1,720,957 research outputs found
Apport de la géostatistique à la prédiction de la diversité avienne dans le Parc National de Gouraya (Algérie)
No full textContribution of geostatistics to predict bird diversity in Gouraya National Park (Algeria).
The present study emphasizes the contribution of geostatistics techniques in ornithology. We used kriging interpolation to predict avian diversity in the Gouraya National Park. The punctual index abundance method was used to census birds based on a grid network (250 m x 250 m). An exploratory analysis with the variogram has characterized the spatial variability of studied variable. The ordinary kriging was used to realize diversity map prediction which shows the spatial behaviour trend of this variable. The standard deviation map has given an assessment of the quality of the estimate. The diversity map prediction is thus an important tool for decision support directly applicable to the management and conservation of birds in Gouraya National Park.La présente étude a fait ressortir l’apport des techniques géostatistiques en ornithologie. Pour ce faire, nous avons utilisé l’interpolation par krigeage pour prédire la diversité avienne sur l’ensemble du territoire du parc national de Gouraya (Algérie). La méthode des indices ponctuels d’abondance a été utilisée pour le dénombrement des oiseaux sur la base d’un réseau à maille carrée de 250 m × 250 m. Une analyse exploratoire par le biais du variogramme a permis la modélisation du comportement spatial de la variable étudiée. Le krigeage ordinaire a été retenu pour la réalisation de la carte de prédiction de la diversité avienne. Cette carte fait apparaître les zones à forte diversité avienne. La carte des écarts-types a donné une appréciation de la qualité de l’estimation. La carte de prédiction de la diversité avienne constitue ainsi un outil important d’aide à la décision directement applicable en matière de gestion et de conservation de l’avifaune du parc national de Gouraya.Boubaker Zoubir, Bellatreche Mohamed, Moussouni Abdenour. Apport de la géostatistique à la prédiction de la diversité avienne dans le Parc National de Gouraya (Algérie). In: Revue d'Écologie (La Terre et La Vie), tome 66, n°3, 2011. pp. 215-229
A case of melanism in the horseshoe whip snake Hemorrhois hippocrepis from Algeria
No full textThe dorsal colouration of H. hippocrepis is quite variable across its geographic range, where its ground colour can have diverse hues. A form of partial melanism, where the overall dorsal colour is blackish except for small light dots that surround the elements of the pattern, is fairly common in this species, especially in some of its eastern populations. This dark morph appears to be purely ontogenetic, as it is exclusively present in adults, whereas juveniles are typically light coloured. Partially or totally melanistic juveniles are quite rare in H. hippocrepis, as is the case in juveniles and adults in congeneric species. Here, we describe for the first time a melanistic juvenile H. hippocrepis from its African geographic range
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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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