1,720,955 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
Sound Generation by Hydrogen/Methane Premixed Flames
No full text© 2022 Jen Zen HoHydrogen produced by renewable energy is a promising alternative fuel that can be used to decarbonise the electricity generation sector. Mixing hydrogen with natural gas can smoothly transition current energy generators towards producing less greenhouse gas emissions while mitigating the challenges faced by burning pure hydrogen. However, there are challenges in the usage of hydrogen because it has very different flame characteristics compared to conventional fuels used in gas turbines such as natural gas.
One of the major challenges faced by combustor designers is thermoacoustic instability. This instability occurs when the acoustics of the combustor couple with the flame and generate very loud high frequency pressure oscillations that can damage the combustor and reduce the lifespan of equipment. Hydrogen addition to the fuel can initiate thermoacoustic instability, hence it is important to understand the impact that hydrogen addition has.
Thermoacoustic instabilities are closely linked to sound generation by flames. In addition, many combustors produce loud noise which are subject to stringent regulations. Predicting the sound generated by flames is key to designing safer and quieter combustors. However, there is little information in the literature on the effect of hydrogen addition on the sound generated by flames.
This thesis will utilise high fidelity simulations, specifically Direct Numerical Simulations (DNS), to simulate turbulent premixed jet flames with different hydrogen/methane fuel content. Firstly, planar one-dimensional (1D) annihilation events are simulated for different hydrogen/methane mixtures and the pressure waves generated by these events are compared. It is found that the flames fuelled with hydrogen/methane mixtures undergo a three-stage annihilation event, with the first stage generating long-wavelength pressure waves. This first stage is not present in pure hydrogen or pure methane fuelled annihilation events. These simulations are used to develop a reduced chemical mechanism with low computational cost, enabling three-dimensional (3D) DNS of the turbulent premixed jet flames.
The 3D DNSs are then performed and the sound generated by the flames is compared for different hydrogen/methane fuel mixtures. The dependence of the sound on the flame dynamics and the flame stretch, displacement speed and curvature is characterised. The Sound Pressure Level (SPL) of the sound waves generated by annihilation events is found to increase with hydrogen content in the fuel. This effect is due to the increase in laminar flame speed with hydrogen addition.
In annihilation events, heat release rate fluctuations are the dominant source of noise. However, there has not yet been a full comparison of all noise sources in a turbulent premixed jet flame. In this work, an acoustic analogy is used to find the contribution of all physical mechanisms by which sound is generated in the flame. It is found that the heat release rate fluctuations and turbulence are the principal sources of noise for all cases. To retrieve the pressure fluctuations from turbulent eddies, the superposition of three different sources, specifically the (a) Lighthill stress tensor source, (b) entropy inhomogeneity source, and the (c) surface contribution, must be used. These three sources are found to be intrinsically linked with each other. In addition, the energy transport by mass diffusion is found to be an important source of sound when hydrogen and methane are equally mixed in volume, and unimportant when one fuel is dominant
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
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
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
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