1,721,008 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
Hydrogen Production by Composite Photocatalyst & Mechanism Analysis
No full text本研究選取鱗片石墨作為光催化複合半導體材料的部份原料，應用Hummers改良法合成以石墨烯為基礎的多種具有較高關注度的含碳材料，後經過不同步驟的還原反應，與主要選取的硫化鎘及氧化鎢光催化劑進行披覆，合成多種用於產氫的光催化材料。 製成的半導體材料通過FTIR、XRD、SEM、EDS、UV-Vis等儀器對複合半導體進行表面分析，確認所製成材料的性質從而探討影響其光催化效率的原因。并探討最佳觸媒投加量；Gr/CdS複合材料中Gr的最佳重量比；N-Gr/CdS、Gr/CdS兩種不同石墨改質材料光催化效果的比較及分析；Gr/CdS與WO3分別投加及Gr/CdS/WO3合成材料直接用於光催化反應效果的影響；光催化反應及其對應反應機制的探討，以及三種不同犧牲劑對反應產量的影響。 結果表明，通過物化分析，Graphite oxide、N-graphene、Graphene以及其他光觸媒複合材料都被成功的合成，且有較理想的晶體形態及催化效果。實驗結果證明N-graphene/CdS並未表現出預計的催化效果。而Gr/CdS相比之有更好的光催化產氫率。在0.4 g光觸媒投加劑量下，以Na2S/Na2SO3做為犧牲劑，4 wt%Gr/CdS/WO3複合材料在可見光照射下可達到最佳催化效果，產氫在5小時後量達611μmol·h-1。 本研究結果可作為對光催化領域進一步研究的參考，石墨烯複合的光催化材料具有較理想的研究潛力。在此研究基礎上，可進一步探討材料合成的改進條件及其對產氫可能產生的理論影響。We utilized crystalline flake graphite as one of the raw material to synthesize the graphene based semiconductor of photo-catalysts which are extensively concerned. In this research, the modified Hummers method was used to synthesize graphene, whereafter, CdS and WO3 powders were added into the material to compose the compound photo-catalysts for hydrogen production. We further used instrument analysis such as FTIR, XRD, SEM/EDS and UV-Vis to confirm the crystal structure and the potential capability of photo-catalysis. The analysis includes, the optimal dosage and mixed ratio between different substances of compound semiconductor, the effect of doping Gr or N-Gr onto, the impact of WO3 in ternary hybrid and the different effects between three types of sacrificial reagents. The results showed that all the materials including Graphite oxide、N-graphene、Graphene were successfully synthesized and the ideal crystal structure can promote the photo-catalysis effectively. In the contrary, N-graphene/CdS had negative effect comparing with expectation, but not the Gr/CdS. The Gr/CdS can perform the best efficiency and achieve the hydrogen productivity of 611μmol·h-1 after 5 hours reaction under the condition of using Na2S/Na2SO3 as sacrificial reagent with dosage of 0.4 grams. This research testified the promising application of graphene based compound photo-catalysts that may be served as role materials in water splitting. However, further more details can be discussed in future researches to purify the compositions
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
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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