1,720,962 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
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
Oxide based ceramic matrix composites for high temperature aerospace sealing applications
Get PDFThis thesis looks at the viability of using oxide based ceramic matrix composites for high temperature gas turbine sealing applications. Two material systems namely Nextel312/SiOC, Nextel 312 fibre with SiOC matrix, and Nextel720/Alumina, Nextel 720 fibre with alumina matrix, were studied in detail and modified in order to produce CMC variants that could perform adequately as seals materials.
Nextel 312/SiCO composites were optimised for sealing applications at service temperatures of up to 900°C, using repeated matrix impregnation and pyrolysis (polymer infiltration processing, PIP) at different temperatures. The microstructures were analysed using SEM, TEM, XRD and X-ray computed tomography in order to quantify the differences arising from the manufacturing process. The materials were tested mechanically to determine their strength, ductility, interfacial shear strength and fracture behaviour. The thermal stability of the composites was investigated using thermo-gravimetric analysis (TGA). The objective was to identify the PIP temperature that could provide the optimum combination of properties of high elastic flexural deflection, thermal stability, low interfacial shear stress for toughening and low mass loss up to the intended service temperature. Processing at 950°C or above gave a combination of high effective elastic modulus, good resistance to mechanical damage from tensile strain and good thermal stability. The temperature capability of this material system, as studied in literature and by carrying out experiments in this piece of work, suggests that this material system would not be able to perform adequately as a seal at temperatures ≥ 900°C for extended periods, hence it was not investigated further in this study.
After identifying the key gaps in literature, an investigation was carried out that looked at the deformation and fracture of a 0/90° Nextel 720 alumina/Mullite fibre with alumina matrix ceramic-matrix composite material by in situ synchrotron X-ray computed micro-tomography at ambient temperature and at 1100°C. A three-point loading configuration was used and samples were loaded monotonically until final fracture. The flexural strength was found to be unaffected by temperature. 3D visualisation of the microstructure showed that fracture occurred by propagation of internal cracks at stresses close to the flexural strength. Shear fractures propagated across fibre bundles that were oriented perpendicular to the flexural stress at both room temperature and 1100°C. At 1100°C however, an additional failure mode of delamination was observed, in the form of needle shaped cracks in between fibre bundles parallel to x axis. This may arise from relaxation of thermal residual stresses or could be a function of the creep strains which could develop within the sample.
Once it was established that Nextel 720 with alumina matrix could perform adequately at the given temperature, 8 different variants, each with different fibre layup, weave pattern and processing temperature, were produced. Three-point bend tests were done at 1100°C, to quantify the effective flexural modulus along with the proportional limit stress, PLS, for each of the samples. The results suggested that out of all 8 samples, EF 20, which had a unidirectional fibre weave architecture, sintered at 1250°C, with an involute layup, had the most optimum mechanical properties.
Creep tests were carried out on beam specimens in three-point bend test configuration at 25MPa stress, at 1100°C. The results indicated that EF 20, due to its unidirectional weave configuration, developed lower primary and secondary creep strains, in comparison to EF 19 which had 50% fibre tows in the warp and the weft directions. The involute layup outperformed the 0/90° layup, due to higher shear strength between the layers. The samples sintered at 1250°C had similar creep performance to the samples sintered at 1200°C. Using the effective modulus values calculated for EF 19-1 and EF 20-1, piston rings with a gauge diameter of 140 mm were designed and subjected to a constant deflection condition with a nominal stress of 25 MPa, at 1100°C. The EF 19 ring performed adequately, only losing 13% of their spring at 1100°C. When the fitted stress was beyond the PLS limit permanent microstructural deformation was observed in the sample, EF 20, which resulted in higher stress relaxation than normal. Hence future ring design must be done keeping in mind the PLS. The manufacturing process should be reviewed, such that the machining of the piston ring does not result in cutting through the fibre layers, lowering the number of defects and consequently resulting in a higher PLS. This work was successful in identifying and modifying an oxide based ceramic matrix composite system for use in gas turbine sealing applications at 1100°C
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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