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Title:Avalanches in disordered systems
Author(s):Friedman, Nir
Director of Research:Dahmen, Karin A.
Doctoral Committee Chair(s):Oono, Yoshitsugu
Doctoral Committee Member(s):Dahmen, Karin A.; Selvin, Paul R.; Weissman, Michael B.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
non equilibrium
random field Ising model
correlated disorder
Abstract:The idea of systems that evolve via avalanches is a simple, yet powerful one. A collection of elements that interact with one another, with each element possessing the ability to change the state of other elements when it undergoes a change. These other newly changed elements may affect yet more, and in this way a single initial event can trigger a cascade of activity. I apply the ideas of non-equilibrium, avalanching models with quenched disorder to three different sys- tems. The first system is the neuronal network in in vitro rat cortex; neurons generate electrical impulses that travel along axons and dendrites to potentiall influence the behavior of other neurons. The second sys- tem is the deformation characteristics of nanoscale metallic pillars; increasing stress dislodges dislocations which interact elastically with other dislocations. The third system the random field Ising model, with the twist of introducing long range correlations in the quenched disorder. The differing nature of the systems emphasizes the very strong utility of these models, that are very simple, yet enable powerful statistical predictions about a wide range of systems.
Issue Date:2013-08-22
Rights Information:Copyright 2013 Nir Friedman. All rights reserved.
Date Available in IDEALS:2013-08-22
Date Deposited:2013-08

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