1,721,608 research outputs found
Dylan Walker, Ian Hawk
No full textCover for Dylan Walker, Ian Hawk, from the RISD Library Zine Collection.https://digitalcommons.risd.edu/specialcollections_zinecollection/1947/thumbnail.jp
The measurement of human plasma catecholamines by high performance liquid chromatography and electrochemical detection, and the study of sympathoadrenal responses during the induction of anaesthesia prior to surgery.
No full textA major part of this study details the technical procedures required to separate the catecholamines from their biological matrix as efficiently as possible, to detect them, and to quantify them accurately. The method is subsequently validated in detail, and reference ranges established from a small normal population. An attempt was also made to estimate the platelet catecholamine content: this was not successful, but is included here for the light it sheds on the technical problems encountered.Plasma catecholamines were measured using these methods in three different clinical situations: in patients suspected of harbouring a phaeochromocytoma, and in two separate groups of patients undergoing induction of anaesthesia prior to surgery. Because of the individual nature of these studies, the layout of this thesis is unusual: the three clinical studies are presented in their entirety in three separate chapters. Each is introduced with a background to the study and a presentation of the hypothesis being tested, and a full discussion of the results and conclusions will be found at the end of each of chapters 8, 9 and 10. In chapter 9 the catecholamine responses during induction of anaesthesia and skin incision were studied in patients undergoing coronary artery bypass grafting, either for the first time or as a review of previous grafts. In chapter 10, the catecholamine responses during the induction of anaesthesia were compared in neurosurgical patients with the use of either intravenous magnesium sulphate or intravenous alfentanil. In all of these groups of either intravenous magnesium sulphate or intravenous alfentail. In all of these groups of patients the catecholamine responses, and haemodynamic responses were found to be surprisingly small, quite unlike the marked response to intubation reported by other groups in the past, and the conclusion is drawn that this is probably a reflection of efficient, modern anaesthetic practice.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
"Manuel Álvarez Bravo, Surrealism and Documentary Photography"
Full text linkabstract: When André Breton went to Mexico in 1938, he saw the photographs of Manuel Álvarez Bravo, took a set of them back with him to France and, the following year, published and exhibited them as part of his espousal of Mexico as “the surrealistic place par excellence.” That is the first reason why the work of Álvarez Bravo cannot be overlooked in the broader context of Surrealism. This circumstance, often cited, has rarely been analyzed in any depth and part of the aim of this essay is to undertake that analysis
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Full text linkWe 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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