1,720,964 research outputs found
Subduction-unrelated magmatism of southern periphery of Paleotethys: constraints from Late Paleozoic magmatism from the south of Masuleh, western Alborz
No full textThe Alborz Mountains in north of Iran correlates with the Paleotethyan Suture so preserves valuable clues for geodynamic clarifications and paleotectonic reconstructions. During life span of Paleotethys from Early Paleozoic to Late Triassic, major parts of Alborz appear as a continental margin in southern border of the oceanic basin. To test paleotectonic setting of Alborz during Late Paleozoic and its passive or active condition, geochemical data of magmatic rocks can provide useful clues. The Masuleh area (western Alborz) involves important exposures of Late Paleozoic volcanic associations. These volcanics are poorly studied and understood, so we intend to present new geochemical data about them. Field studies characterize various lithological units in tectonic and stratigraphic contact with volcanic units including Late Paleozoic low-grade metamorphics (slate-phyllite) and calcareous units of upper Devonian, Carboniferous to Permian. The whole rock geochemical data has been obtained by XRF and ICP-MS at Ferrara University, Italy. The volcanics mainly comprise basaltic to trachy-basaltic compositions. They show moderate to high alteration reflected in their LOI content (2.2 to 7.8 wt.%). Thus, for major element we used recalculated anhydrous values. The SiO2 abundances of 45.3 to 50.7 wt.% display basic nature of the studied rocks. Other major element components such as TiO2, Al2O3, CaO and MgO are in the ranges of 1-4.4, 13.7-18.3, 5-10.7 and 2.5-14.9 wt.%, respectively. Moreover, Mg# [MgO*100/(MgO+FeO*)] varies from 19-71. Wide range of major element variations likely corresponds to different modal mineralogy and also various extent of melt evolution and fractionation processes. Total alkali element abundance (Na2O+K2O) displays elevated values (1.95-7.9 wt.%) reflecting alkaline composition of the samples. Compatible elements such as Ni (2.2-213.7 ppm) and Cr (17-739 ppm) indicate highly varied amounts, as well, suggesting nearly primitive to extremely fractionated nature. In La/Sm vs. La plot, the compositional trend is consistent with fractional crystallization process. Chondrite-normalized REE patterns and primitive mantle -normalized spider diagrams are characterized by similar patterns suggesting genetic relationships of different samples. The spider diagrams display humped-shaped patterns in which the LILEs (Rb, Ba, Sr and K) and HFSEs (e.g. Th, Ta, Nb, Zr and REEs) show enrichment with increasing incompatibility and a slightly negative Nb anomaly. These patterns are consistent with typical intraplate alkaline magmatism (OIBs). REE patterns are characterized by pronounced negative slope reflecting high LREE/HREE enrichment ((La/Yb) N= 5-17). Moreover, La and Yb represent enrichment of 47-248 and 6.5-22 times chondrite abundances, respectively. Immobile trace elements (e.g. La, Y, Zr and Nb) discrimination diagrams suggest subduction unrelated within-plate mantle origin similar to OIB source. Furthermore, the mantle source nature and partial melting degrees are inferred from modeling based on incompatible element ratios (Sm/Yb vs. La/Yb plot) suggesting that parental melt derived from garnet-bearing lherzolite and partial melting of <15%. Finally, we conclude that the area located to the southern margin of Paleotethys during Late Paleozoic was a passive margin (Gondwanian affinity) and the magmatic activity was related to thermal perturbation of mantle via hot spot/plume effects in an extensional tectonic regime
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
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