436 research outputs found
Interaction entre un tourbillon et une couche limite Application au contrôle d’écoulement
No full textL’objectif de cette étude est d’analyser expérimentalement l’interaction entre un tourbillon longitudinal
isolé et une couche limite se développant sur un profil portant bi-dimensionnel de type NACA0015 pour des
incidences faibles et autour du décrochage statique. Le travail a été réalisé en tunnel hydrodynamique à Reynolds
5 105, le tourbillon est généré en amont par une aile elliptique de section NACA0020. Les campagnes de
mesures ont été réalisées par LDV et PIV en ce qui concerne le champ de vitesse et par balance hydrodynamique
en ce qui concerne les efforts globaux.
Ce type de configuration peut être retrouvé dans les applications de contrôle d’écoulement (par
utilisation de générateurs de vortex) ou en hydrodynamique navale dans les interactions « tourbillon d’ogivesafran
de gouvernail ». L’originalité de la configuration étudiée réside dans le fait que le vortex est généré hors
couche limite, contrairement à la configuration classique du contrôle d’écoulement en aérodynamique, où le
vortex est généré à une distance de l’ordre de l’épaisseur de couche limite.
Les résultats ont montré que la présence du tourbillon inhibe le phénomène d’hystérésis lors du
décrochage statique du profil NACA0015, ceci étant associé à une modification notable des états de couche
limite tant en valeur moyenne que fluctuante. En effet, pour les faibles incidences, la présence du tourbillon
longitudinal modifie le gradient de pression, retarde de manière globale le décollement de la couche limite en réaccélérant
le fluide à la paroi. Pour les incidences plus élevées, on observe un ré-attachement de la couche limite
dans la région d’inflow (zone d’apport de fluide rapide à la paroi). La dynamique de cet écoulement est analysée
par décomposition orthogonale en modes propres (POD) dans le but de mieux appréhender l’alignement spatial
tourbillonnaire dans le sillage des corps mis à grande incidence et contrôlé
Sebastien Rale vs. New England: A Case Study of Frontier Conflict
No full textAuthor\u27s original abstract: A study was made of the Jesuit missionary, Sebastien Rale, and his role in New England-New France relations. French and English primary and secondary materials were examined to give the broadest possible view of the man and to place him in historical context.
It was found that Sebastien Rale was not an agent of New France. The conflicting opinions surrounding the mission of Norridgewock and the border war of the 1720\u27s were traced to the problems of Massachusetts-Abnaki relations. Rale\u27s frequent and testy letters to the government of the Bay Colony were blunt reactions to what he viewed as religious and territorial threats against his mission.
The frontier conflict between 1713 and 1722 was not the result of French Imperial policy. The French insisted that the Abnakis were allies but refused active participation in the Indians\u27 quarrel with New England. Policy was developed in Maine by the Jesuits. The missionaries were only secondarily interested in Quebec\u27s desire to prevent Massachusetts\u27 settlement of the Kennebec. With the declaration of war in July, 1722, however, the Jesuits left the Abnakis in the hands of the governor and the intendant of New France on whom the Indians relied for vital war supplies.
Finally, the controversial attack on Norridgewock was appraised. It was found that no secondary account had fully evaluated the sources. Examination led to the discovery of crucial inconsistencies in the primary accounts of New England. The French sources were found to be based on the understandably confused impressions of the fleeing Indians. In large measure the English sources present the more valid picture: the sudden attack, the panicked confusion, and Sebastien Rale dying with gun in hand. After Rale\u27s death the war drew to a close. Without Sebastien Rale\u27s persuasion and determination, the Abnakis were not able to present a united front against colonial expansion
Steve J. Chavez recital thesis 2012
No full textThesis (M.M.)
California State University, Los Angeles, 2012Committee members: Sebastien Vallee, Jeffrey Benedict, John KennedyThe musical selections from this Master recital were not chosen with a specific theme in mind, rather each selection was carefully selected to represent the requisite musical styles stemming from the 18th to 20th century.All the literature was selected based on the requirements of the music department representing the technical skill level worthy of a graduate student from the institution of California State University, Los Angeles. This written project is the presentation of historical and musical research gathered by this author in preparation for this recital. The selections of Bach, Handel, Beethoven, Schubert, Faure, Menotti, Hoiby, and Barber are discussed in turn
A Vectoring Thrust Coaxial Rotor for Micro Air Vehicle: Modeling, Design and Analysis
No full textThe growing interest of rotary wing UAVs, for military and civilian applications, has encouraged designers to consider miniaturized configurations, more efficient in terms of endurance, payload capability and maneuverability. The purpose of this paper is to study a new configuration of coaxial rotor as applied to a micro aerial vehicle (MAV) with the intention to guarantee the vehicle maneuverability while removing unnecessary control surfaces which would increase wind gust sensitivity. Coaxial rotor configurations maximize the available rotor disk surface and allow for torque cancelation. Tilting rotors may allow for the vehicle control
Considerations sur l'ordre de Cincinnatus, [electronic resource] : ou imitation d'un pamphlet anglo-americain. Par le comte de Mirabeau. Suivies de plusieurs pieces relatives a cette institution; ... d'un pamphlet du Docteur Price, intitule: Observations on the importance of the American Revolution, ...
