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Issues in Science and Technology
Librarianship |
Winter 2004 |
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DOI:10.5062/F4VM497F |
URLs in this document have been updated. Links enclosed in {curly brackets} have been changed. If a replacement link was located, the new URL was added and the link is active; if a new site could not be identified, the broken link was removed. |
The value of the ADS to astronomical and astrophysical research has been widely recognised, both within the astronomical field, and by libraries. In 2001 Guenther Eichhorn, Project Scientist for ADS, received the Physics, Astronomy and Mathematics Division Award from the Special Libraries Association, and the 2001 van Biesbroeck Prize of the American Astronomical Society was awarded to Michael Kurtz, Scientist with the Harvard-Smithsonian Center for Astrophysics (ADS Awards and Recognition).
The digital library contains over 3.3 million records, which are stored in four databases:
The ADS is considerably smaller than Inspec (over 7 million), which is a major database for physics, electrical engineering and computer science. The value of the ADS is as a specialist database. It combines both astronomical literature and provides access to technical data in the field. The data in the ADS come from a wide range of resources including references and abstracts of articles from all the major journals, many minor journals, monographs, conference proceedings, observatory reports and newsletters, many NASA reports, technical information and PhD theses in the relevant fields. When compared to ISI's Journal Citation Reports, the ADS has a comprehensive coverage of the core journals for astrophysics and astronomy. For physics, approximately 80% of the journals listed by ISI Journal Citation Reports are covered by ADS. In addition to these core journals, many more journals are included.
The initial data set for the ADS came from NASA's Scientific and Technical Information section, and covered the period 1975 - 1995. Subsequently, the data were collected from journals as agreements were reached with individual journals. Additional references are also collected from SIMBAD (Set of Identifications, Measurements and Bibliographies for Astronomical Data), NED (NASA/IPAC Extragalactic Database), conference editors, and individual authors. The ADS is tightly connected with the major journals in astronomy and the major astronomy data centres. In order to provide complete bibliographic coverage, electronic records have been created from table of contents of most journals and conference series back to the first volume. Data is continuously added to the databases, and the web site is updated weekly.
To improve access for all users, the digital library is available on 12 mirror sites around the world, including sites in the USA, South America (Argentina, Brazil and Chile), Europe (France, Germany, Great Britain and Russia), and Asia (China, India, Korea, and Japan).
The ADS is well used by researchers in astronomy and astrophysics. From the table below, it can be seen that this database is increasingly heavily used.
Date | No. of users | No. of queries | No. of references retrieved | No. of articles read |
---|---|---|---|---|
March 19991 | 20,000 | 580,000 | 10,000,000 | 110,000 |
March 20012 | 50,000 | 800,000 | 28,000,000 | 130,000 |
May 20023 | 60,000 | 1,000,000 | 40,000,000 | 300,000 |
Sources of information: 1 Kurtz et al. 2000 2 Eichhorn et al. 2002b 3 Eichhorn et al. 2002a |
There has been a policy of obtaining permission to scan early articles. Permission to do this has been obtained from 40 journals, and for most of these journals scanned articles are available back to the first volume. There are also many observatory reports available in the scanned journals. Many of the scanned images of older journals and observatory reports date to the 1800s.
Help is available through a Help button on each screen. There is also help in context on many of the search screens.
e.g. ^drinkwater, j will find papers with J Drinkwater as the first author drinkwater, j$ will find papers with J Drinkwater as the last author ^ drinkwater, j$ will find papers with J Drinkwater as the only author.
Two forms of logic are available. Simple Logic allows the use of "+" or "-" in front of a word to indicate its inclusion or exclusion. Many users would be familiar with this form of searching because it is used by search engines such as Google. Boolean logic is also available and can be used for more complex searches.
Two truncation characters are used in the database. The "*" replaces zero or more characters, and the "?", which can be used within a word, replaces single characters. The "*" cannot be used within a word, but it can be used at the beginning or end of a word e.g. *sorb will find absorb or adsorb.
It is possible to limit your search in a number of ways.
On the search screen there is a link to "Journal/Volume/Page" "Current Journals" or "Unread Journals". The "Current Journals" takes you to the current issue of selected journals, and the "Unread Journals" takes you to those current journals you have not read. You can select which journals you want to read through the "Preferences Settings Form". Cookies are used to monitor your preferences and ensure that you only see those journals when next you visit the site.
The journal/Volume/Page service allows you to search individual journals. If you want to know which journals are available, you can follow the link and then select from all journals (includes Observatory bulletins and circulars), all conferences (includes NASA reports and books), refereed journals or non-refereed journals.
The scanned article service gives the choice of:
Information on citing articles from ADS is now being included in the "Articles Citing this Article" tool in the Institute of Physics electronic journals (Pearce 2003).
Recognition of the value of this database has come from both the library and information industry and the research and academic community. The Institute of Physics is linked to part of the information in this database, which will give the database wider exposure and recognition.
In the time I have been reviewing this database, I have worked through a network connection and a modem connection. While the network connection is better, the speed of the modem connection has been good. Using mirror sites helps spread the load, and makes the database more responsive.
My overall impression of this database is that it is a good database, giving comprehensive coverage of astronomy and astrophysics. It is easy to use, and has a number of sophisticated features to enhance the search interface.
Eichhorn, G., et al. 2002a. Access to the Astronomical Literature through the NASA Astrophysics Data System from Developing Countries. In Library and Information Services in Astronomy IV, (ed. By B. Corbin, E. Bryson, and M. Wolf). [Online]. Available: {http://www.eso.org/sci/libraries/lisa4/Eichhorn1.pdf} [September 25 2003].
Eichhorn, G., et al. 2002b. The NASA Astrophysics Data System: free access to the astronomical literature on-line and through email. Astronomy and Space Science 282, 299-340.
Kurtz, M. J., Eichhorn, et al. 2000. The NASA Astrophysics Data System: overview. Astronomy & Astrophysics Supplement Series 143, 41-59.
Pearce, L. [custserv@iop.org] IOP's Forward Citing tool is enhanced (3/467). Private e-mail message, September 27 2003.
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