1,720,957 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
Experimental and modelling study of through-plane radical scavenger impact on performance and oxygen mass transport resistance during PEM fuel cell ageing
No full textLAUREA MAGISTRALELo ionomero perfluorusolfonico è ampiamente impiegato come membrana elettrolitica polimerica nei dispositivi di conversione elettrochimica dell’energia, come le celle a combustibile (PEMFCs). Tuttavia, durante il funzionamento delle PEMFC si ha la formazione di radicali liberi che attaccano la catena polimerica dello ionomero PFSA determinandone la degradazione chimica. Una delle strategie di mitigazione più promettenti consiste nell’incorporazione di additivi, scavenger radicalici, come gli ioni cerio, che reagiscono con i radicali liberi neutralizzandoli tramite reazioni redox. Nonostante gli effetti benefici, il cerio pone anche alcune criticità. La sua elevata mobilità ha un impatto negativo sia sulla vita utile della membrana sia sulle prestazioni complessive della cella a combustibile. È noto, infatti, che gli ioni cerio migrino tra la PEM e gli strati catalitici, e che il loro accumulo nell’elettrodo catodico rappresenti un fattore chiave che contribuisce alle perdite prestazionali. In questo contesto, lo scopo di questo lavoro è stato quello di indagare in profondità i principali meccanismi di trasporto through-plane del cerio e il suo impatto sul degrado dell’elettrocatalizzatore catodico. A tal fine, una campagna sperimentale su celle commerciali (CCMs) dopate con ioni Ce ed invecchiate artificialmente secondo il protocollo Electrocatalyst AST è stata affiancata da un’attività modellistica che ha sfruttato un modello 1D through-plane di prestazioni opportunatamente modificato per tener conto del trasporto degli ioni Ce. I risultati evidenziano un duplice effetto degli ioni cerio: da un lato una riduzione della conducibilità protonica, dall’altro un impatto significativo, e finora non del tutto chiaro in letteratura, sulla resistenza al trasporto di massa dell’ossigeno, effetto che risulta ulteriormente accentuato in condizioni di bassa umidità relativa (ad esempio, passando da un CCM di riferimento ad uno fortemente dopato, a 2.5 bar, la resistenza al trasporto di massa aumenta di circa il 7% in condizioni completamente umidificate e del 38% in condizioni secche). Tali risultati sono stati supportati da valutazioni quantitative su campioni sia ad inizio vita che durante il degrado, insieme a un’analisi finale che propone possibili strategie di mitigazione basate su parametri strutturali per ridurre l’impatto negativo degli scavenger radicalici sulla resistenza al trasporto di massa.Perfluorosulfonic acids are widely employed as polymer electrolyte membranes in electrochemical energy devices, such as fuel cells (PEMFCs), but their durability is limited by chemical degradation induced by radical species during operation. One of the most promising mitigation strategy involves the incorporation of radical scavengers, such as cerium (Ce) ions, which react with free radicals, neutralizing them through redox reactions. Despite its beneficial effects cerium also poses some critical challenges. Their high mobility and the creation of a multi-ion environment can negatively impact both membrane stability and overall fuel cell performance. Indeed, Ce ions are known to migrate between PEM and catalyst layers, and their accumulation in the cathode electrode is considered a key factor contributing to performance losses. In this scenario, the aim of this work was to investigate deeply the main driving forces of through-plane transport and its impact on PEM fuel cell performance, with a particular focus on oxygen mass transport resistance, both at beginning of test and during cell ageing. For this purpose, an experimental campaign on Ce doped catalyst coated membranes (CCMs), artificially aged by the Electrocatalyst Accelerated Stress Test protocol, was coupled with a modelling activity relying on a 1D physics-based performance model. The results evidence both a detrimental effect of cerium ions on both proton conductivity and, most of all, provided new insights into its negative impact on oxygen mass transport, a topic still not fully clarified in literature, with these effects further exacerbated at low relative humidity (e.g. moving from the reference CCM to the highly doped one, at 2.5 bar, mass transport resistance rises by ~7% under fully humidified and ~38% under dry conditions). These novel findings were supported by quantitative evaluations on both pristine and aged samples, which evidenced a growth together with a final analysis proposing possible mitigation strategies based on structural parameters to reduce the adverse impact of radical scavengers on mass transport resistance
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
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