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 138 for “"sublimation"”.
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Sublimation at low pressures
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1960
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Condensation and sublimation of carbon dioxide and water molecules at cryogenic temperatures
… density population is presented. The rate of sublimation of these two gases was measured directly. The results are reported in terms of vapor pressure in the range 10⁻⁹ to 10⁻⁴ Torr. The spatial distribution of reflected and sublimated CO₂ and H₂O molecules is found to follow the diffuse …
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Measurements of soot sublimation and oxidation at high temperatures in a shock tube
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Study of Skin Friction and Surface Regression Interaction via the Naphthalene Sublimation Technique
… study explores the potential of the naphthalene sublimation technique to be used to analyze the manner in which surfaces regress, specifically focusing on the effect that skin friction has on regression and vice versa. For this experimentation, a flat steel plate installed with three skin …
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Coupled fluid-thermal analysis of low-pressure sublimation and condensation with application to freeze-drying
… bio-pharmaceuticals for removal of solvents by sublimation. The goal of the process is to provide a stable dosage form by removing the solvent in such a way that the sensitive molecular structure of the active substance is least disturbed. The vacuum environment presents unique challenges for …
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Effect of deep levels on the performance of CdTe/CdS solar cells deposited by electrodeposition and close spaced sublimation, The
Includes bibliographical references (pages 52-53).
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The cultural niche of sublimated creativity
The dearth of empirical research on sublimation may be demonstrating the inherent difficulty scholars in the past have experienced in capturing the process of sublimation in the lab (Baumeister, Dale, & Sommer, 1998). Given the suspected difficulty of empirically capturing the process of …
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ON THE INTERACTION OF SUBLIMATING GAS WITH COMETARY BODIES
Sublimation of volatiles is a defining process of comet nuclei, and profoundly affects their dynamics, structure, and appearance. Central to understanding the processes by which comets formed and subsequently evolved is a careful computation of this sublimation pressure as a function of …
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Investigations of the Martian Mid-Latitudes: Implications for Ground Ice
… of geomorphology and modeling. I first examine sublimation of ice from new small mid-latitude craters with freshly exposed ice imaged by the High Resolution Imaging Science Experiment (HiRISE) camera. I discuss the theory of sublimation by free convection and describe a model that improves on …
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Observed microphysical characteristics and inferred thermodynamic processes contributing to the structure, evolution, and maintenance of nocturnal elevated mesoscale convective systems
… with the rear inflow notch, cooling by sublimation of particles combined with enhanced descent within the rear inflow jet (RIJ) allowed ice particles to survive to temperatures as warm as +6.8°C. In addition, mesoscale descent associated with the RIJ allowed for subsaturated air to …
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La pedofilia en el inconsciente del varón hispanoamericano a través de algunos autores
… such practices in the literary world through sublimation. Sublimation is characterized by the elevation of artistic material to a religious level. It is through sublimation that pedophilia rises and these practices are romanticized in novels, however, when Freudian theory is applied to the …
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Chemical vapor deposition of polymeric films
… the influence of deposition parameters, such as sublimation temperature, substrate (pyrolysis) temperature, pressure, plasma condition on the structure of deposition product was systematically studied. It's found that the following deposition parameters are required for carbon films containing …
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Timescales of processes controlling water vapour entry to the stratosphere
… Results find the phase change of ice to vapour (sublimation) is a substantial component of the water vapour budget above the tropical tropopause, and convective injection of ice occurs above the vertical minimum in saturation mixing ratio. Results also show that the extent to which …
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Landscape evolution and preservation of ice over one million years old quantified with cosmogenic nuclides 26Al, 10Be, and 21Ne, Ong Valley, Antarctica
… shows that these deposits originate from sublimation of debris-laden glacier ice. Buried glacier ice is still present beneath the youngest two drifts, one of which is older than one million years. The tills above the ice record the repeated advances and stagnations of the Argosy Glacier. …
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Novel Low Dielectric Constant Thin Film Materials by Chemical Vapor Deposition
… the effect of the substrate temperature, the sublimation temperature, and the pyrolysis temperature on the deposition rates of PPXC. It was determined that the substrate temperature has the greatest effect, with about 50% contribution, and deposition rates increased with decreasing substrate …
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Investigation of Small Scale (<50m) Surface Features on Mars' North Polar Cap Using Data from HiRISE
… Whether these features can be formed by sublimation processes is also tested. Of the 499 HiRISE images extracted, roughly 69% of features are found whose morphology suggest that they are aeolian in origin. Some ripples found align themselves with the local katabatic winds and their …
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Microphysical Influences on cold pools
… type (e.g. melting of graupel or hail, sublimation of graupel or hail, or evaporation of rain) to the total latent cooling occurring in the downdraft prior to the initiation of a -2K cold pool. The melting and sublimation of graupel in the downdraft dominates the integrated latent …
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Estimation of evaporation of previously condensed hydrocarbons in a tunnel burn experiment
… thesis is to estimate the amount of evaporation/sublimation possible for different types of organic materials during burns in a tunnel. This was carried out theoretically and compared to measurements. For the estimations, predictions of the wall and ambient temperatures were made. The …
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Processing of CdS/CdTe solar cell and the growth model of CdTe thin film
… coated with TCO layers by the close-spaced sublimation (CSS) or sputter techniques in industrial because of in-line production integration. It is seldom reported that CdS is deposited by the chemical bath deposition (CBD) batch process. The bottleneck of CBD for commercial application is its …
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