Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficiency of size-dependent particle separation by pinched flow
  fractionation   Pinched flow fractionation is shown to be an efficient and selective way to
quickly separate particles by size in a very polydisperse semi-concentrated
suspension. In an effort to optimize the method, we discuss the quantitative
influence of the pinching intensity in the balance between the requirements of
selectivity and minimal dilution.

32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph