1,720,990 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
A new species of Uvaria (Annonaceae) from Southeast Asia
Get PDFA new species, Uvaria vietnamensis C. Meade (Annonaceae), is described and illustrated. Resembling U. calamistrata Hance, this species is distinguished by its tomentose bearded fruit. The type material includes Poilane collections from Vietnam that were originally listed under “Uvaria fauveliana Pierre” by JOVET-AST (1938). The status of this latter taxon is also discussed
A phylogeographic study of Arenaria ciliata and Arenaria norvegica in Ireland and Europe
Get PDFThe unusual distribution of Irish ora and fauna has intrigued and eluded biogeographers for centuries and remains the subject of ongo- ing debate. The conventional hypothesis for the postglacial coloniza- tion of Ireland across an Irish-British land-bridge has come under in- creasing scrutiny, with a growing body of evidence suggesting Ireland may have been a refugium during the last glacial cycle. In addition a strong affinity to Iberian populations is evident among much of the islands's native ora and fauna. This study focused on the disjunctly distributed arctic-alpine plant Arenaria ciliata, and its close arctic relative, A. norvegica, in an effort to characterise and date the earli- est links between Ireland and Continental Europe and to investigate the possibility for in situ survival of populations of these species in Ireland during the last glacial maximum. Twenty-nine populations of the target species were sampled through- out their range in Europe. Four separate chloroplast regions were sequenced: psbA-trnH, rpl32 -trnL, trnK -matK and matK, and the in- ternal transcribed spacer region of the nuclear ribosomal DNA (ITS). The chloroplast and ITS sequences were analyzed using maximum likelihood, haplotype networks, and a molecular clock analysis using Bayesian inference. Amplified fragment length polymorphism (AFLP) markers were generated for all populations sampled using three selec- tive primers and the obtained data were analysed using neighbour- joining analysis, networks, AMOVAs and direct analysis of the frag- ments. The results indicate a complex glacial history for these two species, where the consensus of the analysis demonstrates phylogeographic patterns indicative of Pleistocene glacial survival in situ, with evi- dence for cryptic refugia in Ireland, Rum and Svalbard, and multiple colonization events for A. ciliata. In contrast, the phylogeographic patterns obtained for A. norvegica are, for the most part, typical of a recent post-glacial expansion, with very low sequence divergence between individuals and populations. Evidence for in situ survival of the Ben Bulben population of A. ciliata is presented. This population contains multiple unique hap- lotypes, many private AFLP fragments, distinct genetic structuring and the molecular clock analysis indicates an ancient divergence for the Ben Bulben population. This indicates an origin for this resident population much earlier than the last glacial maximum, predating the origin of the A. norvegica haplotypes. AFLP genotypes show distinct grouping for the Ben Bulben and Svalbard populations. Similari- ties in the genetic distinctiveness of populations from Rum, Svalbard and Ben Bulben indicate the possiblity that these locations represent cryptic Pleistocene refugia for A. ciliata. Taxonomic distinctions between A. ciliata and A. norvegica are com- plex, though, a distinct genetic grouping for individuals of A. norvegica is demonstrated, albeit as a monophyletic group within A. ciliata. In- congruences between the chloroplast and nuclear ITS sequences con- found this issue, and highlight the possibility of hybridisation events between these species. AFLP markers show a distinct clustering for A. norvegica genotypes and demonstrate the suitability of AFLP markers in discriminating between closely related taxa. None of the recognized subspecies of the A. ciliata complex could be clearly discriminated based on the molecular markers implemented in this study. This study provides the first evidence for the survival of a terrestrial plant species in situ in Ireland throughout the Pleistocene glacial cycles.Synthesys (ES-TAF-1599) who provided funding for the lab work carried out in the Royal Botanic Gardens in Madrid.Peer reviewe
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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