Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical behavior in porous media flow   The intermittent burst dynamics during the slow drainage of a porous medium
is studied experimentally. We have shown that this system satisfies a set of
conditions known to be true for critical systems, such as intermittent activity
with bursts extending over several time and length scales, self-similar
macroscopic fractal structure and $1/f^\alpha$ power spectrum. Additionally, we
have verified a theoretically predicted scaling for the burst size
distribution, previously assessed via numerical simulations. The observation of
$1/f^\alpha$ power spectra is new for porous media flows and, for specific
boundary conditions, we notice the occurrence of a transition from $1/f$ to
$1/f^2$ scaling. An analytically integrable mathematical framework was employed
to explain this behavior.

36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol