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Haal meer uit gewone zoekmachines

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1 Haal meer uit gewone zoekmachines
Wouter Gerritsma, Vrije Universiteit VOGIN

2 Informatie overload? Verminder je de recall!
Gebruik minder database(s) (delen) Limiteer op taal Limiteer op publicatiejaar Limiteer op velden Gebruik nabijheidsoperatoren i.p.v. AND Gebruik specifiekere termen Voeg een aspect toe

3 Gebruik andere database delen
Google.nl, Google.com, Google.co.uk books.google.com scholar.google.com patents.google.com Bing.com vs academic.research.microsoft.com Be warned

4 Limiteer op taal of regio
Via de advanced search

5 Limiteer op periode In Google Scholar Pas op met sort by date
In Google patents In Google [“water management” 2000…2010]

6 Zoek in specifieke velden (ti,kw,ab)
[intitle:”water management”] [allintitle:water management] Werkt precies zo in Google Scholar [intext:”water management”] [allintext:water management]

7 Nabijheidsoperatoren in Google
[“water management” “technology assessment”] [“water management” AROUND(5) “technology assessment”] Vooral effectief om relevante lange teksten te vinden Werkt helaas niet in Google Scholar!

8 Gebruik specifiekere term
["heart disease" "heart attack"] ["heart disease" "myocardial infarction"] Op zoek naar professionele termen? [chocolate thesaurus|glossary|dictionary]

9 Voeg een aspect toe ["water management"]
["water management" "technology assessment"]

10 Boolean en Google: haakjes werken niet! OR gaat voor AND!
a b OR c d a AND (b OR c) AND d a OR b c OR d (a OR b) AND (c OR d) [library technology OR systems] [kinderen OR jongens OR meisjes OR tieners OR pubers dik OR zwaarlijvig OR zwaar OR overgewicht ziek OR ziekelijk OR ziekte OR ziektebeeld]

11 Additionele operatoren
site:[bibliotheek site:wageningenur.nl] [site:*.nasa.* inurl:education] ext:[crinipellis perniciosa ext:pdf]

12 Specifiek Google Scholar

13 General Google Scholar syntax
Use ["phrase searching"] Search for file type ["land degradation" ext:doc] Search for specific domains ["land ownership" site:.ac.uk] !!! Search in titles [allintitle:anatomy plants water] Search with OR ["carbon dioxide" OR CO2] Exclude terms ["nutrient cycling" –nitrogen] Combine ["carbon dioxide" OR co2 intitle:"nutrient cycles" -phosphorus ext:pdf]

14 Pas de settings aan! Search results Languages Library links
Number of results : 20 max Open in a new window Choose the right reference manager Languages Also in available in Dutch Library links Choose link resolver of your University

15 Searching for recent literature!
Use publication years In the advanced search Or use the facets in search result Sort by date???

16 Inclusion of word variants is unclear
Inclusion of word variants is unclear. (Google Scholar has a smaller dictionary than Google.com) No verbatim search, but phrases do work! ["behaviour"] Parentheses () do not work in Google (Scholar)!

17 Search engine result page
Ranking influenced by citations (older articles on top!)

18 Alerts galore For searching GS strings must be kept under 256 characters. For alerts GS strings must be kept under 100 characters My updates : Alerts based on the topics of your publications (different from my Citations)

19 My Citations & My Library
Your personal profile page, concentrating on publication lists and citations. Identifies you co-author network My library Your saved articles Also lists all your references "cited by me" No plugin for word processors (yet)

20 Google Scholar quality
Coverage is still unclear Coverage is constantly growing, probably the most comprehensive scholarly literature database (Harzing, Scientometrics 98 (1): Not all OA repositories are (fully) indexed (https://atmire.com/website/?q=content/google-scholar-and-dspace) Concentrates on scientific articles, share of books is growing, Grey Lit from repositories partially included For systematic reviews Pubmed alone is insufficient, complementary searches in GS and other indexes are a necessity (Bramer, et al Systematic Reviews 2 (1): 115. Metadata sometimes problematic, the version function under the snippet helps

21 Google Scholar and Google
Google and Google Scholar are separate indexes! Google Scholar results are pushed in Google when searching for scientific subjects Make use of that reminder! But not the other way around Some repositories are covered by Google but not in Google Scholar, or partly covered in Google Scholar Google Scholar [site:edepot.wur.nl] Google [site:edepot.wur.nl]

22 Google scholar is getting better at metadata
https://scholar.google.com/scholar_lookup?doi= %2Fscience &issn= &issue=5857&journal=SCIENCE&hl=en&pages= &pmid= &title=Coral%20reefs%20under%20rapid%20climate%20change%20and%20ocean%20acidification&author=O%20Hoegh-Guldberg&publication_year=2007&volume=318 https://scholar.google.com/scholar_lookup?doi= /science https://scholar.google.com/scholar_lookup?issn= &issue=5857&pages= &author=Hoegh-Guldberg&publication_year=2007&volume=318

23 Wouter Gerritsma, Vrije Universiteit VOGIN
Bronnenkennis Wouter Gerritsma, Vrije Universiteit VOGIN

24 Wetenschappelijk zoekmachines
Google Scholar Microsoft Academic Search DeepDyve Defunct: SciRus

25 Bibliografiën/metadazoekmachines
PubMed http://pubmed.gov/ Eric http://www.eric.ed.gov/ LISTA http://www.libraryresearch.com/ WorldWideScience http://worldwidescience.org/

