1,721,034 research outputs found
Carbonate clumped isotope evidence for latitudinal seawater temperature gradients and the oxygen isotope composition of Early Cretaceous seas
Full text linkLower Cretaceous stratigraphy and foraminifera from N. E. England: application to sequence stratigraphy
No full textHart Malcolm B., Price Gregory D., Smart Christopher W. Lower Cretaceous stratigraphy and foraminifera from N. E. England: application to sequence stratigraphy. In: Documents des Laboratoires de Géologie, Lyon, n°164, 2008. Mid-Mesozoic life and environments. Cognac (France), June 24th-28th 2008. p. 50
Southern high-latitude warmth during the Jurassic-Cretaceous:New evidence from clumped isotope thermometry
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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
Multi-proxy record of orbital-scale changes in climate and sedimentation during the Weissert Event in the Valanginian Bersek Marl Formation (Gerecse Mts., Hungary)
Full text linkAppropriate 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
Clumped isotope measurements of Early Cretaceous belemnites across latitudes
No full textHere, we present the results of the clumped isotope measurements on 20 Early Cretaceous (Valanginian) belemnites. Further, we provide the results of the equilibrated gases and the carbonate reference material that were measured along with the samples. Carbonate digestion at 90 °C and subsequent CO2 purification was performed on an automated line connected to a ThermoFisher MAT 253 isotope ratio mass spectrometer. The data is projected to the Carbon Dioxide Equilibrium Scale (CDES) and presented without an acid fractionation factor applied. Further details on the sample material, sample preparation method, and mass spectrometry procedures can be found in the associated files and the linked article: Price et al. (2020)
Clumped isotope measurements of Early Cretaceous belemnites across latitudes, link to analysis sheet
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