1,720,961 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
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
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
Supervised image classification of Mars 2020 PIXL Optical Fiducial System multispectral data and PIXL-analogous petrological characterization of Mars Sample Return Jezero crater floor analogue rocks
Full text linkNASA’s Mars 2020 (M2020) and NASA/ESA’s proposed Mars Sample Return (MSR) missions seek to characterize the surface of Jezero crater, Mars, in search of ancient biosignatures. The Perseverance rover carries a suite of instruments that includes the Planetary Instrument for X-ray Lithochemistry (PIXL) X-ray fluorescence (XRF) spectrometer, and the Sampling and Caching Subsystem (SCS), which collects rock samples for potential return to Earth in a future MSR mission. The overarching objective of the two studies presented in this thesis is to investigate the igneous petrology of Jezero crater’s Séítah (wehrlitic olivine cumulates) and Máaz (basaltic to trachy-andesitic lavas) formations using data acquired in situ by PIXL and from analogous terrestrial rocks. The first study presents a supervised image classification methodology for estimating the modal mineralogy of PIXL rock targets by extrapolating XRF data to a broader area using imagery acquired by PIXL’s Micro Context Camera (MCC). The objective of this investigation is to assess the efficacy of the methodology when applied to PIXL targets from Séítah and Máaz. The methodology was found to perform accurately when applied to coarse-grained rocks, as their texture provides a larger population of training data. Conversely, fine-grained rocks are classified far less accurately because their lack of training data makes them more susceptible to sources of noise in PIXL and MCC data. The second study characterizes terrestrial rocks collected from Rùm, Scotland and Hart Mountain, Oregon as MSR analogues for Jezero’s igneous Séítah and Máaz formations. The objective of this study was to assess the igneous textures, mineralogy, and geochemistry these rocks, and compare them to their martian counterparts, with the goal of establishing them as compelling analogues. The analogues from Rùm possess a similar cumulate texture and ultramafic mineral assemblage to Séítah samples, while the Hart Mountain samples have a finer-grained, plagioclase, augite, and olivine-bearing that resembles the extrusive rocks of Máaz. While geochemical differences exist between the analogues and their martian counterparts, these are explained by inherent bulk chemistry dissimilarities between the Earth and Mars, implying that the Rùm and Hart Mountain samples are accurate terrestrial representations of Séítah and Máaz
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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