1,720,994 research outputs found
Does the increase in Y-dopant concentration improve the proton conductivity of BaZr1-xYxO3-δ fuel cell electrolytes?
No full textExploring highly yttrium doped barium zirconate proton conductor electrolytes for application in intermediate temperature solid oxide fuel cells (IT-SOFCs)
No full text
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
Towards the next generation of solid oxide fuel cells operating below 600 °c with chemically stable proton-conducting electrolytes
No full textThe need for reducing the solid oxide fuel cell (SOFC) operating temperature below 600 °C is imposed by cost reduction, which is essential for widespread SOFC use, but might also disclose new applications. To this aim, high-temperature proton-conducting (HTPC) oxides have gained widespread interest as electrolyte materials alternative to oxygen-ion conductors. This Progress Report describes recent developments in electrolyte, anode, and cathode materials for protonic SOFCs, addressing the issue of chemical stability, processability, and good power performance below 600 °C. Different fabrication methods are reported for anode-supported SOFCs, obtained using state-of-the-art, chemically stable proton-conducting electrolyte films. Recent findings show significant improvements in the power density output of cells based on doped barium zirconate electrolytes, pointing out towards the feasibility of the next generation of protonic SOFCs, including a good potential for the development of miniaturized SOFCs as portable power supplies. Recent developments in electrolyte, anode, and cathode materials for protonic SOFCs are here reported, addressing the issue of chemical stability, processability, and good power performance below 600 °C. Recent findings show significant improvements in the power density output of cells based on doped barium zirconate electrolytes, pointing out towards the feasibility of the next generation of protonic SOFCs. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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
Application of a TES micro-calorimeter as high-energy resolution detector for hard X-rays at a synchrotron beam line
No full textA superconducting transition edge sensor microcalorimeter was tested at the synchrotron radiation beam-line of the ESRF to collect the X-ray fluorescence spectrum of a Renaissance gold lustre on ceramic. The measured energy resolution of the detector in the range 6-9 keV was 70 eV, i.e. 3 times better than that of the usual solid state detector. The preliminary data collected demonstrate the applicability of these detectors to the energy dispersive X-ray spectroscopy at the synchrotron radiation facilities
Application of a TES micro-calorimeter as high-energy resolution detector for hard X-rays at a synchrotron beam line
No full textA superconducting transition edge sensor microcalorimeter was tested at the synchrotron radiation beam-line of the ESRF to collect the X-ray fluorescence spectrum of a Renaissance gold lustre on ceramic. The measured energy resolution of the detector in the range 6-9 keV was 70 eV, i.e. 3 times better than that of the usual solid state detector. The preliminary data collected demonstrate the applicability of these detectors to the energy dispersive X-ray spectroscopy at the synchrotron radiation facilities
Effect of dopant-host ionic radii mismatch on acceptor-doped barium zirconate microstructure and proton conductivity
No full textIn the present study, morphological and electrical 'properties of BaZrO3 were investigated as a function of the ionic radii mismatch between Zr and,the different B-site dopants (Al, Se, In, Lu, Tm, Y, Gd,.Sm, Nd, and La) for the same solute concentration and valence. Our study highlights the critical-role of the ionic radius,of the acceptor dopant on stability, sinterability, and proton conductivity of barium zirconate. From our study, Gd-doped barium zirconate emerges as a novel promising material for proton conductor electrolytes
- …
