Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining the Mechanical Properties of a New Composite Material Using
  Artificial Neural Networks   The paper studies the possibility of using artificial neural networks (ANN)
to determine certain mechanical properties of a new composite material. This
new material is obtained by a mixture of hemp and polypropylene fibres. The
material was developed for the industry of upholstered furniture. Specifically,
it is intended for the making of elements of the support structure of some
upholstered goods (chairs, armchairs, sofa sides) with the objective of
replacing wood. The paper aims to calculate the following mechanical
properties: maximum tensile strength and maximum elongation.

33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess