Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical Simulations of Pressure Induced $sp^2$-$sp^3$ Transitions in
  Defect Carbon Nanotubes   The combination of pressure and vacancy defects are investigated to find the
ideal conditions that would create meaningful $sp^3$ interlinking without
causing severe damage to the single-walled carbon nanotubes (SWCNTs). Naturally
occurring defects fail to induce interlinking. The introduction of vacancy type
defects reduces the collapse pressure of the SWCNTs. The combination of vacancy
defects, high temperature and low pressure induces $sp^3$ without causing
severe damage to the nanotubes. Structural changes caused before and after
pressurization of the nanotubes were analyzed using Raman spectroscopy.

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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
9
The categories of this paper are: nlin
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The categories of this paper are: chem-ph