Employing a citation analysis, this study explored and compared the bibliometric characteristics and the subject relationship with other disciplines of and among the three leading information science journals, Journal of the American Society for Information Science and Technology (JASIST), Information Processing and Management and Journal of Documentation. The citation data were drawn from references of each article of the three journals during 1998 and 2008. The Ulrich's Periodical Directory, Library of Congress Subject Heading, retrieved from the WorldCat, and LISA database were used to identify the main class, subclass and subject of cited journals and books. Quantitative results on the number of JASIST, IPM and JOD literature references, average number of references cited per paper, document type of cited literature and the journal self-citation rate are reported. Moreover, the highly cited journals and books, the main classes and subclasses of cited journals and books in papers of the three journals, the highly cited subjects in journals and books of library and information science were identified and analyzed. Comparison on the characteristics of cited journals and books confirmed that all the three journals under study are information science oriented, except JOD which is library science orientation. JASIST and IPM are very much in common and diffuse to other disciplines more deeply than JOD.
The present study explores the characteristics of hydrogen energy literature from 1965 to 2005 based on the database of Science
Citation Index Expanded (SCIE) and its implication using the bibliometric techniques. The results of this work reveal that
the literature on hydrogen energy grows exponentially with an annual growth rate of about 18% for the last decade. Most of
document type is in the form of journal articles or meeting abstracts, constituting 90.17% of the total literature and English
is the predominant language (94.66%). USA, Japan and China are the three biggest contributing countries on hydrogen energy
literature publishing, 25.8%, 14.9%, 7.7%, respectively. The Chinese Academy of Sciences in China is the largest contributor
publishing 308 papers. The journal literature on hydrogen energy does not confirm the typical S-shape for the Bradford-Zipf
plot, but five core journals, i.e. International Journal of Hydrogen Energy, Journal of Power Source, Journal of the Electrochemical Society, Solid State Ionics,
and Electrochimica Act, contributing about 41% can be identified. Journals with highly cited articles and most highly cited articles are also identified,
in which the most highly cited article receives more than 1,000 citations.
By employing the Pearson correlation, Fisher-and t-tests, the present study analyzes and compares scientometric data including
number of source items, number of citations, impact factor, immediacy index, citing half-life and cited half-life, for essential
journals in physics, chemistry and engineering, from SCI JCR on the Web 2002. The results of the study reveal that for all
the scientometric indicators, except the cited half-life, there is no significant mean difference between physics and chemistry
subjects indicating similar citation behavior among the scientists. There is no significant mean difference in the citing
half-life among the three subjects. Significant mean difference is generally observed for most of the scientometric indicators
between engineering and physics (or chemistry) demonstrating the difference in citation behavior among engineering researchers
and scientists in physics or chemistry.
Significant correlations among number of source items, number of citations, impact factor, and immediacy index and between
cited half-life and citing half-life generally prevail for each of the three subjects. On the contrary, in general, there
is no significant correlation between the cited half-life and other scientometric indicators. The three subjects present the
same strength of the correlations between number of source items and number of citations, between number of citations and
impact factor, and between cited half-life and citing half-life.
This study investigates Ted Nelson’s works and the influence of his hypertext concept through citation analysis, including
citation counting, characteristics of citing articles on language, document type, citing year, discipline, and citation content.
The selection of the Nelson’s works was based on searching Library Literature & Information Science, Library and Information
Science Abstracts, Google and Yahoo search engines. The citation data were compiled from the database of Web of Science. The
results of the study reveal that hypertext has directly great impact on information retrieval and world wide web; therefore,
the concept has had profound influence on information, library and computer science disciplines. Moreover, the influence of
Nelson’s works spreads to other disciplines variously, especially on education, literature, business and economics, engineering,
sociology, psychology, etc. The citation context analysis of citing articles on information and library science reveals that
(1) definition, orientation and general introduction of hypertext; (2) relation of Vannevar Bush and Ted Nelson in terms of
hypertext; (3) Nelson’s Xanadu system and its component of hypertext; (4) the application of hypertext in information science
and library science are four most citing purpose.
Summary The purpose of this study is to analyze and compare journal citation data, from Journal Citation Reports on the Web 2000, of general and internal medicine and surgery. The source items and five kinds of citation data, i.e. citation counts, impact factor, immediacy index, citing half-life and cited half-life are examined and the correlation between each of the fifteen pairs of citation data is determined based on the Pearson correlation tests. The Fisher’s Z-transform was employed to test the significant difference between the Pearson correlation coefficient for each pair of citation data of these two subject areas. The following results of this work reveal: the frequently published journals are cited more frequently and also with high impact factor and immediacy index, in addition, they are usually accompanied with short citing half-life (i.e., usually cite current literature). The impact factor and immediacy index has significant correlation with citation counts. A significant correlation also exists between impact factor and immediacy index. However there is no correlation between cited half-life and other citation data, except citing half-life. For journals of general and internal medicine and surgical medicine, there are no significant difference of the Pearson correlation coefficient for the following pair of citation data: source items and citation counts, source items and impact factor, source items and citing half-life, citation counts and citing half-life, impact factor and citing half-life, immediacy index and citing half-life, and cited half-life and citing half-life.
The purpose of this study is to map semiconductor literature using journal co-citation analysis. The journal sample was gathered
from the INSPEC database from 1978 to 1997. In the co-citation analysis, the data compiled were counts of the number of times
two journal titles were jointly cited in later publications. It is assumed that the more two journals are cited together,
the closer the relationship between them. The journal set used was the 30 most productive journals in the field of semiconductors.
Counts of co-citations to the set of semiconductor journals were retrieved from SciSearch database, accessed through Dialog.
Cluster analysis and multi-dimensional scaling were employed to create two-dimensional maps of journal relationships in the
cross-citation networks. The following results were obtained through this co-citation study: The 30 journals fall fairly clearly
into three clusters. The major cluster of journals, containing 17 titles, is in the subject of physics. The second cluster,
consisting of 9 journals, includes journals primarily on material science. The remaining cluster represents research areas
in the discipline of electrical and electronic engineering. All co-cited journals share similar co-citation profiles, reflected
in high positive Pearson correlation. Two hundred and ninety-six pairs (68%) correlate at greater than 0.70. This shows that
there is strong relationship between semiconductor journals. Five individual journals in five paired sets with co-citation
frequency over 100,000 times include Physical Review B, Condensed Matter; Physical Review Letters; Applied Physics Letters; Journal of Applied Physics; and Solid State Communications.
The purpose of this study is to map semiconductor literature by author co-citation analysis in order to highlight major subject
specializations in semiconductors and identify authors and their relationships within these specialties and within the field.
Forty-six of the most productive authors were included in the sample list. Author samples were gathered from the INSPEC database
from 1978 to 1997. The relatively low author co-citation frequencies indicate that there is a low connection among authors
who publish in semiconductor journals and big differences among authors' research areas. Six sets of authors with co-citation
greater than 100 times are M. Cardona and G. Lucovsky; T. Ito and K. Kobayashi; M. Cardona and G. Abstreiter; A. Y. Cho and
H. Morkoc; C. R. Abernathy and W. S. Hobson; H. Morkoc and I. Akasaki. The Pearson correlation coefficient of author co-citation
varies widely, i.e., from -0.17 to 0.92. This shows that some authors with high positive correlations are related in certain
ways and co-cited, while other authors with high negative correlations may be rarely or never related and co-cited. Cluster
analysis and multi-dimensional scaling are employed to create two-dimensional maps of author relationships in the cross-citation
networks. It is found that the authors fall fairly clearly into three clusters. The first cluster covers authors in physics
and its applications. The authors in the second group are experts in electrical and electronic engineering. The third group
includes specialists in materials science. Because of its interdisciplinary nature and diverse subjects, semiconductor literature
lacks a strong group of core authors. The field consists of several specialties around a weak center.