130,417 research outputs found
Contour mapping of seismic areas by numerical filtering and geological implications
No full textA method is described that makes possible the identification of the independent seismic units of a given area (Caputo and Postpischl, 1973 b). The seismic information is treated as a bidimensional signal disturbed by a certain background noise. The filtering of this noise makes it possible to delineate the seismic areas objectively. An indirect check on the method was made by estimating with respect to the various regions identified the a and /J parameters of the law Ny = a e~Py which gives the number of earthquakes with magnitude (intensity) greater than or equal to y
Materials for the catalogue of Italian earthquakes: A reappraisal of minor seismicity
No full text1 CD-ROM allegatoNel catalogo CPTI04 [Gruppo di Lavoro
CPTI, 2004], un numero consistente di terremoti
è tutt’ora privo di uno studio di riferimento recente.
Nel corso di questo lavoro sono stati studiati
851 di questi terremoti: si tratta di eventi con Io
tra il V-VI e il VII grado MCS, verificatisi dal
1198 al 1980 ma soprattutto nel Novecento, i cui
parametri epicentrali derivano dal catalogo PFG
[Postpischl, 1985a]. Questi eventi sono stati sottoposti
a una sistematica revisione, adottando una
procedura speditiva omogenea e rigorosa che ha
permesso di elaborare nuovi parametri per 741 su
851 terremoti studiati.
Nei restanti 110 casi lo studio ha portato
a riconoscere 26 degli eventi studiati come inesistenti
o estremamente dubbi. In 84 casi, infine,
le informazioni storiche raccolte non sono risultate
sufficienti per l’elaborazione di nuovi parametri.
Il valore di intensità epicentrale è diminuito
nel 72% dei casi e aumentato solo nel
4.5% di essi; il 50 % circa dei terremoti rivisti
ha un’intensità epicentrale inferiore alla soglia
attualmente adottata dal catalogo. Si notano
anche significative variazioni nella localizzazione
di alcuni dei terremoti rivisti.
I risultati del lavoro sono riassunti in 851
schede di sintesi e circa 12.500 punti d’intensità
osservati, che sono presentati in questo
Quaderno insieme a una sintetica introduzione
metodologica.Published1-755.1. TTC - Banche dati e metodi macrosismiciN/A or not JCRope
Indagine di microzonazione sismica, intervento urgente in 39 centri abitati della Campagna e Basilicata colpiti dal terremoto del 23 novembre 1980.
No full textMeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Materiali per un catalogo dei terremoti italiani: eventi sconosciuti, rivalutati o riscoperti
No full textThe large-scale studies of historical seismology carried out in Italy and Europe in the last decades were mostly aimed at
improving knowledge about earthquakes that were already listed in the extant parametric catalogues, rather than at
identifying earthquakes that were not listed in them.
From 1992 onwards, some of the authors of this study started to look for such “forgotten” earthquakes in different ways (by
systematic surveys of serial historical sources, or by extensive investigation of local records in selected areas). More than 2000
pieces of evidence related to as many earthquakes not listed by any seismological compilations/catalogues were thus identified.
In 2003 all resources were pooled in a common effort, meant to complete the revision of minor “known” earthquakes carried
out by Molin et al. [2008] with a study of the most relevant “unknown” earthquakes identified so far. We present here the
results of the analysis of 227 damaging earthquakes, 155 of which are “unknown” to the seismological tradition. Other 72
events were listed in the Postpischl [1985] catalogue, but not in newer parametric catalogues, no evidence of damage being
available for them at the time: such evidence has now been found and, in 21 cases at least, it allows for a significant re-evaluation
of macroseismic intensity.Published1-535.1. TTC - Banche dati e metodi macrosismiciN/A or not JCRope
Materiali per un catalogo dei terremoti italiani: eventi sconosciuti, rivalutati o riscoperti
No full textThe large-scale studies of historical seismology carried out in Italy and Europe in the last decades were mostly aimed at
improving knowledge about earthquakes that were already listed in the extant parametric catalogues, rather than at
identifying earthquakes that were not listed in them.
From 1992 onwards, some of the authors of this study started to look for such “forgotten” earthquakes in different ways (by
systematic surveys of serial historical sources, or by extensive investigation of local records in selected areas). More than 2000
pieces of evidence related to as many earthquakes not listed by any seismological compilations/catalogues were thus identified.
In 2003 all resources were pooled in a common effort, meant to complete the revision of minor “known” earthquakes carried
out by Molin et al. [2008] with a study of the most relevant “unknown” earthquakes identified so far. We present here the
results of the analysis of 227 damaging earthquakes, 155 of which are “unknown” to the seismological tradition. Other 72
events were listed in the Postpischl [1985] catalogue, but not in newer parametric catalogues, no evidence of damage being
available for them at the time: such evidence has now been found and, in 21 cases at least, it allows for a significant re-evaluation
of macroseismic intensity.Published1-535.1. TTC - Banche dati e metodi macrosismiciN/A or not JCRope
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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