1,720,953 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
Mechanical Properties of Casting ABS Plastic-Based Composite Reinforced by Polymer Derived Ceramic
No full textThe purpose of the research is to manufacture a composite which uses ABS plastic as matrix, and polymer derived ceramic (PDC) powder as reinforced filler. They are homogenously mixed and then casted for testing its mechanical properties. The polysilazane precursor(PSZ) is pyrolyzed at different temperatures, 700\uc2\ub0C ~ 1200\uc2\ub0C, turning the polysilazane into silicon oxycarbonitride (SiCNO) derived ceramic. The size of the SiCNO powder is about 1\uc2\ub5m ~ 10\uc2\ub5m. Different percentage of SiCNO powder is mixed with ABS plastic heated at 250\uc2\ub0C. The testing method and the size of the specimens of tensile, compression, and bending are all referring to ASTM standard. The density of 10wt.% SiCNO ceramic reinforced filler specimen pyrolyzed at 1100\uc2\ub0C is 1.1g/cm3\uef\ubcthere is a 8.3% of enhancement in comparison of pure ABS specimen.
SiCNO powders pyrolyzed at different temperatures are used as filler of specimens in tensile testing. While the pyrolyzed temperature of SiCNO powder is in a range of 700\uc2\ub0C ~ 900\uc2\ub0C , its stress and the young\ue2s modulus become higher by increasing pyrolytic temperature. The tensile stress of 10wt.% filler pyrolyzed at 1100\uc2\ub0C specimen is about 34.16MPa. There\ue2s an enhancement of 43% compares to that of the pure ABS specimen. The young\ue2s modulus of the same specimen is about 2.43GPa, the specimen holds a 42.1% of enhancement in young\ue2s modulus. The 10wt.% SiCNO ceramic reinforced filler specimen pyrolyzed at 1100\uc2\ub0C holds the highest young\ue2s modulus of 2.61GPa and a 52.6% of enhancement. The optimal toughness of composite specimen is about 538.1kN/m2 and only decreases 5.8% in comparison of pure ABS specimen, also performed by 10wt.% filler pyrolyzed at 1100\uc2\ub0C specimen.
5wt.%, 10wt.%, 20wt.%, and 30wt.% SiCNO ceramic of reinforced filler in ABS matrix pyrolyzed at 900\uc2\ub0C, 1000\uc2\ub0C, and 1100\uc2\ub0C are casted into compressive specimens. In compressive testing, the density and the young\ue2s modulus both become higher while the pyrolyzed temperature of ceramic filler gets higher. The specimen with 30wt.% filler pyrolyzed at 900\uc2\ub0C holds a young\ue2s modulus of 2.51GPa and a 34.2% of enhancement. At the 900\uc2\ub0C pyrolyzed temperature, the specimen with 5wt.% and 10wt.% PDC filler hold resilience of 531.4kN/m2 and 495 kN/m2\uef\ubcand the specimen with 20w.t% and 30wt% PDC filler hold resilience of 385.2kN/m2 and 294.6kN/m2. The result shows that the brittle-ductile transition of the composite is about 10wt.% ~ 20wt.% reinforced filler in ABS matrix. While beneath these percentages, the composite has almost the same resilience of absorbing energy and better mechanical properties compared with those of pure ABS plastic.
In bending testing, 5wt.% and 10wt.% SiCNO ceramic of reinforced filler in ABS matrix pyrolyzed at 900\uc2\ub0C, 1000\uc2\ub0C, and 1100\uc2\ub0C are casted into bending specimens. The result shows the specimen with PDC filler pyrolyzed at 900\uc2\ub0C holds the best bending strength and highest young\ue2s modulus, the bending strength increases about 7.2% and the young\ue2s modulus has an enhancement of 18.6%.
The results of the three mechanical properties testing shows that when each specimen with 10wt.% of SiCNO ceramic of reinforced filler in ABS matrix are pyrolyzed at 900\uc2\ub0C, its tensile strength is increase by 43.6%, the yield strength of the compression test is increase by 0.7%, and the strength of the bending testing is increase 7.2%. And also to compare each specimen with 10wt.% of SiCNO ceramic of reinforced filler in ABS matrix pyrolyzed at 1100\uc2\ub0C shows that the tensile strength is increase by 52.6%, the yield strength of compression is decrease by 0.4%, and the strength of bending is increase 0.8%. The results show that the SiCNO reinforced composite has the greatest tensile enhancement in three mechanical properties testing
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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