K 79 Koverda, V. P. Fluctuations with a 1/fα spectrum in nonequilibrium phase transitions in a spatially distributed system [Электронный ресурс] / V. P. Koverda, V. N. Skokov // Technical Physics. - 2010. - Vol.55, №4. - P442-448 Рубрики: ФИЗИКА Кл.слова (ненормированные): NONEQUILIBRIUM PHASE -- FLUCTUATIONS -- NOISE Аннотация: Statistics of fluctuations in a spatially distributed system describing the interaction of nonequilibrium phase transitions is studied. It is shown that for a certain value of the intensity of external white noise acting on phase transitions, the time and spatial spectra of fluctuations exhibit power dependences S(f) ~ f-α and S(k) ~ k-γ. The dependence of exponents α and γ on the diffusion coefficient determining the spatial interaction of fluctuations is determined. Extremal low-frequency fluctuations are singled out and the distribution functions of their duration (P(τ) ~ τ-β) and size (P(s) ~ s-ν)) are constructed. It is found that exponent α in the time spectral dependence and exponent β in the duration of fluctuations are connected via the relation α + β = 2. Exponents γ and ν in the spatial spectral dependence and in the size distribution function are connected via an analogous relation (γ + ν = 2). |