Based on a refined analytical anisotropic thin-walled beam model, aeroelastic instability, dynamic aeroelastic response, active/passive aeroelastic control of advanced aircraft wings modeled as thin-walled beams are systematically addressed. The refined thin-walled beam model is based on an existing framework of the thin-walled beam model and a couple of non-classical effects that are usually also important are incorporated and the model herein developed is validated against the available experimental, Finite Element Anaylsis (FEA), Dynamic Finite Element (DFE), and other analytical predictions. The concept of indicial functions is used to develop unsteady aerodynamic model, which broadly encompasses the cases of incompressible, compressible subsonic, compressible supersonic and hypersonic flows. State-space conversion of the indicial function based unsteady aerodynamic model is also developed. Based on the piezoelectric material technology, a worst case control strategy based on the minimax theory towards the control of aeroelastic systems is further developed. Shunt damping within the aeroelastic tailoring environment is also investigated. The major part of this dissertation is organized in the form of self-contained chapters, each of which corresponds to a paper that has been or will be submitted to a journal for publication. In order to fullfil the requirement of having a continuous presentation of the topics, each chapter starts with the purely structural models and is gradually integrated with the involved interactive field disciplines. / Ph. D.

Afin de générer des plasmas performants sur de longues durées, un tokamak nécessite des dispositifs de chauffage et de génération de courant additionnels. Des antennes haute-fréquences, délivrant des puissances de plusieurs mégawatts au plasma, sont actuellement utilisées dans de nombreux tokamaks. Pour optimiser les performances de chauffage et de génération de courant obtenues avec le système LH (fréquence de quelques gigahertz), une bonne maitrise du couplage de l'onde émise par l'antenne au plasma de bord est nécessaire. Or, des effets non-linéaires dépendant du niveau de puissance HF injectée dans le plasma perturbent fortement le couplage de l'onde LH pour certains paramètres de bord (densité et température en particulier). Les travaux présentés dans ce manuscrit portent sur l'étude du couplage linéaire et non-linéaire de l'onde LH au plasma de bord. Dans le cadre de l'installation d'une antenne dite « Passive Active Multijunction » en 2009 sur le tokamak Tore Supra visant à tester le système LH proposé pour ITER, la caractérisation du couplage obtenu avec cette antenne a été réalisée à partir d'expériences menées à basse puissance sur Tore Supra. Les résultats, analysés conjointement avec l'utilisation d'un code de couplage (ALOHA), ont ainsi validé les prédictions théoriques prévoyant de bonnes propriétés de couplage à des densités de plasma de bord faibles. Par ailleurs, l'effet pondéromoteur a été clairement identifié comme responsable de la forte détérioration du couplage de l'onde mesurée sous certaines conditions de plasma de bord. / In order to achieve long pulse operation with a tokamak, additional heating and current drive systems are necessary. High frequency antennas, which deliver several megawatts of power to the plasma, are currently used in several tokamaks. Moreover, a good control of the coupling of the wave launched by the antenna to the edge plasma is required to optimize the efficiency of heating and current drive LH systems. However, non-linear effects which depend on the level of injected power in the plasma strongly damage the coupling of the LH wave at particular edge parameters (density and temperature profiles). Results presented in the manuscript deal with the study of the linear and non-linear coupling of the LH wave to the plasma. In the framework of the commissioning of the Passive Active Multijunction antenna in 2009 on the Tore Supra tokamak aiming at validating the LH system suggested for ITER, the characterisation of its coupling properties was realized from low power experiments. The experimental results, which are compared with the linear coupling code ALOHA, have valided the theoretical predictions of good coupling at edge plasma density around the cut-off density. Besides, the ponderomotive effect is clearly identified as responsible for the deterioration in the coupling of the wave, which is measured under particular edge plasma conditions. A theoretical model combining the coupling of the LH wave with the ponderomotive force is suggested to explain the experimental observations.

