by Ho Tsz-Yan, Rebecca. / Thesis (M.Mus.)--Chinese University of Hong Kong, 1998. / Abstract also in Chinese. / Chapter Part I: --- p.page / Chapter ´Ø --- Abstract --- p.1 / Chapter Part II: / Chapter ´Ø --- "Analysis on ""Conversation""" --- p.3 / Chapter ´Ø --- """Conversation"" (Full Score)" --- p.6 / Chapter ´Ø --- "Analysis on ""Dark Haze´ح" --- p.25 / Chapter ´Ø --- """Dark Haze"" (Full Score)" --- p.28 / Chapter ´Ø --- "Analysis on ""San-Shui Xi-Nan""" --- p.65 / Chapter ´Ø --- """San -Shui Xi-Nan"" (Full Score)" --- p.69 / Chapter Part III： / Chapter ´Ø --- Biography --- p.119

The goal of this research is to show the feasibility of detecting density variations in green-state powder metallurgy (P/M) compacts from surface voltage measurements. By monitoring a steady electric current flow through the sample and recording the voltages over the surface, valu-able information is gathered leading to the prediction of the structural health of the compacts. Unlike prior research that concentrated on the detection of surface-breaking and subsurface de-fects, the results presented in this thesis target the density prediction throughout the volume of the sample. The detection of density variations is achieved by establishing a correlation between the conductivity and their respective density. The data obtained from the surface measurements is used as part of an inversion algorithm, calculating the conductivity distribution, and subse-quently the density within the compact. In a first step, the relationship between conductivity and density of green-state P/M com-pacts was investigated. Tests were conducted for a number of parts of various powder mixtures. In all cases a clear correlation between conductivity and density could be established, indicating that measurements of electric conductivity could indeed be exploited in an effort to render valid information about the density of the sample under test. We found a linear correlation for non-lubricated parts and a non-linear behavior for lubricated samples. Specifically, it was found that the conductivity increases with increasing density only up to a maximum value obtained at ap-proximately 6.9g/cm3. Interestingly, any additional density increase leads to a reduction of the conductivity. This behavior was confirmed to be inherent in all powder mixtures with lubricants. The thesis research is able to provide a physical model and a mathematical formulation describ-ing this counter-intuitive phenomenon. A finite element solver in conjunction with an inversion algorithm was then implemented to study arbitrarily shaped part geometries. Based on the principles of electric impedance imag-ing, the developed algorithm faithfully reconstructs the density distribution from surface voltage measurements. The feasibility of the instrumentation approach for both simple and complex parts can be demonstrated using a new sensor concept and measurement arrangement. Measurements were performed on both geometrically simple and complex parts.

Cette thèse traite des processus psychiques en jeu lors de l’éveil de coma, nommés par l’auteur travail de l'éveil.Elle s’appuie sur une expérience de travail clinique auprès de patients, pendant la période de coma et lors de leur éveil, sur la durée de leur hospitalisation en réanimation adulte.Elle propose de penser le coma et l'éveil comme processus, et non comme état, engendrant des mouvements psychiques et corporels, nécessitant un accompagnement constant et ne pouvant être pensés hors des lieux dans lesquels ils se déroulent. En découle une construction théorico-clinique d’une méthodologie du positionnement du psychologue clinicien chercheur dans une unité de soin somatique très médicalisée.Dans ce travail, il est question de la reprise des processus de symbolisation lors de l'éveil du patient dans un processus d'échoïsation au fonctionnement du service.Le modèle ainsi dégagé souligne la nécessité de penser l'éveil de coma sous l'angle de la subjectivité et de l'intersubjectivité, au travers de la rencontre et du tressage des éléments somatiques, psychiques et énergétiques, sur la scène d’un service de réanimation, et ouvre sur trois voies : l’éveil, l’état végétatif chronique et ses différentes déclinaisons, ou la mort.Le coma est ici considéré comme faisant partie du parcours du patient, de son histoire de vie, et non comme une rupture de la continuité.Le modèle proposé attire particulièrement l’attention sur la question des stimuli, de l’historicisation, du délire, du fond hallucinatoire du psychisme et du rapport à l’autre dans sa dimension de sujet comme vecteurs de l’éveil dans une double composante : éveil vers la vie ou éveil vers la mort. / This thesis adresses the psychic processes that take place during the awakening from coma, named by the author “Work of awakening”. It is based on a work experience in a clinic, with patients in a state of coma and in the phase of their awakening, during their hospitalization period in adult intensive care. It proposes to think the coma and the awakening as a process, and not as a state, that can generate psychic and physical movements, that necessitate a constant assistance and that cannot be thought outside the places where they happen. From there can be elaborated a theoretical and clinical methodology of the role of the clinical psychologist researcher in a very medicalized unit of somatic care.This work deals with the re-start of processes of symbolisation during the awakening, in a an echoing process to the functionning of the departement. The model proposed in this work therefore underlines the necessity to consider the awakening from coma from a subjective and intersubjective point of view, through the meeting and the linking of somatic, psychic and energy elements during the reanimation. It opens to three possible paths : the awakening, the chronic vegetative state and its various declinations, or death. Coma is considered here as part of the patient’s life and not as a rupture in continuity. The model proposed draws attention in particular to the issues of stimuli, of historicisation, of delirium, of the hallucinatory depth of psychism and of the relation to the other in its dimension of subject, as vectors to the awakening either towards life or death.

