1,721,021 research outputs found
ALFRED: A revised concept to improve pool related thermal-hydraulics
No full textALFRED, namely the Advanced Lead-cooled Fast Reactor European Demonstrator, has been conceived to serve the industrial deployment of the Lead-cooled Fast Reactor (LFR) technology. ALFRED is a demonstrator reactor designed with the specific purpose to test and qualify innovative components and procedures to be used in commercial reactors. In its role of European Technology Demonstrator Reactor, it will offer a representative operational environment of interest for research organizations, industry and safety authorities. Initially developed as part of a collaborative effort funded through the European 7th Framework Programme, the project was taken over by an international consortium Fostering ALFRED Construction (abbreviated to FALCON). As one of the priorities of the consortium Expert Board, the ALFRED design underwent an in depth review, aimed at identifying and addressing vulnerabilities in terms of reliability and safety, investigating also scalability of the design, flexibility for maintenance and replacement, manufacturability of components, availability of codes and standards for nuclear components and materials. The reactor coolant system arrangement was found susceptible to two main thermal-hydraulic issues typical of Fast Reactor (FR) pool-type designs: (i) thermal stratification in the upper part of the pool and (ii) potential steam entrainment in case of Steam Generator Tube Rupture or leakage. Moreover, (iii) the risk of lead freezing, more specific to the use of high melting point metals as coolants, represented a third issue, of particular concern in conjunction with the passive residual heat removal function in accident conditions.Starting with a general description of the ALFRED Project framework, including the experimental facilities in support to the LFR Research, Development and Qualification plan, the paper will focus on the new system arrangement and Decay Heat Removal (DHR) system of the ALFRED concept design, aimed at improving the pool thermal-hydraulics against the above described issues and risks. Since the ALFRED revised configuration is considered to offer improved safety and robustness, the FALCON consortium is willing to share the outcome of private and national investments, with hope of stimulating new opportunities for further developments and investigations through advanced computational tools and experimental tests within the LFR research community
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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