Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-principles calculations of shocked fluid helium in partially
  ionized region   Quantum molecular dynamic simulations have been employed to study the
equation of state (EOS) of fluid helium under shock compressions. The principal
Hugoniot is determined from EOS, where corrections from atomic ionization are
added onto the calculated data. Our simulation results indicate that principal
Hugoniot shows good agreement with gas gun and laser driven experiments, and
maximum compression ratio of 5.16 is reached at 106 GPa.

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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th