Magíster en Ciencias de la Ingeniería, Mención Transporte / Ingeniero Civil / El prop ósito de este trabajo es el estudio de los efectos de una inversi ón en capacidad vial analizando en detalle dos relevantes aristas. En primer lugar, estudiar las consecuencias en los costos generalizados asociados a los modos disponibles. Un importante objetivo de esta primera parte es el an álisis de la veracidad de la paradoja de Downs-Thomson y la b úsqueda de las variables principales que determinan la existencia de esta hip ótesis. En segundo lugar, estudiar el benefi cio social de aumentar la capacidad vial, tanto en ausencia como en presencia de otras pol íticas urbanas para combatir la congesti ón. El objetivo principal de esta tesis es obtener conclusiones que permitan entregar recomendaciones sobre pol íticas de transporte. Para esto, se utiliza un modelo donde la demanda de viajes totales es sensible a cambios en los precios y tiempos de viajes. Específi camente el modelo es caracterizado por dos per íodos de viaje, el transporte p úblico y privado son sustitutos y existe congesti ón cruzada entre ambos modos. El estudio se basa en la extensi ón del modelo microecon ómico de equilibrio parcial de Basso y Silva [2014], quienes modelan las decisiones de los usuarios junto con las decisiones de los operadores del servicio p úblico y pol íticas urbanas en decisi ón del plani ficador. En este estudio se simula escenarios tomando datos de la ciudad de Londres y con esto se analiza la efi ciencia de invertir en capacidad vial en condiciones normales de tr áfico mixto. Adem ás se compara su efi ciencia con otras pol íticas como dedicaci ón exclusiva de buses, tari ficaci ón por congesti ón, subvención al transporte p úblico y combinaciones entre estas. De este estudio se desprenden dos resultados principales. Una primera conclusión es que en la mayor ía de los escenarios analizados la paradoja de Downs-Thomson no se cumple debido a la consideraci ón de un modelo de demanda con sustitutos imperfectos (hip ótesis expuesta en Basso y Jara-D az [2012]) y a la congesti ón presente la cual genera que la curva de costo generalizado del transporte p úblico no sea siempre decreciente. Un segundo resultado principal es que en t érminos de e ficiencia los resultados muestran que en una situaci ón urbana altamente congestionada (tráfico mixto), la capacidad del sistema de transporte público, en particular de su cuello de botella, los paraderos de buses, son fundamentales. La mejora gradual de este sistema abrir á el camino a utilizar polí ticas de gesti ón (ví as exclusivas) y de precios (subsidios y tarifi cación por congesti ón) en lugar de grandes expansiones de capacidad vial para reducir la congesti ón. Esto se traduce en que en un marco de an álisis de costo-bene ficio estricto para solucionar la congesti ón, se debe tomar en cuenta las consecuencias en nivel de congesti ón de la polí tica a implementar y no el grado de congesti ón presente.

La mise en œuvre des réfrigérateurs à dilution implique la consommation d'4He liquide. Ces réfrigérateurs ne sont pas autonomes et leur utilisation devient ainsi contraignante et onéreuse lorsque les laboratoires ne disposent pas de système de reliquéfaction.<br />A la fin des années 1990, les tubes à gaz pulsé bi-étagés commerciaux ont atteint des performances telles, que l'idée de les utiliser à la place des bains d'4He classiques commençé à émerger. Quelques prototypes de laboratoire furent ainsi développés, dont un exemplaire commercialisé par l'Air Liquide en collaboration avec le CNRS-CRTBT.<br />Cette thèse, réalisée au CRTBT et cofinancée par l'Air Liquide, a permis d'étudier le couplage d'un réfrigérateur à dilution avec un tube à gaz pulsé afin de réaliser un appareil commercial offrant des performances comparables, en volume expérimental et puissance froide, aux réfrigérateurs classiques de moyenne puissance.<br />Dans un premier temps, nous avons porté notre attention sur la réalisation du cryostat. L'absence de fluides cryogéniques permettant la thermalisation homogène des diverses entités, ainsi que la puissance frigorifique limitée par les performances du tube à gaz pulsé et les vibrations générées par ce dernier constituaient les principales caractéristiques de notre étude.<br />Nous avons réalisé un cryostat offrant un volume expérimental de 750 mm sur un diamètre de 200 mm. Le temps de prérefroidissement est de 12 heures entre 300 K et 4,2 K.<br />Dans un second temps, nous avons étudié l'intégration du réfrigérateur à dilution.<br />Le prérefroidissement de l'injection d'3He entre 300 K et 4,2 K nous a amenés à développer un système de thermalisation spécifique permettant d'optimiser l'utilisation des ressources du tube à gaz pulsé. Ce développement a abouti à un brevet CNRS-Air Liquide. <br />Le prérefroidissement entre 4,2 K et la température de l'évaporateur a constitué un travail important concernant l'étude du principe de refroidissement par échangeurs Joule-Thomson.<br />Nous avons ainsi atteint des températures inférieures à 10 mK et obtenu des débits de circulation allant de 90 à 200 micromoles par seconde avec des temps de condensation de l'ordre de 2 heures pour un réfrigérateur à deux échangeurs discrets.

