Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of concentration density maxima of small dispersive coal dust
  particles in horizontal iodine air filter at air-dust aerosol blow   The spatial distributions of the small dispersive coal dust particles with
the nano and micro sizes in the granular filtering medium with the cylindrical
coal granules in the absorber in the horizontal iodine air filter during its
long term operation at the nuclear power plant are researched. It is shown that
the concentration density maxima of the small dispersive coal dust particles
appear in the granular filtering medium with the cylindrical coal absorbent
granules in the horizontal iodine air filter at an action by the air dust
aerosol blow. The comparison of the measured aerodynamic resistances of the
horizontal and vertical iodine air filters is conducted. The main conclusion is
that the magnitude of the aerodynamic resistance of the horizontal iodine air
filters is much smaller in comparison with the magnitude of the aerodynamic
resistance of the vertical iodine air filters at the same loads of the air dust
aerosol volumes. It is explained that the direction of the air dust aerosol
blow and the direction of the gravitation force in the horizontal iodine air
filter are orthogonal, hence the effective accumulation of the small dispersive
coal dust particles takes place at the bottom of absorber in the horizontal
iodine air filter. It is found that the air dust aerosol stream flow in the
horizontal iodine air filter is not limited by the appearing structures, made
of the precipitated small dispersive coal dust particles, in distinction from
the vertical iodine air filter, in the process of long term operation of the
iodine air filters at the nuclear power plant.

2
The categories of this paper are: math
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org