1,720,984 research outputs found
Architectural style and facies distribution of channel and channel-lobe transition zone in the Lower Messinian turbidite systems of Laga Basin (central Apennines, Italy)
No full textFacies and geometries of Lower Messinian Laga Basin turbidite deposits (central Apennines, Italy)
No full text[No abstract available
NATURAL DISASTER RISK PREPAREDNESS AND MITIGATION GUIDELINES OF CULTURAL HERITAGE SITES OF ALBANIA (Part I)
Full text linkFacies and architecture of the Lower Messinian turbidite lobe complexes from the Laga Basin (central Apennines, Italy)
No full textTurbidite depositional lobes are the main architectural element of many ancient turbidite systems. On modern submarine fans, they constitute sandy accumulations with lobate planform forming as terminal splays at channel mouths. Several outcrop, marine geology and experimental studies have documented how facies, depositional geometries, and overall architecture of turbidite depositional lobes can be largely controlled by the host basin morphology. This study investigates the architecture of turbidite lobe complexes from the Southern Laga Basin (SLB; central Apennines, Italy) basing on detailed bed-by-bed correlations. During the Early Messinian, the SLB was part of a quickly deforming sector of the Apennine foreland basin system and hosted the deposition of a thick turbidite succession. The SLB's size and morphology were controlled by the balance of tectonics and sedimentation. In such a context, SLB's depositional lobes were topographically confined in an N-S trending dead-end trough delimited by thrust-related anticlines. Eventually, as turbidite sedimentation progressively smoothed out the seafloor morphology up to allow depositional lobes spilled to the E over the more external anticline.. Strike and dip sections across depositional lobes on an approximately 1700 m thick interval from the SLB's Lower Messinian, enabled us to describe and compare the depositional architecture of turbidite complexes with different degree of basin confinement. Three main lobe sub-settings were recognized: i) a channel-lobe transition sector, where through-cross bedded and massive-to-crudely laminated beds form composite sandstone bodies which thicken down current; ii) a proximal lobe sector, where crudely laminated to planar-parallel laminated medium-fine sandstones constitute amalgamated to non amalgamated beds thinning out relatively rapidly down and across current; iii) an intermediate to distal (lobe fringe) sector characterized by deposition of thin-bedded turbidites, occasionally intercalated by debris-flow and slumping deposits. The comparison of depositional shapes revealed the dependency of sandstone body lenticularity on thickness (and, imlplicitly, depositional hierarchy), lobe sub-setting and degree of topographic confinement. At a higher hierarchical scale, the role of topographic confinement was even more important and brougth about two distinctive architectures of lobe complex. Confined stratigraphic complexes show a sheet-like architecture where compensation process is unimportant and lobes gently pinch and shale out toward basin margins, whilst unconfined ones are characterized by compensational stacking of lobes and a rather intricate facies distribution. Finally, the basin-fill scale architecture of SLB lobes was controlled by the interplay of thrusting and turbidite sedimentation, which modulated the degree of topographic confinement and caused the progressive eastward shift of the depocentre
A COMBINED MINERALOGICAL AND SEDIMENTOLOGICAL APPROACH TO DIFFERENTIATE TURBIDITE MUDSTONES
No full textFacies and processes from the confined Salto-Tagliacozzo Basin (Messinian, Central Apennines, Italy)
No full text
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
- …
