1,721,371 research outputs found
Apartheid : 1986, l’année des sanctions
No full textHansen Maria. Apartheid : 1986, l’année des sanctions. In: Recherches Internationales, n°24, 1987. pp. 71-77
Le 8e sommet des Non-alignés
No full textHansen Maria. Le 8e sommet des Non-alignés. In: Recherches Internationales, n°22, 1986. pp. 96-99
Measuring and Comparing the Diffusion Rate of Fluorescent-Lipophilic-Neurotracing Probes in Murine-Peripheral-Nerve Preparations
No full textLipophilic-fluorescent dyes are used as probes to study the neural pathways that wire the brain. Since these dyes are able to define neuroanatomic connections through all stages of normal and mutant development, they are currently the most comprehensive method for neurotracing. In order to efficiently trace such circuitry, it is necessary to use a diffusion-matched set of spectrally distinct dyes. The fluorescent dye molecule is composed of a fluorescent head group and two hydrocarbon chains. This thesis addresses how the molecular structure of a lipophilic-fluorescent dye affects the diffusion rate by considering both the configuration of the fluorescent head group and the hydrocarbon chain length. Since the diffusion rate may also depend on the concentration of a dye, this parameter was investigated as well. Three hypotheses were addressed by measuring these parameter independently. Each dye was measured and compared using the Diffusion Distance vs. Incubation Period technique. FRAP was also used as anotherapproach for measuring the dyes. Hypothesis I: The structure of the fluorescent head group affects the diffusion coefficient. The investigation of this hypothesis demonstrated that the fluorescent head group can affect the diffusion rate. Hypothesis II: The diffusion parameters are dependent on the applied concentration. From this investigation, the results did not support the hypothesis. Hypothesis III: The diffusion coefficient is dependent on the lengths of the hydrocarbon chains. The results from these measurements demonstrate faster diffusion rates with increasing chain length
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
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