1,721,040 research outputs found
Sensibilidad Fotorrefractiva en la Mezcla de Cuatro Ondas
Get PDFUno de los parámetros de interés, en aplicaciones holográficas con materiales fotorrefractivos, corresponde a la evolución dinámica registro-borrado del holograma. A partir de la dinámica de registro nosotros determinamos la constante de sensibilidad fotorrefractiva de dos cristales de BSO.One of the parameters of interest in applications holographic with photorefractive crystals, corresponds to the dynamic evolution of the hologram record-erasure. From the recorded dynamic we determined the sensitivity constant photorefractive two BSO crystals.Fil: Rueda Parada, Jorge Enrique. Universidad de Pamplona; Colombia. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Guerra Hernandez, Luis Alfonso. Universidad de Pamplona; Colombia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Modelos econométricos espaciales: una perspectiva Bayesiana
Get PDFSe propone un conjunto de modelos econométricos espaciales Bayesianos que toman como referencia la propuesta realizada en Anselin (1988). Más adelante se proponen alternativas para muestrear las distribuciones condicionales a posteriori de algunos parámetros con base en el algoritmo de Metropolis-Hastings y en variables de trabajo. Se realizan simulaciones y aplicaciones para mostrar el alcance de esta propuesta, así como una introducción al paquete BSPADATA de R.Abstract: A set of Bayesian spatial econometric models is proposed based on the models introduced in Anselin (1988). Then, alternative approaches for sampling the conditional posterior distributions of some parameters are presented. These approaches involve the Metropolis-Hastings algorithm and the working variables approach. Simulations and applications are made in order to show the performance of this proposal. Finally, the R-package BSPADATA is introduced.Maestrí
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
Spatial statistical models using citizen science data and professional surveys for biodiversity insight
Get PDF- …
