Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Models of fluidized granular materials: examples of non-equilibrium
  stationary states   We review some models of granular materials fluidized by means of external
forces such as: random homogeneous forcing with damping, vibrating plates, flow
in an inclined channel and flow in a double well potential. All these systems
show the presence of density correlations and non-Gaussian velocity
distributions. These models are useful to understand the role of a kinetically
defined ``temperature'' (in this case the so-called {\em granular temperature})
in a non-equilibrium stationary state. In the homogeneously randomly driven gas
the granular temperature is {\em different} from that of the driving bath.
Moreover two different granular materials mixed together may stay in a
stationary state with different temperatures. At the same time, granular
temperature determines (as in equilibrium systems) the escape time from a well
in a double well potential.

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The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an