1,721,637 research outputs found
New South Wales [cartographic material] /
No full textMap of N.S.W. showing counties and notes on the topography. Relief shown by hachures and spot heights.; Plate from: A series of maps, modern and ancient under the superintendence of the Society for the Diffusion of Useful Knowledge. London : Baldwin & Cradock, [1829-35].; Phillips, 753; Tooley, 1542; Rex Nan Kivell Collection Map NK 11346. Inset: Sydney from the New South Wales almanack
Trace element and strontium and barium isotopic variability of CM chondrites Aguas Zarcas and NWA 11346: Insights from stepwise acid leaching
No full textCarbonaceous chondrite meteorites represent unmelted but variably metamorphosed aggregates of a diverse range of the earliest solids of the solar system, including matrix, chondrules, calcium-aluminium inclusions and exotic presolar grains. As such, they preserve a record of the inventory of materials that were first brought together in the evolving protoplanetary disk then were subjected to processes such as thermal and aqueous alteration on their parent body. To gain further insights into the elemental and isotopic variability of primitive meteorites and their components, stepwise acid leaching experiments were carried out on pre-rain collected 2019 fall CM2 Aguas Zarcas and anomalous-CM find NWA 11346 carbonaceous chondrites. Pre-rain collected fall samples of primitive meteorites in particular are exceptionally rare; thus the Aguas Zarcas sample provides an excellent opportunity to study materials essentially unaffected by any terrestrial alteration imprint. Acid leachates and bulk samples were analysed for trace elements (including the rare earth elements) via ICP-MS, while Sr and Ba isotopes were measured using TIMS. Trace element variations reveal diverse compositions for bulk samples and their leachates, interpreted to reflect differing parent body histories and the contrasting impacts of terrestrial contamination. Sr isotopic analysis of leach fractions yields variable (primordial) µ84Sr values compared to the NBS987 terrestrial standard, ranging from +326 to -2089 ppm in Aguas Zarcas and from +46 to -559 ppm in NWA 11346. Both Aguas Zarcas and NWA 11346 show the strongest depletions of µ84Sr in the strongest acid leachates; however, the variability of µ84Sr among Aguas Zarcas leachates differs from the same leaching steps for NWA 11346. Bulk meteorite Sr isotopic analysis of Aguas Zarcas and NWA 11346 yields values indistinguishable from the standard. For Ba isotopes, bulk Aguas Zarcas shows resolvable depletions in 130Ba, 135Ba, 137Ba and 138Ba, while NWA 11346 shows similar depletions in 135Ba, 137Ba and 138Ba. Early Aguas Zarcas leachates are characterised by positive anomalies of 130Ba, 132Ba, 135Ba, 137Ba and 138Ba (up to +2295 ppm µ130Ba). In contrast, final leachates of both samples show strong depletions for the same nuclides, the largest of which are -60,000 ppm µ130Ba in Aguas Zarcas and -4370 ppm µ130Ba in NWA 11346. The Sr and Ba isotopic variability between samples and their respective leachates suggests input from multiple nucleosynthetic sources, highlighting the diversity among CM chondrites and the heterogenous distribution of nuclides in the protoplanetary disk.</p
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
AMČR - dokument C-200913914A-DT-11346
No full textStav: 3Označení: DSC04303Popis: Snímek z terénního výzkumu
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