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The spatial structure of the downward momentum flux on sea derived from a SAR image
No full textThe spatial structure of the atmospheric surface layer over the sea has been investigated through a radar image taken by an airborne Synthetic Aperture Radar (SAR) at C-band (5.3 GHz) and wind stress data recorded on board of the C.N.R. research platform located in the northern Adriatic Sea. The SAR image shows quasi-ordered structures of radar backscatter hundreds of meters long, while the wind stress time series are characterized by the well known intermittent bursts of tenth of seconds. A conditional sampling technique has been applied both to the wind stress time series and the SAR image, to get the mean structure of the downward momentum flux and the one and two dimensional shape of the structures of the image. It has been shown that a part of the backscatter structures represents the imprint of the downward wind stress. They appear like microfronts, 50 m wide in the up-downwind direction, elongated in the crosswind direction. The crosswind size is in average four times larger than the up-downwind one. The downward wind stress structures cover the 13% of the total area
Slicks detected by measuring damping effect on short gravity waves using a microwave probe
No full textCaratterizzazione della superficie del mare e riconoscimento delle sostanze tensioattive mediante telerilevamento a microonde
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Osservazioni della superficie marina con tecniche radar per l’estrazione dei parametri meteo-oceanografici
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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
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