1,720,953 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Desenvolvimento de membranas poliméricas baseadas em materiais híbridos de oxido de grafeno e zeolita para tratamentos de águas
Full text linkA fornecimento de água potável é uma preocupação crescente de sociedades em diferentes
regiões do mundo. O crescimento populacional, a industrialização e as mudanças climáticas
são fatores quem têm contribuído para a escassez destes recursos hídricos. De forma a
enfrentar esse problema, o desenvolvimento de tecnologias eficientes e sustentáveis para
explorar fontes de água não convencionais, como por exemplo a água do mar e água salobra,
torna-se um fator importante. Nesse sentido, esse trabalho foi balizado no estudo e
desenvolvimento de membranas para aplicações em tratamento de águas, com o objetivo de
promover a dessalinização da água para os mais diversos usos industriais, utilizando óxido
de grafeno e zeólita A, obtida de cinzas de biomassa. Para o preparo das membranas utilizouse
a polissulfona (PSF) solubilizada em clorofórmio como polímero de suporte e formação
do compósito polimérico com o óxido de grafeno (GO) e a zeólita A (ZeoA). Testou-se dois
tipos de GO oxidados por dois períodos distintos, sendo um de 2 horas e outro de 48 horas
de oxidação. As amostras de GO foram dispersas em etanol e N-metil-pirrolidona com
auxílio de sonicação e, posteriormente, incorporados à PSF solubilizada em clorofórmio. A
ZeoA foi dispersa diretamente com a PSF em clorofórmio. O material foi aplicado sobre uma
lâmina de vidro e por inversão de fase em água deionizada houve a formação de membranas
de filme fino. A avaliação da remoção de sais por estas membranas foi feita por
cromatografia de íons com soluções padrões de Na+, K+, Ca2+ e Mg2+. Os resultados com
membranas de PSF/GO indicaram reduções de 49,5% para sódio, 38,5% para potássio, 60,2 %
para cálcio e 59 % para magnésio. Com as membranas híbridas de PSF/GO/ZeoA, obteve-se
redução de 43,4% de K+, 90,3% de Ca2+ e 87,5% de Mg2+ utilizando-se processos de filtração,
em comparação à membrana polimérica que não possui os nanomateriais incorporados em
sua formulação. Além dos testes experimentais, também foram realizadas simulações de
dinâmica molecular que confirmam que a presença de GO mais oxidado na membrana,
proporcionam melhores resultados de remoção para os íons K+, Ca2+, Mg2+. Os resultados
obtidos demonstraram a potencialidade dos compósitos poliméricos sintetizados com
nanomateriais, na remoção de espécies iônicas que, além da facilidade de seu preparo, podem
ser escalonados para uso industrial.Some of the most important challenges today is to guarantee the supply of water in sufficient
quantity and quality for the demands of society. Population growth, industrialization and
climate change are factors that have contributed to the scarcity of these water resources. In order to face this problem, it is important to develop efficient and sustainable technologies to exploit unconventional water sources, such as sea water, brackish water or wastewater, and to obtain an increase in water supply beyond the sources natural. In this sense, this work aims to study and develop membranes for water treatment applications, with the objective of desalinating water and using for the most diverse industrial uses, using graphene oxide and zeolites obtained from biomass ash. For the preparation of the membranes, polysulfone was solubilized in chloroform was used as the supporting polymer and the formation of the polymer composite with graphene oxide and zeolite. Two types of graphene oxide oxidized for two different periods were tested, one for 2 hours and the other for 48 hours of oxidation. The GO samples were dispersed in ethanol and N-methyl-pyrrolidone with the aid of sonication and, later, incorporated into the polymeric binder agent. ZeoA was dispersed directly with PSF in chloroform. The material was applied on a glass slide and by phase inversion in deionized water occur the thin film membranes formation. The evaluation of salt removal of these membranes was done by ion chromatography (IC) with standard solutions of Na+, K+, Ca2 + and Mg2 +. The results with PSF/GO membranes indicated reductions of 49.5% for sodium, 38.5% for potassiu m, 60.2% for calcium and 59% for magnesium. With the PSF/GO/ZeoA hybrid membranes, 43.4% for K+, 90.3% for Ca2+ and 87.5% for Mg2+ ion using filtration processes, compared to the polymeric membrane that it does not have nanomaterials incorporated in its formulation. In addition to the experimental tests, simulations of molecular dynamics were also carried out, confirming that the presence of more oxidized GO in the membrane, presents better removal results for the K+, Ca2 + and Mg2 + ions. The results obtained demonstrated the potential of polymeric composites synthesized with nanomaterials, in the removal of ionic species, in addition to the ease of their preparation, which can even be scaled for industrial use.Instituto Presbiteriano Mackenzi
Variations on the Author
Full text link“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
Full text linkWe 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
Full text linkWe 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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