86,982 research outputs found
Cristaux de rozénite et de mélantérite dans la mine de diatomites de La Bade (Cantal)
No full textLa découverte de cristaux de rozénite et de mélantérite dans une mine de diatomites permet de préciser les caractéristiques physiques, optiques et chimiques de ces minéraux. Les conditions de stabilité des divers sulfates ferreux sont envisagées.Brousse Robert, Gasse-Fournier F., Lebouteiller F. Cristaux de rozénite et de mélantérite dans la mine de diatomites de La Bade (Cantal). In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 89, 3, 1966. pp. 348-352
African wetlands and shallow water bodies : bibliography = Zones humides et lacs peu profonds d'Afrique : bibliographie
No full textPalaeoenvironmental changes in the Mediterranean region 250-10 kyr BP: a critical review of the evidence
No full textAfrican wetlands and shallow water bodies : bibliography = Zones humides et lacs peu profonds d'Afrique : bibliographie
No full textHydrologie et géochimie isotopique
No full textPlusieurs enregistrements lacustres de régions tropicales des deux hémisphères (Tibet, Ethiopie, Tanganyika, Madagascar) illustrent la spécificité des réponses régionales au changement des facteurs forçants du climat. Après avoir rappelé la méthodologie et les techniques utilisées, on résume les faits recensés dans les quatre régions. Les variations hydroclimatiques s'expliquent en partie par le facteur insolation. Les sites considérés enregistrent tous un déficit hydrologique annuel moyen pendant le Dernier Maximum Glaciaire, fait attendu des changements des paramètres orbitaux en hémisphère nord, et attribuable aux conditions thermiques glaciaires qui régissent la température de surface des océans et la teneur de l'atmosphère en vapeur d'eau en hémisphère sud. D'autres causes sont à rechercher pour rendre compte des variations post-glaciaires à très court terme affectant de larges domaines géographiques. (Résumé d'auteur
"La Thèbes des morts. La dynamique thébaine dans les idées égyptiennes de l'au-delà"
No full textNei contributi dell'articolo a più mani si evince come nel corso del I millennio a.C. si sia affermata in ambito archeologico-funerario una dinamica di pensiero tipicamente tebana, che avrà effetti anche su altre zone dell'Egitto
Environmental changes in the Tibetan plateau and surrounding areas
No full textA 12.4 m core collected from the eastern part of Lake Bangong provided a continuous Holocene record. This core was analyzed for diatoms, ostracods, charophytes, content in total organic carbon and identification of organic particles contained in the sediments. The record is remarkable for the abundance and diversity of its microorganisms. An oligo- to mesosaline marsh occupied the core site before 9.5 ka B.P. Bangong was most likely closed. A sudden filling of the lake basin by dilute, nutrient-poor water occurs around 9.4 ka B.P. Maximum lake extent seems to have occurred around 9.4-8.7 ka B.P. Generally freshwater, relatively deep conditions were maintained up to 6.3 ka B.P., although interrupted by short-term regressive events between 5.6 and 7.5 ka B.P. A trend towards palustral conditions begins after 6.3 ka B.P. and the interval 3.9-3.2 ka B.P., rich in detrital organic material, coincides with an extremely low lake level. A last lacustrine episode of minor amplitude is recorded from about 3 to 2 ka B.P., before the closure of the system leading again to slightly saline conditions. The resemblances and synchronism between environmental changes recorded at Bangong and in Lake Sumxi, situated 200 km northwards and 800 m higher in elevation, indicate that regional climatic changes have been the major driving factor on ecological and hydrobiological changes in lakes of western Tibet
Secular change of extreme monthly precipitation in Europe
No full textTemporal changes in the occurrence of extreme events in time series of observed precipitation are investigated. The analysis is based on a European gridded data set and a German station-based data set of recent monthly totals (1896=1899–1995=1998). Two approaches are used. First, values above certain defined thresholds are counted for the first and second halves of the observation period. In the second step time series components, such as trends, are removed to obtain a deeper insight into the causes of the observed changes. As an example, this technique is applied to the time series of the German station Eppenrod. It arises that most of the events concern extreme wet months whose frequency has significantly increased in winter. Whereas on the European scale the other seasons also show this increase, especially in autumn, in Germany an insignificant decrease in the summer and autumn seasons is found. Moreover it is demonstrated that the increase of extreme wet months is reflected in a systematic increase in the variance and the Weibull probability density function parameters, respectively
Variations on the Author
No full text“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
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