1,720,979 research outputs found
Straits and seaways: end-members within the continuous spectrum of the dynamic connection between basins
Full text linkLocation of the straits and seaways plotted in Figure 2 and the data used to build Figure
Palaeostrait tectonosedimentary facies during late Cenozoic microplate rifting and dispersal in the western Mediterranean
Full text linkPalaeostraits are common features formed during the extension and fragmentation of active continental
margins, when back-arc basins are formed and microplates develop through upper-plate extension. In
this contribution, we focus on narrow seaways and straits associated with successive pulses of late Cenozoic
rifting along the southwestern Eurasian continental margin, and the ensuing formation and dispersal of microplates.
The incomplete and largely non-cylindrical Africa–Eurasia continental collision in the Mediterranean
region provides snapshots of the various phases of microplate fragmentation and dispersal, punctuated by
the presence of narrow seaways/straits. These peculiar physiographical conditions induced current amplification,
and led to the accumulation of characteristic large-scale, cross-stratified deposits and tidal facies in an otherwise
generally microtidal setting. Although not univocally related to rifting, the identification of such
distinctive sedimentary facies within deformed orogenic belts may ultimately help in terrane analysis and in
the discrimination of individual microplates, which were then amalgamated. Recognition and dating of palaeostrait
tectonosedimentary facies can thus constrain the presence and the onset of extension in the geological
record
Deformed cross-stratified deposits in the early Pleistocene tidally-dominated Catanzaro strait-fill succession, Calabrian arc (southern Italy): Triggering mechanisms and environmental significance
Full text linkThe Early-Pleistocene Catanzaro strait-fill succession consists of large-scale tidal sets, accumulated in a
tectonically confined basin during a phase of rapid relative sea-level rise. It crops out mainly in the presentday
Catanzaro Trough where numerous field sections supported the characterization of the vertical and lateral
facies variations and the documentation of a variety of soft-sediment deformation structures, exposed throughout
their vertical and lateral extents. The soft-sediment deformation structures (SSDS) are the result of liquefaction
and fluidization processes that deformed cross-laminations and other primary structures into folds, fluidescape
structures, and structureless expanses. Three different groups of SSDS have been documented in the
cross-stratified deposits of the Catanzaro strait. The detailed description of these soft-sediment deformation
structures in a depositional context established by facies analysis enables interpretation in terms of possible
trigger mechanisms. Consistent relationships between the occurrence of distinctive SSDS and specific tidally
dominated facies have been established, indicating a probable autogenic origin for the soft-sediment
deformations. Liquefaction and fluidization features are interpreted as the result of increases in water porepressure,
induced by overloading. In particular, two types of overloading agents are hypothesized, which affect
the lee and stoss sides of the migrating dunes in distinct events, and inducing the deformation of foreset laminae
or sets of cross-strata, respectively
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
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