1,720,956 research outputs found
Finite element modeling tests of the seven moment tensor approximation of ground displacement from tri-axial pressurized ellipsoids.
No full textDynamic model of intrusion of magma and/or magmatic fluids in the large-scale deformation source of the Campi Flegrei caldera (Italy).
No full textContribution of 2009-2014 COSMO-SkyMed SAR data to the interpretation of the Campi Flegrei caldera, Italy, activity.
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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
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
Two High-Sensitivity Laser Strainmeters Installed in the Canfranc Underground Laboratory (Spain): Instrument Features from 100 to 0.001 mHz
No full textTwo laser strainmeters are being operated in the Canfranc Underground Laboratory (LSC, Central Pyrenees, Spain) at about 350 m depth. One of the two laser strainmeters (GAL16, striking 76o) is located about 670 m from the Spanish entrance of a decommissioned train tunnel, along the side wall of one of the bypasses connecting a recent highway tunnel to the train tunnel. The other strainmeter (LAB780, striking −32o) is located about 780 m from the Spanish entrance of the train tunnel, inside two narrow side halls parallel to and built at the same time as the train tunnel. Their mechanical and optical setups derive from a previous installation at Gran Sasso, Italy, with some changes and improvements. Here we show the main instrument features in the frequency range of 100–0.001 mHz. At frequencies lower than 4 mHz, strain noise compares well with the best laser strainmeters made till now, while at higher frequencies strain noise is higher than at Kamioka, Japan, probably because of frequency instabilities of the laser source. Environmental (air temperature and pressure) effects on measured strain are quite small; thus, signal-to-noise ratio in the tidal bands is unusually high. In particular, diurnal Ψ1and Φ1tides clearly emerge from noise even using a 2-year-long strain record, giving the opportunity to improve previous determinations of the Free Core Nutation parameters from strain data as soon as more data are acquired. The features of the LSC strainmeters allow investigating the Earth in a very broad frequency range, with a signal-to-noise ratio as good as or better than that of the best laser strainmeters in the world
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