1,720,958 research outputs found
Efeitos da restauração florestal sobre os atributos do solo e da vegetação após a mineração de bauxita em Paragominas, Pará.
Full text linkMineração Paragominas S.A; Grupo Hydro.O presente estudo teve como objetivo avaliar o efeito da restauração florestal sobre os atributos do solo e da vegetação em áreas mineradas após a lavra de bauxita em áreas sobre dois métodos de restauração: Indução da Regeneração Natural e Plantio de mudas, em áreas com dois e sete anos sob ambos os métodos. Para tanto, avaliou-se: (I) quantificação das matrizes que circundam as áreas estudadas, numa escala de paisagem, na área sobre Regeneração Natural;(II) riqueza e diversidade da vegetação em três estratos: superior, médio e inferior e (III) atributos físicos e químicos do solo nas áreas de estudo sob os métodos de plantio e regeneração natural. O estudo foi realizado em uma área de atividade mineraria pertencente a Mineração Paragominas S.A., localizada no município de Paragominas, Sudeste do estado do Pará. Nas áreas de regeneração natural, mesmo numa paisagem de entorno predominantemente florestal, a baixa diversidade e a alta dominância de indivíduos regenerantes levam ao desaparecimento repentino e abrupto dos componentes arbóreos durante a fase de transição sucessional, ocasionando a exposição do solo à colonização por espécies pioneiras ou herbáceas, como gramíneas. O sistema de regeneração natural aos sete anos foi altamente eficiente na recuperação de importantes atributos relacionados à qualidade do solo em superfície. No estrato superior, o plantio de mudas com sete anos foi eficiente na formação de uma comunidade florestal próxima a uma floresta de referência no que se refere a diversidade e equabilidade. Porém a falta de um critério na distribuição das mudas em campo e a operação de capina para controle de indivíduos regenerantes nos cinco primeiros anos afetou não somente a formação de uma fisionomia florestal, como também permitiu a ocorrência de grandes áreas com solo exposto, resultando em substrato com sérias limitações físicas e estruturais no sistema de plantio com sete anos.The present study aimed to evaluate the effect of forest restoration on soil and vegetation attributes in mined areas after bauxite mining in areas on two restoration methods: Induction of Natural Regeneration and Planting of seedlings in areas with two and Seven years under both methods. In order to do so, we evaluated: (i) quantification of the matrices that surround the studied areas, on a landscape scale, in the Natural Regeneration area; (ii) vegetation richness and diversity in three strata: upper, middle and lower and )
Physical and chemical attributes of the soil in the study areas under the methods of planting and natural regeneration. The study was carried out in an area of mining activity belonging to Mineração Paragominas SA, located in the municipality of Paragominas, Southeastern state of Pará. In the areas of natural regeneration, even in a predominantly forested landscape, the low diversity and the high dominance of Regenerating individuals lead to sudden and abrupt disappearance of tree components during the successional transition phase, causing soil exposure to colonization by pioneer or herbaceous species, such as grasses. The natural regeneration system at seven years was highly efficient in recovering important attributes related to surface soil quality. In the upper stratum, planting of seven-year-old seedlings was efficient in the formation of a forest community close to a reference forest in terms of diversity and equability. However, the lack of a criterion in the distribution of seedlings in the field and the weeding operation to control regenerating individuals in the first five years affected not only the formation of a forest physiognomy, but also allowed the occurrence of large areas with exposed soil, resulting in Substrate with serious physical and structural limitations in the seven-year planting system
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
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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