1,720,966 research outputs found
The "Hourglass" model
No full textWhen there is an abnormality of the motorway traffic with drastic reduction of capacity, the almost immediate establishment of a queue is frequent. The note shows a generalized methodology to estimate the time needed to travel along a route in which a malfunction has occurred (even partial) forming a queue and with several possible time evolutions to free the section. The method is applicable to real situations in a motorway infrastructure with the primary purpose of providing correct information to users by means of variable message panels placed in a section upstream of the malfunction. The methodology was developed under a research agreement stipulated between the company Autostrade per l’Italia SpA and the Department of Civil and Environmental Engineering at the University of Florence.When there is an abnormality of the motorway traffic with drastic reduction of capacity, the almost immediate establishment of a queue is frequent. The note shows a generalized methodology to estimate the time needed to travel along a route in which a malfunction has occurred (even partial) forming a queue and with several possible time evolutions to free the section. The method is applicable to real situations in a motorway infrastructure with the primary purpose of providing correct information to users by means of variable message panels placed in a section upstream of the malfunction. The methodology was developed under a research agreement stipulated between the company Autostrade per l’Italia SpA and the Department of Civil and Environmental Engineering at the University of Florence
Risultati di un modello euristico per la valutazione della qualità dei sistemi di trasporto ferroviari = Results of a heuristic model to evaluate perceived quality of railway travels
No full textL'obiettivo di questa ricerca è l'identificazione delle relazioni e delle variabili decisive che legano il miglioramento del servizio e la domanda generata nel settore dei servizi ferroviari regionali. I risultati ottenuti evidenziano che le variabili efficaci non sono solo quelle concernenti la qualità intrinseca del servizio ferroviario (frequenze, tempi di percorrenza e qualità del materiale rotabile), storicamente utilizzate in letteratura e nella pratica operativa per la valutazione della ripartizione modale, ma che queste debbano tenere conto anche dell’attrattività delle aree d’interscambio in capo alla ferrovia per offerta di postazioni di ricarica per veicoli plug-in (ibridi e FEV), di servizi di sharing e servizi accessori per facilitare lo scambio modale. La ricerca ha conseguentemente sviluppato una metodologia specifica per ponderare l'importanza di queste variabili per lo studio della scelta modale con riferimento ai servizi di trasporto ferroviario regionale
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
Hypercubic Effects in semileptonic decays on the lattice
No full textWe present a lattice determination of the vector and scalar form factors of the semileptonic D -> pi l nu decays, which are relevant for the extraction of the CKM matrix element from experimental data. Our analysis is based on the gauge configurations produced by the European Twisted Mass Collaboration with N_f = 2 + 1 + 1 flavors of dynamical
quarks. We simulated at three different values of the lattice spacing and with pion masses as small as 210 MeV. Quark momenta are injected on the lattice using non-periodic boundary conditions. The matrix elements of both vector and
scalar currents are determined for a plenty of kinematical conditions in which parent and child mesons are either moving or at rest. Lorentz symmetry breaking due to hypercubic effects is clearly observed in the data and included in the
decomposition of the current matrix elements in terms of additional form factors. Our preliminary estimate for the vector form factor at zero 4-momentum transfer is f_+(D -> pi)(0) = 0.631(40), which can be compared with the latest FLAG average f_+(D -> pi)(0) = 0.666 (29) available only at N_f = 2 + 1
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
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