Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The influence of Lifshitz forces and gas on premelting of ice within
  porous materials   Premelting of ice within pores in earth materials is shown to depend on the
presence of vapor layers. For thick vapor layers between ice and pore surfaces,
a nanosized water sheet can be formed due to repulsive Lifshitz forces. In the
absence of vapor layers, ice is inhibited from melting near pore surfaces. In
between these limits, we find an enhancement of the water film thickness in
silica and alumina pores. In the presence of metallic surface patches in the
pore, the Lifshitz forces can dramatically widen the water film thickness, with
potential complete melting of the ice surface.

26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess