1,720,964 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
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
Integrated optimization of scale inhibitor squeeze treatment
Get PDFScale inhibitor (SI) squeeze treatment is one of the most widely adopted techniques to
control scale deposition. In this technique, chemical scale inhibitor is injected into the
near-wellbore area where it retains in the formation and then slowly releases in the
produced water when the well is back in production, preventing scale formation at a
concentration of few ppm.
The injection process normally starts with a preflush to condition the rock, and then the
main slug (containing the SI) is injected followed by an overflush to push the chemical
further deep into the reservoir. Before production, a shut-in period is also considered for
more SI retention in the formation. The aim of chemical inhibition is to delay the
deposition kinetics so that scaling issues are deferred from subsurface to surface, where
a much easier access allows easier handling of the deposition risk. The main goal of this
thesis is to present an integrated study of how to optimize the squeeze treatment design
based on the well conditions and by considering the operational constraints.
SI concentration, main treatment volume and the overflush volume are considered for
squeeze design optimization. Using the sensitivity study, the optimum inhibitor
concentration in the main slug is identified. The sensitivity results show that the most
efficient squeeze treatment is achieved when the SI is deployed with the highest possible
concentration, given the formation damage issues are avoided. In most cases, the well is
normally planned to be protected for a target lifetime, this will result in protecting the
well until the next treatment becomes available.
The squeeze lifetime function was shown to be differentiable against the squeeze
parameters, hence a gradient-based optimization algorithm, specifically Gradient Descent
(GD) algorithm was applied to optimize the main treatment and the overflush volume for
a given target squeeze lifetime. This will result in identifying the squeeze “Iso-Lifetime”
curve, which presents all the possible squeeze designs that provide the target lifetime,
using the optimum SI concentration. Based on the iso-lifetime designs, a cost analysis
was carried out to find the optimum treatment, where the CPB (total cost of squeeze per
barrel of water protected during the production period) was minimized, and the design
with the lowest CPB was selected as the optimum one.
For the cases with some flexibility in treatment lifetime, the same approach as described
above was employed for a range of target lifetimes to identify the optimum target. The
target lifetime that demonstrates the minimum CPB was identified as the optimum target
lifetime which can be considered to optimize the treatment in a single well for long-term.
Using this procedure, the optimum long-term strategy for squeeze treatment in a case
study was provided.
Multi-well squeeze design optimization was also studied in this thesis. Multi-well cases
may include scenarios such as treating two or more wells connected to a subsea manifold
or treating several single wells in the field where several wells of the same field are treated
simultaneously in a squeeze campaign. A supply vessel is normally used to deliver the SI
to the wells in a single trip. Due to the limitation of storage capacity on the vessel, the
amount of inhibitor which can be used is limited, hence the available amount of inhibitor
onboard should be optimally distributed among the wells. The squeeze campaign design
was optimized for two field cases, minimizing the total inhibitor volume and the total
downtime/pumping time, using the Multi-Objective Particle Swarm Optimization
(MOPSO) method. Once the wells are squeezed, they should all reach the target lifetime
of the campaign. This is essential such that all wells are protected until the next campaign.
Finally, the Pareto Front was identified for the field, including the optimum squeeze
campaign designs with the minimum cost, leading to the optimum inhibitor allocation
strategy.
The associated uncertainties with squeeze optimization were also considered in
optimization. These uncertainties are mainly related to the retention isotherm which is
normally derived by history matching. There might be several isotherms resulting in a
reasonable history match. This causes uncertainty in squeeze lifetime prediction.
Uncertainty quantification is considered in this research by evaluating the P10/P50/P90
percentiles using the likelihood function.
Finally, scale treatment optimization in geothermal reservoirs was investigated and the
most efficient scale treatment strategy in a geothermal doublet system was identified by
considering three different techniques of SI deployment: continuous injection downhole,
squeeze treatment and batch injection in the injector well. Optimum design for each of
the methods was studied considering different reservoir conditions, and the optimization
results were compared, providing the best scale treatment strategy in the reservoir
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