baldassarri baronchelli barrat caglioti castellano cattuto complexity dattoli evolutionary_dynamics granular_media granular_media herrmann information_theory innovation_dynamics kreyon language_dynamics loreto mari mukherjee petri pietronero puglisi quantum_optics self_organization servedio statistical_physics techno_social_systems tria zapperi zippers
2011 |
Balzan, Riccardo; Dalton, Fergal; Loreto, Vittorio; Petri, Alberto; Pontuale, Giorgio Brownian motor in a granular medium Journal Article PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 83 , 2011. Abstract | Links | BibTeX | Tag: balzan, dalton, granular_media, loreto, petri @article{b, title = {Brownian motor in a granular medium}, author = {Riccardo Balzan and Fergal Dalton and Vittorio Loreto and Alberto Petri and Giorgio Pontuale}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79961110600&partnerID=65&md5=02ae65b9fd908a65c1cf7a31749a58c0 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000288947100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {2011}, date = {2011-01-01}, journal = {PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS}, volume = {83}, publisher = {pubblicata da: AMERICAN PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, USA, MD, 20740-3844}, abstract = {In this work we experimentally study the behavior of a freely rotating asymmetric probe immersed in a vibrated granular medium. For a wide variety of vibration conditions the probe exhibits a steady rotation whose direction is constant with respect to the asymmetry. By changing the vibration amplitude and by filtering the noise in different frequency bands we show that the velocity of rotation depends not only on the RMS acceleration Γ, but also on the amount of energy provided to two separate frequency bands, which are revealed to be important for the dynamics of the granular medium: The first band governs the transfer of energy from the grains to the probe, and the second affects the dynamics by altering the viscosity of the vibro-fluidized material. © 2011 American Physical Society.}, keywords = {balzan, dalton, granular_media, loreto, petri}, pubstate = {published}, tppubtype = {article} } In this work we experimentally study the behavior of a freely rotating asymmetric probe immersed in a vibrated granular medium. For a wide variety of vibration conditions the probe exhibits a steady rotation whose direction is constant with respect to the asymmetry. By changing the vibration amplitude and by filtering the noise in different frequency bands we show that the velocity of rotation depends not only on the RMS acceleration Γ, but also on the amount of energy provided to two separate frequency bands, which are revealed to be important for the dynamics of the granular medium: The first band governs the transfer of energy from the grains to the probe, and the second affects the dynamics by altering the viscosity of the vibro-fluidized material. © 2011 American Physical Society. |
2000 |
Barrat, Alain; Loreto, Vittorio Response properties in a model for granular matter Journal Article JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL, 33 , pp. 4401–4426, 2000. Links | BibTeX | Tag: barrat, granular_media, loreto @article{b, title = {Response properties in a model for granular matter}, author = {Alain Barrat and Vittorio Loreto}, url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0034705247&partnerID=65&md5=82ed3ead2890ef9da53fc8533cf614c1, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000088364500002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {2000}, date = {2000-01-01}, journal = {JOURNAL OF PHYSICS. A, MATHEMATICAL AND GENERAL}, volume = {33}, pages = {4401--4426}, keywords = {barrat, granular_media, loreto}, pubstate = {published}, tppubtype = {article} } |
1999 |
Puglisi, Andrea; Loreto, Vittorio; Bettolo, Umberto Marini; Vulpiani, Angelo A kinetic approach to granular gases Journal Article PHYSICAL REVIEW E, 59 , pp. 5582–5582, 1999. Links | BibTeX | Tag: granular_media, loreto, marini bettolo, puglisi, vulpiani @article{b, title = {A kinetic approach to granular gases}, author = {Andrea Puglisi and Vittorio Loreto and Umberto Marini Bettolo and Angelo Vulpiani}, url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000080382900021&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {PHYSICAL REVIEW E}, volume = {59}, pages = {5582--5582}, publisher = {American Institute of Physics}, keywords = {granular_media, loreto, marini bettolo, puglisi, vulpiani}, pubstate = {published}, tppubtype = {article} } |
