Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 211-214).

Thesis (M.S.)--University of Michigan, [1962].

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 254-257).

Thesis (M. S.)--Florida State University, 2006. / Advisor: Mark A. Bourassa, Florida State University, College of Arts and Sciences, Dept. of Meteorology. Title and description from dissertation home page (viewed June 12, 2006). Document formatted into pages; contains ix, 43 pages. Includes bibliographical references.

L’électrification croissante des véhicules militaires va de pair avec la révolution « électrique » de ces dernières décennies. Aujourd’hui un véhicule militaire intègre plus de 120 consommateurs électriques. Cette évolution de l’électrification est également accompagnée de l’apparition de nouvelles fonctions comme le déplacement du blindé en mode furtif, animé grâce à une motorisation électrique. Dans ce contexte nous proposons de pré-dimensionner les différentes sources d’énergie du véhicule (dispositif de stockage, moteur, générateur, convertisseur). La transmission électrique est de type hybride parallèle mono-axe, l’arbre de sortie de la machine électrique est confondu avec l’arbre de sortie du moteur thermique. Ce choix est identique au prototype de véhicule blindé actuellement en étude. L’originalité des travaux repose sur le développement d’un modèle de l’emploi du véhicule pour sa phase d’utilisation la plus sensible, à savoir le combat de haute intensité. Ce modèle basé sur la matrice de Markov permet de générer aléatoirement de très nombreuses missions à partir d’une base de données enregistrée lors d’exercices d’entraînement au combat de haute intensité. Une seconde originalité réside dans la méthode de pré-dimensionnement proposée, associant le modèle d’emploi (statistique) aux modèles des flux de puissances décrivant le comportement du blindé. Le pré-dimensionnement obtenu est donc optimisé par rapport aux missions potentiellement réalisables par le véhicule. / Following the example of the civil automotive sector, the electrification of military vehicles has widely increased during the last decades. Today, a military armoured vehicle embeds more than 120 electrical consumers. New functionalities has appeared like the hybrid electrical propulsion mode that allows stealthy moves. In this context, we propose to size the different components of the electrical propulsion such as the electric motor/alternator, storage device, electronic power converter. The propulsion selected is of parallel hybrid type. The rotary shaft of the electric motor is of the same as the combustion engine’s. This choice is similar to an armoured vehicle prototype under development today. The first original contribution of this research is the design and the use of a predictive model for a mission scenario. This model has been developed for the most critical phase, which is the high intensity engagement. This model is based on a Markov matrix, that allows to produce a lot of different missions through a random process. Input data have been recorded during several high intensity combat real training sessions. A second original contribution is the calculation method proposed. It combines the statistical modelling of the missions with the modelling of the power flows that describe the vehicle behaviour. So, the results obtained are optimized with regard to the extended field of the possible vehicle missions.

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L’objectif est d’étudier les propriétés optiques de formulations composites et leur évolution durant leur photopolymérisation. Une attention particulière est portée au phénomène de diffusion de la lumière engendré par la présence de charges d’indice de réfraction différent de celui de la matrice organique. Des relations indice-conversion sont établies pour des systèmes non chargés à partir des suivis cinétiques de l’évolution de l’indice de réfraction par réfractométrie et de la conversion par spectrométrie IR réalisés pour différentes compositions, température et intensité du rayonnement. L’étude des formulations chargées montre que la diffusion de la lumière est d’autant moins marquée que l’écart d’indice de réfraction entre charges et matrice est faible et la taille des particules est grande. Une modélisation basée sur un modèle à 4 flux décrivant l’évolution du rayonnement dans l’épaisseur de l’échantillon permet d’optimiser le mode opératoire le plus adapté au matériau visé. / The aim of this work is to study optical properties of loaded formulations and their variation during photopolymerization. This study is accentuated on light scattering phenomenon which is caused by presence of fillers having refractive index different from that of the organic matrix. Using real time monitoring of photopolymerization kinetics by IR spectroscopy and by refractometry, refractive index-conversion relationships are determined for unloaded systems of different compositions and at different temperatures and radiation intensities. Studying loaded formulations shows that light scattering is even less so pronounced as the difference in refractive index between fillers and matrix is lower and as the particle size is larger. Modeling based on four-flux theory was used to describe radiation evolution in terms of sample thickness in order to optimize the most appropriate operating procedure of the desired material.

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A study involving in-plant measurements, laboratory analysis and mathematical modelling was conducted to elucidate the kinetics of the zinc slag fuming process. The traditional assumption has been that the process operates at thermodynamic equilibrium. The results of industrial measurements at five different companies has demonstrated that this approach is not correct. Chemical assays of the slag show carbon levels in the range of 0.1 - 1.0% and char particles have been extracted from slag samples. Tuyere back-pressure measurements revealed that the predominant mode of gas injection behavior is bubbling. This evidence indicates that a portion of the coal injected into the furnace is entrained in the slag. A model of the direct coal particle-slag reaction was developed and incorporated into an overall model of the slag bath. This model included the behavior of the water-jacketed wall, a treatment of coal combustion in the tuyere gas stream, and a model of the entrained coal residence time. Fitting of the data to eleven industrial fuming cycles showed that the fraction of coal entering the bath was consistently about 35%. About 50% of the coal is combusted in the tuyere gas stream and 10% passes through the bath unconsumed. Calculated oxygen utilization ranged from 70-95%, dependent on slag depth. The slag fuming process is therefore kinetically controlled. There are essentially two critical parameters: the fraction of coal entrained in the slag, and the rate of ferrous iron oxidation. The rate of ferric reduction balances ferric inputs to the bath by displacing previously reduced zinc from the entrained coal-slag reaction bubbles. Process efficiency can be increased therefore by increasing entrainment of coal in the bath, perhaps by the use of high pressure injection, and by reducing ferrous iron oxidation. The latter objective may be achieved by more complete combustion of tuyere coal or pre-combustion. A significant control advantage might be gained by separating these two functions to different sets of tuyeres. In continuous fuming operations the model would suggest that improved efficiencies could be obtained by using a more coarsely ground coal, higher fixed carbon coals, and operating at intermediate temperatures. / Applied Science, Faculty of / Materials Engineering, Department of / Graduate