1,720,953 research outputs found
Mineralogy and Geochemistry of a Lithium and Boron Enriched Stratiform Ore Zone in the Cave Spring Formation, Rhyolite Ridge, NV, USA
No full textThe Rhyolite Ridge Project in the Silver Peak Range contains lithium and boron mineralization hosted by late Miocene-early Pliocene strata-bound sediments in an intermontane valley. ioneer USA Corporation is developing this project and is the industry-sponsor for this research along with the USGS and CREG. A lacustrine section, the Cave Spring Formation, measures up to 1,500 feet thick and hosts the sediments of interest. The unit with economic potential is the middle unit: a 60-foot interval called the Searlesite layer (B5). It is mineralized with both lithium clays and boron and is the targeted ore zone and the focus of this research. The younger, marl-rich member of this unit, the Li-Marl layer, shows no searlesite but has higher concentrations of lithium, which is hosted in smectite-rich interbeds.This research tests the hypothesis that precipitation of the Searlesite and Li-Marl layers of the Cave Spring Formation fits within the framework of the Closed Hydrologic System Diagenesis (CHSD) Model: these pelitic sediments required a saline alkaline lake with inputs of tuffaceous material to create the favorable chemistry for diagenesis of volcanic glass and subsequent precipitation of clays, zeolites, searlesite, and K-feldspar. This diagenetic alteration sequence shows a progression towards altered mineral assemblages observed in the Searlesite layer, where Li concentration in clay positively correlates with the degree of smectite-illite transformation and searlesite precipitation.Detailed mineralogical and geochemical analysis of 17 samples across the Li-Marl and Searlesite layers distinguishes the two layers and provides insight into the depositional environment of the ore zone and the evolution of the pore water during deposition of the younger material. The abrupt change in geochemistry between these layers is striking, and the genetic relationship between the mineralogy and the economic value of the sediments is directly related to the paleo lake conditions. The CHSD model states that rocks in deeper alkaline lakes with density-driven circulation will show more illitization of smectite and more authigenic K-feldspar than those in shallower waters or near basin margins; dense, diagenetic fluids will concentrate in basin-lows, driving precipitation these alteration products. Illite has been demonstrated to be more favorable in processing for lithium due to its lack of swelling characteristics while also being observed to concentrate lithium more effectively. The Searlesite layer exhibits characteristics of a deeper lake with a mineral assemblage reflecting the more highly progressed alteration sequence described in the CHSD model, including mixed-layer illite-smectite clays. The overlying Li-Marl layer is primarily characterized by a minimally altered mineral assemblage reflecting a shallower lake, including a dominant proportion of neoformed Mg-smectite clays.Seventeen samples from one core hole �" SBH-086 �" characterize the lacustrine sediments of the Li-Marl and Searlesite layers of the Cave Spring Formation. The minerals identified include carbonates such as calcite, dolomite and strontianite; searlesite; celadonite mica;zeolites such as analcime, heulandite and phillipsite; and Li-bearing clays that form as Mg-smectite or disordered I/S mixed-layer clays �" interpreted to be composed of Mg-smectite resembling hectorite and Al-illite. The highly mineralized Searlesite layer represents the most diagenetically altered material and the mineral suite in the Searlesite layer is the result of this diagenesis in the presence of boron. X-ray diffraction techniques are employed to interpret mineralogy in the fine-grained sediments, and geochemical analysis and modeling determined the clay structural formulas of the clays. These data enhance understanding of the Rhyolite Ridge deposit and the conceptual deposit model, which could prove useful for additional discovery of analogous deposits in other locations. Additionally, recovery and processing of the ore may be enhanced by quantifying variation in grade as a function of clay and borate mineralogy, as well as cation ratios of important elements
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
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