1,720,999 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
A Cleaning System for Urban Air Pollution Removal
No full textUniversity of Minnesota Ph.D. dissertation. November 2019. Major: Mechanical Engineering. Advisors: David Pui, Lian Shen. 1 computer file (PDF); xi, 152 pages.Air pollution is a severe issue worldwide, which is adversely affecting the health and living environment of urban population. A novel outdoor air cleaner, named Solar-Assisted Large-Scale Cleaning System (SALSCS), was proposed as an innovative approach to facilitate the separation of particulate matter (PM) from atmospheric air by installing pleated filters in the system. This work first proposed the basic concept of SALSCS, which is composed of a flat-plate solar collector, a chimney, a filter bank, and fans if necessary. A three-dimensional numerical model of the system was developed by using the ANSYS Fluent fluid solver. The numerical results indicated that a full-scale system can generate a total flow rate of 2.64 × 105 m3 s-1 with the pressure drop of installed filter bank considered. In addition, the numerical model was applied to design a demonstration unit constructed in Xi’an with a tower of 60 m in height and a solar collector of 43 × 60 m2 in the horizontal directions. Field measurements were conducted and the obtained experimental data was used to validate the numerical model of SALSCS, which was further applied to investigate the performance characteristics of systems in the dimensional range of 10–120 m. The parameters that considerably influence the system performance have been identified. Meanwhile, atmospheric simulations over the terrain of Beijing were carried out by using the Weather Research and Forecasting (WRF) model to investigate the effectiveness of SALSCS for PM2.5 mitigation. A derived tendency term in the potential temperature equation was applied to simulate the buoyancy effect of SALSCS created with solar heating on its nearby atmosphere. PM2.5 pollutant and SALSCS clean air were simulated in the model domain by passive tracer scalars. Simulation conditions with two system flow rates of 2.64 × 105 m3 s-1 and 3.80 × 105 m3 s-1 were tested for seven air pollution episodes of Beijing during the winters of 2015–2017. The numerical results showed that with eight SALSCSs installed along the 6th Ring Road of the city, 11.2% and 14.6% of PM2.5 concentrations were reduced under the two flow-rate simulation conditions, respectively. To further improve the system’s effectiveness, an air cleaner with a reverse-flow configuration was proposed to be directly installed inside city blocks. An open-source large-eddy simulation (LES) model, called PALM, has been utilized to study the nearby atmospheric flow behavior and investigate its effectiveness in reducing air pollution. A method of incorporating the flow pattern of the air cleaner into the surrounding atmospheric flows was developed. A scenario of two systems operating together has also been investigated. The simulations illustrated that there is a clean air plume with higher turbulence intensity arising near the SALSCS providing a cleaner region within the polluted atmospheric flows. The numerical results indicated that as high as 60-100% of the nearby air pollution can be reduced, depending on its operating conditions and urban topographies. The filtration elements in SALSCS is one of the many applications of pleated filters. This dissertation also presents our experimental study on the flow fields of pleated filters by using the Particle Image Velocimetry (PIV) method. Flow patterns and pressure drop across pleated filters with various pleat configurations have been measured under our laboratory setup. It was found that the pleat geometry impacts the downstream flow pattern more significantly than the upstream pattern. The obtained downstream flow distributions indicated lower permeability at the pleat corner regions due to compression of the fibers. We discovered that when pleat geometry stays unchanged, similarity exists among downstream flow structures of pleated filters with different pleat numbers. These four studies below comprise parts of the main body of this dissertation and have already been published. Chapter 2: Q. Cao, D.Y.H. Pui, W. Lipiński. A concept of a novel Solar-Assisted Large-Scale Cleaning System (SALSCS) for urban air remediation. (2015). Aerosol. Air. Qual. Res. 15 (1), 1-10. Chapter 3: Q. Cao, T.H. Kuehn, L. Shen, S.-C. Chen, N. Zhang, Y. Huang, J. Cao, D.Y.H. Pui. Urban-scale SALSCS, part I: Experimental evaluation and numerical modeling of a demonstration unit. (2018). Aerosol. Air. Qual. Res. 18, 2865-2878. Chapter 4: Q. Cao, M. Huang, T.H. Kuehn, L. Shen, W.-Q. Tao, J. Cao, D.Y.H. Pui. Urban-scale SALSCS, part II: A parametric study of system performance. (2018). Aerosol. Air. Qual. Res. 18, 2879-2894. Chapter 5: Q. Cao, L. Shen, S.-C. Chen, D.Y.H. Pui. WRF modeling of PM2.5 remediation by SALSCS and its clean air flow over Beijing terrain. (2018). Sci. Total Environ. 626, 134-46.Cao, Qingfeng. (2019). A Cleaning System for Urban Air Pollution Removal. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/211323
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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