65 research outputs found
How Many Vendors Does It Take to Screw Down a Price? A Primer on Competition in Procurement
Benefiting from a Clean Environment versus Undertaking Efforts to Protect the Environment
Extended acoustic waves in diluted random systems
In this paper we study the propagation of acoustic waves in an one-dimensional diluted random media which is composed of two interpenetrating chains with pure and random elasticity. We considered a discrete one-dimensional version of the wave equation where the elasticity distribution appears as an effective spring constant. By using a matrix recursive reformulation we compute the localization length within the band of allowed frequencies. In addition, we apply a second-order finite difference method for both time and spatial variables, and study the nature of the waves that propagate in the chain. We numerically demonstrate that the diluted random elasticity distribution promotes extended acoustic modes at high-frequencies. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011
Localization-delocalization transition in a presence of correlated disorder: The random dimer model
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