1,721,001 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
L'environnement des noyaux actifs de galaxies jusqu'à un redshift égal à 2
No full textCette thèse est consacrée à l'identification et l'étude des amas de galaxies à grand redshift. Nous concentrons notre analyse sur l'environnement à grande échelle de radiogalaxies lumineuses et à l'étude des galaxies de la séquence rouge et des noyaux actifs de galaxies détectés dans leur voisinage. Le travail présenté dans ce manuscrit étend d'une part les études des amas de galaxies à z2 grâce aux surdensités d'émetteurs Lyaou de galaxies à discontinuité de Lyman. Cette thèse a permisd'explorer sous de nouveaux angles, la recherche des amas à grand redshift: (i) l'étude du chaînon manquant entre z=1.4 et z=2 i.e., entre les proto-amas et amas connus à ce jour (ii) la sélection des galaxies les plus massives, membres d'un amas (i.e., les galaxies rouges de type primitif) grâce à des critères de couleur adaptés (iii) l'utilisation d'observations grand champ nécessaires à l'étude sur une plus large échelle de structures de galaxies associées aux radiogalaxies (iv) l'étude de la diversité des environnements de radiogalaxies grâce à l'analyse de plusieurs champs (v) l'étude plus spécifique de la population des noyaux actifs de galaxies dans les amas de galaxies et de son évolution en fonction du redshift. De telles études ont été rendues possible grâce à la mise en place de nouveaux instruments comme WIRCam au CFHT et HAWK-I au VLT qui permettent d'étendre l'étude des amas de galaxies à plus grand redshift et sur une plus large échelle. Nous avons étudié les champs de cinq radiogalaxies à 1.41.4). Ces critères nous ont permis desélectionner à la fois les galaxies rouges de type primitif et les galaxies plus bleues formant des étoiles. La distribution spatiale des galaxies rouges n'est pas homogène et présente souvent une structure filamentaire qui contient la radiogalaxie. Deux champs, 7C~1756+6520 (z=1.42) et MRC~0156-252 (z=2.02) sont surdenses en galaxies rouges, d'un factor 2-4 comparé à des champs de référence. Le premier champ présente une grande concentration de galaxies rouges autour de la radiogalaxie ainsi que plusieurs autres groupes alignés formant une structure filamentaire étendue sur plusieurs Mpc. Le deuxième champ présente un système plus compact de galaxies rouges et bleues concentrées à moins de 1Mpc de la radiogalaxie. Une campagne de spectroscopie a permis de confirmer que notre structure associée à 7C~1756+6520 est en effet un amas de galaxies. 20 galaxies ontété trouvées à un redshift consistent avec celui de la radiogalaxie. Nous avons ainsi montré que, bien que toutes les radiogalaxies ne se situent pas dans des champs surdenses - au moins en ce qui concerne les galaxies rouges -elles ont été toutefois un outil efficace pour la recherche d'amas de galaxies à grand redshift avec la découverte du deuxième amas le plus distant à ce jour à z=1.42 et la mise en évidence d'un possible amas de galaxies à z~2.This thesis aims to identify and characterise the most distant galaxy clusters by targeting red sequence galaxies and active galactic nuclei in the wide area environment of distant radio galaxies. This study complements both the lower redshift cluster searches which have identified clusters out to z=1.45 using optical and X-ray selections and the work on protoclusters around z>2 radio galaxies using the Lya emitters and Lyman break techniques. The new aspects of the work presented in this thesis are: (i) the study of the missing link between clusters and protoclusters known to date bythe investigation of the less studied redshift range 1.41.4) to select both red passively evolved and blue star-forming galaxy cluster candidates. The spatial distribution of the red galaxies is clearly non homogeneous and often present a filamentary structure containing the radio galaxies. We found that two of our studied fields, 7C~1756+6520 at z=1.42 and MRC~0156-252 at z=2.02, show overdensities of a factor of 2-4 in red sources compared to control fields. The first field shows a high concentration of red galaxies around the radio galaxy and several other aligned clumps forming a large scale filamentary structure of several Mpc. The second field demonstrates a more compact system of both blue and red galaxies concentrated within 1Mpc of the radio galaxy. A spectroscopy campaign confirmed that our suspected structure around 7C~1756-6520 isindeed a galaxy cluster with 20 galaxies found with redshifts consistent with the radio galaxy. We therefore conclude that although not all radio galaxies are found in overdense regions - at least as far as the red population is concerned - they are however a very efficient tool to search for high redshift galaxy clusters with the discovery in this thesis of the second most distant galaxy cluster to date at z=1.42 and a galaxy cluster candidate at z~2
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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