Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective medium theory for the thermoelectric properties of composite
  materials with various percolation thresholds   In the work, a modified effective medium theory is constructed for
calculating the effective properties of thermoelectric composites with
different values of percolation thresholds. It is shown that even at
concentrations beyond the critical region, the threshold value is essential for
determining the effective properties. Two fundamentally different cases of a
set of local properties of the composite are considered. In one of these cases,
the conductivity and thermal conductivity of one of the phases is
simultaneously greater than the conductivity and thermal conductivity of the
other phase. The second, anomalous case, when the electrical conductivity of
the first phase is greater than that of the second, but the thermal
conductivity of the first phase is less than that of the second, shows unusual
concentration behavior of effective conductivity, i.e. with an increase in the
well-conducting phase, the effective conductivity shows a decrease (rather than
growth as in the standard case), which at goes over to growth.

18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
19
The categories of this paper are: eess