1,721,051 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
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
Les céphéides à haute résolution angulaire : enveloppe circumstellaire et pulsation
No full textSince more than a century, the period-luminosity relation of Cepheid stars is a funda- mental step of the cosmological distance ladder. However, the distance estimates from this law are only accurate to ∼ 5 % and this uncertainty is mainly due to its calibration. The enhancement of this calibration requires an accurate and independent determination of the distances of a sample of nearby Cepheids. Until recently, Cepheids were considered as devoid of circumstellar material. In 2005, interferometric observations with VLTI/VINCI and CHARA/FLUOR revealed the existence of a circumstellar envelope (CSE) around some Cepheids. This surrounding material is particularly interesting for two reasons : it could have an impact on the distance estimates and could be linked to a past or on-going mass loss. The use of Baade-Wesselink methods for independent distance determinations could be significantly biased by the presence of these envelopes. Although their observations are difficult because of the high contrast between the photo- sphere of the star and the CSE, several observation techniques have the potential to improve our knowledge about their physical properties. In this thesis, I discuss in particular high angular resolution techniques that I applied to the study of several bright Galactic Cepheids. First, I used adaptive optic observations with NACO of the Cepheid RS Puppis, combined with an observing mode called "cube", in order to deduce the flux ratio between the CSE and the photosphere of the star in two narrow bands of central wavelength λ = 2.18 μm et λ = 1.64 μm. In addition, thanks to the cube mode, I could carry out a statistical study of the speckle noise and inspect a possible asymmetry. Secondly, I analysed VISIR data to study the spectral energy distribution of a sample of Cepheids. These diffraction-limited images enabled me to carry out an accurate photometry in the N band and to detect an IR excess linked to the presence of a circumstellar component. On the other hand, applying a Fourier analysis I showed that some components are resolved. I then explored the K′ band with the recombination instrument FLUOR for some bright Cepheids. Thanks to new set of data of Y Oph, I improved the study of its circumstellar envelope. Using a ring-like model for the CSE, I assessed an angular size of 4.54 ± 1.13 mas and an optical depth of 0.011 ± 0.006. For two other Cepheids, U Vul and S Sge, I applied the interferometric Baade-Wesselink method in order to estimate their distance. I found d = 647 ± 45 pc and d = 661 ± 57 pc , respectively for U Vul and S Sge, as well as a linear radii R = 53.4 ± 3.7 R⊙ and R = 57.5 ± 4.9 R⊙ respectively.Depuis plus d'un siècle, la relation période-luminosité (P-L) des étoiles Céphéides est un échelon fondamentale de l'échelle des distances cosmologiques. Cependant, l'estimation des distances à partir de cette loi n'est précise qu'à ∼ 5 % et cette incertitude est principalement due à son étalonnage. L'amélioration de cet étalonnage nécessite une détermination précise (de manière indépendante de la relation P-L) de la distance des Céphéides proches. Jusqu'à récemment, les Céphéides étaient considérées comme dépourvues de matériel circumstellaire. En 2005, des observations interférométriques VLTI/VINCI et CHARA/FLUOR ont révélé l'existence d'enveloppe circumstellaire autour de certaines Céphéides. Ce ma- tériel environnant est particulièrement intéressant pour deux raisons : il pourrait avoir un impact sur l'estimation des distances et pourrait être lié à une perte de masse passée ou en cours. L'utilisation de la méthode de Baade-Wesselink classique pour la détermination indépendante des distance pourrait être significativement biaisée par la présence de ces enveloppes. Bien que leurs observations soient difficiles à cause du fort contraste entre la photosphère de l'étoile et l'enveloppe circumstellaire, plusieurs techniques d'observations ont le potentiel d'améliorer notre connaissance sur leurs propriétés physiques. Dans ce manuscrit, je discute en particulier des techniques de haute résolution angulaire que j'ai appliqué pour l'étude de plusieurs Céphéides Galactiques. Dans un premier temps j'ai utilisé des observations de la Céphéide RS Puppis en imagerie par optique adaptative avec NACO, couplée à un mode d'observation dit "cube", pour déduire le rapport de flux entre l'enveloppe et la photosphère de l'étoile dans deux bandes étroites centrées sur λ = 2.18 μm et λ = 1.64 μm. De plus grâce au mode cube, j'ai également pu effectuer une étude statistique du bruit de speckle me permettant d'étudier une éventuelle asymétrie. Dans un second temps, j'ai analysé des données VISIR pour étudier la distribution d'éner- gie spectrale d'un échantillon de Céphéides. Ces images, qui sont limitées par la diffraction, m'ont permis d'effectuer une photométrie précise dans la bande N et de mettre en évi- dence un excès infrarouge lié à la présence d'une composante circumstellaire. D'autre part en appliquant une analyse de Fourier j'ai montré que certaines de ces composantes sont résolues. J'ai ensuite exploré la bande K′ avec l'instrument de recombinaison FLUOR pour certaines Céphéides brillantes. Grâce à de nouvelles données sur l'étoile Y Oph, j'ai approfondi l'étude de son enveloppe circumstellaire. En utilisant un modèle d'étoile entourée d'une couronne sphérique, j'ai déterminé une taille angulaire de 4.54 ± 1.13 mas et une profondeur optique de 0.011 ± 0.006. Pour deux autres Céphéides, U Vul et S Sge, j'ai appliqué la méthode de Baade-Wesselink afin d'estimer une première mesure directe de leur distance. J'ai trouvé unedistanceded = 647 ± 45pcetd = 661 ± 57pc,respectivementpourUVuletSSge,ainsi qu'un rayon linéaire moyen R = 53.4 ± 3.7 R⊙ et R = 57.5 ± 4.9 R⊙ respectivement
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