1,721,038 research outputs found
Modellizzazione del deflusso veicolare tra due intersezioni semaforizzate ed analisi sperimentale per la valutazione delle emissioni inquinanti
No full textLa presente nota è frutto di una campagna di indagini sperimentali sui deflussi veicolari in ambito urbano iniziata nel 1994 presso il Dipartimento di Pianificazione Territoriale dell’Università della Calabria. Alcuni risultati preliminari riguardanti le elaborazioni di parte di essa sono stati presentati già nel 1995. La prosecuzione delle indagini, l’affinamento della metodologia e l’applicazione dei risultati ad uno studio delle emissioni inquinanti, uno dei filoni di ricerca, sono presentati in questa nota.
Alcuni lavori hanno messo in evidenza come le emissioni di inquinanti prodotte dai veicoli siano funzione delle fasi del moto (particolarmente nelle fasi di accelerazione) e del parco circolante.
Nella nota si illustra l’applicazione di un modello modale per lo studio delle emissioni inquinanti prodotte dal traffico veicolare in varie condizioni di moto e per un determinato parco circolante, quali sono stati rilevati in ambito urbano, in particolare in un tratto di arteria compreso tra due intersezioni semaforizzate, e le variazioni della produzione di inquinanti al variare delle condizioni di moto e del parco veicolare
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
A Spectrophotometric Apparatus with Laser Sources for Measurements of Fast Transient Signals
No full textAnalisi sperimentale dei profili ciclici di traffico
No full textNella nota viene presentata un’analisi sperimentale dei profili ciclici per alcuni parametri della circolazione dei veicoli rilevati su un segmento di arteria stradale urbana tra due intersezioni semaforizzate. Le misurazioni sono state effettuate su più sezioni: in prossimità dell’intersezione a monte, alla mezzeria del segmento ed in prossimità dell’intersezione a valle.
L’acquisizione dei dati, realizzata tramite apparecchiature televisive, ed il loro successivo studio hanno consentito di trarre utili elementi per la modellizzazione delle caratteristiche del deflusso e l’approfondimento dei meccanismi di dispersione dei plotoni di veicoli.
La metodologia di indagine utilizzata ha permesso anche il rilievo di velocità ed accelerazioni istantanee, parametri da poter utilizzare in modelli di emissione di inquinanti di tipo modale. Modelli di questo tipo trovano applicazione quando sia richiesto il calcolo delle emissioni e delle concentrazioni degli inquinanti in prossimità di punti singolari, quali, appunto, le intersezioni semaforizzate
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