1,720,956 research outputs found
Analisi e modellazione dei fenomeni franosi nel territorio comunale di Locana Valle Orco
No full textModelli e metodi per la simulazione numerica delle colate di fango e detrito in ambiente alpino: il caso di Pollein (Valle d'Aosta)
No full textModellazione Numerica di un Debris Flow Finalizzata alla Progettazione di Opere di Difesa in Ambiente Alpino
No full textApplicazione di modellistica bidimensionale per lo studio della dinamica di esondazione nei corsi d'acqua a pendenza elevata. Il caso del torrente Argentina ad Arma di Taggia (Imperia)
No full textUna metodologia di indagine completa per l'analisi delle piene torrentizie deve prevedere l'utilizzo di un modello numerico bidimensionale, poichè esso non si limita solo all'analisi della propagazione dell'onda di piena lungo le sezioni dell'alveo inciso, ma valuta anche gli effetti del deflusso nelle aree limitrofe evidenziando, contestualmente, le criticità presenti lungo tutto il percorso del corso d'acqua.
Il codice di calcolo utilizzato si basa sulle equazioni di conservazione del volume, affiancate da criteri di stabilità numerica che garantiscono, dopo una preliminare taratura dei parametri, la convergenza del calcolo. Una buona conoscenza topografica è alla base dell'allestimento del modello che, discretizzando l'area in studio in un reticolo di celle a maglia quadrata, consente l'inserimento di elementi di varia natura che possono interferire con il deflusso della corrente all'interno dell'alveo inciso e nelle aree esterne ad esso.
In questo ambito si è applicato un codice di calcolo bidimensionale, integrato da un modello monodimensionale, per lanalisi delle fasce fluviali nel tratto terminale del torrente Argentina, nel comune di Arma di Taggia (Imperia); la zona studiata è caratterizzata da elevate pendenze, generalmente problematiche da trattare con modellistica bidimensionale. L'analisi svolta permette di evidenziare limiti e vantaggi del modello numerico implementato e le sue possibili applicazioni in combinazione con altri codici di calcolo, utilizzati per la modellazione del deflusso nell'alveo inciso
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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