1,721,067 research outputs found
Triassic climates - State of the art and perspectives
No full textThe climate of the Triassic period was characterized by a non-zonal pattern, dictated by a strong global
monsoon system with effects that are most evident in the Tethys realm. This strong monsoonal regime is
related to the aggregation of the Pangaean supercontinent, which by Triassic time was already completed.
Climate oscillations existed within this framework. The harsh hot-house climatic conditions that
characterized the Late Permian, and perhaps precipitated the end-Permian mass extinction, were probably
maintained during the Early Triassic and may account for the impoverished, but distinctive, faunal and floral
Lower Triassic associations. Although metazoan reef builders were probably the most affected group,
carbonate production remained high at least in the western Tethys realm. The Middle Triassic was
characterized locally by humid episodes, although their geographical distribution has yet to be clarified. The
Carnian Pluvial Event, marks an episode of increased rainfall documented worldwide, was the most
distinctive climate change within the Triassic. Different hypotheses have been proposed for its causes:
changes of atmospheric or ocean circulation driven by plate tectonics; a peak of the global monsoon due to
maximum continent aggregation; or triggering by the eruption of a large igneous province. Subsequently, the
late Carnian and Norian seem to have been climatically stable, although minor climatic changes have
recently been described even from this time period. Finally, the end-Triassic extinction event is also
associated with climate change, specifically warming and increased rainfall, but this evidence comes mostly
from the northern parts of the Central Atlantic Magmatic Province, and the global pattern of climate change
at the Triassic/Jurassic boundary has still to be resolved. Many facets of Triassic climate are intriguing and
deserve further research. However, palaeoclimate studies on the Triassic have so far been carried out only
locally with different proxies. Those proxies will require inter-calibration, in order to depict correctly the
temporal and geographical patterns of Triassic climate
Evolving Depocentre and Slope
No full textThe Gull Island Formation is the uppermost lithostratigraphic unit of the Namurian Shannon Group and is best exposed on the Atlantic coast of southern and northern County Clare. This chapter presents excursion summaries and builds upon published observations and interpretations of the Gull Island Formation, with an emphasis on the stratigraphic architecture at several key outcrops, including those at Gull Island, Fisherstreet Bay and the Cliffs of Moher. It describes outcrops in the south and north of County Clare, where the varied nature of the Gull Island Formation can be viewed in a series of spectacular cliff sections. This review and field excursions has unearthed some lost data that has enabled refinement of the understanding of the formation. The base of the Gull Island Formation is a diachronous boundary between the coeval Ross Sandstone and Clare Shales, which was initiated in the SW and migrated north and east with time.http://onlinelibrary.wiley.com/book/10.1002/978111925714
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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