1,720,956 research outputs found
Supplementary files for thesis: Petrogenesis of mantle-hosted granitoids from the Samail ophiolite
No full textSupplementary Files for PhD thesis 'Petrogenesis of mantle-hosted granitoids from the Samail ophiolite', including new and compiled whole-rock geochemistry, stable and radiogenic isotopes
Variações no regime de deformação de uma crosta orogênica quente: análise estrutural e de fábrica magnética na Faixa Araçuaí (Sudeste to Brasil)
No full textThe Neoproterozoic Araçuaí belt of East Brazil formed during the amalgamation of Western Gondwana and holds characteristics of a hot collisional belt, involving large amount of magma, partial melting of the middle crust, and slow cooling rates. This work combines structural analysis, magnetic fabric, and geochronological studies in order to access information related to the flow of rocks, deformation history, and structural patterns associated with the behavior of this orogenic setting. Microstructural observations support that deformation of the plutonic bodies occurred in the magmatic state while the host metasedimentary and basement rocks remained in the solid-state. A detailed structural mapping integrating field and anisotropy of magnetic susceptibility (AMS) revealed four domains with contrasting flow patterns. The structural patterns from W to E are characterized by: westward thrusting orthogonal to the belt (region 1), orogen-parallel tranpression induced strain partitioning (regions 2 and 3), and orogen-parallel flow and subsidiary eastward vergence magmatic flow (region 4). Anisotropy of anhysteretic remanent magnetization (AARM) and magnetic mineralogy investigations suggest that the main carriers of the AMS are biotite and/or amphibole in paramagnetic samples (host metassediments and basement unit), and multi-domain (MD) or pseudo-single domain (PSD) magnetite grains in ferromagnetic materials (hosted in plutonic bodies). U-Pb dating of zircons from granitoids in the western arc border and central arc regions (structural regions 1, 2, and 3) reveal that magmatism occurred between 615-567 Ma. Microstructural investigations in the igneous bodies suggest that deformation occurred before complete solidification. This magmatism is associated with the main tectono-metamorphic peak attained by the orogen. To the east (structural region 4), younger bodies were emplaced in a still thermally buffered environment, but after solidification of the anatectic country rock. This late magmatism (540-480 Ma) is associated with a minor tectono-metamorphic peak, and magmatic deformation affected these bodies during that time. In the context of protracted deformation under slow cooling conditions, the composite observed fabric results from the interplay of collision-driven (thrusting and transpression strain partitioning) and gravity-driven (orogen-parallel flow) deformations, induced by the East-West convergence between the São Francisco and Congo CratonsA Faixa Araçuaí formada no Neoproterozóico durante a aglutinação do Gondwana Ocidental possui características de um cinturão colisional -quente?, envolvendo amplo magmatismo, fusão parcial da crosta média e baixas taxas de resfriamento. Este trabalho combina estudo estrutural, magnético e geocronológico para acessar informações relacionadas ao fluxo das rochas, histórico de deformação e padrões estruturais associados ao comportamento desse orógeno. Observações microestruturais sustentam que a deformação dos corpos plutônicos ocorreu no estado magmático; enquanto as rochas metassedimentares e do embasamento no estado sólido. Mapeamento estrutural detalhado integrando medidas obtidas em campo e através de anisotropia de susceptibilidade magnética (ASM) revelou quatro domínios com padrões de distribuição da deformação contrastantes. Os padrões estruturais de W a E são caracterizados por: esforços contracionais para oeste com orientação ~NS (perpendicular à estruturação do orógeno) (região 1), partição de deformação induzida por transpressão paralela à faixa orogênica (regiões 2 e 3) e fluxo magmático horizontal e de vergência para leste (região 4 ). Anisotropia anisterética de remanência magmética (AARM) e investigações de mineralogia magnética sugerem que os principais carreadores da ASM são biotita e / ou anfibólio em amostras paramagnéticas (metassedimentos do hospedeiro e unidade do embasamento), e grãos de magnetita multi-domínio (MD) ou pseudo-domínio simples (PSD) em materiais ferromagnéticos (corpos magmáticos). Datações U-Pb de zircões de granitóides nas regiões de oeste e central do arco magmátio na área de estudo (regiões estruturais 1, 2 e 3) revelam que o magmatismo ocorreu entre 615-567 Ma, e a deformação ocorreu antes da cristalização. Este magmatismo está associado ao principal pico tectono-metamórfico atingido pelo orógeno. Para o leste (região estrutural 4), os corpos mais jovens foram intrudidos ainda em condições de temperatura elevada, mas após a solidificação da rocha hospedeira. Este magmatismo tardio (540-480 Ma) está associado a um pico tectono-metamórfico menor, e a deformação magmática afetou esses corpos durante este período. Nesse contexto de deformação prolongada sob condições de resfriamento lentas, as contrastantes fábricas observadas resultam da interação de deformações acionadas por colisão (partição da deformação por esforços contracionais e transpressionais) e por gravidade (fluxo orogênico paralelo) induzidas pela convergência Leste-Oeste entre os crátons São Francisco e Congo
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
- …
