Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematics of Electrons in the Volume of a Planar Vacuum Diode   The kinematics laws of electrons motion in the volume of planar vacuum diode
are obtained. The physically acceptable initial and boundary conditions for the
regime of changing of current are presented. A new solution allowing diode
self-clogging is suggested.

36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess