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 52 for “"Surface curvature"”.
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Contact Surface Curvature Length Specifies Graspability
… in a 1:1 fashion. We recomputed the ratio using surface curvature length of the object instead of the diameter as the relevant object property. The thinking was that the hand forms an arc when making contact with the surface of the object, thus, the size of the area over which the hand makes …
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Depth sensor based object detection using surface curvature
… we propose a feature, Histogram of Oriented Curvature (HOC), designed specifically to capture local surface shape for object detection with depth sensor. We form the HOC feature as a concatenation of the local histograms of Gaussian curvature and mean curvature. The linear Support Vector …
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Surface Curvature and Roughness Effects on Görtler Vortex Development in Hypersonic Flow
… computational and experimental investigation of surface roughness and concave curvature as control parameters on the development of Görtler vortices in hypersonic flow. Three-dimensional large eddy simulation (LES) was performed for two curvature cases using US3D, an unstructured-grid finite …
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Pct1 regulates phosphatidylcholine synthesis in response to changes in surface curvature elastic stress sensed on the inner nuclear membrane
… demonstrated to correlate with membrane stored curvature elastic stress estimates. Furthermore, this process occurs inside the nucleus, although nuclear localization signal mutants can compensate for the loss of endogenous Pct1. These data suggest an ancient mechanism by which CCTα senses lipid …
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A Mesoscale Dynamics study of the phases in surfactant-water ternary systems
… require ordered and stable phases with high surface curvature. The phases present in such systems were successfully modelled, the results of which compare well with experiment. Additives which decreased the surface curvature of the interfacial region included oils and long-chained alcohols. …
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Compression mold filling simulation for thick, nonplanar parts
… mold filling over three-dimensional curved surfaces. The effects of charge thickness and surface curvature on the pressure and velocity distributions are examined.
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Autonomous tactile object exploration and estimation using simple sensors
… are presented. In addition to shape estimates, surface curvature measurements were also obtained. The unique end-effector that provided compliance for the force controller was also able to measure the arc length traversed on the object's surface. Arc length combined with surface orientation …
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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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Generation and relaxation of nanometer-scale roughness on the germanium(001) surface
The surface morphology of Ge(001) during etching by low energy ions is characterized using scanning tunneling microscopy. The surfaces are bombarded by 240 eV xenon ions at various temperatures and exposure times. A well defined in-plane length scale is observed on the crystalline surfaces etched …
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An investigation of highly underexpanded exhaust jets impinging normal to a curved surface
… jets impinging in a direction normal to a curved surface was conducted in the NASA-Langley Research Center 55-foot vacuum cylinder. The investigation included measurements of impingement pressures and measurements of various normal shock characteristics. Variables of the investigation were the …
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Crack Patterns in Thin Films and X-ray Optics Thermal Deformations
… consequently in distortions of the reflective surface. In addition, the excessive heating may activate interdiffusion in the multilayers coatings and result in degradation of their reflective performance and even film cracking. Therefore, analysis of the thermally-induced deformations and …
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A numerical study of laminar to turbulent evolution and free-surface interaction of a vortex ring
… ring evolution and interaction with a free surface. An investigation of a single unbounded vortex ring at various Reynolds numbers and core thicknesses showed qualitative differences between the evolution of thin- and thick-core rings, leading to a correction factor to the classical equation …
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Contact and coalescence of viscous drops
When two fluid drops come into contact, surface tension quickly pulls the drops together into a single larger drop. This coalescence process is an example of a singular flow resulting from a topological transition, in this case between the disjoint and connected drops. In this thesis, we consider …
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Interaction of Human Apolipoprotein a-I With Dipalmitoyl Phosphatidylcholine
… which contain bilayers with a high degree of surface curvature are rapidly incorporated into micellar complexes at temperatures near and above the transition temperature. The highly reactive nature of the small vesicles is explained by the marked curvature of the lipid bilayer which affects …
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Computation of Breast Ptosis from 3D Scans of Torso
… of three-dimensional (3D) features such as surface curvature, coronal projection and surface normal for the assessment of breast ptosis using 3D scans of the torso. Experimental results suggest that 3D features are successful for objectively categorizing breast ptosis with high accuracy and …
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Effects of electrode surface roughness on motional heating of trapped ions
… noise has been studied in patch potential and surface adsorbate models, only smooth surfaces are accounted for by current theory. The effects of roughness, a ubiquitous feature of surface electrodes, are poorly understood. We investigate its impact on electric field noise by deriving a …
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On the Shape of the Free Surface of a Rubber-Like Material in Proximity to a Rigid Contactor
… pioneering work on the wrinkling of a free surface with residual stress and investigate the wrinkling of residually stressed solid films subjected to van der Waals or other types of interaction from a proximate contactor. We consider an incompressible rubber-like film of infinite depth, …
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A structured light solution for detecting scapular dyskinesis
… light computer vision approach to create a surface map of the soft-tissue across the scapula. This surface map is then analysed using surface curvature analysis techniques to identify the key clinical parameters associated with scapular dyskinesis. The main advantage of this method is that …
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The Effects of Surface Topography on Droplet Evaporation and Condensation
… phase-change heat transfer enhancement, surface chemistry and energy system optimization. Especially, in the past two decades, the rapid development of the nature-inspired non-wetting surfaces has promoted the applications of droplet-based phase change phenomena in various scenarios. …
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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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