1,720,954 research outputs found
Double-layer correction for electron-transfer kinetics at glassy carbon and mercury electrodes in N,N-dimethylformamide
No full textThe double-layer properties of the glassy carbon electrode in N,N-dimethylformamide (DMF) containing
tetrabutylammonium perchlorate (TBAP) at different concentrations have been studied by cyclic voltammetry and
impedance. The results were compared with analogous results obtained for the mercury/DMF interface. For both
electrodes, the double-layer data were treated to obtain useful equations describing the dependence of the outer
Helmholtz plane potential on the applied potential. The kinetics of the dissociative reduction of a sulfide in DMF/
0.1 M TBAP was studied by convolution analysis on both glassy carbon and mercury and used as an example to test
the double-layer results and compare the behavior of the two electrodes
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Electron transfer to sulfides and disulfides: Intrinsic barriers and relationship between heterogeneous and homogeneous electron-transfer kinetics
No full textThe electron-acceptor properties
of series of related sulfides and
disulfides were investigated in N,N-dimethylformamide
with homogeneous
(redox catalysis) and/or heterogeneous
(cyclic voltammetry and convolution
analysis) electrochemical techniques.
The electron-transfer rate constants
were determined as a function of the
reaction free energy and the corresponding
intrinsic barriers were determined.
The dependence of relevant
thermodynamic and kinetic parameters
on substituents was assessed. The kinetic
data were also analyzed in relation
to corresponding data pertaining
to reduction of diaryl disulfides. All investigated
reductions take place by
stepwise dissociative electron transfer
(DET) which causes cleavage of the
CalkylS or SS bond. A generalized
picture of how the intrinsic electrontransfer
barrier depends on molecular
features, ring substituents, and the
presence of spacers between the frangible
bond and aromatic groups was established.
The reduction mechanism
was found to undergo a progressive
(and now predictable) transition between
common stepwise DET and
DET proceeding through formation of
loose radical anions. The intrinsic barriers
were compared with available results
for ET to several classes of dissociative-
and nondissociative-type acceptors,
and this led to verification that
the heterogeneous and the homogeneous
data correlate as predicted by the
Hush theory
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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