1,720,953 research outputs found
Validation expérimentale d'un modèle semi-empirique pour la prédiction de la résistance mécanique des remblais rocheux cimentés : Une nouvelle approche de contrôle qualité
Full text linkRésumé
Le domaine minier constitue un pilier essentiel pour l'économie de la province de Québec, contribuant de manière significative à son PIB. Cependant, cette industrie génère d'importantes quantités des déchets solides, notamment les roches stériles (RS) et les résidus miniers (RM), qui posent un défi environnemental notable. Pour résoudre cette problématique, une solution adoptée est la réutilisation de ces déchets comme matériaux de remblai, donnant naissance à différents types de remblais miniers, dont les remblais rocheux cimentés (RRC). Leur appréciation croissante dans l'industrie s'explique par leur robustesse et leur capacité à assurer la stabilité des sites miniers grâce à une résistance à la compression (UCS) élevée. Toutefois, l'application des RRC reste complexe en raison de la variabilité de leurs caractéristiques et de la complexité liée à leur préparation, sans compter l'absence de méthodes de conception standardisées.
Cette recherche vise à mettre au point une méthode de contrôle qualité technique pour les mélanges de RRC, s'appuyant sur une évaluation précise de leur résistance mécanique. L'étude s'articule autour de l'utilisation d'un modèle semi-empirique existant, conçu pour estimer l'UCS des RRC à partir des propriétés de leurs composants. La phase suivante de la recherche consiste en la validation et le calibrage de ce modèle grâce à l'analyse de données existantes et à l'expérimentation de nouvelles compositions en laboratoire. Cette étape cruciale conduit au développement d'une application dédiée à la prédiction des constantes spécifiques au type de ciment utilisé, facilitant ainsi l'adoption du modèle semi-empirique à large échelle. En complément, l'étude développe une procédure de contrôle qualité pour les mélanges de RRC. Cette démarche inclut la collecte et l'analyse des miettes d'éprouvettes pour déterminer leur teneur en eau gravimétrique, un paramètre déterminant pour évaluer divers indicateurs de qualité tels que la densité humide et sèche, ainsi que le taux de porosité des remblais.
Les résultats obtenus montrent l'efficacité du modèle semi-empirique dans la prédiction de l'UCS des RRC, avec des coefficients de corrélation proches de 1, démontrant la robustesse et la fiabilité du modèle semi empirique étudié. En conclusion, cette recherche souligne l'importance de surveiller attentivement les caractéristiques géotechniques et de choisir avec soin les composants des remblais pour garantir non seulement leur performance mais également leur durabilité et leur stabilité environnementale.
Abstract
The mining sector is a crucial pillar for the economy of the province of Quebec, significantly contributing to its GDP. However, this industry generates substantial amounts of solid waste, particularly waste rocks (RS) and mining residues (RM), posing a significant environmental challenge. To address this issue, a solution has been adopted involving the reuse of these wastes as backfill materials, leading to various types of conventional mining backfills, including Cemented Rockfills (CRF). Their growing appreciation in the industry is due to their robustness and their ability to ensure the stability of mining sites through high uniaxial compressive strength (UCS). Nevertheless, the application of CRF remains complex due to the variability of their characteristics and the complexity associated with their preparation, not to mention the absence of standardized design methods.
This research aims to develop a technical quality control method for CRF mixtures, based on an accurate evaluation of their mechanical resistance. The study focuses on the use of an existing semi-empirical model, designed to estimate the UCS of CRF based on the properties of its components. The first phase of the research involves validating and calibrating this model through the analysis of existing data and experimentation with new mixtures in the laboratory. This crucial step leads to the development of an application dedicated to predicting constants specific to the type of cement used, thus facilitating the adoption of the semi-empirical model on a large scale. Additionally, the study develops a quality control procedure for CRF mixtures. This approach includes the collection and analysis of specimen crumbs to determine their gravimetric water content, a crucial parameter for evaluating various quality indicators such as wet and dry density, as well as the porosity rate of the backfills.
The results obtained demonstrate the effectiveness of the semi-empirical model in predicting the UCS of CRF, with correlation coefficients close to 1, showcasing the robustness and reliability of the studied semi-empirical model. In conclusion, this research highlights the importance of closely monitoring geotechnical characteristics and carefully selecting the components of backfills to ensure not only their performance but also their durability and environmental stability
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
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
- …
