Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optimization of a NdFeB permanent magnet configuration for in-vivo drug
  delivery experiments   We propose a new concept of magnetic focusing for targeting and accumulation
of functionalized superparamagnetic nanoparticles in living organs through
composite configurations of different permanent magnets. The proposed setups
fulfill two fundamental requirements for in vivo experiments: 1) reduced size
of the magnets to best focusing on small areas representing the targeted organs
of mice and rats and 2) maximization of the magnetic driving force acting on
the magnetic nanoparticles dispersed in blood. To this aim, several
configurations of permanent magnets organized with different degrees of
symmetry have been tested. The product B*grad(B) proportional to the magnetic
force has been experimentally measured, over a wide area (20x20 mm^2), at a
distance corresponding to the hypothetical distance of the mouse organ from the
magnets. A non-symmetric configuration of mixed shape permanent magnets
resulted in particularly promising to achieve the best performances for further
in vivo experiments.

16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an