1,720,959 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
Morphometric Study of Longitudinal Ridges in Long Runout Landslides on Mars, Earth, and the Moon
Get PDFLong runout landslides are hypermobile landslides ubiquitous in our solar system. The exact mechanism(s) that have to be invoked in order to explain their high velocity and exceptional travel distances over nearly horizontal surfaces has yet to be successfully determined. In this thesis I focused on the distinctive longitudinal ridges that mark the surface of long runout landslide deposits in the attempt to link these morphological features and their related internal structures to the mechanisms involved during the emplacement of such catastrophic events. I conducted a morphometric analysis of longitudinal ridges of three case studies: the Coprates Labes landslide in Valles Marineris on Mars; the El Magnifico landslide in Chile – on Earth; the Tsiolkovskiy crater landslide – on the Moon. For the first time in natural landslides, I found that the wavelength of the longitudinal ridges is consistently 2 to 3 times the thickness of the landslide deposit, in agreement with experimental work on rapid granular flows. The recurrence of the scaling relationship suggests a scale- and environment-independent mechanism. Therefore, I concluded that the existence of longitudinal ridges in long runout landslides cannot be used to infer the presence of specific lithologies forming the basal surface; nor environmental and climatic conditions at the time of landslide emplacement. Based on the agreement between the results obtained from my morphometric analysis and the laboratory experiments on rapid granular flows, I proposed that longitudinal ridges in long runout landslides are imparted by high-speed granular flow convection mechanisms. In order to ground truth such hypothesis, I conducted field work at the terrestrial El Magnifico landslide and studied the internal structures of the deposit and their relationship with the longitudinal ridges. I concluded that evidence cannot rule out a convection-style mechanism observed in laboratory experiments of granular flows but is also not equivocal in its support. I advanced an alternative hypothesis that longitudinal ridges may have formed by a mechanism that involves pattern-forming vibrations. Such proposed mechanism supports the existence of heterogeneous stress distribution and stress fluctuation within long runout landslide deposits, which are considered the hallmark of acoustic fluidization. I suggested the use of the scaling relationship between the wavelength of longitudinal ridges and the thickness of the deposit as a tool to infer the thickness of landslide deposits where its calculation is not otherwise possible using typical methods in geomorphology. I applied this novel idea to the Light Mantle landslide, Taurus-Littrow valley, at the Apollo 17 landing site: by calculating the representative wavelength of the longitudinal ridges I derived the thickness of its deposit, as it could not be derived through interpolation. I discussed the finding of my work within the context of the literature on frictional weakening in fault mechanics, on the similarity of weakening of shear zones in landslide and earthquake mechanics, and on the geomorphology of long runout landslide deposits. Following this, I defined a new framework under which the understanding of the formation mechanism of long runout landslides should be approached. Finally, I identified four possible directions for future work: extending the morphometric analysis of longitudinal ridges in martian double layer ejecta; investigating the importance of the roughness of the substrate in the formation of longitudinal ridges; performing friction experiments to study weakening mechanisms in lunar rock analogues; using martian long runout landslide deposits as stratigraphic markers in order to constrain the timing of geological processes
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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