xiii, 119 p. : ill. (some col.) / Airstream brand travel trailers from the 1950s and 60s have developed a subculture dedicated to their preservation and use. This subculture serves as a case study for how nostalgia, defined in a postmodern context, may promote preservation and creative communion with the past. After examining criticisms of preservation’s focus on material integrity, the discussion focuses on the need to factor user-based relationships into historic preservation. A postmodern reexamination of nostalgia defines it not merely as a longing for the past but also as a form of social critique which seeks to mitigate modernity with the past. Mid-century Airstream preservation reflects a desire to revive specific, positive values of the past in order to ameliorate the future and form temporal continuity. For the mid-century Airstream subculture, nostalgia fosters both restoration and recreation, allowing for an iconic emblem of the past to function in the present rather than fade into obsolescence. / Committee in charge: Dr. Leland Roth, Chairperson; Elizabeth Carter, Member

This work deals with the measurement of temperature fields in the air using an infrared camera. The dissertation describes the opportunity of measuring the temperature field in the air and the characterization of the developed measuring method. In the next part there are introduced the beginning of thermography imaging and the field of usability of the new infrared measuring method. Further, the theoretical foundations of the thermography measuring method in the temperature fields in the air are described. In the theoretic background there are described the analysis of heat conduction in an auxiliary material, the determination of dynamic properties of the method and the analysis of radiation, which has an influence on infrared imagining. This method requires an insertion of the auxiliary material into the non-isothermal air flow, which can allow for the study of the temperature distribution in air. For effective visualization of temperature fields in the air using an infrared camera, the selection of the appropriate auxiliary material, on which the air temperature displays, is crucial. In the next part of the doctoral thesis, there is a description of static measuring properties of auxiliary materials. The usability range of the measuring method is determined from these properties. In the thesis there are presented the description of the device for the measurement of 2D temperature fields in the air and the description of the measuring device for 3D measurements of temperature fields in the air using an infrared camera, which can also be used for measurements of temperature fields in small enclosed spaces through a viewing window. For the practical use of the method, the detailed methodology of measuring temperature fields in the air by an infrared camera was developed and its applicability was demonstrated on practice examples. The developed measuring method can be used in many areas of research and in practice.

This work deals with the measurement of temperature fields in the air using an infrared camera. The dissertation describes the opportunity of measuring the temperature field in the air and the characterization of the developed measuring method. In the next part there are introduced the beginning of thermography imaging and the field of usability of the new infrared measuring method. Further, the theoretical foundations of the thermography measuring method in the temperature fields in the air are described. In the theoretic background there are described the analysis of heat conduction in an auxiliary material, the determination of dynamic properties of the method and the analysis of radiation, which has an influence on infrared imagining. This method requires an insertion of the auxiliary material into the non-isothermal air flow, which can allow for the study of the temperature distribution in air. For effective visualization of temperature fields in the air using an infrared camera, the selection of the appropriate auxiliary material, on which the air temperature displays, is crucial. In the next part of the doctoral thesis, there is a description of static measuring properties of auxiliary materials. The usability range of the measuring method is determined from these properties. In the thesis there are presented the description of the device for the measurement of 2D temperature fields in the air and the description of the measuring device for 3D measurements of temperature fields in the air using an infrared camera, which can also be used for measurements of temperature fields in small enclosed spaces through a viewing window. For the practical use of the method, the detailed methodology of measuring temperature fields in the air by an infrared camera was developed and its applicability was demonstrated on practice examples. The developed measuring method can be used in many areas of research and in practice.

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Avec la forte augmentation actuelle et future du trafic aérien, les questions relatives à la capacité, la sécurité et les effets environnementaux du transport aérien vont se poser de façon chaque fois plus critique. L'objectif général de cette thèse est de contribuer à l'amélioration de l'opération et de l'organisation du trafic aérien dans cette perspective de croissance. Le premier objectif spécifique de cette thèse est de faire la synthèse d'une loi de commande permettant aux avions de transport de suivre avec précision une trajectoire 3D+T. Le deuxième objectif spécifique de cette thèse est d'introduire une organisation particulière des corridors aériens, les airstreams, compatible avec la loi de guidage développée et permettant d'utiliser au mieux la capacité du corridor. Ainsi dans une première étape est introduite la dynamique de guidage des avions de transport, ainsi que les systèmes de guidage et de gestion du vol des avions modernes. Ensuite les principaux éléments de l'organisation de la gestion et du contrôle du trafic aérien sont introduits. La loi de guidage 3D+T est développée, simulée et ses performances sont analysées. L'étude d'une manœuvré de changement de voie dans un airstream est alors menée et mise en œuvre dans le cadre de la gestion du trafic à l'intérieur de celui-ci. Finalement les conclusions et perspectives de cette étude sont présentées / With the increase in air traffic, surely a question of flight efficiency (delays), environment impact and safety arise. This calls for improvements in accuracy of spatial and temporal trajectory tracking. The first main objective of this thesis is to contribute to the synthesis of a space-indexed nonlinear guidance control law for transportation aircraft presenting enhanced tracking performances and to explore the performances and feasibility of a flight guidance control law which is developed based on a space-indexed reference to track a 3D+T reference trajectory using nonlinear dynamic inversion control. The proposed guidance control law present reduced tracking errors and able to meet more easily overfly time constraints. Before presenting the main approaches for the design of the 3D+T guidance control laws; the modern flight guidance and flight dynamics of transportation aircraft, including explicitly wind components are first introduced. Then, a description of the current and modern air traffic organization including the organization of air traffic in high density flow will be shown and this will lead to a description of the Airstreams concept. This proposed concept is to organize main traffic flows in congested airspace along airstreams which are characterized by a three dimensional (3D) common reference track (ASRT). Finally, a scenario to perform basic maneuvers inside the airstream following a 3D+T trajectory using a common space-indexed will be developed and will be used to illustrate the traffic management along an airstream.

