1,720,997 research outputs found
Preliminary results on terrestrial organic matter preserved in the SMS well: implications for thermal and burial history reconstruction.
No full textUnravelling the sedimentary and tectonic burial history of the Laga Basin (Central Apennines, Italy): constraints from combined organic matter and clay mineral data.
No full textSedimentary vs. tectonic burial of the Laga Basin (Central Apennines, Italy): constraints from combined organic matter and clay mineral data
No full textUnravelling the sedimentary and tectonic burial history of the Laga Basin (Central Apennines, Italy): constraints from combined organic matter and clay mineral data
No full textPreliminary results on lignin-rich organic matter dispersed in sediments of AND-2A well (ANDRILL’S SMS project): paleo-thermal and paleo-climatic implications
No full textOrganic matter optical analysis and clay mineralogy to unravel the tectonic/sedimentary burial in the Laga Basin (Italy)
No full textVitrinite reflectance data and clay mineral assemblages were used to investigate levels of diagenesis from the Messinian Laga Basin (Central Apennines) developed at the footwall of the Sibillini Mts. and the Gran Sasso Massif. Data derive from stratigraphic units forming the siliciclastic basin fill up to Middle Messinian gypsum-arenites and its pre-orogenic substratum. Highest Ro% values and percentages of illite layers in I/S are found in the basin depocentre and at the footwall of the carbonate thrust sheets. Lower Ro% values and percentage of illite layers in I/S characterize less subsided sectors. I/S records the maximum paleo-temperature the Laga Fm. experienced related to its burial history whereas KI data suggest higher temperatures related to detrital K-micas inherited from the uplift of the Alpine-Apennines chain. A calculation of paleo-temperatures from selected data of organic and inorganic parameters is proposed and compared with recent stratigraphic and structural data. This allowed proposing that the Laga basin fill never experienced temperatures > 100-110°C, due to variable sedimentary loading, while localised anomalous heating is due to the effect of the tectonic emplacement and subsequent local erosion of the Sibillini and Gran Sasso thrust sheets
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
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