Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Similarity of skeletal structures in laboratory and space and the
  probable role of self-assembling of a fractal dust in fusion devices   This papers briefly reviews the progress in studying the long-lived
filamentary structures of a skeletal form (namely, tubules and cartwheels, and
their simple combinations) in electric discharges in various fusion devices.
These include fast Z-pinch, tokamak and laser produced plasmas. We also report
on the results of a search for the phenomenon of skeletal structures --
formerly revealed in laboratory data from fusion devices -- at larger and much
larger length scales, including the powerful electromagnetic phenomena in the
Earth atmosphere and cosmic space. It is found that the similarity of, and a
trend toward self-similarity in, the observed skeletal structures more or less
uniformly covers the range 10^{-5} cm - 10^{23} cm. These evidences suggest all
these skeletal structures, similarly to skeletons in the particles of dust and
hail, to possess a fractal condensed matter of particular topology of the
fractal. The probable role of the phenomenon of self-assembling of a fractal
dust in fusion devices and outside the fusion is discussed briefly.

28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th