1,720,964 research outputs found
PORTI E CITTÀ: DA PERIFERIA A PORTA DI ACCESSO ALLA METROPOLI. IL CASO DI FIUMICINO
No full textResosi indipendente dalla città di Roma nel 1992, il Comune di Fiumicino oggi gioca un duplice ruolo nel quadro del panorama urbanistico laziale. Da una parte comune autonomo, dall’altra satellite di un’area metropolitana. La recente indipendenza amministrativa da Roma si rilegge ancora nello stato delle cose: Fiumicino seppur dotata di una identità caratteristica non riesce ad affrancarsi dallo status di “ex-periferia” romana. Fin dall’antichità Fiumicino ha rappresentato per la Capitale la principale porta d’accesso via mare (si pensi al Porto di Traiano del II sec d.C.), dagli anni 50 del novecento poi, è sede del principale aeroporto di Roma, il terminal “Leonardo da Vinci”, che rappresenta una vera e propria porta d’accesso via aria alla capitale. Nel contesto attuale, in relazione ai processi di crescita della Capitale, che tende ad inglobare i centri limitrofi costituendo con essi un unico sistema territoriale policentrico, non si può non considerare Fiumicino come un’appendice di Roma. Il progettodel nuovo porto dona a Fiumicino un forte potenziale di sviluppo economico, ed un’occasione per partecipare attivamente alla crescita del territorio. Il porto, nell’accezione contemporanea, non è più un locus conclusus, ma è un nodo complesso, diviene “il portale di accesso” allacittà, attraverso esso si intrecceranno flussi di persone e merci, scambi e commerci. Il porto di Fiumicino sarà quindi un vero e proprio gateway di flussi di risorse ed energia economica e rappresenta un trampolino di lancio per un processo di sviluppo e riqualificazione urbana. Il presente lavoro si inquadra nella Ricerca MIUR Ateneo 2009-2010 “Città e network portuali: nuove frontiere per lo sviluppo territoriale”
L`utilizzo delle tecnologie GIS nelle Valutazioni di Compatibilità e Impatto Ambientale delle Grandi Infrastrutture
No full text
Dissolution of irregularly-shaped drug particles: mathematical modelling
Full text linkThe prediction of drug dissolution profiles is crucial for elucidating the pharmacokinetic behaviour of drugs and the bioavailability of dosage forms. In this work, we develop a mathematical model to describe the dissolution process of irregularly shaped particles. We use a complete dissolution model that accounts for both surface kinetics and convective diffusion. The mechanistic relationship between the mass transfer coefficient and the local curvature is derived from the fundamental physical laws governing these processes. Our model theoretically shows that the dissolution rate depends nonlinearly on the surface curvature. The subsequent recrystallization process in the bulk fluid is also considered. The main result of this work is its simplicity, since only two coupled nonlinear ordinary differential equations are needed to describe the dissolution process. Another remarkable advantage is the possibility to determine the model parameters using common independent techniques, so that the importance of the wettability of solids on the dissolution process can be evaluated. Finally, the proposed model demonstrated the importance of particle shape in describing the experimental dissolution data of theophylline monohydrate
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
Tecnologie GIS-SIT per la valutazione di compatibilità e di impatto ambientale delle grandi infrastrutture: una applicazione alla Gronda Merci di Roma- Cintura Sud
No full textVariations 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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