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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 18 of 18 for “"property variation"”.
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Measuring clay property variation and effects on ceramic pot filter performance
Pure Home Water (PHW) is a non-profit organization in Ghana whose mission is to provide safe drinking water to Ghana's Northern Region - the poorest part of the country. Originally a distributor of ceramic pot filters (CPFs) manufactured in Accra, PHW began construction of a new factory outside of …
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A Calculation Model for Steam Property Variation Along Wellbore Trajectory in SAGD Process
… rate) were analysed in this thesis. These steam property profiles along wellbore trajectory actually build correlations between wellbore flow and oil production, and will improve the understanding in steam injection strategy adjustment as well as oil production dynamic monitoring
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Development of a Plasma Spray Process Monitoring System through Aeroacoustic Signal Analysis
… jet engine. In this application coating material property variation has a significant cost. In addition to the variation inherent in the process, some of the biggest contributors to coating property variation have been traced to spray gun nozzle wear and powder feed variation[3, 4]. Presented here …
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Effects of Fused Filament Fabrication Process Variables on Microstructural Alignment and Intra-layer Properties in PLLA
… FFF is currently incapable of achieving spatial property variation on this scale. The work in this thesis aimed to explore the formation of complex structures, utilising a conventional FFF 3D printer to manipulate polymer properties during printing. In conventional macroscopic prints, first layer …
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Investigation of Pulse Detonation Engine Flow Conditions for Turbomachinery Integration
… This model captures the sharp peaks in flow property variation without the need for expensive computational resources, outperforming other simplified approaches in the literature. With this simplified model, tools may be developed to carry out performance studies of new turbine concepts for …
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Production of Functionally Gradient Materials Using Model Thermosetting Systems Cured in a Thermal Gradient
… detailed understanding of the mechanism of property variation with cure temperature for this material. Subsequent characterization of gradient temperature cured samples has shown important variations, illustrating not only the importance of cure conditions, but the possibility of producing …
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Numerical study of mach number effects in compressible wall-bounded turbulence
… the compressibility effects caused by mean-property variation, isolating the intrinsic compressibility effects induced by fluctuations of the density and temperature (and pressure, dilatation, etc) fields. Centreline Mach numbers, Mcl, up to 6.2 have been considered, for which we find that …
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MEAN TURBULENCE STRUCTURE IN STRONGLY HEATED AIR FLOWS.
… heating rates caused slight, large and severe property variation of the air. The highest heating rate was found to cause significant buoyancy effects. The internal measurements were obtained using constant temperature hot-wire anemometry and resistance thermometry for velocity and temperature, …
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Simulated Response of Degrading Hysteretic Joints With Slack Behavior
… a stochastic routine accounts for material property variation; and a heuristic optimization routine estimates the parameters needed. The core model is a modified array of differential equations whose solution describes accurate hysteresis shapes for slack systems. Hysteresis parameter …
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Evaluation Of The Photo-induced Structural Mechanisms In Chalcogenide
… for a more thorough understanding of material property variation as a function of composition and in geometries representative of actual devices. This study evaluates compositional dependencies and photo-induced structural mechanisms in As-S-Se chalcogenide glasses. An effective fabrication …
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Seismic Data Conditioning and Inversion with Bayesian Methods and Dynamic Time-Warping
… regularizes the solution. Moreover, Amplitude variation with offset (AVO) processing workflows are carefully designed to preserve relative amplitude between offset gathers in preparation for reservoir characterization studies. But in the event where these traces are not aligned or production …
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Ultra-high pressure composite vessels with efficient stress distributions
… to elicit appropriate through-thickness material property variation rates to attain a more level stress distribution (or incipient failure throughout the wall) while restricting property changes to values attainable in commercially available composites. A computer code based on closed form …
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Material-based design computation
… with minimal resources through local material property variation, the research reviews, proposes and develops models and processes for a material-based approach in computationally enabled form-generation. Material-based Design Computation is developed and proposed as a set of computational …
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Effect of viscosity-compressibility product variation on the analysis of fractured well performances in tight unconventional reservoirs
… compressibility-viscosity product may exhibit variations 3 to 10 times greater than the initial values in the vicinity of the fracture and have a significant impact on the observed rate-time behavior. Consequently, solutions and procedures used in conventional gas-well performance evaluation, …
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Pedogenesis on the Sefton Coastal Dunes, NW England
… of baseline GIS maps, displaying spatial pedo-property variation across the dune landscape. Combined with vegetation data, topsoil analysis identifies 10 distinct pedo-environments. Physico-chemical characteristics of associated National Soil Resources Institute (NSRI) soil profile …
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Influence of Grain Size and Widmanstätten Colonies on Variability of Tensile Properties of Forged Ti-6Al-4V
<p>When testing forgings for specifications, it was found that some parts did not meet the requirements for mechanical properties. This triggered an investigation into two of the parts from the lot that did not meet specification. The ultimate reason for failure was due to lower than necessary …
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Tensile Properties of Loblolly Pine Strands Using Digital Image Correlation and Stochastic Finite Element Method
… of previous models did not account for the variation of mechanical properties present in wood materials. Little research has explored the uncertainties of mechanical properties in earlywood and latewood samples as well as wood strands. The goal of this study was to evaluate the effect of the …
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Magnetoelectric Composites for On-Chip Near-Resonance Applications
… of consecutive constituents. The interfacial property variation of these films was found to affect the coupling coefficient of corresponding ME nanocomposites. Subsequently, a novel complex three-dimensional ME composite with highly anisotropic structure was developed using a hybrid synthesis …