1,721,029 research outputs found
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
Amélioration de la sensibilité et de la stabilité d'un gyroscope à atomes froids grâce à des méthodes de contrôle en temps réel
No full textCe manuscrit présente la mise en œuvre et l'étude de nouvelles techniques expérimentales visant à améliorer les performances de l'expérience de gyroscope à atomes froids à deux axes du SYRTE. L'instrument représente l'état de l'art des gyroscopes à ondes de matière et utilise des transitions Raman stimulées pour réaliser un interféromètre à 4 impulsions. Cette géométrie permet d'obtenir une aire Sagnac de 11 cm² pour un temps d'interrogation de 800 ms. Dans cette thèse, nous détaillons un test de physique fondamentale avec le gyroscope à atomes froids qui consiste en un test de validité de l'effet Sagnac avec un interféromètre à ondes de matière. Les résultats d'une campagne expérimentale d'un an sont présentés, démontrant une amélioration de 20 fois la précision par rapport aux efforts précédents dans la mesure du facteur d'échelle du gyroscope, et correspondant à un niveau de précision de 23 ppm. En outre, ce travail traite également de deux nouvelles méthodes en temps réel pour contrôler la phase de l'interféromètre en utilisant les sauts de fréquence Raman et les sauts de position du miroir plutôt que d'utiliser le saut de phase relatif du laser Raman. Nous fournissons une description détaillée des deux méthodes et nous approfondissons les détails de leur mise en œuvre physique, qui est également caractérisée en détail. Une analyse comparative des performances de ces deux méthodes est également présentée. Ce travail ouvre la voie à la possibilité d'une compensation de phase atomique en temps réel pour tout interféromètre atomique basé sur des transitions à deux photons pour la diffraction d'ondes atomiques et en particulier lors de l'utilisation du régime de double diffraction Raman pour des applications spatiales.This manuscript presents the implementation and study of new experimental techniques to improve the performance of the SYRTE’s dual-axis cold atom gyroscope experiment. The instrument represents the state of the art of matter wave gyroscopes and uses stimulated Raman transitions to perform a 4-pulse interferometer. This geometry results in a Sagnac area of 11 cm² for 800 ms interrogation time. In this thesis, we detail a fundamental physics test with the cold-atom gyroscope which consists of a validity test of the Sagnac Effect with a matter-wave interferometer. The results from a year-long experimental campaign are presented, demonstrating a 20-fold improvement in accuracy over previous efforts in measuring the gyroscope scale factor, and corresponding to a 23 ppm accuracy level. Additionally, this work also discusses two novel real-time methods to control the phase of the interferometer using Raman frequency jumps and mirror position jumps rather than using Raman laser’s relative phase jump. We provide a thorough description of both methods and delve into the particulars of their physical implementation, which is also characterized in detail. A comparative analysis of the performance of these two methods is also presented. This work opens the path for the possibility of real time atomic phase compensation to any atom interferometer based on two photon transitions for the atomic wave diffraction and in particular when using Raman double diffraction regime for space applications
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
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
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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