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<p> Measurements were taken on 1511 flutes from various localities in Eastern North America. Over 85% of the flutes recorded are from the Cloridorme Formation (Ordovician) of North-Eastern Quebec. Flutes occur in a variety of shapes, on A, B and C beds of the Bouma sequence, but no one shape is confined to any one bed type. However, A beds do tend to have a larger proportion of wide flutes on their soles than B or C beds. Whilst flutes on B and C beds are often found associated with brushes, grooves and signs of organic activity, those on A beds are rarely found associated with any other sole marks. </p> <p> Several parameters of width, length and depth have been measured, but the maximum length of the flute was shown to be an inconsistently measurable parameter. by means of an operator error experiment. The maximum -depth of the flute is found to be independent both of the bed type on which it occurs and also the maximum grain size of that bed. No relationship is found between the total bed thickness and the maximum grain size of the bed. </p> <p> As flutes become broader, the point of maximum depth is found to migrate downstream so that wider flutes have their point of maximum depth quite far back from the nose. </p> <p> Factor analysis shows that two factors control the overall morphology of the flutes: firstly the shape of the nose portion, in planview termed the 'nose angle': and secondly, the ratio of the maximum depth and the distance of this point from the nose. </p> <p> Calculations based on previous experimental work, but using field measurements, suggest that velocities in the order of 7 metres/sec and 4 metres/sec are required for the continuance of flutes on B and C beds respectively. </p> / Thesis / Master of Science (MSc)

Given the mission of community colleges, their leaders are often responsible for developing resources to support student success and improve relationships with surrounding communities. To accomplish these goals, community college leaders sometimes participate in cross-sector partnerships (CSPs) since CSPs can strengthen relationships and develop resources across sectors. However, little is known about campus and community leaders' perceptions of forming CSPs and the value they generate. This study examined campus and community leaders' perceptions of CSP participation, specifically the formation process and the value created. Guided by the Collaborative Value Framework (Austin and Seitanidi, 2012a), I conducted a multi-site case study of four community colleges in western rural North Carolina, with each college participating in a CSP designed to support adult students through a workforce development program. Findings revealed intricacies of the CSP formation process and the rich array of value created from CSP participation. Further, each case held a distinct personality, represented by a metaphor to highlight its unique findings: The Phoenix, The Beehive, The Compass, and The Treasure. Finally, leaders perceived CSP participation to be so enriching that each organization planned to continue, expand, or create new CSPs to meet additional shared needs. Leaders revealed a learning process connected to CSP participation that resulted in continual refinement and enhanced plans for future CSPs, illustrating the benefits of CSPs for addressing shared campus and community goals. Findings offer several implications for campus and community leaders, as well as future research and policymaking related to campus and community CSP participation. / Doctor of Philosophy / Given the mission of community colleges, their leaders are often responsible for developing resources to support student success and improve relationships with surrounding communities. To accomplish these goals, community college leaders sometimes participate in cross-sector partnerships (CSPs) between organizations. However, little is known about campus and community leaders' perceptions of forming CSPs and the value they generate. This study examined campus and community leaders' perceptions of CSP participation, specifically the formation process and the value created. I conducted a multi-site case study of four community colleges in western rural North Carolina, with each college participating in a CSP designed to support adult students through a workforce development program. Findings revealed the importance of establishing solid practices when initially forming a CSP to strengthen the collaboration. A wide variety of rich types of value creation was developed over the course of these CSPs, going well beyond the traditional expectations of simply sharing basic resources between organizations. Further, each case held a distinct and insightful personality, represented by a metaphor to highlight its uniqueness: The Phoenix, The Beehive, The Compass, and The Treasure. Finally, leaders perceived CSP participation to be so enriching that each organization planned to continue, expand, or create new CSPs to meet additional shared needs. Leaders learned new ways to improve current and future CSPs. This study can help campus and community leaders make decisions about the feasibility of participating in a CSP to address a shared goal more effectively rather than tackling a more complex problem single handedly.

