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 “"Optical models"”.
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Evaluation of a semi-analytical approach to the retrieval of water quality parameters from optical data in European coastal Case-II waters
… validity of radiative transfer theory and bio-optical models that have been developed primarily for open ocean waters. To obtain water quality parameters from reflectance measurements we employ a non-linear inversion method (Gauss-Newton). Algorithm parameters are established to ensure …
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Optical modeling of organic electronic devices
… or excitons in organic materials necessitates optical models that extend beyond classical far field methods. In this thesis we propose an extended near field calculation method using dyadic Green's functions and demonstrate the applications of both our extended model and traditional far field …
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A measurement of the diffraction scattering of pions and protons from complex nuclei using multiwire proportional counters
… first measurements at high energy for pions. Two optical models are described and compared with the results. Radius parameters are obtained for each nucleus from the slope of the differential cross section and fit to an equation of the form R = r o A 1/3 + C where A is the atomic number. The …
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Performance and Analysis of a Deployable Diffractive Optical Element for Small Satellite Missions
… and more deployable instrumentation, diffractive optical elements (DOEs) offer a compelling alternative to traditional optics. Their ability to focus light through engineered phase profiles rather than curved surfaces allows for large-aperture, flat optics that are far lighter and easier to …
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Resolving oxidation phenomena in layered semiconductors and scaled heterogeneous integration for low-power electronics
… complex dielectric function (ε), enabling optical modelling of multi-layer heterostructures. Combined with the various modes of SIE operation, it has the potential to unlock fast, high-throughput, large-area capability to better understand material stability and oxidation mechanisms, as …
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Fluorescence in reef corals
… conditions. This part of my work will benefit optical models that calculate light interaction with the bottom of the ocean in shallow waters. Lastly I present a prototype Fluorescence Imaging Laser Line Scanner system and discuss its potential use as a remote sensing system for reef mapping and …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… fisheries, and the global carbon cycle. Current models describing the relationship between optical properties and chlorophyll do not account for much of the optical variability observed in natural waters, because of the presence of seawater constituents that do not covary with phytoplankton …
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Oceanic Light Absorption Properties: Assessment and Characterization in the Southeastern Bering Sea Using Field and Satellite Observations
… measurements of physical, biological and optical properties have considerable potential for monitoring and measuring the effects of climate-driven changes on this ecosystem. A major shortcoming to obtain accurate estimates of optically active components (such as colored dissolved organic …
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Halide Perovskites for Photovoltaics and Light-Emitting Diodes
… dissertation focuses on the correlation between optical and electrical properties of halide perovskites and their remarkable performance. Bandgap tunabilities of halide perovskites in blue to green regions through mixing Br-and Cl-and in near infra-red region by substituting Pb2+ with Sn2+ are …
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Wavefront modelling and sensing for advanced gravitational wave detectors
… was subsequently followed up by observations by optical and radio astronomers — the first time an astrophysical event was observed by two completely separate astrophysical signals. This marked the beginning of multi-messenger astronomy. Since then 90 astrophysical events have been observed using …
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Modeling Of Mouse Eye And Errors In Ocular Parameters Affecting Refractive State
… to be researched upon. From rodents family mice models are encouraged over rats because of availability of genetically engineered models. Despite of extensive work that has been performed on mice and rat models, still no one is able to quantify an optical model, due to variability in the reported …
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Investigation of physical and electro-optic diffractive structures for energy-efficient smart window applications
… its ability to have control over the window’s optical properties such that they adapt to changing environments. A wide variety of technologies to improve window efficiency have been researched to date, including various mechanical and optical methods, but none has shown the ability to …
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In the Mouth of the Cave: Subterranean Site-Specific Writing Practices in Britain from William Wordsworth to Katrina Palmer
… is organised in two parts, the first developing models for reading sculptural relief in what Roland Barthes has described as the ‘stereographic plurality’ of the text. Katrina Palmer’s End Matter (2015) identifies the memorial function of sculpture in Portland’s displaced limestone, a deep and …
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Modeling Nutrient and Plankton Processes in the California Coastal Transition Zone
<p>Two time- and space-dependent, physical-bio-optical models have been developed for the California Coastal Transition Zone (CTZ) region with the overall objective of understanding and quantifying the processes th at contribute to the spatial and temporal development of nutrient and plankton …
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The fundamental role of spectral scattering in the ocean colour Phytoplankton Functional Type signal
… of Phytoplankton Functional Type (PFT) optical signals, in order that satellite radiometry may be used to detect ecologically relevant phytoplankton assemblage changes. This understanding can best be achieved with biophysically and biogeochemically consistent phytoplankton Inherent …
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Multilayer solar selective coatings for high temperature solar applications: from concept to design
… contains aspects of very high novelty including optical simulation, coating deposition using cathodic vacuum arc (CVA) and advanced characterization. The computer program CODE was used to simulate the reflectance spectra of different complete coating. Simulated reflectance spectra were compared …