Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 240 for “"High altitude"”.
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High Altitude Fish
<p>This manuscript addresses the process and product of this author’s creative writing, and the literary traditions from which it has grown. The chapters of the critical introduction are a discussion of the craft techniques of Mark Doty, Ted Kooser, Richard Hugo, Mary Oliver and Molly Peacock. …
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Human health impacts of high altitude emissions
… on surface emissions, and the contribution of high altitude emissions to these issues is rarely examined. In this thesis, potential links are investigated between high altitude emissions and damages or benefits to human health via photochemical effects. Changes in population exposure to fine …
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Long term prediction of high altitude orbits
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1981.
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Limb scatter measurements of high altitude cloud distributions
… and lower stratosphere. Cirrus clouds occur at high altitude around the tropopause level and, despite their thin appearance and low optical thickness, they contribute to the radiative balance of the atmosphere. The processes in this region of the atmosphere have become increasingly important for …
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Enhancing Thermal Efficiency Assessment in High-Altitude Footwear
L'abstract è presente nell'allegato / the abstract is in the attachment
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Landscape genomics of tropical high altitude plant species
Changes to species distributions involve demographic processes that occur over generations and affect allele frequencies within populations, leading to patterns of genetic restructuring. The specific genetic structuring patterns that will be observed as a consequence depend on explicit geographical …
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Adaptive lung growth following exposure to simulated high altitude
Altered oxygen balance in the body at high altitude and in some physiological and pathological conditions may induce adaptive changes in the body which may be organ specific. Because gas exchange is the primary function of the lungs, they may undergo structural changes to adapt to the imbalance of …
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Dynamics and Control of Very High Altitude Tethered Balloons
… a preliminary feasibility assessment of Very High Altitude Tethered Balloons (VHATBs) under both steady-state and extreme operational conditions. A discretized lumped-parameter model is used to represent the tether. HATBs have a variety of potential applications ranging from telecommunications …
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Sensitivities of Atmospheric Composition to High-Altitude Vehicles Emissions
… explored the environmental implications of high-altitude transportation, with a focus on civil supersonic transport (SST) emissions. The potential atmospheric impacts of these emissions, including changes in atmospheric composition and air quality, are examined in detail. Previous studies …
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Model-agnostic Methodology for High-Altitude Balloon Mission Planning
High-altitude balloons (HABs) are increasingly used for atmospheric science, technology validation, Earth observation, and resilient communications. There is a need for modeling HABs in multi-domain missions, and a key challenge for incorporating them is their flight trajectory dependence on …
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Experimental investigations into high-altitude relight of a gas turbine
This thesis describes experiments to investigate high-altitude relight of a lean direct injection (LDI) combustor. The features that make LDI technology less polluting in terms of NOx compared to conventional combustors are expected to impede relight performance. Therefore an improved understanding …
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Auroral Ion Upflows: Sources, High Altitude Dynamics, and Neutral Wind Effects
… of thermal plasma are commonly observed in the high-latitude, topside ionosphere. These auroral ion upflows have a range of potential sources including frictional heating, electron precipitation, neutral winds, and higher-altitude density cavities. The unique signatures and detailed evolution of …
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Radiosonde High Altitude Measurements of Radiation Levels and Cosmic Ray Events
… crew and passengers working in potentially higher radiation environments. On March 11, 2021 the balloon’s volume was gradually enlarged, and was released at 11:52:13 AM and the balloon travelled a total range of 285 km which is the longest range travelled by any balloon launched at SFA. It …
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Does acute hypoxia and high altitude exposure adversely affect cardiovascular performance?
Introduction: The cardiovascular adaptations to high altitude (HA) exposure and its relationship to acute mountain sickness (AMS) are incompletely understood. Aims: This thesis addresses four main hypotheses 1. HA adversely affects biventricular cardiac function leading to an increase in estimated …
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Modelling, simulation and performance evaluation: PEM fuel cells for high altitude UAS
… is considered as a potential power source for high altitude UAS (unmanned aircraft systems) operations. At altitudes in excess of 10 km, very low atmospheric temperatures and pressures, and unexpected variations in the load demand put severe stresses on the operation and performance of PEM fuel …
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Array Signal Processing for Communications from High Altitude Platforms and Other Applications
… digital beamforming in the communications from high altitude platforms (HAPs) and the high data rate OFDM signal transmission in underwater acoustic channel are respectively investigated. Both conventional and adaptive beamforming methods are investigated in the application to HAP …
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Effects of Long-Term, High-Altitude Hypoxemia on Fetal Ovine Coronary Arteries
… studies to investigate the effects of long-term, high-altitude hypoxemia on the contractility of fetal coronary vessels, namely the left circumflex, left anterior descending, and right coronary arteries. We have found that in response to chronic hypoxia, isolated fetal ovine coronary arteries …
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