1,720,984 research outputs found
Impedance spectroscopy study of PEG-based nanocomposite polymer electrolytes
No full textThe addition of nanometric fillers (e.g., SiO2, TiO2) to P(EO)(n)LIClO4 polymer electrolytes induces consistent improvement in the transport properties. The increase in conductivity and in the cation transference number is attributed to the enhancement of the degree of the amorphous phase in the polymer matrix, as well as to some acid-base Lewis type, ceramic-electrolyte interactions. This model is confirmed by results obtained from a detailed impedance spectroscopy study carried out on poly(ethylene oxide) [P(EO)]-based polymer electrolyte samples with and without ceramic fillers. (C) 2000 The Electrochemical Society. S0013-4651(99)10-094-6. All rights reserved
A LiTi2O4 – LiFePO4 novel lithium-ion polymer battery
No full textA new type of lithium-ion polymer cell based on a LiTi2O4 anode, a LiFePO4 cathode and a PVdF-based gel electrolyte is reported and discussed. The cell operates with a very flat voltage profile evolving around 2 V and cycles with negligible capacity fading and with a high rate. These features, combined with the low cost and the low toxicity of the components make the cell of practical interest as an inexpensive, disposable, thin-layer, plastic-like power source for the 1.5 V consumer electronic market. (C) 2002 Published by Elsevier Science B.V
Un nuovo metodo per valutare le proprietà antiradicaliche di tessuti vegetali per usi alimentari
No full textin "Atti" del IV Congresso Nazionale di Chimica degli Alimenti, Universita' Ferrara (Publ.), Ferrar
SOD Biosensors to Determine Free Radicals and to Evaluate Radical Scavenging Properties both of Hydrophilic and Hydrophobic Compounds
No full textNew biosensor for superoxide radical used to evidence molecules of biomedical and pharmaceutical interest having radical scavenging properties
No full textA superoxide dismutase biosensor was used to determine the antioxidant properties of scavenger molecules and the antiradical activity of healthy and diseased human kidney tissues; this biosensor is based on the use of the enzyme superoxide dismutase (SOD), which is physically entrapped in a kappa-carrageenan gel membrane, and of a transducer consisting of an amperometric hydrogen peroxide electrode. Several compounds with scavenging properties were tested, including some commercial drugs. (C) 2000 Elsevier Science B.V. All rights reserved
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
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