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Bulletin of the Russian Academy of Sciences: Physics最新文献

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On the Simplest Solutions of the MHD Equations for the Total Magnetic Energy in the Convective Zone of Sun and Earth 日地对流区总磁能MHD方程的最简解
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711869
S. V. Starchenko, M. S. Kotelnikova
{"title":"On the Simplest Solutions of the MHD Equations for the Total Magnetic Energy in the Convective Zone of Sun and Earth","authors":"S. V. Starchenko,&nbsp;M. S. Kotelnikova","doi":"10.1134/S1062873825711869","DOIUrl":"10.1134/S1062873825711869","url":null,"abstract":"<p>Based on estimates of the characteristic values of the terms in the hydromagnetic dynamo equations, it was shown that a significant factor is the stabilizing nonlinearity inversely proportional to the electric current. Using the average value obtained for it, the simplest hydromagnetic model for magnetic energy was constructed, consisting of one nonhomogeneous linear ordinary differential equation.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1161 - 1164"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 Magnetic Field on the Spectra of Optical Phenomena in Magnetic Fluids with Different Aggregative Stability 磁场对不同聚集稳定性磁流体中光学现象光谱的影响
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711687
V. I. Vivchar’, C. V. Yerin
{"title":"Influence of Magnetic Field on the Spectra of Optical Phenomena in Magnetic Fluids with Different Aggregative Stability","authors":"V. I. Vivchar’,&nbsp;C. V. Yerin","doi":"10.1134/S1062873825711687","DOIUrl":"10.1134/S1062873825711687","url":null,"abstract":"<p>The spectra of birefringence, dichroism, and transmission of magnetic fluids with different aggregative stability under the influence of a constant magnetic field were experimentally studied. A change in the complex refractive index of aggregates of magnetite nanoparticles during their growth was discovered. An interpretation of the spectral features of optical anisotropy and light transmission in aggregation-unstable magnetic fluids was proposed.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1045 - 1051"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interaction between Multi-Directional Rotating MHD Flows of Liquid Metal in a Cylindrical Channel 圆柱形通道内液态金属多向旋转MHD流动的相互作用
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711894
V. S. Ozernykh, E. Golbraikh, I. V. Kolesnichenko
{"title":"Interaction between Multi-Directional Rotating MHD Flows of Liquid Metal in a Cylindrical Channel","authors":"V. S. Ozernykh,&nbsp;E. Golbraikh,&nbsp;I. V. Kolesnichenko","doi":"10.1134/S1062873825711894","DOIUrl":"10.1134/S1062873825711894","url":null,"abstract":"<p>The stability of the mixing layer in a cylindrical cell between two counter-rotating vortex flows created by electromagnetic forces is investigated numerically. The flow is described during the development of instability. The resulting Kelvin–Helmholtz instability becomes a source of small disturbances and leads to turbulent mixing of the liquid. The second and third modes of flow make the greatest contribution to the development of disturbances.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1175 - 1180"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synchronization Effect in a Nonlinear Solar Dynamo Model 非线性太阳能发电机模型的同步效应
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711882
R. A. Stepanov, A. V. Gladkikh, G. A. Tashkinov
{"title":"Synchronization Effect in a Nonlinear Solar Dynamo Model","authors":"R. A. Stepanov,&nbsp;A. V. Gladkikh,&nbsp;G. A. Tashkinov","doi":"10.1134/S1062873825711882","DOIUrl":"10.1134/S1062873825711882","url":null,"abstract":"<p>The properties of the main solar activity cycle were studied. Using observational data, one can detect a significant synchronization of the dynamo process with a strictly periodic process. The results of numerical modeling showed that synchronization of the dynamo wave with the periodic part of the alpha effect can arise in a significantly nonlinear dynamo model.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1170 - 1174"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of the Single-Step and Multistep Approaches to Forecast of the Solar Activity Index 单步法和多步法预报太阳活动指数的比较
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711870
V. Kisielius, E. A. Illarionov, R. A. Stepanov, K. M. Kuzanyan
{"title":"Comparison of the Single-Step and Multistep Approaches to Forecast of the Solar Activity Index","authors":"V. Kisielius,&nbsp;E. A. Illarionov,&nbsp;R. A. Stepanov,&nbsp;K. M. Kuzanyan","doi":"10.1134/S1062873825711870","DOIUrl":"10.1134/S1062873825711870","url":null,"abstract":"<p>By the example of a problem of forecasting daily values of solar activity index, three different approaches to forecasting a time series of the solar activity index were compared: iterations of a single-step model, an independent single-step forecast for each subsequent month, and a single multistep forecast for the entire period. As a model, each approach uses a machine learning model based on a neural network, as well as an auxiliary theoretical series of solutions, which is obtained from a physical model of solar dynamo.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1165 - 1169"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laboratory and Numerical Modeling of the Structure of Shock Waves of Jets from Young Stars 年轻恒星喷流激波结构的实验室与数值模拟
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711833
I. Yu. Kalashnikov, V. S. Beskin, V. I. Krauz
