Abstract
We have found experimentally the existence of random density fluctuations, during the discharge of monodisperse granular material from flat bins, which follows a 1 f α noise, where α ⋍ 1.32 just above, and α ⋍ 1.0 just below the exit of the bin. The corresponding rescaled range analysis for the fractal noise obtained just above the exit gives a Hurst parameter H ⋍ 0.16, and a fractal dimension D ⋍ 1.84.
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