1,720,984 research outputs found
Set up of a CCSEM mapping technique for assessment of fluidized bed desulphurization
No full textIn this work the influence of the sorbent size range and of the reaction temperature on the particles sulphur distribution pattern and calcium conversion degree is investigated. A characterization of the main sulphur distribution patterns is carried out with the aid of a novel Computer Controlled Scanning Electron Microscope (CCSEM) quantitative technique based on an automated statistical analysis of the elemental sulphur mappings of cross sections of spent sorbent particles
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
The influence of the hydration time on spent sorbents reactivation for fluidized-bed desulphurization processes
No full textIn this work spent limestone-based sorbents, generated in fluidized-bed desulphurization tests under simulated combustion conditions, were reactivated by means of a hydration process at 25°C (for times ranging from 1 to 24 h) and further reinjected in the fluidized-bed reactor. The final calcium conversion degrees of resulphated sorbent particles were related to the redistribution of sulphur inside the spent sorbent particle structure and to a “molecular cramming” phenomenon, both dependent on the hydration reaction time
THE INFLUENCE OF THE HYDRATION TIME ON SPENT SORBENTS REACTIVATION FOR FLUIDIZED -BED DESULPHURIZATION PROCESSES. PROCEEDINGS OF COMBUSTION AND SUSTAINABLE DEVELOPMENT
No full textReactivation of FBC spent sorbents by water and steam hydration
No full textThe aim of this experimental work was to characterize the influence of the water- and steam- hydration/reactivation processes of FB spent sorbent particles on sulphur capture ability and particles sulphation patterns, fragmentation and attrition phenomena upon resulphation in FB reactors
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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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