1,721,029 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
The Role of Gravity Modeling in Seismotectonics Analysis
No full textAbstract
(max. 250 words) The integration of surface geological investigations with geophysical techniques is useful to characterize systems of active faults, whose anatomy is often complex. Integration of different geophysical methods has a key-role in yielding information on the underground geometry of the systems.
We use an integrated analysis of geo-structural, seismological and gravimetric data and focus on the identification and geometrical description of faults, with associated density contrast, both at the surface and at depth. At the surface, this task is accomplished by a Multiscale Derivative Analysis (MDA) of the Bouguer anomaly map and by the integration of the MDA maps with the epicentral distribution and all the available geological information. The characterization of fault structures at depth is instead performed by the combination of the Depth from Extreme Points (DEXP) gravity imaging method with the hypocentral sections.
Our multi-parametric approach was effectively applied to different seismically active regions of the Central Apennines, such as the area hit by the 2016-2017 Amatrice-Visso-Norcia seismic sequence (Central Italy) and the area of San Giuliano di Puglia (Southern Italy), struck by a moderate earthquake in October 2002
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Processing and interpretation procedures of onshore recording of “Crop mare 2” NVR line m-30
No full textCharacterization of the San Giuliano di Puglia (Southern Italy) Active faults through the Analysis of geological, seismological and gravimetric data
No full textThe area of San Giuliano di Puglia (Southern Italy) was struck by a moderate earthquake of Mw=5.7 on October 31st, 2002. The aim of this study is to identify and constrain the geometry of the active structures in the area. We used an integrated analysis of geo-structural, seismological and gravimetric data in GIS environment.
More specifically, we built three thematic databases: the “fault dataset” consists of the collection of tectonic structures extracted from different catalogues and scientific papers; the “earthquake dataset” contains the instrumental and historical earthquakes extracted from the available catalogues; the “gravimetric dataset” consists of lineaments identified by the Multiscale Derivative Analysis (MDA) maxima of the Bouguer anomaly map. The maxima of the MDA map highlight lineaments contacting lithologies with different density. A table of attributes associated with each type of data was created ad-hoc.
Our analysis of the three thematic datasets at San Giuliano di Puglia showed a clear correlation between MDA lineaments and low-angle NW–SE thrust lineaments. Furthermore, there is a good correlation between the E–W re-localized San Giuliano di Puglia 2002 seismic sequence and a MDA maximum with E–W direction, without evidence of E–W surface mapped faults. Moreover, to define the geometry and depth extent of the active faults in the studied area, we have employed the Depth from Extreme Points method (DEXP) that produces an image of the source density distribution. Then we overlaid the DEXP image to the hypocenters section. The hypocenters section shows a sub-vertical plane, with the aftershocks tending to cluster between 12 and 16 km depth, well-correlated with sub-vertical DEXP maxima.
Our outcome of a E–W active fault with sub-vertical plain suggests a possible correlation of it with the pattern of the sub-vertical buried extension of Mattinata fault system, having E–W direction. These results are in good agreement with the geological and scientific works supporting the activation of Mattinata fault in 2002
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