Search results for "céramique"
showing 10 items of 151 documents
Lamadelaine, une nécropole de l'oppidum du Titelberg
1999
Bailly-Romainvilliers /Serris, La Motte (77) : rapport de diagnostic
2022
Cette zone d’intervention se situe entre des sites importants déjà reconnus, comme Serris Les Ruelles et différents sites de Bailly-Romainvilliers. Menée sur une surface de 532 907 m², l’opération a permis de mettre aux jours différents vestiges allant du Mésolithique à l’époque contemporaine.Pour la période la plus ancienne, il est rare de découvrir des vestiges datant du Mésolithique sur le secteur de Marne-la-Vallée, il s’agit de silex sur une petite partie de l’emprise se développant sur environ 800 m².Les tranchées ont aussi permis de mettre au jour des indices d’une occupation domestique du Néolithique final repartie sur l’ensemble de l’emprise déterminée par la présence de pièces lit…
Marly « La Grange aux Ormes » (Moselle)
2020
L’habitat protohistorique de Marly, La Grange aux Ormes, qui fait l’objet de ce volume, est situé en Moselle, à moins de 400 m de la Seille, cours d’eau dont la vallée est connue pour avoir été un important centre d’exploitation du sel aux âges du Fer. L’étude des nombreuses structures du site a permis d’observer l’évolution d’une occupation sur près de quatre siècles, de la fin de l’âge du Bronze final IIIb (Hallsatt B3) à la fin du premier âge du Fer (Hallstatt D2-D3).Cette occupation se répartit essentiellement sur deux zones, la première concentrant l’habitat proprement dit, aménagé en rive d’un chenal, alors que la seconde zone, distante de 300 m, semble réunir la plupart des activités…
Belfort pendant la Préhistoire.
2014
Jacquot, Jacqueline et Cie…. Pichets anthropomorphes en céramique
2016
Retour sur La Tronche
2016
Entanglements, transmission processes and social identities : the technical traditions of ceramics in the Trois-Lacs region and its margins (3600-300…
2019
In Western Europe, the second half of the 4th millennium is a turning point. On the Swiss Plateau, this phase is characterized by the end of Middle Neolithic cultures (Cortaillod and Pfyn) around 3550 BCE, and the emergence of Horgen after 3250 BCE. The transition between these two phases is now better documented thanks to Port-Conty type and Pfyn/Horgen settlements dated around 3400 BCE. This work aims to identify the cultural substract at the origin of the Horgen by characterizing the technical identities and entanglements at the end of the 4th millennium, then by identifying over time the transmission or abandonment of certain ways of making pots in order to determine the share of local …
Ceramique/metal component elaborated by flash sintering for ballistic protection
2012
This dissertation describes the synthesis of new components for ballistic protection with the assistance of flash sintering. Indeed, the objective is to associate two compounds showing very different sintering temperatures – such as alumina and aluminum, two reference materials for ballistic protection applications.The first synthesis method tested was the elaboration of a bi-material via the sintering of aluminump owder on alumina bulks. This study permitted to observe the formation of the alumina/aluminum bonding by scanning and transmission electron microscopy and to optimize the assembly parameters in order to obtain a bimaterials howing a strong interfacial cohesion. Adapted characteri…
Elaboration de céramiques transparentes Er YAG : synthèse de poudre par co-précipitation et frittage SPS
2013
Yttrium aluminium garnet (YAG, Y3Al5O12) transparent ceramics have attracted much attention since it can replace single crystals as host materials in solid state heat capacity lasers. These polycrystalline ceramics present improved mechanical and spectroscopic properties, as well as a better heat conductivity, lower fabrication costs for larger size materials. Furthermore, it is possible to reach higher doping concentrations as well a uniform distribution. Doping YAG with Erbium (Er:YAG) allows eye-safe emission at 1645nm. Moreover, a low doping rate (0.5%at.) enables upconversion process during laser operation. Conditions for transparency are amongst others, the absence of defects, a high …
Céramiques diélectriques commandables pour applications micro-ondes : composites à base de titanate de baryum-strontium et d'un oxyde non ferroélectr…
2001
Since the last decades, dielectric ceramics have been considered as attractive for microwave applications as tunable dielectric resonators or phase shifters. For that, ceramic devices should be tunable – change in dielectric constant with applied voltage- with moderate to low dielectric constant (30 to 1000) and loss tangent as low as possible. To reconcile these properties, composite ceramics based on Ba0.6Sr0.4TiO3 (BSTO) and a non-ferroelectric oxide with a low dielectric constant (MgTiO3 or MgO) were synthesised. The aim of this study was to correlate the microstructure with the dielectric properties, especially the Curie temperature and the dielectric relaxation phenomena.Ceramics with…