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 49 for “"Outgassing"”.
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Outgassing of chondritic planets
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1980.
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Effects of Atomic Oxygen on Outgassing of Silicone Materials
… that drive material selection are material outgassing and the presence of atomic oxygen in low Earth orbit (LEO). Materials that are considered for use in space are tested to be able to understand how they’ll outgas on orbit and how they’ll respond to interactions with atomic oxygen. …
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RECENT RIVERINE CARBON OF THE YELLOW RIVER: FLUXES, OUTGASSING AND BURIAL
Riverine carbon transport is an important component of global carbon cycle. Based on historical records and recent sampling during the period 2011-2012, the riverine carbon transport characteristics in the Yellow River were qualitatively and quantitatively investigated. Due to chemical weathering …
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Magma emplacement and deformation in rhyolitic dykes : insight into magmatic outgassing
… have been capable of facilitating persistent outgassing during dyke growth. It is further demonstrated that following initial dyke-opening, geochemically homogenous dykes grew via the incremental emplacement of magma, with fluctuations in the shallow-dyke permeability occurring via bubble …
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The Effects of Atomic Oxygen on the Outgassing Properties of Spacecraft Materials
… of space missions. Atomic oxygen (AO) and outgassing are among the chief concerns that spacecraft engineers must design for in order to ensure the safety of a spacecraft. AO is monatomic oxygen (O1) that is created when Ultraviolet (UV) radiation photochemically disassociates diatomic …
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Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
<p>Large igneous province (LIP) eruptions have been linked in some cases to major perturbations of Earth’s carbon cycle. However, few observations directly constrain the isotopic composition of carbon released by LIP magmas because carbon isotopes fractionate during degassing, which hampers …
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The Atmospheric Fingerprints of Volcanism: Simulating Volcanic Outgassing and Secondary Atmospheres on Rocky Planets
The study of the atmospheric composition and evolution of rocky planet atmospheres is key to understanding both the conditions required to develop a habitable planet, and to analyse the link between the deep interior and atmosphere of rocky bodies. This thesis uses volcanism as a chemical link …
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Modeling multicomponent vacuum flow, transport, and outgassing in a membrane-inlet vapor sampling probe
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Experimental Evaluation of the Rate of Rise Technique for Measuring Outgassing Rates in a Vacuum
… corresponding increase in the need for values of outgassing rates of many materials. In space flight the knowledge of the outgassing rates of components and materials used in construction of space vehicles allow the determination of pressures within sections of the vehicle, the contamination level …
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Effects of Atomic Oxygen on the Vacuum-Induced Mass Loss Properties of a Variety of Spacecraft Materials
… oxygen (AO) environments. This project used the outgassing testing chamber and the AO chamber in the Cal Poly Space Environments lab to test multiple common spacecraft materials and determine whether AO affects the outgassing properties of those materials. This research has relevant applications …
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Anode Materials for High Power Microwave Devices
… devices by developing novel anodes with minimal outgassing and secondary electron emission properties, anodes which do not erode during usage nor limit the lowest achievable pressure in an HPM device. To accomplish this, two methods have been identified: laser surface melting for outgassing …
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Air-sea CO2 cycling in the southeastern Beaufort Sea
… although we also measured one instance of outgassing. Sea surface dissolved CO2 measurements (pCO2sw) in Amundsen Gulf showed significant undersaturation with respect to the atmosphere at freeze–up, followed by a slow increase over the winter until spring phytoplankton blooms caused strong …
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Formation, structure and habitability of super-Earth and sub-Neptune exoplanets
… protoplanetary nebula, sublimation of ices, and outgassing of volatiles from a rocky interior. We next explore the low-density extreme of the mass-radius relations for volatilerich super-Earth exoplanets. Using models of planet formation, structure, and survival, we constrain the minimum …
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Near-IR Spectroscopic Analysis of the Primary Volatile Composition of Long and Short-Period Comets
… volatiles were obtained to understand their outgassing sources, and the results are discussed in detail in this work. In particular, H<sub>2</sub>O exhibited spatial profiles that are indicative of the presence of extended outgassing sources in the coma, similar to the EPOXI mission target …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
… (arcs, ocean islands, and continental rifts) and outgassing environments (magmatic vents and lava-seawater interactions), and extends to the compositional evolution of volcanic plumes in the atmosphere. Starting within the magmatic system, in Chapter 3 I use gas and melt compositions, equilibrium …
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The effect of bombardment of small bodies on the evolution of atmospheres of terrestrial bodies
… erosion, volatile delivery and impact-triggered outgassing from the target body surface. In this thesis I investigate the effect of bombardment by these small bodies on the evolution of atmospheres on planets and moons. I first provide an introduction to the processes relevant to the formation …
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Computational design of interfaces : mitigating He damage in nuclear fusion applications
… surfaces may enable controlled He removal via outgassing, thereby averting He-induced damage. In this thesis, computational methods are developed for identifying promising interfaces that give rise to He channels and for modeling He network behaviors at these interfaces. These models are then …
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Inside-out diversity of rocky planets
… and melting model to estimate rates of volcanic outgassing on the early Earth, before modern plate tectonics—early Earth provides an elucidative case study to ground our understanding of planet diversity. These estimates focus on the possible range of mantle oxygen fugacities, a measure of how …
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Effect of rigid crystals on the experimental sintering of rhyolitic ash under shallow conduit conditions
… particles may have important consequences for outgassing in the shallow conduit if the material is sintered together.
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