1,721,117 research outputs found
Conducting Polymers: New Electrochromic Materials for Advanced Optical Devices
No full textThe basic properties of conducting polymers which can be coloured by reversible electrochemical doping processes, are briefly described. The application of these materials for the development of optical devices of technological importance, such as electrochromic displays and windows, is also illustrated and discusse
CHARACTERIZATION OF POLY(ETHYLENE OXIDE) COPPER SALT POLYMER ELECTROLYTES
No full textThe physico-chemical and electrochemical properties of a new class of polymer electrolytes formed by complexes of poly(ethylene oxide) and copper trifluorosulphonate salts have been investigated. The results suggest that these electrolytes are good copper ion conductors. Under particular conditions of concentration and temperature, and apparent electronic transport has also been evidenced
Ambient-temperature Lithium Polymer Rocking-chair Batteries
No full textA novel type of solid-state lithium rocking-chair battery, employing titanium disulfide as the negative lithium sink electrode, lithium cobalt oxide as the lithium source positive electrode, and a highly conductive gel-type polymer membrane as the electrolyte has been fabricated and evaluated. The data reported here demonstrate that the rocking-chair concept may be applied to various combinations, which, starting from the well-established C-LiMO2 (M = Co, Ni) may expand to others involving alternative electrode materials of which TiS2 is a promising example
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
Characteristics of sodium batteries using a layered P2-type, Na0.5Ni0.11Fe0.22Mn0.66O2 cathode and a nanostructured Sb-C anode in NaTFSI-PYR14TFSI electrolyte
No full textNa-based storage systems working at room-temperature have recently gained the interest of the research community thanks to the large availability and low cost of sodium.[1,2]
The real challenge in the sodium-based battery field is represented by the substitution of the extremely reactive metallic sodium anode that represents a serious issue to face in order to increase the intrinsic safety of the sodium cells.
To further improve the safety level of sodium cells, we propose here the substitution of the more common organic-carbonate based electrolytes with an ionic liquid-based electrolyte characterized by higher thermal stability, lower volatility and non flammability.[4]
We present here two electrode materials characterized by improved morphology and enhanced electrochemical behavior in terms of cycle stability and delivered capacity.
A P2-type, Na0.5Ni0.11Fe0.22Mn0.66O2 transition metal layered oxide as cathode material and a nanostructured Sb-C alloying anode, have been studied in a 0.2m NaTFSI-PYR14TFSI electrolyte.
The materials have been investigated through morphological analysis in order to get structural parameters and characteristics. Furthermore, electrochemical tests were performed to check the influence of the IL-based electrolyte in sodium cells
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