1,721,111 research outputs found
14 Southern Ocean Sea Surface Temperature records recalibrated to MARINE20 and tied to the AICC2012 Timescale, Southern Ocean Sea Surface Temperature Anomaly Stacks
No full textThis comprises supplementary data from "Expression of Millennial-Scale Antarctic Warming Events in the Southern Ocean." and represents 14 sediment records from the Southern Ocean, 30°S - 60°S. These records have had their age models recalibrated and tied to EDC dD on the AICC2012 timescale to facilitate comparison across basins, and in order to create SST stacks for the Atlantic-Indian, Pacific, and Southern Oceans
Relative abundance of diatom species, biogenic silica and Si/Al over last ~140 kyr, from the East Antarctic continental margin
No full textThis dataset contains relative abundance (%) of diatom species, and includes the Eucampia antarctica terminal/intercalary valve ratio (Eucampia index), biogenic silica and Si/Al values from core TAN1302-44, which was collected from the WEGA channel on the continental slope, offshore Adélie Land, East Antarctica. Diatoms were analysed at 10 cm, resolution within interval 350-5 cm-depth, while biogenic silica was analysed every 20 cm, and Si/Al (X-ray Flourescence scanning, XRF) comprises a 3-point average, from every 0.2 cm, of entire core. The data also includes four radiocarbon dates, calculated from 0 cm, 25 cm, 35 cm and 45 cm- depths; Shannon-Wiener biodiversity index based on all species identified, and principal component analysis based on species identified at >1.8% relative abundance (in at least two samples). The main purpose of this dataset compilation was to understand the distribution of species, and species assemblages. The interpretation of the data sets suggests changes in Antarctic sea ice and ocean circulation occured near the ice sheet, over the last glacial cycle. These changes are especially evident in the last glacial, and during the last deglacial (warming)
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
A new boron isotope-pH calibration for Orbulina universa, with implications for understanding and accounting for ‘vital effects’
No full textThis work was aided by NERC PhD studentships granted to MH and RG, and NERC grant NE/D00876X/2 awarded to GF. Voyage TAN1106 was funded by the New Zealand government through NIWA core funding, and Cariaco sampling was funded through NSF award 1258991.Boron isotope ratios, as measured in planktic foraminifera, can be a useful tracer of past ocean pH, and hence help to discern the concentration of CO2 in the ancient atmosphere. However, different species of planktic foraminifera demonstrate different patterns of boron isotope variation with ambient seawater pH. Therefore when applying the proxy to questions in the geological past, species-specific calibrations are preferable. Beyond the evolutionary history of a calibrated species, we must rely on our understanding of the causes of the observed “vital effects” in the modern ocean, and the applicability of that understanding to extinct species. Here we present a new open-ocean calibration of the planktic foraminifera Orbulina universa, measured via Multi-Collector Inductively Coupled Mass Spectrometry (MC-ICPMS). Unlike other symbiont-bearing foraminifera, O. universa record a δ11B (and hence pH) that is lower than its surrounding seawater, but with a pH-sensitivity roughly equal to that of aqueous borate ion. We discuss the significance of this for application of the boron isotope proxy in deep time, with recommendations for best practice and future research directions.Peer reviewe
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
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
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