Search (29 results, page 1 of 2)

  • × author_ss:"Leydesdorff, L."
  • × type_ss:"a"
  • × year_i:[2000 TO 2010}
  1. Leydesdorff, L.: ¬The construction and globalization of the knowledge base in inter-human communication systems (2003) 0.02 
    0.0205279 = product of:
  0.0410558 = sum of:
    0.0410558 = sum of:
      0.003609657 = weight(_text_:s in 1621) [ClassicSimilarity], result of:
        0.003609657 = score(doc=1621,freq=2.0), product of:
          0.05008241 = queryWeight, product of:
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046063907 = queryNorm
          0.072074346 = fieldWeight in 1621, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046875 = fieldNorm(doc=1621)
      0.03744614 = weight(_text_:22 in 1621) [ClassicSimilarity], result of:
        0.03744614 = score(doc=1621,freq=2.0), product of:
          0.16130796 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046063907 = queryNorm
          0.23214069 = fieldWeight in 1621, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046875 = fieldNorm(doc=1621)
  0.5 = coord(1/2)
    Date
    22. 5.2003 19:48:04
    Source
    Canadian Journal of Communication 28(2003), H.3, S. -
  2. Leydesdorff, L.: Can networks of journal-journal citations be used as indicators of change in the social sciences? (2003) 0.02 
    0.0205279 = product of:
  0.0410558 = sum of:
    0.0410558 = sum of:
      0.003609657 = weight(_text_:s in 4460) [ClassicSimilarity], result of:
        0.003609657 = score(doc=4460,freq=2.0), product of:
          0.05008241 = queryWeight, product of:
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046063907 = queryNorm
          0.072074346 = fieldWeight in 4460, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046875 = fieldNorm(doc=4460)
      0.03744614 = weight(_text_:22 in 4460) [ClassicSimilarity], result of:
        0.03744614 = score(doc=4460,freq=2.0), product of:
          0.16130796 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046063907 = queryNorm
          0.23214069 = fieldWeight in 4460, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046875 = fieldNorm(doc=4460)
  0.5 = coord(1/2)
    Date
    6.11.2005 19:02:22
    Source
    Journal of documentation. 59(2003) no.1, S.84-104
  3. Leydesdorff, L.; Sun, Y.: National and international dimensions of the Triple Helix in Japan : university-industry-government versus international coauthorship relations (2009) 0.02 
    0.0205279 = product of:
  0.0410558 = sum of:
    0.0410558 = sum of:
      0.003609657 = weight(_text_:s in 2761) [ClassicSimilarity], result of:
        0.003609657 = score(doc=2761,freq=2.0), product of:
          0.05008241 = queryWeight, product of:
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046063907 = queryNorm
          0.072074346 = fieldWeight in 2761, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.0872376 = idf(docFreq=40523, maxDocs=44218)
            0.046875 = fieldNorm(doc=2761)
      0.03744614 = weight(_text_:22 in 2761) [ClassicSimilarity], result of:
        0.03744614 = score(doc=2761,freq=2.0), product of:
          0.16130796 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046063907 = queryNorm
          0.23214069 = fieldWeight in 2761, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.046875 = fieldNorm(doc=2761)
  0.5 = coord(1/2)
    Date
    22. 3.2009 19:07:20
    Source
    Journal of the American Society for Information Science and Technology. 60(2009) no.4, S.778-788
  4. Leydesdorff, L.: Should co-occurrence data be normalized : a rejoinder (2007) 0.00 
    0.0018048285 = product of:
  0.003609657 = sum of:
    0.003609657 = product of:
      0.007219314 = sum of:
        0.007219314 = weight(_text_:s in 627) [ClassicSimilarity], result of:
          0.007219314 = score(doc=627,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.14414869 = fieldWeight in 627, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.09375 = fieldNorm(doc=627)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 58(2007) no.14, S.2411-2413
  5. Leydesdorff, L.; Bensman, S.: Classification and Powerlaws : the logarithmic transformation (2006) 0.00 
    0.0012762066 = product of:
  0.0025524131 = sum of:
    0.0025524131 = product of:
      0.0051048263 = sum of:
        0.0051048263 = weight(_text_:s in 6007) [ClassicSimilarity], result of:
          0.0051048263 = score(doc=6007,freq=4.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.101928525 = fieldWeight in 6007, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=6007)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 57(2006) no.11, S.1470-1486
  6. Leydesdorff, L.; Heimeriks, G.: ¬The self-organization of the European information society : the case of "biotechnology" (2001) 0.00 
    0.0010635054 = product of:
  0.0021270108 = sum of:
    0.0021270108 = product of:
      0.0042540217 = sum of:
        0.0042540217 = weight(_text_:s in 6524) [ClassicSimilarity], result of:
          0.0042540217 = score(doc=6524,freq=4.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08494043 = fieldWeight in 6524, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0390625 = fieldNorm(doc=6524)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Footnote
    Vgl. auch die Stellungnahme von P. van den Besselaar: Empirical evidence of self-organization? in: JASIST 54(2003) no.1, S.87-90.
    Source
    Journal of the American Society for Information Science and technology. 52(2001) no.14, S.1262-1274
  7. Leydesdorff, L.: Dynamic and evolutionary updates of classificatory schemes in scientific journal structures (2002) 0.00 
    0.0010528166 = product of:
  0.0021056333 = sum of:
    0.0021056333 = product of:
      0.0042112665 = sum of:
        0.0042112665 = weight(_text_:s in 1249) [ClassicSimilarity], result of:
          0.0042112665 = score(doc=1249,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08408674 = fieldWeight in 1249, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0546875 = fieldNorm(doc=1249)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and technology. 53(2002) no.12, S.987-994
  8. Leydesdorff, L.: Similarity measures, author cocitation Analysis, and information theory (2005) 0.00 
    0.0010528166 = product of:
  0.0021056333 = sum of:
    0.0021056333 = product of:
      0.0042112665 = sum of:
