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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
Ein systemorientierter Ansatz zur Quantifizierung von Treibhausgasemissionen und weiteren Kennzahlen von Milchproduktionssystemen unterschiedlicher Milchleistung und Rasse
No full textThe effect of increasing milk yield per cow on greenhouse gas (GHG) emissions and on other side effects was quantified. System modelling and life cycle assessment were conducted. A special focus was given to the close interlink of milk and beef production and to uncertainties in GHG modelling. Greenhouse gas emissions and land use impact of increasing milk yield/cow differs, depending on the amount beef that has to be compensated for. System approaches that go beyond the boundary of the dairy farm gate are necessary to avoid shift of GHG emissions between production systems or countries.Die Auswirkungen einer Milchleistungssteigerung in der Milchviehhaltung auf Treibhausgas(THG)-Emissionen und weitere Kennzahlen wurden mit Hilfe von Systemmodellierungen und Lebenszyklusanalysen quantifiziert. Ein besonderes Augenmerk wurde auf die Verknüpfung der Milch- und Rindfleischproduktion sowie auf die Unsicherheiten bei der Modellierung von THG-Emissionen gelegt. Die Umweltwirkungen (THG-Emissionen) und der Flächenbedarf bei einem Anstieg der Milchleistung sind von der Menge des zu kompensierenden Rindfleisches abhängig
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
Vollweidestrategie versus Hochleistungsstrategie-Ermittlung von Treibhausgasemissionen und ökonomischen Erfolgsgrößen am Beispiel Irischer und Deutscher Milchviehbetriebe
No full text
kobilanzierung der Rindfleischerzeugung verschiedener Produktionssysteme - dargestellt für Treibhausgase
No full textAppropriate 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
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