1,720,985 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
Ingénierie de la catalyse de métaux sélectionnés dans l'oxydation des dérivés de la biomasse à l'aide de calculs DFT
No full textL'hydroxyméthyl furfural (HMF) et le furfural (FF) ont été identifiés comme des plateformes clés de bio-raffinage permettant la synthèse de nouveaux matériaux. La conversion de ces molécules plateformes en intermédiaires repose de plus en plus sur la catalyse hétérogène plutôt que l'approche enzymatique ces dernières années. L'un de ces procédés catalytiques est l'oxydation du HMF et du FF en acide 2,5-furane dicarboxylique (FDCA) et en acide furoïque (FA), en utilisant O2 comme oxydant et des catalyseurs d’or supportés. Cependant, contrôler finement l'oxydation est difficile et ces procédés souffrent généralement de dégradation lors de l'utilisation de catalyseurs hétérogènes, conduisant à un faible rendement et une mauvaise sélectivité pour le FDCA et le FA. Dans cette thèse, nous cherchons à proposer une stratégie de reconception du catalyseur Au pour retarder les activités de dégradation rapportées dans l'oxydation des dérivés de la biomasse (HMF et FF) sur Au. Nous utilisons une approche théorique basée sur la théorie fonctionnelle de la densité périodique. Tout d’abord, nous avons montré que l'activation de O2 lorsque l'on travaille dans un environnement d'eau liquide dépend du métal : OH se forme sur Au, tandis que O se forme sur Pt et Pd. Ensuite, les voies d'oxydation et de dégradation de HMF et FF sur Au ont été identifiées en calculant la stabilité des intermédiaires de surface possibles. Cette étude montre que la fonction alcool est plus difficile à oxyder que la fonction aldéhyde dans le HMF et cette étape est probablement l'étape cinétiquement déterminante. En ce qui concerne la dégradation, les liaisons C-H du cycle furane du HMF sont les plus sensibles à l'oxydation par rapport aux autres voies examinées. L'analyse de la même réaction sur Pt & Pd montre que le mécanisme est le même, avec une plus grande stabilité des intermédiaires conduisant à une plus grande activité mais aussi à une dégradation plus importante. Enfin, l'effet d'alliage sur la catalyse Au a été évalué, ce qui montre que l'alliage AuPd améliore la cinétique, tandis que l'alliage AuPt améliore la sélectivité de l'oxydation du HMF et retarde l'activité de dégradation. Notre étude suggère d’allier Pt et Au pour retarder la dégradation du HMF, la principale menace. Sinon, l'alliage de Pt et Pd avec Au pour former un alliage trimétallique améliorerait la cinétique et retarderait la dégradation du HMF.Hydroxymethyl furfural (HMF) and furfural (FF) have been identified as key bio-refinery platforms for the synthesis of new materials. The conversion of these platform molecules into intermediates increasingly relies on heterogeneous catalysis rather than the enzymatic approach in recent years. One of these catalytic processes is the oxidation of HMF and FF to 2,5-furan dicarboxylic acid (FDCA) and furoic acid (FA), using O2 as oxidant and supported gold catalysts. However, oxidation faces degradation challenges when using heterogeneous catalysts, leading to low yield and poor selectivity for FDCA and FA. In this thesis, we proposed a redesign strategy of the Au catalyst to retard the degradation activities reported in the oxidation of biomass derivatives (HMF and FF) on Au. Our study uses a theoretical approach based on the periodic density functional theory. First, we showed that the activation of O2 when working in a liquid water environment is metal dependent: OH forms on Au, while O forms on Pt and Pd. Then, the oxidation and degradation pathways of HMF and FF on Au were identified by computing the stability of possible surface intermediates. This study shows that the alcohol function is more difficult to oxidize than the aldehyde function in HMF and this step is probably the rate-determining step. Regarding degradation, the furan ring’s C-H is the most sensitive to oxidation compared with other routes examined. Analysis of the same reaction on Pt and Pd shows the mechanism to be the same, with greater stability of intermediates leading to higher activity but also higher degradation. Finally, the effect of alloying on Au catalysis was evaluated, showing that AuPd alloy improves the kinetics, while AuPt alloy improves HMF oxidation selectivity and delays degradation activity. Our study suggests alloying Pt and Au to retard HMF degradation, the main threat. Alternatively, alloying Pt and Pd with Au to form a trimetallic alloy would improve kinetics and retard HMF degradation
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
- …
