1,720,968 research outputs found
Environmental Wind Tunnel Study on a Municipal Waste Incinerator
No full textIn this paper results concerning a diffusion experiment on a small scale model of a waste incinerator, carried out in a boundary layer wind tunnel, will be presented. At the beginning a description of the measurement system that has recently been placed in the wind tunnel will be given together with a study of repeatability of the measurements results. A comprehensive study of the flow mean characteristics at different position in the tunnel working section will be reported and at the end some vertical and horizontal concentration profiles results will be described and discussed
Aerodynamic behaviour of hyperbolic paraboloid shaped roofs: Wind tunnel tests, proper orthogonal decomposition and computational fluid dynamics analysis
No full textThe need to cover large areas while maintaining unobstructed interior spaces is a permanent challenge in the design of medium and large span roofs. In line with international trends, a technology already used in the past for this type of application, i.e. tensile structures made with nets of tension cables, is proposed anew. These structures meet the requirements of today's market in terms of lightness, innovation of materials, cost-effectiveness and lack of intermediate supports. However, tension structures are used rarely in Italy, also due to the lack of clear regulations on the structural design and the determination of environmental stresses on complex shapes such as hyperbolic paraboloids. This research follows two consecutive steps: the first is aimed at developing an optimized procedure of preliminary designs for the cable structure; the second is focused on the study of wind action on these structures. The shape selected for a parameterization leading to an optimized design of this kind of structures is the hyperbolic paraboloid. © Civil-Comp Press, 2009
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
Innovative deck configurations for very long-span suspension bridges to prevent classical flutter instability
No full textRiattivazione naturale dell’infezione da Caprine herpesvirus 1 in capre con infezione latente
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