Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EPR measurements of ceramic cores used in the aircraft industry   In this work the electron paramagnetic resonance (EPR) spectra of Al2O3 and
ZrO2 powders were measured for different size of grains (0.074, 0.044 mm) as
well as the mullites (0.07 and 0.12 mm). Also were investigated the ceramic
cores. The measurements were performed at room temperature and in the
temperature range from 140 up to 380 K. The main purpose of this work was to
investigate the possible relationships between the EPR spectra and the size of
powder grains as well as the identification of EPR spectra in view of the
potential application of EPR technique as a fingerprinting method.

31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat