1,721,369 research outputs found
Optimization of the Demand Satisfied by a “Micro-Feeder” Hybrid-Electric Air Transport Service
No full textGoing 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
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
Biogas upgrading and liquefaction in an anaerobic digester plant
Get PDFThanks to the high energy density and to the extended range it can ensure, LNG is an attractive energy vector especially in heavy-duty transportation. This fuel is even more interesting if produced starting from biogas because of the reduced carbon footprint. Biogas production occurs in anaerobic digestion plants and various production strategies can be pursued to transform biogas into bio-LNG. In this study the anaerobic digester of the municipal wastewater treatment plant of Viareggio has been analyzed. The plant is equipped with a Capstone C600s co-generative micro gas turbine and with a boiler for the sludge heating. Three different bio-LNG production strategies have been considered. In the first strategy (the baseline case), the biogas fueled boiler provides the heat necessary for the sludge heating. The electric energy required for wastewater treatment and for upgrading and liquefaction processes is bought from the electric grid. In the second strategy, the micro gas turbine is operated in thermal following mode and the electric energy required by the plant processes is partly self-produced and partly acquired from the grid. In the third strategy, the micro-turbine is operated in electric following mode, attempting to cover all the electric load necessary to the process and part of the heat necessary to the sludge heating. The plant was analyzed in steady-state conditions by considering the heat requested by the anaerobic digesters, the efficiency curves of the micro gas turbine and the boiler, and the heat exchangers off-design behavior. Results showed that, according to the economic reference scenario, the solution with the high profitability can be that with the boiler of that with the micro gas turbine operated in thermal following mode
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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