1,720,954 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
Additive Manufacturing of Bonded NdFeB Magnets by Selective Laser Sintering
No full textPermanent magnets are used in many everyday devices to assist in the conversion of electronic energy into mechanical energy. Traditional manufacturing pathways are well established, however, they inherently suffer from long lead times and high costs for low volume production runs. A technique known as additive manufacturing (colloquially 3D printing) has been applied to many industries using a multitude of materials with success in reducing both product development times and cost for prototypes and low volume production runs. Due to this reported success, several additive manufacturing techniques have been investigated in order to rapidly produce magnets of custom geometries using isotropic magnetic material (specifically neodymium-iron-boron). Although some of these techniques have shown promise, many require pre-processing of the raw powders into a filament or fluid suspension, thus increasing the number of steps in the process. As permanent magnet raw material is commercially available in powdered form, it was hypothesised that a powder-based additive manufacturing technique known as selective laser sintering could be used to produce permanent magnets by mechanical alloying of magnetic powder with a powdered polymer binder. It was further hypothesised that by combining the use of high energy anisotropic magnetic powder with an in-situ alignment fixture, as used in the industrial manufacturing process, permanent magnets with higher performance than those produced using additive manufacturing from isotropic powders. Accordingly, there were three key aims in this research project: ii Additive Manufacturing of Bonded NdFeB Magnets by Selective Laser Sintering Develop a selective laser sintering machine from off-the-shelf components and compare the geometrical and mechanical properties of the produced polyamide-12 parts with that of a commercial machine. Using two commercially available isotropic magnetic powders with flake and sphere particle morphologies mixed with polyamide-12 powder, determine the processing parameters and mixing ratios which lead to magnets with the most accurate geometrical and strongest mechanical and magnetic properties. Develop and test an in-situ particle alignment fixture and examine its effect on the geometrical and magnetic properties of magnets produced from anisotropic magnetic powder mixed with polyamide-12. The first experimental chapter (Chapter 3) covers designing, building and validating the tool required to conduct the research which is a selective laser sintering machine produced solely from off-the-shelf parts. Over the next two chapters (Chapters 4 and 5), the influence of machine processing parameters (laser power = 0.5 – 1.17 W, scan spacing = 0.11, 0.22, 0.31 mm) and powder loading fraction (0 – 90%/vol) on the properties of magnets produced from two commercially available neodymium-iron-boron powders was examined. By examining the geometrical, mechanical and magnetic properties, preferred processing parameters and mixing ratios could be identified based on their deviation from model data and highest mechanical and magnetic strength. Next (Chapter 6), an in-situ alignment fixture based upon a Helmholtz coil was proposed and a prototype developed. The ability of the coil to impart torque to anisotropic particles while minimising translational forces was examined using images captured with an optical microscope then evaluated using image processing techniques to characterise the percentage of loose particles it could align. Finally (Chapter 7), the Helmholtz coil-based alignment fixture was added to the selective laser sintering machine where it was used to provide an alignment field to each layer of anisotropic powder prior to consolidation by the laser. The geometry, density and magnetic properties of the permanent magnets were examined in the presence and absence of the alignment field. The constructed selective laser sintering machine was demonstrated to produce parts from polyamide-12 reaching densities of 918 ± 9 kg/m3 and achieving an elastic Additive Manufacturing of Bonded NdFeB Magnets by Selective Laser Sintering iii modulus of 358.36 ± 3.04 MPa and elongation at break of 11.13 ± 0.02%. Permanent magnets produced from the mechanically alloyed commercial powders demonstrated the best properties with a supplied energy density of 0.255 J/mm2 possessing comparable magnetic characteristics to those produced with other AM methods (311 ± 9 and 363 ± 6 mT for the flake and spherical powders respectively). It was also demonstrated that magnetic powder loading fractions above 30%/vol for the spheres and 50%/vol for the flakes showed no significant increases in magnetic performance while the mechanical performance deteriorated significantly. An in-situ alignment fixture, based upon a Helmholtz coil, demonstrated 30% alignment of a selection of particles according to optical image analysis of randomly orientated flake particles. When used during the processing of magnets, the magnetic performance, when using anisotropic powder, was shown to increase by 28%. However, the low loose packing density of the starting powder (2880 kg/m3) compared to the isotropic powders (3023 kg/m3 for the flakes and 4017 kg/m3 for the spheres) limited the maximum density of the magnets and thus suffered from poorer than expected magnetic performance. The content of this thesis demonstrates the development of an open source-based selective laser sintering machine which was then used to explore the production of permanent magnets from commercially available isotropic and anisotropic powders with the addition of an in-situ alignment fixture.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Eng & Built EnvScience, Environment, Engineering and TechnologyFull Tex
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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