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 73 for “"optical methods"”.
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Enabling Biomedical Imaging Diagnostics using Optical Methods
<p>This thesis work applies optical schemes to existing biomedical imaging techniques to improve the performance of present state-of-the-art biomedical imagers, and is in two parts. In the first part, a fast and simple optical time-gate scheme for counting single photons is presented. The gate is …
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Rheological characterization of LDPE and PMMA with optical methods
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
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Optical methods for monitoring biological parameters of phototropic microorganisms during cultivation
… wave is a sinusoidally intensity-modulated optical wave stemming from a point-source of light, which propagates through diffuse medium and exhibits amplitude and phase variations. Light propagation though strongly scattering media can be described by the P1 approximation to the Boltzmann …
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Characterization of developing porcine cortical bone: applications of mechanical and optical methods
… changes and nutritional disease using several methods of characterization. The main characterization techniques are as follows: reference point indentation (RPI), compression testing, quantitative backscattered electron (QBSE) imaging, and nanoscale dynamic mechanical analysis (nanoDMA). The …
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An investigation of optical methods for the mapping of microgradients of hydrogen-ion concentration within dental biofilms
… At present, the most commonly employed methods include the use of microelectrodes, whether through insertion into laboratory grown biofilm or incorporated within in vivo prosthetics devices. These methods are not without their drawbacks. In the act of measurement, microelectrodes are …
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Development of nanoscale biosensors for cancer related proteases and blood-borne pathogens based on electrochemical and optical methods
… beads and probe nucleic acid on the glass or optical fiber surface has been achieved. This assay will be incorporated into a simple hand-held device for routine assays in hospitals and clinics, or for large-scale screening of human populations as diagnostic tools to identify specific viral …
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Language processing supporting cognitive performance: an investigation of children’s and adults’ inner speech using behavioral, electrophysiological and optical methods
… with behavioral and neuroscientific methods. One study addressed the role of self-directed speech in the interplay between language skills and cognition by using the Tower of London task in children. Two studies addressed the neural correlates of the differences between inner and …
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Longitudinal Visualization of Neurodegeneration: Digital Biopsy of the Retina
… major aims of this dissertation are to explore optical methods for a digital biopsy and demonstrate their utility in animal models of disease. In this dissertation, traditional ophthalmology methods were augmented with emerging optical techniques and biological markers to track inflammatory …
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Applications of the Optical Method of Caustics to the Study of Viscoelastic Dynamic Fracture and Static Blunt Crack Fronts
The opto-mechanical relation, as used in the optical methods of photoelasticity and caustics, are extended to linearly viscoelastic materials. The Maxwell-Neumann relation for the stress-optic constants, which is good for linearly elastic behavior, is replaced by an expression derived from the …
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Preliminary investigation into the cracking of polyurethane
… specimen geometries were used to “benchmark” the optical methods. Tests have been run to determine the surface effect on a straight front crack. Results of these tests were compared with analytical results and related to LEFM concepts.
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Localisation and navigation in GPS-denied environments using RFID tags
… In addition dust and debris may hinder optical methods for ranging. This study looks at the feasibility of using randomly distributed RFID tags to autonomously navigate in this environment. Clustering of observed tags are used for localisation, subsequently value iteration is used to …
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DEVELOPMENT OF PHASE RETRIEVAL TECHNIQUES IN DISPLACEMENT AND DISPLACEMENT DERIVATIVES MEASUREMENT
… derivatives measurement using coherent optical methods. A Teager-operator based algorithm called DHODA and a novel fringe orientation and density map based fringe analysis technique are proposed for phase derivatives determination. A derivative based simplified phase tracker model is …
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Nanopatterned anchoring layers for liquid crystals
… then their anchoring energies are measured using optical methods. It is shown that nanopatterned grooves are capable of producing anchoring energies which can span an order of magnitude or more across a single substrate and vary across extremely small regions (< 1 [mu]m).
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Seasonal Pattern and Sources of Particulate Carbon in Kananaskis and Calgary, Alberta
… and Calgary were assessed using thermo-optical methods. Vehicle exhaust was inferred to be dominant source of carbon throughout the year with an identical OC/EC of 22±14 in Calgary and 22±5 in Kananaskis in dry deposition. Biogenic OC signal was absent in Kananaskis in precipitation or …
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Performance and analysis of the plasma bipolar junction transistor: Control of the surface electrical properties
… densities are characterized using electrical and optical methods. Using this device as a platform, coupling of the electron-ion plasma (gas phase plasma) and the electron-hole plasma (semiconductor) in terms of secondary electron ejection into the gas phase was investigated experimentally and …
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Development of Optical Tools and Techniques Toward a Functional Connectomic Understanding of C. elegans
Optical methods to study C. elegans behavior and neural activity are popular and wellestablished in the field, but many of the most commonly used optical tools leave much to be improved upon. In this research I sought to establish the utility of new optical tools in C. elegans to address the …
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Computational imaging and automated identification for aqueous environments
… necessary for biology and ecology, ideal for optical methods. Algorithms that work with existing SeaBED AUV imagery are developed, including habitat classi fication with bag-of-words models and multi-stage boosting for rock sh detection. Methods for extracting images of sh from videos of …
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Negative Surface Ionization and Electron Affinity by Mass Spectrometry
… detection system has been designed. The kinetic methods of Page were applied to the results, and from non-zero gradients of the plots of the ratio the electron to jon current E', the apparent electron affinity was evaluated. The values of E, the actual electron affinity were then calculated from …
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Computational imaging and automated identification for aqueous environments
… necessary for biology and ecology, ideal for optical methods. Algorithms that work with existing SeaBED AUV imagery are developed, including habitat classification with bag-of-words models and multi-stage boosting for rock sh detection. Methods for extracting images of sh from videos of …
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