1,720,958 research outputs found
Deflection of the progradational axis and asymmetry in tidal seaway and strait deltas: insights from two outcrop case studies
No full textDeltas represent the major sediment source for tectonically confined, tide-dominated
seaways or straits. Modern examples show how along-shore tidal currents are able to modify the
impinging delta shape, generating asymmetrical coastal plains, deflected delta fronts and elongate
sandbanks. Seaway or strait deltas can become become tide-influenced or tide-dominated, assuming
physical attributes that may depart from classical models. Ancient deltas in seaways and straits
can also reveal unexpected facies stacking and stratigraphies, which can be misinterpreted or attributed
to different depositional settings. Two ancient analogues of deltas that prograded into elongate
basins dominated by amplified tidal currents are presented here. A common element in these deltas
is the progressive-upwards change in the dominant process of sediment dispersion recorded in the
delta facies. Early stages of progradation are dominated by river- and wave-influenced lithofacies,
whereas late deltaic advancements occur with a dominance of tidal current circulation on the delta
fronts and the consequent morphologies are deflected/elongated in the direction of tidal flow. This
study provides the basis for a preliminary stratigraphic framework for the depositional style of
these types of delta. The studied deposits also suggest analogies with the spatial distribution of
many hydrocarbon reservoirs investigated along the margins of confined, narrow, linear basins,
the interpretation of which is still debated
Tidally influenced shoal water delta and estuary in the Middle Jurassic of the Søgne Basin, Norwegian North Sea: sedimentary response to rift initiation and salt tectonics
No full textRecent studies in the Middle Jurassic Bryne and Sandnes formations, primary reservoirs
in several fields across the Norwegian and Danish North Sea, show the widespread occurrence
of tidal-influenced and tide-dominated deposits. Aalenian–Bajocian Bryne cores reflect deposition
by a shoal water, tidally influenced delta onto a low wave energy tidal platform (both supratidal and
intertidal) that probably occupied the majority of the Søgne Basin, a narrow rift system connected
to the Central and Danish graben and transgressed from an open-marine basin, possibly located to
the south. At the Bathonian–Callovian boundary, a new phase of rifting and progressive salt movements
led to the deposition of the upper Bryne and Sandnes formations within an 80–100 km long
composite estuarine valley. Basin tilting to the south and continued transgression resulted in tidal
deltas that offlap the northern margin of the basin. The basin was fully transgressed by the end of
the Callovian. From the Late Bathonian onwards, differential tectonic movements along the
broadly interconnected Middle Jurassic rift basins led to a change in the transgression direction
from south to north, with an open-marine basin located in the Central and Viking graben
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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