1,720,958 research outputs found
Cella elettrolitica per la produzione di Fluoro
No full textViene descritto il progetto di una cella per la produzione elettrolitica del fluoro con una capacità di 2400 Amp. e con soluzioni tecnologiche innovative
Production of MoF6 via electrochemical fluorination
No full textMoF6 is an efficient reagent for the transformation of carbonylic compounds into gem-difluorinr-derivatives. MoF4 was the starting material for the production of MoF6 by electrochemical fluorination in HF
Identification of some isomeric chloro-nitro derivatives of a,a,a-trifluorotoluene
No full textseveral isomeric chloronitro derivatives of a,a,a-trifluorotoluene have been prepared by mono and dinitration experiments. These compounds have been isolated from the reaction mixture with high purity and identified by H-NMR
The electochemical fluorination of organic compounds: further data in support of the ECbECn mechanism
No full textData in support of the four-stage mechanism ECbECN result from the electrochemical fluorination of some acyl halides (benzoyl, n-butyryl and iso-butyryl, benzenesulphonyl and p-toluenesulphonyl chlorides) and amines (tripropylamine and N-methylmorpholine)
Thermal decomposition of perfluoroalkanesulfonyl fluorides: the pyrolysis of perfluoro-n-octane-1-sulfonyl fluoride
No full textThe preliminary data obtained from thermal decompositions of perfluoro-n-octane-1-sulfonyl fluoride in a continuous tubular-flow reactor are reported The pyrolysis results in a radical reaction producing fluorocarbons
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
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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