1,720,967 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
SITE-SELECTIVE ATMOSPHERIC PRESSURE PLASMA-ENHANCED CHEMICAL VAPOUR DEPOSITION PROCESS FOR MICROMETRIC DEPOSITION – SIMULATION AND EXPERIMENTAL STUDY
No full textAtmospheric Pressure Plasma has been used to enhance and/or initiate the Chemical Vapour Deposition (AP-PECVD) to deposit thin films or functional layer coatings over a large surface area on a large range of substrates. Now an ability to localise the AP-PECVD coating on an area of interest and control the deposition’s dimension showed its potential application as a viable technique to perform Additive Manufacturing (AM). Additive Manufacturing (AM) is a bottom-up approach in which 2-D patterning or 3-D structures are built using a layer-by-layer deposition. AM allowed easy design optimization and quickly provided the customized parts on demands, thus making itself a very popular technique in the mainstream manufacturing process. As such, it has a wide application in automotive, optics, electronics, aeronautics, medical and biotechnology fields. However, the existing AM printing techniques have some limitations regarding high-resolution printing deposition in a wide variety of substrates and very often get restricted to the types of precursors that could be printed. Whereas, due to the high energetic/reactive species in non-thermal plasma, the AP-PECVD deposition has been obtained using a wide range of precursors on a versatile surface. Thus, there has been a growing interest in performing an area selective localised AP-PECVD coating, mainly by adapting the design of the PECVD reactor. Hence, this thesis aims to design, optimize and study a one-step mask-free AP-PECVD plasma process that could locally deposit the material of interest with high precision to perform AM.
In the thesis, the technical approach undertaken by the home-built prototype “plasma torch” is to decouple the plasma generator annular tube and the precursor injector central capillary. This approach has allowed a way to tune the diameter of the deposited dot by changing the dimension of the precursor injector, which has been demonstrated by the deposition of the micro-dot as small as 400µm in diameter. Further, the flexibility to move the capillary tube without significant changes in the plasma torch's overall geometry has also allowed for selectively injecting the precursor (Methylmethacrylate, MMA) in the spatial plasma post-discharge region. Thanks to this setting, the deposited dot has high retention of monomer's chemistry (functional group) and unprecedented molecular weights (oligomeric chain up to 18 MMA units). Hence, initially, a novel area selective AP-PECVD plasma torch design has been demonstrated, and its performance has been defined to obtain the micro resolution coating.
During the research work, gas flow rates have been identified as a crucial parameter in obtaining the localised coating; three kinetic regimes with different coating morphology have been discovered. By performing a thorough computational fluid dynamic (CFD) simulation of the torch phenomena, it has been possible to establish a parallel between the fluid behaviour and the deposition size. The deposition was found to be confined in a zone created by the dynamical behaviour of gas, i.e., re-circulating vortices between the torch and substrate. Hence, later the gas flow rate was used to tune the diameter of the confinement zone, which in return changed the diameter of the deposited dot.
The gas flow dynamic impacts the involved species, i.e., reactive plasma species, precursor molecules, and the open-air interaction and distribution on the surface of the substrate. When organosilicon precursors with the presence or absence of vinyl bond and/or ethoxy groups are used, it results in different depositional chemical reactions and depositional patterns. The correlation between the depositional patterns and the mass fraction distribution of involved species has been obtained thanks to the performed CFD simulation done in parallel. Further, the likelihood of deposition mechanisms like "vinyl group opening by free radical" for vinyl containing precursor resulting in silicon oxycarbide-like (SiOxCyH) structural deposition, and the Reactive Oxygen Species (ROS)-induced "fragmentation and adsorption" deposition mechanism resulting in silica SiOx like structural deposition for siloxane containing precursor has been suggested and discussed. The understanding gained from this systematic case study implies the importance of reactive plasma species in the underlying deposition mechanisms; hence, it has been suggested that tuning/tailoring its distribution can alter the chemical nature of deposition and its pattens.
Overall, this thesis work provides insight into area selective AP-PECVD coating (plasma printing) and demonstrates that plasma technology is a viable option for additive manufacturing. The findings would be helpful in both designing the AP-PECVD plasma torch and selecting precursors for the desired organic/inorganic deposition. Thanks to the insight gained during the thesis work, the home-designed prototype of the plasma torch has been upgraded to implement in a commercial 3-D printer
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
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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