1,720,955 research outputs found
Detachments and mass transports along low-angle slopes: the onset of the Tithonian carbonate ramp progradation along the Eastern Sardinia Jurassic passive margin (Italy)
No full textCarbonate megabreccias associated with submarine unconformities are documented on several passive margin slopes and, recently, they have been recognized on carbonate platform marginal slopes. Their depositional architecture and regional correlation are poorly described in the geological record, due to the lack of well-exposed outcrops. The geodynamic and stratigraphic evolution of the Tithonian (Late Jurassic) Southern European passive margin was characterized by frequent mass transport events with the deposition of carbonate megabreccias and the development of large-scale submarine unconformities with different genetic interpretations.
This study investigates the depositional facies and stratigraphic architecture of upper Tithonian carbonate megabreccias, which were deposited on top of a laterally continuous, submarine erosional unconformity. This unconformity overlies outer ramp calci-mudstones (Pedra Longa Fm., up to 30 m thick), accumulated in a protected intraplatform basin (Baunei Basin) following an early Tithonian transgression. These calci-mudstones are partly coeval and separate two progradational eastward gently dipping carbonate ramp systems (Mt. Tului and Mt. Bardia Fms). The studied megabreccias are likely associated with a regressive trend marked by the sharp contact between the thin-bedded Pedra Longa strata and massive shallow-water coarse-grained Mt. Bardia Fm. carbonates.
The erosional unconformity is documented over an area exceeding 6.5 x 2.5 km and it is characterized by a gentle incision in the most proximal part of the basin, while basinward (eastward) it comprises narrow (3-6 m wide) and 2-4 m deep, erosional incisions filled by thick chaotic megabreccia lenses (up to 20 m thick). The macro and microfacies of these breccias include both clasts and matrix deriving from prevalent shallow-water inner ramp, lagoonal oo-bioclastic grainstones/packstones and Pedra Longa Fm. intraformational calci-mudstones. Minor erosional events, with prevalent intraformational coarse to fine grained breccia lenses and slumping, are locally present in the lower Pedra Longa Fm... Locally, the amalgamation of the upper unconformity (main stratigraphic event) with the underlying local erosional surfaces can remove almost all the Pedra Longa succession (thickness reduced to a few metres). In these locations, the submarine erosions and the top unconformity present more differentiated features: strata-bound erosional surfaces, soft sediment deformations, intra-formational breccia pockets or a sharp boundary without mass transport events.
The possible mechanisms for the megabreccia emplacement include: 1) catastrophic mass transport due to liquefaction processes, failures of shallow-water carbonate sands, along an intraplatform gentle slope, during fast carbonate progradation (sea level lowering associated to tsunami events, and/or tectonic block tilting along the Baunei Basin); 2) polyphasic amalgamated mass transport events related to the fast basinward progradation of proximal ramp carbonates with frequent gravitational failures of marginal oo-bioclastic shoals, and lithified patch reef boulders above still poorly consolidated marly calci-mudstones. Regardless the dominant processes, the lateral continuity of the unconformity, the deposition of megabreccias and their landward correlation with sedimentary dikes and polygenic carbonate megabreccias lenses, cropping outside the Baunei Basin, might be consistent with a syn-sedimentary tectonic control
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
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