1,720,981 research outputs found
Dynamique des communautés biologiques dans un contexte de restauration par injection sédimentaire et érosion maitrisée : cas du Vieux Rhin, France
No full textThe Rhine River has undergone major engineering works that led to severe alterations which helped to alter the biodiversity of the entire floodplain. Restoration actions have been initiated to give it back a part of its natural hydro morphological functioning. The thesis consisted in evaluating the effects of these restorations and in highlighting the mechanisms and processes involved in biocoenosis changes of the restored environments. The results also showed that the post-restoration biological community is not only defined by post-restoration physical changes but also by the discrete influence of external determinants of restoration such as biological invasions or the internal dynamics of the river. The transitional aspect of the benefits incurred has been identified as the main limit of the gravel augmentation, while the implementation of transverse artificial groynes in the controlled bank erosion has proved to be factors of sustainability of the ecological effects.Le Rhin a subi d’importantes modifications qui ont altéré la biodiversité de l’ensemble de la plaine alluviale. Des actions de restauration ont été initiées pour lui redonner une part de son fonctionnement hydromorphologique naturel. Le travail de thèse a consisté à évaluer les effets de ces restaurations et à mettre en évidence les processus mis en jeu dans les changements de la biocénose des milieux restaurés. Les résultats ont démontré que les communautés biologiques sont non seulement gouvernées par les modifications physiques post-restauration mais aussi par l’influence discrète de déterminants externes à la restauration tels que les invasions biologiques ou la dynamique interne du fleuve. L’aspect transitoire des bénéfices obtenus a été souligné comme la principale limite de l’injection sédimentaire alors que les épis transversaux artificiels mis en place dans le cadre d’un essai d’érosion maitrisée se sont révélés être les facteurs de durabilité des effets écologiques
Dynamics of biological communities in a context of restoration by gravel augmentation and controlled erosion : the case of the Old Rhine River, France
No full textLe Rhin a subi d’importantes modifications qui ont altéré la biodiversité de l’ensemble de la plaine alluviale. Des actions de restauration ont été initiées pour lui redonner une part de son fonctionnement hydromorphologique naturel. Le travail de thèse a consisté à évaluer les effets de ces restaurations et à mettre en évidence les processus mis en jeu dans les changements de la biocénose des milieux restaurés. Les résultats ont démontré que les communautés biologiques sont non seulement gouvernées par les modifications physiques post-restauration mais aussi par l’influence discrète de déterminants externes à la restauration tels que les invasions biologiques ou la dynamique interne du fleuve. L’aspect transitoire des bénéfices obtenus a été souligné comme la principale limite de l’injection sédimentaire alors que les épis transversaux artificiels mis en place dans le cadre d’un essai d’érosion maitrisée se sont révélés être les facteurs de durabilité des effets écologiques.The Rhine River has undergone major engineering works that led to severe alterations which helped to alter the biodiversity of the entire floodplain. Restoration actions have been initiated to give it back a part of its natural hydro morphological functioning. The thesis consisted in evaluating the effects of these restorations and in highlighting the mechanisms and processes involved in biocoenosis changes of the restored environments. The results also showed that the post-restoration biological community is not only defined by post-restoration physical changes but also by the discrete influence of external determinants of restoration such as biological invasions or the internal dynamics of the river. The transitional aspect of the benefits incurred has been identified as the main limit of the gravel augmentation, while the implementation of transverse artificial groynes in the controlled bank erosion has proved to be factors of sustainability of the ecological effects
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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