Cette thèse propose de procéder à une histoire des parties du discours dans la grammaire germanophone entre le XVIIe et le début du XIXe siècle afin de mettre en évidence certaines spécificités de la description grammaticale allemande. En tant que structure pérenne de la réflexion linguistique occidentale, les parties du discours constituent, en effet, un lieu d’observation privilégié pour mettre en évidence les analogies et des divergences que peut présenter le discours grammatical germanophone vis-à-vis de celui d’autres traditions linguistiques. Certains traitements ou tendances descriptives particulières peuvent ainsi être dégagés et inscrits dans l’histoire de la grammaire allemande et plus largement européenne, ce qui invite alors à considérer plus attentivement les choix descriptifs ou les positions théoriques présidant à leur élaboration. Si la spécificité de l’idiome décrit intervient alors de manière déterminante sur le cadre descriptif, certaines initiatives de la deuxième moitié du XVIIIe siècle reposent aussi sur l’adoption d’une approche descriptive multicritérielle qui témoigne de l’élaboration d’une réflexion syntaxique sur les catégories grammaticales. Ces descriptions, qui présentent parfois des innovations remarquables dans l’histoire de la grammaire, peuvent ainsi être considérées comme participant, à plusieurs égards, du tournant syntaxique allemand qui se réalise dans le premier tiers du XIXe siècle et sont donc susceptibles d’en révéler certains des fondements. / This thesis aims to establish a history of the parts of speech in German grammar between the seventeenth and the early nineteenth centuries in order to highlight certain characteristics of the ways German grammar was described. A study of the parts of speech —which are a foundational feature of Western linguistic thought— provides an opportunity to highlight the ways German grammatical discourse is different from, or analogous to, other linguistic traditions. The descriptive trends and processes which emerge from this study can be positioned within the history of German grammar and more broadly within the history of other European grammars. This leads us to consider in more detail the descriptive choices and the theoretical viewpoints governing the development of these grammars. Although the specific features of the German language play a decisive role in the choice of a descriptive model, some initiatives in the second half of the eighteenth century adopt a multi-criterion approach to description, where grammatical categories are established through syntactic analysis. These multi-criterion descriptions, which sometimes present remarkable innovations in the history of grammar, can be seen as contributing to the change in German syntax that takes place in the first third of the nineteenth century. They therefore can reveal certain roots of this turning point in the history of German grammar.

<p>The wind power industry is maturing and the amount of electricity produced by wind turbines in the world is rapidly increasing every year. Service and maintenance of wind turbines has proven to be difficult and expensive, especially offshore. A well coordinated support organisation and optimized maintenance strategies are required to effectively reduce the costs associated with WT support, where cost-efficient supply and storage of spare parts are important. The aim of this thesis is to model spare part logistics for wind turbines to analyse different strategies and compare the profitability. Optimal stock levels and reorder sizes have been calculated with the software tool OPUS10. Wind turbine and spare part data have been provided by Vattenfall Vindkraft AB and field studies were made to the wind farms Lillgrund and Horns Rev to gather information.</p><p>Our analyses show that different spare part strategies only affect a minor part of the total support costs generated for a wind farm. Still there are many improvements possible and money to be saved if using an optimal spare part strategy instead of one based on personal experiences and intuition. For a large wind power system, including a number of wind farms with the same wind turbine types, we also show convincing results that pooling of spare parts are a much more cost-efficient spare part strategy compared to local storage and handling only. Using a central depot for spare part reordering and storage of critical spare parts, such as gearboxes, generators and blades, are more profitable</p>

