Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vibration-induced "thermally activated" jamming transition in granular
  media   The quasi-static frequency response of a granular medium is measured by a
forced torsion oscillator method, with forcing frequency $f_{p}$ in the range
$10^{-4}$ Hz to 5 Hz, while weak vibrations at high-frequency $f_{s}$, in the
range 50 Hz to 200 Hz, are generated by an external shaker. The intensity of
vibration, $\Gamma $, is below the fluidization limit. A loss factor peak is
observed in the oscillator response as a function of $\Gamma $ or $f_{p}$. In a
plot of $\ln f_{p}$ against $1/\Gamma $, the position of the peak follows an
Arrhenius-like behaviour over four orders of magnitude in $f_{p}$. The data can
be described as a stochastic hopping process involving a probability factor
$\exp(-\Gamma_{j}/\Gamma)$ with $\Gamma_{j}$ a $f_{s}$-dependent characteristic
vibration intensity. A $f_{s}$-independent description is given by
$\exp(-\tau_{j}/\tau)$, with $\tau_{j}$ an intrinsic characteristic time, and
$\tau =\Gamma ^{n}/2\pi f_{s}$, n=0.5-0.6, an empirical control parameter with
unit of time. $\tau$ is seen as the effective average time during which the
perturbed grains can undergo structural rearrangement. The loss factor peak
appears as a crossover in the dynamic behaviour of the vibrated granular
system, which, at the time-scale $ 1/f_{p}$, is solid-like at low $\Gamma$, and
the oscillator is jammed into the granular material, and is fluid-like at high
$\Gamma$, where the oscillator can slide viscously.

5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci