1,721,022 research outputs found
La geochimica del granato nelle granatiti della Val Fiorina (Val Grande, Ivrea-Verbano).
No full textIn this note we consider the relationship between gabbroic sills and metasediment in a peculiar area of the Ivrea Zone, Val Fiorina, where the dominant rock type is garnetite (modal garnet > 60%). Garnetite layers, which reach a tnickness up to 15 m, invariably separate melasediment and gabbroic silIs. Garnets of these layers are almandine-rich pyralspites. The main variation of the garnet composition which occur trough tne sections is a grossular concentration increase and a decrease of the pyrope-almandine component, away from the metasediments. Garnets are LREE depleted and in general have flat or slightly increasing MREE-HREE patterns. The most striking feature of the REE profiles is the negative Eu anomaly, which decreases away from the metasediment contact. A garnetite petrogenesis related with interaction of basaltic and anatectic melts is here favoured wilh respect to processes of subsolidus element diffusion and a formation of refractory residua after advanced anatexis of metasediments
Caratteri geochimici ed isotopici delle rocce basiche della Zona Ivrea-Verbano Nord-Orientale: Il Gabbro di Finero e le Anfiboliti.
No full textVengono messe in evidenza le differenze geochimiche tra l'Unità del Gabbro Esterno del complesso intrusivo di Finero (Alpi Meridionali) e le anfiboliti con affinità di tipo N-MORB dcll’Unità Kinzigitica. In particolare le anfiboliti mostrano arricchimenti in LREE (La, Ce, Nd) e LILE rispetto al Gabbro Esterno. I rapporti Ba/Nb risultano profondamente diversi tra il Gabbro Esterno (valori 1). I dati radiometrici a disposizione sono contrastanti, indicando due possibili scenari alternativi per l'evoluzione del complesso basico di Finero. II primo prevede che il complesso di Finero sia circa coevo o posteriore a quello della Val Sesia (- 270Ma). mentre il secondo prevede che il complesso si sia intruso circa 530 Ma fa in crosta oceanica, contemporaneamente ai protoliti delle anfiboliti della Unità Kinzigitica e che il complesso basico e l'Unità Kinzigitica costituiscano parti di un unico prisma di accrezione. In questa breve nota vengono evidenziati dati a sostegno dell'ipotesi che il complesso si sia intruso posteriormente all'evento termico che ha prodotto la facies granulitica nell' Unità Kinzigitica, e che quindi sia circa coevo con quello della Val Sesia
Drug Safety and Relevant Issues in the Real-World
No full text: The global impact of the COVID-19 pandemic has underscored the pivotal role of drug safety and effective communication within the realm of pharmacovigilance, particularly in times of unprecedented public health emergencies [...]
Processi di anatessi in crosta profonda: Un esempio nella Zona Ivrea-Verbano (Val d'Ossola, Italia Nord-Occidentale).
No full textThe Ivrea-Verbano zone, Southern Alps, is a section of lower crust intruded by basic magmas, both later reequilibrated at high P-T conditions. In the Val Fiorina, north of the middle Val d'Ossola, these concordant intrusions are constituted by sills of differentiated basic rock (gabbro, amphibolic pyroxenite and peridotite) that are bounded by very restitic crustal rocks (garnetites) from former felsic granulites. The whole rock major element trends, mineral associations, phase crystalchemistry and patterns of minor and trace elements from these crustal rocks are consistent with anatectic processes. These processes were supposedly generated by the intrusion of basic sills, produced in the surrounding metasediments a restitic portion (garnetites) and a granitic melt, the latter presently recorded in the area by some leucocratic dykes
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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