1,721,280 research outputs found
Descomposición térmica de la carbonil-borina en presencia de alquilaminas
No full textFil: Villa, Alberto Enrique. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Descomposición térmica de la carbonil-borina en presencia de alquilaminas
Full text linkFil: Villa, Alberto Enrique. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Destabilisation of Creeping Permafrost: The Plator Rock Glacier Case Study (Central Italian Alps)
No full textThe Plator rock glacier is the first such landform identified in the Italian Alps that shows destabilised behaviour. Analysis of six sets of sequential orthophotographs from 1981 to 2012 reveals an exceptional advance of the rock glacier front (92.1 m) and a horizontal velocity up to 4 m a-1 in different zones. The spatial variability of kinematics was evaluated by tracking sets of âtracerâ boulders on the rock glacier through time. Its velocity has progressively increased from the rooting zone to the tongue, with complex trends associated with distinct morphological features. Destabilisation likely occurred between 1954 and 1981, probably due to the relatively low elevation of the tongue, which resulted in warm permafrost conditions. Field observations reveal the presence of a large rock fall deposit, which occurred before 1981, and suggest that the debris overload could have triggered destabilisation. Since June 2015, an intensive monitoring programme has been implemented on the rock glacier, as the tongue is expected to travel over a steeper slope segment within the next 3 to 5 years, which could evolve in a catastrophic movement. Copyright © 2016 John Wiley & Sons, Ltd
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
Percepción de la legibilidad urbana del entorno circundante de la Autopista Américo Vespucio Sur : caso de estudio : Villa Alberto Larraguibel, comuna de La Florida, Santiago de Chile
Full text linkEste trabajo de investigación tiene como objetivo contribuir al estudio de la percepción de
las personas en los entornos espaciales generados por la construcción de carreteras en la
ciudad, específicamente a raíz de la inserción de infraestructuras de transporte como las
autopistas urbanas. Para ello, será fundamental comprender el fenómeno de expansión
urbana en el contexto nacional, particularmente en la Región Metropolitana.
La investigación se enfoca en el estudio de caso de la intersección entre la autopista
urbana Vespucio Sur y la Avenida Departamental, específicamente en la Villa Alberto
Larraguibel, ubicada en la comuna de La Florida, Santiago. Este conjunto habitacional,
construido en 1988 por el Ministerio de Vivienda y Urbanismo, fue diseñado para albergar a
1.508 familias.
La autopista Américo Vespucio Sur es una infraestructura clave dentro de la red de
autopistas de la Región Metropolitana de Santiago, extendiéndose a lo largo de 23,5 km,
desde la rotonda Grecia hasta la ruta 78, atravesando nueve comunas. Esta infraestructura
fue desarrollada bajo la ley de concesiones, siendo la primera en la Región Metropolitana
en utilizar este mecanismo, motivada por una participación activa del sector privado en un
contexto de neoliberalismo.
La investigación propone analizar dos componentes fundamentales de la teoría de Kevin
Lynch sobre la percepción y organización mental del espacio urbano: las sendas y los
nodos. Esta investigación se llevará a cabo con la participación activa de los habitantes de
la Villa Alberto Larraguibel. En síntesis, esta investigación proporciona antecedentes de cómo la construcción de la
autopista urbana Américo Vespucio Sur ha transformado el entorno inmediato de la Villa
Alberto Larraguibel y las consecuencias sobre la percepción de sus habitantes. Mediante
una combinación de métodos cualitativos y cuantitativos, la investigación busca
comprender los cambios en la Legibilidad, uso y experiencia del espacio urbano, por medio
de dos componentes de la Imagen Urbana según Kevin Lynch: sendas y nodos.Versión original del auto
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
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