Search results for "Noise-induced phenomena"

showing 3 items of 3 documents

Environmental Metal Pollution Considered as Noise: Effects on the Spatial Distribution of Benthic Foraminifera in two Coastal Marine Areas of Sicily …

2008

We analyze the spatial distributions of two groups of benthic foraminifera (Adelosina spp. + Quinqueloculina spp. and Elphidium spp.), along Sicilian coast, and their correlation with six different heavy metals, responsible for the pollution. Samples were collected inside the Gulf of Palermo, which has a high level of pollution due to heavy metals, and along the coast of Lampedusa island (Sicily Channel, Southern Mediterranean), which is characterized by unpolluted sea waters. Because of the environmental pollution we find: (i) an anticorrelated spatial behaviour between the two groups of benthic foraminifera analyzed; (ii) an anticorrelated (correlated) spatial behaviour between the first …

Mediterranean climatePollutionSettore FIS/02 - Fisica Teorica Modelli E Metodi Matematicimedia_common.quotation_subjectMultiplicative noiseEnvironmental pollutionPopulation dynamicSpatial distributionSettore CHIM/12 - Chimica Dell'Ambiente E Dei Beni CulturaliForaminiferaLotka–VolterraQuantitative Biology - Populations and Evolutionmedia_commonbiologyEcologyEcological ModelingBenthic foraminiferaPopulations and Evolution (q-bio.PE)Noise-induced phenomenaSettore GEO/01 - Paleontologia E Paleoecologiabiology.organism_classificationlanguage.human_languageSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)OceanographyHeavy metalBenthic zoneFOS: Biological scienceslanguageEnvironmental scienceSeawaterSicilian

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Noise stabilization effects in models of interdisciplinary physics

2009

Metastability is a generic feature of many nonlinear systems, and the problem of the lifetime of metastable states involves fundamental aspects of nonequilibrium statistical mechanics. The investigation of noise-induced phenomena in far from equilibrium systems is one of the approaches used to understand the behaviour of physical and biological complex systems. The enhancement of the lifetime of metastable states through the noise enhanced stability effect and the role played by the resonant activation phenomenon will be discussed in models of interdisciplinary physics: (i) polymer translocation dynamics; (ii) transient regime of FitzHugh-Nagumo model; (iii) market stability in a nonlinear …

Josephson effectPhysicsmetastability in quantum systemsHistorystatistical mechanics complex systems noiseSettore FIS/02 - Fisica Teorica Modelli E Metodi MatematiciComplex systemStatistical mechanicsNoise (electronics)noise-induced phenomena; out-of-equilibrium phenomena; metastability in quantum systemsComputer Science ApplicationsEducationHeston modelNonlinear systemMetastabilityStatistical physicsout-of-equilibrium phenomenaQuantumnoise-induced phenomena

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The Spike Noise Based on the Renewal Point Process and Its Possible Applications

2010

We consider a non-Markovian random process in the form of spikes train, where the time intervals between neighboring delta-pulses are mutually independent and identically distributed, i.e. represent the renewal process (1967). This noise can be interpreted as the derivative of well-known continuous time random walk (CTRW) model process with fixed value of jumps. The closed set of equations for the characteristic functional of the noise, useful to split the correlations between stochastic functionals (2008), is obtained. In the particular case of Poisson statistics these equations can be exactly solved and the expression for the characteristic functional coincides with the result for shot no…

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