1,721,063 research outputs found
Task 3 - Molise. Deliverables D9-D10-D11. Risposta sismica locale a S.Giuliano di Puglia e in alcuni comuni limitrofi
No full textGIS scenari di scuotimento area Molise (DVD)Progetto S3 - Scenari di scuotimento in aree di interesse prioritario e/o strategicoPublished4.2. TTC - Scenari e mappe di pericolosità sismicaope
An Experimental Approach for Estimating Seismic Amplification Effects at the Top of a Ridge, and the Implication for Ground-Motion Predictions: The Case of Narni, Central Italy
No full textFrom March to September 2009, a velocimetric network was installed in Narni, central Italy, a village on the top of a limestone ridge. The aim was to investigate local site effects due to the 220-m-high ridge, which is characterized by slopes ranging from 22 degrees to 35 degrees. To investigate amplification without and with a reference site, three stations were installed at the base of the hill and seven at the crest. The network recorded 702 earthquakes, many of them from the 2009 L'Aquila sequence. To determine the dependence of amplification on the morphological features, the spectra were computed for horizontal components rotated into a range of azimuths. Both the ratio of the horizontal-to-vertical-component spectra and the ratio of the spectra at the ridge crest with respect to a reference station at the base of the ridge showed amplification by a factor of circa 4.5 for frequencies between 4 Hz and 5 Hz. The highest amplifications were seen for the directions of the ground motion perpendicular to the main elongation of the ridge. Finally, considering events with an epicentral distance less than 30 km, empirical ground-motion models were calibrated for maximum horizontal peak ground acceleration (PGA), velocity, and acceleration response spectra (5% damping) up to 1 s, to estimate the site-corrective coefficients for topographic amplification. The data show corrective coefficients between 0.35 and 0.48 (log 10 scale; amplification, 2.2-3.0) for the spectral ordinates between 0.2 s and 0.3 s
Lo scavo con TBM della rimonta del Progetto Premadio II in Alta Valtellina (Prov. di Sondrio): confronto tra le previsioni progettuali, i dati macchina e le condizioni geomeccaniche degli ammassi rocciosi scavati
No full textThe note reports the results of a geomechanical survey carried out along the tunnel, at a 45° slant and 827 meters in length dug to house a new pressure water pipe as part of the Azienda energetica milanese (Aem S.p.A.) Premadio II project in the Upper Valtellina (Province of Sondrio). The project includes a number of works with the aim of substantially strengthening the existing hydroelectric power station at Premadio. The excavation was done by the Quadrio Curzio S.p.A. Company of Milan using an unshielded full section cutter.
The results of the geomechanical analysis were compared both with the analysis of the forecasts drawn up at the planning stage, and with the performance parameters of the cutter recorded during the excavation. The comparative examination of a series of parameters provided indications regarding how thorough the geognostic investigations were and what technical decisions werw taken with respect to carring out the excavation
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
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