Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cellulose-Bound Magnesium Diboride Superconductivity   Two-phase superconductor tapes were produced by blending high purity
magnesium diboride powder with a liquid ethylcellulose-based polymeric binder.
This procedure produced a material which is easily formable with a high
superconducting transition temperature (38K). We show that the bulk
superconducting properties are not affected by the presence of the binder, nor
is there any evidence of a chemical reaction between the superconducting
particles and the binder. However, the transport properties of the material are
strongly affected by the presence of the binder, which leads to a seven order
of magnitude increase of the normal state resistance along with a seven order
of magnitude decrease of the transport critical current density. This new
material is shown to be equivalent to a system of coupled Josephson junctions.

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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg