1,721,030 research outputs found
Fassinaite, Pb(2)(2+)(S(2)O(3))(CO(3)), the first mineral with coexisting thiosulphate and carbonate groups: description and crystal structure
No full textFassinaite, Pb2(CO3)(S2O3), the first mineral with coexisting carbonate and thiosulfate groups from Trentini mine, Vicenza, Italy.
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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
Cosmetics and Cosmetology at Shahr-I Sokhta
No full textA set of X-rays Diffraction and SEM investigations of the contents of thirteen stone flagons at Shahr-i Sokhta (Sistan, Iran, third millennium BC) demonstrates that they held cosmetic substances. A surprisingly varied list of mixtures of mineral phases (natural and possibly synthetic) indicates the use of green, blue, and white pigments. After discussing the typology of the stone flagons, their geographical distribution and morphological changes in time, we show how cosmetic ingredients were moved and mixed from a specific type of elongated vial to miniature vessels and/or finally, before application, to a stone perforated cap, previously interpreted as a “lid” or “spindle whorl”. Bird feathers were probably drawn through these perforated caps holding cosmetic powders to apply the substances to the skin. The economic implications of the cosmetology of Shahr-i Sokhta are briefly outlined in the Conclusion
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
Episyenites within the Tauern Window metagranitoids: unpredictable?
Full text linkThe core of the Tauern tectonic window (Eastern Alps) consists of dominant pre-Alpine granitoids (∼ 295 Ma)\ud
that were metamorphosed and deformed during the Alpine orogenesis (at ∼ 30 Ma). Ductile deformation at peak conditions (550-600 ̊C and 0.5-0.7 GPa) was followed by cataclastic faulting (Pennacchioni and Mancktelow, 2007). Both deformation phases occurred in a fluid-rich environment with formation of veins filled with quartz-calcite-biotite-feldspar and quartz-chlorite-epidote-adularia-calcite, respectively. Faults are typically low displacement strike-slip structures (offset < 1m) organized in en-echelon arrays at different scales with a stepping geometry consistent with the sense of fault slip (e.g. left-stepping for dextral slip). Fault stepovers include pervasive fracturing dominated by a set of antithetic faults (Pennacchioni and Mancktelow, 2013). These faults were locally exploited by episyenitic alteration which represented the "last" event of fluid-rock interaction in the Tauern meta-granitoids. Episyenites within metagranodiorites have a macroscopic porosity in the range between 25 and 35% volume (determined by microtomography), mostly derived from dissolution of multi-mm-sized quartz. Recent glacier-polished outcrops provide a unique opportunity to investigate the relationships between episyenites and overprinted faults. Detailed field mapping of a selected outcrop indicates that episyenites: (i) are spatially linked to precursor faults and statically overprinted all previous structures; (ii) occur discontinuously along faults; (iii) have a thickness (of as much as a few meters) that does not correlate with either the amount of fault slip or the density of the fracture network; (iv) developed independently of rock type (passing "undisturbed" lithologic boundaries with conspicuous variations of quartz grain size of the protolith lithology). Although the faults in the studied outcrop are extensively decorated by relatively large volumes of episyenite, occurrences of episyenite in the Tauern granitoids are generally rare. This study indicates that there is not a simple way to predict the location and the extent of episyenite alteration from the geometry and fracturing patterns of the network of precursor cataclastic faults.\ud
The dominant quartz dissolution during episyenitization was accompanied and/or followed by: (i) pervasive substitution of oligoclase and chlorite/biotite of the metagranodiorite by albite and clay-minerals, respectively, and (ii) limited precipitation of new adularia, anatase, calcite, hematite and zeolite within pores. Isotopic data from calcite filling the episyenite porosity suggest a meteoric source of the fluids (δ18 O (SMOW) ≈ -2 per mil). In contrast, fluids synkinematic with previous episodes of fluid-rock interaction during faulting and ductile shearing had a deeper origin (δ18O (SMOW) ≈ 8-9 per mil).\ud
References\ud
Pennacchioni, G., Mancktelow, N.S., 2007. J. Struct. Geol. 29, 1757-1780.\ud
Pennacchioni, G., Mancktelow, N.S., 2013. Geol. Soc. Am. Bull. 125, 1468-1483
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
sj-pdf-1-dcm-10.1177_17504813231185861 – Supplemental material for Public communication of technoscience in the news: A cross-linguistic Multidimensional analysis of English and Italian newspapers
No full textSupplemental material, sj-pdf-1-dcm-10.1177_17504813231185861 for Public communication of technoscience in the news: A cross-linguistic Multidimensional analysis of English and Italian newspapers by Virginia Zorzi, Federico Neresini and Alberto Cammozzo in Discourse & Communication</p
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