Radiophysics and Quantum Electronics最新文献_第10页

Simulation of an Improved-Accuracy Monopulse Phase Direction Finder Based on an Adaptive Antenna Array 基于自适应天线阵列的更精确单脉冲相位寻向器的仿真分析

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2024-02-07 DOI: 10.1007/s11141-024-10290-2

A. C. Popov, V. F. Pimenov

引用次数: 0

Topological Scalar and Vector Laser Solitons 拓扑标量和矢量激光孤子

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-19 DOI: 10.1007/s11141-023-10285-5

N. A. Veretenov, N. N. Rosanov, S. V. Fedorov

引用次数: 0

Nonlinear Dynamics of Slipping Flows 滑动流的非线性动力学

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-19 DOI: 10.1007/s11141-023-10281-9

E. A. Kuznetsov, E. A. Mikhailov, M. G. Serdyukov

{"title":"Nonlinear Dynamics of Slipping Flows","authors":"E. A. Kuznetsov, E. A. Mikhailov, M. G. Serdyukov","doi":"10.1007/s11141-023-10281-9","DOIUrl":"10.1007/s11141-023-10281-9","url":null,"abstract":"We develop a new concept for the formation of behavior features of inviscid incompressible fluids on the rigid boundary due to breaking of slipping flows. The breaking possibility is related to the compressibility of such flows due to the boundary. For two- and three-dimensional inviscid Prandtl equations, we analytically obtain the criteria for a gradient catastrophe for slipping flows. For the two-dimensional Prandtl equations, breaking occurs for both the velocity component parallel to the boundary and the vorticity gradient. The explosive growth of the vorticity gradient correlates with the appearance of a jet in the direction perpendicular to the boundary. For the three-dimensional Prandtl flows, breaking (fold formation) leads to an explosive growth for both the symmetric part of the velocity-gradient tensor and its antisymmetric part, i.e., vorticity. The blow-up generation of vorticity is possible due to the fluid suction from the slipping flow with simultaneous formation of a jet perpendicular to the boundary. These factors can be considered as a tornado-formation mechanism. Within the framework of the two-dimensional Euler equations, we numerically study the problem of the formation of increasing velocity gradients for the flows between two parallel plates. It is revealed that on the rigid boundary, the maximum velocity gradient exponentially increases with time simultaneously with an increase in the vorticity gradient according to the double exponential law. This process is also accompanied by a jet formation in the direction perpendicular to the boundary.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 2-3","pages":"129 - 142"},"PeriodicalIF":0.8,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138742313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synchronization of Metastable Oscillations Arising in the Evolutionary Game of Two Populations 两个种群进化博弈中出现的可变振荡的同步性

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-14 DOI: 10.1007/s11141-023-10286-4

O. S. Vershinina, T. V. Rubtsova, I. Yu. Yastrebova, A. A. Plotnikov, S. V. Denisov, M. V. Ivanchenko

引用次数: 0

Theoretical Analysis of the Stability of the Single-Mode Generation Regime in the Gyrotron 陀螺仪中单模发生区稳定性的理论分析

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-14 DOI: 10.1007/s11141-023-10282-8

A. B. Adilova, N. V. Grigoryeva, A. G. Rozhnev, N. M. Ryskin

引用次数: 0

Polariton Phenomena in Superradiant Lasing with a Low-Q Asymmetric Fabry–Perot Cavity 低 Q 值不对称法布里珀罗腔超辐射激光中的极化子现象

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-14 DOI: 10.1007/s11141-023-10284-6

E. R. Kocharovskaya, Vl.V. Kocharovsky

引用次数: 0

Simulation of Nonlinear Processes in High-Q Microresonators in the Self-Injection Locking Regime with Account of Thermal Effects 模拟高 Q 值微谐振器在自注入锁定状态下的非线性过程并考虑热效应

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-14 DOI: 10.1007/s11141-023-10283-7

V. I. Pavlov, N. M. Kondratiev, V. E. Lobanov

引用次数: 0

On the Influence of Microbubbles on the Turbulence Induced by a Surface Wave 论微气泡对表面波引起的湍流的影响

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-13 DOI: 10.1007/s11141-023-10279-3

