Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polyethylene Identification in ocean water samples by means of 50 keV
  energy electron beam   The study presented hereafter shows a new methodology to reveal traces of
polyethylene (the most common microplastic particles, known as a structure of
C_2 H_4) in a sample of ocean water by the irradiation of a 50 keV, 1 uA
electron beam. This is performed by analyzing the photon (produced by the
electrons in water ) fluxes and spectra (i.e. fluxes as a function of photon
energy) at different types of contaminated water with an adequate device and in
particular looking at the peculiar interactions of electrons/photons with the
potential abnormal atomic hydrogen (H), oxygen (O), carbon (C), phosphorus (P)
compositions present in the water, as a function of living and not living
organic organisms with a PO4 group RNA/DNA strands in a cluster configuration
through a volumetric cells grid.

33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol