1,721,271 research outputs found
Stenopelix valdensis H. v. Meyer, der kleine Dinosaurier des norddeutschen Wealden
No full textIn Bückeburg befindet sich noch das Original zuHermann v. Meyer’s Stenopelix valdensis. Hinterbeine, Becken und Schwanz sind als Hohlformen günstig erhalten. Neu konnte das Postpubis nachgewiesen werden, womit die bisher nur vermutete Zuordnung zu den Ornithischia sichergestellt wird.The holotype ofStenopelix valdensis H. v. Meyer 1859 is preserved at Bückeburg in the Ballerstedt collection (Gymnasium Adolfinum). The greater part of the skeleton is well preserved as a sandstone-mold. A postpubis of Ornithischian character, overlooked by earlier authors, is to be seen in a new latex-positive
Weitere Funde von Conodonten-Gruppen aus dem oberen Karbon des Sauerlandes
No full textEs liegen mehr als 50 Gruppenfunde von Conodonten vor, von denen 7 nach Feinpräparation im einzelnen untersucht worden sind. Die Apparate mitGnathodus integer Schmidt 1934 undGnathodus bilineatus (Roundy 1926) gleichen sich im allgemeinen Bau, und nur in den Einzelelementen weichen sie voneinander ab. Statistische Erfassung der Einbettungslagen führte zu dem Schluß, daß der Tierkörper weder ventral noch lateral ausgesprochen abgeplattet war. Die Anordnung der Elemente in den Apparaten zeigt, daß die seitherige bei den Einzelelementen vorgenommene Orientierung mit der Neigung der Zähnchen nach „hinten” nicht in jedem Falle der natürlichen Lage im Körper entsprach. Die Zähnchen sind bei den verschiedenen Elementen gegeneinander gerichtet. Von Gruppen mitTripodellus- undMetalonchodina-Elementen lagen einige Exemplare und von einer Gruppe (?) mit Idiognathodontidae g. et sp. indet. und großenLigonodina-Elementen nur ein Einzelfund vor.
In der Diskussion der systematischen Stellung der Conodonten stehen die gegensätzlichen Auffassungen beider Autoren nebeneinander.H. Schmidt vertritt die Fischtheorie,K. J. Müller stellte Gesichtspunkte zusammen, die gegen die Einordnung in einen bisher bekannten Stamm des Tierreiches sprechen
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
- …