For close proximity flying on the order of 10-100 meters, Coulomb thrusting presents a promising alternative to other methods of propulsion. This clean and fuel-efficient propulsion method is being investigated for use in formation flying and virtual structures. In the latter application, the individual spacecraft assume fixed positions relative to each other through the use of Coulomb forces. In the work presented here, an analytical and numerical analysis is performed on such virtual structures. In the analytical portion, the constant, open-loop charges necessary to maintain a Hill-frame-static formation are determined for the cases of linear two- and three-spacecraft formations and for the case of equilateral triangular formations with spacecraft of equal mass. In addition, analysis is provided for the N-craft case so that the inter-craft charge products can be determined for any static formation. In the numerical portion, a genetic algorithm is employed to support the analytical results by determining formation geometries and charging schemes such that the formation craft remain static in the Hill frame in the absence of perturbation. The results of the numerical analysis include examples of static two-craft through nine-craft formations, including several formations that display a broader range of configurations than considered in previous works. Issues encountered during the numerical analysis are discussed, as well as the course of action taken to overcome these issues. Finally, a method is presented by which the genetic algorithm could be extended to take advantage of cluster computing. / Master of Science

The ring opened in the formation of α-cyanobromolycopodine has been found to be six-membered or larger. The product of hydrogenation of β-cyanobromolycopodine in alkaline medium has been shown to be the cyclized compound, C17H24ON2, not β-cyanolycopodine, C17H26ON2, as thought previously. A study was made of the β-cyclized compound but it could not be ascertained whether it has a ketone or an enol-ether structure. The possibility of a β-piperidone structure for lycopodine is discussed / Thesis / Master of Science (MS)

Les galaxies irrégulières naines renferment de multiples mystères quant à leur fonctionnement et à leur évolution. Malgré ces énigmes, elles sont très importantes pour comprendre l'évolution de l'Univers, puisque certains scénarios cosmologiques suggèrent qu'elles constitueraient les bases fondamentales de la fusion hiérarchique des galaxies. La galaxie irrégulière naine NGC 4449 est la candidate parfaite pour étudier avec une haute résolution les comportements des galaxies du début de l'Univers, à cause de sa forte ressemblance avec celles-ci. Des données prises avec une haute résolution spatiale et spectrale sont utilisées pour obtenir de l'information à l'échelle des amas stellaires individuels, tout comme à l'échelle de la galaxie entière. Il est donc possible de relier les mécanismes de formation stellaire globaux de la galaxie aux propriétés morphologiques, chimiques, et cinématiques des régions de formation stellaire récente. Dans ce mémoire, la théorie des galaxies naines et irrégulières est explorée, en se concentrant particulièrement sur les propriétés reliées à la formation stellaire. Les caractéristiques de la galaxie irrégulière naine NGC 4449, qui constitue le sujet de cette étude, sont ensuite détaillées. Ses régions H ii, régions de gaz ionisé associées aux amas stellaires jeunes, sont subséquemment détectées et étudiées de manière statistique, pour en apprendre plus sur l'activité de formation stellaire et l'histoire évolutive de NGC 4449. Cette étude fait partie du grand programme SIGNALS, visant l'étude de l'évolution des galaxies qui utilise les données acquises à l'aide de l'instrument SITELLE au CFHT. / Dwarf irregular galaxies still hold multiple mysteries regarding their behaviours and evolution. However, they are crucial systems to understand the evolution of the Universe, as they represent the fundamental building blocks of hierarchical galaxy fusion in certain cosmological scenarios. The dwarf irregular galaxy NGC 4449 is the perfect candidate to study, with a high resolution, the behaviours of the galaxies at the beginning of the Universe, due to its strong resemblance with them. High spatial and spectral resolution data is used to obtain information on the stellar cluster scale, as well as on the scale of the entire galaxy. It is thus possible to link the global star formation mechanisms of the galaxy to the morphological, chemical, and kinematical properties of the recent star formation regions. In this work, the theory of the dwarf and irregular galaxies, especially regarding their properties related to the stellar formation, is explored. The characteristics of the dwarf irregular galaxy NGC 4449, the subject of this study, are detailed thereafter. Its H ii regions, regions of ionised gas associated to young stellar clusters, are then detected and statistically studied to gain more insight on the star-forming activities and the evolution of NGC 4449. This study is part of the SIGNALS large program, which aims to study the evolution of galaxies in the nearby Universe, by using data from the SITELLE instrument at the CFHT.