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Meccanica - This paper intends to establish a unified theory of structures based on the micropolar elasticity (ME). ME allows taking into consideration the microstructure of the material, through... 相似文献
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G. Augello D. Valenti B. Spagnolo 《The European Physical Journal B - Condensed Matter and Complex Systems》2010,78(2):225-234
The role of thermal and non-Gaussian noise on the dynamics
of driven short overdamped Josephson junctions is studied. The mean
escape time of the junction is investigated considering Gaussian,
Cauchy-Lorentz and Lévy-Smirnov probability distributions of the
noise signals. In these conditions we find resonant activation and
the first evidence of noise enhanced stability in a metastable
system in the presence of Lévy noise. For Cauchy-Lorentz noise
source, trapping phenomena and power law dependence on the noise
intensity are observed. 相似文献
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G. Augello D. Valenti A. L. Pankratov B. Spagnolo 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,70(1):145-151
We study the transient statistical properties of short and long Josephson junctions under the influence of thermal and correlated
fluctuations. In particular, we investigate the lifetime
of the superconductive metastable state finding the presence of noise induced phenomena. For short Josephson junctions we
investigate the lifetime as a function both of the frequency of the current driving signal and the noise intensity and we
find how these noise-induced effects are modified by the presence of a correlated noise source. For long Josephson junctions
we integrate numerically
the sine-Gordon equation calculating the lifetime as a function of the length of the junction both for inhomogeneous and homogeneous
bias current distributions. We obtain a non-monotonic behavior of the lifetime as a function of the frequency of the current
driving signal and the correlation time of the noise. Moreover we find two maxima in the non-monotonic behaviour of the mean
escape time as a
function of the correlated noise intensity. 相似文献
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D. Valenti G. Augello B. Spagnolo 《The European Physical Journal B - Condensed Matter and Complex Systems》2008,65(3):443-451
We analyze the dynamics of the FitzHugh-Nagumo (FHN) model in the presence of colored noise and a periodic signal. Two cases
are considered: (i) the dynamics of the membrane potential is affected by the noise, (ii) the slow dynamics of the recovery
variable is subject to noise. We investigate the role of the colored noise on the neuron dynamics by the mean response time
(MRT) of the neuron. We find meaningful modifications of the resonant activation (RA) and noise enhanced stability (NES) phenomena
due to the correlation time of the noise. For strongly correlated noise we observe suppression of NES effect and persistence
of RA phenomenon, with an efficiency enhancement of the neuronal response. Finally we show that the self-correlation of the
colored noise causes a reduction of the effective noise intensity, which appears as a rescaling of the fluctuations affecting
the FHN system. 相似文献
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