1,721,020 research outputs found
Isotopic composition and tritium activity of atmospheric precipitation in northern Italy
No full text
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
THERMAL AND GEOCHEMICAL INVESTIGATIONS ABOUT SOME ICE WEDGES OF NORTHERN VICTORIA LAND (ANTARCTICA)
No full textDuring the XIV, XVI and XIX Italian Antarctic Expeditions geomorphologic surveys of permafrost-related polygons were carried out in the northern Victoria land. Ice wedges were found in sites with different altitudes and climatic conditions in a vast area extending from the Terra Nova Bay up to Freyberg Mountains.
All the samples were measured for their oxygen isotope ratios and in some cases a co-isotopic study was performed. Tritium activity measurements were also carried out.
Ice-wedge thermal regime monitoring at two selected sites showed high temperature gradients between the ground surface and the top of ice wedge
Thermal and geochemical investigation of ice wedges in northern Victoria Land (Antarctica)
No full textDuring the 1998-1999, 2000-2001 and 2003-2004 field seasons, geomorphological surveys of permafrost-related polygons were carried out in northern Victoria Land. Widespread diffusion of ice wedges was ascertained. The ice wedges were found at depths ranging from 10 cm to 74 cm from the ground surface. Their size ranged from 5-7 cm to 155 cm in width, with an average of 49 cm at the top, and from 20 cm to over 150 cm in height, with an average of 85 cm. The wedge ice was milky-white in colour and largely free of sediment, with numerous oriented gas inclusions forming vertical foliations. A vertical open fissure, 2-5 mm wide and filled with small loose ice grains, was present at the centre of most ice wedges and extended down to the bottom of the wedge or to the bottom of the excavated section. The study investigated the thermal regime and stable-isotope composition of selected ice wedges. The aim was to establish whether thermal conditions trigger ice-wedge cracking and to define the processes which lead to the formation of wedge ice
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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