Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Test on Edwards Volume Ensemble of Tapped Granular Packings   Using X-ray tomography, we experimentally investigate granular packings
subject to mechanical tapping for three types of beads with different friction
coefficients. We validate Edwards volume ensemble in these three-dimensional
granular systems and establish a granular version of thermodynamic zeroth law.
Within Edwards framework, we also explicitly clarify how friction influences
granular statistical mechanics as modifying the density of states, which allows
us to determine the entropy as a function of packing fraction and friction
subsequently. Additionally, we obtain a granular jamming phase diagram based on
geometric coordination number and packing fraction.

31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg