1,721,035 research outputs found
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
Introduccion
No full textIntroducción al volumen editado en donde se presentan los diferentes contribuíos y sus enfoques teórico-metodológicos
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
Arqueología de la Selva El Ocote, Chiapas
No full textEl texto “Arqueología de la Selva El Ocote, Chiapas” constituye la más amplia y detallada síntesis en lengua castellana de los trabajos desarrollados hasta la fecha por el Proyecto Arqueológico Río La Venta en el oeste de Chiapas. El texto discute tanto los temas relativos a las oleadas de colonización de la selva El Ocote en la época prehispánica, así como los datos relativos a la utilización de las cuevas de la región como recintos rituales en donde se desarrollaban actividades rituales relacionadas con los dioses del agua y de la fertilidad
Fluorescence determination of the specific interaction between labeled IgG and patterned protein on silicon for CMOS-based biosensing
No full textPiezoelectric properties and dielectric losses in PVDF-PMMA blends
No full textPiezoelectric properties and dielectric losses have been measured in polyvinylidene fluoride (PVDF)/polymethyl methacrylate (PMMA) blends to assess the value of this class of polymers as ultrasonic transducer materials. The electromechanical coupling factor k(t) has been found to become vanishingly small in blends having a PMMA content of about 20% by weight. For the same blend composition, the peak of dielectric losses, which at room temperature is located in the low megahertz range, decreases only by 20%. For low PMMA content blends at room temperature, the slow decrease of dielectric losses and the slight frequency shift of the loss peak in the megahertz region are ascribed to the presence of two conjugate amorphous phases. This structure prevents much stronger effects on dielectric losses which could be expected from blending PVDF with a polymer having a high glass transition temperature, such as PMMA. PVDF-PMMA blends, therefore do not represent an attractive class of ultrasonic transducer materials
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