1,720,957 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
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
Upscaling bifunctional materials for Ca-Cu looping: fixed bed reactor tests
No full textPoster presented at the 10th "Trondheim Conference on CO2 Capture, Transport and Storage", June 17 - 19, 2019, in Trondheim - Norway.Calcium-Copper Chemical Looping Technology is a hybrid concept combining Sorption-Enhanced Reforming (SER) and Chemical Looping Combustion (CLC) for hydrogen production from natural gas with integrated CO2 capture.
SER involves reforming, water gas shift and CO2 capture in the same reactor vessel (reformer) making use of a CaO-based high temperature solid sorbent to capture the CO2:
CH4 (g) + 2H2O (g) + CaO → CaCO3 + 4H2(g)
This leads to process intensification due to avoidance of additional water gas shift steps as well as a downstream CO2 separation system, while hydrogen concentrations up to 98 vol% (dry basis) can be obtained at temperatures around 650 °C at 1 bar. To regenerate the sorbent at high temperature (900 °C, 1 bar), heat is provided via indirect heating2 or direct oxy-fuel combustion3.
In the Ca-Cu Looping technology, a second Cu/CuO loop is introduced in the process and the calcination of CaCO3 is coupled and thermally sustained by the exothermic CuO reduction with H2, CO and/or CH4. In this way, expensive Air Separation Unit (ASU) or heat exchange surfaces are avoided, while fixed bed reactors are preferred to fluidized beds allowing the production of pressurized H2 without circulation of solids. Specific Energy Consumption (SPECCA) for the Ca-Cu process have been found to be in the range 1.1-1.5 MJ/kgCO2, which compares well with oxy-SER (1.6-2) and benchmark Fired Tubular Reactor / MDEA system (3.5) 4–6.
The novelty proposed in this work is to combine CaO and CuO phases into one bi-functional material using relatively low-cost raw materials as well as an easy and scalable synthesis method. This configuration has the potential to a) lower the inert fraction in the reactor bed and thus limit the sensible heating requirement in the reactor, and b) to promote close contact between the CaO and CuO phases, improving the heat and mass transfer compared to a segregated particle arrangement.
Mayenite, a suitable phase for increasing the stability of CaO-based synthetic sorbents7, has been used to support the Ca-Cu combined materials. In a previous work, the effect of the CuO precursors (Cu(OH)2, Cu(NO3)2 and CuO mesh powder), and the CuO-CaO loading (at constant weight ration of 2) on the hydrothermal synthesis of combined powder has been investigated in TGA for about 40 carbonation-calcination and oxidation-reduction cycles. This study has shown that 40 wt% CuO
materials are stable for 40 TGA cycles while all investigated 50 wt% CuO materials deactivate, regardless of CuO precursor 8.
Subsequently, the synthesis method has been upscaled to produce 100g of powders which have been agglomerated to particles with 0.5 – 0.8 mm diameter, and subjected to 40 carbonation-oxidation-reduction-calcination cycles in TGA. The agglomerates of the combined Cu(OH)2 prepared powder are stable for 40 TGA cycles, although suffer from an initial 25 wt% capacity reduction in both O2 and CO2 capacities relative to the Cu(OH)2 powder.
Finally, the combined material agglomerates have been mixed with a commercial reforming catalyst and tested in a lab scale fixed bed reactor along the three main reaction stages of a Ca-Cu looping process – SER, Cu oxidation and Cu reduction. Operation conditions chosen for the process stages were representative for the scaling up of the process in terms of pressure, gas spatial velocities and gas composition.
The obtained evolution of product gas composition with time, as well as the temperature profiles within the bed along each reaction stage during three complete cycles (as depicted in Figure 1 for the SER step) has validated the combined materials concept at lab scale, and shows promises in terms of increased amount of active material per reactor volume.This work is funded by the Research Council of Norway in the framework of CLIMIT-prosjekt 254736Ca-Cu CyclesPeer reviewe
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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