Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A common supersolid low-density skin sliperizing ice and toughening
  water surface   Skins of water and ice share the same attribute of supersolidity
characterized by the identical H-O vibration frequency of 3450 cm-1. Molecular
undercoordination and inter-electron-pair repulsion shortens the H-O bond and
lengthen the O:H nonbond, leading to a dual process of nonbonding electron
polarization. This relaxation-polarization process enhances the dipole moment,
elasticity,viscosity, thermal stability of these skins with 25% density loss,
which is responsible for the hydrophobicity and toughness of water skin and for
the slippery of ice.

31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph