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 260 for “"Surface layer"”.
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Surface layer formation on Pb/Sn alloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Controlled Surface Layer Deposition for Steel Surface Hardening
… and 5% H2-N2 (nitridation), were used for surface hardening. The coarse Ti particles (≤50 μm) were suspended in ethanol using the charging agent poly(diallyldimethylammonium chloride) (PDADMAC). EPD: The present work demonstrated the importance of assessing the electrophoretic mobilities of …
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Structure of atmospheric turbulence in the surface layer
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1964.
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Spectral modeling of an idealized atmospheric surface layer
Almost all of humanity resides in the atmospheric surface layer (ASL), so its state (e.g., temperature, humidity, wind velocity) is relevant to a range of applications in human health, agriculture, and ecosystem health. However, the ASL is turbulent, and therefore characterized by complex dynamics …
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A continuum surface layer effect in polycrystalline aggregates
… measurements provided average stress values in a surface layer of only a few grain diameters, these results suggest that the surface layer of the metal is yielding at a lower stress than the bulk. This anomalous behavior is duplicated qualitatively with a continuum model of an aggregate of soft …
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Surface layer evolution in glow discharge optical emission spectroscopy.
… bulk materials and the depth profiling of multi-layer structures. Most research in the use of GDOES has concentrated on developing accurate methodologies for quantitative analysis and depth profiling. However, this thesis presents a study on various aspects of surface layer evolution under argon …
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Large eddy simulation of the upper atmospheric surface layer
… in the theoretical framework of the atmospheric surface layer (ASL). Measurements, however, provide a great scatter in their estimates mainly because the requirements of neutrality (only for estimate of tc), stationarity and horizontal homogeneity in the real atmospheric boundary layer (ABL) are …
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Laser Melting and Subsequent Solidification of a Surface Layer
Made available in DSpace on 2014-12-13T19:55:31Z (GMT). No. of bitstreams: 1 8004193.pdf: 5313164 bytes, checksum: 77a9d10c82875b45ac575b532a99b80d (MD5) Previous issue date: 1979
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Structure of turbulence in the marine atmospheric surface layer
… amidst the chaos of a turbulent boundary layer. It has been observed that a quasi-periodic phenomena called “bursting” accounts for a major contribution to the turbulent Reynolds stress and the production of turbulent kinetic energy. Bursting is the term used for a sequence of events, …
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Characteristics of Coherent Structures in Marine Atmospheric Surface Layer
… in the near neutral marine atmospheric surface layer. With Taylor's hypothesis, the temporal velocity signals have been transformed to spatial fluctuations and then visualize these spatial velocity fluctuations to identify the coherent structures. It has been confirmed that there exist …
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Surface-Layer Semivolatiles Impact on Hydrochar Application For Fuel and Environment
… semi-volatile organic compounds from the surface of hydrochar known as secondary char (SC). Over the past decade, studies have shown SC to be a hinderance in HC application for fuels and the environment, due to early burn-out time and phytotoxicity to plants. A major goal of this …
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Surface layer processes and nocturnal low-level jet development--an observational study during PECAN
… and collected high-resolution stable boundary layer data as it evolved through the night. The objective of this study was to use this dataset to identify the impact of LLJ presence on surface layer properties, such as thermal stability, dynamic stability, surface fluxes, and turbulence. …
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Biogeochemical controls on ammonium accumulation in the surface layer of the TD: Southern Ocean
… cycling of NH₄⁺ in the seasonally-varying mixed layer remains poorly understood. On a cruise from Cape Town (33.9°S) to the Marginal Ice Zone (MIZ; 61.4°S) in winter 2017, surface samples were collected and analysed for nutrient concentrations, planktonic community composition, size-fractionated …
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The stratification maxima of the seasonally varying Surface layer in the Arctic Ocean’s Beaufort Gyre
… stratified at the base of the wintertime mixed layer, which impedes the vertical transport of heat, energy, and other tracers. Ice-Tethered Profiler observations during 2004-2018 were used to characterize and investigate the seasonal and interannual variability of the strength, depth, density, …
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The Stratification Maxima of the Seasonally Varying Surface Layer in the Arctic Ocean’s Beaufort Gyre
… stratified at the base of the wintertime mixed layer, which impedes the vertical transport of heat, energy, and other tracers. Ice-Tethered Profiler observations during 2004-2018 were used to characterize and investigate the seasonal and interannual variability of the strength, depth, density, …
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Mechanical properties of degraded PMR-15 resin
… non-uniform degradation state in PMR-15 resin. A surface layer, usually attributed to oxidative degradation, forms. This surface layer has different properties from the inner material. A set of material tests was designed to separate the properties of the oxidized surface layer from the properties …
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Bedload transport: the effects of particle shape and an investigation of a wide range of transport rates
… of bedload transport rates using both bed subsurface and surface layer based approaches are investigated using fractional transport analysis with a similarity approach. Bedload transport data from a stream containing flat, low density shale particles indicates that the reference transport …
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Ability of Caries Detection Methods to Determine Caries Lesion Activity
… acid diffusion and demineralization of enamel subsurface with an intact surface layer (SL). Caries lesions progress when the outcome of demineralization and remineralization processes over time is net mineral loss. Lesions that continue to demineralize are called active, while those that display …
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Cottonwood Establishment in a Gravel-Bed River
… propagation, controlling for elevation and surface texture. I examined seedling response to soil texture in the root zone, thickness of the coarse surface layer of clean gravel, and depth to water. I found no effects of the vertical distance to water. On the other hand, the proportion of …
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