1,720,972 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
La relatividad en el bachillerato. Una propuesta de unidad didáctica
No full textEn este artículo se argumenta a favor del mantenimiento de la introducción a la relatividad en el bachillerato. Se enumeran deficiencias en la enseñanza tradicional y se exponen las características básicas de una propuesta alternativa. A continuación se desarrollan algunas actividades del programa guía sugerido, destacando en él la definición del cuadrivector, el uso de los diagramas espacio-tiempo e impulso-energía, y el concepto de masa invariante. Se destaca así mismo la importancia de las actividades CTS y el papel de la evaluación o el uso de recursos como los physlets en el proceso de enseñanza y aprendizaje de la relatividad. Los análisis cualitativos, la emision de hipótesis de los alumnos y la comunicación de éstos adquieren un carácter relevante en esta propuesta.In this paper we argue in favor of keeping the introduction to the study of relativity in high school education. Deficiencies in the traditional teaching of the subject are noted and the basic characteristics of an alternative proposal are exposed. Also, some activities of the suggested teaching-guide are presented, with a special emphasis on the definition of 4-vectors, the use of space-time and momentum-energy diagrams, and also the concept of invariant mass. The importance of including CTSE activities and the role of the evaluation are also emphasized, as well as the use of resources such as «physlets» in the process of teaching and learning relativity. Qualitative analyses, hypotheses put forward by the students and the discussion of these achieve a relevant role in the proposed scheme
Alambique : didáctica de las ciencias experimentales
No full textSe presentan materiales para la introducción de la relatividad en el bachillerato tales como un curso de formación docente, un libro, una unidad didáctica, una presentación en Power Point y una colección de animaciones informáticas construidas con el programa de libre distribución Modellus, que se enlazan con los conceptos tratados materiales anteriores. La propuesta sigue la orientación de enseñanza por investigación, la cual considera que para que el alumnado pueda elaborar nuevos conocimientos los contenidos deben ser significativos, han de resultar relevantes y han de tener correspondencia con su entorno. Dentro de esta orientación se plantea una enseñanza problematizada de la relatividad, de tal modo que un gran problema científico dirige y orienta la estructura del tema entero.Universidad de Valladolid. Biblioteca de la Facultad de Educación y Trabajo Social; Campus Miguel Delibes. Paseo Belen, 1 s. n.; 47011 Valladolid;ES
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