26 Boeken Catalogi Bibliotheek catalogi bijv: http://library.wur.nl/WebQuery/clc/  Open worldcat http://www.worldcat.org/ Hathi Trust http://www.hathitrust.org/ DOAB: Fulltext boeken zoekers Google Booksearch http://books.google.com/

27 E-books aggregators Proj Gutenberg http://www.gutenberg.org/wiki/Main_Page Online Books Page http://onlinebooks.library.upenn.edu/ Internet Archive texts http://www.archive.org/details/texts Gallica, Bibliothèque Numérique http://gallica.bnf.fr/ Freebooks for doctors http://www.freebooks4doctors.com/

28 Open Access Journals DOAJ http://www.doaj.org/
Open J-Gate http://www.openjgate.org/ LivRe! http://livre.cnen.gov.br/Default2I.asp PubMed Central http://www.pubmedcentral.nih.gov/ Highwire Press http://highwire.stanford.edu/ Elektronische Zeitschriftenbibliothek EZB http://rzblx1.uni-regensburg.de/ezeit/index.phtml?bibid=AAAAA&colors=7

29 OA repositories OAI metadata zoekmachines
Narcis http://www.narcis.info/index  BASE http://www.base-search.net/  OAISTER: http://oaister.worldcat.org/ ArXiv http://arxiv.org/ Driver http://www.driver-repository.eu/ Directories of repositories ROAR http://roar.eprints.org/  openDOAR http://www.opendoar.org/

30 Research data Research data repositories NL
DANS https://easy.dans.knaw.nl/ui/home  3TU.Datacentum http://datacentrum.3tu.nl/  Data portal Datacite  http://search.datacite.org/ui Narcis http://www.narcis.nl/search/coll/dataset/Language/en searches DANS, 3TU.Datacentrum, the Language Archive and datasets from Tilburg University, Wageningen University, MPI, DANS-KNAW and CentERdata  Directories of research data repositories Re3Data (in opbouw) http://service.re3data.org/search/ OAD http://oad.simmons.edu/oadwiki/Data_repositories

31 Grey Literature Greynet http://www.greynet.org/
Grijze Literatuur in Nederland (GLIN) http://picarta.pica.nl/xslt/DB=3.2/ GreySource http://www.greynet.org/greysourceindex.html OpenGrey http://www.opengrey.eu/ Dissertaties en Proefschriften NDLTD http://www.ndltd.org/find (met verschillende suggesties) DART Europe http://www.dart-europe.eu/basic-search.php Narcis http://www.narcis.nl/search/coll/publication/genre/doctoralthesis/Language/en

32 Patenten Patenten databases
USPTO http://www.uspto.gov/patft/index.html Espace http://ep.espacenet.com/ WIPO http://www.wipo.int/pctdb/en/search-adv.jsp Patenten zoekmachines Google patent Search http://patents.google.com  Cambia patent lens http://www.patentlens.net/ (life science patenten)

33 Databases Genbank http://www.ncbi.nlm.nih.gov/Genbank/index.html
PubChem http://pubchem.ncbi.nlm.nih.gov/ UniProt http://www.ebi.ac.uk/uniprot/index.html Database issue van NAR database overzicht.

34 Wetenschappelijk nieuws
Eureka Alert http://www.eurekalert.org/index.php Science Daily http://www.sciencedaily.com/ SciCentral http://www.scicentral.com/ Scientific American http://www.sciam.com/news_directory.cfm New Scientist http://www.newscientist.com/news.ns Noorderlicht http://noorderlicht.vpro.nl/

35 Source: http://deepwebtechblog.com/the-deep-web-is-not-all-dark/

36 Oorzaken van het diepe Web
De informatie zit in databases Zoekmachine limiteringen Website limiteringen Cognitieve factoren Web 2.0 

37 Het databases probleem
Inhoud van databasese moeilijk te indexeren Zoekmachines zien een invulscherm Zoekmachines zien een “zoek” knop Database inhoud niet geoptimaliseerd voor WWW, records ranken lag Dit speelt ook met onze catalogi en repositories (Arlitsch, K., & O'Brien, P. S. (2012). Invisible institutional repositories: addressing the low indexing ratios of IRs in Google. Library Hi Tech, 30(1),

38 Zoekmachinelimiteringen
Bron: (2006)

39 Websitelimiteringen Robots.txt op de root directory
Sitemap.xml voor grote sites Gebruik van javascript File formats zoals zip, flash worden niet/nauwelijks geindexeerd Tekst files zijn niet ge-ocr’d

40 Cognitieve factoren Mensen kijken niet verder dan hun neus langs is
Bladeren niet voorbij de standaard 10 resultaten op 1e SERP

41 Web 2.0 Social media has exploded since 2005
Large social media sites (Facebook, Instagram are closed/partially closed platforms)

42 Oplossingen voor databases
Zoek databases waar je ze kunt verwachten CBS verzamelt statistieken en heft Statline, CBS in uw buurt Zoek naar databases over het onderwerp met als additionele termen woorden die naar databases verwijzen zoals: database, data, dataset, archive, bibliography, index, directory, register, zoek, search of statistics  ["plane crash" | "aviation accidents" database].


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