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Search Results: 1 - 6 of 6 matches for " Meignen "
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Les origines de l’Homme moderne au Proche Orient
Liliane Meignen
Bulletin du Centre de Recherche Fran?ais de Jérusalem , 2008,
Abstract: Débuté en 1982 à l’initiative de B. Vandermeersch (Université Bordeaux I) et O. Bar Yosef, alors professeur à l’Université hébra que de Jérusalem, un programme de recherche franco-israélien portant sur évolution des industries et des types humains au Levant, de la fin du Paléolithique inférieur au début du Paléolithique supérieur est développé depuis lors, qui repose sur des recherches interdisciplinaires entreprises dans les grottes de Qafzeh (fouilles Vandermeersch), de Kébara (fouilles...
The Origins of Modern Human in the Near East
Liliane Meignen
Bulletin du Centre de Recherche Fran?ais de Jérusalem , 2008,
Abstract: Started in 1982 by B. Vandermeersch (University of Bordeaux I) and O. Bar Yosef, then professor at the Hebrew University of Jerusalem, a french-israeli research program entitled “Evolution of the industries and the human types in the Levant, from the end of the Lower Paleolithic to the beginning of the Upper Paleolithic” is developed since then, which rests on interdisciplinary research carried out at Qafzeh (excavations by Vandermeersch), at Kebara Cave (excavations led in the frame of this ...
On the Analysis and Evaluation of Direct Containment Heating with the Multidimensional Multiphase Flow Code MC3D
Renaud Meignen,Tanguy Janin
Science and Technology of Nuclear Installations , 2010, DOI: 10.1155/2010/289792
Abstract: In the course of a postulated severe accident in an NPP, Direct Containment Heating (DCH) may occur after an eventual failure of the vessel. DCH is related to dynamical, thermal, and chemical phenomena involved by the eventual fine fragmentation and dispersal of the corium melt out of the vessel pit. It may threaten the integrity of the containment by pressurization of its atmosphere. Several simplified modellings have been proposed in the past but they require a very strong fitting which renders any extrapolation regarding geometry, material, and scales rather doubtful. With the development of multidimensional multiphase flow computer codes, it is now possible to investigate the phenomenon numerically with more details. We present an analysis of the potential of the MC3D code to support the analysis of this phenomenon, restricting our discussion to the dynamical processes. The analysis is applied to the case of French 1300?MWe PWR reactors for which we derive a correlation for the corium dispersal rate for application in a Probabilistic Safety Analysis (PSA) level 2 study. 1. Introduction Direct Containment Heating (DCH) is a phenomenon that can potentially happen during a severe accident and may threaten the integrity of the containment by pressurization of its atmosphere. It can occur following a melting of the reactor fuel and its relocation in the bottom of the reactor vessel. Depending on the cooling conditions, the vessel might fail and the melt will be ejected out. If the primary circuit driving pressure is above some threshold, the melt will be, in a second stage, ejected out of the pit, going for a part into some small rooms (e.g., steam generator rooms, called for short hereafter subcompartments) and for the rest directly to the containment dome. If the melt can be oxidized (which is likely), then a very rapid oxidation of a large amount of the melt occurs. The hydrogen produced during this stage may subsequently burn altogether with the pre-existing one. Most of the past studies of this phenomenon were based on geometries of US NPP's (Surry, Zion, etc.). For a good synthesis of these works, the reader can consult a special issue of Nuclear Engineering and Design [1]. Regarding in particular the melt dispersion, several simplified models have been proposed in the past, mainly qualified on US reactor types, and implemented in lumped parameter codes as CONTAIN [2]. However, it is found that all models are highly dependent on the geometry with high variations of the main parameters [3]. Thus the extrapolations to other reactors, other materials,
Smoothness of Nonlinear and Non-Separable Subdivision Schemes
Basarab Matei,Sylvain Meignen,Anastasia Zakharova
Mathematics , 2010,
Abstract: We study in this paper nonlinear subdivision schemes in a multivariate setting allowing arbitrary dilation matrix. We investigate the convergence of such iterative process to some limit function. Our analysis is based on some conditions on the contractivity of the associated scheme for the differences. In particular, we show the regularity of the limit function, in $L^p$ and Sobolev spaces.
The Palaeolithic occupation of southern Alentejo: the Sado River Drainage Survey
Burke, Ariane,Meignen, Liliane,Bisson, Michael,Pimentel, Nuno
Trabajos de Prehistoria , 2011, DOI: 10.3989/tp.2011.11057
Abstract: The Sado River Drainage Survey project (2004-2008) was designed to fill a significant gap in our knowledge of the prehistory of Portugal. Southern Alentejo constitutes nearly one third of the total land mass of continental Portugal, but has received comparatively little attention from Palaeolithic archaeologists. Practically nothing was known about the prehistory of the Sado River basin, which includes the southern Alentejo plain, before now. The results of the Sado River Drainage Survey (SRDS) indicate that the Sado River basin was likely occupied at low population densities during the Middle Palaeolithic. There is some evidence for a Lower Palaeolithic presence but little or no evidence of an Upper Palaeolithic occupation. The emerging pattern suggests either an occupational hiatus or a major shift in settlement pattern towards the end of the Middle Palaeolithic. Possible explanations for this pattern, including aridification driven by climate change, are explored here. El proyecto de prospección de la cuenca del río Sado (SRDS), llevado a cabo entre el 2004 y el 2008, se dise ó para suplir la carencia de información concerniente al conocimiento actual de la Prehistoria de Portugal. Aunque la cuenca del río Sado conforma casi un tercio de la superficie continental de Portugal, aún no había recibido la debida atención para el Paleolítico. Antes de este proyecto, prácticamente nada se conocía acerca de la Prehistoria de dicha cuenca, incluyendo la llanura de Alentejo. Nuestros resultados indican una baja densidad de población durante el Paleolítico Medio, rastro de ocupaciones del Paleolítico Inferior y casi ninguna evidencia de ocupaciones asociadas al Paleolítico Reciente. A partir de los datos obtenidos, se desprende un modelo en el que se evidencia que, hacia finales del Paleolítico Medio, hubo una discontinuidad en la ocupación, probablemente asociada a cambios climáticos o del uso del territorio.
Resposta de suínos em crescimento mantidos em diferentes temperaturas
Kiefer,C.; Meignen,B.C.G.; Sanches,J.F.; Carrijo,A.S.;
Archivos de Zootecnia , 2009, DOI: 10.4321/S0004-05922009000100006
Abstract: were used 24 castrated swine distributed in completely randomized design composed for two treatments and twelve repetitions, with the objective to evaluate the behavior, physiological responses and the performance of the animals. the average temperatures of the experimental period were 21.5oc and 31.3oc, respectively, in thermal comfort and heat stress. swine under heat stress remain significantly little time in the position in foot, more time in the lying position, little time in the feeder, more time in the water through, more time in the lying position in the water through and more time sleeping in relation to those kept in thermal comfort. swine under heat stress had presented energy, protein, lysine and ration intake, weight gain and feed: gain ratio reduced and had presented minor weight of organs, except of the stomach, and had presented increased respiratory frequency and rectal and surface temperatures. swine under thermal comfort had presented greater efficiency of use of the protein and energy and greater daily protein and fat depositions in the carcass. temperatures that provoke heat stress affects negatively the behavior of growing swine.
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