1,721,043 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
First-principles assessment of UBI-QEP semi-empirical method for predicting catalytic mechanisms : an application to CO2 activation via r-WGS reaction
No full textLAUREA MAGISTRALEL’applicazione di modelli multi-scala a base first-principle all’analisi di modelli microcinetici di processi di catalisi eterogenea è limitata dall’intrinseca complicazione e complessità dei sistemi catalitici, specialmente su scala microscopica. In questo contesto, la complicazione viene introdotta dalla necessità di fornire una descrizione accurata degli eventi reattivi coinvolti nei meccanismi catalitici in differenti condizioni dell’ambiente reattivo. Sebbene metodi DFT siano i più adatti alla descrizione di superfici di energia potenziale, processi reali richiedono ingenti costi computazionali per condurre la loro modellazione microcinetica. Pertanto, metodi semi-empirici a minor costo computazionale quali lo UBI-QEP diventano attraenti per una selezione preliminare di complessi schemi di reazione.
In questo lavoro, viene condotta un’analisi sistematica del metodo semi-empirico UBI-QEP attraverso calcoli first-principles con l’obiettivo di verificare la validità e l’attendibilità di questo approccio come effettiva via d’uscita dalla trappola della complicazione nella modellazione microcinetica di sistemi catalitici. Come caso studio è stata scelta l’attivazione della CO2 via r-WGS su una superficie Rh(211) per la validazione del modello semi empirico poiché l’effetto di specie debolmente assorbite come la CO2 sulle capacità predittive del modello al livello di meccanismi di reazione completi non è stato precedentemente e investigato. Più precisamente, vengono considerati tre differenti meccanismi partendo da CO2 e H2 in fase gas, ciascuno a diverse condizioni di ricoprimento superificiale di monossido di carbonio. La dissocaizione diretta, dando CO e O, e due percorsi di dissociazione mediati dall’idrogeno coivolngenti due diversi intermedi, rispettivamente t-COOH e HCOO. L’analisi delle singole reazioni elementari rivela potenzialità e limiti del metodo UBI-QEP che si osserva essere in grado di prevedere energie di attivazione dipendenti dal ricoprimento superficiale sulla base di energie di adsorbimento dipendente dal ricoprimento superficiale quando sia i reagenti che i prodotti sono chemisorbiti sulla superficie, mentre fallisce quando uno dei reagenti o prodotti interagisce debolmente con la superficie catalitica. L’analisi dei cammini di attivazione predetti da DFT e UBI-QEP con divere parametrizzazioni permette di mostrare nuove scoperte sui percorsi dominanti e stati cineticamente determinanti della r-WGS su catalizzatori a base di Rh ed anche un ulteriore verifica del metodo semi-empirico. Inoltre, è stato analizzato in dettaglio l’effetto delle interazioni adsorbato-adsorbato sull’energetica reattiva e di adsorbimento. Infine, viene condotta un’analisi critica delle limitazioni del metodo UBI-QEP e di come superarle come prospettive future di questo lavoro.The application of first-principles based multiscale modelling to microkinetic analysis of heterogeneous catalytic processes is hampered by the inherent complication and complexity of catalytic systems, especially at the microscopic scale. In this framework, complication is brought in by the necessity of achieving an accurate description of the reacting events involved in catalytic mechanisms at different reaction conditions. While DFT- based methods are the most suitable for the description of potential energy surfaces, real processes require huge computational costs for carrying on microkinetic modelling. Therefore, less computationally demanding semi-empirical methodologies such as the UBI-QEP method emerge as more appealing for a preliminary screening of complex reaction networks in catalytic systems but its accuracy remains in general uncertain.
This work provides a systematic benchmark of UBI-QEP semi-empirical method against first-principles calculations, aiming at validating the reliability of such approach as an effective way to escape the trap of complication. The CO2 activation via r-WGS reaction (CO2 + H2 → CO + H2O) on a Rh(211) surface at different levels of carbon monoxide coverage is chosen as case study since the effect of weakly adsorbed molecules such as CO2 on model performances has not been assessed at the level of full reaction mechanisms. In particular, three mechanisms are studied: the direct dissociation and two hydrogen mediated paths involving respectively trans-COOH and HCOO as intermediates. The analysis of single elementary steps shows potentials and limitations of the UBI-QEP method which proves capable to predict coverage-dependent activation energies based on coverage dependent binding energies when both reactants and products are adsorbed on the surface while fails when either a reactant or a product is weakly interacting with the surface. The analysis of the full activation paths as predicted DFT points out that the hydrogenation to trans-COOH mechanisms dominates r-WGS reaction at 1/6 and 2/6 CO ML, while at zero coverage it is comparable to the direct dissociation mechanism. Differently, the UBI-QEP semi-empirical method conceives the direct dissociation as energetic prevalent path for the CO2 activation at all coverages. This discrepancy is due to the intrinsic limitations of the UBI-QEP semi-empirical method, specifically to (1) the unreliability of the method when dealing with physisorbed molecules such as CO2, and (2) the blindness of the method to the nature of the TS and therefore to the physics of the reaction. Finally, a critical analysis of the limitations of the UBI-QEP semi-empirical method and how to overcome them is provided as future developments for this wor
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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