1,720,994 research outputs found
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
Pre-Triassic history recorded in the Calabria-Peloritani segment of the Alpine chain, southern Italy. An overview.
No full text— Clockwise P-T-(t) trajectories are generally recorded in the pre-Triassic basement rocks of the Calabria-Peloritani segment of the Alpine chain. Geochronological data point to a synchronism of T-peak and emplacement of huge masses of granitoids at about 300 Ma. Decompression and heat supply from the granitic intrusions mark the transition from Barrovian to low P/high T metamorphism. When the preserved characters
allow to trace prograde trajectories, a strong Pincrease and a moderate T increase, sometimes with T peak delayed relatively to the P peak. These features are consistent with orogenic evolution in which crustal thickening in early-middle-Hercynian contractional stages was followed by crustal thinning in late-Hercynian extensional stages. Moreover, in the Calabria-Peloritani segment of the Alpine chain, pre-Hercynian metamorphic and magmatic evidence also occurs
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
Tolerance of Carp (Cyprinus carpio) and Black Bullhead (Ictalurus melas) to gas supersaturated water under Lotic and Lentic conditions.
No full textDyke magmatism in the Sila Massif (Calabria, southern Italy): witness of Early Permian exhumation
No full textIn the Sila Massif the end of the Hercynian orogeny is marked by widespread dyke magmatism. Unfortunately, little is kmown about serial affinity, age and tectonic framework of this magmatic event. The research proposed here aims to close this knowledge gap, with the main goal of reconstructing the tectonic context favouring magma dyke ascent and emplacement. during the waning stages of the Hercynian cycle. To reach these objectives, new structural, petrological, geochemical and geochronological data have been collected.
In the Sila Massif a late-Hercynian Batholith crops out. It is mainly made up of granodiorites and tonalites, but includes also peraluminous granites and mafic bodies such as gabbros and diorites. Intrusive rocks emplaced between 300 and 304 Ma. At the southwest the Sila Batholith is bordered by medium- to high-grade metamorphic rocks mainly represented by migmatitic paragneisses. Dykes transect essentially intrusive rocks but can be also found in the metamorphic basement.
The studied dykes display a wide compositional range from rhyolite to basaltic andesite. Texture is commonly porphyritic, but in some instances can be equigranular. They crosscut intrusive contacts between magmatic intrusive rocks and metamorphic wall rocks.
A database of orientation and geometrical features has been prepared with new and literature field data for a considerable number of dykes (n = 350). At the outcrop scale dykes mostly show sub-planar and sub-vertical sharp walls. Map view suggests that most dykes have a nearly tabular shape that sometimes can be undulated. Thickness ranges from 1-2 m to 50 m, whereas length spans from ≈ 50 m to 2 km.
Rose diagrams indicate a strong preferred orientation of dykes along a E-W strike. Other significant groups are orientated along ESE-WNW, NW-SE, NNW-SSE and ENE-WSW directions.
Sills are represented by two sub-horizontal sheeted bodies of microgranite having an elliptical shape with maximum and minimum axes of 1.5 km and 0.8 km, respectively. Their maximum thickness is of ≈ 35-40 m.
Petrological and geochemical analyses were performed to define magmatic affinity and level of emplacement of the dykes. Chemical features indicate that, in comparison to host calc-alkaline granitoids, dyke magmatism drifts to towards an alkali calcic serial affinity, characterized by a moderately high Na2O content, consistent with late- to post-orogenic timing.
Level of emplacement is shallow since magma quenching textures are quite common. They are represented by alkali-feldspar spherulites in felsic types and by acicular hornblende nucleated around quartz, rounded xenocrysts in mafic types. A quantitative estimate of the emplacement level was obtained by Al-in-hornblende barometry for basaltic andesite dyke (z ≈ 7 km). The same method was adopted to define depth of emplacement of the granodiorite wall rock (z ≈ 12 km).
Geocrhonological analysis was performed for selected dykes and granodiorite wall rock. To this purpose, euhedral and elongated zircons were dated by U-Pb method (LA-ICP-MS). Preliminary results indicate that dyke magmatism took place at ≈ 280 Ma and post-dated emplacement of late-Hercynian granodiorite of ≈ 20 Ma.
Integrating data on time and level of emplacement, both for dykes and granodiorite, it is possible to evaluate an average exhumation rate of the Calabria contine..
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
- …
