1,720,955 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
Módulo dinámico por vibraciones transversales de madera densificada de Gyrocarpus americanus
Get PDFEl densificado artificial de la madera incrementa sus propiedades tecnológicas. Como consecuencia, especies poco apreciadas pueden ser empleadas en productos con valor agregado. Los objetivos de la investigación fueron densificar madera de Gyrocarpus americanus con un tratamiento higro-termo-mecánico y evaluar su módulo dinámico antes y después del densificado.
Se determinó la densidad de la madera y se realizaron pruebas de vibraciones transversales antes y después del densificado. Se calcularon los módulos dinámicos y el coeficiente de densificado. Para las variables de respuesta, se realizaron pruebas de normalidad, de diferencias de medias y análisis de regresiones. El tratamiento higro-termo-mecánico fue eficiente para densificar madera de G. americanus. Los valores de la densidad de la madera y del módulo dinámico aumentaron después de densificar la madera de G. americanus y sus magnitudes fueron comparables con los reportados en la bibliografía. Los coeficientes de determinación de regresiones lineales explicaron satisfactoriamente la variación ocasionada por el tratamiento de densificado en la densidad de la madera, la frecuencia y el módulo dinámico
Retention and absorption of boron salts solution of ten mexican woods
Get PDFLas sales de boro son un agente protector para la madera con un amplio espectro en su acción fungicida e insecticida, de poca toxicidad, inodoras, incoloras e incombustibles, y su aplicación es una de las estrategias más efectivas de preservación. La presente investigación tuvo por objetivo determinar la densidad de la madera, la absorción y la retención de sales de boro de diez maderas mexicanas. Se propuso como hipótesis de trabajo que la capacidad de retención de sales de boro de la madera depende, principalmente, de la especie, y es independiente de la densidad y de la porosidad. Se prepararon 30 litros de solución de sales de boro con una concentración al 3%. Las probetas se impregnaron con el método baño caliente-frío. Se diseñó un experimento de análisis de varianza para comparar los valores medios de la densidad de la madera, de la absorción y de la retención, como las variables de respuesta, evaluadas para cada una de las diez especies de madera. La especie de madera fue considerada el factor de variación. La absorción de sales de boro varió entre 136 kg/m3 y 476 kg/m3. Los valores promedio de retención de sales de boro para todas las especies fueron mayores que el límite inferior tóxico de retención comprendido en el intervalo de retención que va de 0.2 kg/m3 a 4.7 kg/m3, reportado en trabajos anteriores. Se concluye que cada especie tiene una retención de sales de boro diferente, y la capacidad de absorción es particular a cada una de ellas y no está relacionada con su densidad.Boron salts are a wood protector agent with a wide spectrum in their fungicidal and insecticide action and of low toxicity, odorless, colorless and nonflammable, and their application is one of the most effective preservation strategies. This research aims to determine the density of wood, absorption and retention of the boron salts of ten Mexican woods. The working hypothesis proposed in this investigation is that wood retention capacity of boron salts depends mainly on the species and is independent of its density and porosity. Thirty liters of boron salts solution with a concentration of 3 % were prepared, the wood specimens were impregnated by following the “hot-cold bath” method. It was designed an experiment that compared means of the density of wood, the absorption and the retention, as the response variables, assessed for each one of the ten wood species. Wood species was considered as the variation factor. Absorption of Boron salts varied between 136 kg/m3 and 476 kg/m3. Average values of the boron salts retention for all species were higher than lower retention toxicity limit reported in previous researches (0.2 kg/m3 to 4.7 kg/m3). It was concluded that each species has different boron salts retention. Absorption capacity is specific to each species and it is not related to the wood density
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
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