Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shaping Segregation: Convexity vs. Concavity   Controlling segregation is both a practical and a theoretical challenge. In
this Letter we demonstrate a manner in which rotation-induced segregation may
be controlled by altering the geometry of the rotating containers in which
granular systems are housed. Using a novel drum design comprising concave and
convex geometry, we explore a means by which radial size-segregation may be
used to drive axial segregation, resulting in an order of magnitude increase in
the axial segregation rate. This finding, and the explanations provided of its
underlying mechanisms, could lead to radical new designs for a broad range of
particle processing applications.

34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin