1,721,056 research outputs found
Tecnologie solari a concentrazione: potenzialita’ energetiche, ambientali ed economiche di impianti a concentratori parabolici lineari
No full textPlutarco, Tito Livio e Polibio raccontano che Archimede, nel 212 a.C., durante l’assedio di Siracusa incendiò le quinqueremi di legno della flotta romana di Marcello servendosi di “specchi ustori” che concentravano i raggi solari. Sebbene le proprietà della radiazione solare concentrata siano conosciute dall’uomo fin da tempi antichi, le tecnologie basate sulla concentrazione sono oggi ritenute le meno interessanti tra le tecnologie solari. Gli stessi studi scientifici più recenti, esaminano in dettaglio gli aspetti tecnologici connessi ai nuovi dispositivi anidolici ma raramente si soffermano ad analizzare le potenzialità degli stessi concentratori in termini di riduzione dei consumi di energia primaria fossile e di emissioni inquinanti. Questi parametri di valutazione sono stati così adottati in questo articolo, per valutare le potenzialità di interventi di energy retrofit, attuati con installazione di un campo di concentratori parabolici lineari, in riferimento ad un caso studio rappresentato da un’utenza oggi connessa alle tradizionali reti energetiche. I risultati hanno confermato i notevoli benefici che deriverebbero dalla scelta di una configurazione impiantistica ibrida in cui le preesistenti connessioni fossero preservate, consentendo nel contempo di individuare una prima linea guida per un dimensionamento ottimale dell’impianto solare. Questo ultimo aspetto è di particolare importanza soprattutto in considerazione degli elevatissimi costi della tecnologia
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
Applicazioni delle microonde per il trattamento non invasivo di beni artistici, archivistici ed architettonici
No full textDispelling 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
Aziz N.A., Monzini P., Pastore F., The Changing Dynamics of Cross-border Human Smuggling and Trafficking in the Mediterranean, 2015
No full textAziz N.A., Monzini P., Pastore F., The Changing Dynamics of Cross-border Human Smuggling and Trafficking in the Mediterranean, NewMed Research Network, Istituto Affari Internazionali, Rome, 2015 "Moving from the understanding of the two phenomena of human smuggling and trafficking, which are close to one another but conceptually different, the report discusses the extent to which old and new realities in the Mediterranean region have an impact on regional and crossregional migration flows, ..
Aziz N.A., Monzini P., Pastore F., The Changing Dynamics of Cross-border Human Smuggling and Trafficking in the Mediterranean, 2015
No full textAziz N.A., Monzini P., Pastore F., The Changing Dynamics of Cross-border Human Smuggling and Trafficking in the Mediterranean, NewMed Research Network, Istituto Affari Internazionali, Rome, 2015 "Moving from the understanding of the two phenomena of human smuggling and trafficking, which are close to one another but conceptually different, the report discusses the extent to which old and new realities in the Mediterranean region have an impact on regional and crossregional migration flows, ..
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