804 research outputs found
La chapelle Saint-LĂ©onard de Rouelles retrouvĂ©e (1479-1480) : le vĆu dâun seigneur revenu de captivitĂ©
Le passĂ© mĂ©diĂ©val de la ville du Havre est mĂ©connu. La redĂ©couverte dâun compte de construction, dâanciens relevĂ©s et dâune statue permettent de mettre en lumiĂšre lâaction des seigneurs du lieu, les Malet de Graville, et de retrouver la trace dâun patrimoine disparu, la chapelle Saint-LĂ©onard de Rouelles. Ă ce chantier, au parti architectural modeste, contribuĂšrent quelques artisans notables, notamment le maĂźtre dâĆuvre, Guillaume de Longuesne, ou encore le maçon et tailleur dâimages Guillaume le Franc, auteur de la statue de saint LĂ©onard, patron des prisonniers, qui ornait lâĂ©difice. Cette sculpture au dĂ©cor hĂ©raldique Ă©loquent ainsi que la date de construction de la chapelle font dâelle le fruit dâun vĆu de Jean VI Malet de Graville formulĂ© durant sa captivitĂ© anglaise et la marque de sa volontĂ© de reprendre en main des seigneuries ravagĂ©es par la guerre de Cent Ans et dĂ©laissĂ©es pendant son absence.The medieval past of the city of Le Havre is not well known. The rediscovery of a construction account, old drawings and a statue has enabled us to highlight the action of the Malet de Graville lords and to trace a lost heritage, the Saint-LĂ©onard de Rouelles chapel. This modest building was created by some notable craftsmen, including the mason Guillame de Longuesne or the mason and sculptor Guillaume le Franc who made the statue of Saint LĂ©onard, patron saint of prisoners, which adorned the chapel. This sculpture decorated by the heraldic ornaments and the date of construction of the building show that it was probably the consequence of a vow made by Jean VI Malet de Graville during his captivity in England. It is also the sign of his resolve to regain control over his lands torn by the Hundred Year War, and neglected during his absence.Die mittelalterliche Geschichte von Le Havre wird oftmals verkannt. Die Wiederentdeckung von Baurechnungen, alten Aufzeichnungen sowie einer Statue hat es nun erlaubt, die TĂ€tigkeit der lokalen Herrschaft, der Familie Malet de Graville, verstĂ€rkt ins Licht zu rĂŒcken und auf die Spuren eines verschwundenen Denkmals, der Kapelle Saint-LĂ©onard de Rouelles, aufmerksam zu machen. An diesem architektonisch gesehen bescheidenen Bau waren mehrere bedeutende Handwerker beteiligt, insbesondere der Baumeister Guillaume de Longuesne und der Steinmetz und Bildhauer Guillaume le Franc, Schöpfer der den Bau schmĂŒckenden Statue des heiligen Leonhard, des Schutzheiligen der Gefangenen. Aus dem reichhaltigen heraldischen Dekor, der Leonhardsskulptur sowie aus der Zeitpunkt des Baus der Kapelle lĂ€sst sich erschlieĂen, dass ihre Errichtung einem von Jean VI. Malet de Graville in englischer Gefangenschaft geleisteten GelĂŒbde folgt und seinen Willen zur MachtrĂŒckgewinnung in seinen LĂ€ndereien verdeutlicht, die durch den HundertjĂ€hrigen Krieg verwĂŒstetet und wĂ€hrend seiner Abwesenheit verfallen waren
Jean-Hugues Barthélémy, Simondon
AprĂšs un timide regain dâintĂ©rĂȘt depuis sa mort en 1989, lâĆuvre de Gilbert Simondon est, depuis une dizaine dâannĂ©es, le lieu dâune vĂ©ritable redĂ©couverte qui ne cesse de prendre de lâampleur. On en veut pour preuve la publication rĂ©cente de confĂ©rences et de cours, pour beaucoup inĂ©dits. Jean-Hugues BarthĂ©lĂ©my est lâun des instigateurs de cette redĂ©couverte. Ă lâorigine de la crĂ©ation du CIDES, il dirige la publication des Cahiers Simondon. Ayant dĂ©jĂ consacrĂ© trois ouvrages Ă Simondon, la ..
Affectation de composantes basée sur des contraintes énergétiques dans une architecture multiprocesseurs en trois dimensions
La lithographie et la loi de Moore ont permis des avancées extraordinaires dans
la fabrication des circuits intégrés. De nos jours, plusieurs systÚmes trÚs complexes
peuvent ĂȘtre embarquĂ©s sur la mĂȘme puce Ă©lectronique.
Les contraintes de dĂ©veloppement de ces systĂšmes sont tellement grandes quâune
bonne planification dÚs le début de leur cycle de développement est incontournable.
Ainsi, la planification de la gestion énergétique au début du cycle de développement est
devenue une phase importante dans la conception de ces systĂšmes.
