Paul V Quinn

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In the Brazil nut problem (BNP), hard spheres with larger diameters rise to the top. There are various explanations (percolation, reorganization, convection), but a broad understanding or control of this effect is by no means achieved. A theory is presented for the crossover from BNP to the reverse Brazil nut problem based on a competition between the(More)
Molecular Dynamics simulations were carried out to test the thermodynamic theory of weakly excited, two-dimensional, granular systems [Hayakawa and Hong, Phys. Rev. Lett. 78, 2764(1997)], where granular materials are viewed as a collection of spinless Fermions. We first determine the global temperature T by fitting the steady state density profile to the(More)
Molecular Dynamics simulations were carried out to test the ther-modynamic theory of weakly excited, two-dimensional, granular sys-granular materials are viewed as a collection of spinless Fermions. We rst determine the global temperature T by tting the steady state density proole to the Fermi distribution function, and then measure the center of mass, <(More)
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