1,721,038 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Understanding Seismograms by Constructing Numerical Models
Get PDFStudying seismograms is the first step in the scientific study of earthquakes and the interior of the earth. Now, seismologists are generating synthetic seismograms to help explain why observed seismograms look the way they do
Interview with Donald V. Helmberger
Get PDFInterview in two sessions, May and June 1999, with Donald V. Helmberger, Smits Family Professor of Geophysics and Planetary Sciences in the Division of Geological and Planetary Sciences.
He begins by recalling his family background and childhood on a farm in Northern Minnesota, one of thirteen children. Matriculates at the University of Minnesota in 1956 (B.S. 1961). Summer work at Scripps Institution of Oceanography, 1961; sails to Alaska on a research vessel studying the structure of the oceanic crust. Transfers to UCSD for graduate work in geophysics; works at Scripps with Russell Raitt (PhD 1967). Recollections of Walter Munk and Freeman Gilbert. Two-year postdoctoral position at MIT, with Frank Press and Nafi Toksoz; introduced to seismology. Works on upper-mantle modeling, supported by U.S. Air Force in connection with underground testing of nuclear weapons. Becomes an assistant professor at Princeton in 1969; following year, joins Caltech Seismology Laboratory as assistant professor of geophysics. After 1971 San Fernando Earthquake, works on high-frequency modeling of earthquakes.
Recollections of Seismo Lab when it was on N. San Rafael Ave., in Pasadena, and of the move in 1974 to South Mudd, on Caltech campus. Memories of Charles Richter. Recalls students: Charles Langston, Thomas Heaton, Thorne Lay, Terry Wallace, Stephen Grand. Comments on Hiroo Kanamori, director of Seismo Lab 1990-1998. Discusses National Science Foundation's establishment of earthquake centers and hopes for Caltech to get the first one; Caltech loses out to SUNY Buffalo.
Succeeds Kanamori as director of the Seismo Lab in 1998. Discusses evolution of directorship since Don Anderson's tenure (1969-1989) and effects of the move to Caltech campus. Discusses Kanamori's directorship and work on TriNet. Discusses Seismo Lab's relations with U.S. Geological Survey and the CUBE program [Caltech-USGS Broadcast of Earthquakes]. Concludes by discussing his own efforts as director of the Seismo Lab and his hopes for its future
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Generalized ray theory for shear dislocations
Get PDFGeneralized ray expansions of the P, SH, and SV displacement potentials resulting from a point-source dislocation are evaluated at the surface of a layered half-space. The Cagniard-de Hoop technique is used to obtain the transient response. The results of this analysis are used to construct synthetic seismograms for a shear dislocation on a vertical fault plane. Comparisons of synthetic and observed seismograms for the Borrego Mountain earthquake (April 9, 1968) at teleseismic distances indicate an equivalent point-source depth of 9 km with the far-field time function approximated by a step function with an exponential decay. This time function fits both the P and S wave forms. The apparent shift in corner frequency between the P and S waves for shallow events, as reported by some investigators, is explained by surface reflections
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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