Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alteration of Domain Microstructure by Ultrasound In Lithium Niobate   A reorientation of the ferroelectric domains under an action of ultrasound in
LiNbO3 is observed for the first time. The involvement of the ferroelectric
domain boundaries is experimentally identified by the analysis of X-ray
reflection and crystal etching. The reorientation of the domains takes place
under acoustic deformation of the order of 1E-5 in megahertz frequency range.

12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math