Stationary state volume fluctuations in a granular medium.

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A statistical description of static granular material requires ergodic sampling of the phase space spanned by the different configurations of the particles. We periodically fluidize a column of glass beads and find that the sequence of volume fractions phi of postfluidized states is history independent and Gaussian distributed about a stationary state. The standard deviation of phi exhibits, as a function of phi, a minimum corresponding to a maximum in the number of statistically independent regions. Measurements of the fluctuations enable us to determine the compactivity X , a temperaturelike state variable introduced in the statistical theory of Edwards and Oakeshott [Physica A 157, 1080 (1989)].





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Schröter, Matthias, Daniel I Goldman and Harry L Swinney (2005). Stationary state volume fluctuations in a granular medium. Physical review. E, Statistical, nonlinear, and soft matter physics, 71(3 Pt 1). p. 030301. 10.1103/physreve.71.030301 Retrieved from

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Matthias Schroter

Visiting Associate Professor of DKU Studies at Duke University

I am interested in (in order of appearance): Greek philosophy, pattern formation, minimal music, granular matter, meditation, X-ray tomography, machine learning,  ....

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