Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature dependent polarization of the thermal radiation emitted by
  thin, hot tungsten wires   We report measurements of the temperature $T $ dependence of the linear
polarization $\langle P\rangle $ of the thermal radiation emitted by thin,
incandescent tungsten wires. We investigated an interval ranging from a little
above room temperature up to melting, $T_m\approx 3700\,$K. These are the first
measurements in such wide a range. We found that $\langle P\rangle $ decreases
with increasing $T.$ We obtained a satisfactory agreement with the theoretical
predictions based on the Kirchhoff's law by using a Drude-type formula for the
optical properties of tungsten. The validity of such formula is assessed in
literature for $T\leq 2400 \,$K and for wavelengths in the range from visible
up to $\lambda\approx 2.6\,\mu$m. We have extended the range of validity of
this formula for $T$ up to $T_m$ and for $\lambda$ up to $\approx 12\,\mu$m.

20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg