1,720,973 research outputs found
Modeling the paleogeography of north-western Palaeotethys across the Permian-Triassic boundary: constraints and possible solutions.
Full text linkWe simulated for the first time the palaeogeographic evolution of three thin depositional sequences of the shallow marine western Palaeotethys, deposited in the Southern Alps (SA, ftaly) during the devastating end-Per mia n extinction. The iimulation is calibrated by a rich set of published field data measured in the uppermost Bellerophon Formation-Iowermost Werfen Fm. Data and palaeogeographic maps are located in the palinspastically restored SA area. The employed software is a lpreliminary version of SIMSAFADIM-CLASTIC that simulates: I) the spatial distribution of terrigenous and clastic carbonate, b) rbe fossil cootent, c) the microbial content. The models (maps) "'ere realized as a back-analysis, by calibration with the 3D .architecture of real sedimentary sequences, particularly on the patial distribution of terrigenous-clastic carbonate ratios. The 'mulation covers a peri od of about 70 kyr, whereas each sedimentary sequeoce corresponds to a time-span of 15-20 kyr; dJe low-stand tract spans 5-6 kyr. Models that best match reality t("ere achieved by using a curve of sea level changes obtained empirically. The maximum sea level change is about a dozen lIletres; the study area underwent local short periods of emersion, represented by soil or intertidal carbonates, followed by shallow marine, foreshore facies. The sea level change curve is likely to represent the global reference. We interpret results of the model ~. the hypothesis that the curve of sea level change presented _ re could have been produced by alternating global warming d cooling of the oceans. This curve, obtained by an
• dependent method, would be utilized as an important ronstraint on the numerical global models of coupled tmosphere--ocean circulation. On the contrary, the . appearence of Permian-type tua (fusulinids, foraminifers, 'valves and algae) pre-dating tbe P-T bouodary does not match
e field data because tbe software lacks a few specific functions; ese biologie carbonate components seem to have beeen bstituted by a still-unknown environmental cause producing lites and carbonates of microbialitic origin
Lithostratigraphie et evolution des industries du Paleolithique inferieur et moyen a l'Est de Bologne (Italie)
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Widespread diffusion of technical innovations around 300,000 years ago in Europe as a reflection of anthropological and social transformations? New comparative data from the western Mediterranean sites of Orgnac (France) and Cave dall'Olio (Italy).
No full textDuring MIS (Marine Isotope Stage) 9 and the transition to MIS 8 – around 350–300,000 years ago – some
lithic assemblages in Europe reflect marked transformations in technical behavior. These transformations
involved the standardization of products and the development of diversified and elaborated débitage
methods which are considered to be markers of the transition from the Lower to the Middle Palaeolithic
i.e. from Mode 2 to Mode 3. Taking the analysis of the sites of Orgnac 3 (Ardèche, France) and Cave dall’Olio
(Emilia Romagna, Italy) as a starting point, this paper discusses the variability of these assemblages
in Southern Europe as well as the social and anthropological implications of the emergence of new technical
behavior. It also aims to show that common features existed both in Northern and Southern Europe.
The development of more complex technical systems on a progressively wider territory and at an increasingly
earlier age argues in favor of the hypothesis of a close connection with the process of ‘‘Neanderthalisation’’,
possibly accompanied by the transmission of ideas through extensive social networks
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
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
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