1,721,098 research outputs found
Design for the crossing over the river mersey (UK): Suspension bridge
No full textAs part of a larger research aimed at studying the aerodynamic and aeroelastic behaviour of single box decks for long-span suspension bridges in order to provide general guide lines of preliminary design, the new crossing over the River Mersey in the Liverpool area (UK) is presented as a casestudy. The research focuses on three generic cross-sections characterized by a different nose. Bridge deck preliminary design is performed according to Eurocode 1 and 3; static wind tunnel tests on the bridge deck are carried out in order to acquire pressure coefficients. Static force coefficients are obtained through the integration of the mean pressure distribution on the deck surface. Aeroelastic wind tunnel tests were performed in order to acquire flutter derivatives. FEM analyses are performed on the full scale model using forces time histories evaluated with aerodynamic coefficients obtained from pressure coefficients. Critical flutter velocity is calculated in order to study the global bridge instability. Results are presented
Acoustic detection of UHE neutrinos: a station for measurement of the deep sea acoustic noise.
Full text linkThe INFN NEMO (NEutrino Mediterranean Observatory) collaboration, aims at the construction of a km3
underwater Cherenkov neutrino telescope. In this framework NEMO is installing a Test Site facility at 2000 m depth, at
B25 km offshore the port of Catania (Sicily), that will be used to test a prototype module of the future km3 detector.
The collaboration is also studying the possibility to use the thermo-acoustic technique to detect UHE neutrino fluxes.
One of the major sources of uncertainty in the reliability of this technique is, presently, the lack of knowledge of the
acoustic noise at large depth. For this reason NEMO has developed a station for the measurement of acoustic
background, that will be installed at the Test Site. The station is equipped with four large bandwidth hydrophones
(1 Hz–50 kHz) whose data, digitized underwater, will be transmitted to shore through optical fibres. The station will
also be used, in collaboration with CIBRA, for research on marine mammals
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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