Caglioti, Emanuele; Coniglio, Antonio; Hermann, Hans J; Loreto, Vittorio Cooperative lenght approach for granular media Journal Article PHYSICA. A, 265 , pp. 311–318, 1999. Abstract | Links | BibTeX | Tag: caglioti, coniglio, granular_media, herrmann, loreto @article{b, title = {Cooperative lenght approach for granular media}, author = {Emanuele Caglioti and Antonio Coniglio and Hans J. Hermann and Vittorio Loreto}, url = {http://www.sciencedirect.com/science/article/pii/S0378437198006608, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000079060800023&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {PHYSICA. A}, volume = {265}, pages = {311--318}, publisher = {Elsevier B.V.}, abstract = {We analyze the non-equilibrium relaxation properties of granular materials in the perspective of a cooperative length approach of Adam and Gibbs. The existence of complex geometrical interactions between the grains induces a rough landscape in the structure of the allowable phase space and in the configurational entropy. At their turn these effects induce the need of complex cooperative rearrangements which account for the very slow relaxation dynamics of these systems. On this basis we relate quantitatively the characteristic dynamical properties to quasistatic quantities, e.g. free-volume and configurational entropy.}, keywords = {caglioti, coniglio, granular_media, herrmann, loreto}, pubstate = {published}, tppubtype = {article} } We analyze the non-equilibrium relaxation properties of granular materials in the perspective of a cooperative length approach of Adam and Gibbs. The existence of complex geometrical interactions between the grains induces a rough landscape in the structure of the allowable phase space and in the configurational entropy. At their turn these effects induce the need of complex cooperative rearrangements which account for the very slow relaxation dynamics of these systems. On this basis we relate quantitatively the characteristic dynamical properties to quasistatic quantities, e.g. free-volume and configurational entropy. |
Caglioti, Emauele; Loreto, Vittorio Entropy for relaxation dynamics in granular media Journal Article PHYSICAL REVIEW LETTERS, 83 , pp. 4333–4336, 1999. Abstract | Links | BibTeX | Tag: caglioti, granular_media, loreto @article{b, title = {Entropy for relaxation dynamics in granular media}, author = {Emauele Caglioti and Vittorio Loreto}, url = {http://prl.aps.org/abstract/PRL/v83/i21/p4333_1, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000083745600028&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {PHYSICAL REVIEW LETTERS}, volume = {83}, pages = {4333--4336}, abstract = {We investigate the role of entropic concepts for the relaxation dynamics in granular systems. In these systems the existence of a geometrical frustration induces a drastic modification of the allowed phase space, which in its turn induces a dynamic behavior characterized by hierarchical relaxation phenomena with several time scales associated. In particular we show how, in the framework of a mean-field model introduced for the compaction phenomenon, there exists a free-energy-like functional which decreases along the trajectories of the dynamics and which allows to account for the asymptotic behavior: e.g. density profile, segregation phenomena. Also we are able to perform the continuous limit of the above mentioned model which turns out to be a diffusive limit. In this framework one can single out two separate physical ingredients: the free-energy-like functional that defines the phase-space and the asymptotic states and a diffusion coefficient $D(rho)$ accounting for the velocity of approach to the asymptotic stationary states.}, keywords = {caglioti, granular_media, loreto}, pubstate = {published}, tppubtype = {article} } We investigate the role of entropic concepts for the relaxation dynamics in granular systems. In these systems the existence of a geometrical frustration induces a drastic modification of the allowed phase space, which in its turn induces a dynamic behavior characterized by hierarchical relaxation phenomena with several time scales associated. In particular we show how, in the framework of a mean-field model introduced for the compaction phenomenon, there exists a free-energy-like functional which decreases along the trajectories of the dynamics and which allows to account for the asymptotic behavior: e.g. density profile, segregation phenomena. Also we are able to perform the continuous limit of the above mentioned model which turns out to be a diffusive limit. In this framework one can single out two separate physical ingredients: the free-energy-like functional that defines the phase-space and the asymptotic states and a diffusion coefficient $D(rho)$ accounting for the velocity of approach to the asymptotic stationary states. |
