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 16 of 16 for “"thin structures"”.
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Bifurcations, Multi-stability, and Localization in Thin Structures
Thin structures exist as one dimensional slender objects (hairs, tendrils, telephone cords, etc.) and two dimensional thin sheets (tree leaves, Mobius bands, eggshells, etc.). Geometric and material nonlinearities can conspire together to create complex phenomena in thin structures. This …
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First-order gradient regularisation methods for image restoration: reconstruction of tomographic images with thin structures and denoising piecewise affine images
… in image and data space for reconstruction of thin structures from PET data and regularisers given by an infimal-convolution of TV and $L^p$ seminorms for denoising images with piecewise affine structures. In the first part of this thesis, we present a novel variational model for PET …
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DeepMVS: learning multi-view stereopsis
… particularly for near-textureless regions and thin structures.
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Analytical Modeling and Equivalent Electromechanical Loading Techniques for Adaptive Laminated Piezoelectric Structures
… a significant issue, such as modeling very large thin structures, alternate modeling techniques are sometimes required. Much of the focus of this thesis was to introduce equivalent methods for modeling laminated piezoelectric beams and plates. Techniques are derived based on classical beam and …
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Modelling of semiconductor nanostructures : electronic properties and simulated optical spectra
III-V semiconductor nanostructures are widely used in optoelectronic devices (e.g. lasers and detectors) in the visible (0.4-0.8 μm), near-infrared (0.8-3 μm), mid-infrared (3-5 μm) and far-infrared (> 8 μm) wavelength ranges, with great potential for high performance and high temperature …
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Reduced-Order Modeling and Design Optimization of Thermomechanical Shape Memory Alloy-Based Bistable Microactuators and Hyperelastic Material Systems
… achieved using incompatible displacement modes within a variational framework, ensuring stable and accurate results even for thin structures and nearly incompressible materials. Building on this, a fully thermomechanically coupled SMA material model is developed within the generalized standard …
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Fast Large-Scale Electromagnetic Simulation of Doubly Periodic Structures in Layered Media
… electromagnetic simulation of doubly periodic structures embedded in layered media, which can be commonly found in extreme ultraviolet (EUV) lithography, metasurfaces, and frequency selective surfaces. Such problems can be solved by rigorous numerical methods like finite-difference time-domain …
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A Quadratic Non-Linear Elasticity Formulation for the Dynamic Behaviour of Fluid-Loaded Structures
… interaction problems involving long thin structures, which are common multi-physics problems encountered in many applications. In most fluid-structure interaction problems the deformation of the slender elastic bodies is significant and cannot be described by a purely linear analysis. …
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Accurate FE-simulation of three-dimensional microstructures
… problem and which, for multi-physically active thin structures, is derived on the basis of a functional analytical framework. In addition, a refinement strategy and a geometrical split pattern are required in order to be able to implement a reliable and stable software tool with which to control …
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Transfer printing of nitride based light emitting diodes
… printing of 2 µm-thick micron-size LEDs. The thin structures were assembled onto mechanically- flexible substrates in a representative 16x16 array format using a modifed dip-pen nano-patterning system. Two different methods of addressing the LEDs were studied by using conductive inks on the …
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Engineering Application-Specific Plasmonic Nanoparticles: Quantitative Measurements and Precise Characterization
… are discussed and characterized. These novel structures are akin to nanowires, but with a small, rectangular cross-sectional geometry. Gold nanobelts are shown to exhibit a strong transverse resonance that has never been reported previously in nanowires. The transverse resonance is shown to …
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Electromechanical Modeling of Piezoelectric Energy Harvesters
… piezoelectric energy harvesters are cantilevered structures with piezoceramic layers that generate alternating voltage output due to base excitation. This work presents distributed-parameter electromechanical models that can accurately predict the coupled dynamics of piezoelectric energy …
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Confined wrinkling of thin elastic rods, sheets and cones
Thin-walled structures, such as plates and shells, become more vulnerable to in-plane compressive effects as their thickness is reduced, where they may buckle out-of-plane at lower than operational loads. Here, a novel approach allows the thin structures to buckle, but within a prescribed …
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Simulation of deformation and fracture in very large shell structures
… essential in the practical design of very large thin structures such as aircraft fuselages, ship hulls, automobiles, submarines, and pressure vessels. In many applications, fracture is a critical design concern, and thus the ability to numerically predict crack propagation in shells is a highly …
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Effects of Fused Filament Fabrication Process Variables on Microstructural Alignment and Intra-layer Properties in PLLA
… 3D printing is commonly used to produce complex structures from thermoplastics. Conventional fused filament fabrication (FFF) is used widely and forms objects through layer-by-layer deposition. However, there is often a need for thin support structures based on single print layers, for example in …