Search (8 results, page 1 of 1)

  • × author_ss:"Leeuwen, T.N. van"
  • × theme_ss:"Informetrie"
  1. Costas, R.; Bordons, M.; Leeuwen, T.N. van; Raan, A.F.J. van: Scaling rules in the science system : Influence of field-specific citation characteristics on the impact of individual researchers (2009) 0.01
    0.011663082 = product of:
      0.023326164 = sum of:
        0.023326164 = product of:
          0.034989245 = sum of:
            0.0041976487 = weight(_text_:s in 2759) [ClassicSimilarity], result of:
              0.0041976487 = score(doc=2759,freq=4.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.08494043 = fieldWeight in 2759, 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=2759)
            0.030791596 = weight(_text_:22 in 2759) [ClassicSimilarity], result of:
              0.030791596 = score(doc=2759,freq=2.0), product of:
                0.15917034 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.04545348 = queryNorm
                0.19345059 = fieldWeight in 2759, 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=2759)
          0.6666667 = coord(2/3)
      0.5 = coord(1/2)
    
    Date
    22. 3.2009 19:02:48
    Footnote
    Vgl. auch: Raan, A.F.J. van: Scaling rules in the science system: influence of field-specific citation characteristics on the impact of research groups. In: Journal of the American Society for Information Science and Technology. 59(2008) no.4, S.565-576.
    Source
    Journal of the American Society for Information Science and Technology. 60(2009) no.4, S.740-753
  2. Costas, R.; Leeuwen, T.N. van; Bordons, M.: ¬A bibliometric classificatory approach for the study and assessment of research performance at the individual level : the effects of age on productivity and impact (2010) 0.00
    5.936372E-4 = product of:
      0.0011872743 = sum of:
        0.0011872743 = product of:
          0.003561823 = sum of:
            0.003561823 = weight(_text_:s in 3700) [ClassicSimilarity], result of:
              0.003561823 = score(doc=3700,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.072074346 = fieldWeight in 3700, 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=3700)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the American Society for Information Science and Technology. 61(2010) no.8, S.1564-1581
  3. Leeuwen, T.N. van; Tatum, C.; Wouters, P.F: Exploring possibilities to use bibliometric data to monitor gold open access publishing at the national level (2018) 0.00
    5.936372E-4 = product of:
      0.0011872743 = sum of:
        0.0011872743 = product of:
          0.003561823 = sum of:
            0.003561823 = weight(_text_:s in 4458) [ClassicSimilarity], result of:
              0.003561823 = score(doc=4458,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.072074346 = fieldWeight in 4458, 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=4458)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the Association for Information Science and Technology. 69(2018) no.9, S.1161-1173
  4. Costas, R.; Leeuwen, T.N. van; Raan, A.F.J. van: Is scientific literature subject to a 'Sell-By-Date'? : a general methodology to analyze the 'durability' of scientific documents (2010) 0.00
    4.9469766E-4 = product of:
      9.893953E-4 = sum of:
        9.893953E-4 = product of:
          0.0029681858 = sum of:
            0.0029681858 = weight(_text_:s in 3333) [ClassicSimilarity], result of:
              0.0029681858 = score(doc=3333,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.060061958 = fieldWeight in 3333, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=3333)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the American Society for Information Science and Technology. 61(2010) no.2, S.329-339
  5. Costas, R.; Leeuwen, T.N. van: Approaching the "reward triangle" : general analysis of the presence of funding acknowledgments and "peer interactive communication" in scientific publications (2012) 0.00
    4.9469766E-4 = product of:
      9.893953E-4 = sum of:
        9.893953E-4 = product of:
          0.0029681858 = sum of:
            0.0029681858 = weight(_text_:s in 363) [ClassicSimilarity], result of:
              0.0029681858 = score(doc=363,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.060061958 = fieldWeight in 363, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=363)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the American Society for Information Science and Technology. 63(2012) no.8, S.1647-1661
  6. Waltman, L.; Calero-Medina, C.; Kosten, J.; Noyons, E.C.M.; Tijssen, R.J.W.; Eck, N.J. van; Leeuwen, T.N. van; Raan, A.F.J. van; Visser, M.S.; Wouters, P.: ¬The Leiden ranking 2011/2012 : data collection, indicators, and interpretation (2012) 0.00
    4.9469766E-4 = product of:
      9.893953E-4 = sum of:
        9.893953E-4 = product of:
          0.0029681858 = sum of:
            0.0029681858 = weight(_text_:s in 514) [ClassicSimilarity], result of:
              0.0029681858 = score(doc=514,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.060061958 = fieldWeight in 514, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=514)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the American Society for Information Science and Technology. 63(2012) no.12, S.2405-2418
  7. Costas, R.; Leeuwen, T.N. van; Bordons, M.: Referencing patterns of individual researchers : do top scientists rely on more extensive information sources? (2012) 0.00
    4.9469766E-4 = product of:
      9.893953E-4 = sum of:
        9.893953E-4 = product of:
          0.0029681858 = sum of:
            0.0029681858 = weight(_text_:s in 516) [ClassicSimilarity], result of:
              0.0029681858 = score(doc=516,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.060061958 = fieldWeight in 516, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=516)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of the American Society for Information Science and Technology. 63(2012) no.12, S.2433-2450
  8. Moed, H.F.; Leeuwen, T.N. van; Reedijk, J.: ¬A new classification system to describe the ageing of scientific journals and their impact factors (1998) 0.00
    3.9575814E-4 = product of:
      7.915163E-4 = sum of:
        7.915163E-4 = product of:
          0.0023745487 = sum of:
            0.0023745487 = weight(_text_:s in 4719) [ClassicSimilarity], result of:
              0.0023745487 = score(doc=4719,freq=2.0), product of:
                0.049418733 = queryWeight, product of:
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.04545348 = queryNorm
                0.048049565 = fieldWeight in 4719, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  1.0872376 = idf(docFreq=40523, maxDocs=44218)
                  0.03125 = fieldNorm(doc=4719)
          0.33333334 = coord(1/3)
      0.5 = coord(1/2)
    
    Source
    Journal of documentation. 54(1998) no.4, S.387-419