Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Dynamics of Non-Crystalline Silica: Insight from Molecular Dynamics
  Computer Simulations   Using a large scale molecular dynamics computer simulation we investigate the
dynamics of a supercooled melt of SiO_2. We find that with increasing
temperature the temperature dependence of the diffusion constants crosses over
from an Arrhenius-law, with activation energies close to the experimental
values, to a power-law dependence. We show that this crossover is related to
the fact that at low temperatures the dynamics of the ions is dominated by
hopping processes, whereas at high temperatures it shows the continuous
flow-like motion proposed by the ideal version of mode-coupling theory (MCT).
Finally we show that at low temperatures the dynamics of the system in the
beta-relaxation regime obeys the factorization property, in agreement with MCT.

12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex