1,720,954 research outputs found
Channels, echo character mapping and tectonics from 3.5kHz profiles, distal Bengal Fan
No full textThe distal parts of the Bengal Fan are spectacularly affected by tectonic deformation related to the diffuse plate boundary between the Indian and Australian plates. Here we use 3.5kHz and 12kHz echosounder profiles, seismic reflection profiles and piston core results to examine sedimentary processes and their relationships to tectonism within an area (78º-82ºE, 0º-6ºS) just to the south of Ocean Drilling Program Leg 116 sites.Echo character mapping was completed using echosounder data in conjunction with results from piston coring, and a total of five different echo types have been recognised. Four of these fall into the echo character classification scheme developed by Damuth (1980a), whilst the fifth is believed to represent hemiturbidite deposits. Several types of submarine channel were also identified from echosounder data and a correlation between echo type and channel location can be seen. Their abundance, erosional and/or depositional nature together with a complex meandering and bifurcation pattern across a wide region of average gradient around 1/km, are all features characteristic of a broad channel termination zone on a large elongate fan. It is clear, therefore that the Bengal Fan extends beyond 6ºS.Active faulting in the area has led to the development of an irregular topography of low rounded hillocks that interfere with incoming turbidity currents. This has resulted in ponding between highs rather than lobe construction, thinning and pinching out of turbidites against the flanks of local relief, flow lofting and hemiturbidite drape, and common small-scale slumping. In some cases uplifted channel segments can be seen abandoned and partially filled. <br/
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
THE STRUCTURE AND DYNAMICS OF A CONVERGENT ESTUARINE FRONT
Full text linkThis thesis considers the structure and dynamics of a convergent front, which forms at the confluence of the Tamar and Lynher rivers during the ebb tide, in the Tamar Estuary, South West England. Temperature, salinity and velocity were sampled at high frequency in the region of frontogenesis, and these data are used to assess the evolution and development of a front during the course of an ebb tide. The equation of continuity and the horizontal equations of motion are applied to the data set in order to evaluate the dynamic regime operating in the vicinity of the front, and its spatial and temporal variation. Mixing within the region is appraised from a consideration of the vertical eddy viscosity and diffusivity, and the gradient Richardson number. Results suggest that the evolution of the front occurs in two distinct stages; the first being the formation of a convergent, near-horizontal interface between denser Tamar water flowing south-westwards, and less dense Lynher water flowing south-eastwards, such that this first stage can be described as a plume front. The interface has an increased degree of shear-induced turbulence and vertical mixing associated with it. In the later stages of the ebb tide, the front evolves into a turbulent, buoyant jet of Lynher water which extends over most of the area surveyed, and the less turbulent Tamar water is entrained into the Lynher jet. In both the longitudinal and lateral directions, the Lynher flow is found to be primarily accelerated by the barotropic pressure gradient, whereas the Tamar flow is mainly accelerated baroclinically. A markedly more variable and complex dynamic regime in the lateral direction appears to be influenced by daily variations in fresh water run-off and tidal range to a greater extent than the longitudinal dynamics
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