Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge Fluctuation of Dust Grains and its Impact on Dusty Wave
  Propagation   In this paper we consider the influence of dust charge fluctuations on
damping of the dust-ion-acoustic waves. Fluid approximation of longitudinal
electrostatic waves in unmagnetized plasmas is considered. We show that for a
weak acoustic wave the attenuation depends on a phenomenological charging
coefficient.

31
The categories of this paper are: ao-sci
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
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The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex