1,721,508 research outputs found
Electron and positron production in 14.6 A · GeV/c nucleus-nucleus collisions
No full textThesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.by Kevin David Rathbun.B.S
Silencing, heterochromatin, and DNA double strand break repair in Saccharomyces cerevisiae
Get PDFThesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Biology, 1999.Includes bibliographical references.by Kevin David Mills.Ph.D
A synthesis towards virantmycin / by Kevin David Raner
No full textBibliography: leaves 181-187187 leaves ; 30 cm.Thesis (Ph.D.)--University of Adelaide, Dept. of Organic Chemistry, 198
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
Vibrational spectroscopy of elastomers
No full textThe application of NIR FT-Raman spectroscopy in the field of elastomers has been studied. The use of a near infra-red excitation source dramatically reduces the incidence of fluorescence, allowing commercially realistic samples to be examined. A wide range of raw elastomers, including numerous grades of Malaysian natural rubber, has been examined. In the case of polybutadiene and its copolymers, isometric ratios have been measured. Quantification has been carried out for styrene and nitrile contents in styrene-butadiene and nitrile butadiene rubbers respectively. Sulphur, in the two forms used in the elastomer industry, has been examined and transitions between these forms (insoluble, polymeric sulphur and soluble, rhombic sulphur) have been observed. The application of FT-Raman to the quantification of insoluble sulphur has been demonstrated along with a method for the determination of sulphur solubility in elastomers. Polymer chain modifications resulting from vulcanization have been studied in natural rubber and polybutadiene with bands assigned to conjugated diene and triene structures. The relationship between the degree of modification and the vulcanizing system used has also been demonstrated. The study of vulcanization in ethylene propylene diene monomer rubbers has shown that crosslinks can be detected by the shift induced in the ϑc = c band position. A study of the interactions between 2-mercaptobenzothiazole, sulphur and zinc oxide in several matrices under vulcanization conditions has provided information on the chemistry of vulcanization prior to the actual creation of sulphur crosslinks.</p
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
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
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