1,721,729 research outputs found
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
Evaluación termodinámica del proceso de pirólisis de biomasa
No full textEsta investigación presenta la evaluación termodinámica y cinética del proceso de pirólisis de la tusa de maíz, una biomasa lignocelulósica de amplia disponibilidad. Se desarrolla y valida un modelo cinético capaz de predecir los rendimientos y la composición de los productos generados (sólidos, líquidos y gases) durante el proceso. La metodología se basó en análisis termogravimétricos (TGA) realizados a diferentes tasas de calentamiento (5, 10 y 30°C/min) para caracterizar la descomposición térmica de la biomasa. A partir de la deconvolución de la curva de la derivada termogravimétrica (DTG), se determinaron las proporciones de los componentes principales: hemicelulosa, celulosa y lignina. Con esta información, se estimaron los parámetros cinéticos, como la energía de activación y el factor preexponencial, utilizando el método de Coats-Redfern. Estos parámetros fundamentales se implementaron en un software de simulación para modelar la distribución de productos a diversas temperaturas. Los resultados simulados mostraron una excelente concordancia con datos experimentales reportados en la literatura, con errores absolutos mayormente inferiores al 9%. Además, se realizó un análisis exergético local para evaluar la eficiencia y el potencial termodinámico a lo largo del proceso de conversión. Se concluye que la metodología desarrollada es una herramienta robusta y precisa para la predicción de los productos de la pirólisis. Este modelo representa un aporte significativo para el diseño y la optimización de procesos sostenibles orientados a la valorización de residuos agrícolas, facilitando la obtención de biocombustibles y productos químicos de valor añadido.This research presents the thermodynamic and kinetic evaluation of the pyrolysis process of corn cob, a widely available lignocellulosic biomass. A kinetic model is developed and validated to predict the yields and composition of the generated products (solids, liquids, and gases).The methodology was based on thermogravimetric analysis (TGA) conducted at various heating rates (5, 10, and 30°C/min) to characterize the thermal decomposition of the biomass. Through the deconvolution of the derivative thermogravimetric (DTG) curve, the proportions of the main components—hemicellulose, cellulose, and lignin—were determined. Based on this information, kinetic parameters, such as activation energy and the pre-exponential factor, were estimated using the Coats-Redfern method. These fundamental parameters were implemented in simulation software to model the product distribution at various temperatures. The simulated results showed strong agreement with experimental data reported in the literature, with absolute errors predominantly below 9%. Furthermore, a local exergy analysis was performed to assess the efficiency and thermodynamic potential throughout the conversion process. In conclusion, the developed methodology constitutes a robust and accurate tool for the prediction of pyrolysis products. This model represents a significant contribution to the design and optimization of sustainable processes for the valorization of agricultural residues, facilitating the procurement of biofuels and value-added chemicals.LISTA DE TABLAS 9LISTA DE FIGURAS 10RESUMEN 12ABSTRACT 131. INTRODUCCIÓN 142. REVISIÓN DE LITERATURA 162.1 Biomasa Lignocelulósica 162.2 Caracterización de la Biomasa 172.3 Pirolisis de Biomasa lignocelulósica 182.4 Modelos cinéticos de pirolisis de biomasa 223. OBJETIVOS 25Objetivo general 25Objetivos Específicos 254. MATERIALES Y MÉTODOS 26Objetivo 1. Definir los parámetros cinéticos de cada uno de los compuestos presentes en las reacciones del proceso. 26Objetivo 2. Modelar el proceso de pirolisis de biomasa empleando un reactor cinético y las reacciones de transformación lignocelulósica. 30Objetivo 3. Realizar un análisis exergético local del proceso de pirolisis de biomasa 335. RESULTADOS Y DISCUSIONES 36Objetivo 1. Definir los parámetros cinéticos de cada uno de los compuestos presentes en las reacciones del proceso. 36Objetivo 2. Modelar el proceso de pirolisis de biomasa empleando un reactor cinético y las reacciones de transformación lignocelulósica. 39Objetivo 3. Realizar un análisis exergético local del proceso de pirolisis de biomasa 496. CONCLUSIONES 507. RECOMENDACIONES: 528. REFERENCIAS BIBLIOGRÁFICAS 53MaestríaMagíster en Ingeniería MecánicaTrabajos de Investigación y/o Extensió
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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