Search (121 results, page 1 of 7)

  • × theme_ss:"Informetrie"
  1. Tavakolizadeh-Ravari, M.: Analysis of the long term dynamics in thesaurus developments and its consequences (2017) 0.02 
    0.023744568 = product of:
  0.11872284 = sum of:
    0.11872284 = weight(_text_:thesaurus in 3081) [ClassicSimilarity], result of:
      0.11872284 = score(doc=3081,freq=12.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.5002464 = fieldWeight in 3081, product of:
          3.4641016 = tf(freq=12.0), with freq of:
            12.0 = termFreq=12.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.03125 = fieldNorm(doc=3081)
  0.2 = coord(1/5)
    Abstract
    Die Arbeit analysiert die dynamische Entwicklung und den Gebrauch von Thesaurusbegriffen. Zusätzlich konzentriert sie sich auf die Faktoren, die die Zahl von Indexbegriffen pro Dokument oder Zeitschrift beeinflussen. Als Untersuchungsobjekt dienten der MeSH und die entsprechende Datenbank "MEDLINE". Die wichtigsten Konsequenzen sind: 1. Der MeSH-Thesaurus hat sich durch drei unterschiedliche Phasen jeweils logarithmisch entwickelt. Solch einen Thesaurus sollte folgenden Gleichung folgen: "T = 3.076,6 Ln (d) - 22.695 + 0,0039d" (T = Begriffe, Ln = natürlicher Logarithmus und d = Dokumente). Um solch einen Thesaurus zu konstruieren, muss man demnach etwa 1.600 Dokumente von unterschiedlichen Themen des Bereiches des Thesaurus haben. Die dynamische Entwicklung von Thesauri wie MeSH erfordert die Einführung eines neuen Begriffs pro Indexierung von 256 neuen Dokumenten. 2. Die Verteilung der Thesaurusbegriffe erbrachte drei Kategorien: starke, normale und selten verwendete Headings. Die letzte Gruppe ist in einer Testphase, während in der ersten und zweiten Kategorie die neu hinzukommenden Deskriptoren zu einem Thesauruswachstum führen. 3. Es gibt ein logarithmisches Verhältnis zwischen der Zahl von Index-Begriffen pro Aufsatz und dessen Seitenzahl für die Artikeln zwischen einer und einundzwanzig Seiten. 4. Zeitschriftenaufsätze, die in MEDLINE mit Abstracts erscheinen erhalten fast zwei Deskriptoren mehr. 5. Die Findablity der nicht-englisch sprachigen Dokumente in MEDLINE ist geringer als die englische Dokumente. 6. Aufsätze der Zeitschriften mit einem Impact Factor 0 bis fünfzehn erhalten nicht mehr Indexbegriffe als die der anderen von MEDINE erfassten Zeitschriften. 7. In einem Indexierungssystem haben unterschiedliche Zeitschriften mehr oder weniger Gewicht in ihrem Findability. Die Verteilung der Indexbegriffe pro Seite hat gezeigt, dass es bei MEDLINE drei Kategorien der Publikationen gibt. Außerdem gibt es wenige stark bevorzugten Zeitschriften."
    Theme
    Konzeption und Anwendung des Prinzips Thesaurus
  2. Nicholls, P.T.: Empirical validation of Lotka's law (1986) 0.02 
    0.022266502 = product of:
  0.111332506 = sum of:
    0.111332506 = weight(_text_:22 in 5509) [ClassicSimilarity], result of:
      0.111332506 = score(doc=5509,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.61904186 = fieldWeight in 5509, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=5509)
  0.2 = coord(1/5)
    Source
    Information processing and management. 22(1986), S.417-419
  3. Nicolaisen, J.: Citation analysis (2007) 0.02 
    0.022266502 = product of:
  0.111332506 = sum of:
    0.111332506 = weight(_text_:22 in 6091) [ClassicSimilarity], result of:
      0.111332506 = score(doc=6091,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.61904186 = fieldWeight in 6091, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=6091)
  0.2 = coord(1/5)
    Date
    13. 7.2008 19:53:22
  4. Fiala, J.: Information flood : fiction and reality (1987) 0.02 
    0.022266502 = product of:
  0.111332506 = sum of:
    0.111332506 = weight(_text_:22 in 1080) [ClassicSimilarity], result of:
      0.111332506 = score(doc=1080,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.61904186 = fieldWeight in 1080, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.125 = fieldNorm(doc=1080)
  0.2 = coord(1/5)
    Source
    Thermochimica acta. 110(1987), S.11-22
  5. Harter, S.P.; Cheng, Y.-R.: Colinked descriptors : improving vocabulary selection for end-user searching (1996) 0.02 
    0.0205634 = product of:
  0.102817 = sum of:
    0.102817 = weight(_text_:thesaurus in 4216) [ClassicSimilarity], result of:
      0.102817 = score(doc=4216,freq=4.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.4332261 = fieldWeight in 4216, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.046875 = fieldNorm(doc=4216)
  0.2 = coord(1/5)
    Abstract
    This article introduces a new concept and technique for information retrieval called 'colinked descriptors'. Borrowed from an analogous idea in bibliometrics - cocited references - colinked descriptors provide a theory and method for identifying search terms that, by hypothesis, will be superior to those entered initially by a searcher. The theory suggests a means of moving automatically from 2 or more initial search terms, to other terms that should be superior in retrieval performance to the 2 original terms. A research project designed to test this colinked descriptor hypothesis is reported. The results suggest that the approach is effective, although methodological problems in testing the idea are reported. Algorithms to generate colinked descriptors can be incorporated easily into system interfaces, front-end or pre-search systems, or help software, in any database that employs a thesaurus. The potential use of colinked descriptors is a strong argument for building richer and more complex thesauri that reflect as many legitimate links among descriptors as possible
    Theme
    Konzeption und Anwendung des Prinzips Thesaurus
  6. Su, Y.; Han, L.-F.: ¬A new literature growth model : variable exponential growth law of literature (1998) 0.02 
    0.019680994 = product of:
  0.09840497 = sum of:
    0.09840497 = weight(_text_:22 in 3690) [ClassicSimilarity], result of:
      0.09840497 = score(doc=3690,freq=4.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.54716086 = fieldWeight in 3690, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.078125 = fieldNorm(doc=3690)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:22:35
  7. Van der Veer Martens, B.: Do citation systems represent theories of truth? (2001) 0.02 
    0.019680994 = product of:
  0.09840497 = sum of:
    0.09840497 = weight(_text_:22 in 3925) [ClassicSimilarity], result of:
      0.09840497 = score(doc=3925,freq=4.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.54716086 = fieldWeight in 3925, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.078125 = fieldNorm(doc=3925)
  0.2 = coord(1/5)
    Date
    22. 7.2006 15:22:28
  8. Diodato, V.: Dictionary of bibliometrics (1994) 0.02 
    0.01948319 = product of:
  0.09741595 = sum of:
    0.09741595 = weight(_text_:22 in 5666) [ClassicSimilarity], result of:
      0.09741595 = score(doc=5666,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.5416616 = fieldWeight in 5666, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=5666)
  0.2 = coord(1/5)
    Footnote
    Rez. in: Journal of library and information science 22(1996) no.2, S.116-117 (L.C. Smith)
  9. Bookstein, A.: Informetric distributions : I. Unified overview (1990) 0.02 
    0.01948319 = product of:
  0.09741595 = sum of:
    0.09741595 = weight(_text_:22 in 6902) [ClassicSimilarity], result of:
      0.09741595 = score(doc=6902,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.5416616 = fieldWeight in 6902, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=6902)
  0.2 = coord(1/5)
    Date
    22. 7.2006 18:55:29
  10. Bookstein, A.: Informetric distributions : II. Resilience to ambiguity (1990) 0.02 
    0.01948319 = product of:
  0.09741595 = sum of:
    0.09741595 = weight(_text_:22 in 4689) [ClassicSimilarity], result of:
      0.09741595 = score(doc=4689,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.5416616 = fieldWeight in 4689, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.109375 = fieldNorm(doc=4689)
  0.2 = coord(1/5)
    Date
    22. 7.2006 18:55:55
  11. Lewison, G.: ¬The work of the Bibliometrics Research Group (City University) and associates (2005) 0.02 
    0.016699877 = product of:
  0.08349938 = sum of:
    0.08349938 = weight(_text_:22 in 4890) [ClassicSimilarity], result of:
      0.08349938 = score(doc=4890,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.46428138 = fieldWeight in 4890, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.09375 = fieldNorm(doc=4890)
  0.2 = coord(1/5)
    Date
    20. 1.2007 17:02:22
  12. Marx, W.; Bornmann, L.: On the problems of dealing with bibliometric data (2014) 0.02 
    0.016699877 = product of:
  0.08349938 = sum of:
    0.08349938 = weight(_text_:22 in 1239) [ClassicSimilarity], result of:
      0.08349938 = score(doc=1239,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.46428138 = fieldWeight in 1239, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.09375 = fieldNorm(doc=1239)
  0.2 = coord(1/5)
    Date
    18. 3.2014 19:13:22
  13. Schneider, J.W.; Borlund, P.: Introduction to bibliometrics for construction and maintenance of thesauri : methodical considerations (2004) 0.01 
    0.014540519 = product of:
  0.072702594 = sum of:
    0.072702594 = weight(_text_:thesaurus in 4423) [ClassicSimilarity], result of:
      0.072702594 = score(doc=4423,freq=2.0), product of:
        0.23732872 = queryWeight, product of:
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.051357865 = queryNorm
        0.30633712 = fieldWeight in 4423, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.6210785 = idf(docFreq=1182, maxDocs=44218)
          0.046875 = fieldNorm(doc=4423)
  0.2 = coord(1/5)
    Theme
    Konzeption und Anwendung des Prinzips Thesaurus
  14. Raan, A.F.J. van: Statistical properties of bibliometric indicators : research group indicator distributions and correlations (2006) 0.01 
    0.011808597 = product of:
  0.059042983 = sum of:
    0.059042983 = weight(_text_:22 in 5275) [ClassicSimilarity], result of:
      0.059042983 = score(doc=5275,freq=4.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.32829654 = fieldWeight in 5275, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=5275)
  0.2 = coord(1/5)
    Date
    22. 7.2006 16:20:22
  15. Larivière, V.; Gingras, Y.; Archambault, E.: ¬The decline in the concentration of citations, 1900-2007 (2009) 0.01 
    0.011808597 = product of:
  0.059042983 = sum of:
    0.059042983 = weight(_text_:22 in 2763) [ClassicSimilarity], result of:
      0.059042983 = score(doc=2763,freq=4.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.32829654 = fieldWeight in 2763, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.046875 = fieldNorm(doc=2763)
  0.2 = coord(1/5)
    Date
    22. 3.2009 19:22:35
  16. Li, T.-C.: Reference sources in periodicals : research note (1995) 0.01 
    0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 5092) [ClassicSimilarity], result of:
      0.055666253 = score(doc=5092,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 5092, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=5092)
  0.2 = coord(1/5)
    Abstract
    Presents a list of 53 periodicals in 22 subject fields which regularly provide bibliographies of theses, research in progress and patents in their particular subject field. The fields of business, economics, history and literature have most periodical listings of dissertations and theses. Also lists 63 periodicals in 25 sub-disciplines which provide rankings or ratings. Rankings and ratings information predominates in the fields of business, sports and games, finance and banking, and library and information science
  17. Pichappan, P.; Sangaranachiyar, S.: Ageing approach to scientific eponyms (1996) 0.01 
    0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 80) [ClassicSimilarity], result of:
      0.055666253 = score(doc=80,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 80, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=80)
  0.2 = coord(1/5)
    Footnote
    Report presented at the 16th National Indian Association of Special Libraries and Information Centres Seminar Special Interest Group Meeting on Informatrics in Bombay, 19-22 Dec 94
  18. Mommoh, O.M.: Subject analysis of post-graduate theses in library, archival and information science at Ahmadu Bello University, Zaria (1995/96) 0.01 
    0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 673) [ClassicSimilarity], result of:
      0.055666253 = score(doc=673,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 673, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=673)
  0.2 = coord(1/5)
    Source
    Library focus. 13/14(1995/96), S.22-25
  19. Chongde, W.; Zhe, W.: Evaluation of the models for Bradford's law (1998) 0.01 
    0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 3688) [ClassicSimilarity], result of:
      0.055666253 = score(doc=3688,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 3688, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=3688)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:12:28
  20. Tijssen, R.J.W.; Wijk, E. van: ¬The global science base of information and communication technologies : bibliometric analysis of ICT research papers (1998) 0.01 
    0.011133251 = product of:
  0.055666253 = sum of:
    0.055666253 = weight(_text_:22 in 3691) [ClassicSimilarity], result of:
      0.055666253 = score(doc=3691,freq=2.0), product of:
        0.1798465 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.051357865 = queryNorm
        0.30952093 = fieldWeight in 3691, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.0625 = fieldNorm(doc=3691)
  0.2 = coord(1/5)
    Date
    22. 5.1999 19:26:54

Authors

Years

Languages

  • e 111
  • d 9
  • ro 1
  • More… Less…

Types

  • a 118
  • el 2
  • m 2
  • s 1
  • x 1
  • More… Less…

Themes

Subjects

Classifications