1,720,963 research outputs found
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
Clumped isotopes in planktonic foraminifera: application in a multiproxy North Atlantic study
Full text linkRobust experimental protocols for the clumped isotope analysis of foraminifera are established using the University of East Anglia’s Multi-Isotopologue-Ratio-Analyser (MIRA). Key advances include sample cleaning and preparation, development of a corrective algorithm to overcome a persistent sample size effect, and optimisation of standard measurements for projection of [delta]47 values onto the absolute reference frame.
A foraminifera clumped isotope temperature calibration is derived through measurement of 25 Atlantic core top samples: [delta]47=0.0314 (±0.0027)×106/T2+0.3171 (±0.0332)
The calibration shows good agreement with previous studies. However, measurement uncertainty remains too large for reliable temperature reconstructions.
In addition, a high-resolution, multiproxy study of North Atlantic core MD99-2251 is conducted, offering exceptional resolution through MIS 4 – 2. It shows highly variable surface temperatures with numerous cold excursions. Comparison with nearby benthic δ13C records has provided additional detail on the relationship between ice rafting and oceanic ventilation. The AMOC shows evidence of suppression following H10, H6 and H4.
The new ice rafting record has provided enhanced detail on specific Heinrich Stadial events, offering improved clarity on the timing and nature of H3 and H6 — as well as showing H5a, H7a, and H7b exhibit suppressed magnitude in comparison to other Heinrich events. The onset of cooling is shown to precede ice rafting, supporting the growing body of evidence that Greenland cooling acted as a driver of ice rafting, as opposed to being a symptom of it.
Finally, a new multispecies stable isotope record of core U1302 from the Labrador Sea is presented, offering improved resolution and timing restraints on the Termination II transition and MIS 5e Plateau. Short lived isotopic excursions during Termination II reveal a ‘step-like’ transition. Comparison of the isotopic signatures of epipelagic and mesopelagic foraminifera species support earlier findings of a highly stratified water mass during the last interglacial
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
Accompanying datasets to Umbo et al., (submitted), Speleothem evidence for late Micocene extreme Arctic amplification
No full text<p>Clumped and stable isotope, trace element, and fluid inclusion measurements from late Miocene (8.68 ± 0.09 Ma) speleothem samples collected from Taba Bastaakh in northern Siberia (N72.37°, E126.48°) including clumped isotope measurements, fluid inclusions, and high resolution trace element and stable isotope data.</p>
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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