Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation on Radio Wave Propagation in Shallow Seawater: Simulations
  and Measurements   The authors present full wave simulations and experimental results of
propagation of electromagnetic waves in shallow seawaters. Transmitter and
receiver antennas are ten-turns loops placed on the seabed. Some propagation
frameworks are presented and simulated. Finally, simulation results are
compared with experimental ones.

5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin