1,721,082 research outputs found
La misura del flusso di CO2 dal suolo di un’area vulcanica tramite Stazioni per l’Acquisizione di Parametri Geochimici (SAPG): un contributo al monitoraggio geochimico in continuo della Solfatara di Pozzuoli e del Vesuvio (Napoli, Italia)
No full textIl monitoraggio in continuo di parametri geochimici in aree di vulcanismo attivo è di primaria
importanza per due ragioni principali: 1) prevedere l’evoluzione temporale dei sistemi vulcanici, in
particolare l’inizio dell’attività eruttiva; 2) migliorare le conoscenze sui processi profondi che
governano il degassamento.
Ai fini della previsione di un evento eruttivo, il controllo in continuo del degassamento dal suolo si
è mostrato notevolmente utile in diverse zone vulcaniche attive; anomalie nel degassamento della
CO2 o di gas in tracce, per i quali la CO2 agisce come carrier (i.e. Rn and He), sono stati osservati
prima e/o durante episodi di “unrest” in diversi vulcani (i.e. Etna, Stromboli, Vulcano, Campi
Flegrei, Allard et al.,1991; Badalamenti et al., 1988, 1991a, 1991b; Baubron et al.,1990; Carapezza
et al.,1990; Chiodini 1996; Lombardi et al.,1984; Lombardi and Nappi, 1986).
E’ stato inoltre accertato che la quantità di CO2 rilasciata come emanazione diffusa da un suolo
vulcanico è più elevata di quella emessa dalle manifestazioni fumaroliche. In alcuni casi questa
quantità è confrontabile con i gas emessi da plumes di vulcani in eruzione (Allard et al.,1991;
Baubron,1990; Baubron et al.,1991; Chiodini, 1996; Chiodini et al., 2000).
Il principale scopo del monitoraggio, indipendentemente da fini scientifici o di sorveglianza, è di
misurare ed interpretare il segnale che arriva dal profondo. Sfortunatamente, la maggior parte delle
misure registrate può essere influenzata da fattori esterni. E’ stato empiricamente osservato, infatti,
che la concentrazione di gas nel suolo, è legata ai fattori ambientali quali pioggia, pressione
barometrica, temperatura e umidità del suolo e dell’aria, intensità e direzione del vento (Alm et
al.,1999; Hinkle 1986,1994; Reimer 1980). Un recente lavoro di J.D. Rogie et al., ha messo in
evidenza che anche il flusso di CO2 dal suolo dipende dai fattori atmosferici, in particolare, per
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l’area di Mammoth Mountain, dalla pressione atmosferica e dall’intensità del vento (Rogie J.D. et
al., 2001).
Di conseguenza, per poter usare proficuamente l’informazione contenuta nei dati registrati, è
necessario trovare la relazione tra i fattori esterni ed il flusso, quantificare e quindi rimuovere il
“disturbo”.
Oggetto del presente rapporto è l’esposizione dei risultati registrati negli ultimi due anni dalle
Stazioni per l’Acquisizione di Parametri Geochimici (SAPG) che sono installate ai Campi Flegrei
ed al Vesuvio.
Le SAPG misurano il flusso di CO2 (jCO2 ) dal suolo e, contemporaneamente, alcuni parametri
ambientali che possono avere influenza sul processo di degassamento.
Sarà quindi esposta la trattazione matematico-statistica dei dati che ha lo scopo di quantificare ed
eliminare l’aliquota di segnale imputabile a tali fattori esterni.Istituto Nazionale di Geofisica e VulcanologiaPublished1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveope
Carbon dioxide degassing and energy thermal energy release at vesuvio (Italy). EGS-AGU-EUG Joint Assembly
No full textApplication of sthochastic simulation to carbon dioxide flux from soil: Mapping and quantification of gas release (2003). EGS-AGU-EUG Joint Assembly
No full text
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
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