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Escória de ferro-níquel como material cimentício suplementar em substituição parcial ao clínquer portland em pastas e argamassas de alta resistência
No full textFerronickel slag (FNS) is an industrial by-product, and it’s used in construction as a potential aggregate or binder. This material is subject of research aimed at improving the mechanical properties and durability of concrete and mortar. This study aimed to evaluate the effect of incorporating FNS on the fresh and hardened state performance of pastes and mortars. FNS was incorporated to ground clinker with gypsum at mass proportions of 10%, 20%, and 30%, with a fineness of 5,900 cm²/g, as well as at 20% with a fineness of 9,300 cm²/g, to simultaneously evaluate the influence of surface area. Samples containing 20% limestone filler were also produced. The pastes were evaluated in terms of fresh state properties through rheological tests and calorimetry. In self-compacting concrete mortars, technological tests including slump flow, flow time through a mini V-funnel, density, and air content were conducted in the fresh state, as well as compressive strength in hardened state mortars. Rheological tests showed a reduction in static and dynamic shear stresses of 20% and 18%, respectively, at 10 minutes, on average, for samples containing FNS with specific surface area of 5,900 cm²/g. Reductions in heat release peaks were observed in samples containing FNS, up to 22% in sample P-E30. Compositions containing FNS with specific surface area of 5,900 cm²/g showed slump flow values 16% to 29% higher than the reference at 10 minutes. This increased fluidity was maintained at 60 minutes. The sample with FNS with a specific surface area of 9,300 cm²/g showed only a 6% higher flow than the reference at 10 minutes. All samples with supplementary cementitious materials had shorter flow times through the mini V funnel, with an average reduction at 10 minutes and 60 minutes of 38% and 44%, respectively. Mortars containing FNS exhibited a proportional reduction in compressive strength of 5% to 13%, higher when the FNS content was higher. The cement intensity index was on average 13% lower with the use of FNSA escória de ferro-níquel (EFN) é um subproduto industrial, sendo o uso deste material na construção civil, como potencial agregado ou aglomerante, tema de pesquisas em que se busca melhorar propriedades mecânicas e de durabilidade de concretos e argamassas. Este trabalho objetivou avaliar o efeito da incorporação de EFN no desempenho no estado fresco e endurecido de pastas e argamassas. A EFN foi incorporada ao clínquer moído com gipsita em teores de 10%, 20% e 30% em massa, com finura de 5.900 cm²/g, bem como no teor de 20% com finura de 9.300 cm²/g, avaliando paralelamente a influência da área superficial. Foram produzidas também amostras contendo 20% de fíler calcário. As pastas tiveram suas propriedades no estado fresco avaliadas a partir de ensaios reológicos e de calorimetria. Em argamassas para concretos autoadensáveis, foram realizados ensaios tecnológicos de espalhamento, tempo de escoamento por mini funil V, massa específica e ar incorporado, no estado fresco, bem como a resistência à compressão em argamassas no estado endurecido. Os ensaios reológicos demonstraram redução das tensões de cisalhamento estáticas, de 20%, e dinâmicas, de 18%, aos 10 min, da média das amostras contendo a EFN 5.900 cm²/g. Percebeu-se redução nos picos de liberação de calor das amostras contendo EFN, de até 22% na amostra P-E30. As composições contendo EFN com finura Blaine de 5.900 cm²/g apresentaram valores de espalhamento 16% a 29% maiores do que a referência, aos 10 min. Esta maior fluidez se manteve aos 60 min. A amostra com EFN com área superficial de 9.300 cm²/g obteve um espalhamento 6% maior do que a referência, aos 10 min. Todas as amostras com materiais cimentícios suplementares obtiveram menor tempo de escoamento por mini funil V, com uma redução média aos 10 min e 60 min de 38% e 44%, respectivamente. As argamassas contendo EFN apresentaram uma redução de resistência à compressão de 5% a 13%, com reduções maiores conforme o teor da escória aumentou. Os índices de intensidade do cimento diminuíram em média 13
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
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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