Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modified Fowler-Nordheim Field-Emission Formulae from a
  Nonplanar-Emitter Model   Field emission formulae, current-voltage characteristics and energy
distribution of emitted electrons, are derived analytically for a nonplanar
(hyperboloidal) metallic emitter model. The traditional Fowler-Nordheim
formulae, which are derived from a planar emitter model, are modified, and the
assumption of the planar emitter in the F-N model is reconsidered. Our
analytical calculation also reveals the backgrounds of the previous numerical
discussion by He et al. on the effect of the geometry of emitter on field
emission. The new formulae contain a parameter which characterizes the
sharpness of the hyperboloidal emitter, and experimental data of field
emissions from clean tungsten emitters and nanotip emitters are analyzed by
making use of this feature.

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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
16
The categories of this paper are: stat