Search (12 results, page 1 of 1)

  • × author_ss:"Leydesdorff, L."
  • × year_i:[2010 TO 2020}
  1. Leydesdorff, L.; Bornmann, L.: How fractional counting of citations affects the impact factor : normalization in terms of differences in citation potentials among fields of science (2011) 0.02 
    0.01760727 = product of:
  0.03521454 = sum of:
    0.03521454 = product of:
      0.052821808 = sum of:
        0.020292813 = weight(_text_:12 in 4186) [ClassicSimilarity], result of:
          0.020292813 = score(doc=4186,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 4186, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4186)
        0.032528996 = weight(_text_:22 in 4186) [ClassicSimilarity], result of:
          0.032528996 = score(doc=4186,freq=2.0), product of:
            0.16815145 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.048018172 = queryNorm
            0.19345059 = fieldWeight in 4186, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4186)
      0.6666667 = coord(2/3)
  0.5 = coord(1/2)
    Date
    22. 1.2011 12:51:07
  2. Leydesdorff, L.; Wagner, C,; Bornmann, L.: Replicability and the public/private divide (2016) 0.01 
    0.008117125 = product of:
  0.01623425 = sum of:
    0.01623425 = product of:
      0.04870275 = sum of:
        0.04870275 = weight(_text_:12 in 3023) [ClassicSimilarity], result of:
          0.04870275 = score(doc=3023,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.3667052 = fieldWeight in 3023, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.09375 = fieldNorm(doc=3023)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    14. 6.2016 12:01:54
  3. Leydesdorff, L.; Bornmann, L.; Wagner, C.S.: ¬The relative influences of government funding and international collaboration on citation impact (2019) 0.01 
    0.0065057995 = product of:
  0.013011599 = sum of:
    0.013011599 = product of:
      0.039034795 = sum of:
        0.039034795 = weight(_text_:22 in 4681) [ClassicSimilarity], result of:
          0.039034795 = score(doc=4681,freq=2.0), product of:
            0.16815145 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.048018172 = queryNorm
            0.23214069 = fieldWeight in 4681, 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=4681)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    8. 1.2019 18:22:45
  4. Leydesdorff, L.; Hammarfelt, B.: ¬The structure of the Arts & Humanities Citation Index : a mapping on the basis of aggregated citations among 1,157 journals (2011) 0.01 
    0.00585803 = product of:
  0.01171606 = sum of:
    0.01171606 = product of:
      0.03514818 = sum of:
        0.03514818 = weight(_text_:12 in 4941) [ClassicSimilarity], result of:
          0.03514818 = score(doc=4941,freq=6.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.26464668 = fieldWeight in 4941, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4941)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Abstract
    Using the Arts & Humanities Citation Index (A&HCI) 2008, we apply mapping techniques previously developed for mapping journal structures in the Science and Social Sciences Citation Indices. Citation relations among the 110,718 records were aggregated at the level of 1,157 journals specific to the A&HCI, and the journal structures are questioned on whether a cognitive structure can be reconstructed and visualized. Both cosine-normalization (bottom up) and factor analysis (top down) suggest a division into approximately 12 subsets. The relations among these subsets are explored using various visualization techniques. However, we were not able to retrieve this structure using the Institute for Scientific Information Subject Categories, including the 25 categories that are specific to the A&HCI. We discuss options for validation such as against the categories of the Humanities Indicators of the American Academy of Arts and Sciences, the panel structure of the European Reference Index for the Humanities, and compare our results with the curriculum organization of the Humanities Section of the College of Letters and Sciences of the University of California at Los Angeles as an example of institutional organization.
    Date
    13. 2.2012 12:49:45
    Source
    Journal of the American Society for Information Science and Technology. 62(2011) no.12, S.2414-2426
  5. Hellsten, I.; Leydesdorff, L.: ¬The construction of interdisciplinarity : the development of the knowledge base and programmatic focus of the journal Climatic Change, 1977-2013 (2016) 0.01 
    0.0054214997 = product of:
  0.010842999 = sum of:
    0.010842999 = product of:
      0.032528996 = sum of:
        0.032528996 = weight(_text_:22 in 3089) [ClassicSimilarity], result of:
          0.032528996 = score(doc=3089,freq=2.0), product of:
            0.16815145 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.048018172 = queryNorm
