1,721,043 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
A Short, Versatile Route Towards Benzothiadiazinyl Radicals
Full text linkA family of substituted 1,2,4-benzothiadiazine 1-chlorides have been prepared by treatment of N-arylamidines in neat
thionyl chloride at reflux. The S(IV) 1-chlorides are readily reduced under mild conditions to persistent 1,2,4-
benzothiadiazinyl radicals which have been characterised by EPR spectroscopy and cyclic voltammetry. Crystallographic
studies on isolated radicals indicate that the radicals dimerise via pancake bonding in the solid-state, resulting in
spin-pairing and net diamagnetism
A Comparison of the Oxidative Addition Chemistry of Tetrathiocins to p- and d- Block Elements
Full text linkThis thesis describes the oxidative addition of 1,2,5,6-tetrathiocins to low valent transition metals and p-block elements. Chapter 1 provides a literature review of tetrathiocin reactivity and the related dithiete chemistry for both the p- and d-block elements. Chapter 2 describes the synthesis of a library of tetrathiocins used extensively through the rest of this thesis alongside the synthesis of a series of group 10 dithiolate complexes through the oxidative addition of tetrathiocins to M2dba3 (M = Pd or Pt) in the presence of the chelating phosphines dppe and dppf to generate complexes of general formula M(dt)(dppe) and M(dt)(dppf) [M = Pd, Pt, dt = benzenedithiolate derivatives]. The coordination chemistry of complexes bearing benzo-15-crown-5-dithiolate ligands, M(15- c-5-bdt)(dppe) and M(15-c-5bdt)(dppf) with Na+ ions was probed through UV-Vis spectroscopy, X-ray diffraction and electrochemical studies. These revealed formation of 1:1 complexes [M(Na-15-c-5-bdt)(dppe)][BPh4] and [M(Na-15-c-5-bdt)(dppf)][BPh4] (M = Pd, Pt). Chapter 3 describes the oxidative addition of tetrathiocins to the Co(I) complex, CpCo(CO)2, generating the 16e- Co(III) complexes, CpCo(dt) and/or the 18e- complexes [CpCo(dt)]2, depending on the nature of the tetrathiocin. In the case of the dimethoxybenzene dithiolate (dmobdt2-) derivative, both monomeric CpCo(dmobdt) and dimeric [CpCo(dmobdt)]2 species could be isolated in the solid state depending upon crystal growth conditions. CpCo(dmobdt) was found to undergo an unusual mechanochemical solid state transformation to the denser [CpCo(dmobdt)]2 phase upon grinding. Chapter 4 describes the synthesis of the benzo-15-crown-5 and benzo-18-crown- 6 dithiolate complexes CpCo(15-c-5-bdt) and CpCo(18-c-6-bdt). In contrast to the group 10 chemistry described in Chapter 2, spectroscopic studies in solution and crystallographic studies in the solid state indicated that CpCo(15-c-5-bdt) was found to coordinate to the alkali metal ions Na+, K+, Rb+ and Cs+ to form 2:1 complexes [A{CpCo(15-c-5- bdt)}2][BPh4] (A = Na, K, Rb, Cs). Chapter 5 describes the one-pot synthesis of a series of substituted nickel(II)dithiolate bipyridine ‘push-pull’ complexes, Ni(bdt)(bpy), via oxidative addition chemistry of tetrathiocins to Ni(COD)2 in the presence of chelating bipyridine ligands. The spectroscopic properties of the visible absorption maxima were sensitive to solvent and substituent effects. Empirical correlations were identified for both the solvatochromic effect and the electronic properties of the functional group attached to the bipyridine ligand. EFISH measurements revealed large molecular hyperpolarizabilities, comparable with previously reported Ni(II) dithiolate/diimine complexes. Chapter 6 examines the oxidative addition chemistry of tetrathiocins to Ge(II) in the form of GeCl2∙dioxane to afford Ge(bdt)2 derivatives. The dimethoxybenzenedithiolato complex, Ge(dmobdt)2 was found to be polymorphic and the phase stability examined through DSC and VT-PXRD studies
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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