1,720,977 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
Study of the interface - interphase of a Mg-CNT composite made by an alternative sandwich technique
Get PDFCarbon nanotubes (CNTs) have been studied as potential reinforcement for Metal Matrix Composites (MMC) for improving the mechanical properties. However, dispersion and alignment of CNTs in the matrix has been very difficult due to their tendency to form clusters. In the present investigation, the synthesis of AZ31B magnesium alloy reinforced with multi-walled carbon nanotubes (MWCNTs) have been developed via the “sandwich” technique. This technique produces a material comprised of a metallic matrix and banded structures-layers of MWCNTs, where a polymeric solution is used to disperse and align the MWCNTs. As a result, a better dispersion and alignment of the CNTs in metal matrix composites was obtained. The results obtained showed a good interface between the metal matrix and the MWCNTs, allowing a very good interfacial bonding; thus, the mechanical properties, both at the nano level and in bulk, always showed a good behavior. For this characterization, several microscopy techniques including TEM in situ testing, nanomechanical tests and bulk mechanical tests were used. In the studied zones, interphases between the metal matrix and MWCNTs were not found, phases which could hamper the proper load transference between the matrix and reinforcement. HRTEM analysis allowed to identify the interactions between the metal matrix composites and MWCNTs. In the HRTEM images a semi-coherent and coherent interface between the metal matrix and MWCNTs was found. Additionally, two type of dislocations at the interface were identified: stacked and some dislocations formed to accommodate the Mg crystalline cell in order to produce a semi-coherent surface. No intermediate interphases were found in the studied zones. Notched micro-cantilever in situ TEM tests showed the dependency of the fracture toughness with the MWCNTs added in the magnesium matrix. Suggesting that the fracture toughness of the reinforced zone increases with the MWCNTs percentage added. This changes in the fracture toughness is due to the different strengthening mechanisms such as grain size, dislocation activity and finally to the reinforcements action. On the other hand, microtraction test of the composite clearly shown an increasing in the ultimate strength, stiffness and fracture toughness while the main final failure mechanism of the composite was delamination. Finally, PEO (plasma electrolytic oxidation) coatings were applied on the composite surfaces in order to protect them against corrosion. The results showed a good mechanical and electrochemical behavior of the coating. These results allow thinking in using this kind of composites in medical applications.Resumen: Los nanotubos de carbono (CNTs , por sus siglas en inglés) han sido usados como un refuerzo ideal para mejorar las propiedades mecánicas de los materiales compuestos de matriz metálica. Sin embargo, su dispersión y alineación dentro de la matriz es difícil debido a su tendencia a aglomerarse. En la presente investigación, se sintetizó magnesio reforzado con nanotubos de carbono de pared múltiple (MWCNTs, por sus siglas en inglés) por medio de una nueva técnica denomina da tipo sándwich, la cual permite una mejor dispersión y alineación de los nanotubos de carbono en la matriz metálica. Esta técnica produce un material compuesto de matriz metálica por medio de un apilamiento de láminas metálicas y láminas de polímero reforzado con MWCNTs, donde el material polimérico es usado para dispersar y alinear los MWCNTs. Los resultados obtenidos mostraron un muy buen comportamiento de la intercara entre la matriz metálica y los MWCNTs, permitiendo una muy buena unión interfacial; por lo tanto, las propiedades mecánicas, a nivel nano y en volumen, mostraron siempre un buen comportamiento. Para la caracterización se utilizaron varias técnicas de microscopía, pruebas in situ, pruebas nanomecánicas y pruebas mecánicas en volumen. En las zonas de estudio no se hallaron interfases entre la matriz metálica y los MWCNTs, que pudieran dificultar la adecuada transferencia de esfuerzos entre la matriz y los MWCNTs. El análisis HRTEM permitió identificar las interacciones entre los compuestos de matriz metálica y los MWCNT. En las imágenes HRTEM se encontró una interfaz semi-coherente y coherente entre la matriz metálica y los MWCNT. Además, se identificaron dos tipos de dislocaciones en la interfaz: apilamiento y formación de dislocaciones, esta última con el fin producir una superficie semi-coherente. Finalmente, no se encontraron interfases intermedias en las zonas estudiadas. Las pruebas de TEM in situ mostraron la dependencia de la tenacidad a la fractura con los MWCNT añadidos en la matriz de magnesio. Los resultados sugieren que la resistencia a la fractura de la zona reforzada aumenta con el porcentaje de MWCNT añadido. Estos cambios en la resistencia a la fractura se deben a los diferentes mecanismos involucrados, como el tamaño del grano, la actividad de dislocación y finalmente a la acción de los XIV Study of the interface - interphase of a Mg - CNT composite made by an alternative sandwich techniquerefuerzos. Por otro lado, la prueba de micro- tracción del material compuesto mostró claramente un aumento en la resistencia final, la rigidez y la tenacidad a la fractura, mientras que el mecanismo de falla final principal del compuesto fue la de-laminación. Por último y como trabajo adicional, en las superficies de los materiales compuestos se aplicaron recubrimientos de PEO oxidación electrolítica por plasma) para protegerlos contra la corrosión. Los resultados mostraron un buen comportamiento mecánico y electroquímico. Estos resultados permiten pensar en el uso de este tipo de compuestos para aplicaciones médicas.Doctorad
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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