Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD and Nuclear Physics   The main part of this talk is a review and summary of how QCD is used in two
main areas of nuclear physics, namely in determining the quark flavor and spin
content of the proton and in ultrarelativistic heavy ion collisions. Brief
comments are made concerning effective theories in hadron physics and on the
separation of various twists in using the operator product expansion to analyze
hard processes.

34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs