1,720,987 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
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
Génération d’impulsions ultracourtes dans le moyen-infrarouge
No full textLa génération d'impulsions ultra-brèves dans le moyen-infrarouge à fort taux de répétition possède un grand intérêt pour des applications telles que la spectroscopie 2D moléculaire car elle permet d'augmenter très significativement le rapport signal à bruit. Dans ce cadre, ce manuscrit relate une étude sur la génération d'impulsions ultracourtes dans le moyen-infrarouge sur une plage de longueurs d'onde s'étalant de 3,5 à 11 μm. Les différentes architectures proposées reposent sur le processus non-linéaire de génération par différence de fréquence (DFG). Dans un premier temps, une génération dite "intra-impulsion" (intraDFG) est mise en œuvre en comprimant des impulsions en sortie d'un amplificateur à fibre dopée Ytterbium, par la suite envoyées dans un cristal non-linéaire. Cette méthode est un moyen particulièrement simple et efficace de générer un rayonnement large bande dans le moyen-infrarouge intrinsèquement stable en phase enveloppe-porteuse, avec un recouvrement spatio-temporel intrinsèque des composantes spectrales au cours de leur propagation dans le cristal. Ensuite, la génération en ligne est améliorée en étirant négativement les impulsions de pompe, en optimisant de manière indépendante le recouvrement temporel des composantes spectrales en jeu et en insérant une lame bichromatique (BWP) permettant d'augmenter le nombre de photons participant à l'interaction, améliorant l'énergie générée d'un facteur 5. Un dispositif d'échantillonnage électro-optique est mis au point afin de caractériser temporellement les impulsions, démontrant des durées pouvant atteindre 49 fs à 8 μm, correspondant à 1,7 cycles optiques. Par la suite, deux architectures d'amplification paramétrique (OPA) des impulsions moyen-infrarouge sont réalisées en recyclant les photons de signal préalablement amplifiés en sortie de l'étage d'intraDFG, d'abord dans une configuration utilisant une ligne à retard, puis dans une configuration préservant le caractère en ligne de la génération. Des impulsions de 1 μJ, 84 fs à des taux de répétition de 250 kHz sont alors obtenues, augmentant de plus d'un ordre de grandeur l'efficacité globale par rapport à l'état de l'art pour ces techniques. Enfin, une source basée sur une architecture standard de DFG "inter-impulsion" est construite pour établir un point de référence en spectroscopie 2D moléculaire. En particulier, l'étude des propriétés de stabilité en intensité montre des stabilités RMS entre 0,4% et 11% pour l'intraDFG et de 0,6% à 1,9% pour l'interDFG sur l'ensemble de leur plage d'accordabilité.The generation of ultrashort pulses in the mid-infrared region at high repetition rates is of great interest for applications such as 2D molecular spectroscopy, as it allows very significant increase of the signal-to-noise ratio. In this context, this manuscript reports on a study of the generation of ultrashort pulses in the mid-infrared over a wavelength range extending from 3.5 to 11 μm. The different proposed architectures are based on the nonlinear process of difference-frequency generation (DFG). Initially, a so-called "intra-pulse" generation (intraDFG) is implemented by nonlinearly compressing pulses at the output of a Ytterbium-doped fiber amplifier, which are then sent into a nonlinear crystal. This method is a particularly simple and efficient way to generate a broadband radiation in the mid-infrared that is intrinsically stable in carrier-envelope phase, with an built-in spatiotemporal overlap of the spectral components during their propagation in the crystal. Next, this process is improved by negatively stretching the pump pulses, independently optimizing the temporal overlap of the spectral components involved and inserting a bichromatic waveplate (BWP) to increase the number of photons enrolled in the interaction, resulting in a 5-fold improvement in generated energy. An electro-optical sampling device is used to temporally characterize the pulses, demonstrating durations of 49 fs at 8 μm, corresponding to 1.7 optical cycles. Subsequently, two parametric amplification architectures (OPA) of mid-infrared pulses are implemented by recycling the signal photons previously amplified at the output of the intraDFG stage, first in a configuration using a delay line, then in an all-inline geometry. Pulses of 1 μJ, 84 fs at repetition rates of 250 kHz are obtained, increasing the overall efficiency by more than an order of magnitude compared to the state-of-the-art. Finally, a source based on a standard inter-pulse DFG is built to establish a reference point in 2D molecular spectroscopy. In particular, the study of intensity noise properties shows RMS stabilities between 0.4% and 11% for intraDFG and 0.6% to 1.9% for the interDFG source over their entire tunability range
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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