Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Artificial_Micrometeorites   An iron ball, a beryllium sphere and a tungsten tube segment with diameter
twenty microns, are electrically charged while proton beam irradiating. These
bodies are accelerated by the running pulse field in a spiral waveguide up to
velocity: thirty kilometers per second. The accelerator, generating
micrometeorites is placed at satellites on the Earth orbit. This article
considers processes of penetration of micrometeorites into the Earth
atmosphere. It is shown that micrometeorites evaporate at the height of one
hundred kilometers-one hundred fifty kilometers from the surface of the Earth.
A micrometeorite which is a segment of the beryllium tube equipped with a
graphite cone in the head part is the very meteorite to reach the Earth surface
without being broken.

11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat