Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-optical investigations of Ag-sheathed Bi-2223 tapes with
  ferromagnetic shielding   An increase in the critical current and suppression of AC losses in
superconducting wires and tapes with soft magnetic sheath have been predicted
theoretically and confirmed experimentally. In this work we present the results
of magneto-optical investigations on a series of Ag-sheathed Bi-2223 tapes with
Ni coating. We visualize distributions of magnetic field at increasing external
field and different temperatures, demonstrating a difference between the flux
propagation in the superconductor with Ni rims and a reference sample without
Ni coating.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph