Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillatory switching centrifugation: dynamics of a particle in a
  pulsating vortex   The dynamics of a small rigid spherical particle in an unbounded pulsating
vortex is considered, keeping constant the particle Stokes number St and
varying the particle-to-fluid density ratio $\varrho$ and the pulsation
frequency of the vortex $\omega$. We show that the asymptotic dynamics of a
particle of given St and $\varrho$ can be controlled by varying $\omega$,
turning the vortex core either into an attractor or a repellor. The creation of
non-trivial particle limit cycles characterizes the boundaries between
centrifugal and centripetal regions in parameter space. The discovered
phenomenon is termed oscillatory switching centrifugation and its implications
for particle demixing processes, biological protocols, lab-on-a-chip devices
and dynamical system theory are discussed in the end.

27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph