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 764 for “"Microstructures"”.
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Quantifying Dislocation Microstructures
… data to continuum fields, as a means to quantify microstructures. With this method, we studied how different methods of initializing the microstructure in discrete dislocation dynamics simulations affects the resulting microstructure. We found that not considering cross-slip leads to very …
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Ordered photonic microstructures
This thesis examines novel photonic materials systems possessing order in the atomic, microscopic, and macroscopic dimensional regimes. In the atomic order regime, a structure-property investigation is done for Er203 in which the first report of room temperature photoluminescence (PL) is provided. …
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THE MICROSTRUCTURES OF ESTUARINE PARTICLES
A systematic study of the surface properties of suspended and bed sediments from the Tamar Estuary and Restronguet Creek was carried out using a nitrogen adsorption technique. The surface areas and porosities of the particles were determined using BET theory and capillary models applied to the gas …
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INFRARED SENSORS USING SILICON MICROSTRUCTURES
Interest in being able to see in the dark has spurred the exploration of infrared imaging systems. There are basically two groups of detectors: photon detectors and thermal detectors. The high costs of cooling apparatus and infrared ( lR ) sensitive materials restrict the wide application of the …
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Mechanics of planar periodic microstructures
The deformation of two-dimensional periodically patterned elastomeric sheets has been shown to trigger interesting pattern changes that are both repeatable and predictable (Bertoldi et al., 2007). Here, both square and hexagonal lattices of these sheets under axial compression are investigated both …
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Computational electrohydrodynamics for fabricating polymer microstructures
… manufacturing. The process is discussed here for microstructures of 1 µm to 200 µm in size. The range at which the processes work is not fully understood, however the EHDIP process has been shown to work at a nanoscale producing structures around 100 nm in size. From a comprehensive literature …
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Coherent optical nonlinearities in semiconductor microstructures
… optical nonlinearities in semi-conductor microstructures. Two distinct effects are studied. In the first part the excitonic optical Stark effect in InGaAs and GaAs multiple quantum-well structures is investigated by means of pump-probe spectroscopy. For nonresonant excitation below the …
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Demolding of hot embossed polymer microstructures
… deepen the understanding of demolding of polymer microstructures in order to facilitate mass manufacturing of polymer-based devices with micro-scale functional features, such as microfluidic chips. A theory of demolding mechanics has been proposed that combines the effects of thermal stress, …
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Formation and processing of rheocast microstructures
(cont.) given slurry was proposed. The fluidity of rheocast A357 alloy slurries was contrasted with the fluidity of superheated liquid. Rheocast slurries with 37% solid particles,were found to flow about half as far as fully liquid alloy superheated 20⁰C above the liquidus.
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Accurate FE-simulation of three-dimensional microstructures
This thesis presents the development and the application of a software tool ADAPTREF with which to automatically control the accuracy of simulation results obtained by finite element (FE) computations. It is especially designed to meet the requirements that are present when simulating …
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The applications for 3d inverse opal microstructures
… the fabrication process of 2-D and3-D colloidal microstructures. The second and third chapter will focus on the MEMS devices and a DSSC in order to show the potentials of these 3-D microstructures for various applications.
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Deformation Behaviour of NiCo Multilayers with Modulated Microstructures
… mechanisms in NiCo multilayers with modulated microstructures. More specifically, a targeted study is performed to understand the influence of interfacial plastic interactions between multilayer features on the overall deformation behaviour. For this purpose, a wide range of multilayer …
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Non-destructive Electrical Characterization of Controlled Waspaloy Microstructures
In this research, controlled Waspaloy microstructures were produced with the objective of studying microstructural evolution in this alloy via electrically-based ac/dc non-destructive techniques. Correlations were developed between electrical measurements and alternate characterization techniques …
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Additively Manufactured Bioinspired Microstructures for Active Surface Modification
… have facilitated the development of bioinspired microstructures, which hold promise for applications, such as liquid transport, self-cleaning, and anti-icing. However, the controllability of these microstructures remains an area requiring further exploration. This research explores the design, …
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Formulation and stability of model food foam microstructures
Many foods contain large amounts of saturated fatty acids (SaFa), which are considered unhealthy, and their presence in the diet is one of the contributing factors of cardio-vascular disease, obesity and the inherent risk of diabetes. It has become the driver of food producers to manufacture …
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Excitonic optical nonlinearities in semiconductors and semiconductor microstructures.
… in semiconductors and semiconductor microstructures. The main emphasis is placed on the evolution of optical nonlinearities as one goes from bulk to quantum-confined structures. Included are experimental studies of molecular-beam-epitaxially-grown bulk GaAs and ZnSe, GaAs/AlGaAs …
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Modeling and Simulation of Integrated Microstructures and Systems
To overcome the shortcomings of the above mentioned approaches, the goal of our research is to develop accurate computer-aided design tools and integrated design flow methodologies that provide orders-of-magnitude reduction in design and simulation cycle time; thus the cost of integrated …
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Orientation of Ceramic Microstructures by Hot-Forming Methods
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.
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