachistochrone Problem with Allowance for Dry Friction","authors":"S. O. Gladkov","doi":"10.1134/S1063785024700457","DOIUrl":"10.1134/S1063785024700457","url":null,"abstract":"<p>Using a new variational approach to the brachistochrone problem with allowance for dry friction, an analytically justified system of differential equations that yields the exact solution to the problem has been obtained. The dependence of the velocity on the friction coefficient has been calculated, and the parametric trajectory equation is reported.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"341 - 346"},"PeriodicalIF":0.8,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866314","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":"Erratum to: Structure and Properties of Multicomponent Diffusion Boride Coatings Formed on a Hardened 30KhGSA Steel Surface","authors":"S. G. Ivanov,&nbsp;A. M. Guryev,&nbsp;M. A. Guryev,&nbsp;I. V. Sentyabov,&nbsp;E. V. Chernykh","doi":"10.1134/S1063785024340029","DOIUrl":"10.1134/S1063785024340029","url":null,"abstract":"","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"84 - 84"},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415151","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":"Erratum to: The Effect of Heat Treatment on the Structure and Properties of VCh 35 Ductile Cast Iron","authors":"S. G. Ivanov,&nbsp;A. M. Guryev,&nbsp;M. A. Guryev,&nbsp;N. V. Mal’kov,&nbsp;D. A. Astakhov,&nbsp;V. V. Romanenko,&nbsp;E. V. Chernykh","doi":"10.1134/S1063785024340017","DOIUrl":"10.1134/S1063785024340017","url":null,"abstract":"","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"83 - 83"},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142409139","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":"Erratum to: Changes in Roughness and Microhardness of ShKh15 Steel after Pulsed Plasma Flow Treatment","authors":"A. K. Kutukov,&nbsp;A. A. Sergeechev,&nbsp;M. A. Miller,&nbsp;V. V. Gaponova","doi":"10.1134/S1063785024340030","DOIUrl":"10.1134/S1063785024340030","url":null,"abstract":"","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 1","pages":"85 - 85"},"PeriodicalIF":0.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415150","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":"Computational Modeling of the Scenario of Resumption of Covid-19 Waves under Pulse Evolution in New Omicron Lines","authors":"A. Yu. Perevaryukha","doi":"10.1134/S1063785024700433","DOIUrl":"10.1134/S1063785024700433","url":null,"abstract":"&lt;p&gt;The new COVID-19 waves in 2024 are oscillatory modes with different characteristics than those that we modeled in 2021. The global dynamics of SARS-CoV-2 infections changed its oscillation mode twice: after the global peak of Omicron BA.1 in the spring of 2022 and in December 2023 because of the appearance of the Pirola evolutionary branch. The SARS-CoV-2 outbreaks in the spring of 2024 differ from the fluctuations in the first two phases of the pandemic and waves of infections in the third phase, which began after the spread of the first version of Omicron in the winter of 2022. In the Pirola dominant branch, the situation was repeated in 2023. In 5 months, more than a dozen weak strains from the JN/KP subbranches, which became regional, were formed. The local dominant variants from the Pirola branch were again active in the regions. As a result, after the spread of the original Omicron faded, the epidemic process was restarted with new properties. The JN branch was estimated by us as having no evolutionary prospects according to the growth dynamics of its share among all infections. The reason for the aggravation of the epidemic situation is not only JN antibody evasion, but also reinfection. The spread of chronic post-Covid syndrome with a specific immunodeficiency condition has been noted. Most of the reported COVID-19 diseases in hospitals in 2024 are severe repeated infections. After the global Omicron BA.1 wave, the formation and attenuation of the wave series of local epidemics became asynchronous in nature. The continued emergence of new strains in the regions in the spring of 2024 necessitates forecasts of new methods of formal description by mathematical means of the epidemic evolution. The author consistently develops a method of computational modeling of the transformations of nonlinear oscillations in biophysical systems by analogy with discontinuous processes in technical physics. A comparative analysis of the differences in the development of the COVID epidemic waves in terms of hospitalization and mortality rates in the United Kingdom, Japan, and New Zealand has been carried out. There are different scenarios and forms of oscillatory dynamics in infections and mortality in terms of frequency, duration of COVID waves, and pauses between peaks. We have classified the scenarios according to the characteristic features of nonlinear dynamics. We have shown that the fading trend after the primary peak is easily destroyed by a mass infection event, thus causing an outbreak and a new mode of fluctuations. A method for modeling the impulse development of the epidemic based on equations with the threshold regulation functions and the choice of the forms for the situational functions damping the amplitude of infection waves has been proposed. In a hybrid structure on the right-hand side of the equations, we have indicated the rearrangements that determine the shape of the oscillating attenuation of the number of infections during evoluti","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"50 3","pages":"323 - 340"},"PeriodicalIF":0.8,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585874","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}