1,720,960 research outputs found
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
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
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
Synthesis and anion coordination chemistry of novel mono- and bifunctional borylmetallocenes
Full text linkThe synthesis, characterisation and anion binding properties of a series of bifunctional boryl-substituted ferrocene systems, and monofunctional boryl-substituted ferrocene and cymantrene systems are reported. Thus, the bis-borylated ferrocene systems: Fe rj5-C5H4B(OR)2 2 and Fe n5-C5H4Bcat 2 where (OR)2 = OCH(Ph)CH(Ph)0 (la) or OCH2CH(2-napthyl)0 (5a), and cat = catecholate (2a), 3,5-di-terr-butylcatecholate (3a), or 3-methoxycatecholate (4a) and the mono-borylated ferrocenes and cymantrenes (t 5-C5H5)Fe r 5-C5H4B(OR) 2 (lb), -n.5-C5H4B(OR)2 Mn(CO) 3 (7), (n5-C5H5)Fe n5-C5H4Bcat (2b), and n5-C5H4Bcat Mn(CO)3 (8) where (OR) 2 = OCH(Ph)CH(Ph)0 and cat = catecholate have been synthesised and characterised by NMR, UV/Vis and IR spectroscopy, mass spectrometry, elemental microanalysis, and in most cases by X-ray diffraction. Electrochemical analyses of all ferrocene-based compounds has demonstrated the electronic and redox properties associated with boryl-substituted metallocenes, and allowed a comparison to be made between mono- and disubstituted systems. The anion binding characteristics of the borylated metallocenes and half-sandwich compounds have been probed by spectroscopic (including NMR, UV/Vis, fluorescence and IR spectroscopy) and electrochemical techniques, revealing a specific affinity for binding of the fluoride ion. Binding is shown to occur through monodentate coordination of fluoride, even for the bifunctional Lewis acids such that two equivalents of the anion are bound by the ferrocenyl-host system. In particular, the bis-borylferrocene receptors display remarkable behaviour on complexation of two equivalents of fluoride, such that a colorimetric response is observed on fluoride binding, attributable to the redox chemistry of the ferrocene moiety to which the binding site is covalentfy linked. The synthesis, characterisation and potential hydrogen fluoride binding capabilities of mixed Lewis acidic boron-Lewis basic nitrogen containing systems are also presented here. Both (ri5-C5H 5)Fe ri5-C5H4B(OCH2CH2)NCH 3 (9a) and (n5- C5H5)Fe r 5-C5H 4B(OR)2 where (OR)2 = OCH2CH(CH 2NC5Hi0)O (10a) have been synthesised and characterised by standard techniques, and the former shown by X-ray diffraction to display an intramolecular N-B dative bond. In addition to these newly synthesised Lewis acid-Lewis base-containing systems, hydrogen fluoride binding studies involving the literature compound 2-(AAdimethylaminomethyl)ferrocene boronic acid (11a) are also presented. Analyses of the reactions of different hydrogen fluoride sources with these three compounds have been performed via NMR spectroscopy, electrochemistry, and in the cases of 9a and 11a, by X-ray crystallography. The results indicate that HF treatment of 9a and 10a, causes B-0 bond cleavage leading to loss of the amine function. The Lewis basic component is preserved in the treatment of 10a with HF, however, leading to formation of an HF adduct
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Fluoride anion binding by cyclic boronic esters: influence of backbone chelate on receptor integrity
No full textA systematic investigation of fluoride anion binding properties as a function of chelate backbone has been carried out for ferrocene functionalised boronic esters of the types FcB(OR)(2) and fc[B(OR)(2)](2) [Fc = ferrocenyl = (eta(5)-C5H5) Fe(eta(5)-C5H4); fc = ferrocendiyl = Fe(eta(5)-C5H4)(2)]. Cyclic boronic esters containing a saturated five- or six-membered chelate ring are readily synthesized from ferrocene, and selectively bind fluoride via Lewis acid/base chemistry in chloroform solution. The resulting complexes are characterized by relatively weak fluoride binding ( e. g. K = 35.8 +/- 9.8 M-1 for FcBO(2)C(2)H(2)Ph(2)- S, S), and by cathodic shifts in the ferrocene oxidation potential that form the basis for electrochemical or colorimetric fluoride detection. The fluoride selectivity of these systems is attributed to relatively weak Lewis acidity, resulting in weak F- binding, and essentially no binding of potentially competitive anions. By contrast, more elaborate Lewis acid frameworks based on calix[4] arene (calixH(4)), such as (FcB)(2)calix or fcB(2)calix, do not survive intact exposure to standard fluoride sources (e.g. [(Bu4N)-Bu-n] F center dot xH(2)O solutions in chloroform or acetonitrile). Instead B - O bond cleavage occurs yielding the parent calixarene; the differences between alkoxo- and aryloxo-functionalised derivatives can be rationalised, at least in part, by consideration of the differences in electron donating capabilities of RO( R = alkyl, aryl)
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