1,721,021 research outputs found
Textural and mineralogic characteristics of sediment cores from mud volcanoes on the Calabrian Arc, Northern Ionian Sea.
No full textTectonically-driven mud volcanism since the late Pliocene on the Calabrian accretionary prism, central Mediterranean Sea
No full textActive tectonics in the Calabrian Arc: Insights from the Late Miocene to Recent structural evolution of the Squillace Basin (offshore eastern Calabria)
No full textThe Calabrian Arc represents one of the most active sectors of the upper plate of the Tyrrhenian-Ionian subduction
system. This research aims to reconstruct the evolution of the Squillace Basin (Ionian offshore of the
Calabrian Arc) from the Late Miocene to Recent times and recognise active shallow and deep structures using a
multiscale approach. The latter is based on interpreting high-penetration and high-resolution seismic reflection
profiles, calibrated with well-log data coupled with bathymetric data and the distribution of instrumental
earthquakes. Data highlight three steps in the evolution of the Squillace Basin. A Late Miocene extensional event
led to the formation of WNW-ESE oriented horst and half-graben structures. During the Pliocene, deformation
was localised in the central and northern sectors of the basin and expressed by a WNW-ESE oriented strike-slip
fault and NW-SE normal to trastensional faults, respectively. A transpressional event started in the Early Pleistocene,
causing the positive inversion of deep (> 3 km) extensional faults and the formation of NW-SE to WNWESE
oriented transpressional/reverse faults and related anticlines. The kinematics of these faults agree with the
NW-SE oriented left-lateral Albi-Cosenza, Lamezia-Catanzaro and Petilia-Sosti crustal fault zones developed in
north Calabria. The results of this work suggest that the transpressional structures in the northwestern sector of
the basin likely represent the offshore prolongation of the Albi-Cosenza fault zone. NW-SE to WNW-ESE trending,
shallow (<2 km) high-angle normal faults offset the younger deposits. Their depth and direction indicate that
these faults are secondary structures formed in the extrados of the anticlines associated with the transpressional
faults. The distribution of earthquakes shows events with M > 3 and depth <15 km located in the hanging wall of
transpressional faults. The integrated data suggest that these structures are active and probably responsible for
the major earthquakes that affected the Ionian offshore
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
Methane Seepage on Mars: Looking for analogues from submarine fluid flow systems on Earth
No full textMethane Seepage on Mars: Looking for analogues from submarine fluid flow systems on Eart
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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