1,720,956 research outputs found
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
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
Investigating the Effect on a Metal Pincer Complex when Fluorine, Carbon and Silicon based Electrophiles are Introduced into the Ligand Backbone
No full textSynthesis and investigation of phosphorus peri-substituted acenaphthenes
No full textThe work presented in this thesis builds upon previous investigations by the Kilian group into dealkacoupling reactions of phosphorus peri-substituted acenaphthenes. The focus of this thesis was to investigate the effect of introducing different aryl substituents into the peri region on dealkacoupling and to determine the switching behaviour of these compounds. The effect of introducing other pnictogens (As, Sb) was also investigated.
Previously the Kilian group has reported a novel method for the synthesis of ferrocenyl and dichloroferrocenylphosphine via a dithiadiphosphetane. This synthetic route was expanded beyond ferrocene to allow access to both novel and known primary/dichlorophosphines in good yields and without the need for purification.
A series of novel bis(phosphine) peri-substituted acenaphthene compounds with aryl substituents bearing differing steric and electronic properties was synthesised. These compounds were investigated for their ability to undergo dealkacoupling under conditions previously used by the Kilian group (75°C in the presence of a radical initiator (AIBN) and by exposure to sunlight). Results from both the thermal and light induced dealkacoupling reactions indicate that sterics play an important role as a greater steric profile may impede any free rotation necessary. In addition, light induced dealkacoupling reactions revealed the formation of both cis and trans isomers in varying ratios dependant on the nature of the aryl substituent. Introduction of arsenic into the peri region showed favourable results with dramatic reductions in reaction time compared with comparable P/P systems. P/Sb peri-substituted compounds displayed interesting reactivity forming Sb-Sb bonds through dehydrocoupling and the double activation of C-Cl bonds in DCM, which has never been seen in peri-substituted acenaphthenes previously.
Investigations into the molecular switching behaviour of the P/P and P/As systems demonstrated that peri-substituted acenaphthenes do possess molecular switch like properties. The effectiveness of these compounds as molecular switches relies heavily on the nature of the substituents, with low steric profile high electron rich moieties giving the most favourable results. Interestingly, the P/As system showed improved switching properties in comparison to the P/P. Full conversion to the relevant cis isomers was unfortunately not achieved and this should be an area of significant research in the future
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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