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Open data sources in VOSviewer

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Presentation at Wuhan University, Wuhan, China, April 15, 2019.

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Open data sources in VOSviewer

  1. 1. Large-scale visualization of science Nees Jan van Eck Centre for Science and Technology Studies (CWTS), Leiden University Wuhan University Wuhan, China, April 15, 2019
  2. 2. Bibliographic data sources 1 PATSTAT
  3. 3. Bibliographic data sources 2 Web of Science Scopus Journals 20,000 24,000 Publications 55 million 45 million Citations 1.2 billion 1.2 billion
  4. 4. Bibliometric networks 3 WoS Scopus Dimensions PubMed Crossref Citation network of pubs / journals / authors / orgs / countries Co-authorship network of authors / orgs / countries Co-citation network of pubs / journals / authors / orgs / countries Co-occurrence network of keywords / terms Bibliographic coupling network of pubs / journals / authors Bibliographic data source
  5. 5. Outline • Software tools • Network analysis techniques • Algorithmically constructed classification system of science 4
  6. 6. Software tools 5
  7. 7. VOSviewer 6
  8. 8. Users of VOSviewer • Researchers • Research institutions • Research funders • Scientific publishers • Industry 7
  9. 9. 8
  10. 10. 9
  11. 11. Development 10
  12. 12. Data access 11 Download
  13. 13. Interactive querying 12
  14. 14. 13
  15. 15. 14
  16. 16. CitNetExplorer 15
  17. 17. Network analysis techniques 16
  18. 18. Network analysis techniques 17 Layout: • AKA mapping • Visualization of similarities (VOS) Clustering: • AKA community detection • Leiden algorithm
  19. 19. VOS 18
  20. 20. Leiden algorithm 19
  21. 21. Algorithmic classification systems of science 20
  22. 22. CWTS publication-level classification system of science • Based on all articles in reviews in Web of Science between 2000 and 2017 • 21.2 million publications • 374.1 million citation links • Classification system of 3 hierarchical levels: – 22 broad disciplines – 868 fields – 4,047 subfields • Computational performance using the Leiden algorithm: less than 2hrs 21
  23. 23. 22 Structure of science based on 4,000 micro-level fields Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering Size of a field is proportional to the number of publications in the field
  24. 24. 23 Structure of science based on 4,000 micro-level fields Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering Size of a field is proportional to the number of publications in the field Scientometrics
  25. 25. Summary of scientometrics subfield 24 Cluster: 145 No. publications: 16,312 Top 5 terms No. pubs bibliometric analysis 852 impact factor 495 h index 264 peer review 515 citation 642 Top 5 publications No. cits hirsch, je (2005). an index to quantify an individual's scientific research output. p natl acad sci usa, 102(46), 16569-16572. 2,635 wuchty, s; et al. (2007). the increasing dominance of teams in production of knowledge. science, 316(5827), 1036-1039. 699 egghe, l (2006). theory and practise of the g-index. scientometrics, 69(1), 131-152. 609 king, da (2004). the scientific impact of nations. nature, 430(6997), 311-316. 496 newman, mej (2004). coauthorship networks and patterns of scientific collaboration. p natl acad sci usa, 101, 5200-5205. 488 Top 5 authors No. pubs Top 5 journals No. pubs bornmann, l 221 scientometrics 2,865 thelwall, m 202 journal of informetrics 700 leydesdorff, l 175 journal of the american society for information science and technology 613 rousseau, r 161 plos one 339 egghe, l 133 research evaluation 324 Top 5 institutes No. pubs Top 5 departments No. pubs univ granada 316 sch lib & informat sci (indiana univ) 106 kathol univ leuven 256 amsterdam sch commun res ascor (univ amsterdam) 97 leiden univ 249 ctr sci & technol studies (leiden univ) 90 indiana univ 246 sch publ policy (georgia inst technol - atlanta) 88 univ wolverhampton 216 trend res ctr (asia univ) 84 0 200 400 600 800 1,000 1,200 1,400 1,600 2000 2002 2004 2006 2008 2010 2012 2014 2016 No.publications
  26. 26. Publications in scientometrics subfield 25
  27. 27. Term map of scientometrics field 26 Peer review, OA, careers, and gender Collaboration Scientometric indicators and networks Medical research Country-level analyses
  28. 28. 27 Time-line map of highly cited scientometrics publications
  29. 29. Overlay visualizations 28 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  30. 30. Time trend 29 MicroRNA Graphene
  31. 31. Summary of graphene subfield 30 Cluster: 9 No. publications: 27,771 Top 5 terms No. pubs bilayer graphene 836 epitaxial graphene 491 silicene 401 graphene nanoribbon 1,035 graphene field effect transistor 207 Top 5 publications No. cits novoselov, ks; et al. (2004). electric field effect in atomically thin carbon films. science, 306(5696), 666-669. 27,743 geim, ak; et al. (2007). the rise of graphene. nat mater, 6(3), 183-191. 20,073 novoselov, ks; et al. (2005). two-dimensional gas of massless dirac fermions in graphene. nature, 438(7065), 197-200. 11,359 castro neto, ah; et al. (2009). the electronic properties of graphene. rev mod phys, 81(1), 109-162. 11,368 zhang, yb; et al. (2005). experimental observation of the quantum hall effect and berry's phase in graphene. nature, 438(7065), 201-204. 8,110 Top 5 authors No. pubs Top 5 journals No. pubs watanabe, k 249 physical review b 4,013 taniguchi, t 240 applied physics letters 1,834 peeters, fm 233 carbon 994 lin, mf 178 nano letters 906 katsnelson, mi 177 journal of applied physics 841 Top 5 institutes No. pubs Top 5 departments No. pubs chinese acad sci 1,394 dept phys (natl univ singapore) 257 russian acad sci 778 inst phys (chinese acad sci) 226 peking univ 557 inst mol & mat (radboud univ nijmegen) 216 natl univ singapore 482 dept phys (mit) 209 tsing hua univ 458 dept phys (univ calif berkeley and berkeley national lab) 206 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 2000 2002 2004 2006 2008 2010 2012 2014 2016 No.publications
  32. 32. Open access 31 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  33. 33. Collaboration with industry 32 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  34. 34. Collaboration with hospitals 33 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  35. 35. Citations from patents 34 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  36. 36. China’s publication output 35 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  37. 37. China’s publication output and time trend 36 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  38. 38. Wuhan University’s publication output 37 Social sciences and humanities Biomedical and health sciences Life and earth sciences Mathematics and computer science Physical sciences and engineering
  39. 39. Wuhan University’s research strengths 38 Share of an area’s highly cited publications authored by Wuhan University Nano carriers drug delivery Sodium-ion batteries Remote sensing GPS precise point positioning Dye-sensitized solar cells Catalysis Image restoration super resolution
  40. 40. Do it yourself! 39 www.vosviewer.com www.citnetexplorer.nl
  41. 41. Thank you for your attention! 40

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