Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coarsening of Precipitation Patterns in a Moving Reaction-Diffusion
  Front   Precipitation patterns emerging in a 2D moving front are investigated on the
example of NaOH diffusing into a gel containing AlCl_3. The time evolution of
the precipitate Al(OH)_3 can be observed since the precipitate redissolves in
the excess outer electrolyte NaOH and thus it exists only in a narrow,
optically accessible region of the reaction front. The patterns display
self-similar coarsening with a characteristic length, xi(t), increasing with
time t as xi(t) ~ t^(1/2). A theory based on Cahn-Hilliard phase-separation
dynamics including dissolution is shown to yield agreement with the
experiments.

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The categories of this paper are: hep-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs