1,720,960 research outputs found
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
MASTCAM SPECTRAL DIVERSITY OF ROCKS THROUGH CURIOSITY’S EXPLORATION OF GLEN TORRIDON
No full textNASA\u27s Curiosity rover is exploring a 5-km tall sedimentary mound in the center of Gale crater, known as Mt. Sharp, hypothesized to have formed via primarily lacustrine and aeolian processes. Orbital data of lower Mt. Sharp indicate phyllosilicate- and sulfate- bearing strata (Bibring et al., 2006). The phyllosilicate -sulfate transition has been observed in several locations on Mars, indicating a global environmental change around the Noachian-Hesperian transition (around 3.7 Ga) from a more wet climate that accommodates clay mineral formation to a drier, more acidic environment that allows sulfates to precipitate (Milliken et al., 2010; Chevrier et al., 2007). The Mast Camera (Mastcam) is an imaging instrument on Curiosity that can collect visible to near infrared (VNIR) multispectral observations, which provide broad mineralogic interpretations and context for other instruments. Our goal is to compare previously established Mastcam multispectral classes of rocks (Rice et al., 2022) to newer spectra from the phyllosilicate- rich region, known as Glen Torridon, and the overlying sulfate- bearing unit, thus enhancing our understanding of ancient geologic processes and habitability of the surface of Mars. Initial results reveal variation in three of the nine rock classes, potentially influenced by nontronite and/or other phyllosilicates, and Mg- and Ca- sulfates. Using WWU\u27s goniometer, these hypothesized constituents will be tested by collecting VNIR spectra on multiple mineral mixtures
A Mastcam Multispectral Investigation of Rock Variability in Gale Crater, Mars: Implications for Alteration in the Clay-Sulfate Transition of Mount Sharp
Get PDFThe Mars Science Laboratory Curiosity rover has explored over 650 m of strata since landing in 2012. After leaving Vera Rubin Ridge (VRR), the rover traversed though the phyllosilicate-rich region, Glen Torridon, and the Mg-sulfate-bearing strata that lies above it, with excursions onto the Greenheugh Pediment and Amapari Marker Band. These unique stratigraphic units were investigated using Curiosity\u27s instrument suite which includes the Mast Camera (Mastcam) pair of multispectral imagers. Mastcam’s narrowband filters are sensitive to iron-bearing phases and some hydrated minerals. We used Mastcam spectra, in combination with chemical data from Curiosity’s CheMin, APXS and ChemCam instruments, to assess the variability of rock spectra and interpret the mineralogy, depositional origin, and diagenesis in the clay-sulfate transition and surrounding regions. To constrain the Mg-sulfate detection capabilities of Mastcam and aid in the analyses of multispectral data, we conducted a laboratory investigation with different mixtures of phyllosilicates, hydrated Mg-sulfate, and basalt. We identify four new classes of rock spectra since leaving VRR. The localities and cross-instrument comparisons with these Mastcam spectra suggest that: (1) two of the new classes are inherent to dusty and pyroxene-rich surfaces on the Amapari Marker Band; (2) one new class is associated with the relatively young, basaltic, Greenheugh Pediment; and (3) one new class indicates areas subjected to intense aqueous alteration with an amorphous Fe-sulfate component, primarily in the clay-sulfate transition region. Our laboratory investigation shows the ease at which hydrated Mg-sulfates can be masked by other materials, requiring ≥ 90 wt. % of hydrated Mg-sulfate to exhibit a hydration signature in Mastcam spectra. Thus, we conclude that it would be challenging for Mastcam to detect Mg-sulfate in an intimate mixture. However, we can use these results to constrain the abundance of hydrated Mg-sulfates along Curiosity\u27s future traverse. Together these results imply significant compositional changes along the traverse since leaving VRR, and they support the hypothesis of wet-dry cycles in the clay-sulfate transition. The new set of Mastcam spectral classes will provide a baseline for Curiosity\u27s further exploration of Mount Sharp, where hydrated sulfates, minor phyllosilicates, and other hydrous mineral signatures have been identified from orbit
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
