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

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Method of Incoherent Decomposition in the Theory of Kinematic Dynamo 运动发电机理论中的非相干分解方法
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711675
A. S. Il’yn, A. V. Kopyev, V. A. Sirota, K. P. Zybin
{"title":"Method of Incoherent Decomposition in the Theory of Kinematic Dynamo","authors":"A. S. Il’yn,&nbsp;A. V. Kopyev,&nbsp;V. A. Sirota,&nbsp;K. P. Zybin","doi":"10.1134/S1062873825711675","DOIUrl":"10.1134/S1062873825711675","url":null,"abstract":"<p>The incoherent decompositions method considered in the paper allows to describe intermediate asymptotics of perturbation growth in the theory of kinematic dynamo and the theory of passive scalar transport. This approach gives a new insight into the nature of dynamo at large Prandtl numbers.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1039 - 1044"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1062873825711675.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetic Field Structures Generated by Accretion Disc Dynamo 吸积盘发电机产生的磁场结构
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711778
E. A. Mikhailov, M. V. Frolova, E. N. Zhikhareva
{"title":"Magnetic Field Structures Generated by Accretion Disc Dynamo","authors":"E. A. Mikhailov,&nbsp;M. V. Frolova,&nbsp;E. N. Zhikhareva","doi":"10.1134/S1062873825711778","DOIUrl":"10.1134/S1062873825711778","url":null,"abstract":"<p>Magnetic fields play an important role in the structure and evolution of accretion disks. There are strong arguments in favor of the fact that they are related to the action of the dynamo mechanism. The structure of the magnetic field that can be obtained using various approximations is discussed. Particular attention is paid to the possibility of the emergence of essentially non-axisymmetric solutions.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1104 - 1110"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144015","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
Numerical Study of the Effect of the Electrical Conductivity of a Pipe’s Wall on the Flow of a Modeled Salt Melt during an Upward Flow in a Transverse Magnetic Field 横向磁场作用下，管壁电导率对模拟盐熔体向上流动影响的数值研究
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S106287382571181X
R. F. Rakhimov, N. Yu. Pyatnitskaya, E. A. Belavina, I. A. Belyaev
{"title":"Numerical Study of the Effect of the Electrical Conductivity of a Pipe’s Wall on the Flow of a Modeled Salt Melt during an Upward Flow in a Transverse Magnetic Field","authors":"R. F. Rakhimov,&nbsp;N. Yu. Pyatnitskaya,&nbsp;E. A. Belavina,&nbsp;I. A. Belyaev","doi":"10.1134/S106287382571181X","DOIUrl":"10.1134/S106287382571181X","url":null,"abstract":"<p>Results are presented from a numerical study of the flow of an electrically conductive fluid under the influence of a transverse magnetic field, allowing for the varying electrical conductivity of the wall of a round pipe measuring 40 × 2 mm. The considered fluid is a simulated salt melt (a 20% aqueous solution of potassium hydroxide) whose concentration allows the maximum value of the Hartmann number to be reached.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1130 - 1134"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143976","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
Studying the Controlled Motion of a Magnetically Active Object in a Viscous Medium 磁性活动物体在粘性介质中的受控运动研究
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S106287382571178X
A. V. Malchikov, S. F. Yatsun, P. A. Ryapolov, E. A. Sokolov
{"title":"Studying the Controlled Motion of a Magnetically Active Object in a Viscous Medium","authors":"A. V. Malchikov,&nbsp;S. F. Yatsun,&nbsp;P. A. Ryapolov,&nbsp;E. A. Sokolov","doi":"10.1134/S106287382571178X","DOIUrl":"10.1134/S106287382571178X","url":null,"abstract":"<p>The authors study the motion of a magnetically active object in a channel filled with a viscous fluid under the action of a magnetic field of a permanent magnet. A mathematical model and results from numerical and full-scale experiments are presented at different parameters of the magnetically-controlled motion of an object.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1111 - 1117"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143983","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
Non-Conservative Cascades in MHD Turbulence MHD湍流中的非保守级联
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711699
P. Frick, A. V. Shestakov
{"title":"Non-Conservative Cascades in MHD Turbulence","authors":"P. Frick,&nbsp;A. V. Shestakov","doi":"10.1134/S1062873825711699","DOIUrl":"10.1134/S1062873825711699","url":null,"abstract":"<p>According to Kolmogorov’s hypothesis, in turbulent flows at large Reynolds numbers, there is an extended inertial range of scales in which neither external nor viscous forces play an appreciable role, and all statistical properties are determined by the rate of kinetic energy dissipation. Turbulent flows in which the effect of external forces on scales corresponding to the inertial range is of fundamental importance are common in nature. The usual integrals of motion (e.g., the energy of velocity fluctuations and hydrodynamic helicity) cease to exist, and other quadratic quantities that include scale dependence become integrals of motion. At the same time, cascade processes become non-conservative from the viewpoint of the usual integrals of motion. This idea is developed in the context of shell models of MHD-turbulence and allows special regimes of cascade processes in MHD-turbulence to be described.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1052 - 1057"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143985","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
Unsteady Fluctuations of a Liquid Metal Flow in a Closed Volume inside an Alternating Magnetic Field 交变磁场下封闭体内液态金属流动的非定常波动
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711821
A. O. Poluyanov, I. V. Kolesnichenko
