Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shape oscillation of a levitated drop in an acoustic field   A `star drop' refers to the patterns created when a drop, flattened by some
force, is excited into shape mode oscillations. These patterns are perhaps best
understood as the two dimensional analog to the more common three dimensional
shape mode oscillations. In this fluid dynamics video an ultrasonic standing
wave was used to levitate a liquid drop. The drop was then flattened into a
disk by increasing the field strength. This flattened drop was then excited to
create star drop patterns by exciting the drop at its resonance frequency.
Different oscillatory modes were induced by varying the drop radius, fluid
properties, and frequency at which the field strength was modulated.

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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
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
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
16
The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an