Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of defects in the onset of wall-induced granular convection   We investigate the onset of the wall-induced convection in vertically
vibrated granular matter by means of experiments and two-dimensional computer
simulations. In both simulations and experiments we find that the wall-induced
convection occurs inside the bouncing bed region of the parameter space in
which the granular bed behaves like a bouncing ball. A good agreement between
experiments and simulations is found for the peak vibration acceleration at
which convection starts. By comparing the results of simulations initialised
with and without defects, we find that the onset of convection occurs at lower
vibration strengths in the presence of defects. Furthermore, we find that the
convection of granular particles initialised in a perfect hexagonal lattice is
related to the nucleation of defects and the process is described by an
Arrhenius law.

30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph