Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Threefold Reduction in Thermal Conductivity of Vycor Glass Due to
  Adsorption of Liquid 4He   We report thermal conductivity measurements of porous Vycor glass when it is
empty and when the pores are filled with helium between 0.06 and 0.5 K. The
filling of liquid 3He and liquid 4He inside the Vycor pores brings about
respectively two and three fold reduction of the thermal conductivity as
compared with empty Vycor. This dramatic reduction of thermal conductivity, not
seen with solid 3He and 4He in the pores, is the consequence of hydrodynamic
sound modes in liquid helium that greatly facilitate the quantum tunneling of
the two-level systems (TLS) in Vycor and enhance the scattering of the thermal
phonons in the silica network.

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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph