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Fractional Diffusion and Medium Heterogeneity: The Case of the Continuos Time Random Walk 

Sposini, V.; Vitali, S.Autoridad BCAM; Paradisi, P.Autoridad BCAM; Pagnini, G.Autoridad BCAM (2021-07-24)
In this contribution we show that fractional diffusion emerges from a simple Markovian Gaussian random walk when the medium displays a power-law heterogeneity. Within the framework of the continuous time random walk, the ...
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Study of Wound Healing Dynamics by Single Pseudo-Particle Tracking in Phase Contrast Images Acquired in Time-Lapse 

Scheda, R.; Vitali, S.Autoridad BCAM; Giampieri, E.; Pagnini, G.Autoridad BCAM; Zironi, I. (2021-03)
Cellular contacts modify the way cells migrate in a cohesive group with respect to a free single cell. The resulting motion is persistent and correlated, with cells’ velocities self-aligning in time. The presence of a dense ...
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SHOULD I STAY OR SHOULD I GO? ZERO-SIZE JUMPS IN RANDOM WALKS FOR LÉVY FLIGHTS 

Pagnini, G.Autoridad BCAM; Vitali, S.Autoridad BCAM (2021-02)
We study Markovian continuous-time random walk models for Lévy flights and we show an example in which the convergence to stable densities is not guaranteed when jumps follow a bi-modal power-law distribution that is equal ...
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A generalized Stefan model accounting for system memory and non-locality 

Garra, R.; Falcini, F.; Voller, V.R.; Pagnini, G.Autoridad BCAM (2020-05)
The Stefan problem, involving the tracking of an evolving phase-change front, is the prototypical example of a moving boundary problem. In basic one- dimensional problems it is well known that the front advances as the ...
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Gaussian processes in complex media: new vistas on anomalous diffusion 

Di Tullio, F.; Paradisi, P.Autoridad BCAM; Spigler, R.; Pagnini, G.Autoridad BCAM (2019-09)
Normal or Brownian diffusion is historically identified by the linear growth in time of the variance and by a Gaussian shape of the displacement distribution. Processes departing from the at least one of the above conditions ...
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Fire-spotting generated fires. Part I: The role of atmospheric stability 

Egorova, V.; Trucchia, A.; Pagnini, G.Autoridad BCAM (2019-02)
This is the first part of two papers concerning fire-spotting generated fires. In this part we deal with the impact of macroscale factors, such as the atmospheric stability, and in the second part we deal with mesoscale ...
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Finite-energy Lévy-type motion through heterogeneous ensemble of Brownian particles 

Sliusarenko, O.Autoridad BCAM; Vitali, S.Autoridad BCAM; Sposini, V.; Paradisi, P.Autoridad BCAM; Chechkin, A.V.; Castellani, G.; Pagnini, G.Autoridad BCAM (2019-02-01)
Complex systems are known to display anomalous diffusion, whose signature is a space/time scaling $x \sim t^\delta$ with $\delta \neq 1/2$ in the probability density function (PDF). Anomalous diffusion can emerge jointly ...
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Fractional Brownian motion in a finite interval: correlations effect depletion or accretion zones of particles near boundaries 

Guggenberger, T.; Pagnini, G.Autoridad BCAM; Vojta, T.; Metzler, R. (2019-02)
Fractional Brownian motion (FBM) is a Gaussian stochastic process with stationary, long-time correlated increments and is frequently used to model anomalous diffusion processes. We study numerically FBM confined to a finite ...
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On the merits of sparse surrogates for global sensitivity analysis of multi-scale nonlinear problems: Application to turbulence and fire-spotting model in wildland fire simulators 

Trucchia, A.; Egorova, V.; Pagnini, G.Autoridad BCAM; Rochoux, M.C. (2019-02)
Many nonlinear phenomena, whose numerical simulation is not straightforward, depend on a set of parameters in a way which is not easy to predict beforehand. Wildland fires in presence of strong winds fall into this category, ...
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Restoring property of the Michelson-Sivashinsky equation 

Trucchia, A.; Pagnini, G.Autoridad BCAM (2019)
In this paper we propose a derivation of the Michelson-Sivashinsky (MS) equation that is based on front propagation only, in opposition to the classical derivation based also on the flow field. Hence, the characteristics ...
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Pagnini, G. (37)
Trucchia, A. (12)Egorova, V. (7)Paradisi, P. (6)Vitali, S. (6)Mentrelli, A. (5)Sposini, V. (5)Castellani, G. (3)Chechkin, A.V. (3)Kaur, I. (3)... másSubjectanomalous diffusion (9)fractional diffusion (6)Fire spotting (4)Wildfire propagation (3)biological transport (2)fractional brownian motion (2)Gaussian Process (2)generalized grey Brownian motion (2)M-Wright function (2)Sensitivity Analysis (2)... másFecha2021 (3)2020 (1)2019 (7)2018 (10)2017 (6)2016 (3)2014 (5)2013 (2)

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