1,721,019 research outputs found
ALUNITE OCCURRENCES IN GREECE: GEOLOGICAL MINERALOGICAL CONSTRAINTS AND EXPLOITATION
No full textIn this article, occurrences of alunite in northern Greece (Thrace) and the Aegean Islands (Lesvos, Limnos and Milos) are presented and their geological, mineralogical and depositional characteristics are discussed. All alunite-bearing rocks are part of advanced argillic alteration zones in porphyry-epithermal systems hosted in Neogene magmatic rocks. Evidence for early exploitation of alunite in Sapes, Lesvos and Milos, suggest various uses, especially in medicine, in fabric dying, purification of water, or as pigment from classical until recent times
Historical faulting in Aghios Konstantinos area (central Greece), based on archaeological indications
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Tellurides and bismuth sulfosalts in gold occurrences of Greece: mineralogical and genetic considerations
Full text linkPre-Tertiary to Tertiary gold deposits in Greece occur in a wide range of genetic types including volcanic massive sulfides, orogenic, intrusion-hosted, skarn, manto-, porphyry- and epithermal-type ores. Almost all of the gold mineralization hosts various Bi-tellurides and Bi-sulfosalts, which in addition to Au-Ag-tellurides, are indicators of specific physicochemical conditions of ore formation. The Bi-bearing mineralization can be subdivided into three groups regarding their spatial relationship to gold: (a) mineralization which lacks tellurides but includes Bi-sulfosalts and native gold, (b) mineralization where Bi-tellurides of the reduced-type (joseite-A, joseite-B, pilsenite) accompany Bi-sulfosalts, native bismuth and native gold, (c) deposits/prospects where Au-Ag-tellurides are abundant and Bi-tellurides and Bi-sulfosalts are absent. Bi-telluride and -sulfosalt mineralization in Greece underwent several stages of remobilization during successive accretionary episodes in active continental margins and arc terranes during the Carboniferous to Pleistocene.This proceeding is published as Voudouris, P., Spry, P.G., Melfos, V., and Alfieris, D., 2007, Tellurides and bismuth sulfosalts in gold occurrences of Greece: mineralogy and genetic considerations, in Kojonen, K. K., Cook, N.J., and V.J. Ojala (eds.), Au-Ag-Te-Se deposits, Proceedings of the 2007 Field Workshop (Espoo, Finland, August 26-31, 2007). Geological Survey of Finland Guidebook 53, p. 85-94.</p
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
Fluid inclusion and stable isotope characteristics of carbonate replacement Pb-Zn-Ag deposits in the Lavrion district, Greece
Full text linkCarbonate replacement Pb-Zn-Ag deposits (CRDs) in the Lavrion district are spatially related to an Upper Miocene granodiorite intrusion and various sills and dikes of intermediate to acid composition. The mjneralogy of CRDs includes base-metal sulphides as well as sulphosalts containing Ag, Bi, Sn, Sb, As, and Pb, particularly at Plaka and Kamariza. Fluid inclusion studies suggest the CRDs were deposited from moderate-temperature {132°-365°C), CO2-poor, and low- to moderately-saline (I to 20 wt% NaCl equivalent) fluids. Sulphur isotope compositions of sulphides and sulphates suggest a magmatic contribution to the ore fluids and a marine seawater origin for barite. Carbon and oxygen isotope compositions of calcite intergrown with sulphides reflect variable exchange of the ore-bearing fluid with the upper and lower marble host and with proximity to the Plaka granodiorite. The CRDs resemble carbonate-hosted sulphide deposits in Mexico, central Colorado, and northern Greece.This proceeding is published as Bonsall, T.A., Spry, P.G., Voudouris, P., St. Seymour, K., Tombros, S., and Melfos, V., Fluid inclusion and stable isotope characteristics of carbonate replacement Pb-Zn-Ag deposits in the Lavrion district, Greece, in Andrews, C.J., et al., (eds.), Digging deeper: proceedings of the Ninth Biennial Meeting of the Society for Geology Applied to Mineral Deposits: Dublin, Ireland 20th- 23rd August, p. 283-286. Irish Association for Economic Geology 2007. Posted with permission.</p
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