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Stochastic Resonance in System with On-Off Intermittency

100%
Krawiecki A.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 6
1101-1108
EN
Stochastic resonance in a chaotic threshold-crossing system exhibiting on-off intermittency and attractor bubbling: the logistic map with the control parameter varying randomly or chaotically in time is studied in the case of weak additive and multiplicative periodic forcing. In both cases signal-to-noise ratio shows dependence on the forcing frequency; in the case of multiplicative forcing this dependence appears even for very small frequencies. It is shown that this is a result of a very long characteristic time scale, typical of systems with on-off intermittency.
2
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A Study of Time and Space Correlations in Field Emission Current Fluctuations with a Fiber-Optical Technique

100%
Dadykin A., Naumovets A.
Acta Physica Polonica A
|
1992
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vol. 81
|
issue 1
131-143
EN
A new technique of measurements of field emission current fluctuations is proposed. The technique uses fiber optics and offers such advantages as the possibility to easily vary the geometry of the probed regions and the distance between them on the field emitter. The correlation functions of field emission current fluctuations have been measured with this technique for O/W(110), H/W(110), Si(111) and Na/Si(111) systems. Some data on surface diffusion coefficients are derived from the measurements.
3
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Arbitrary Order Perturbation Expansion Applied to Steady-State Nonlinear Kerr Effect Relaxations in Coupled AC and DC Weak Fields

100%
Hounkonnou M., Ronveaux A.
Acta Physica Polonica A
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1992
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vol. 82
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issue 3
425-441
EN
The steady state response of the nonlinear Kerr effect to a small ac field superimposed on a dc field is analysed using second-order perturbation theory. We justify the truncature effect entailed in solving the infinite set of differential equations that yield the electric polarization and birefringence, and hence draw inferences from the appearance of single and double harmonics as the fundamental frequencies of nonlinear Kerr effect. The addition of small inertial effects in the solution of this phenomenon results in the appearance of a contribution within the master matrix which is proportional to the square of the frequency corresponding to the order of perturbation. The study is based on the Smoluchowski equation of rotational Brownian motion.
4
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Optical Bistability Induced by Additive Colored Noise in the Exciton-Biexciton System

80%
Gonţia I., Rotaru A.
Acta Physica Polonica A
|
1995
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vol. 87
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issue 6
911-917
EN
This paper predicts optical bimodality induced by external additive noise with a finite bandwidth, in the exciton-biexciton system.
5
Content available remote

Simulations of Noise-Free Stochastic Resonance in Spin-Wave Chaos

80%
Krawiecki A., Reibold E., Benner H., Sukiennicki A.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 5
975-978
EN
Numerical simulations of noise-free stochastic resonance and aperiodic stochastic resonance in chaotic ferromagnetic resonance are presented. The model, based on three-magnon interactions between the externally excited uniform mode and pairs of spin waves, shows on-off intermittency. The rf magnetic field amplitude is slowly modulated by a small periodic or aperiodic signal, and the output signal, which reflects the occurrence of laminar phases and bursts in the time series of spin-wave amplitudes, is analyzed. On variation of the dc magnetic field the signal-to-noise ratio of the output signal and the correlation function between modulation and output signal pass a maximum, which indicates the occurrence of periodic and aperiodic stochastic resonance, respectively. The role of thermal magnon excitations in the occurrence of this maximum is clarified. The results are compared with experimental findings obtained in other types of intermittency.
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