1,720,984 research outputs found
Electrochemical characterization of titanium oxide nanotubes
No full textTo evaluate the possibility of using nanosized TiO2to replace the carbonaceous materials usuallyemployed as the negative electrode of lithium-ion batteries, we studied and compared the electrochem-ical performance of TiO2nanotubes with a commercial material (P25 Degussa). TiO2nanotubes wereprepared by electrochemical anodization of titanium sheets. The nanotubes were characterized by usingSEM and XRD. Composite electrode tapes were made by roll milling the TiO2nanotubes and the TiO2P25 Degussa with carbon and Teflon. The electrodes were electrochemical characterized in lithium cellby charge/discharge cycles. The electrochemical tests comprised low rate cycling, cycling at C/rate andcycling at different rates
TyzorTM-LA used as a precursor for the preparation of carbon coated TiO2
No full textIn this paper the preparation, the morphology, the structure and the electrochemical performance of carbon coated TiO2 produced by using Tyzor®-LA as a precursor have been studied by using SEM, XRD and electrochemical methods. The electrochemical methods included low rate cycling, cycling at C-rate and cycling at different rates. At the same time the physical and electrochemical properties of LiFePO4 were investigated by using the same methods. Lithium-ion batteries were prepared by sandwiching a glass fiber between a TiO2 electrode used as the anode and a LiFePO 4 electrode used as the cathode and tested to evaluate cell performance
TiO2 nanotubes photo-anode: an innovative cell design
No full textPhotocatalytic properties of titanium dioxide make it an extremely useful material in the field of renewable energy. Here we describe an electrochemical cell with an innovative design in which the anode consists of an array of highly ordered TiO2 nanotubes on porous nickel. Such a combination of materials renders this system able to work both in dark and under solar light exposure, thus opening new perspectives for industrial-scale applications
TiO2 nanotubes for photoelectrocatalytic water splitting: an innovative cell design
No full textPhotocatalytic properties of titanium dioxide make it an extremely useful material in the field of renewable energy. Here we describe an electrochemical cell with an innovative design in which the anode is constituted by an array of highly ordered TiO2 nanotubes on porous nickel. Such a combination of materials makes our system able to work both in dark and under solar light exposure, thus opening new perspectives for industrial-scale application
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
Prominent Progress in Polysulfone-Based Anion Exchange Membrane Fabrication by Electrospinning
No full textDeveloping cost-effective anion exchange membranes (AEMs) with boosted ionic conductivity, desired mechanical properties, and sufficient alkaline stability remains a significant challenge in manufacturing. We've made great progress in producing an intrinsic AEM by electrospinning with a blended solution of polysulphone and Fumion® (a commercial ionomer solution from Fuma-Tech, Germany), followed by characterization tailored for water electrolyzer applications. Our results demonstrate significant potential for propelling the manufacturing of a novel breed of electrospun AEMs optimized for hydrogen production. The outcome represents a prominent improvement over our initial endeavor, which is a big step forward in our goal to make manufacturing easier and create top-notch AEMs for hydrogen production
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
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
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