1,721,001 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
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
Dipturus sp. l
No full textDipturus sp. L (sensu Last and Stevens, 1994 as Raja sp. L) - Maugean skate (Fig. 5) Distribution Recorded from two separate estuaries on the west coast of the Tasmanian land-mass (Bathurst Harbour and Macquarie Harbour). Most common in waters of about 5 m depth (Last and Stevens 1994). Description Egg case medium to large, rectangular (Table 1); colour green or brown, almost transparent; dorsal and ventral surfaces with few fine fibroids; lateral keel> 15% maximum width; attachment fibres absent. Anterior region not described as specimens collected were only three quarters developed; body length of a complete specimen would possibly be> 90 mm. Posterior horns relatively long, length> 30 mm; posterior apron long, sub-equal in size to posterior horns; apron fringed, delicate.Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on pages 61-6
Dipturus sp. a
No full textDipturus sp. A (sensu Last and Stevens, 1994 as Raja sp. A) - Longnosed skate (Fig. 3) Distribution Found in New South Wales, Victoria and Tasmania in depths from 40-250 m (Last and Stevens 1994). Description Small, squat/broad, round in shape (Table 1); colour brown/yellow, transparent; ventral surface almost flat, dorsal surface convex. Ventral surface smooth with very few fine fibroids; dorsal surface with fine fibroids. Lateral keel broad, ≥ 5 mm in width on each side. Attachment fibres very fine, located on lateral margin; posterior and anterior horns depressed, short; both aprons short, posterior apron length slightly> anterior apron length.Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on page 5
Dipturus sp. b
No full textDipturus sp. B (sensu Last and Stevens, 1994 as Raja sp. B) - Grey skate (Fig. 4) Distribution Found in waters off New South Wales, Tasmania, South Australia, and Western Australia. Most abundant at depths of 450-600 m, but recorded over depths of 330-950 m (Last and Stevens 1994). Description Egg case medium to large, slightly rounded in shape (Table 1); colour golden, may have a green tinge. Fibroids thick, present on both dorsal and ventral surfaces; lateral keel> 9% maximum body width. Attachment fibres prominent on lateral margin; tendrils extending from posterior horns. Anterior horns slightly longer than posterior horns, horns depressed, narrow. Anterior and posterior aprons fully extended, similar in length (> 15% of BL).Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on page 6
Amblyraja hyperborea
No full textAmblyraja cf hyperborea - Boreal skate (Fig. 2) Distribution Widely distributed throughout temperate parts of the Atlantic, Pacific and Indian Oceans. Occurs in depths to 2500 m. Fairly common in southern Australian (particularly off Tasmania) and New Zealand waters, occurring in depths of 1300-1500 m (Last and Stevens 1994). Description Egg case large, broad, rectangular (Table 1); colour dark brown; narrower at posterior end. Ventral side fairly flat; dorsal and ventral sides covered with fine fibroids. Lateral keel> 20% maximum width. Attachment fibres absent; posterior horns depressed,> BL, tapering out to fine hairs. Anterior horns short; posterior apron length> 25% BL. Anterior apron length <posterior apron length.Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on page 5
Pavoraja nitida
No full textPavoraja nitida (Günther, 1880) - Peacock skate (Fig. 10) Distribution Found in New South Wales, Victoria, Tasmania and South Australia in depths from 30-390 m (Last and Stevens 1994). Description Egg case very small (Table 1), round in shape; colour fawn/brown. Dorsal and ventral surfaces with fine fibroids; lateral keel absent; attachment fibres present on lateral edge. Horns very long at posterior end, length> 5 cm, taper to fine hairs; anterior horns short, curving at tips. Anterior apron very short may be up to one third smaller than posterior apron.Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on page 6
Dipturus cerva Whitley
No full textDipturus cerva Whitley, 1939 - White-spotted skate (Fig. 6) Distribution Found in New South Wales, Victoria, Tasmania, South Australia and Western Australia, in depths of 20-470 m (Last and Stevens 1994). Description Egg case small, round in shape (Table 1); colour fawn/brown. Dorsal and ventral surfaces with thick fibroids; lateral keel absent. Attachment fibres prominent on lateral margin; horns fairly short, roundish, similar in length at both posterior and anterior ends. As egg case becomes narrower, apron becomes more pronounced at posterior end.Published as part of M. A. Treloar, L. J. B. Laurenson & J. D. Stevens, 2006, Descriptions of rajid egg cases from southeastern Australian waters., pp. 53-68 in Zootaxa 1231 on pages 62-6
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