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Asymmetric Effects on Escape Rates of Bistable System 被引量:2
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作者 王参军 戴祖诚 梅冬成 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第12期1041-1044,共4页
The asymmetric effects on the escape rates from the stable states x±in the bistable system are analyzed. The results indicate that the multiplicative noise and the additive noise always enhance the particle escap... The asymmetric effects on the escape rates from the stable states x±in the bistable system are analyzed. The results indicate that the multiplicative noise and the additive noise always enhance the particle escape from stable states x±of bistable.However,the asymmetric parameter r enhances the particle escape from stable state x_+,and holds back the particle escape from stable state x_-. 展开更多
关键词 bistable system escape rate asymmetric effects noise
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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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作者 HengLe Du Xing Cao +5 位作者 BinBin Ni Song Fu Xin Ma XiaoTong Yun MinYi Long Qiong Luo 《Earth and Planetary Physics》 EI CSCD 2022年第6期536-545,共10页
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 ... 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. 展开更多
关键词 Martian-induced magnetotail atmospheric heavy ion outflow corotating interaction region escape rate
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Escape rate of an active Brownian particle in a rough potential
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作者 Yating Wang Zhanchun Tu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第12期118-123,共6页
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 ... 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. 展开更多
关键词 escape rate active Brownian particle rough potential effective potential
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Transition State Theory Rate in Nonlinear Environment: the Under-damping Case
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作者 ZHAO Jiang-Lin BAO Jing-Dong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第4X期752-756,共5页
We investigate the escape behavior of systems governed by the one-dimensional nonlinear Kramers' equation δW/δt = -vδW/δx + (f'(x)/m)(δW/δv) + γδ(vW)/δv + (γκBT/m)(δ2W^μ/δv^2), where f(... We investigate the escape behavior of systems governed by the one-dimensional nonlinear Kramers' equation δW/δt = -vδW/δx + (f'(x)/m)(δW/δv) + γδ(vW)/δv + (γκBT/m)(δ2W^μ/δv^2), where f(x) is a metastable potential and μ an anomalous exponent. We obtain an expression for the transition state theory escape rate, whose predictions are in good agreement with numerical simulations. The results exhibit the anomalies due to the nonlinearity in W that the TST rate grows with T and drops as μbecomes large at a fixed T. Indeed, particles in the subdiffusive media (μ 〉 1) can escape over the barrier only when T is above a critical value, while there does not exist this confinement in the superdiffusive media (μ 〈 1). 展开更多
关键词 Kramers' escape rate nonlinear Fokker-Planck equation anomalous diffusion
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Diffusion of a Brownian Particle in a Periodic Potential with Memory Friction
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作者 Meng Hu Zhanwu Bai 《Journal of Modern Physics》 CAS 2022年第8期1204-1211,共8页
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... 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. 展开更多
关键词 escape rate Finite Barrier Memory Friction
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Rate of the phase transition for a charged anti-de Sitter black hole
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作者 Zhen-Ming Xu Bin Wu Wen-Li Yang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2023年第4期61-66,共6页
Phase transition is a core content of black hole thermodynamics. This study adopted Kramer’s escape rate method for describing the Brownian motion of particles in an external field to investigate the intensity of the... Phase transition is a core content of black hole thermodynamics. This study adopted Kramer’s escape rate method for describing the Brownian motion of particles in an external field to investigate the intensity of the phase transition between small and large black hole states. Some existing studies mostly focused on the formal analysis of the thermodynamic phase transition of black holes, but they neglected the detailed description of the phase transition process. Our results show that the phase transition between small and large black holes for charged anti-de Sitter(AdS) black holes presents serious asymmetric features, and the overall process is dominated by the transition from a small black hole to a large black hole. This study filled a research gap of a stochastic process analysis on the issue of the first-order phase transition rate in the Ad S black hole. 展开更多
关键词 black hole thermodynamics phase transition thermal potential Kramer’s escape rate
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