1,720,954 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
Flow control of low-reynolds number airfoils using morphing surface
No full textThis thesis investigates the application of traveling wave surface morphing as an advanced
active flow control method to enhance the aerodynamic performance of airfoils operating at
low Reynolds numbers of 1000 and 20,000. The motivation for this study stems from the need
to address flow separation and improve aerodynamic efficiency in low-speed applications, such
as micro air vehicles (MAVs) and unmanned aerial vehicles (UAVs). The study focuses on the
NACA 0018 airfoil, analyzing its aerodynamic behavior under various traveling wave
configurations (frequency, amplitude, and wavelength) across different angles of attack,
ranging from 7 to 15 degrees. Through a combination of computational fluid dynamics (CFD)
methods, including the Immersed Boundary-Lattice Boltzmann Method (IB-LBM) and Large
Eddy Simulation (LES), and simulations conducted using OpenFOAM, along with machine
learning (ML) techniques, the research provides comprehensive insights into the optimization
of traveling wave parameters for enhanced lift-to-drag ratios and delayed flow separation. The
findings at a Reynolds number of 1,000 demonstrate that backward traveling waves
significantly improve the aerodynamic performance of the NACA 0018 airfoil. Numerical
simulations show that, for wavelengths between 0.1 and 0.4, the lift-to-drag ratio increases
12% from 3.21 to 3.55, compared to the baseline unactuated case where the ratio remains at
2.83. In contrast, forward traveling waves are shown to decrease the lift-to-drag ratio due to
the induction of reverse flows on the suction side, highlighting the superiority of backward
traveling wave actuation. The results show that amplitudes and frequencies play a crucial role
in achieving optimal flow control. At an amplitude of 0.003 and a frequency of 1.5, backward
traveling waves generate a lift coefficient four times higher than those at a low frequency of
0.25. At a higher Reynolds number of 20,000, traveling wave actuation continues to exhibit
remarkable effects on flow separation control and turbulence management. Results reveal that
backward traveling waves not only enhance lift but also reduce drag by controlling the
turbulent kinetic energy (TKE) and generating coherent flow structures such as quasi-
streamwise vortices and reverse horseshoe vortices. A parametric study shows that a
wavelength of 0.3, an amplitude of 0.003, and a frequency of 1.0 yield the maximum lift-to-
drag ratio of 5.47, compared to 2.91 (i.e. by approx. 88%) for the unactuated airfoil.
Furthermore, large coherent structures (LCS) analysis demonstrates the ability of traveling
waves to stabilize boundary layer dynamics and delay flow separation, especially at higher
angles of attack. For example, at an angle of attack of 11°, the suction peak reduces from −2.15
in the unactuated case to −1.27 with traveling wave actuation, significantly shrinking the
separation bubble. This study also analyzes TWM's effects on boundary layer stability, flow
separation, and vortex structures across angles of attack (7°, 11°, and 14°). The results show
that TWM organizes vortex structures, enhances boundary layer mixing, and delays flow
separation, significantly reducing drag and stall effects. Higher amplitude TWM (a=0.02)
achieves the best results, stabilizing the boundary layer and creating a quasi-laminar flow even
at high angles of attack. These findings highlight TWM as a promising technique for improving
lift and reducing drag in aerodynamic applications. These findings demonstrate the novelty of
applying advanced flow control techniques to a thicker airfoil profile, broadening the scope of
aerodynamic research.
The integration of CFD simulations with machine learning models, such as Gaussian Process
Regression (GPR), Support Vector Machines (SVM), and Decision Trees (DT), enables
efficient prediction and optimization of aerodynamic coefficients. Machine learning techniques
are applied to analyze 93 simulation cases, revealing strong correlations between wave
parameters (frequency, amplitude, and wavelength) and aerodynamic forces. For instance, the
optimal wave configuration at an angle of attack of 11° achieves a drag reduction of 40% and
a lift increase of 20%, reducing computational time significantly compared to traditional CFD
methods.
The thesis highlights the transformative potential of traveling wave surface morphing in
advancing airfoil design for low Reynolds number applications. By bridging numerical
methods and machine learning, this study introduces a practical framework for real-time
optimization of aerodynamic performance. The research establishes that backward traveling
waves are highly effective in mitigating flow separation, enhancing lift-to-drag ratios, and
controlling turbulent flow structures
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
- …