Khrishnamurthy, Supriya; Loreto, Vittorio; Hermmann, Hans J; Nicodemi, Mario; Roux, Stephane Internal avalanches in models of granular media Journal Article FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY, 7 , pp. 51–58, 1999. Abstract | Links | BibTeX | Tag: granular_media, herrmann, khrishnamurthy, loreto, nicodemi, roux @article{b, title = {Internal avalanches in models of granular media}, author = {Supriya Khrishnamurthy and Vittorio Loreto and Hans J. Hermmann and Mario Nicodemi and Stephane Roux}, url = {http://www.worldscinet.com/fractals/07/0701/S0218348X99000074.html, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000081441600006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY}, volume = {7}, pages = {51--58}, abstract = {We study the phenomenon of internal avalanching within the context of recently introduced lattice models of granular media. The avalanche is produced by pulling out a grain at the base of the packing and then studying the number of grains to be rearranged before the packing is stable again. We find that the avalanches are long-ranged, decaying as a power law. We study the distribution of avalanches as a function of the density of the packing and find that the avalanche distribution is a very sensitive structural probe of the system.}, keywords = {granular_media, herrmann, khrishnamurthy, loreto, nicodemi, roux}, pubstate = {published}, tppubtype = {article} } We study the phenomenon of internal avalanching within the context of recently introduced lattice models of granular media. The avalanche is produced by pulling out a grain at the base of the packing and then studying the number of grains to be rearranged before the packing is stable again. We find that the avalanches are long-ranged, decaying as a power law. We study the distribution of avalanches as a function of the density of the packing and find that the avalanche distribution is a very sensitive structural probe of the system. |
Khirshnamurthy, Supriya; Loreto, Vittorio; Hermann, Hans J; Manna, Subhrangshu S; Roux, Stephane Self-structuring of granular media under internal avalanching Journal Article PHYSICAL REVIEW LETTERS, 83 , pp. 304–307, 1999. Abstract | Links | BibTeX | Tag: granular_media, herrmann, khrishnamurthy, loreto, manna, roux @article{b, title = {Self-structuring of granular media under internal avalanching}, author = {Supriya Khirshnamurthy and Vittorio Loreto and Hans J. Hermann and Subhrangshu S. Manna and Stephane Roux}, url = {http://prl.aps.org/abstract/PRL/v83/i2/p304_1, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000081358900016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {PHYSICAL REVIEW LETTERS}, volume = {83}, pages = {304--307}, publisher = {American Physical Soc., One Physics Ellipse, College PK, MD 20740-3844 USA}, abstract = {We study the phenomenon of internal avalanching within the context of recently proposed "Tetris" lattice models for granular media. We define a recycling dynamics under which the system reaches a steady state which is self-structured, i.e., it shows a complex interplay between textured internal structures and critical avalanche behavior. Furthermore, we develop a general mean-field theory for this class of systems and discuss possible scenarios for the breakdown of universality.}, keywords = {granular_media, herrmann, khrishnamurthy, loreto, manna, roux}, pubstate = {published}, tppubtype = {article} } We study the phenomenon of internal avalanching within the context of recently proposed "Tetris" lattice models for granular media. We define a recycling dynamics under which the system reaches a steady state which is self-structured, i.e., it shows a complex interplay between textured internal structures and critical avalanche behavior. Furthermore, we develop a general mean-field theory for this class of systems and discuss possible scenarios for the breakdown of universality. |
Hascoet, Erwan; Herrmann, Hand J; Loreto, Vittorio Shock propagation in a granular chain Journal Article PHYSICAL REVIEW E, 59 , pp. 3202–3206, 1999. Abstract | Links | BibTeX | Tag: granular_media, hascoet, herrmann, loreto @article{b, title = {Shock propagation in a granular chain}, author = {Erwan Hascoet and Hand J. Herrmann and Vittorio Loreto}, url = {http://pre.aps.org/abstract/PRE/v59/i3/p3202_1, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000079233500019&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1999}, date = {1999-01-01}, journal = {PHYSICAL REVIEW E}, volume = {59}, pages = {3202--3206}, publisher = {AMERICAN PHYSICAL SOC.}, abstract = {We numerically solve the propagation of a shock wave in a chain of elastic beads with no restoring forces under traction (no-tension elasticity). We find a sequence of peaks of decreasing amplitude and velocity. Analyzing the main peak at different times we confirm a recently proposed scaling law for its decay.}, keywords = {granular_media, hascoet, herrmann, loreto}, pubstate = {published}, tppubtype = {article} } We numerically solve the propagation of a shock wave in a chain of elastic beads with no restoring forces under traction (no-tension elasticity). We find a sequence of peaks of decreasing amplitude and velocity. Analyzing the main peak at different times we confirm a recently proposed scaling law for its decay. |
