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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
Petrogenesis of Eocene Agios Gregorious Plutonic complex (Mt. Athos, Greece): interplay between magma mixing, assimilation and fractional crystallization.
No full textThe Eocene Gregoriou Plutonic Complex (GPC) is located in the easternmost finger of the three-legged Chalkidiki Peninsula (northern
Greece), and intrudes the metamorphic basement of the Serbo-Macedonian Massif to the north, and the Circum Rhodope Belt
to the south. The intrusive rocks comprising the GPC are studied on the basis of their mineral chemistry, whole-rock major and trace
element geochemistry, and Sr and Nd isotopic composition. The rocks have been subdivided, on the basis of petrography, into a basic-
intermediate group bearing hornblende and biotite, with the basic rocks showing not strong evidence of cumulus, and an intermediate-
acid group bearing biotite only; common mineralogical assemblage is made up of quartz, perthitic orthoclase, plagioclase,
and allanite, epidote, titanite, apatite, and opaques as accessories. On the basis of geochemistry the most basic rocks are cumulates,
whereas the others are intermediate and acid in silica. Metamorphic xenoliths are very common, whereas magmatic enclaves are present,
yet not widespread, and strong field evidence of magma mixing are restricted to some areas. Some rocks of GPC are similar to
rocks of the Sithonia Plutonic Complex on the basis of elemental and isotopic composition.
Cumulitic samples show evidence of amp ± bt ± pl, although textural evidence of cumulus processes (e.g. layering) are scarce. A
filter pressing process that squeezed out some portions of the residual liquid determined the ‘cumulitic’ signature of some samples.
A process of Mixing plus Fractional Crystallization followed by an Assimilation plus Fractional Crystallization process is considered
responsible for the evolution of GPC. The first step explains the chemical variation in the less evolved intermediate rocks, whereas
the second step explains the geochemical variations of the remaining intermediate-acid rocks. The least evolved rock of GPC represents
the mafic end-member, whereas some leucogranites found in the Sithonia Plutonic Complex represent the acid end-member of
the first step. The average of less evolved intermediate-acid GPC rocks represents the parental magma of the AFC process, whereas
a mica gneiss, found in the basement of Sithonia Plutonic Complex, represents the contaminant.
Tectonomagmatic characterization of the GPC rocks indicates continental arc environment, and the mafic magma is presumably
the result of melting of a repeatedly metasomatized and enriched in LILE mantle. Accordingly, GPC magmatism is connected with
the subduction events, which affected the area since the Jurassic
Early Triassic Granitic Magmatism - Arnea and Kerkini Granitic Complexes - in the Vertiskos Unit (Serbo-Macedoniam Massif, Northeastern Greece) and its Significance in the Geodynamic Evolution of the Area
No full textThe Hellenides are an accretionary Alpine orogen, which is the result of the closure of Tethys and the subsequent accretion of terranes along the Eurasian margin. They are conventionally distinguished, from west to east, into External Hellenides and Internal Hellenides. The Serbo-Macedonian Massif belongs to the latter and is subdivided into two units: the Kerdyllia and Veriskos Unit in the eastern and central and northwest Chalkidiki Peninsula, respectively. The Vertiskos Unit mostly comprises various types of gneisses, associated with amphibolites and metasediments, and is intruded by mainly Mesozoic leucocratic granites and dykes. The largest magmatic bodies are the Arnea and Kerkini granitic complexes, which comprise two-mica syenogranites and alkali-feldspar granites containing quartz, K-feldspar, plagioclase, and biotite, often replaced by chlorite, and allanite, titanite, zircon, and fluorite, as typical accessory minerals. They are variably peraluminous with molar Al2O3/CaO+Na2O+K2O values of 0.96 - 1.34, and straddle the high-K calc-alkaline and shoshonite fields in the K2O vs. SiO2 diagram.
The Arnea and Kerkini rocks are studied using new U-Pb geochronological zircon data, as well as whole rock geochemical data, aiming at investigating the origin and evolution of the two complexes, and providing constraints on the relative geodynamic environment. Ages of Arnea and Kerkini complexes, obtained from zircon oscillatory rims and with excellent concordance, are at the boundary between Permian and Triassic, with Arnea complex showing differences in the rocks cropping out at South and North of Volvi Lake, 254 Ma and 244 Ma, respectively, and Kerkini having an age of 247 Ma. Both complexes evolve mainly by Fractional Crystallization, separating mineral assemblages consisting of feldspars and biotites, and allanite and zircon. Parental magmas are crustal melts derived by partial melting of TTG sources. Employing a statistical approach, using all the main features able to discriminate A-type granite igneous suites, all the rocks from Arnea and Kerkini complexes show variable behaviour: some parameters indicate a clear A-type affinity for both the complexes, but conversely other parameters indicate a clear differentiated I-type affinity. In addition all the rocks are A2 subtype, indicating that, more than connected to an intra-plate rifting, the magmatism is likely to be connected with a post-collisional environment.
At the boundary between Permian and Triassic the area was in an incipient rift environment, and as such oceanization had not still occurred, and the continental crust, accreted during a previous continental collision, is present at the rift floor. Such continental crust could melt partially to produce batches of magma similar to the studied magmatism. A submarine rhyolitic magmatism, outcropping on the floor of epicontinental sea and having similar age, exists and is geochemically similar to the granitic magmatism, indicating that the compositionally granitic melts produced by partial melting of the crust either remained at depth, generating the granitic complexes, or extruded as rhyolitic lavas.
We suggest that magmatism intruding Vertiskos unit emplaced in a post-orogenic environment following the subduction of Godwana under Eurasia during the first period of the extensional rifting leading to the opening of the Vardar-Meliata ocean
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
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