1,720,997 research outputs found
Glaucony-bearing horizons from shallow-marine siliciclastic deposits of the northern margin of Africa: a case study from the Oligo-Miocene of northern Tunisia
No full textIn spite of our rather comprehensive knowledge on the glauconitic minerals as a reliable tool for basin analysis, we have almost no data from the northern margin of the African continent. Oligo-Miocene shallow-marine deposits are widely exposed in northern, northeastern and central Tunisia. Particularly, northern Tunisian outcrops host numerous glaucony-rich strata, which are superbly exposed at many localities and provide good sites for the study of the green grains. Sedimentological data indicate that the Oligocene glaucony-bearing strata cropping out at Jebel Harb and Jebel Hajra Touila were deposited in shallow-water and shelf environments, respectively, whereas Miocene deposits at Jebel Ben Amara and Gorge de Kasseb are of shelfal and shoreface origin, respectively.
Geochemical analyses of nine glaucony samples show that Oligocene glaucony is invariably more evolved (K2O = 6-8%) than its Miocene counterpart, which is typically slightly evolved (K2O = 4-6%). Vertical changes in glaucony maturity are consistent with the sequence-stratigraphic interpretation, showing in general an upward increase in the transgressive systems tract. Maximum glaucony concentration is recorded in correspondence of the maximum flooding surface/condensed section. Comparison of glaucony characteristics across different depositional systems at the same stratigraphic level shows a slight decrease in maturity and abundance from distal to proximal locations. This lateral tendency reflects more suitable conditions for glauconitization in open-marine environments than in shallow waters
Les rapports de Marrakech avec le monde rural dans le domaine de l'artisanat
No full textThrough its cottage industry, Marrakech keeps a complex and twofold relationship with its rural world. The town itself welcomes rural craftmen, often in financial difficulties, imports raw materials needed by them from the country and spreads further and further away the branches, commercializes cottage industry products made in the small rural centres and the southern country. Conversely, these centres undergo a few modifications thanks tho the présence of this cottage industry focus in Marrakech .'survival of farms, land transformations domestic re-investment. But all these backlash effects seem quite limited.Marrakech entretient avec le monde rural, par le biais de l'artisanat, des rapports complexes et à double sens. La ville accueille des artisans ruraux, souvent en difficulté, importe de la campagne des matières premières nécessaires à son artisanat, en étendant de plus en plus loin ses antennes de collecte, commercialise des produits artisanaux fabriqués dans les petits centres ruraux et les campagnes du sud marocain. Inversement, les campagnes subissent quelques transformations du fait de la présence de ce gros pôle artisanal à Marrakech : survie de l'exploitation agricole, transformations foncières, réinvestissements domestiques. Mais cet effet-retour parait bien limité.Lagdim Soussi M. B. Les rapports de Marrakech avec le monde rural dans le domaine de l'artisanat. In: Méditerranée, troisième série, tome 59, 4-1986. Villes et campagnes au Maroc. pp. 21-31
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
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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