1,720,962 research outputs found
Coelorinchus stellaris n. sp. (macrourid fish) of the late Oligocene of Aquitaine and its palaeobiogeographic interest [Coelorinchus stellaris n. sp. (poisson macrouridé) de l'oligocéne terminal d'aquitaine et son intérêt paléobiogéographique]
No full textSince the late Oligocene, a fossil Coelorinchus species, C. stellaris, existed beside the Recent C. coelorhinus. In the Atlantic realm, C. stellaris appeared in the Palaeocanyon of Saubrigues (Aquitaine) in the Late Oligocene, but the species entered in the Mediterranean in the Late Pliocene (Gelasian) only, may be because of modified climatic conditions. In the Mediterranean realm, C. stellaris is known from the Gelasian and Early (Santernian, Emilian) - and Middle Pleistocene. Apparently, the species became extinct before the end of the Pleistocene
Concours annuel de 1984. Groupe IV/a. Rapports sur le mémoire de M. Dirk Nolf
No full textPoll Max, Ubaghs Georges, Stockmans François. Concours annuel de 1984. Groupe IV/a. Rapports sur le mémoire de M. Dirk Nolf. In: Bulletin de la Classe des sciences, tome 70, 1984. pp. 559-564
Fish otoliths from the Lutetian of the Aquitaine Basin (SW France), a breakthrough in the knowledge of the European Eocene ichthyofauna
No full textThe fossil otolith assemblages of the Aquitaine Basin (SW France) have been extensively studied for more than 30 years
and are among the best documented worldwide. However, Lutetian otoliths are less well known than those from the lower
and upper Eocene. A new collection of>11,000 otoliths from the Lutetian Miretrain Marl Formation from five different
localities in Peyrehorade and the Donzacq Marl Formation at Saint-Geours-d’Auribat is analysed here. The oldest site at
Saint-Geours-d’Auribat is dated at 47.40 Ma, and the youngest at the ‘la Teoulere’ escarpment at 44.05 Ma. At least 89
otolith-based taxa are recorded, of which 69 are identified at species level. Twenty of these are introduced here by Lin,
Nolf and Girone as new species: ‘Elops’miiformissp. nov., ‘Ophichthus’mignolosp. nov.,Saurida trompensissp. nov.,
‘Scopelarchus’gnoccosp. nov., ‘Evermannella’razzasp. nov.,Neoscopelus navicularissp. nov., ‘Trachyrincus’iocosus
sp. nov.,Nezumia teoulerensissp. nov., ‘Neobythites’auribatianussp. nov., ‘Neobythites’bozzolosp. nov., ‘Neobythites’
leonardi sp. nov., Melamphaes acanthifersp. nov., Zenion mattaccinosp. nov., Zenion vetustussp. nov., ‘Perca’
lactarioides sp. nov., ‘Perca’ meiformissp. nov., ‘Liopropoma’ sculpta sp. nov., ‘Branchiostegus’ brevis sp. nov.,
‘Haemulon’strascinatesp. nov. andCepola rostislavisp. nov. The occurrence ofN. teoulerensis sp. nov. is particularly
important because it documents the earliest macrourid fossil record from the Northern Hemisphere. The assemblages all
indicate a deep neritic environment, similar to that of several of the Ypresian and Priabonian deposits of the Aquitaine
Basin. The difference in taxonomic composition between the Lutetian assemblages of Aquitaine and those of the
neighbouring Anglo-Belgo-Parisian basin and Osteroden (Germany) is mainly environmentally based. The new material
contains many nominal upper and/or lower Eocene species whose stratigraphical distribution is thus extended to the
Lutetian, suggesting that the important faunal renewal in the Eocene of the Aquitaine Basin is more gradual than
previously believe
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
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