Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First principles study of helium, carbon and nitrogen in austenite,
  dilute austenitic iron alloys and nickel   An extensive set of first-principles density functional theory calculations
have been performed to study the behaviour of He, C and N solutes in austenite,
dilute Fe-Cr-Ni austenitic alloys and Ni in order to investigate their
influence on the microstructural evolution of austenitic steel alloys under
irradiation.

37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol