-
Mayr, P.; Walter, A.-K.: Abdeckung und Aktualität des Suchdienstes Google Scholar (2006)
0.07
0.06978689 = product of:
0.10468033 = sum of:
0.072989546 = weight(_text_:citation in 5131) [ClassicSimilarity], result of:
0.072989546 = score(doc=5131,freq=2.0), product of:
0.23479973 = queryWeight, product of:
4.6892867 = idf(docFreq=1104, maxDocs=44218)
0.050071523 = queryNorm
0.31085873 = fieldWeight in 5131, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.6892867 = idf(docFreq=1104, maxDocs=44218)
0.046875 = fieldNorm(doc=5131)
0.031690784 = product of:
0.06338157 = sum of:
0.06338157 = weight(_text_:index in 5131) [ClassicSimilarity], result of:
0.06338157 = score(doc=5131,freq=2.0), product of:
0.21880072 = queryWeight, product of:
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.050071523 = queryNorm
0.28967714 = fieldWeight in 5131, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.046875 = fieldNorm(doc=5131)
0.5 = coord(1/2)
0.6666667 = coord(2/3)
- Abstract
- Der Beitrag widmet sich dem neuen Google-Suchdienst Google Scholar. Die Suchmaschine, die ausschließlich wissenschaftliche Dokumente durchsuchen soll, wird mit ihren wichtigsten Funktionen beschrieben und anschließend einem empirischen Test unterzogen. Die durchgeführte Studie basiert auf drei Zeitschriftenlisten: Zeitschriften von Thomson Scientific, Open AccessZeitschriften des Verzeichnisses DOAJ und in der Fachdatenbank SOLIS ausgewertete sozialwissenschaftliche Zeitschriften. Die Abdeckung dieser Zeitschriften durch Google Scholar wurde per Abfrage der Zeitschriftentitel überprüft. Die Studie zeigt Defizite in der Abdeckung und Aktualität des Google Scholarlndex. Weiterhin macht die Studie deutlich, wer die wichtigsten Datenlieferanten für den neuen Suchdienst sind und welche wissenschaftlichen Informationsquellen im Index repräsentiert sind. Die Pluspunkte von Google Scholar liegen in seiner Einfachheit, seiner Suchgeschwindigkeit und letztendlich seiner Kostenfreiheit. Die Recherche in Fachdatenbanken kann Google Scholar trotz sichtbarer Potenziale (z. B. Zitationsanalyse) aber heute aufgrund mangelnder fachlicher Abdeckung und Transparenz nicht ersetzen.
- Theme
- Citation indexing
-
Daquino, M.; Peroni, S.; Shotton, D.; Colavizza, G.; Ghavimi, B.; Lauscher, A.; Mayr, P.; Romanello, M.; Zumstein, P.: ¬The OpenCitations Data Model (2020)
0.02
0.024329849 = product of:
0.072989546 = sum of:
0.072989546 = weight(_text_:citation in 38) [ClassicSimilarity], result of:
0.072989546 = score(doc=38,freq=2.0), product of:
0.23479973 = queryWeight, product of:
4.6892867 = idf(docFreq=1104, maxDocs=44218)
0.050071523 = queryNorm
0.31085873 = fieldWeight in 38, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.6892867 = idf(docFreq=1104, maxDocs=44218)
0.046875 = fieldNorm(doc=38)
0.33333334 = coord(1/3)
- Theme
- Citation indexing
-
Lewandowski, D.; Mayr, P.: Exploring the academic invisible Web (2006)
0.01
0.008802996 = product of:
0.026408987 = sum of:
0.026408987 = product of:
0.052817974 = sum of:
0.052817974 = weight(_text_:index in 3752) [ClassicSimilarity], result of:
0.052817974 = score(doc=3752,freq=2.0), product of:
0.21880072 = queryWeight, product of:
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.050071523 = queryNorm
0.24139762 = fieldWeight in 3752, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.0390625 = fieldNorm(doc=3752)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- Purpose: To provide a critical review of Bergman's 2001 study on the Deep Web. In addition, we bring a new concept into the discussion, the Academic Invisible Web (AIW). We define the Academic Invisible Web as consisting of all databases and collections relevant to academia but not searchable by the general-purpose internet search engines. Indexing this part of the Invisible Web is central to scien-tific search engines. We provide an overview of approaches followed thus far. Design/methodology/approach: Discussion of measures and calculations, estima-tion based on informetric laws. Literature review on approaches for uncovering information from the Invisible Web. Findings: Bergman's size estimate of the Invisible Web is highly questionable. We demonstrate some major errors in the conceptual design of the Bergman paper. A new (raw) size estimate is given. Research limitations/implications: The precision of our estimate is limited due to a small sample size and lack of reliable data. Practical implications: We can show that no single library alone will be able to index the Academic Invisible Web. We suggest collaboration to accomplish this task. Originality/value: Provides library managers and those interested in developing academic search engines with data on the size and attributes of the Academic In-visible Web.
-
Lewandowski, D.; Mayr, P.: Exploring the academic invisible Web (2006)
0.01
0.008802996 = product of:
0.026408987 = sum of:
0.026408987 = product of:
0.052817974 = sum of:
0.052817974 = weight(_text_:index in 2580) [ClassicSimilarity], result of:
0.052817974 = score(doc=2580,freq=2.0), product of:
0.21880072 = queryWeight, product of:
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.050071523 = queryNorm
0.24139762 = fieldWeight in 2580, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.369764 = idf(docFreq=1520, maxDocs=44218)
0.0390625 = fieldNorm(doc=2580)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Abstract
- Purpose: To provide a critical review of Bergman's 2001 study on the deep web. In addition, we bring a new concept into the discussion, the academic invisible web (AIW). We define the academic invisible web as consisting of all databases and collections relevant to academia but not searchable by the general-purpose internet search engines. Indexing this part of the invisible web is central to scientific search engines. We provide an overview of approaches followed thus far. Design/methodology/approach: Discussion of measures and calculations, estimation based on informetric laws. Literature review on approaches for uncovering information from the invisible web. Findings: Bergman's size estimate of the invisible web is highly questionable. We demonstrate some major errors in the conceptual design of the Bergman paper. A new (raw) size estimate is given. Research limitations/implications: The precision of our estimate is limited due to a small sample size and lack of reliable data. Practical implications: We can show that no single library alone will be able to index the academic invisible web. We suggest collaboration to accomplish this task. Originality/value: Provides library managers and those interested in developing academic search engines with data on the size and attributes of the academic invisible web.
-
Daniel, F.; Maier, C.; Mayr, P.; Wirtz, H.-C.: ¬Die Kunden dort bedienen, wo sie sind : DigiAuskunft besteht Bewährungsprobe / Seit Anfang 2006 in Betrieb (2006)
0.01
0.007914666 = product of:
0.023743998 = sum of:
0.023743998 = product of:
0.047487997 = sum of:
0.047487997 = weight(_text_:22 in 5991) [ClassicSimilarity], result of:
0.047487997 = score(doc=5991,freq=2.0), product of:
0.17534193 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.050071523 = queryNorm
0.2708308 = fieldWeight in 5991, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=5991)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 8. 7.2006 21:06:22
-
Mayr, P.; Petras, V.: Building a Terminology Network for Search : the KoMoHe project (2008)
0.01
0.007914666 = product of:
0.023743998 = sum of:
0.023743998 = product of:
0.047487997 = sum of:
0.047487997 = weight(_text_:22 in 2618) [ClassicSimilarity], result of:
0.047487997 = score(doc=2618,freq=2.0), product of:
0.17534193 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.050071523 = queryNorm
0.2708308 = fieldWeight in 2618, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.0546875 = fieldNorm(doc=2618)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Source
- Metadata for semantic and social applications : proceedings of the International Conference on Dublin Core and Metadata Applications, Berlin, 22 - 26 September 2008, DC 2008: Berlin, Germany / ed. by Jane Greenberg and Wolfgang Klas
-
Reichert, S.; Mayr, P.: Untersuchung von Relevanzeigenschaften in einem kontrollierten Eyetracking-Experiment (2012)
0.01
0.0067839995 = product of:
0.020351999 = sum of:
0.020351999 = product of:
0.040703997 = sum of:
0.040703997 = weight(_text_:22 in 328) [ClassicSimilarity], result of:
0.040703997 = score(doc=328,freq=2.0), product of:
0.17534193 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.050071523 = queryNorm
0.23214069 = fieldWeight in 328, 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=328)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Date
- 22. 7.2012 19:25:54
-
Lauser, B.; Johannsen, G.; Caracciolo, C.; Hage, W.R. van; Keizer, J.; Mayr, P.: Comparing human and automatic thesaurus mapping approaches in the agricultural domain (2008)
0.01
0.005653334 = product of:
0.01696 = sum of:
0.01696 = product of:
0.03392 = sum of:
0.03392 = weight(_text_:22 in 2627) [ClassicSimilarity], result of:
0.03392 = score(doc=2627,freq=2.0), product of:
0.17534193 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.050071523 = queryNorm
0.19345059 = fieldWeight in 2627, 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=2627)
0.5 = coord(1/2)
0.33333334 = coord(1/3)
- Source
- Metadata for semantic and social applications : proceedings of the International Conference on Dublin Core and Metadata Applications, Berlin, 22 - 26 September 2008, DC 2008: Berlin, Germany / ed. by Jane Greenberg and Wolfgang Klas