Darbo problema: Laisvalaikis nuolat besikeičiantis, vienas iš visuomenės ekonominio ir socialinio vystymo rodiklių. Visos bendros laisvalaikio problemos yra neišvengiamai susijusios su visuomenės vystymosi tendencijomis, urbanizacija, mokslo ir technikos pasiekimais. Šiuolaikiniame technologijų amžiuje fizinis aktyvumas, studentų tarpe ženkliai mažėja. Aktyvias laisvalaikio praleidimo formas vis dažniau pakeičia pasyvios: kompiuteris, televizija, naujos susisiekimo priemonės. Nauji mokslo ir technikos laimėjimai pasiekė ir studentus gyvenančius provincijoje, todėl aktyvus laisvalaikis taip pat sumažėjo, o fizinės ypatybės susijusios su judėjimo galimybėmis nėra tokios geros. Mažėjant aktyviam laiko leidimui, mažėja ir fizinis pajėgumas. Darbo tikslas - apibūdinti laisvalaikio praleidimo ypatumus Sportinės rekreacijos ir turizmo programos studentų tarpe. Uždaviniai: 1. Apibūdinti pagrindines laiko struktūras, laisvalaikio sampratą, laisvalaikio sąsajas su rekreacija. 2. Atskleisti laisvalaikio praleidimo ypatumus ir būdus studentų tarpe. 3. Ištirti Lietuvos sporto universiteto Sportinės rekreacijos ir turizmo programos studentų laisvalaikio praleidimo ypatumus. Darbo objektas: Sportinės rekreacijos ir turizmo programos studentų laisvalaikis. Tyrimo metodai: Mokslinės literatūros analizė, anketinė apklausa, aprašomoji statinė analizė. Pagrindinės išvados: Remiantis tyrimo duomenimis, galima daryti išvadą, kad Lietuvos sporto universiteto, Sportinės reakreacijos ir turizmo... [toliau žr. visą tekstą] / Job objective – The description of leisure features of occupation programs of sport recreation and tourism among students. Tasks: 1. To describe the main structures of time, the conception of leisure time and the links of leisure with recreation. 2. To reveal features of spending leisure time among students. 3. To survey the features of spending leisure of students of sport recreation and tourism program of Lithuanian sport university. Job object: Leisure of the students of sport recreation and tourism. Survey methods: literary analysis, analysis of data collection, questionnaire and descriptive statistics. According to the research, it can be concluded that the Lithuanian University of Sport, Sport recreation and tourism specialty students understands leisure as time, which can be used for yourself or as recreation - time for spiritual regeneration and relaxation. It was found that the majority of the surveyed students have enough free time, appointed for leisure and most of the time only for themselves. The main factors influencing students' leisure activities, namely: personal interests and financial / economic situation. It can be concluded that the students' desires for leisure activities in a variety of prevents to choose limited financial resources, because the majority of respondents give too little money for productive leisure. The analysis of Lithuanian University of Sport, Sport recreation and tourism of students leisure activities, can be said that the majority... [to full text]

This thesis explores the role and effectiveness of police authorities in connecting policing and the citizen and in increasing the citizen's involvement in the delivery of their policing service. The thesis examines: police authorities in the context of citizenship and in relation to accountability; and whether the operational function of law enforcement, the original charge of Keeping the Kings Peace and policing by consent - can work homogenously within a system characterised by both active and passive citizenry. Individual chapters discuss whether police authorities have sufficient power, whether the home secretary and chief constable have too much power, and the propensity of police authorities to demand answers and call the police service to account. As history shows, it is possible to have a police service carrying out policing functions in the absence of a police authority performing a scrutiny function; but it would be impossible to have a police authority without a police service. Therefore, the thesis argues that the added value, the relevance and the effectiveness of police authorities needs to be unambiguous.

<p> Inland degradational trends of coastal dolomite pavements (on the Amabel formation near Tobermory Ontario Map 1) were examined in three wave energy settings: passive, intermediate, and active shores. </p> <p>Six pavement property trends were examined to determine the effect of low fetch lengths (7-10 km - Ford 83) and long shallow wave approach (Map 1) on the break-up of passive coastal pavements (south-west Bear's Rump Island): vegetation cover , grike dimensions, fracturing, pitting, shattering and flaking, and soil and rubble depths. </p> <p> Detailed analysis of small scale surface solution features, "karren", was undertaken at five 1 m sample grids on the intermediate average fetch 70-90 km -Grosset 85) Cyprus Lake provincial park pavements. </p> <p> / Thesis / Bachelor of Arts (BA)

L'injection d'un mélange carburant/comburant dans une chambre de combustion d'un turboréacteur ou d'un moteur-fusée fait intervenir un jet liquide, cisaillé par un gaz rapide. Le jet liquide peut être sous certaines conditions sujet à un phénomène de battement à grande échelle. Ce phénomène, dont les mécanismes de base sont aujourd'hui mal connus, peut avoir des conséquences importantes sur la combustion. Nous réalisons dans ce travail une étude numérique de jets liquides cisaillés par une phase rapide, en portant une attention particulière à l'étude de l'interaction entre les structures tourbillonnaires de la phase rapide et le jet liquide. Une nappe liquide plane cisaillée de part et d'autre par une phase rapide est analysée dans un premier temps . Les mécanismes de déstabilisation de cette nappe liquide sont étudiés, ainsi que le contrôle passif du phénomène de battement. Des jets liquides coaxiaux, cisaillés par une couronne de phase rapide, sont ensuite analysés. Les mécanismes de déstabilisation à grande échelle sont étudiés, ainsi que le contrôle passif et actif de cette déstabilisation. La simulation d'une configuration d'écoulement réaliste eau/air est enfin réalisée, en interaction avec les expérimentateurs du LEGI. Une attention particulière est portée à l'écoulement se produisant au sein de la buse d'injection. / Fuel injection in an aircraft engine or in a rocket engine involves a liquid jet sheared by a high-velocity gas. The liquid jet can display, under some specific conditions, a flapping motion. This flapping motion, the basic mechanisms of which are still poorly understood, can significantly impact the combustion process. We perform in this work a numerical study of liquid jets interacting with a high-speed stream and focus on the interactions between the vortical structures in this high-speed stream and the liquid jet. A plane liquid jet surrounded by two high-speed streams is first analysed. The mechanisms leading to the flapping motion are studied, as well as the passive control of this instability. A liquid coaxial jet, sheared by an annular high speed stream, is next analysed. The mechanisms leading to the flapping motion are also analysed, as well as passive and active strategies for controlling this instability. Finally, we perform simulations of an experimental set-up studied at LEGI, focusing on the flow inside the nozzle.