Biomedical subjects
Publications and source records attributed to Jing-hui Li.
We consider the escape over a fluctuating potential barrier with a three-state Markovian noise. The resonant activations (RA's) for the mean first-passage times as functions of the transition rates gamma(1), gamma(2), and gamma(3) of the three-state Markovian noise are obtained, respectively. The effect of the three values of the three-state Markovian noise on the RA's is investigated.
Chaotic noisy transport of electron pairs in a superconducting junction device (thermal-inertia ratchets) is investigated. The study shows that when the temperature is low enough, the transport of the electron pairs can be mainly chaotic; when the temperature is high enough, it can be mainly stochastic. By controlling the temperature and the amplitude of the input ac signal, the current of electron pairs can be reversed.
In this paper, with a special model, we investigate the spatially periodic stochastic system with locally coupled oscillators subject to a constant force F. A nonequilibrium second-order phase transition is found when F=0. This phase transition is reentrant when the additive noise is weak. With varying the constant force F, a continuous or discontinuous transition between the states with positive and negative mean fields (mu>0 and mu<0) is observed, which is not a phase transition. The mean field or current sometimes exhibits hysteresis as a function of F. With the variation of the force F, when hysteresis of the mean field or current versus F appears, a nonzero probability current with definite direction will occur at the point F=0. The correlation between the additive and multiplicative noises has an effect on the transitions and the transport.
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A superconducting junctions device is investigated in the case of the environmental perturbation. It is found that a net voltage can be produced, whose absolute value represents a phenomenon of resonance versus the additive noise strength, and may be negative, positive, and zero. By controlling the correlation between the additive and multiplicative noises, a reversal for the net voltage can be induced. The dc voltage versus the dc current is studied. It is shown that (1) with increasing the additive noise strength, the curve of the dc voltage versus the dc current is nearer and nearer to the one for the Ohmic theorem; (2) the behavior of the dc voltage versus the dc current can be manipulated by controlling the noise's strengths. In addition, we study the mean first passage time (MFPT) for the electron pair over a period of the potential, and find that the transition rate (i.e., inverse of the MFPT) can be suppressed by the positive correlations between the additive and multiplicative noises and show a minimum as the function of the noise's strengths.
This paper investigates systems driven by temporal-spatial noise using two models, i.e., a spatially periodic model, and a model with infinite globally coupled oscillators. The study shows that, for the first model, the temporal-spatial noise has a stronger effect on the transport of particles than the usual additive and multiplicative noise; for the second model, the temporal-spatial noise can restrict the appearance of the symmetry-breaking nonequilibrium phase transition, in contrast with the case when the system is driven by the usual multiplicative noise.
In the paper, we investigate the effect of asymmetry of the potential on stochastic resonance (SR) for a model with an asymmetric bistable potential and driven by additive noise, the signal-to-noise ratio (SNR) for a model with a monostable potential and driven by additive and multiplicative noises, and the SNR for a mean-field coupled model with infinite globally coupling oscillators driven by additive noises. It is shown that for the first model,the asymmetry of the potential can weaken the phenomenon of SR; for the second and third models, a SR induced by multiplicative noise and a different one caused by mean-field coupling are found.