1,720,954 research outputs found
Trend analysis of hydrological cycle variables in Chingaza National Natural Park and their possible links to climate variability, climate change, and changes in Amazon forest cover
No full textilustraciones, diagramas, mapasEl Páramo de Chingaza desempeña un papel crucial para Bogotá, puesto que abastece al 70% de los habitantes de la ciudad. Comprender la alteración de las variables hidroclimatológicas y su relación con el cambio y la variabilidad climática, y con el cambio de cobertura permite tomar decisiones más informadas para la gestión sostenible de los recursos hídricos de la región. Mediante la aplicación del test de Man-Kendall y Sen´s Slope se analizaron las tendencias en las variables hidroclimatológicas en el Parque Nacional Natural Chingaza (PNN Chingaza). Los resultados revelan que el 82% de las series de precipitación convencional presentan tendencias no significativas mixtas. En contraste, tres de las cinco cuencas estudiadas registran disminuciones en el caudal medio. En la evapotranspiración, se identifican tendencias crecientes significativas con incrementos de 6 mm por decenio. Mediante el análisis de datos de cobertura y uso del suelo reportados por MapBiomas se identificaron altas correlaciones en el test de Spearman (0.80 y 0.64) entre la pérdida del bosque amazónico y el comportamiento de las series de caudal medio en el PNN Chingaza. Mediante previa validación realizada a los mapas de MapBiomas se obtuvo una precisión general del 96%. Se encontró que cambios impulsados por el clima y por el paisaje han generado desplazamientos importantes de las cuencas en el espacio de Budyko. En cuanto a la influencia de la deforestación de la Amazonia en el PNN Chingaza, se evidencian disminuciones en el caudal medio, posiblemente asociadas a alteraciones de los flujos aéreos de agua en forma de vapor (“Ríos voladores”) que se ven reflejadas en las entradas al sistema, especialmente en la precipitación horizontal. En consecuencia, resulta esencial la implementación de estrategias a nivel local y regional para garantizar la continuidad de los servicios ecosistémicos que el páramo y el bosque amazónico prestan (Texto tomado de la fuente).The Chingaza Páramo plays a crucial role for Bogotá, as it supplies 70% of the city's population. Understanding the alteration of hydroclimatological variables and their relationship with climate change, climate variability, and land cover change allows for more informed decisions to be made for the sustainable management of the region's water resources. By applying the Man-Kendall test and Sen's Slope, trends in hydroclimatological variables were analyzed in the Chingaza National Natural Park (PNN Chingaza). The results reveal that 86% of conventional precipitation series show mixed non-significant trends. In contrast, three of the five studied watersheds show decreases in average streamflow. Significant increasing trends were identified in evapotranspiration, with increases of 6 mm per decade. Using land cover and use data reported by MapBiomas, high correlations were identified in the Spearman test (0.80 and 0.64) between the loss of Amazon forest and the behavior of the average streamflow series in the PNN Chingaza. After validating the MapBiomas maps, an overall accuracy of 96% was obtained, and it was found that climate- and landscape-driven changes have caused significant shifts in the watersheds within the Budyko space. Regarding the influence of deforestation in the Amazon on PNN Chingaza, decreases in average streamflow were observed, possibly associated with alterations in atmospheric water flows in the form of vapor ("flying rivers") that are reflected in system inputs, especially in horizontal precipitation. Consequently, the implementation of local and regional strategies is essential to ensure the continuity of the ecosystem services provided by the páramo and the Amazon forest.MaestríaMagíster en Ingeniería - Recursos HidráulicosHidrología y Meteorologí
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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