O. A. Druzhinin

{"title":"On the Influence of Microbubbles on the Turbulence Induced by a Surface Wave","authors":"O. A. Druzhinin","doi":"10.1007/s11141-023-10279-3","DOIUrl":"10.1007/s11141-023-10279-3","url":null,"abstract":"We use the direct numerical simulation (DNS) method to study the vortex structure of the near-surface water layer, which is saturated with air bubbles, in the presence of a stationary surface wave. A wave with a wavelength of 15 cm and a steepness of 0.2 (an amplitude of about 0.5 cm) and bubbles 400 μm in diameter (microbubbles) are considered. Complete three-dimensional fluid motion equations (Navier–Stokes equations) are solved by the DNS method simultaneously with the equations of motion of individual bubbles with allowance for their influence on the carrier flow. Under the influence of the surface wave, the flow in the near-surface layer becomes turbulent and characterized by the presence of vortex structures stretched along the wave propagation direction. To analyze the vortex structure of the flow, the instantaneous velocity gradient tensor is calculated, and its complex eigenvalues, whose imaginary part characterizes the local vorticity of the flow, are calculated, while filtering out the contribution of the purely shear component (vortex sheet). Average profiles of the eigenvalues and the fluctuations, which are obtained at the stage of the statistically stationary flow, show that the influence of the bubbles lead to intensification of small-scale vortices and turbulent pulsations in water.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 2-3","pages":"109 - 115"},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138685952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Stretching of Mesoscale Vortices into Filaments and their Distribution over the Ocean Surface 论中尺度涡旋在海洋表面的伸展成丝及其分布

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-13 DOI: 10.1007/s11141-023-10278-4

V. V. Zhmur, T. V. Belonenko, E. V. Novoselova, B. S. Suetin

{"title":"On the Stretching of Mesoscale Vortices into Filaments and their Distribution over the Ocean Surface","authors":"V. V. Zhmur, T. V. Belonenko, E. V. Novoselova, B. S. Suetin","doi":"10.1007/s11141-023-10278-4","DOIUrl":"10.1007/s11141-023-10278-4","url":null,"abstract":"We consider various aspects of interaction of vortices with a barotropic flow. When a vortex interacts with a flow, there exist three variants of the flow-core behavior: rotation, nutational oscillations, and unlimited stretching. In the first two cases, the vortex remains a localized formation, such that the ellipse semiaxes undergo oscillations near certain average values. In the third case, the shape of the vortex varies as follows: one horizontal axis increases indefinitely and the second horizontal axis tends to zero so that the vertical size of the vortex does not change and the vortex itself stretches into a filament in top view, remaining ellipsoidal. As a result, vortex formations, which are called filaments, emerge in the ocean. They emerge from the vortices which are initially almost circular in the horizontal plane and represent structures stretched in one direction and having nonzero vorticity. In this work, an analytical and graphical method for determining the regimes of behavior of three-dimensional ellipsoidal vortices is proposed for the first time for an inhomogeneous horizontal current which is linear with respect to the horizontal coordinates. Conditions for inevitable stretching of the vortices into filaments are studied. It is established that the vortex stretching is manifested in spots (domains) on 60–67% of the world ocean surface and the characteristic dimensions of these spots amount to about 200 km. The vortex stretching into filaments ensures energy pumping from mesoscale processes to submesoscale ones. According to the global oceanic reanalysis GLORYS12V1, the domain distributions in the World Ocean are plotted. It is shown that irrespective of the spatial-averaging scales, the integral area of regions in which the mesoscale vortices can stretch into filaments is dominant.","PeriodicalId":748,"journal":{"name":"Radiophysics and Quantum Electronics","volume":"66 2-3","pages":"93 - 108"},"PeriodicalIF":0.8,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138686072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two Ways to Generalize Gerstner Waves in the Theory of Waves in Deep Water 在深水波浪理论中推广格斯特纳波的两种方法

IF 0.8 4区地球科学

Radiophysics and Quantum Electronics Pub Date : 2023-12-13 DOI: 10.1007/s11141-023-10280-w

A. A. Abrashkin, E. N. Pelinovsky

引用次数: 0