1,721,058 research outputs found
The Italian strong motion database: ITACA 1.0
No full textDipartimento della Protezione CivilePublished5.2. TTC - Banche dati di sismologia strumentaleope
SYNTHETIC SEISMOGRAMS FOR SEISMIC HAZARD ASSESSMENT: CASE-STUDIES IN ITALY
No full textThe ground shaking prediction for future earthquakes is the key issue of any assessment of seismic hazard. The most straightforward way to produce ground shaking scenarios makes use of Ground Motion Prediction Equations (GMPEs). The employment of the GMPEs, however, becomes questionable in near-fault conditions. Indeed, empirical models, even though calibrated on past records of acceleration waveforms, generally provide a simplified representation of the ground motion predicted around the source. This is essentially due to the paucity of data for moderate-to-large events at short source-to-site distances. When a more detailed and realistic representation of the seismic shaking is required, numerical simulations can be a reliable alternative. Several simulation techniques have been proposed to this aim with different levels of complexity depending on the approximations introduced to represent seismic source, wave propagation and site response. The result is that the modeling of the same event with different techniques may produce ground motions differing in terms of amplitude, duration and frequency content. For this reason, before using numerical simulations to predict ground motion of future earthquakes, the adopted methods should be carefully validated through quantitative procedures based on the comparison between observed and simulated waveforms. One of the goal of the S3 project (INGV-DPC Agreement 2005- 2007), coordinated by Francesca Pacor and Marco Mucciarelli, was the generation of shaking scenarios at bedrock and including site responses. Starting from these pioneer studies, several issues related to the use of synthetics seismograms for hazard assessment have been addressed. In this work, we present an overview of the modeling studies of the major Italian earthquakes (1980, M 6.9 Irpinia event; 1990, M 5.8 Sicily earthquake; 1997, M 6.0 Umbria Marche main-shock; 2009, M 6.3 L’Aquila events), carried out applying different simulation techniques (stochastic, deterministic- stochastic, broad-band). We also discuss some examples of scenario-events, generated at single and multiple sites, illustrating our approaches to handle the synthetic ground-motion variability. Finally, we show an hazard evaluation based on hybrid ground motion prediction equations, calibrated using synthetics waveforms at short distances and recorded waveforms, far from the source
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
A geostatistical modelling of empirical amplification functions and related site proxies for shaking scenarios in central Italy
No full textThis work aims at identifying and modelling statistical dependencies between empirical amplification functions of sites in central Italy and the main geological and
geophysical characteristics of the region, within a geostatistical analysis framework. The empirical functions, named δS2S, are estimated by decomposing the re
siduals of the median predictions of a non-ergodic ground motion model of elastic acceleration response spectra developed for the reference region. To select the
model that best describes the spatial variability of the data, the performance of stationary and non-stationary spatial models is compared, the latter being able to
constrain the prediction of the empirical functions to physical quantities available in the region and descriptive of the geology, topography and geographical location
of the site. Finally, we obtain optimal models of δS2S, for each spectral ordinate, parameterised as a function of geographical coordinates and an input map of shear
wave velocity in the upper 30 m (Vs30) constructed ad hoc by combining information gathered from two high-resolution maps available for the region. The
methodology allows the development of a new practice-oriented framework for the empirical estimation of site amplification, which can be adopted for the gen
eration of shaking scenarios in the context of regional hazard and seismic risk assessment.Published108496OST2 Deformazione e Hazard sismico e da maremotoJCR Journa
- …
