Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoplastic effects in chalcogenide glasses: A review   A synopsis of the various photoinduced changes of rheological, mechanical and
elastic properties is presented in the first part of the article. After a
critical appraisal of a large body of experimental data it suggested that the
photoviscous effect, that is, the athermal decrease of viscosity of a
non-crystalline chalcogenide upon illumination is the key for a plethora of
photoinduced effects reported so far in the literature under different names.
Morphic effects (shape or surface morphology) may ap-pear either in the
presence or absence of external mechanical stimuli leading to the fabrication
of a variety of technologically important photoprocessed structures. A few
representative examples of photoplastic effects are described, in the second
part of the paper, in some detail based on information provided by in situ
Raman scattering and nanoindentation experiments.

34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph