1,721,074 research outputs found
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
Platinum-free Carbon Nitride Electrocatalysts for PEMFCs Based on Pd, Co and Ni: Effect of Nitrogen on the Structure and Electrochemical Performance
No full textThis report describes two new synthesis protocols for the preparation of “core-shell” platinum-free electrocatalysts consisting of graphite cores covered by carbon nitride shells embedding the active sites. The resulting systems are characterized by a well-controlled chemical composition with different wt% of nitrogen in their supports. The protocols rely on the thermal decomposition of precursors obtained by networking suitable metal coordination complexes with an organic binder over active carbon nanoparticles. The resulting electrocatalysts showed a higher thermal stability in oxidizing conditions with respect to a reference system. The materials provided a remarkable performance in the oxygen reduction reaction (ORR), even if a lower selectivity towards the desired 4-electron pathway is observed. Membrane electrode assemblies (MEAs) tested in operative conditions with the proposed materials applied at the cathode required a lower mass of noble metal (up to 0.46 g/kW) to achieve the same electrical power as the platinum-based reference (1.1 g/kW)
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
New hybrid inorganic-organic proton conducting membranes based on Nafion and a [(ZrO2)•(Ta2O5)0.119] oxide core-shell nanofiller
No full textThe current state-of-the-art proton-conducting membranes for application in fuel cells and electrolysers are perfluorinated ionomers such as Nafion® and Aquivion®. These materials feature excellent chemical and electrochemical stability and very high proton conductivity in fully-hydrated conditions. However, perfluorinated ionomers do not yield good performances in a dry state and at temperatures higher than 80-90°C. To overcome these deficiencies, a new family of hybrid inorganic-organic membranes based on Nafion and a “core-shell” nanofiller consisting of ZrO2 nanoparticles acting as the “core” covered by a thin layer of Ta2O5 as the “shell” is proposed. Six hybrid membranes with a nanofiller content of 3, 5, 9, 11, 13 or 15 wt% are prepared by a standard solvent-casting procedure. These systems are extensively characterized by thermoanalytical techniques (water uptake determination, HR-TGA, MDSC, DMA), vibrational spectroscopy (FT-IR ATR), SEM, HR-TEM, and broadband electric spectroscopy (BES). In general, the addition of nanofiller reduces the water uptake and improves the mechanical properties of the hybrid membranes as compared to pristine Nafion. Promising conductivities are obtained for the hybrid membranes at T=115°C (7.5x10-2 Scm-1 at 9wt% nanofiller vs. 3.3x10-2 Scm-1 for Nafion). The interplay between the structure and the proton conduction mechanism is investigated and reveals the presence of two electric polarizations associated with structural inhomogeneities of the materials. Finally, the best performing hybrid membrane (9 wt% nanofiller) is used to manufacture a membrane-electrode assembly (MEA) which is tested in single fuel cell configuration. The results demonstrate an improved fuel cell performance at low hydration levels in comparison with pristine recast Nafion
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
