1,721,134 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
Untersuchung europäischer Sorten und genetischer Ressourcen des Hafers auf Resistenz gegen den Haferflugbrand
Full text linkFür den ökologischen Anbau von Hafer besitzt der Haferflugbrand ein hohes Schadenspotenzial. Ein effektiver Lösungsansatz für dieses Problem wäre eine gezielte Resistenzzüchtung, wofür grundlegende Fragestellungen im Rahmen eines im BÖL geförderten Projektes zu untersuchen waren. Dazu gehörte die Frage nach der genetischen Variation für Flugbrandresistenz im aktuellen europäischen Hafersortiment und in Genbankakzessionen, um die Resistenzzüchtung auf breiter genetischer Basis aufbauen zu können. Im vorliegenden Beitrag werden Ergebnisse der Resistenzprüfungen im Gewächshaus und Freiland vorgestellt.
Zur Resistenzprüfung wurde Saatgut von 162 Sorten und Zuchtstämmen sowie 216 Genbankherkünften mit dem Sporengemisch von zwei Flugbrandherkünften aus Neu Darchau bzw. dem Dottenfelder Hof bei einer Inokulumdichte von 1 g/l und -800 mbar Unterdruck inokuliert.
Die zweiortige Resistenzprüfung (Groß Lüsewitz und Darzau Hof) und auch die beiden Gewächshausscreenings zeigten bei 4 aktuell zugelassenen, 16 älteren bzw. ausländischen Sorten sowie 9 Genbankakzessionen ein sehr hohes Resistenzniveau. Letzteres hängt jedoch auch von den Prüfumwelten ab, was anhand der wiederholten Prüfung von 26 Sorten im Freiland und im Gewächshaus deutlich wurde. So mussten anhand der Gewächshausergebnisse 9 von 26 Sorten, die zuvor im Freiland nur wenig befallen waren, als anfällig eingestuft werden. Da es sich vorwiegend um rassenspezifische Resistenzen handeln wird und hier nur mit zwei Flugbrandherkünften geprüft werden konnte, müssen die im Projekt als resistent eingestuften Genotypen mit weiteren Pathotypen erneut geprüft werden.Growing of resistant cultivars is the most effective and ecological way to prevent losses due to the loose smut, a disease prevalent in farming without seed treatments. In the present paper, the resistance level to loose smut in some of the European oat cultivars and genebank accessions is described.
For the inoculation of seed a vacuum-based method was used. The inoculum consisted of two loose-smut collections with different virulences. In all resistance screenings, inoculation was done at 800 mbar vacuum pressure and with an aqueous spore suspension of 1g/litre. Resistance evaluations were started with a glasshouse experiment with 216 genebank A. sativa accessions and 40 oat breeding lines or differentials, followed by the nursery experiment at two locations examining 100 cultivars and lines, respectively, and were completed with a glasshouse experiment with 60 oat lines.
The resistance screening at two locations and the two glasshouse screenings revealed at least 4 modern, 16 older cultivars and 9 genebank accessions with very high levels of resistance. A highly significant correlation coefficient between glasshouse and nursery examination was found, whereby the glasshouse conditions were favourable for testing under a high disease pressure. Because of the low virulences of the smut mixture used in these first experiments the putative resistant cultivars should be tested with additionally pathotypes of the fungus
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