1,720,963 research outputs found
Mineralogy, petrography and evolution of Triassic magmatites of the Cima Pape Complex, eastern Dolomites
No full textMiddle Triassic magmatic products in the Cima Pape area (Eastern Dolomites) are examined. Stratigraphically the volcanic rocks are placed between the Livinallongo formation and the "Conglomerato della Marmolada' formation. The succession starts with the "agglomerati' (a tabular sheet of chaotic deposits derived from submarine slidings) followed by pillow lavas, pillow breccias and small subvolcanic bodies. A thick hyaloclastite sequence marks the end of volcanic activity. A sill varying in thickness from 50 to 300 m is injected inside the Livinallongo formation and controls the distribution of the overlying volcanics. The sill has undergone important differentiation. The chemical characteristics of the volcanic rocks show a clear affinity with shoshonitic series. The rocks could be derived from high alumina basalt primary magmas by high-pressure fractional crystallisation near the base of a thick crust. The "Conglomerato della Marmolada' is a thick conglomeratic sequence made almost exclusively of volcanic elements. This formation marks the end of an upper-Ladinian tectonic phase with extensive uplifting, faulting and erosions. -from English summar
Fe-Mn carbonate concretions in the Reno-Limentra fluvial deposits near Vergato (Bologna province, Northern Apennines): A petrographic and geochemical study
No full textFerromanganese carbonate concretions of extremely variable compositions mineralogical, petrographic and geochemical features. The obtained results lead to a genetic model by which concretions appear to be diagenetic rather than hydrogenic or hydrothermal. This origin is particularly supported by trace metal concentrations, REE patterns and stable isotope compositions
Monte Cavaloro: Small differences in outcrop lithology (Fe-Ti-P diorite) of a complex olistolith (Apennines Bologna)
No full textAt Monte Cavaloro near Bologna, outcrops a small olistolith of the ophiolite sequences of the Northern Apeninnes. This small outcrop is known in the geological literature as Bombicci (1868) find out a new type of rock which he named "oligoclasite". Cappellini (1878) studying the same outcrop, named the rock "Cavalorite". These two terms are still present (although obsclete) in the geological nomenclature. The same outcrop was studied by various authors which gave contrasting description of the mineralogy and recognized different rock types, from oligoclase bearing gabbro to quartzdiorite. The last study was by Gazzi (1961) who recognized the presence of stilpnomelane and classified the rock as stilpnomelane-oligoclase bearing gabbro. The present work lead us to the finding of several litothypes in the Monte Cavaloro olistolith: Fe-gabbros, Fe-gabbrobrodiorites, Fe-Ti-P diorites, Fe-Ti-P meladiorites, quartzdiorites and amphibole bearing albitite dikes. The Fe-Ti-P diorites are made up by oligoclase, ferroaugite, ferrohortonolite, ferrosilite, apatite, titanomagnetite and Fe-edenite and appear to be the product of cumulus processes from Fe-rich andesitic magmas which concentrate Fe-Ti oxides when apatite appeared as a liquidus phase. The other associated rocks are genetically linked through flow differentiation processes which generated the Fe-Ti-P meladiorites and the zircon rich quartzdiorites. The differentiation processes, took place in a closed system under low oxygen fugacity; during the late magmatic stages the high volatile content promoted the formation of hydrous minerals (mainly amphiboles) and the peculiar association biotite, cummingtonite-grunerite, stilpnomelane, chlorite. Stilpnomelane is variable in composition and in spite of its chemical features, it may correspond to that find in late stage granophyre of the Skaergaard pluton. This fact is a clear indication of the highly evoluted nature of our stilpnomelane bearing rock in keeping with the presence of stilpnomelane relics in the quartzdiorites. REE and trace elements abundances and composition of apatites and titano-magnetites agree with this genetic interpretation. Liquid immiscibility, as responsible of Fe-Ti-P rock, would seem to be not a viable genetic mechanism. The amphibole bearing albitite dikes represent a late injection of a slightly evolved gabbric magma
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
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