1,721,014 research outputs found
Il problema delle deformazioni permanenti nelle pavimentazioni stradali a servizio dei sistemi di trasporto pubblico locale
No full textIl Civis rappresenta un importante progetto per la realizzazione di un sistema filoviario complesso come strumento di trasporto rapido di massa; ad esso sono collegate una serie di opere di
ammodernamento e riqualificazione delle infrastrutture viarie esistenti. Le sue peculiarità costruttive permettono a questo mezzo di essere collocato nella categoria dei filobus su gomma.Le dimensioni dei veicoli Civis sono simili a quelli dei tradizionali filosnodati a 2 casse. La massa complessiva del veicolo, considerando una capienza massima di 142 passeggeri è di circa 30000 Kg distribuiti su 3 assi, gli assi maggiormente sollecitati sono quello centrale e quello posteriore che trasmettono alla pavimentazione stradale un carico pari a 130 kN per asse, mentre l'asse anteriore scarica sulla pavimentazione 78 kN. La pressione di gonfiaggio dei pneumatici oscilla fra 0,90 MPa per le gomme dell'asse anteriore e 0,80 MPa per quelle dei restanti assi. I pneumatici non sono gemellati ma mono – ruota (2 per asse) e contengono al loro interno il motore elettrico. In fase progettuale, la pressione di contatto pneumatico - pavimentazione è stata assunta uguale a quella di gonfiaggio del pneumatico.
L’inserimento del nuovo sistema di trasporto pubblico locale Civis ha portato ad effettuare interventi di riqualificazione delle infrastrutture stradali esistenti. Il miglioramento eseguito sulle sovrastrutture stradali ha interessato sia i materiali impiegati che l'adeguamento degli spessori alle sollecitazioni prodotte dai carichi e alle caratteristiche dei sottofondi
Intermittent opening and flow of a mitral valve prosthesis caused by acute and chronic thrombosis
No full textAnthropogenic Modifications Can Significantly Influence the Local Mean Sea Level and Affect the Survival of Salt Marshes in Shallow Tidal Systems
No full textIn a shallow dissipative tidal system, interventions that modify the local morphology in one location of the basin may quickly affect the surrounding areas, promoting strong changes in their morphology. If the localized modification persists over time, it may produce far-field morphological modifications at delayed times. These modifications may have an impact on the local mean sea level and on tidal range, affecting the fate of salt marshes with implications for their survival. In this study, we investigate the effect of two anthropic interventions performed between the end of the nineteenth century and the beginning of the twentieth century in the northern Venice lagoon (Italy): the construction of jetties at one inlet and the removal of reed barriers protecting a fish farm in the inner lagoon. Using a 2-D numerical model to reproduce the hydrodynamics of different historical lagoon configurations and a zero dimensional model of marsh vertical accretion, we investigate the effect of these interventions on the salt marshes of the northern lagoon basin. Interestingly, our results show that the increased depth at the inlet induced by the jetties lowered the local mean sea level of nearby areas and increased the tidal range, producing a temporary positive feedback on the stability of the marshes in proximity of the inlet. On the contrary, in the inner lagoon areas characterized by extremely low marshes, the removal of reed barriers delimiting a fish farm may have reduced the sediment fluxes thus contributing to the drowning of large marsh surfaces
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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