1,720,980 research outputs found
Benthic foraminiferal trends in relation to an organic enrichment gradient on the continental slope (850 m water depth) off North Carolina (USA)
No full textWe analyzed benthic foraminiferal assemblages in core samples collected by a submersible at three sites (I, II, III) along an isobathyal gradient of organic enrichment on the North Carolina slope (850 m water depth). The 0–2, 2–5, 5–10, 10–15 cm layers of each core were sieved into 63–125, 125–150 and 150–300 µm size fractions, and each fraction was stained with rose Bengal and dry sorted. Together, the samples yielded 284 benthic foraminiferal species. The vast majority of tests (97%) were unstained; live specimens were scarce at Site I and very rare at Site II, but more common at Site III. The preservation of dead calcareous benthic and planktonic foraminiferal tests varied between sites. Calcareous tests were abundant at Sites I and II, but virtually absent at Site III except in the 2–5 cm layer, where they were more numerous than at the other two sites. Dead benthic tests were also less abundant in the 0–2 cm, 5–10 cm and particularly the 10–15 cm layers at Site III than in the corresponding layers at Sites I and II, and were dominated by species with agglutinated rather than calcareous walls. These patterns suggest that substantial dissolution has occurred at Site III. In striking contrast, the 2–5 cm layer of our Site III core yielded numerous calcareous planktonic and benthic foraminiferal tests. Possibly, this layer consisted of sediment that had been transported by a local mass movement event. In general, diversity trends exhibited by the dead assemblages (63–300 and 63–125 µm fractions) were similar to those reported by Gooday and others (2001) for the live metazoan and foraminiferal macrofauna (>300 µm): diversity and species richness were higher at Sites I and II than at the organically enriched Site III; dominance was higher at Site III than at the other two sites. However, at Site III, diversity was apparently depressed by the destruction of calcareous foraminiferal tests. Some species (Angulogerina angulosa, Bolivina paula, Bulimina aculeata, Cibicidoides pseudoungerianus, Globocassidulina subglobosa, Rosalina floridana and Stetsonia minuta) were common to all three sites. However, the most abundant species (Bolivina spissa, Eggerella advena, Paratrochammina ?bartrami, Veleroninoides jeffreysii) at Site III were different from those at Sites I and II, among both the live and dead assemblages. The common species (e.g., Eggerella advena) at Site III are more typical of shallow-water, inner shelf settings, a result that is consistent with published observations on metazoan macrofauna (>300 µm) at similar depths on the slope off Cape Hatteras
Wall structure and test morphology in three large deep sea agglutinated foraminifera, Rhabdammina parabyssorum Stschedrina 1952, R. abyssorum Sars 1869 and Astrorhiza granulosa (Brady, 1879) (Foraminiferida, Textulariina)
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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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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