The perfectly matched layer (PML) is a novel technique to simulate the absorption of waves in unbounded domains. The underlying equations are often a system of second order hyperbolic partial differential equations. In the numerical treatment, second order systems are often rewritten and solved as first order systems. There are several benefits with solving the equations in second order formulation, though. However, while the theory and numerical methods for first order hyperbolic systems are well developed, numerical techniques to solve second order hyperbolic systems are less complete. We construct a strongly well-posed PML for second order systems in two space dimensions, focusing on the equations of linear elasto-dynamics. In the continuous setting, the stability of both first order and second order formulations are linearly equivalent. We have found that if the so-called geometric stability condition is violated, approximating the first order PML with standard central differences leads to a high frequency instability at most resolutions. In the second order setting growth occurs only if growing modes are well resolved. We determine the number of grid points that can be used in the PML to ensure a discretely stable PML, for several anisotropic elastic materials. We study the stability of the PML for problems where physical boundaries are important. First, we consider the PML in a waveguide governed by the scalar wave equation. To ensure the accuracy and the stability of the discrete PML, we derived a set of equivalent boundary conditions. Second, we consider the PML for second order symmetric hyperbolic systems on a half-plane. For a class of stable boundary conditions, we derive transformed boundary conditions and prove the stability of the corresponding half-plane problem. Third, we extend the stability analysis to rectangular elastic waveguides, and demonstrate the stability of the discrete PML. Building on high order summation-by-parts operators, we derive high order accurate and strictly stable finite difference approximations for second order time-dependent hyperbolic systems on bounded domains. Natural and mixed boundary conditions are imposed weakly using the simultaneous approximation term method. Dirichlet boundary conditions are imposed strongly by injection. By constructing continuous strict energy estimates and analogous discrete strict energy estimates, we prove strict stability.

No description available.

The wind power industry is maturing and the amount of electricity produced by wind turbines in the world is rapidly increasing every year. Service and maintenance of wind turbines has proven to be difficult and expensive, especially offshore. A well coordinated support organisation and optimized maintenance strategies are required to effectively reduce the costs associated with WT support, where cost-efficient supply and storage of spare parts are important. The aim of this thesis is to model spare part logistics for wind turbines to analyse different strategies and compare the profitability. Optimal stock levels and reorder sizes have been calculated with the software tool OPUS10. Wind turbine and spare part data have been provided by Vattenfall Vindkraft AB and field studies were made to the wind farms Lillgrund and Horns Rev to gather information. Our analyses show that different spare part strategies only affect a minor part of the total support costs generated for a wind farm. Still there are many improvements possible and money to be saved if using an optimal spare part strategy instead of one based on personal experiences and intuition. For a large wind power system, including a number of wind farms with the same wind turbine types, we also show convincing results that pooling of spare parts are a much more cost-efficient spare part strategy compared to local storage and handling only. Using a central depot for spare part reordering and storage of critical spare parts, such as gearboxes, generators and blades, are more profitable

No description available.

This research project is partnership project involving industrial, university and government collaborators. The overall objective is to develop and enhance tools for use in Resin Transfer Moulding (RTM) design technology in order to re-design existing metallic parts using composite materials. / The specific objective of this work is to present preliminary research findings of the development of an optimized design of a leading edge slat (horizontal stabilizer component) from the Bell Model 407 Helicopter. The results presented here focus on the static stress analysis and the structure design aspects. The findings will serve as a basis for future design optimization as well as further developments in the use of RTM technology in re-designing metallic aeronautic components and can be considered to be "semi-optimized". / This research is based on extensive finite element analysis (FEA) of several composite material configurations, with a comparison made with the original metallic design. Different key criteria of the part design such as ply lay-up, bracket geometry, angle and configuration are tested using FEA technology with the objective of selecting the design which is minimizing stress concentrations. The influence of the modification of model-related parameters was also studied. / Preliminary comparative studies show that the slat configuration with half brackets opened towards the inside with an angle of 70 degrees (angle between the top of the airfoil and the side of the bracket) is the best option according to minimum stress concentration and structural flexibility. This choice is confirmed by other factors such as material savings and ease of processing.