1,720,953 research outputs found
Variação espacial de comunidades de biofouling em estuários com e sem atividade portuária
Get PDFOrientador: Prof.ª Dr. Andre Andrian PadialCoorientadora: Prof. Dra. Rosana Moreira da RochaDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Biológicas, Programa de Pós-Graduação em Ecologia e Conservação. Defesa : Curitiba, 27/03/2025Inclui referênciasResumo: O aumento das atividades antrópicas em regiões costeiras tem levado à expansão de superfícies artificiais que atuam como substratos para organismos marinhos, facilitando a introdução de espécies exóticas. Esse fenômeno contribui para a homogeneização biótica, que descreve a diminuição da variação espacial na composição das espécies entre as comunidades locais ao longo de um gradiente geográfico. Este estudo tem como objetivo avaliar a variação espacial na composição das comunidades incrustantes em quatro estuários brasileiros das regiões Sudeste e Sul, comparando áreas afetadas e não afetadas por estruturas portuárias durante o verão e o inverno, com base nos padrões de diversidade beta. As amostragens foram realizadas utilizando placas de polietileno submersas em cada estuário por um período de 3 meses, em 2017 e 2018, cobrindo ambas as estações do ano. A análise revelou a presença de 19 espécies exóticas, 16 criptogênicas e 6 nativas, formando comunidades distintas em cada baía, com influência das variações sazonais. A maioria das espécies que mais contribuíram para a formação das comunidades possui formas de vida colonial e a variação espacial na composição dos organismos parece ser contexto-dependente. A diversidade de impactos observada em todos os estuários estudados, assim como a alta capacidade de dispersão das espécies, indicam que não há evidências suficientes para concluir que estuários com atividade portuária apresentem menor variação espacial nas comunidades. A região de Paranaguá, fortemente impactada por estruturas portuárias, apresentou curvas de dissimilaridade acentuadas, refutando parcialmente nossa hipótese inicial. Também demonstramos que há variação composicional entre as estações, mas que esta não influencia os padrões de variação espacialAbstract: The increase in anthropogenic activities in coastal regions has led to the expansion of artificial surfaces that serve as substrates for marine organisms, facilitating the introduction of exotic species. This phenomenon contributes to biotic homogenization, which describes the reduction of spatial variation in species composition among local communities along a geographic gradient. This study aims to assess the spatial variation in the composition of fouling communities in four Brazilian estuaries in the Southeast and South regions, comparing areas affected and unaffected by port structures during both summer and winter, based on beta diversity patterns. Sampling was carried out using submerged polyethylene plates in each estuary for a period of 3 months, in 2017 and 2018, covering both seasons of the year. The analysis revealed the presence of 13 exotic species, 15 cryptogenic species, and 9 native species, forming distinct communities in each bay, influenced by seasonal variations. Most of the species that contributed most to community formation have colonial life forms, and the spatial variation in the composition of organisms appears to be context-dependent. The diversity of impacts observed in all the estuaries studied, as well as the high dispersal capacity of the species, suggests that there is insufficient evidence to conclude that estuaries with port activity exhibit lower spatial variation in their communities. The Paranaguá region, heavily impacted by port structures, showed pronounced dissimilarity curves, partially refuting our initial hypothesis. We also demonstrated that there is compositional variation between seasons, but this does not influence the patterns of spatial variatio
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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