In this paper we report on the results of an exploratory study of knowledge exchange between disciplines and subfields of
science, based on bibliometric methods. The goal of this analysis is twofold. Firstly, we consider knowledge exchange between
disciplines at a global level, by analysing cross-disciplinary citations in journal articles, based on the world publication
output in 1999. Among others a central position of the Basic Life Sciences within the Life Sciences and of Physics within
the Exact Sciences is shown. Limitations of analyses of interdisciplinary impact at the journal level are discussed. A second
topic is a discussion of measures which may be used to quantify the rate of knowledge transfer between fields and the importance
of work in a given field or for other disciplines. Two measures are applied, which appear to be proper indicators of impact
of research on other fields. These indicators of interdisciplinary impact may be applied at other institutional levels as
Highly cited articles are interesting because of the potential association between high citation counts and high quality research.
This study investigates the 82 most highly cited Information Science and Library Science’ (IS&LS) articles (the top 0.1%)
in the Web of Science from the perspectives of disciplinarity, annual citation patterns, and first author citation profiles.
First, the relative frequency of these 82 articles was much lower for articles solely in IS&LS than for those in IS&LS and
at least one other subject, suggesting that that the promotion of interdisciplinary research in IS&LS may be conducive to
improving research quality. Second, two thirds of the first authors had an h-index in IS&LS of less than eight, show that
much significant research is produced by researchers without a high overall IS&LS research productivity. Third, there is a
moderate correlation (0.46) between citation ranking and the number of years between peak year and year of publication. This
indicates that high quality ideas and methods in IS&LS often are deployed many years after being published.
For practical reasons, bibliographic databases can only contain a subset of the scientific literature. The ISI citation databases
are designed to cover the highest impact scientific research journals as well as a few other sources chosen by the Institute
for Scientific Information (ISI). Google Scholar also contains citation information, but includes a less quality controlled
collection of publications from different types of web documents. We define Google Scholar unique citations as those retrieved by Google Scholar which are not in the ISI database. We took a sample of 882 articles from 39 open access
ISI-indexed journals in 2001 from biology, chemistry, physics and computing and classified the type, language, publication
year and accessibility of the Google Scholar unique citing sources. The majority of Google Scholar unique citations (70%)
were from full-text sources and there were large disciplinary differences between types of citing documents, suggesting that
a wide range of non-ISI citing sources, especially from non-journal documents, are accessible by Google Scholar. This might
be considered to be an advantage of Google Scholar, since it could be useful for citation tracking in a wider range of open
access scholarly documents and to give a broader type of citation impact. An important corollary from our study is that Google
Scholar’s wider coverage of Open Access (OA) web documents is likely to give a boost to the impact of OA research and the
A survey of linguistic dimensions of Web site hosting and interlinking of the universities of sixteen European countries is
described. The results show that English is the dominant language both for linking pages and for all pages. In a typical country
approximately half the pages were in English and half in one or more national languages. Normalised interlinking patterns
showed three trends: 1) international interlinking throughout Europe in English, and additionally in Swedish in Scandinavia;
2) linking between countries sharing a common language, and 3) countries extensively hosting international links in their
own major languages. This provides evidence for the multilingual character of academic use of the Web in Western Europe, at
least outside the UK and Eire. Evidence was found that Greece was significantly linguistically isolated from the rest of the
EU but that outsiders Norway and Switzerland were not.
Authors:Mike Thelwall, Franz Barjak, and Hildrun Kretschmer
inequalities are prevalent in science despite many initiatives to try to
eradicate them. Given the deep-rooted and complex nature of these inequalities
there is a continuing need for research into their causes and manifestations.
This study analyses one aspect of web communication, hyperlinks, to explore
whether they are a potential source of insights into gender differences in this
important scientific communication medium. A study of links to life sciences
research groups in nine European found little evidence of gender differences,
except in Germany. As a consequence, it is argued that hyperlinks are not a
promising source of quantitative information about gender differences in
communication strategies or online visibility, at least for senior researchers
or research groups.
Authors:Xuemei Li, Mike Thelwall, and Dean Giustini
This paper investigates whether CiteULike and Mendeley are useful for measuring scholarly influence, using a sample of 1,613 papers published in Nature and Science in 2007. Traditional citation counts from the Web of Science (WoS) were used as benchmarks to compare with the number of users who bookmarked the articles in one of the two free online reference manager sites. Statistically significant correlations were found between the user counts and the corresponding WoS citation counts, suggesting that this type of influence is related in some way to traditional citation-based scholarly impact but the number of users of these systems seems to be still too small for them to challenge traditional citation indexes.
Authors:Xuemei Li, Mike Thelwall, Peter Musgrove, and David Wilkinson
Previous research has shown that Web link based metrics can correlate with traditional research assessment at the university
level. In this study, we test whether the same is true for the computer science departments in the UK. The relevant Web Impact
Factors (WIFs) were calculated from the link data collected both from AltaVista and the special academic crawler of the University
of Wolverhampton. The numbers of staff members and Web pages in each computer science department were used as denominators
for the WIFs calculation. The number of inlinks to the computer science departments correlated significantly with their research
productivities, and WIFs with numbers of staff members as denominators correlated significantly with their Research Assessment
Exercise (RAE) ratings. The number of staff members was confirmed to be a better indicator of departmental size than the number
of Web pages within the department's domain.
Authors:Xuemei Li, Mike Thelwall, David Wilkinson, and Peter Musgrove
Although many link patterns have been identified at the university level, departmental interlinking has been relatively ignored.
Universities are multidisciplinary by nature and various disciplines may employ the Web differently, thus patterns identified
at the university level may hide subject differences. Departments are typically subject-oriented, and departmental interlinking
may therefore illustrate interesting disciplinary linking patterns, perhaps relating to informal scholarly communication.
The aim of this paper is to identify whether and how link patterns differ along country and disciplinary lines between similar
disciplines and similar countries. Physics, Chemistry and Biology departments in Australia, Canada and the UK have been chosen.
In order to get a holistic picture of departments' Web use profiles and link patterns, five different perspectives are identified
and compared for each set of departments. Differences in link patterns are identified along both national and disciplinary
lines, and are found to reflect offline phenomena. Along national lines, a likely explanation for the difference is that countries
with better research performances make more general use of the Web; and, with respect to international peer interlinking,
countries that share more scholarly communication tend to interlink more with each other. Along disciplinary lines, it seems
that departments from disciplines which are more willing to distribute their research outputs tend to make more general use
of the Web, and also interlink more with their national and international peers.
Authors:Peter Musgrove, Ray Binns, Teresa Page-Kennedy, and Mike Thelwall
A technique is presented for the identification of patterns from the links between large Web spaces and is applied to data
concerning the interlinking of university Web sites in fifteen European countries. This is based upon a procedure for normalising
the data so that it can be analysed using standard multivariate statistical techniques and is less susceptible to individual
outliers than standard methods. The approach was successfully able to identify clusters of European countries based upon data
for their universities' interlinking patterns. For example, the northern countries were differentiated from the southern with
Authors:Xuemei Li, Mike Thelwall, David Wilkinson, and Peter Musgrove
The structural similarity between hyperlinks and citations has encouraged information scientists to apply bibliometric techniques
to the Web. University links have been previously validated as a new data source through significant statistical correlations
between link and research measures, together with identification of motivations for hyperlink creation at the university level.
Many investigations have been conducted for university interlinking, but few for departments. University Web sites are large
compared with departmental Web sites, and significant statistical results are more easily obtained. Nevertheless, universities
are multidisciplinary by nature and disciplines may employ the Web differently, thus patterns identified at the university
level may hide subject differences. This paper validates departmental interlinking, using Physics, Chemistry and Biology departments
from Australia, Canada and the UK.