1,721,084 research outputs found
Microparticles based on water insoluble proteins for delivery of micronutrients in foods
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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
MINERALOGY AND PETROGRAPHY OF THE NW TINOS ISLAND OPHICALCITES, CYCLADES, GREECE.
No full textOphicalcites from Tinos Island, Cyclades, Greece,
better known as ‘green marble of Tinos’, comprise
polygenetic serpentinitic breccias with calcitic
matrix and numerous carbonate veins crosscutting
the formation. They have undergone intense
exploitation for building and decorative purposes
since ancient times. Serpentinitic clasts of the
ophicalcites are composed mainly of antigorite
and they show characteristic mesh textures, while
locally pseudomorphic and non-pseudomorphic
textures are developed. The carbonate phase
consists mostly of calcite, whereas dolomite
replaces calcite locally, especially along zones of
intense tectonic activity. Calcite, mostly as cement
material, presents a strong granoblastic texture
that bonds tightly the serpentinitic clasts. Chlorite
is present in many samples and seems to be a
quite common accessory mineral of the formation
whereas talc, spinel, hematite and magnetite can
also be found. Meter-sized bodies of chromitites
with irregular shapes were also observed in the
studied ophicalcites. They consist of aluminian
chromite, partially replaced by magnetite, Crchlorite,
calcite and base metal sulphides.
Mineralogical, textural and field relationships
data support the idea of a combined tectonichydrothermal
origin of these ophicalcites, while
sedimentary mechanisms have played a minor role
to their formation
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
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