1,720,997 research outputs found
Tracking thermal histories through the detrital record using rutile U-Pb-He double-dating
No full textInvestigation of source-to-sink relationships using the detrital record is frequently reliant on zircon and thus biased toward high-temperature magmatic processes. In contrast, rutile, which grows or recrystallizes under lower-temperature conditions, allows reconstruction of the metamorphic history of source terranes. Here, we present the first rutile double-dating analysis, integrating U-Pb geochronology and (U-Th)/He thermochronology on individual grains to refine provenance understanding. Results from heavy mineral−enriched Neogene siliciclastic sediments of the Murray Basin in southeast Australia fingerprint an exotic central Australian source, implying long-distance multicycle sediment dispersal via intermediate sedimentary basins. Source-to-sink relationships support the billion-year influence of radiating pulses of sediment dispersal across the Australian continent from its denuding core
Grain selection for representative detrital zircon age populations
No full texthttp://dx.doi.org/10.13039/501100001797 Curtin University of Technologyhttp://dx.doi.org/10.13039/501100009108 Minerals Research Institute of Western Australi
Australian continental‐scale heavy mineral patterns track climate, weathering and erosion
No full textABSTRACT The heavy mineral cargo of sediment is influenced by a complex and variable overprint of climate and environmental processes acting on weathered crystalline basement sources. Here, a continental‐scale heavy mineral compositional dataset of 1315 surface sediment samples, analysed via automated mineralogy, from across Australia is utilized to differentiate between primary source signals and secondary, weathering‐related and transport‐related sediment modification. The results show that heavy mineral patterns not only retain provenance information from the underlying crystalline basement but also have imprinted apparent relationships to measurements of climatic and environmental conditions. Sediment properties change from source to sink and indicate that sediment storage duration considerably influences mineral composition, progressively overprinting primary source information over hundreds of thousands of years. These findings offer a quantitative means to assess and spatially evaluate palaeo‐weathering intensity within ancient landscapes, estimate information loss, and enhance interpretation of the detrital record.Minerals Research Institute of Western Australia https://doi.org/10.13039/50110000910
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
1977 Mimosa Dedicated to JSU History Department 1
No full textThe 1976 Mimosa was dedicated the Jacksonville State University History Department. History department faculty included Col. Worden Weaver, Dr. Peter Robinson (department head), Dr. David Childress, Dr. Mary Martha Thomas, Dr. Patricia Wingo, Dr. Philip Koerper, Dr. Ralph Brannen, Rayford B. Taylor, Dr. Ronald J. Caldwell, John W. Barham, Milo Magaw, Dr. Daniel W. Hollis, Dr. Calvin Wingo.https://digitalcommons.jsu.edu/lib_ac_histimg_1970/1439/thumbnail.jp
1976 Mimosa Dedicated to JSU History Department 1
No full textThe 1976 Mimosa was dedicated the Jacksonville State University History Department. History department faculty included Col. Worden Weaver, Dr. Peter Robinson (department head), Dr. David Childress, Dr. Mary Martha Thomas, Dr. Patricia Wingo, Dr. Philip Koerper, Dr. Ralph Brannen, Rayford B. Taylor, Dr. Ronald J. Caldwell, John W. Barham, Milo Magaw, Dr. Daniel W. Hollis, Dr. Calvin Wingo.https://digitalcommons.jsu.edu/lib_ac_histimg_1970/1438/thumbnail.jp
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
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