A well formed embouchure and a good tone quality are vital for any flutist. This study is a detailed guide that includes general information, influences and perspectives on/about embouchure and tone for the flutist. Information is provided on how to form a proper embouchure, the relation between embouchure and tone, the purpose of the embouchure and the role of different body parts in a) forming a proper embouchure and b) manipulating the embouchure whilst playing. The anatomy of the human body and its relation to embouchure and tone is discussed. Pictures of the different muscles involved in flute playing, muscles of expression and the anatomy of body parts that influence embouchure and tone, are presented. Flute teachers‟, performers‟ and students‟ perspectives on aspects relating to embouchure and tone, are provided. Diseases, medical conditions, medicine, physical attributes and infections that can influence embouchure and tone are investigated. A discussion of the influences that flute options have on embouchure and tone is included. These options include open- or closed-hole, B or C footjoint, materials, wall thickness, split E or E ring, open- or closed-G#, pads, headjoint design and flute scales. There is also a short discussion about embouchure on big flutes. AFRIKAANS : 'n Goed gevormde embouchure en „n goeie klankkwaliteit is van kardinale belang vir enige fluitspeler. Die studie is „n gedetaileerde gids, en bevat algemene inligting, invloede en perspektiewe op/oor embouchure en klank, vir die fluitspeler. Informasie oor hoe om 'n goeie embouchure te vorm, die verband tussen embouchure en klank, die doel van die embouchure sowel as die rol wat verskillende liggaamsdele speel in a) die vorming van die embouchure en b) die gebruik van die embouchure tydens spel, word voorsien. Die anatomie van die menslike liggaam wat verband hou met embouchure en klank, word bespreek. Prente van verskillende spiere betrokke tydens fluitspel, spiere van ekspressie en die anatomie van die liggaamsdele wat 'n invloed het op embouchure en klank, word voorgestel. Fluit onderwysers, voordraers en studente se perspektiewe rondom aspekte wat verband hou met embouchure en klank, word voorsien. Siektes, mediese toestande, medisyne, fisiese eienskappe en infeksies wat embouchure en klank kan beïnvloed, word ondersoek. 'n Bespreking van die invloede wat fluitopsies op embouchure en klank het, is ingesluit. Hierdie opsies sluit in oop- of geslote-opening, B of C voetstuk, materiale, buis dikte, gesplete E of E ring, oop- of geslote-G#, kussings, kopstuk ontwerp en fluittoonlere. 'n Kort bespreking in verband met embouchure op groot fluite word ook ingesluit. / Dissertation (MMus)--University of Pretoria, 2010. / Music / unrestricted

The thesis investigates methods of examining corneal biomechanics using non-contact tonometry and introduces novel techniques to investigate corneal material properties in vivo. A comprehensive systems analysis of the CorvisST (CST) and Ocular Response Analyser (ORA) was performed. Pressure sensors were used to characterisation the airflow produced by the CST and the ORA. Distinct differences were observed between the central airflow pressures between the two devices: the CST pressure was higher and of shorter duration. Scheimpflug high-speed imaging via the CST allowed components of the corneal deformation to be investigated and the development of a 3D deformation matrix (time, depth and spatial resolution) through tracing of the anterior and posterior corneal surface. Measures of whole eye movement (WEM) with CST were found to be robust. WEM demonstrated an asymmetric profile and a correction method was developed to address the corneal deformation matrix for this asymmetry. Novel methods for characterisation of intrinsic material characteristics of the cornea were developed using numerical and graphical analytical procedures. Application of these parameters was tested on enucleated porcine eyes across a wide range of manometry internal ocular pressure (MIOP). The dynamic E-Modulus was found to be most affected by MIOP change. To investigate the in vivo distribution and heterogeneity of the corneal biomechanics, a novel set-up allowed the mapping of corneal biomechanics across the cornea using the CST (central, paracentral, peripheral) and ORA (central, peripheral). Biometric and demographic grouping of subjects allowed detection of discriminating factors between individuals. The results suggest that the in vivo cornea of healthy human adults can be characterised as a viscoelastic, damped system for longitudinal strain and a highly oscillating system for lateral strain. The cornea is approximately homogenous for measures of rigidity and dynamic E-Modulus but other corneal material characteristics (longitudinal and lateral strain, hysteresis, damping and compressibility) demonstrated regional differences. The experimental design employed allowed for strict control of biometric and biomechanical intersubject variables, based on gold-standard techniques as well as newly-developed methods, thereby creating a normative database for future use.