Pendant plusieurs annĂ©es, lâidĂ©e Ă©tait de rĂ©duire la consommation Ă©nergĂ©tique en
ajoutant un mĂ©canisme physique une fois le circuit crĂ©Ă©, comme par exemple un dissipateur de chaleur. La stratĂ©gie actuelle est dâintĂ©grer les contraintes Ă©nergĂ©tiques dĂšs les premiĂšres phases de la conception des circuits. Il est donc essentiel de bien connaĂźtre la dissipation dâĂ©nergie avant lâintĂ©gration des composantes dans une architecture dâun systĂšme multiprocesseurs de façon Ă ce que chaque composante puisse fonctionner efficacement dans les limites de ses contraintes thermiques. Lorsquâune composante fonctionne, elle consomme de lâĂ©nergie Ă©lectrique qui est transformĂ©e en dĂ©gagement de chaleur.
Le but de ce mémoire est de trouver une affectation efficace des composantes dans
une architecture de multiprocesseurs en trois dimensions en tenant compte des limites
des facteurs thermiques de ce systĂšme.Lithography and Mooreâs law have led to extraordinary advances in integrated
circuits manufacturing. Nowadays, many complex systems can be embedded on the
same chip.
Development constraints of these systems are so significant that a good planning
from the beginning of the development stage is essential. Thus, the planning of energy
management at the beginning of the development cycle has become important in the
design of these systems.
For several years, the idea was to reduce energy consumption by adding a cooling
system once the circuit is created, a heat sink for example. The current strategy is to integrate energy constraints in the early stages of circuits design. It is therefore important to know the energy dissipation before the integration of the components in the architecture of a multiprocessor system so that each component can work within the limits of its thermal stresses. When a component is running, it consumes electric energy which is converted into heat.
The aim of this thesis is to find an efficient assignment of components in a multiprocessor system architecture in three dimensions, taking into account the limits of its thermal factors
Physical and Mechanical Properties of Thermally Cracked Andesite Under Pressure
International audienceThe efects of thermal crack damage on the physical properties and rupture processes of andesite were investigated under triaxial deformation at room temperature. Thermal cracking was induced by slowly heating and cooling samples. The efects of heat treatment temperatures ranging between 500 °C and 1100 °C on the P-wave velocities and on the microstructure were investigated. Then, the mechanical properties of andesite samples treated at 930 °C were investigated under triaxial stress at room temperature using constant strain rate tests and conining pressures ranging between 0 and 30 MPa. Similar triaxial experiments were conducted on non-heat-treated samples. Our results show that: (1) for heat treatments at temperatures below 500 °C, no signiicant changes in the physical properties are observed; (2) for heat treatments in the temperature range of 500-1100 °C, crack density increases; and (3) thermal cracking has no inluence on the onset of dilatancy but increases the strength of the heat-treated samples. This last result is counterintuitive, but seems to be linked with the presence of a small fraction of clay (3%) in the non-heat-treated andesite. Indeed, for heat treatment above 500 °C, some clay melting is observed and contributes to sealing the longest cracks
Dynamic weakening and amorphization in serpentinite during laboratory earthquakes
The mechanical properties of serpentinites are key factors in our understanding of the dynamics of earthquake ruptures in subduction zones, especially intermediate-depth earthquakes. Here, we performed shear rupture experiments on natural antigorite serpentinite, which showed that friction reaches near-zero values during spontaneous dynamic rupture propagation. Rapid coseismic slip (>1 m/s), although it occurs over short distances (<1 mm), induces significant overheating of microscale asperities along the sliding surface, sufficient to produce surface amorphization and likely some melting. Antigorite dehydration occurs in the fault walls, which leaves a partially amorphized material. The water generated potentially contributes to the production of a low-viscosity pressurized melt, explaining the near-zero dynamic friction levels observed in some events. The rapid and dramatic dynamic weakening in serpentinite might be a key process facilitating the propagation of earthquakes at intermediate depths in subduction zones
Thermo-mechanical simulation of a magnetic pulse welding process with first experimental validations
Le cuivre est largement utilisé dans les procédés industriels de chauffage ou de refroidissement notamment en raison de ses propriétés thermiques. Pour des raisons économiques mais aussi d'optimisation de masse, l'industrie cherche à le remplacer partiellement, notamment par de l'aluminium. Le projet européen H2020 Join'Em (http:\\www.join-em.eu\) vise à la réalisation d'assemblages bi-matériaux par la technologie de soudage par impulsion magnétique. Deux cas issus de la base de données expérimentales du projet sont simulés. La méthodologie ainsi que les résultats numériques sont présentés ci-aprÚs avec confrontation éventuelle aux résultats issus de l'expérience
Temperatures reached by the roof structure of Notre-Dame de Paris in the fire of April 15th 2019 determined by Raman paleothermometry
When the Notre-Dame de Paris Cathedral burnt, the oak frame was almost completely destroyed. The temperatures reached were determined by an original method of Raman paleothermometry applied to charcoals collected after the fire. The Raman spectra of the charcoals evolve monotonically and irreversibly with the carbonization temperature and can therefore be used as âfossil thermocouplesâ. A calibration curve was constructed from the carbonization between 500 and C of unburnt oak pieces from the cathedral. Thus, the maximum charcoal formation temperature during the cathedral fire can be determined. The Raman analysis of charcoals sampled in situ serves to construct the first cartography of the carbonization temperatures. The temperatures reach values above C in the crossing. These experimental data are the basis for a discussion of the consequences of the fire regarding possible lead dissemination and thermal alterations of limestone
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