A joint work of WUT (J. Sienkiewicz, K. Soja and J. Hołyst) and NTU (P. Sloot) on science of science “Categorial and Geographical Separation in Science” has just appeared in Scientific Reports: https://www.nature.com/articles/s41598-018-26511-4.


We study scientifc collaboration at the level of universities. The scope of this study is to answer two
fundamental questions: (i) can one indicate a category (i.e., a scientifc discipline) that has the greatest
impact on the rank of the university and (ii) do the best universities collaborate with the best ones only?
Restricting ourselves to the 100 best universities from year 2009 we show how the number of publications
in certain categories correlates with the university rank. Strikingly, the expected negative trend is not
observed in all cases – for some categories even positive values are obtained. After applying Principal
Component Analysis we observe clear categorical separation of scientifc disciplines, dividing the papers
into almost separate clusters connected to natural sciences, medicine and arts and humanities. Moreover,
using complex networks analysis, we give hints that the scientifc collaboration is still embedded in the
physical space and the number of common papers decays with the geographical distance between them.

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