1,720,965 research outputs found
La coupe de l'oued Ahmadi (Dahar, sud tunisien) : son intérêt pour la compréhension de l'évolution climatique au Pléistocène moyen
No full textFour sedimentary sequences are seen in the Middle Pleistocene terrace of Wadi Ahmadi. They may indicate four climatic oscillations while climate remains arid for the most part. An occasional changing of direction in the general Quaternary trend to aridification is indicated by the genesis of a calcrust after a gypscrust.La coupe de la terrasse du Pléistocène moyen de l'oued Ahmadi est organisée en quatre séquences sédimentaires qui pourraient traduire l'existence de quatre oscillations climatiques dans un climat restant aride dans l'ensemble. La genèse d'une croûte calcaire postérieurement à celle d'une croûte gypseuse indique un renversement épisodique de la tendance générale à l'aridification du climat pendant le Quaternaire.Ballais Jean-Louis, Ben Ouezdou H., Ghanmi M., Regaya K. La coupe de l'oued Ahmadi (Dahar, sud tunisien) : son intérêt pour la compréhension de l'évolution climatique au Pléistocène moyen. In: Méditerranée, troisième série, tome 64, 2-1988. Évolution des paysages tunisiens au cours du Quaternaire, sous la direction de J.-L Ballais et J. Vaudour. pp. 52-60
Premiers résultats du programme d'étude de l'Holocène de Tunisie
No full textFirst studies have established that one holocene terrace and one historic terrace have been accumulated. Fills of natural or anthropic dams also exist. Confirmation has been brought about the existence of pre-Capsian blown sands, lower to middle Holocene gypcretes and two post-Versilian marine transgressions.Les premières recherches ont établi l'importance de la dynamique fluviatile qui a accumulé une terrasse holocène s. s. et une terrasse historique, sans compter les accumulations à l'amont de barrages naturels ou artificiels. Elles ont confirmé l'existence de dépôts éoliens pré-capsiens, de croûtes gypseuses de l'Holocène inférieur-moyen et de deux remontées relatives du niveau marin depuis le Versilien.Ballais Jean-Louis, Bourgou M., Karray R., Lautridou J.P., Levant M., Oueslati Ameur, Ben Ouezdou H., Bou Hafa T., Gragueb Abderrazak. Premiers résultats du programme d'étude de l'Holocène de Tunisie. In: Méditerranée, troisième série, tome 64, 2-1988. Évolution des paysages tunisiens au cours du Quaternaire, sous la direction de J.-L Ballais et J. Vaudour. pp. 64-67
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
Nouvelles données à propos du Quaternaire et de la tectonique récente dans la chaîne de Metlaoui (sud-ouest de la Tunisie)
No full textFive quaternary levels, dated from middle Pleistocene to the historic period, are identified on the south piedmont of the Metlaoui range. After the post-villafranchian compressional phase, an extensive tectonic affects the quaternary layers in the middle and the late upper Pleistocene.Cinq niveaux quaternaires, datant du Pléistocène moyen à la période historique, sont identifiés sur le piémont méridional de la chaîne de Metlaoui. Postérieurement à la phase de compression post-villafranchienne, une tectonique distensive affecte les dépôts quaternaires au Pléistocène moyen et à la fin du Pléistocène supérieur.Ben Ouezdou H., Zargouni F. Nouvelles données à propos du Quaternaire et de la tectonique récente dans la chaîne de Metlaoui (sud-ouest de la Tunisie). In: Méditerranée, troisième série, tome 64, 2-1988. Évolution des paysages tunisiens au cours du Quaternaire, sous la direction de J.-L Ballais et J. Vaudour. pp. 22-26
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