1,721,003 research outputs found
Lithospheric Tectono-Dynamics of the Balearic Basin opening from CROP-ECORS seismic data
No full textWe reconstruct the structure and geodynamics of the Balearic basin based on deep seismic reflection data from the CROP and CROP-ECORS projects. An interpretative processing (IP) sequence and innovative velocity filtering techniques were exploited to reprocess most of the CROP seismic lines from the area, and to enhance deeper crustal events. The resulting good quality data now image the slab of the Alpine-Tethys oceanic crust, subducted in the Balearic stage (Oligocene–Lower Miocene). Such an interpretation supports the idea that rotation of the Corso-Sardinia block in the Balearic geodynamic stage was driven by W-dipping subduction of the Alpine-Tethys lithosphere. In all the seismic sections examined in this work, the rift tectonics of both the margins of the Balearic Basin and the ocean–continent boundary are well evident
CROP seismic data acquisition, processing and interpretative reprocessing
No full textThe CROP dataset encompasses nearly 10,000 km of seismic sections. The marine part (8687.15 km) was performed from 1988 to 1995 by the RV OGS-Explora with an 80.4 liter airgun array and a 4500 m long, 180-channel streamer. The basic processing sequence focused on amplitude correction, multiple removal, deconvolution, velocity analysis, stacking, post-stack migration and time-variant filtering. Part of the marine dataset was re-processed to improve multiple attenuation, deep signal-to-noise ratio and imaging of structurally complex sectors. A proprietary Hough-transform-based algorithm was exploited to attenuate multiple events. Computation of instantaneous attributes by means of wavelet transform improved identification of weak signals in noisy background from deep crustal reflectors. Pre-stack imaging exploited the feedback from the interpretation phase to iteratively refine velocity–depth models and obtain optimum focusing of primary events. The latter interaction between processing and interpretation was the basis for the successful implementation and application of an interpretative strategy for deep crustal seismic data reprocessing
The Medinet Madi archaeo-geophysical project: recent advancements in non-invasive technologies for the high resolution subsurface imaging of archaeological sites
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REVIEW OF THE MAIN RESULTS OF THE PIONEERING MS SEISMIC EXPLORATION PROGRAMME IN THE DEEP WATER OF THE MEDITERRANEAN SEA (OGS, 1969-1980)
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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
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