{"title":"Unsteady Fluctuations of a Liquid Metal Flow in a Closed Volume inside an Alternating Magnetic Field","authors":"A. O. Poluyanov,&nbsp;I. V. Kolesnichenko","doi":"10.1134/S1062873825711821","DOIUrl":"10.1134/S1062873825711821","url":null,"abstract":"<p>An experimental and numerical study is performed on the fluctuations of a liquid metal flow under the action of electromagnetic forces in a closed volume. The flow is unsteady in the range of considered dimensionless parameters. The region of a solenoid exhibits the most pronounced velocity fluctuations. The amplitude and range of the fluctuations grow along with the Hartmann number.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1135 - 1140"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143747","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
Experimental Verification of Couette–Poiseuille Flow of a Magnetic Fluid Filling the Coaxial Gap between the Inner Magnetic and Outer Nonmagnetic Walls 磁流体填充内、外非磁壁同轴间隙时的库埃-泊泽维尔流动实验验证
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711705
A. S. Ivanov, M. A. Koskov, S. A. Somov
{"title":"Experimental Verification of Couette–Poiseuille Flow of a Magnetic Fluid Filling the Coaxial Gap between the Inner Magnetic and Outer Nonmagnetic Walls","authors":"A. S. Ivanov,&nbsp;M. A. Koskov,&nbsp;S. A. Somov","doi":"10.1134/S1062873825711705","DOIUrl":"10.1134/S1062873825711705","url":null,"abstract":"<p>An experimental investigation was made of the viscous friction of the coaxial layer of a magnetic fluid between the inner wall of a nonmagnetic tube and a cylindrical assembly of permanent magnets during translational motion of the latter. The results of measurements of friction coefficient were compared with the results of calculations within the framework of analytical models. It was shown that the model prohibiting the flow of the magnetic fluid from the gap gives the best estimate of the friction coefficient. Several series of experiments on laboratory models differing in geometrical dimensions and aspect ratio of magnetic bodies have accumulated experimental data confirming the type of Couette–Poiseuille hydrodynamic flow in the system under study.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1058 - 1065"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144010","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
Characteristics of a Liquid Metal Flow Generated by a Travelling Magnetic Field in a Hollow Cylindrical Channel and a Channel with a Coaxial Insert 行磁场在空心圆柱通道和同轴嵌件通道中产生的液态金属流动特性
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711845
I. V. Kolesnichenko, I. I. Mitropolit, E. Golbraikh
{"title":"Characteristics of a Liquid Metal Flow Generated by a Travelling Magnetic Field in a Hollow Cylindrical Channel and a Channel with a Coaxial Insert","authors":"I. V. Kolesnichenko,&nbsp;I. I. Mitropolit,&nbsp;E. Golbraikh","doi":"10.1134/S1062873825711845","DOIUrl":"10.1134/S1062873825711845","url":null,"abstract":"<p>The liquid metal velocities and the processes of formation of the reversal flow in a hollow cylindrical channel and a cylindrical channel with an insert in different flow modes are compared. Velocity profiles and pressure drop–flow rate characteristic are obtained. It is shown that, at the same electromagnetic force, the metal velocity and flow rate in the channel with an insert are higher than in the cylindrical channel due to a decrease in the contribution of the reversal flow.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1148 - 1153"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144017","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
Induction Sensor for Controlling the Boundary Position and Electrical Conductivity of a Medium 用于控制介质边界位置和电导率的感应传感器
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-16 DOI: 10.1134/S1062873825711857
A. A. Bondarenko, V. A. Eltishchev, I. V. Kolesnichenko
{"title":"Induction Sensor for Controlling the Boundary Position and Electrical Conductivity of a Medium","authors":"A. A. Bondarenko,&nbsp;V. A. Eltishchev,&nbsp;I. V. Kolesnichenko","doi":"10.1134/S1062873825711857","DOIUrl":"10.1134/S1062873825711857","url":null,"abstract":"<p>An induction sensor is created for controlling the boundary and electrical conductivity of a medium. A refined mathematical model of the device is developed. The dependence of the sensor’s signal on the distance to an electrically conductive cylinder and the position of its upper boundary are obtained experimentally and numerically. The behavior of the system’s response is studied using media with different electrical conductivity: copper, duralumin, stainless steel, and lead–tin cylinders with different mass fractions of copper powder.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 7","pages":"1154 - 1160"},"PeriodicalIF":0.48,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143977","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
Diurnal Wave of the Ground-Level Electric Field of Fair Weather in Mountains and Its Influence on the Muon Intensity 山地晴天地面电场日波及其对μ子强度的影响
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2025-07-15 DOI: 10.1134/S1062873825711201
N. S. Khaerdinov
{"title":"Diurnal Wave of the Ground-Level Electric Field of Fair Weather in Mountains and Its Influence on the Muon Intensity","authors":"N. S. Khaerdinov","doi":"10.1134/S1062873825711201","DOIUrl":"10.1134/S1062873825711201","url":null,"abstract":"<p>A diurnal wave of the ground-level electric field of nonstandard type is regularly observed at the <i>Carpet</i> array of the Baksan Neutrino Observatory of the Institute for Nuclear Research of the Russian Academy of Sciences (43.3° N, 42.7° E) located in a mountain gorge at an altitude of 1.7 km above sea level. In a period of July 29 to September 6, 2019, which included two magnetic storms, it was observed that the diurnal wave of the muon intensity with an energy of more than 100 MeV registered by the array changed its sign. In this period, the diurnal behavior of the pressure, temperature, and ground-level electric field did not change. Using the case of inversion of the diurnal wave, we estimated the contribution of the regularly measured disturbance of the atmospheric electric field to the muon intensity variations. During the study, previously unnoticed morning–evening variations of terrestrial origin were revealed.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 6","pages":"810 - 816"},"PeriodicalIF":0.48,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165771","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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