1,720,992 research outputs found
Multi-scale influence of topography on shallow-marine successions associated with long-term transgressions: from Argentinean outcrops to the Norwegian shelf subsurface
No full textThick shallow-marine successions associated with longterm transgressions are less well known than their thin, well-sorted counterparts, more widely studied due to their potential to form good reservoirs. In these successions, particularly in storm-dominated examples, bioturbation can obliterate primary sedimentary characteristics, making stacking patterns and sequences difficult to define, and challenging our understanding of the main controls in their resulting depositional architecture.Fil: Poyatos Moré, Miquel. University of Oslo; NoruegaFil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Boya, Salvador. Universidad de Barcelona; EspañaFil: Gomis Cartesio, Luz Elena. No especifíca;Fil: Midtkandal, Ivar. University of Oslo; Noruega34th Geological Winter MeetingTrondheimNoruegaGeological Society of Norwa
Architecture and controls of thick, intensely bioturbated, storm-influenced shallow-marine successions
Get PDFThick (100 m), highly bioturbated storm-influenced shallow-marine deposits are not common in the stratigraphic record, but some examples have been described in aggradational to retrogradational successions. In these, individual event beds have typically low preservation potential, yet shoreface-offshore depositional settings are still largely characterized based on the inferred frequency or magnitude of storms. Here we present a sedimentological study of a thick, bioturbated exhumed succession deposited during the early post-rift phase of the Neuquen Basin (Argentina). We characterize it and compare its stratigraphic record with examples elsewhere, in order to discuss the potential factors controlling the total overprint of storm-event beds during several million years.Fil: Poyatos Moré, Miquel. University of Oslo; NoruegaFil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Boya, Salvador. Universidad de Barcelona; EspañaFil: Gomis Cartesio, Luz Elema. Equinor S. A.; NoruegaFil: Midtkandal, Ivar. University of Oslo; Noruega59th British Sedimentological Research Group Annual General MeetingReino UnidoBritish Sedimentological Reseach GroupUniversity of Liverpoo
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Multi-scale influence of topography on depositional architecture of long-term transgressive successions (Jurassic, Neuquén Basin, Argentina)
No full textShallow-marine successions deposited during long-term transgressions are considered to develop relatively thin and well-sorted deposits. Thick transgressive successions are rarely preserved in the stratigraphic record, although a few examples are described in subsurface and outcrop studies of rift basins. In these settings, reworking by active shelf processes and biogenic activity often result in partial or complete destruction of primary sedimentary structures; bed boundaries and geometries might become homogenized, and stacking patterns and stratigraphic sequences more difficult to define. In this study, an outcrop example from the Lower-Middle Jurassic of northern Neuquén Basin (Argentina) is presented, with the aim to a) refine the depositional model of a longterm transgressive succession in an early post-rift setting; and b) to constrain controls on stratigraphic architecture and lateral facies variability, and their response to postdepositional processes. To do this, a 10 km continuous exposure, with detailed mapping, sedimentary logging and physical correlation of stratigraphic units, integrated with subsurface, biostratigraphic and ichnological data. The succession shows an overall retrogradational fining-upward development, with severalminor order regressive units. The lower part of the succession comprises laterallydiscontinuous (10´s m-long), coarse-grained transitional deposits, dominated by 10´s m-thick coarsening-up packages and discrete m-scale erosive conglomeratic lenses, interpreted asmouth-bars and distributary channel-fills. Above these, the middle and upper parts of thesuccession cover the entire length of the outcrop (>4.5 km) and thicken gradually southwards, although subsurface data reveals a fault-controlled, limited regional extension.They comprise laterally-continuous (>100´s m-long) fine-grained shallow-marine deposits, dominated by <1m-thick fine-grained structureless and highly bioturbated tabularmuddy sandstones and sandy mudstones, with locally-preserved HCS and bioclastic-richlevels. They are interpreted as storm-dominated lower-shoreface to upper-offshoredeposits. Internal characteristics and bed boundaries are diffuse due to pervasivebioturbation, suggesting recurrent periods of seabed exposure, oxygenation and colonization of organisms.The coarse-grained nature and lithology of the lower part of the succession are consistentwith a proximal sediment source, likely associated with erosion of intra-basinal highs. Itsvariable thickness and lateral distribution, and the marked onlap termination against theunderlying syn-rift deposits, demonstrates the partial infill of localized higheraccommodation areas. Above this, the middle and upper parts of the succession are more extensive, and display well-defined parasequences internally composed of tabular, laterallycontinuous bedsets (<5 m-thick), still preserving original stacking patterns. However, the vertical thickness variability of parasequences in their overall retrogradational pattern is interpreted to reflect the stratigraphic response of a transgression over a larger-scale rampstep and underfilled rift topography. The overall good sorting and fine-grained nature of sandstones indicates a mature, distal source of sediment, which was redistributed alongshore by storm/wave-dominated processes, and accumulated in inherited post-rift depocentres, where intensive biogenic reworking was favored. This study offers new insights in how lo interpret transgressive systems based on both primary depositional mechanisms and postdepositional processes, and provides useful tools lo understand and predicithe nature and potential preservation of these deposits in limited subsurface datasets, especially in the syn-rift lo early post-rift transition.Fil: Poyatos Moré, Miquel. University of Oslo; NoruegaFil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Boya, Salvador. Universidad de Barcelona; EspañaFil: Gomis Cartesio, Luz Elena. No especifíca;Fil: Midtkandal, Ivar. University of Oslo; Noruega34th International Meeting of SedimentologyRomaItaliaInternational Association of Sedimentolog
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
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