{"title":"Laboratory and Numerical Modeling of the Structure of Shock Waves of Jets from Young Stars","authors":"I. Yu. Kalashnikov,&nbsp;V. S. Beskin,&nbsp;V. I. Krauz","doi":"10.1134/S1062873825711833","DOIUrl":"10.1134/S1062873825711833","url":null,"abstract":"<p>The use of <i>Z</i>-pinch facilities makes it possible to carry out well-controlled and diagnosable laboratory experiments to study laboratory jets having scaling parameters close to those of jets from young stars. It was found that a low-concentration region is formed after the first supersonic ejection, allowing subsequent ejections to propagate collimated. An exact solution of the generalized Grad–Shafranov equation for axisymmetric plasma flows was also obtained, and the interaction of the plasma ejection with the gas was numerically modeled, which agrees well with the experimental data.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1141 - 1147"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Role of Magnetorotational Instability in the Occurrence of Magnetic Field on the Periphery of the Galactic Disk 磁旋不稳定性在银盘外围磁场发生中的作用
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711791
T. T. Khasaeva, E. A. Mikhailov
{"title":"The Role of Magnetorotational Instability in the Occurrence of Magnetic Field on the Periphery of the Galactic Disk","authors":"T. T. Khasaeva,&nbsp;E. A. Mikhailov","doi":"10.1134/S1062873825711791","DOIUrl":"10.1134/S1062873825711791","url":null,"abstract":"<p>The occurrence of the magnetic fields of galaxies is usually explained by the action of the dynamo mechanism. Nevertheless, at distances of the order of 15–20 kpc, the action of the dynamo is significantly weakened. The magnetic field in these regions can be described by other mechanisms, for example, magnetorotational instability. In this work, solutions that correspond to both the mechanisms of dynamo and magnetorotational instability have been found.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1118 - 1123"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamics of a Chain of Interacting Magnetic Particles in a One-Dimensional Periodic Energy Landscape 一维周期能量景观中磁粒子相互作用链的动力学
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711742
M. N. Kourov, A. E. Samoilova, A. V. Straube
{"title":"Dynamics of a Chain of Interacting Magnetic Particles in a One-Dimensional Periodic Energy Landscape","authors":"M. N. Kourov,&nbsp;A. E. Samoilova,&nbsp;A. V. Straube","doi":"10.1134/S1062873825711742","DOIUrl":"10.1134/S1062873825711742","url":null,"abstract":"<p>We explore the dynamics of a one-dimensional chain of paramagnetic colloidal particles in a periodic potential. The model accounts for a constant external force, along with magnetic dipolar attraction and hard-core repulsive interactions between particles. Numerical simulations reveal the emergence of a traveling kink – a chain defect propagating along the chain. We show that the kink emerges beyond a critical force threshold and identify parameter regimes corresponding to distinct dynamic modes such as a pinned kink, a running kink, a cluster kink, and chain drift.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1086 - 1092"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vortex Flow of Electrolytes Caused by the Interaction of Electric Current and Magnetic Field in a Cylindrical Cell 圆柱槽内电流与磁场相互作用引起的电解液涡旋流动
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711808
E. A. Mikhailov, A. P. Stepanova, I. O. Teplyakov
{"title":"Vortex Flow of Electrolytes Caused by the Interaction of Electric Current and Magnetic Field in a Cylindrical Cell","authors":"E. A. Mikhailov,&nbsp;A. P. Stepanova,&nbsp;I. O. Teplyakov","doi":"10.1134/S1062873825711808","DOIUrl":"10.1134/S1062873825711808","url":null,"abstract":"<p>The interaction of an external magnetic field with an electric current in a conducting medium may give rise to vortex flows. A rotating flow in an external magnetic field was considered in a cylindrical vessel, where one of the electrodes is the bottom of the vessel, and the second electrode has small dimensions and is immersed in the conducting liquid from above. Both theoretical and experimental results were obtained, specifically, the dependence of the velocity on the radius of the upper electrode, an analytical solution for the potential and velocity, as well as its highest-order mode.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1124 - 1129"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative Analysis of Experimental Methods for Measuring the Magnetoviscous Effect 磁粘性效应测量实验方法的比较分析
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711766
E. V. Shel’deshova, A. A. Churaev, E. V. Bondar’, P. A. Ryapolov
{"title":"Comparative Analysis of Experimental Methods for Measuring the Magnetoviscous Effect","authors":"E. V. Shel’deshova,&nbsp;A. A. Churaev,&nbsp;E. V. Bondar’,&nbsp;P. A. Ryapolov","doi":"10.1134/S1062873825711766","DOIUrl":"10.1134/S1062873825711766","url":null,"abstract":"<p>The viscosity of magnetic fluids was studied using a capillary viscometer of our own design and the method of oscillating volume of magnetic fluid in a magnetic field. Samples were tested on various carrier liquids—kerosene and polyethylsiloxane—with a volume concentration φ of the solid phase from 19 to 2.5%. The developed setup based on a capillary viscometer allows viscosity measurements in the magnetic field strength range from 20 to 350 kA/m. Measurements based on oscillations of the system occur in the range from 150 to 900 kA/m. It was experimentally established that the results obtained using these methods agree with each other, which allows us to conclude that both methods provide an identical estimate of the viscosity of a magnetic fluid in a magnetic field.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1099 - 1103"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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