1,721,077 research outputs found
A rolling stock-based system for catenary condition monitoring: Validation through numerical simulations on a rigid catenary
No full textCondition monitoring of rolling stock and infrastructure is becoming a key requirement for railway companies throughout the world, which are making a significant effort to equip commercial trains with diagnostic systems, to gather data daily instead of periodically as currently allowed by special-purpose diagnostic trains. This paper is part of a long-term work in which a diagnostic system, previously proposed by the authors, is being developed in cooperation with rolling-stock manufacturers, train operating companies and the Italian infrastructure manager. The system is able to monitor the pantograph and the overhead contact line through authomatic data acquisition and post processing in a wayside server, and should help shifting maintenance operations from time-based to condition based approaches. As a further application, the paper is focused on the detection of defects in a rigid overhead contact line. Numerical simulations of a healthy and a defective line are carried out to address the problem of signature definition for the identification of the defects
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
Migration and Land Use Change in Europe: A Review
Full text linkMigration and Land Use Change in Europe: A ReviewBell, S., Alves, S., Silverinha de Oliveira, E and Zuin, A.2010PRJLiving Reviews of Landscape Research 4(2010)2http://www.livingreviews.org/lrlr-2010-
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
The Role of Surgery in Pleural Mesothelioma: A Journey through the Evidence, MARS 2 and Beyond
Full text linkPleural mesothelioma (PM) is a rare incurable disease, predominantly linked to asbestos exposure. Not only is diagnosis difficult, but treatment choices are often limited to systemic anti-cancer treatment with chemotherapy or immunotherapy. Surgery has been employed for decades, but its application has been fiercely debated despite some randomized controlled trials such as the recent Mesothelioma and Radical Surgery 2 (MARS 2) study. We provide a commentary on this controversial topic
Dispositivo per prove di rendimento e fatica su viti a ricircolo di sfere
No full textIl dispositivo progettato permette di realizzare prove a fatica sulle trasmissioni meccaniche a viti a ricircolo di sfere e di valutare contestualmente il rendimento meccanico della trasmissione e lo stato di usura della stessa.
Tale dispositivo sfrutta il ricircolo di potenza, ottenuto precaricando, attraverso delle molle a tazza, due chiocciole montate su un unica vite. Tale accorgimento permette di ridurre la potenza meccanica che deve essere introdotta nel dispositivo per realizzare le prove a fatica e nello stesso tempo riduce i carichi che si scaricano sui supporti della vite.
Un opportuno sistema di misura acquisisce il valore della forza di precarico esercitata dalle molle a tazza, le forze scaricate a terra (reazioni vincolari) e la distanza fra le due chiocciole. Attraverso questi dati è possibile valutare il rendimento della trasmissione e il suo stato di usura
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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