1998 |
Puglisi, Andrea; Loreto, Vittorio; Bettolo, Umberto Marini; Petri, Alberto; Vulpiani, Angelo Clustering and non-gaussian behavior in granular matter Journal Article PHYSICAL REVIEW LETTERS, 81 , pp. 3848–3848, 1998. BibTeX | Tag: granular_media, loreto, marini bettolo, petri, puglisi, vulpiani @article{b, title = {Clustering and non-gaussian behavior in granular matter}, author = {Andrea Puglisi and Vittorio Loreto and Umberto Marini Bettolo and Alberto Petri and Angelo Vulpiani}, year = {1998}, date = {1998-01-01}, journal = {PHYSICAL REVIEW LETTERS}, volume = {81}, pages = {3848--3848}, keywords = {granular_media, loreto, marini bettolo, petri, puglisi, vulpiani}, pubstate = {published}, tppubtype = {article} } |
Caglioti, Emanuele; Coniglio, Antonio; Herrmann, Hans J; Loreto, Vittorio; Nicodemi, Mario Segregation of granular mixtures in presence of compaction Journal Article EUROPHYSICS LETTERS, 43 , pp. 591–597, 1998. Abstract | Links | BibTeX | Tag: caglioti, coniglio, granular_media, herrmann, loreto, nicodemi, tetris @article{b, title = {Segregation of granular mixtures in presence of compaction}, author = {Emanuele Caglioti and Antonio Coniglio and Hans J. Herrmann and Vittorio Loreto and Mario Nicodemi}, url = {http://iopscience.iop.org/0295-5075/43/5/591/, http://www.scopus.com/inward/record.url?eid=2-s2.0-0032164694&partnerID=65&md5=c108ca4627474930d839d71d325afc8b, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=000075612400017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1998}, date = {1998-01-01}, journal = {EUROPHYSICS LETTERS}, volume = {43}, pages = {591--597}, abstract = {We study the segregation phenomena in granular media in the framework of Tetris-like models for granular compaction. The models, which focus on the geometrical properties of mixtures, exhibit segregation, i.e. separation of particles with different degrees of geometrical frustration. This effect is related to the effective average mobilities of the different particles. Mie study these effects in the context of an analytical mean-field-like model.}, keywords = {caglioti, coniglio, granular_media, herrmann, loreto, nicodemi, tetris}, pubstate = {published}, tppubtype = {article} } We study the segregation phenomena in granular media in the framework of Tetris-like models for granular compaction. The models, which focus on the geometrical properties of mixtures, exhibit segregation, i.e. separation of particles with different degrees of geometrical frustration. This effect is related to the effective average mobilities of the different particles. Mie study these effects in the context of an analytical mean-field-like model. |
1997 |
Caglioti, Emanuele; Loreto, Vittorio; Herrmann, Hans J; Nicodemi, Mario A "tetris-like" model for the compaction of dry granular media Journal Article PHYSICAL REVIEW LETTERS, 79 , pp. 1575–1578, 1997. Abstract | Links | BibTeX | Tag: caglioti, granular_media, herrmann, loreto, nicodemi, tetris @article{b, title = {A "tetris-like" model for the compaction of dry granular media}, author = {Emanuele Caglioti and Vittorio Loreto and Hans J. Herrmann and Mario Nicodemi}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.79.1575, http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=A1997XT12400038&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a}, year = {1997}, date = {1997-01-01}, journal = {PHYSICAL REVIEW LETTERS}, volume = {79}, pages = {1575--1578}, abstract = {We propose a two-dimensional geometrical model, based on the concept of geometrical frustration, conceived for the study of compaction in granular media. The dynamics exhibits an interesting inverse logarithmic law that is well known from real experiments. Moreover, we present a simple dynamical model of N planes exchanging particles with excluded volume problems, which allows us to clarify the origin of the logarithmic relaxations and the stationary density distribution. A simple mapping allows us to cast this Tetris-like model in the form of an Ising-like spin system with vacancies.}, keywords = {caglioti, granular_media, herrmann, loreto, nicodemi, tetris}, pubstate = {published}, tppubtype = {article} } We propose a two-dimensional geometrical model, based on the concept of geometrical frustration, conceived for the study of compaction in granular media. The dynamics exhibits an interesting inverse logarithmic law that is well known from real experiments. Moreover, we present a simple dynamical model of N planes exchanging particles with excluded volume problems, which allows us to clarify the origin of the logarithmic relaxations and the stationary density distribution. A simple mapping allows us to cast this Tetris-like model in the form of an Ising-like spin system with vacancies. |
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