Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular Motor Constructed from a Double-Walled Carbon Nanotube Driven
  by Axially Varying Voltage   A new molecular motor is conceptually constructed from a double-walled carbon
nanotube (DWNT) consisting of a long inner single-walled carbon nanotube (SWNT)
and a short outer SWNT with different chirality. The interaction between inner
and outer tubes is the sum of the Lennard-Jones potentials between carbon atoms
in inner tube and those in outer one. Within the framework of
Smoluchowski-Feynman ratchet, it is theoretically shown that this system in an
isothermal bath will exhibit a unidirectional rotation in the presence of a
varying axial electrical voltage.

24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin