Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling of diffusion processes on physical and structural levels of
  materials   A possibility to use an integral operator for establishing the link between
physical and structural levels of materials in modeling diffusion processes is
considered. We show how to perform the transition from the stochastic
description of motion of a system of points to the continuum description of
diffusive profiles.

35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga