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- M Abel, A Celani, D Vergni, A Vulpiani
- Physical review. E, Statistical, nonlinear, and…
- 2001

The problem of front propagation in flowing media is addressed for laminar velocity fields in two dimensions. Three representative cases are discussed: stationary cellular flow, stationary shear flow, and percolating flow. Production terms of Fisher-Kolmogorov-Petrovskii-Piskunov type and of Arrhenius type are considered under the assumption of no feedback… (More)

- Davide Vergni, Filippo Castiglione, +7 authors Fabio Cavaliere
- PloS one
- 2009

We have developed a rat brain organotypic culture model, in which tissue slices contain cortex-subventricular zone-striatum regions, to model neuroblast activity in response to in vitro ischemia. Neuroblast activation has been described in terms of two main parameters, proliferation and migration from the subventricular zone into the injured cortex. We… (More)

- L Biferale, M Cencini, D Vergni, A Vulpiani
- Physical review. E, Statistical physics, plasmas…
- 1999

The exit-time statistics of experimental turbulent data is analyzed. By looking at the exit-time moments (inverse structure functions) it is possible to have a direct measurement of scaling properties of the laminar statistics. It turns out that the inverse structure functions show a much more extended intermediate dissipative range than the structure… (More)

- Giovanni Iacovoni, Valerio Manca, Davide Vergni
- GLOBECOM
- 2000

As far as we know, three non-mutually exclusive reasons have been given to account for the complex scaling behaviour observed in IP traac on small time scales, namely: data fragmentation due to protocol layering; complex interactions in the network between traac ows and data and storage elements; the TCP mechanism. Focusing on the TCP mechanism, we… (More)

- S Berti, C López, D Vergni, A Vulpiani
- Physical review. E, Statistical, nonlinear, and…
- 2007

An autocatalytic reacting system with particles interacting at a finite distance is studied. We investigate the effects of the discrete-particle character of the model on properties like reaction rate, quenching phenomenon, and front propagation, focusing on differences with respect to the continuous case. We introduce a renormalized reaction rate depending… (More)

- M Abel, L Biferale, M Cencini, M Falcioni, D Vergni, A Vulpiani
- 2000

We present a comprehensive investigation of ǫ-entropy, h(ǫ), in dynamical systems, stochastic processes and turbulence. Particular emphasis is devoted on a recently proposed approach to the calculation of the ǫ-entropy based on the exit-time statistics. The advantages of this method are demonstrated in examples of deterministic diffusive maps, intermittent… (More)

- Roberto Baviera, Davide Vergni, Angelo Vulpiani
- 1999

In this paper we test the random walk hypothesis on the high frequency dataset of the bid–ask Deutschemark/US dollar exchange rate quotes registered by the inter-Then we propose a stochastic model for price variation which is able to describe some important features of the exchange market behavior. Besides the usual correlation analysis we have verified the… (More)

An efficient approach to the calculation of the e-entropy is proposed. The method is based on the idea of looking at the information content of a string of data, by analyzing the signal only at the instants when the fluctuations are larger than a certain threshold e, i.e., by looking at the exit-time statistics. The practical and theoretical advantages of… (More)

We present a numerical study of two-dimensional turbulent flows in the enstropy cascade regime, with different large-scale energy sinks. In particular, we study the statistics of more-than-differentiable velocity fluctuations by means of two sets of statistical estimators, namely inverse statistics and second-order differences. In this way, we are able to… (More)

- L Biferale, M Cencini, A Lanotte, D Vergni, A Vulpiani
- Physical review letters
- 2001

The problem of inverse statistics (statistics of distances for which the signal fluctuations are larger than a certain threshold) in differentiable signals with power law spectrum, E(k) approximately k(-alpha), 3< or =alpha<5, is discussed. We show that for these signals, with random phases, exit-distance moments follow a bifractal distribution. We also… (More)