Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Study on the Effect of Exit Widths and Crowd Sizes in the Formation of
  Arch in Clogged Crowds   The arching phenomenon is an emergent pattern formed by a $c$-sized crowd of
intelligent, goal-oriented, autonomous, heterogeneous individuals moving
towards a $w$-wide exit along a long $W$-wide corridor, where $W>w$. We
collected empirical data from microsimulations to identify the combination
effects of~$c$ and~$w$ to the time~$T$ of the onset of and the size~$S$ of the
formation of the arch. The arch takes on the form of the perimeter of a half
ellipse halved along the minor axis. We measured the~$S$ with respect to the
lengths of the major~$M$ and minor~$m$ axes of the ellipse, respectively. The
mathematical description of the formation of this phenomenon will be an
important information in the design of walkways to control and easily direct
the flow of large crowds, especially during panic egress conditions.

15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th