BibSonomy publications for /user/andreab/2003Tue Oct 17 19:21:34 CEST 2006Physical Review Letters6060601Average Shape of a Fluctuation: Universality in Excursions of Stochastic Processes902003prl randomwalk randomprocesses 2003 barkhausen averageshape fluctuations cnrbest5 myown We study the average shape of a fluctuation of a time series x(t), which is the average value <x(t)–x(0)>T before x(t) first returns at time T to its initial value x(0). For large classes of stochastic processes, we find that a scaling law of the form <x(t)–x(0)>T = Talphaf(t/T) is obeyed. The scaling function f(s) is, to a large extent, independent of the details of the single increment distribution, while it encodes relevant statistical information on the presence and nature of temporal correlations in the process. We discuss the relevance of these results for Barkhausen noise in magnetic systems.Tue Oct 17 19:12:29 CEST 2006Granular Gas DynamicsLecture Notes in PhysicsVelocity fluctuations in cooling granular gases.6242003myown gases granular procedings 2003