1,721,003 research outputs found
A facile synthesis procedure for sulfonated aniline oligomers with distinct microstructures
Get PDFWell-defined sulfonated aniline oligomer (SAO) microstructures with rod and flake morphologies were successfully synthesized using an aniline and oxidant with a molar ratio of 10:1 in ethanol and acidic conditions (pH 4.8). The synthesized oligomers showed excellent dispersibility and assembled as well-defined structures in contrast to the shapeless aggregated material produced in a water medium. The synergistic effects among the monomer concentration, oxidant concentration, pH, and reaction medium are shown to be controlling parameters to generate SAO microstructures with distinct morphologies, whether micro sheets or micro rods.Ramesh Karunagaran, Campbell Coghlan, Diana Tran, Tran Thanh Tung, Alexandre Burgun, Christian Doonan and Dusan Losi
Some reactions of azides with diynyl-bis(phosphine)ruthenium-cyclopentadienyl complexes
Get PDFAbstract not availableMichael I. Bruce, Alexandre Burgun, Jonathan George, Brian K. Nicholson, Christian R. Parker, Brian W. Skelton, Nancy Scoleri, Christopher J. Sumby, Natasha N. Zaitsev
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
Kinetically controlled porosity in a robust organic cage material
No full textSimultaneously published in: Angewandte Chemie-International Edition 125(13):3834-3837 2013 (http://dx.doi.org/10.1002/ange.201209922)Won by the hare: A new crystalline microporous solid was prepared that is composed of discrete organic cages made entirely from carbon-carbon bonds. The porosity of this material can be controlled by simple kinetic methods, which afford reproducible access to either a non-porous or porous polymorph. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Antonio Avellaneda, Peter Valente, Alexandre Burgun, Jack D. Evans, Adrian W. Markwell- Heys, Damien Rankine, David J. Nielsen, Matthew R. Hill, Christopher J. Sumby, and Christian J. Doona
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
Some cyclic ligands obtained from reactions of polycyanocarbon-metal complexes
No full textDedicated to our friend and colleague Claude Lapinte on his 65th birthday, in recognition of his extensive contributions to organo-iron chemistry.Abstract not availableMichael I. Bruce, Alexandre Burgun, Martyn Jevric, Jonathan C. Morris, Brian K. Nicholson, Christian R. Parker, Nancy Scoleri, Brian W. Skelton, Natasha N. Zaitsev
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
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