1,720,985 research outputs found
Efficiency enhancement of the electrocatalytic reduction of CO2: fac-[Re(v-bpy)(CO)3Cl] electropolymerized onto mesoporous TiO2 electrodes
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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
Electrochemical and Electrochromic investigation of polybithiophene films on a mesoporous TiO2 surface
No full textThe electrochemical behaviour and the electrochromic properties of a film of poly-bithiophene (PBT) deposited onto a mesoporous TiO2 surface layered on an optically transparent electrode (OTE) were investigated. The polymeric film was prepared by anodic polymerisation of 2,2′-bithiophene (BT) and, interestingly, a cyclic voltammetric (CV) behaviour very similar to that observed on platinum or other conducting substrates was obtained. Furthermore, both the CV pattern and the absorption properties of the film grown on TiO2 indicated that a significantly larger amount of PBT could be deposited onto the mesoporous TiO2 layer with respect to Pt or conducting SnO2 substrates having the same geometric area. This suggested that PBT growth, besides at the exposed SnO2 surface within the pores of the mesoporous network, might also occur onto the (very large) surface of the TiO2 nanocrystals. Finally, the PBT/TiO2 heterojunction was investigated for its electrochromic properties. Because of the very large specific surface concentrations of PBT and the high volume density of surface-related defects in the mesoporous TiO2 film, the hetrojunction was shown to undergo sharp optical transition upon either oxidation of the PBT film or intercalation of Li+ ions in the reduced TiO2 film
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
Electrode Surface Modification by a Spirobifluorene Derivative. An XPS and Electrochemical Investigation
No full textOrdered thin layers of a spirobifluorene derivative containing an amino group were formed by grafting them
onto a self-assembled monolayer (SAM) of 11-mercaptoundecanoic acid (11-MUA) on gold. Either physical
(H-bonding) or chemical bonding (activated by EDCl) was investigated. X-ray photoelectron spectroscopy
and electrochemical impedance spectroscopy confirmed that both methods can be used to effectively graft
2-amino-9,9¢-spirobifluorene molecules onto the SAM surface, giving high surface coverages, with a
significantly higher packing in the case of chemisorbed films. EIS measurements also showed that the covalently
bonded spirobifluorene SAMs act as an effective barrier to both ion penetration and heterogeneous electron
transfer
Structural and electrochemical characterization of fullerene-based surfaces of C60 mono- or bis-adducts grafted onto self-assembled monolayers
No full textSingle layers of C60 mono- and bis-adducts have been obtained by functionalizing an acid-terminated self-assembled monolayer
(SAM) of thiols on gold. X-ray photoelectron spectroscopy demonstrated the grafting onto the SAM by covalent bonding, via the formation
of an amide bond, while cyclic voltammetry and electrochemical impedance spectroscopy provided information on the redox
properties of the C60-films, as well as on structural characteristic
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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