1,725,417 research outputs found
Artedius notospilotus (OS 2995)
No full textCT reconstruction of OS 2995 Artedius notospilotus Girard, 1856. Specimen length: 116.19mm (SL)
Astronomische Nachrichten, nos 2995-3000
No full textR. R. Astronomische Nachrichten, nos 2995-3000. In: Bulletin astronomique, tome 7, 1890. pp. 443-448
Quantitative EPMA Compositional Mapping of NWA 2995: Characterization, and Petrologic Interpretation of Mafic Clasts
Full text linkWe present the first fully quantitative compositional maps of lunar meteorite NWA 2995 using electron microprobe stage mapping, and compare selected clast mineralogy and chemistry. NWA 2995 is a feldspathic fragmental breccia containing numerous highland fine grained lithologies, including anorthosite, norite, olivine basalt, subophitic basalt, gabbro, KREEP-like basalt, granulitic and glassy impact melts, coarse-grained mineral fragments, Fe-Ni metal, and glassy matrix [1]. Chips of NWA 2995, representing these diverse materials, were analyzed by INAA and fused-bead electron-probe microanalysis (EPMA); comparison of analytical data suggests grouping of lunar meteorites NWA 2995, 2996, 3190, 4503, 5151, and 5152. The mean composition of NWA 2995 corresponds to a 2:1 mixture of feldspathic and mare material, with approximately 5% KREEP component [2]. Clast mineral chemistry and petrologic interpretation of paired stone NWA 2996 has been reported by Mercer et al. [3], and Gross et al. [4]. This study combines advances in quantitative EPMA compositional mapping and data analysis, as applied to selected mafic clasts in a polished section of NWA 2995, to investigate the origin of mafic lithic components and to demonstrate a procedural framework for petrologic analysis
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
Open Access – Ein Vorschlag zur Klassifikation und Operationalisierung
No full textDer Begriff Open Access bezeichnet nicht nur eine bestimmte Art des wissenschaftlichen Publizierens – nämlich den leserseitig kostenlosen, freien Zugang zu Forschungsergebnissen in einem digitalen Format – sondern impliziert auch, dass dieser erstrebenswert ist. Zusammen mit der großen Vielfalt von Open-Access-Typen erschwert der normative Gehalt des Begriffs die Verständigung über wissenschaftliches Publizieren und freie Zugänglichkeit sowie die empirische Beforschung des Phänomens. Ziel des Beitrags ist es, ein nicht-normatives Verständnis von Open Access zu entwickeln, das sich für empirische Studien im Bereich der Bibliometrie und Wissenschaftsforschung eignet. Dies erfolgt in drei Schritten: Erstens werden die normativen Gehalte des Begriffs expliziert und von den deskriptiven Begriffsbestandteilen getrennt. Daran anschließend findet zweitens eine Durchsicht der Dimensionen statt, die der Unterscheidung verschiedener Typen von Open Access zugrundeliegen. Basierend darauf wird ein Klassifikationsschema entwickelt, das in den einzelnen Dimensionen vollständig ist und zu abgrenzungsstarken Open-Access-Klassen führt. Der empirische Nutzen einer solchen Klassifikation hängt nicht nur von der Stringenz der konzeptionellen Überlegungen ab, sondern auch von der Operationalisierbarkeit der Klassen. Daher wird drittens illustriert, welche offenen Datenquellen für einen Nachweis der verschiedenen Klassen genutzt werden können. Um den Nutzen von Klassifikation und Operationalisierung zu illustrieren, schließt der Beitrag mit einem Ausblick auf das Projekt OAUNI, mit dem Open-Access-Profile für sämtliche Universitäten Deutschland erstellt und Determinanten zur Erklärung von Unterschieden in den Profilen empirisch getestet werden sollen
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