1,720,956 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Property correlations in materials for energy applications utilising advanced X-ray and photophysical techniques
No full textA thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Faculty of Science, School of Chemistry, University of the Witwatersrand, Johannesburg, 2023Hybrid-perovskites are an emerging material class, with optoelectronic properties highly suited for photovoltaics (PV), light emitting diode, and phosphor applications. Among PVs they have seen a meteoric rise in photon conversion efficiency (PCE) over the last decade, exceeding that of thin-film and multi-crystallite Si PV. Despite the rapid evolution of PCE within these materials, environmental and thermal stability remain the major impediment for their commercial viability. The use of A site cation substitution is an approach to enhance performance and stability in the versatile family of hybrid perovskites.
In this thesis, the effect of A site cation substitution on the phase transitions and stability is explored, for both cations which appropriate for the APbX3 structure, and a larger organo-ammonium cation (A′ ) associated with the formation of lower dimensionality hybrid perovskite derivative structures. Both approaches are reported in literature to provide exceptional stability and PV PCE improvements.
The hybrid perovskite (F AP bI3)0.85(MAP bBr3)0.15 was characterised using in-situ variable-temperature X-ray diffraction (VT-XRD) data. Sequential Rietveld refinements were employed to explore phase stability, and structural characteristics of this data (FA = formamidinium, MA = methylammonium). A more gradual α → β phase transition is identified, compared to the single cation systems in literature. The effect of Caesium (Cs) substitution on (F AP bI3)0.85(MAP bBr3)0.15 has been characterised across a series of VT-XRD measurements through parametric Rietveld refinement. The introduction of Cs is correlated to divergence between the observed onset temperatures for the cubic to tetragonal and a 0a 0a 0 to a 0a 0 c + (Glazer notation) transitions in the systems, which occur for the α/β phase transition. Beyond the performance improvements, the inclusion of larger A′ cations, have been associated with structural defect passivation, and electronic property tuning due to quantum confinement effects in perovskite derived structures.
Hybrid perovskite based systems containing the A′ cation, propylammonium are studied to gain insights on phase stability and phase formation, and optical properties in these systems. The phase composition, structural III properties, and optical properties of (PABr)2x(MABr)1−xPbBr2, 0 ≤ x ≤ 1 and P ABr/MAP bBr3 systems were studied using ex-situ XRD, optical absorbance spectroscopy and photoluminescence measurements (PA = propylammonium). These systems were fabricated by spin coating, with the former from a single well mixed precursor solution and latter a 2-stage process, where PABr was added in various concentrations to a fully formed MAPbBr3 film. Mixed phase compositions were formed of (P A)2MAn−1P bBr3n+1 2- dimensional (2D) and quasi-2D hybrid-perovskite derivative phases, where n determines the layer thickness and n = ∞ is a MAPbBr3 phase. The difference in the kinetic and thermodynamic aspects of film formation in these systems was leveraged to propose a set of controlling factors responsible for the phase formation behaviour of the varied formation conditions.National Research Foundation (NRF)
University of the WitwatersrandTL (2024
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