1,721,441 research outputs found

    Data report: Composite depths and spliced sections for Leg 178 Sites 1095 and 1096, Antarctic Peninsula continental rise

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    During Leg 178, multiple advanced piston corer holes were drilled at our sites (1095, 1096, 1098, and 1099). Cores from the holes were correlated on board to produce composite depths and optimal spliced sections, but the time limitations aboard ship caused these to be preliminary. Recomputed composite depths for Sites 1098 and 1099 in Palmer Deep are reported elsewhere in this volume. This paper reports recomputed composite depths and spliced sections for Sites 1095 and 1096, located on a sediment drift on the continental rise of the Pacific margin of the Antarctic Peninsula. Limits on the validity of the spliced sections arise from limited multiple coverage and possibly from the effects of ocean swell

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The 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

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    “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

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    We 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

    Magnetic resonance spectroscopy in epilepsy

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    Key points \ud • The clinical aims of MR spectroscopy (MRS) in \ud seizure disorders are to help identify, localize \ud and characterize epileptogeic foci. \ud • Lateralizing MRS abnormalities in temporal lobe \ud epilepsy (TLE) may be used clinically in combi- \ud nation with structural and T2measurements. \ud • Characteristic metabolite abnormalities are \ud decreased N-acetylaspartate (NAA) with \ud increased choline (Cho) and myoinositol (mI) \ud (short-echo time). \ud • Contralateral metabolite abnormalities are \ud frequently seen in TLE, but are of uncertain \ud significance. \ud • In extra-temporal epilepsy, metabolite abnor- \ud malities may be seen where MR imaging (MRI) \ud is normal; but may not be sufficiently local- \ud ized to be useful clinically. \ud • MRS may help to characterize epileptogenic \ud lesions visible on MRI (aggressive vs. indolent \ud neoplastic, dysplasia). \ud • Spectral editing techniques are required to \ud evaluate specific epilepsy-relevant metabolites \ud (e.g. -aminobutyric acid (GABA)) which may \ud be useful in drug development and evaluation. \ud • MRS with phosphorus (31P) and other nucleii \ud probe metabolism of epilepsy, but are less \ud useful clinically

    Dispelling the Myths Behind First-author Citation Counts

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    We 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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