1,720,975 research outputs found
Ability of software SWMM to simulate sewer smooth pressurization transient
No full textAs a consequence of heavy rainfall events or network malfunctioning, filling of sewers (pressurization) and network overflowing may occur. Several models are commonly used to simulate floods in drainage networks and their results are usually thought to be reliable and robust. Actually, mathematical models based on the momentum equation appear to be more suitable in correctly simulating the pressurization moving jump but models based on the energy equation are much more popular because of their greater simplicity in comparison to the former ones. In this paper, on the basis of laboratory pipe tests, the ability of software SWMM (Storm Water Management Model, probably the most popular software for drainage networks) to simulate transient pressurization is studied. Many numerical tests were carried out by SWMM varying the spatial and time steps as well as the Preissmann slot width in order to examine the performances of the software along even wider intervals of these parameters than usual in practical applications. The comparison between simulated and experimental surges allows one to draw interesting conclusions on the effectiveness of SWMM in simulating pressurization as well as on the choice of the parameters themselves
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
Suspense! Il cinema della possibilità
No full textChe cos’è la suspense? Come funziona? A che cosa serve?
Si potrebbe sostenere della suspense quello che Agostino diceva a proposito del tempo: “Se nessuno me lo chiede, lo so; se voglio spiegarlo a chi me lo chiede, non lo so più”. Tutti sappiamo a cosa ci si riferisce quando si parla di un film o di un libro di suspense ma, non appena proviamo a spingerci un po’ più in là del suo mero funzionamento tecnico-narrativo (un dispositivo drammaturgico che tiene lo spettatore con il fiato sospeso in attesa che qualcosa di imprevisto si riveli), ci accorgiamo che essa è particolarmente refrattaria all’ingabbiamento concettuale, un meccanismo sfuggente e opaco, privo di chiari appigli teorici. L’idea di Cantone e Tomaselli è che la suspense trovi nel medium audiovisivo (nel cinema, ma anche nella serialità televisiva e nel videogame) il suo terreno più fertile proprio perché l’immagine in movimento la declina in una sua specifica forma storico-ermeneutica, relativa ai diversi ambiti mediatico-culturali nei quali essa si esercita: la suspense si sostanzia più a partire dalla peculiare dimensione esistenziale e storica del soggetto-spettatore che attraverso le tecniche narrative utilizzate
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
Ability of Preissmann slot scheme to simulate smooth pressurisation transient in sewers
No full textUrban drainage networks are generally designed to operate in a free-surface flow condition. However, as a consequence of heavy rainfall events or network malfunctioning, filling of sewers (pressurization) and network overflowing may occur. Several softwares are commonly used to simulate floods in drainage networks and their results are usually thought to be reliable and robust. However, no specific studies have been carried out on the behaviour of these softwares during the pressurization transient. Actually, mathematical models based on the momentum equation appear to be more suitable in correctly simulating the pressurization moving jump but models based on the energy equation are much more popular because of their greater simplicity with respect to the formers. Such models make use of Preissmann slot simplification to handle pressurization. In this paper, on the basis of laboratory pipe tests, the reliability of such simplification is studied by means of a popular model: SWMM (Storm Water Management Model). Many numerical tests were carried out by SWMM varying the spatial and time steps as well as the Preissmann slot width in order for the performances of the software to be examined along even wider intervals of these parameters than is usual in practical applications. The comparison between simulated and experimental surges allows one to draw interesting conclusions on the effectiveness of SWMM in simulating pressurization as well as on the choice of the parameters themselves
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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