Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vortex tubes in velocity fields of laboratory isotropic turbulence   The streamwise and transverse velocities are measured simultaneously in grid
turbulence at Reynolds numbers 100-300. We extract typical intermittency
patterns, which are consistent with velocity profiles of Burgers and Lamb-Oseen
vortices. The radii of these vortex tubes are estimated to be several of the
Kolmogorov length.

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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: adap-org