1,720,956 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
CFD modelling guidelines to analyse the effects of drag on freight trains
No full textLAUREA MAGISTRALEIl settore dei trasporti svolge un ruolo cruciale nell'economia globale, con i treni merci che sono una componente chiave per il movimento efficiente delle merci su lunghe distanze. Tuttavia, il consumo energetico e le prestazioni aerodinamiche dei treni merci sono diventati un problema critico. Il miglioramento dell'efficienza aerodinamica dei treni merci può ridurre significativamente il consumo di carburante, offrendo vantaggi sia economici che ambientali.
Negli ultimi anni, la fluidodinamica computazionale (CFD) è emersa come un potente strumento per studiare e ottimizzare le proprietà aerodinamiche di vari veicoli, compresi i treni merci. Sono attese a breve norme e linee guida standard per la modellazione di un modello CFD per i treni merci per studiare gli effetti della resistenza aerodinamica. La motivazione di questa tesi si concentrerà sulla fornitura di linee guida per la creazione di un modello CFD per un treno merci per analizzare l'effetto della resistenza aerodinamica. Secondo le norme CEN, la soglia di errore relativo tra i risultati del modello CFD e le prove sperimentali è inferiore al 15%. Per raggiungere questo obiettivo, sono state eseguite simulazioni numeriche utilizzando il software OpenFOAM con modello RANS e modello di turbolenza k-ω SST. In primo luogo, l'analisi del dominio è stata eseguita per trascurare gli effetti di contorno. Successivamente, è stata eseguita una sensibilità della maglia per determinare l'intensità ottimale della griglia per ottenere risultati accurati. È stata poi effettuata l'Indipendenza dell'effetto Reynold per verificare l'affidabilità dei modelli in scala nel prevedere il flusso come in un sistema reale. Questo modello CFD con una specifica configurazione del gap di carico è stato simulato e poi convalidato con i dati sperimentali della prova in galleria del vento.
Successivamente, il modello CFD convalidato è stato utilizzato per studiare l'effetto sul coefficiente di resistenza aerodinamica di varie configurazioni di fessure di carico a monte e a valle del contenitore di prova. L'analisi ha rivelato che, una volta raggiunta una lunghezza critica della fessura, il flusso si comporta come un flusso libero verso il container di prova e il valore del coefficiente di resistenza aerodinamica tende asintoticamente al valore massimo. Successivamente, sono state aggiunte caratteristiche alla geometria del container di prova del treno merci per renderlo realistico e sono state effettuate simulazioni per studiarne l'effetto sulla resistenza aerodinamica. Con l'aggiunta delle caratteristiche, il coefficiente di resistenza aerodinamica è aumentato e l'errore relativo con i risultati sperimentali è stato inferiore a quello della geometria originale.
Infine, questo modello CFD è stato ulteriormente sviluppato per simulare le condizioni di vento laterale e analizzare qualitativamente il suo effetto sui treni merci.The transportation sector plays a crucial role in the global economy, with freight trains being a key component in the efficient movement of goods over long distances. However, the energy consumption and aerodynamic performance of freight trains have become critical concerns. Improving the aerodynamic efficiency of freight trains can significantly reduce fuel consumption, offering both economic and environmental benefits.
In recent years, Computational Fluid Dynamics (CFD) has emerged as a powerful tool to study and optimize the aerodynamic properties of various vehicles, including freight trains. Standard regulations and guidelines towards modelling a CFD model for freight trains to study the effects of drag is expected soon. The motivation of this thesis will focus on providing guidelines to create a CFD model for a freight train to analyse the effect of drag. In CEN norms, the threshold for relative error between the results of CFD model and experimental test is less than 15%. To achieve this, numerical simulations were performed using OpenFOAM software with RANS model and k−ω SST turbulence model. Primarily, Domain analysis was done to neglect the boundary effects. Next, a mesh sensitivity was accomplished to determine the optimal grid intensity to obtain accurate results. Then, the Reynold’s effect Independence was carried out to verify the reliability of scaled models to predict the flow as in a real system. This CFD model with a specific loading gap configuration was simulated and then validated with the experimental data from wind tunnel test.
Later, this validated CFD model was used to study the effect on the coefficient of drag of various loading gap configurations in upstream and downstream of the test container. This analysis explained that, after a critical gap length was attained, the flow acts as a free flow towards the test container and the value of the drag coefficient tends asymptotically towards the maximum value. After which, features were added on the geometry of test container of the freight train to realise it as a realistic container and simulated to study its effect on drag. With features being added the drag coefficient increased and its relative error with the experimental results were lower than those of the original geometry. At last, this CFD model was further developed to simulate the Crosswind conditions to qualitatively analyse its effect on freight trains
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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