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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
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
Misschien wil de minister mee op expeditie om te zien dat alfa’s, bèta’s en gamma’s niet zonder elkaar kunnen
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Marine lakes of Indonesia
Full text linkThe objective of this thesis was to obtain insight into the processes that play a role in biodiversity patterns of tropical marine species by using marine lakes as a model. Marine lakes are landlocked water bodies that maintain a marine character through narrow submarine connections to the sea. Two regions in Indonesia were studied: Berau (East Kalimantan) and Raja Ampat (West Papua). The following questions were addressed: 1. What are the different types of marine lakes in Indonesia? 2. Are the species assemblages in marine lakes distinct from those in the adjacent coastal environments? 3. To what extent are the populations in the lakes isolated? 4. Can marine lakes in Indonesia be considered natural laboratories of evolution? There is a large diversity in types of marine lakes and many more remain to be documented in Indonesia. The spatial variation in sponge species composition in marine lakes, coastal mangroves and coral reefs show that marine lakes contain three groups of sponge species: (a) widespread species known from various locations in Indo-Pacific reefs, (b) lake species that only occur in lake systems, (c) endemic species restricted to a single lake. The patterns of genetic variation found in the marine lake populations are generally consistent with populations in isolated environments. The lakes appear to be both cradles and refuges of diversityLEI Universiteit LeidenDe Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO-ALW # 817.01.008)
Naturalis Biodiversity Center
National Geographic/Waitt Grant
De Beukelaar – van der Hucht Stichting
Koninklijke Nederlandse Akademie Wetenschappen
INNO/Wereld Natuur Fonds subsidie
Conservation International & David and Lucile Packard Foundation
Alida M. Buidendijk Fonds
Jan Joost Ter Pelkwijk Fonds
Leids Universiteits FondsEvolutiebiologi
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
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