        0.0042112665 = weight(_text_:s in 3471) [ClassicSimilarity], result of:
          0.0042112665 = score(doc=3471,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08408674 = fieldWeight in 3471, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0546875 = fieldNorm(doc=3471)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 56(2005) no.7, S.769-772
  9. Leydesdorff, L.; Zhou, P.: Co-word analysis using the Chinese character set (2008) 0.00 
    0.0010528166 = product of:
  0.0021056333 = sum of:
    0.0021056333 = product of:
      0.0042112665 = sum of:
        0.0042112665 = weight(_text_:s in 1970) [ClassicSimilarity], result of:
          0.0042112665 = score(doc=1970,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.08408674 = fieldWeight in 1970, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0546875 = fieldNorm(doc=1970)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 59(2008) no.9, S.1528-1530
  10. Leydesdorff, L.: ¬The university-industry knowledge relationship : analyzing patents and the science base of technologies (2004) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 2887) [ClassicSimilarity], result of:
          0.003609657 = score(doc=2887,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 2887, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=2887)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 55(2004) no.11, S.991-1001
  11. Leydesdorff, L.: Clusters and maps of science journals based on bi-connected graphs in Journal Citation Reports (2004) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 4427) [ClassicSimilarity], result of:
          0.003609657 = score(doc=4427,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 4427, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=4427)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of documentation. 60(2004) no.4, S.371-427
  12. Leydesdorff, L.; Bihui, J.: Mapping the Chinese Science Citation Database in terms of aggregated journal-journal citation relations (2005) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 4813) [ClassicSimilarity], result of:
          0.003609657 = score(doc=4813,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 4813, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=4813)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 56(2005) no.14, S.1469-1479
  13. Leydesdorff, L.: Can scientific journals be classified in terms of aggregated journal-journal citation relations using the Journal Citation Reports? (2006) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 5046) [ClassicSimilarity], result of:
          0.003609657 = score(doc=5046,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 5046, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=5046)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 57(2006) no.5, S.601-613
  14. Zhou, P.; Leydesdorff, L.: ¬A comparison between the China Scientific and Technical Papers and Citations Database and the Science Citation Index in terms of journal hierarchies and interjournal citation relations (2007) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 70) [ClassicSimilarity], result of:
          0.003609657 = score(doc=70,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 70, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=70)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 58(2007) no.2, S.223-236
  15. Leydesdorff, L.: Betweenness centrality as an indicator of the interdisciplinarity of scientific journals (2007) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 453) [ClassicSimilarity], result of:
          0.003609657 = score(doc=453,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 453, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=453)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 58(2007) no.9, S.1303-1319
  16. Leydesdorff, L.: On the normalization and visualization of author co-citation data : Salton's Cosine versus the Jaccard index (2008) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 1341) [ClassicSimilarity], result of:
          0.003609657 = score(doc=1341,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 1341, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=1341)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 59(2008) no.1, S.77-85
  17. Leydesdorff, L.: Caveats for the use of citation indicators in research and journal evaluations (2008) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 1361) [ClassicSimilarity], result of:
          0.003609657 = score(doc=1361,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 1361, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=1361)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 59(2008) no.2, S.278-287
  18. Leydesdorff, L.: Patent classifications as indicators of intellectual organization (2008) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 2002) [ClassicSimilarity], result of:
          0.003609657 = score(doc=2002,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 2002, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=2002)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.1582-1597
  19. Leydesdorff, L.; Schank, T.: Dynamic animations of journal maps : indicators of structural changes and interdisciplinary developments (2008) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 2358) [ClassicSimilarity], result of:
          0.003609657 = score(doc=2358,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 2358, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=2358)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 59(2008) no.11, S.1810-1818
  20. Egghe, L.; Leydesdorff, L.: ¬The relation between Pearson's correlation coefficient r and Salton's cosine measure (2009) 0.00 
    9.0241426E-4 = product of:
  0.0018048285 = sum of:
    0.0018048285 = product of:
      0.003609657 = sum of:
        0.003609657 = weight(_text_:s in 2803) [ClassicSimilarity], result of:
          0.003609657 = score(doc=2803,freq=2.0), product of:
            0.05008241 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046063907 = queryNorm
            0.072074346 = fieldWeight in 2803, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.046875 = fieldNorm(doc=2803)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 60(2009) no.5, S.1027-1036

Authors

Themes