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Richargeable compact Li cells with Li1+xV3O8 , LixCr0.9V0.1S2 and LixMnO2 cathodes and ether based electrolytes
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Behaviour of the Lithium electrode during cycling in nonaqueous solution.
No full textThe behaviour, in different electrolyte, of Li during cycling in anode limited close packed cells has been studied. The highest efficiency (E) at a current density of 4 mA cm-2 and a charge density of 2 mA h cm-2 is obtained in LiAsF6 containing a mixture of THF/2-MeTHF with 2 vol.% 2MeF. The effect on E of current density and depth of discharge in ether solutions has also been examined. The charge of polarization resistance, ohmic drop in the solution and geometric capacitance with cycling, has been investigated by the galvanostatic pulse method. An assumption for the Li passivation observed during cycling in ether electrolytes is discussed
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
RECHARGEABLE COMPACT LI CELLS WITH LIXCR0.9V0.1S2 AND LI1+XV3O8 CATHODES AND ETHER-BASED ELECTROLYTES
No full textThe electrochemical parameters of compact disk cells with cathodes of Li1+xV3O8, LiCr0.9V0.1S2, and electrolytes based on cyclic ethers, are studied. It is shown that the decrease of discharge time from 10 to 1.3h has but a small effect on cathode utilization, which drops from 80% to about 70% for both cathode materials. The polarization resistance of freshly deposited Li, from electrolytes of ethers, and their mixtures with ethylene carbonate, are identical. Continuous cycling tests with maximum cathode utilization in the electrolyte of composition 1.5M LiAsF672MeTHF/THF(1:1)/0.2% 2MeF demonstrate a cycling efficiency of 96-97% for Li. A lower efficiency of about 94% is obtained in ethylene carbonate containing electrolytes. It is suggested that an increase in the thickness of the passive film formed on the Li electrode is responsible for the capacity decay at the end of the cycling life. The rate of self-discharge at room temperature for a fully charged cell is about 5-8% per month. This self-discharge is attributed to the Li electrode, which is passivated during storage in the ether-based electrolytes
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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