Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical Simulations of the MRI and Real Disks   Numerical MHD codes have become extraordinarily powerful tools with which to
study accretion turbulence. They have been used primarily to extract values for
the classical $\alpha$ parameter, and to follow complex evolutionary
development. Energy transport, which is at the heart of classical disk theory,
has yet to be explored in any detail. Further topics that should be explored by
simulation include nonideal MHD, radiation physics, and outburst behavior
related to the temperature sensitivity of the resistivity.

12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg