1,720,953 research outputs found
Seasonal variation of the hyperiid amphipod assemblages in the Colombian pacific
No full textSe evaluó la variación temporal (época seca vs lluvias) y espacial (nerítico vs océano) de la estructura de los ensambles de los anfípodos hipéridos en el Pacífico de Colombia en relación con la dinámica oceanográfica local. Se realizaron cuatro cruceros oceanográficos durante 2007-2008, dos en la época seca (feb.07 y mar.08) y dos en la época de lluvias (sep.07 y sep.08). Se registró la temperatura y la salinidad. Se recolectaron muestras de zooplancton mediante arrastres verticales de 200 m a la superficie. Las menores temperaturas ( 34) a 30 m se registraron durante la época seca, mientras que un patrón inverso se observó en la época de lluvias (temperatura > 25°C, salinidad 70%) y abundantes (76%). Los mayores valores de diversidad, abundancia y biomasa de hipéridos se registraron durante la época seca y en la zona oceánica. Como consecuencia de la variabilidad hidrográfica asociada al gradiente nerítico-oceánico, se encontró que la estructura de los ensambles de hipéridos cambió espacialmente. Durante la época de lluvias se establecieron dos ensambles: uno para la zona nerítica, caracterizado por una baja diversidad y alta dominancia de H. sibaginis, y otro para la zona oceánica, con alta diversidad y con H. sibaginis, L. bengalensis, L. schizogeneios e Hyperietta vosseleri contribuyendo principalmente a la similitud. En contraste, durante la época seca la estructura fue similar entre las dos zonas, con H. sibaginis, L. bengalensis y L. schizogeneios contribuyendo principalmente a la similitud. Este resultado sugiere que durante la época seca, las aguas frías y salinas que influenciaron toda la cuenca incluyendo la zona nerítica, permitieron que especies principalmente oceánicas aumentaran su distribución. Por el contrario, el fuerte contraste nerítico-oceánico en la salinidad durante la época de lluvias, como consecuencia de la alta precipitación que caracteriza la región, limitó la distribución de algunos hipéridos, y favoreció la dominancia de H. sibaginis. Este resultado fue consecuente con la relación encontrada entre la estructura de los ensambles de hipéridos y las variables físicas, ya que la salinidad (6 y 30 m de profundidad) fue la variable que mejor explicó los patrones observados para los hipéridos (ρs = 0.31). Finalmente, la abundancia de los hipéridos se correlacionó significativamente con los organismos gelatinosos (sifonóforos, ctenóforos, doliólidos y salpas) que estos comúnmente usan como hospederos.The variability of hyperiid amphipod assemblages is analyzed in function of seasonal changes (dry vs rainy) and spatial differences (neritic vs oceanic) in the Colombian Pacific basin. Four oceanographic cruises were carried out during 2007-2008, two during dry season (Feb.07 and Mar.08), and two during the rainy season (Sep.07 and Sep.08). The temperature and salinity were recorded. Vertical tows from 200 m to the surface were done to collect zooplankton samples. Cooler ( 34) at 30 m were observed during the dry season, while the opposite pattern occurred during the rainy season (> 25°C, 70%) and abundant (76%). Higher diversity of hyperiids as well as higher abundance and biomass were present during the dry season and in the oceanic region. The structure of the hyperiid assemblages changed spatially as a consequence of the hydrographic variability associated with the neriticoceanic gradient. Similarity analysis resulted in two assemblages lightly different during the rainy season: one for the neritic area with low diversity and high dominance of H. sibaginis, and other for the oceanic area with high diversity and shared dominance of four species (H. sibaginis, L. bengalensis, Lestrigonus schizogeneios and Hyperietta vosseleri). In contrast, the structure was spatially similar during the dry season, with H. sibaginis, L. bengalensis and L. schizogeneios contributing mainly to the similarity. These results suggested a penetration of species toward the coast during the dry season promoted by colder and saltier waters influencing all the study area. The strong neritic-oceanic contrast in salinity during the rainy season due to high precipitation volumes limited the distribution of some hyperiids and enhanced the dominance of H. sibaginis. This result was consequent with the relation found between the structure of the hyperiid assemblages and physical variables. Salinity (6 and 30 m depth) was the variable that better explain the observed patterns of hyperiids (ρs = 0.31). Finally, the abundance of hyperiids was significantly correlated with the abundance of gelatinous zooplankton (siphonophores, ctenophores, doliolids and salps) which are commonly used as hosts by this group
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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