            0.19345059 = fieldWeight in 3089, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3089)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    24. 8.2016 17:53:22
  6. Leydesdorff, L.; Johnson, M.W.; Ivanova, I.: Toward a calculus of redundancy : signification, codification, and anticipation in cultural evolution (2018) 0.01 
    0.0054214997 = product of:
  0.010842999 = sum of:
    0.010842999 = product of:
      0.032528996 = sum of:
        0.032528996 = weight(_text_:22 in 4463) [ClassicSimilarity], result of:
          0.032528996 = score(doc=4463,freq=2.0), product of:
            0.16815145 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.048018172 = queryNorm
            0.19345059 = fieldWeight in 4463, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4463)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    29. 9.2018 11:22:09
  7. Rotolo, D.; Rafols, I.; Hopkins, M.M.; Leydesdorff, L.: Strategic intelligence on emerging technologies : scientometric overlay mapping (2017) 0.00 
    0.0040585627 = product of:
  0.008117125 = sum of:
    0.008117125 = product of:
      0.024351375 = sum of:
        0.024351375 = weight(_text_:12 in 3322) [ClassicSimilarity], result of:
          0.024351375 = score(doc=3322,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.1833526 = fieldWeight in 3322, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.046875 = fieldNorm(doc=3322)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    16.11.2017 12:55:36
  8. Leydesdorff, L.; Bornmann, L.: Integrated impact indicators compared with impact factors : an alternative research design with policy implications (2011) 0.00 
    0.0033821356 = product of:
  0.0067642713 = sum of:
    0.0067642713 = product of:
      0.020292813 = sum of:
        0.020292813 = weight(_text_:12 in 4919) [ClassicSimilarity], result of:
          0.020292813 = score(doc=4919,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 4919, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=4919)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    12. 2.2012 17:53:51
  9. Leydesdorff, L.; Rafols, I.; Chen, C.: Interactive overlays of journals and the measurement of interdisciplinarity on the basis of aggregated journal-journal citations (2013) 0.00 
    0.0033821356 = product of:
  0.0067642713 = sum of:
    0.0067642713 = product of:
      0.020292813 = sum of:
        0.020292813 = weight(_text_:12 in 1131) [ClassicSimilarity], result of:
          0.020292813 = score(doc=1131,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 1131, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=1131)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Source
    Journal of the American Society for Information Science and Technology. 64(2013) no.12, S.2573-2586
  10. Bauer, J.; Leydesdorff, L.; Bornmann, L.: Highly cited papers in Library and Information Science (LIS) : authors, institutions, and network structures (2016) 0.00 
    0.0033821356 = product of:
  0.0067642713 = sum of:
    0.0067642713 = product of:
      0.020292813 = sum of:
        0.020292813 = weight(_text_:12 in 3231) [ClassicSimilarity], result of:
          0.020292813 = score(doc=3231,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 3231, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3231)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Source
    Journal of the Association for Information Science and Technology. 67(2016) no.12, S.3095-3100
  11. Leydesdorff, L.; Nooy, W. de: Can "hot spots" in the sciences be mapped using the dynamics of aggregated journal-journal citation relations (2017) 0.00 
    0.0033821356 = product of:
  0.0067642713 = sum of:
    0.0067642713 = product of:
      0.020292813 = sum of:
        0.020292813 = weight(_text_:12 in 3328) [ClassicSimilarity], result of:
          0.020292813 = score(doc=3328,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 3328, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=3328)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    16.11.2017 12:56:42
  12. Leydesdorff, L.; Bornmann, L.; Mingers, J.: Statistical significance and effect sizes of differences among research universities at the level of nations and worldwide based on the Leiden rankings (2019) 0.00 
    0.0033821356 = product of:
  0.0067642713 = sum of:
    0.0067642713 = product of:
      0.020292813 = sum of:
        0.020292813 = weight(_text_:12 in 5225) [ClassicSimilarity], result of:
          0.020292813 = score(doc=5225,freq=2.0), product of:
            0.13281173 = queryWeight, product of:
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.048018172 = queryNorm
            0.15279384 = fieldWeight in 5225, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              2.765864 = idf(docFreq=7562, maxDocs=44218)
              0.0390625 = fieldNorm(doc=5225)
      0.33333334 = coord(1/3)
  0.5 = coord(1/2)
    Date
    15. 4.2019 17:04:12

Authors

Themes