Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthesis and characterization of Ni0 NPs immobilized on acid activated
  montmorillonite (Ni{\deg}-Mont) as an efficient and reusable heterogeneous
  catalyst for one-pot synthesis of biscoumarins under microwave irradiation
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