No full textSebastien Roch Nicholas Chamfort is given as joint author by Querard and Barbier.A reissue of the 1784 Londres edition, with a different title-page.Sig. H1 is a cancel - The 'Avis' is dated: Londres, 20 septembre, 1784.Printer's name from colophon.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Modélisation, design et analyse d'un nouveau concept de drone à voilure tournante, à poussée vectorielle
No full textL'intérêt croissant des drones voilure tournante, pour des applications militaires et civiles, a encouragé les concepteurs à considérer de nouvelles configurations miniaturisés, plus efficaces en termes d'endurance, capacité d'emport et de maniabilité. Le but de cet article est d'étudier une nouvelle configuration de rotor coaxial, dans le but de garantir la maniabilité du véhicule tout en enlevant les surfaces de contrôle inutiles qui augmentent la sensibilité aux rafales de vent. Ce papier vise à étudier une version modifiée d'un contrarotatif classique, dans lequel les rotors peuvent être inclinés de manière à créer des forces et des moments de dérive potentiellement utilisables pour la maniabilité. Lorsque les rotors rotatifs sont inclinés, ils ne sont pas coaxiaux et des effets gyroscopiques sont créés. La complexité d'un mécanisme de plateau cyclique a été remplacée par un mécanisme d'inclinaison qui est actuellement assurée par servomoteurs classiques. À l'avenir, il est prévu d'utiliser un matériau électroactif. Dans le prototype présenté, la direction de la poussée des deux rotors peut être redirigée par les une inclinaison latérale et longitudinale des rotors. Un modèle théorique du mécanisme a été mis au point sur la base d'un modèle mécanique qui comprend les forces, moments et les effets gyroscopiques induites par les pièces en rotation. En plus de l'approche théorique, un dispositif expérimental a été mis au point. Il est basé sur une balance à 5 composantes permettant de mesurer les efforts et moments résultants des différentes inclinaisons
Limit Theorem for a Modified Leland Hedging Strategy under Constant Transaction Costs rate
No full textWe study the Leland model for hedging portfolios in the presence of a constant proportional transaction costs coefficient. The modified Leland's strategy recently defined by the second author, contrarily to the classical one, ensures the asymptotic replication of a large class of payoff. In this setting, we prove a limit theorem for the deviation between the real portfolio and the payoff. As Pergamenshchikov did in the framework of the usual Leland's strategy, we identify the rate of convergence and the associated limit distribution. This rate turns out to be improved using the modified strategy and non periodic revision dates.Asymptotic hedging ; Leland-Lott strategy ; Transaction costs ; Martingale limit theorem.
Going Serverless with Knative on Kubernetes
No full textAbstract:
After reviewing some of the latest evolutions in Kubernetes we will discuss the serverless computing paradigm and highlight a few application use-cases. We will then introduce Knative, a system built on top of Kubernetes which provides components to build and serve applications as well as manage events. Through quick demos will demonstrate several key capabilities like scaling to zero and also highlight future directions with service mesh technologies.
Bio:
Sebastien is the co-founder of TriggerMesh (https://triggermesh.com) a serverless management platform built on Knative. He is the author of the Docker and Kubernetes O'Reilly cookbooks and was the CMS Tier-2 site lead at Purdue University more than 10 years ago
GALDIERO is CO-FIRST AUTHOR. Phagocytes as Corrupted Policemen in Cancer-Related Inflammation
No full textInflammation is a key component of the tumor microenvironment. Tumor-associated macrophages (TAMs) and tumor-associated neutrophils (TANs) are prototypic inflammatory cells in cancer-related inflammation. Macrophages provide a first line of resistance against infectious agents but in the ecological niche of cancer behave as corrupted policemen. TAMs promote tumor growth and metastasis by direct interactions with cancer cells, including cancer stem cells, as well as by promoting angiogenesis and tissue remodeling and suppressing effective adaptive immunity. In addition, the efficacy of chemotherapy, radiotherapy, and checkpoint blockade inhibitors is profoundly affected by regulation of TAMs. In particular, TAMs can protect and rescue tumor cells from cytotoxic therapy by orchestrating a misguided tissue repair response. Following extensive preclinical studies, there is now proof of concept that targeting tumor-promoting macrophages by diverse strategies (e.g., Trabectedin, anti-colony-stimulating factor-1 receptor antibodies) can result in antitumor activity in human cancer and further studies are ongoing. Neutrophils have long been overlooked as a minor component of the tumor microenvironment, but there is evidence for an important role of TANs in tumor progression. Targeting phagocytes (TAMs and TANs) as corrupted policemen in cancer may pave the way to innovative therapeutic strategies complementing cytoreductive therapies and immunotherapy
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