Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling Nonequilibrium Phase Transitions and Critical Behavior in
  Complex Systems   We comment on some recent, yet unpublished results concerning instabilities
in complex systems and their applications. In particular, we briefly describe
main observations during extensive computer simulations of two lattice
nonequilibrium models. One exhibits robust and efficient processes of pattern
recognition under synaptic coherent activity; the second example exhibits
interesting critical behavior and simulates nucleation and spinodal
decomposition processes in driven fluids.

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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: atom-ph