82 research outputs found
Flow modeling confrined between a stator and a high-speed rotor
No full textLe projet e-MECA : electro-Mécanique Embarquée à Compacité Améliorée, dont l’objectif est de concevoir une machine ultra compacte et ultra rapide à une puissance utile de 12Kw, trouve son application dans les véhicules mild et full hybrides. Ce type de machine présente en effet un fort potentiel de déploiement industriel en très grandes séries à des prix abordables. Pour ces machines, les pertes de charge liées aux écoulements dans le jeu constituent des enjeux essentiels pour les constructeurs. La présente étude porte sur le moyen d’identifier de ces pertes des machines électriques ultra-compactes et ultra-rapides (50 000 rpm).Cette thèse a pour objet l’étude des pertes aérauliques dans l’espace entre le rotor et le stator d’une machine électrique ultra-rapide (≈ 250 m/s) et ultra-compacte (0,5mm - 2mm d’entrefer), en cherchant à répondre aux spécifications élaborées par nos partenaires dans le cadre du projet e-MECA.The project e-MECA: electromechanical engineering Embarked in Improved Compactness, the objective of which is to design a machine with a small gap and high speed rotor with a useful power of 12Kw, finds its application in mild and hybrid vehicle. This type of machine indeed presents a high potential in the industrial deployment in very big series to affordable prices. The losses in these machines are linked to the flow in the gap has a significant importance for the manufacturers. This study aims to identify these losses for the ultra-compact and ultrafast electric machines (50 000 rpm).This thesis is a study of the air losses in the space between the rotor and the stator of an ultra-fast electric machine (≈ 250 m/s) and ultra-compact (0,5mm - 2mm of air-gap). This study was done to meet the specifications that had been elaborated by our partners in the e-MECA project
Baset - Bubastis - Tell Basta
No full textInhalt: Habachi, Labib: Tell Basta Chapter 1: Introductory: Bubatis and its monuments Chapter II: The temple of Pepi I [I]: Description Chapter III: The temple of Pepi [III]: Finds and importance Chapter IV: General notes on the great temple [I]: Mihos temple and entrance hall Chapter V: General notes on the great temple [II]: Festival hall and hypostyle hall Chapter VI: General notes on the great temple [III]: The temple of Nektanebos (Nekht-har-hebi) Chapter VII: Work outside the temples Chapter VIII: Blocks transferred to Bubastis Chapter IX: Blocks removed from Bubastis Farid, Shafik: Preliminary report on the excavations of the antiquities department at Tell Bast
Icosahedral Quasicrystals and Cubic Approximants in Cd-Mg-RE (RE = Rare Earth) Systems: Formation, Structure, and Magnetic Properties
No full textIcosahedral Quasicrystals and Cubic Approximants in Cd-Mg-RE (RE = Rare Earth) Systems: Formation, Structure, and Magnetic Properties
No full textTohoku University博士（工学）博士学位論文 (Thesis(doctor))doctoral thesi
3D Finite element analysis of a scaled trapezoidal 3-story reinforced concrete structure on a shaking table
No full textThis master thesis is about finite element analyses of a 3D model of a 1/4th scaled trapezoidal 3-story reinforced concrete mock-up on a shaking table which is part of Smart 2013 international benchmark. The idea of this benchmark is to asses and predict the dynamic behavior of the reinforced concrete mock-up with respect to seismic loading using finite element method software. In this master thesis, the finite element method software Diana is used to asses and predict the dynamic behavior of the scaled mock-up with respect to seismic loading.Structural MechanicsStructural EngineeringCivil Engineering and Geoscience
A fundamental study on mechanical & physical properties of polymer-modified self-healing mortars using bacteria
No full textA polymer-modified self-healing mortar is a mixture of Portland cement, water, sand, polymer and self-healing material. The polyacrylic ester emulsion (PAE) is used as polymer and as self-healing material bacterial spores from genus Bacillus + calcium lactate is used. The reason why this type of bacteria is used as a component of self-healing material is because of the high alkaline environment inside the mortar. A mortar has a pH value of between 9 and 11. As far as known, only this kind of bacteria can be used as a self-healing agent for mortars. Why a polymer-modified self-healing mortar? This polymer- modified self-healing mortar has an autonomous self-healing mechanism with, a high workability, a high flexural strength and also a high adhision. The experiments that has been performed in this study show that a polymer- modified self-healing mortar is a strong material with and active self-healing. This bacterial self-healing mechanism can heal cracks up to 0.46mm in contrast to the autogenous self-healing (of conventional mortar) of cracks up to 0.18mm. Beside this the fresh mortar showed a high workability. These properties make the polymer-modified self-healing mortar a strong and a more durable mortar. This concept can also be used to produce polymer-modified self-healing concrete.Materials and EnvironmentCivil Engineering and Geoscience
Essay : The hologenome theory of evolution
No full textDe begeleider en/of auteur heeft geen toestemming gegeven tot het openbaar maken van de scriptie.
The supervisor and/or the author did not authorize public publication of the thesis.
Research Report 2 : Analysis of replication stress in genomically instable cancers
No full textDe begeleider en/of auteur heeft geen toestemming gegeven tot het openbaar maken van de scriptie.
The supervisor and/or the author did not authorize public publication of the thesis.
Conception et étude numérique d'un ventilateur centrifuge soufflant dans l'entrefer d'un moteur électrique ultra-compact et ultra-rapide
No full textLe projet e-MECA : electro-Mécanique Embarquée à Compacité Améliorée, dont l'objectif est de concevoir une machine ultra compacte et ultra rapide à une puissance utile de 12Kw, trouve son application dans les véhicules mild et full hybrides. Ce type de machine présente en effet un fort potentiel de déploiement industriel en très grandes séries à des prix abordables. Pour ces machines, les pertes de charge liées aux écoulements dans le jeu ainsi que la connaissance de la distribution du transfert de chaleur constituent des enjeux essentiels pour les constructeurs. La présente étude porte sur le moyen de refroidissement des machines électriques ultra-compactes et ultra-rapides (5 ; 0rpm). D'un point de vue thermique, la problématique apparaît à vitesse basse, à 20000 rpm. Afin d'éviter ce point critique et de ne pas dépasser 180°C, il faudrait un débit de 2,5 X 10^-3 m^3.s^-1 avec un coefficient de transfert thermique h = 550W.m^-2.K^-1 sur l'extérieur de la machine
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