The primary purpose of this study is to provide a transcription for solo organ of Virgil Thomson's Symphony on a Hymn Tune. The study is two-fold: first, to explore the early life and career of Thomson with a focused view on how his organ and composition studies influenced the composition of Symphony on a Hymn Tune; and second, to present an original transcription of the work in a performing score for solo organ. In addition to the final score, the study provides an analytical overview along with a description of methodology used to create the transcription, and a discussion of issues encountered by the performing organist in playing the transcription. Discussions encompass organ registration, tempi, manual suggestions, articulation, phrase markings, and dynamic expression. Musical examples both from the author's transcription and Virgil Thomson's organ works are included as necessary. Two appendices are included. Appendix 1 presents the specifications for the Aeolian Skinner organ of The Southern Baptist Theological Seminary in Louisville, Kentucky, on which the transcription was originally performed. Appendix 2 itemizes the registration lists used for the original performance of the organ transcription.

The thesis explores how elemental architecture in collaboration with the Shield can manifest a threshold condition in which a modern day hero myth can be enacted in the Canadian wilderness. Through the lens of Joseph Campbell, Tom Thomson and the archetypal structures of the Finns and Algonkians, a design proposal is derived for a Waterway Park in the Algonquin region that expands the mandate of the Ontario Parks System. In the realm of psychology, Carl Gustav Jung defines individuation as a universal quest that encourages facing and overcoming ones internal demons in order to live a more integrated existence. Located in Oxtongue River Ragged Falls Provincial Park, this proposed experimental pilgrimage retreat connects a series of primary and secondary paths to cabins, a sweat lodge and a chapel. This model illustrates a method of inhabiting a protected wilderness site that can be applied to existing and future Parks to inspire a condition of corporeal and spiritual rejuvenation in Ontario’s near North.

The thesis explores how elemental architecture in collaboration with the Shield can manifest a threshold condition in which a modern day hero myth can be enacted in the Canadian wilderness. Through the lens of Joseph Campbell, Tom Thomson and the archetypal structures of the Finns and Algonkians, a design proposal is derived for a Waterway Park in the Algonquin region that expands the mandate of the Ontario Parks System. In the realm of psychology, Carl Gustav Jung defines individuation as a universal quest that encourages facing and overcoming ones internal demons in order to live a more integrated existence. Located in Oxtongue River Ragged Falls Provincial Park, this proposed experimental pilgrimage retreat connects a series of primary and secondary paths to cabins, a sweat lodge and a chapel. This model illustrates a method of inhabiting a protected wilderness site that can be applied to existing and future Parks to inspire a condition of corporeal and spiritual rejuvenation in Ontario’s near North.

Since 2004, table-top laser-plasma accelerators (LPAs) driven by ˜30fs terwatt laser pulses have produced colimated, nearly mono-energetic eletron bunches with energy up to 1 GeV in laboratories around the world. Large-scale computer simulations show that LPAs can scale to higher energy while retaining high beam quality, but will require laser pulses of higher energy and longer duration than current LPAs. The group of Prof. Mike Downer, in collaboration with the Texas Petawatt (TPW) laser team headed by Prof. Todd Ditmire, is setting up an experiment that uses the TPW laser (1.1 PW, 150 fs) to drive the world’s first multi-GeV LPA. This thesis provides a general overview of the TPW-LPA project, including several diagnostic systems for the beam, plasma and laser pulse. Special attention is given to three of the diagnostic systems: (1)A transverse interferometry diagnostic of the plasma density profile created by the TPW laser pulse; (2)A Thomson scattering diagnostic of the self-guided path of the TPW laser pulse through the plasma; (3)An optical transition radiation diagnostic of the accelerated electron bunch exiting the plasma. In each case, basic principles, theoretical background, calculation and simulation results, and preliminary experimental results will be presented. / text

Thesis (Ph. D.)--University of Chicago, Dept. of English Language and Literature, June 1999. / Includes bibliographical references. Also available on the Internet.

Thesis (MA)--Macquarie University (Division of Humanities, Department of English), 2006. / Submitted in fulfilment of the requirements for the degree of Masters in English in the Division of Humanities, Dept. of English, 2006. Bibliography: p. 199-210.

Thesis (D. Min.)--Erskine Theological Seminary, 1996. / Abstract. Includes bibliographical references (leaves 139-142).

Thesis (Ph.D.) - University of Queensland, 2004. / Includes bibliography.