Pacs – PACS (Physics and Astronomy Classification Scheme) network available here. For every paper that appeared in Physical Review A, B, C, D, E, Letters and Special Topics: Accelerators and Beams between 1977-2007, a link is included between the APS PACS codes that are referenced in the paper.
References: M. Herrera, D.C. Roberts and N. Gulbahce, PLoS ONE 5(5): e10355.
Using Cfinder, communities of scientific fields can be
identified using the PACS network. Nodes in the scientific
concept network shown on the right correspond to scientific
fields and edges between them signify the overlap between
the fields. The edge weights are correlated with the community
overlap size. The node size is correlated with the size of the
community, hence the number of PACS codes contained
in the community.
Community structure shown in 1997 and 2005 with Cfinder, clique
number of 9 and paper lifetime of 2.5 years.
Data and description for the 1997 network shown in Figure 1.
Data and description for the 2005 network shown in Figure 2.