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Progetto per l’ ex- Breda a Pistoia, G. De Carlo/Ilaud, 1980; Esposizione Internazionale Colombiana del 1992, Porto antico di Genova, R. Piano/Building Workshop
No full textschede sul Progetto per l’ ex- Breda a Pistoia, G. De Carlo/Ilaud, 1980; Esposizione Internazionale Colombiana del 1992, Porto antico di Genova, R. Piano/Building Workshop per un numero monografico sull'Itali
Redox mechanism and cycling behaviour of nonylbenzo-hexaquinone electrodes in Li cells
No full textNonylbenzo-hexaquinone (NBHQ), a quinonoid polymer of low molecular weight, has been reinvestigated as a cathode material for Li cells. Its reduction mechanism gives rise at first, in a 3-electron process, to an irreversible species involving the formation of radical anions. Successively, a direct two-electron reduction of other quinone groups occurs. This second step, which involves 4 e in quasi-thermodynamic conditions, is reversible and allows cells of the type Li/LiClO4-PC,DME/NBHQ,C to be cycled for more than 500 cycles at the C/2 rate between 3.5 and 2.0 V. The average energy density during this cycling was 160 Wh/kg, based on the weight of the cathode material (additives included). © 1987
Transport and equilibrium characteristics of Î3-lithium vanadium bronze
No full textThe diffusion coefficient of Li+ in the Î3-lithium vanadium bronze (Li1+xV3O8) has been measured with the long-pulse galvanostatic technique. Values ranging from 1.7×10-7 cm2s-1, at x=0.3, to 2.2×10-8 cm2s-1, at x= 1.4, have been measured. The thermodynamic factors, d ln a/d ln c, determined from the OCV/x curve and from voltage relaxation after the current pulse, have a mean value of âˆ1⁄415. The pseudo two-phase region observed in the OCV/x curve at high Li+ concentrations seems attributable to ordering of Li+ in specific sites and to alteration of the unit cell. This process is reversible as shown by X-ray diffractometry. Finally, from OCV/t plots at different x, the partial molar entropy of Li+ was determined. The values, on account of the large dE(x)/dt measured, are higher than those found for V6O13 or TiS2. © 1987
Behaviour of polyaniline electrodes in aqueous and organic solutions
No full textPolyaniline (PAn) has been obtained in acidic solutions, chemically (by oxidation with (NH4)2S2O8), and electrochemically (by potential. The reduction/oxidation processes of PAn are basically the same in aqueous acidic solutions and in Li+-containing organic solutions. The fully oxid. © 1988
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
Study of amorphous and crystalline lithium vanadium oxide (Li1+xV3O8) by FTIR, XAS and electrochemical techniques.
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