1,720,957 research outputs found
Prospection géomorphologique dans le Mirambello
No full textGhilardi Mathieu, Kunesch Stephane, Farnoux Alexandre. Prospection géomorphologique dans le Mirambello. In: Bulletin de correspondance hellénique. Volume 133, livraison 2, 2009. pp. 671-672
Le cône de la Momie : un nouveau type de dépôt proglaciaire mis en place depuis la fin du Petit Age Glaciaire. [The Momie cone : a new type of proglacial deposit constituted since the end of the Little Ice Age]
No full textThe proglacial "cône de la Momie " (Massif des Ecnns, French Alps) is a new type of deposit under a hanging glacier. The dynamic and geomorphic characteristics are clearly different from what was described for the traditional proglacial sandar deposits and slope deposits in paraglacial context. Morphosedimentary observations and old documents analysis show that the construction of this cone results from an accumulation remaining from avalanches / rock falls, from the torrent of the glacier de la Momie, and punctually from debris flows since one century. Thus accretion rates appear 100 times greater than those observed for this area or for other mountainous areas. This fast sedimentation results from the conjunction of the modern climatic change which implies a glacial retreat and strong slopes which diversify the nature of processes and increase their intensity.
The type of cone construction illustrates deposition processes often observed in the Ailefroide Valley which was definitely ice free at the end of the Younger Dryas.Le cône proglaciaire de la Momie (Massif des Ecrins, Alpes françaises) constitue un nouveau type de dépôt, sous un glacier suspendu, dont la sédimentologie et la dynamique de mise en place se distinguent nettement de ce qui a été décrit à propos des sandar " classiques " et des dépôts colluviaux pénglaciaires. Des observations morphosédimentaires et l'analyse de documents anciens montrent que l'édification de ce cône résulte d'une accumulation de débris provenant d'avalanches, de chutes de pierres, du chaînage torrentiel associé au torrent émissaire du glacier de la Momie, et ponctuellement de coulées de débris depuis un peu plus d'un siècle. Cette construction rapide suppose des taux d' accretion plus de 100 fois supérieurs à ceux évoqués pour ce secteur ou pour d'autres régions montagneuses, ils résultent de la conjonction du réchauffement climatique actuel et du retrait glaciaire consécutif et de fortes pentes qui multiplient la nature des processus de remobihsation et exacerbent leur intensité. Le type de mise en place du cône semble bien rendre compte du fonctionnement d'une grande partie des dépôts de la basse vallée d'Ailefroide qui a été définitivement désenglacée à la fin du Dryas récent.Jomelli Vincent, Bertran Pascal, Kunesch Stephane. Le cône de la Momie : un nouveau type de dépôt proglaciaire mis en place depuis la fin du Petit Age Glaciaire. [The Momie cone : a new type of proglacial deposit constituted since the end of the Little Ice Age]. In: Quaternaire, vol. 13, n°3-4, 2002. Événements rapides, instabilités, changements culturels au Quaternaire. pp. 257-265
Les enregistrements morphosédimentaires et biostratigraphiques des fonds de vallée du bassin-versant de la Beuvronne (Bassin parisien, Seine-et-Marne, France) : perception des changements climatoanthropiques à l'Holocène[ Holocene morpho-sedimentary and bio-stratigraphy records from alluvial fills of the Beuvronne river catchment (Paris basin, France): perception of climatic changes and human activities. ]
No full textThe Beuvronne catchment area (Pans basin, France) has yielded important alluvial fills recording the environmental evolution since the Holocene Sedimentologic and biostratigraphic analyses (infrared spectrometry, grain size, organic matter quantification, palynology and malacology) indicate different modalities and rythms of morpho-sedimentary responses in the catchment area, correlated to climatic changes and land uses during the first part of the Holocene. Until 4000 BP climatic warming associated with slope stability produce autochtonous organic sedimentation. From 4000 BP, detrital input allows to identify a major hydrological crisis correlated to the start of human activities. Magnitude of this cnsis increases in relation with climatic detenoration. After 3500 BP, morpho-sedimentary responses appear diachronic in the different sections of the valley. In this region of low altitude plateaux, sediment responses during the Late Holocene indicate an increasing human control, probably masking the influence of climate.Le bassin-versant de la Beuvronne (Bassin parisien, France) offre des remplissages sédimentaires de fonds de vallée qui retracent son évolution environnementale depuis l'Holocène. L'étude intégrée des réponses morphosédimentaires fondée sur une étude sédimentologique fine (spectromètrie infrarouge, granulomètrie et quantification de la matière organique) et des biomarqueurs (pollens, malacofaunes) précise les étapes et les modalités de la dynamique fluviale en correlation avec les modifications climato-anthropiques depuis 1 1 000 ans. L'amélioration climatique de la première moitié de l'Holocène aboutit à une stabilisation des versants et engendre une sédimentation autochtone et organique dans toutes les sections des vallées étudiées. A partir de 4000 BP, la reconnaissance d'une dynamique fluviale plus franche peut être correlée à des impacts anthropiques exacerbés par différentes phases de dégradation climatique. Le diachronisme amont-aval des réponses morphosédimentaires postérieurement à 3500 BP souligne le rôle prépondérant de l'anthropisation des milieux sur le fonctionnement du système fluvial et relativise le poids des fluctuations climatiquesOrth Paul, Pastre Jean François, Gauthier Agnès, Limondin-Lozouet Nicole, Kunesch Stephane. Les enregistrements morphosédimentaires et biostratigraphiques des fonds de vallée du bassin-versant de la Beuvronne (Bassin parisien, Seine-et-Marne, France) : perception des changements climatoanthropiques à l'Holocène[ Holocene morpho-sedimentary and bio-stratigraphy records from alluvial fills of the Beuvronne river catchment (Paris basin, France): perception of climatic changes and human activities. ]. In: Quaternaire, vol. 15, n°3, 2004. pp. 285-298
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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