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.
Results
Showing 1 to 20 of 66 for “"Surface Geometry"”.
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Local illumination models from surface geometry microform
… we propose a model to simulate the small-scale geometry of cloth and develop a method to derive the BRDF (Bidirectional Reflectance-Distribution Function) of this model from the underlying surface geometry, taking into account the blocking and shadowing phenomena at the small scale. Sample …
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Interactive Fabrication & Design of Bioinspired Surface Geometry
… and fabricating a morphologically complex surface geometry developed with bio-inspired design strategies. The thesis describes the method and process of designing such bio-inspired surface geometry and the means of materializing such geometry by proposing an interactive fabrication-informed …
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The relationship between surface geometry and transonic intake performance during off-design climb
… access has inhibited observations of how intake surface geometry influences the SBLI. This thesis investigates the relationships between intake surface geometry, the impact of the transonic SBLI, and intake performance during off-design climb with a quasi-two-dimensional (Q2D) experiment that …
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Effects of micro- and nano-scale surface geometry on behaviors of live cells and liquid droplets
As the scale of the surface texture responsible for superhydrophobicity becomes similar to the size of a droplet, simple models based on homogeneity assumptions begin to break down. In order to better understand these discrete phenomena, we first create a unique model with the finite element …
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Atmospheric Water Harvesting: An Experimental Study of Viability and the Influence of Surface Geometry, Orientation, and Drainage
… addition of a Teflon coating to the collection surface, 15% by clearing the collection surface, and 89% by tilting certain collection surfaces by 60-75°. In combination, these parameters could push active atmospheric water harvesting into economic viability where significant infrastructure …
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Fluid Dynamics and Surface Pressure Fluctuations of Turbulent Boundary Layers Over Sparse Roughness
Turbulent boundary layers over rough surfaces are a common, yet often overlooked, problem of practical engineering importance. Development of correlations between boundary layer parameters that can be used in turbulence models and the surface geometry is the only practical option for solving these …
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The surface morphology of a small drainage basin in the North Dakota Badlands
<p> To describe the surface morphology of a fourth order drainage basin located in the North Dakota Badland,, the writer made quanti tative application• of known descriptive techniques and morphological laws. </p><p> The surface configuration is a function of the study area's linear, areal, and …
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Simplified Combustion Modeling of Composite Propellants
… composite propellant combustion: (1) a free surface boundary, (2) gas- and condensed-phase heat release distributions based on simplified chemical kinetics, and (3) an implicit surface regression rate (unique burning rate) determined by coupled gas-solid energy/species transport analysis. …
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Energy, power, and office buildings : design and analysis of an off-peak cooling system using structural mass storage
… spacing, internal loads, water temperatures, and surface geometry is assessed. The analytical results suggest the potential for application, however, additional research must be undertaken to investigate the economic implications of fabrication and to more adequately determine the effects of …
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Local Adaptive Slicing for Layered Manufacturing
… compromise between rapid production with large surface inaccuracies, and slow production with high precision, by choosing between thick and thin build layers, respectively. Adaptive layered manufacturing methods alleviate this decision by automatically adjusting the build layer thickness to …
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Turbulent Boundary Layer Flow Over a Bump
… complex three-dimensional (3D) effects due to surface curvature and pressure gradients. These conditions introduce flow skewing, anisotropy, and deviations from classical equilibrium behavior, making them difficult to model and predict accurately. This thesis examines the behavior of 3D …
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Mass Properties Calculation and Fuel Analysis in the Conceptual Design of Uninhabited Air Vehicles
… of homogenous solids represented by polyhedral surface geometry. A newly developed method for calculating the mass properties of thin shell objects, given the same type of geometric representation, is derived and explained. A methodology for characterizing the mass properties of fuel in tanks …
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Online microwave measurement of complex dielectric constant
… to be best suited to applications with constant geometry feed presentation ( ie. a continuous, homogeneous product stream with little variation in surface geometry).
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Investigating the influence of film formation on the machining performance in an atomization-based cutting fluid spray system
… droplets of the cutting fluid on the tool surface results in the formation of a thin liquid film that penetrates the narrow tool-chip contact region and improves tool life. The characteristics of the thin film such as the film thickness and velocity influence the performance of the ACF …
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A Computational Fluid Dynamics (CFD) Analysis of the Aerodynamic Effects of the Seams on a Two-Dimensional Representation of a Soccer Ball
… or projectile with specific shape, size, and surface geometry, except for soccer. Over the history of the sport, the surface geometry and design stayed relatively unchanged, sewn together using 32 pentagonal and hexagonal panels. However, recent innovations in panel designs differ …
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Experimental Study of Tire Inner Liner
… thickness variations, defects (like voids), surface geometry and anisotropy may be exaggerating the effects of applied loads.</p>
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Tactile sensing using elastomeric sensors
… sensor to get the 3D information of contacting surfaces. Using GelSight, some tactile properties, such as softness and roughness, could be gained through image processing techniques. In this thesis, I implemented GelSight principle to reconstruct surface geometry of tested surfaces, based on …
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Load transfer mechanism of fully grouted cable bolts.
… of different parameters including the cable surface geometry, borehole size and confining medium strength was evaluated. The results show that bond failure of Superstrand cable bolting systems always occurred at the cable/grout interface. However, for the MW9 cable installed in a standard …
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Numerical and Experimental Study of Rock Fracture Creep Under Dry Conditions
… and modeling. To study the effect of surface geometry on fracture dry creep, initial steps considering viscoelasticity have been taken. A numerical model was developed to investigate the effect of surface geometry on rock fracture visco-elastic deformation. First, synthetic fracture …
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Exploration of a geometric approach for estimating snow surface roughness
The roughness of a surface that influences atmospheric turbulence is estimated as the aerodynamic roughness length (Z0), and is used to understand the flow of air, temperature, and moisture over a surface. Z0 is a critical variable for estimating latent and sensible fluxes at the surface, but most …
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