1,721,013 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
Computational design of nanostructured materials with renewable energy applications
Get PDFPrograma de Doctorado en Medio Ambiente y SociedadLínea de Investigación: Simulación Molecular de Sistemas Complejos con Aplicaciones MedioambientalesClave Programa: DAMCódigo Línea: 89This thesis studies the viability of various materials as key pieces in the construction of thermosolar power plants as well as for the storage of solar energy. As these materials are exposed to extreme pressure and temperature cycles, it is important to study their behavior under these conditions. To do this, we have used different techniques with classical and quantum calculations at the molecular level. These calculations are essential to understand the structural behavior of materials as well as to design and predict the behavior of new materials.
The purpose of the thesis is divided into two parts clearly related to each other: (1) to develop new methods to fit force fields of relevant materials in the energy plan, starting from the electronic density computed with DFT and avoiding the numerical dependence of the parameters of the potentials, and (2) design new nanostructured materials that can improve energy efficiency overcoming the adverse weather conditions of solar thermal power plants, using, where possible, models of force fields improved with our new methodology.
The thesis is divided into six chapters covering the following topics:
Chapter 1. In this chapter we begin with a summary of the thesis and continue presenting each and every one of the methods and materials used. We also present the theoretical basis behind this study, specific and detailed methodology as well as hardware and software specifications used for all analyzes.
Chapter 2. We developed a new method to fit the parameters of an interatomic potential for nickel-chromium alloys, improving the prediction of the structural properties of these materials. To do this, we have designed an algorithm that carries out a series of iterations, in which the parameters of an existing potential are fitted, in order to optimize them based on a series of experimental observables.
As an application, we study different structural properties of alloys with different concentrations of nickel-chromium, as well as nanoparticles of different sizes using the developed potential. We include at the end an example of the possible sintering of pairs of nanoparticles of this material.
Chapter 3. We improve the fitting method developed in Chapter 2 and the prediction of the properties of metallic alloys. The improvement resides in the quantum study of the electron density of these materials, from which we fit the parameters of the classical potentials corresponding to said density. The use of ab-initio observables represents a qualitative advance, since obtaining the force fields is not subject to the value of the experimental observables. In addition, we expanded the composition of the metallic alloys studied by adding iron and molybdenum to the model, with the intention of getting as close as possible to the composition of INCONEL 625.
Chapter 4. This chapter is the first of two focused on the search for new energetic materials. We have proposed, from a theoretical point of view, a new ordered nanoporous metal using as a model Metal-Organic Frameworks (MOFs), MOFs with modified ligands, zeolites and cristobalites, substituting SiO4 tetrahedra for supertetrahedra. The process is simple, using a program written in FORTRAN, we have filled the pores of these materials with metal and we have removed the original structure. We have performed 100 nanosecond molecular dynamics at different temperatures to verify that the ordered nanoporous metals are stable. For these simulations, we have used some force fields from the literature in addition to those developed by us in the previous chapters.
The predictive power of this study is useful from an experimental point of view, since it relates the limiting diameter of the pores as a function of the stability of the new materials. The diffusion of relevant molecules in various fields such as water and xylene is studied as an application of these materials.
Chapter 5. We continue with the creation of new materials presenting one composed of cubic silicon carbide nanoparticles in an amorphous silicon matrix, as an alternative to metallic alloys, due to the high resistance of this type of ceramics to temperature changes. To do this, we have studied simple structures of cubic, hexagonal and amorphous silicon carbide with a series of potentials to determine which of them best models the structural properties compared to existing experiments. Once this was done, we studied two composite materials, (1) flat interfaces of cubic silicon carbide versus amorphous silicon and (2) nanoparticles arranged within matrices of amorphous silicon. We have studied both types with different sizes to observe their behavior based on their densities.
This study was complemented on the microscopic and macroscopic scale. On the first one, the mechanical properties of these materials were studied by performing microstructural lattice simulations. On the second one, to complete the upscaling approach, we have created ceramic tubes for receivers of thermo-solar power plants, seeing their temperature distribution based on their thickness.
Chapter 6. We discuss the conclusions of the study carried out and focus on the directions this work could take in the future.Universidad Pablo de Olavide de Sevilla. Departamento de Sistemas Físicos, Químicos y Naturale
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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