Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frequency structure of the nonlinear instability of a dragged viscous
  thread   A thread of viscous fluid falling onto a moving surface exhibits a
spectacular variety of types of motion as the surface speed and nozzle height
are varied. For modest nozzle heights, four clear regimes are observed. For
large surface speed, the thread is dragged into a stretched centenary
configuration which is confined to a plane. As the surface speed is lowered,
this exhibits a supercritical bifurcation to a meandering state. At very low
surface speeds, the state resembles the usual coiling motion of a viscous
thread falling on a stationary surface. In between the meandering and coiling
regimes, a window containing a novel multifrequency state, previously called
"figures of eight" is found. Using an improved visualization technique and a
fully automated apparatus, we made detailed measurements of the longitudinal
and transverse motion of the thread in all these states. We found that the
multifrequency state is characterized by a complex pattern of motion whose main
frequencies are locked in a 3:2 ratio. This state appears and disappears with
finite amplitude at sharp bifurcations without measurable hysteresis.

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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: econ