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escape rate of an active Brownian particle in a rough potential

Communications in Theoretical Physics 2022年第12期74卷 118-123页

作者： Yating Wang Zhanchun Tu Department of Physics Beijing Normal UniversityBeijing 100875China

We discuss the escape problem with the consideration of both the activity of particles and the roughness of potentials.We derive analytic expressions for the escape rate of an active Brownian particle in two types of rough potentials by employing the effective equilibrium approach and the Zwanzig method.We find that activity enhances the escape rate,but both the oscillating perturbation and the random amplitude hinder escaping.

关键词： escape rate active Brownian particle rough potential effective potential

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Distribution of O^(+)and O_(2)^(+) fluxes and their escape rates in the near-Mars magnetotail:A survey of MAVEN observations

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Earth and Planetary Physics 2022年第6期6卷 536-545页

作者： HengLe Du Xing Cao BinBin Ni Song Fu Xin Ma XiaoTong Yun MinYi Long Qiong Luo Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China Chinese Academy of Sciences Center for Excellence in Comparative PlanetologyHefei 230026China

Tailward ion outflows in the Martian-induced magnetotail are known to be one of the major channels for Martian atmospheric escape.On the basis of nearly 6.5 years of observations from the Mars Atmosphere and Volatile EvolutioN(MAVEN)mission,we investigate the statistical distribution of tailward and Marsward fluxes of heavy ions(i.e.,O^(+),and O_(2)^(+))in the near-Mars magnetotail and explore their characteristic responses to the corotating interaction region(CIR),solar wind dynamic pressure,and local magnetic field intensity.Our results show that the tailward fluxes of oxygen ions and molecular oxygen ions in the magnetotail are significantly greater than their Marsward fluxes and that the tailward flux of molecular oxygen ions is generally larger than that of oxygen ions.Furthermore,the tailward ion flux distribution exhibits dependence on the CIR,solar wind dynamic pressure,and local magnetic field strength in a manner stronger than the Marsward ion flux distribution.According to the distribution of tailward ion fluxes,we calculate the corresponding escape rates of heavy ions and show that when the CIR occurs,the total escape rates of oxygen ions and molecular oxygen ions increase by a factor of~2 and~1.2,respectively.We also find that the escape rates of heavy ions increase with the enhancement of solar wind dynamic pressure,whereas the overall effect of the local magnetic field is relatively weak.Our study has important implications for improved understanding of the underlying mechanisms responsible for the Martian atmospheric escape and the evolution of the Martian atmospheric climate.

关键词： Martian-induced magnetotail atmospheric heavy ion outflow corotating interaction region escape rate

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Diffusion of a Brownian Particle in a Periodic Potential with Memory Friction

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Journal of Modern Physics 2022年第8期13卷 1204-1211页

作者： Meng Hu Zhanwu Bai Department of Mathematics and Physics North China Electric Power University Baoding China

This study investigates the diffusive motion of a Brownian particle in a 1D periodic potential. The reactive flux theory for finite barriers and memory friction is developed to calculate the escape rate in the spatial diffusion regime. The diffusion coefficient is obtained in terms of the jump-model. The theoretical results agree well with the Langevin simulation results. The method can be generalized to other colored noises with Gaussian distribution.

关键词： escape rate Finite Barrier Memory Friction

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The Availability of Logical Operation for a Nonlinear Bistable System Induced by Dichotomous Noise

The Availability of Logical Operation for a Nonlinear Bistab...

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第十四届全国非线性振动暨第十一届全国非线性动力学和运动...

作者： Yong Xu Xiaoqin Jin Huiqing Zhang Tingting Yang Department of Applied Mathematics Northwestern Polytechnical University

Based on stochastic resonance the concept of logical stochastic resonance was put forward.Instead of a continuous system driven by Gaussian white noise here we mainly studied a nonlinear bistable system with two thres... 详细信息

关键词： Nonlinear bistable system escape rate logical stochastic resonance dichotomous noise correlation time

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