Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The missing pieces of the PuO 2 nanoparticle puzzle   The nanoscience field often produces results more mystifying than any other
discipline. It has been argued that changes in the plutonium dioxide (PuO2)
particle size from bulk to nano can have a drastic effect on PuO2 properties.
Here we report a full characterization of PuO2 nanoparticles (NPs) at the
atomic level and probe their local and electronic structures by a variety of
methods available at the synchrotron.

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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an