Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic structure and thermodynamics of a core-softened model fluid
  from the second-order integral equations theory   We have studied the structure and thermodynamic properties of isotropic
three-dimensional core-softened fluid by using the second-order
Ornstein-Zernike integral equations completed by the hypernetted chain and
Percus-Yevick closures. The radial distribution functions are compared with
those from singlet integral equations and with computer simulation data. The
limits of the region of density anomaly resulting from different approximate
theories are established. The obtained results show that the second-order
hypernetted chain approximation can be used to describe both the structure and
the density anomaly of this model fluid. Moreover, we present the results of
calculations of the bridge functions.

2
The categories of this paper are: math
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom