Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal conductivity of solid parahydrogen with methane admixtures   The thermal conductivity of solid parahydrogen crystal with methane
admixtures has been measured in the temperature range 1.5 to 8 K. Solid samples
were grown from the gas mixture at 13 K. Concentration of CH4 admixture
molecules in the gas varied form 5 to 570 ppm. A very broad maximum of thermal
conductivity with absolute value of about 110 W/(m K) is observed at 2.6 K. The
data are interpreted by Callaway model considering phonons resonant scattering
on quasi-local vibrations of CH4 molecules, phonon-grain boundary and
phonon-phonon scattering processes. The increase of grain boundary scattering
leads to the decrease of the maximum broadening. The analysis shows that the
solid mixture of p-H2 and CH4 is a heterogeneous solution for CH4 concentration
higher than 0.1 ppm.

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The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga