1,720,987 research outputs found
Groupe Vl/b : Géologie. Contribution à l'étude paléobotanique du Dévonien inférieur de Belgique : les genres nouveaux Ensivalia et Faironella par Philippe Gerrienne
No full textStreel Maurice, Lambinon Jacques, Delmer André. Groupe Vl/b : Géologie. Contribution à l'étude paléobotanique du Dévonien inférieur de Belgique : les genres nouveaux Ensivalia et Faironella par Philippe Gerrienne. In: Bulletin de la Classe des sciences, tome 5, n°7-12, 1994. pp. 467-469
Groupe Vl/b : Géologie. Contribution à l'étude paléobotanique du Dévonien inférieur de Belgique : les genres nouveaux Ensivalia et Faironella par Philippe Gerrienne
No full textStreel Maurice, Lambinon Jacques, Delmer André. Groupe Vl/b : Géologie. Contribution à l'étude paléobotanique du Dévonien inférieur de Belgique : les genres nouveaux Ensivalia et Faironella par Philippe Gerrienne. In: Bulletin de la Classe des sciences, tome 5, n°7-12, 1994. pp. 467-469
The Jurassic flora of Sardinia
Get PDFThe most important Middle Jurassic flora of Italy comes from several localities of central-eastern Sardinia. The plant fossils belong to three important collections, collected from the Genna Selole Formation and stored at the museum “D. Lovisato” of the Cagliari University (collection A) and at the Narodni Museum of Prague (collection B) as well as at the Natural History Museum of Venice (Scanu et al., 2015, 2016). The study of the first two collections shows that the Sardinian Jurassic flora includes at least 22 genera of horsetails (stems and strobili), ferns (Marattia; Phlebopteris, Coniopteris, Dicksonia, Eboracia, Hausmannia, Todites, Cladophlebis), seed ferns (?Ptilozamites, Sagenopteris), cycadophytes (Cycadeospermum, Nilssonia, Pterophyllum, Ptilophyllum, Williamsonia, Weltrichia, Taeniopteris), Czekanowskiales (Czekanowskia), conifers (Geinitiza, Brachyphyllum, Elatocladus) and seeds (Carpolithes). Lycophytes and ginkgophytes are lacking in the flora. This study increases the diversity of the Italian Jurassic floras to 49 genera in total. A comparison with other Middle Jurassic floras in Europe evidenced an affinity with the Middle Jurassic flora of Yorkshire (England), while the geographically nearer Lower Jurassic flora of Rotzo (northern Italy) shows remarkable differences in composition. These differences may be related to different ecological conditions and taphonomic selection (Barbacka et al., 2014). Comparison to the Yorkshire flora (the most diverse European Jurassic flora) shows that 19 genera are preserved in both floras, including ferns (Cladophlebis, Coniopteris, Dicksonia, Eboracia, Marattia, Hausmannia, Phlebopteris, and Todites), seed ferns (Sagenopteris), cycadophytes (Nilssonia, Pterophyllum, Ptilophyllum, Weltrichia, Williamsonia), conifers (Brachyphyllum, Elatocladus, Geinitzia), Czekanowskiales (Czekanowskia) and Carpolithes seeds. Leaves of Ptilophyllum pectinoides together with its female reproductive organ Williamsonia hildae and its male reproductive organ Weltrichia whitbiensis are present in both floras. Given that the Sardinian flora is composed of 22 genera only, the similarity between the two floras is striking. Collection B of the Lovisato Collection, stored at the Narodni Museum, is under study but preliminary results give important insights in the original composition of the Lovisato collection and in the plant diversity of this Middle Jurassic flora. The collection stores type material described by Krasser and completes the collection A stored in Cagliari. While cycadophytes are the dominant group in Collection A, they are rare in Collection B. On the other hand, sphenophytes and conifers that are rare with a low diversity in Collection A, but are among the most important groups (both in diversity and abundance) in Collection B. Moreover, Collection B also contains the crustacean Estheria sp., coming from the same stratigraphic level as the plant remains
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
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