1,720,953 research outputs found
Evaluación del método CDA para el análisis de rotura de presas de relaves y su aplicación en una presa de Ancash - Perú
No full textEl presente trabajo de investigación desarrolla una evaluación de la confiabilidad de la metodología propuesta por la Asociación Canadiense de Presas (CDA, por sus siglas en inglés) para la elaboración del análisis de rotura de presas de relaves con respecto a otras metodologías aplicadas en el Perú.
Para el desarrollo del análisis de rotura de presas de relaves considerando la metodología propuesta por la CDA, se siguieron los once (11) pasos que se desarrollan detalladamente en su “Boletín Técnico: Análisis de Rotura de Presas de Relaves”.
Para el desarrollo del análisis de rotura de presas de relaves considerando una metodología convencional usada en el país, se recurrió a la búsqueda de artículos científicos nacionales e internacionales; sin embargo, estos no se encuentran agrupados dentro un marco metodológico propiamente dicho. En ese sentido, Quisca (2016) elaboró un análisis de rotura de presa el cual fue expuesto en el XXVII Congreso Latinoamericano de Hidráulica realizado en el Perú y cuyo proceso metodológico para la elaboración del análisis de rotura de presa fue adoptado por el Comité Peruano de Grandes Presas (COPEGP) en el año 2018.
Las principales herramientas utilizadas para el desarrollo del modelamiento y el proceso de registro de información a través de mapas de inundación fueron el HEC – RAS en su versión 6.2 y QGIS en su versión 3.28, respectivamente. Estas herramientas permitieron la realización del modelamiento de flujos Newtonianos e hiperconcentrados (o flujos No – Newtonianos como lo describimos en el presente estudio) y la visualización de los resultados en mapas con información georreferenciada.
El caso de estudio corresponde a una presa de relaves localizada en la provincia de Huari, departamento de Ancash del Perú a una altitud promedio de 4280 m.s.n.m. El eje de la presa del depósito de relaves se encuentra en las siguientes coordenadas: (N1:8944786.17, E1:279274.59 y N2:8944886.99, E2:279561.89). Además, se realizaron descripciones geomorfológicas, hidrográficas, meteorológicas y del uso del suelo del caso de estudio, que fueron necesarias al momento del desarrollo del análisis de rotura de presa de relaves.
Finalmente, luego del desarrollo y ejecución de ambas metodologías, así como también de la discusión de los resultados obtenidos, se concluyó que la aplicación de la metodología propuesta por la CDA permite definir mayores áreas afectadas debido a la liberación de relaves por rotura de presa con respecto a métodos convencionales.
Este resultado marca el inicio de una línea de investigación con respecto al análisis de rotura de presas de relaves en el país, ya que constantemente se viene realizando nuevos estudios, actualizaciones y hallazgos lo que dará paso a nuevos retos y sobre todo, un mejor y adecuado enfoque concerniente al tema de seguridad de presas de relaves.The present research work develops an evaluation of the reliability of the methodology proposed by the Canadian Dam Association (CDA) for the preparation of the tailings dam breakage analysis with respect to other methodologies applied in Peru.
For the development of the tailings dam failure analysis considering the methodology proposed by the CDA, the eleven (11) steps that are developed in detail in its “Technical Bulletin: Tailings Dam Failure Analysis” were followed.
To develop the analysis of tailings dam failure considering a conventional methodology used in the country, a search for national and international scientific articles was used; However, these are not grouped within a methodological framework itself. In that sense, Quisca (2016) developed a dam breakage analysis which was presented at the XXVII Latin American Hydraulics Congress held in Peru and whose methodological process for preparing the dam breakage analysis was adopted by the Peruvian Committee of Large Dams (COPEGP) in 2018.
The main tools used for the development of modeling and the process of recording information through flood maps were HEC – RAS in version 6.2 and QGIS in version 3.28, respectively. These tools allowed the modeling of Newtonian and hyperconcentrated flows (or Non–Newtonian flows as we describe in the present study) and the visualization of the results on maps with georeferenced information.
The case study corresponds to a tailings dam located in the province of Huari, department of Ancash of Peru at an average altitude of 4280 m.a.s.l. The axis of the tailings deposit dam is located at the following coordinates: (N1:8944786.17, E1:279274.59 and N2:8944886.99, E2:279561.89). In addition, geomorphological, hydrographic, meteorological and land use descriptions of the case study were made, which were necessary at the time of developing the tailings dam failure analysis.
Finally, after the development and execution of both methodologies, as well as the discussion of the results obtained, it was concluded that the application of the methodology proposed by the CDA allows defining larger areas affected by the release of tailings due to dam failure with compared to conventional methods.
This result marks the beginning of a line of research regarding the analysis of tailings dam failure in the country, since new studies, updates and findings are constantly being carried out, which will give way to new challenges and, above all, a better and adequate approach concerning the issue of tailings dam safety.Tesi
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
- …
