Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectrally-wide acoustic frequency combs generated using oscillations of
  polydisperse gas bubble clusters in liquids   Acoustic frequency combs leverage unique properties of the optical frequency
comb technology in high-precision measurements and innovative sensing in
optically inaccessible environments such as under water, under ground or inside
living organisms. Because acoustic combs with wide spectra would be required
for many of these applications but techniques of their generation have not yet
been developed, here we propose a new approach to the creation of
spectrally-wide acoustic combs using oscillations of polydisperse gas bubble
clusters in liquids. By means of numerical simulations we demonstrate that
clusters consisting of bubbles with precisely controlled sizes can produce wide
acoustic spectra composed of equally-spaced coherent peaks. We show that under
typical experimental conditions bubble clusters remain stable over time
required for a reliable recording of comb signals. We also demonstrate that the
spectral composition of combs can be tuned by adjusting the number and size of
bubbles in a cluster.

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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th