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 63 for “"scattering properties"”.
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Scattering properties of polyacrylamide gels and their relation to protein electrophoretic migration
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994, and Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Streuverhalten von texturierten TCO-Substraten in Silizium-Dünnschichtsolarzellen
In this PhD thesis the scattering properties of textured transparent conducting oxides (TCO) for the application in thin-film silicon solar cells are investigated. The main focus is the correlation between the nanotextured surface and its scattering behaviour. Therefore a ray tracing model based on …
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The Microphysical and Radiative Properties of Tropical Cirrus From the 2006 Tropical Warm Pool International Cloud Experiment (twp-Ice)
… ice crystal shapes and concentrations on bulk scattering properties of tropical cirrus are quantified. The calculated mean asymmetry parameter g¯ for the fresh anvil (i.e., 2 Feb) is larger than that for cirrus bands of varying ages (i.e., 27 and 29 Jan.) for -60 < T < -45°C and -45 < …
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Soliton Scattering on Obstructions in Relativistic Theories
We present results of our studies of various scattering properties of topological and non-topological solitons on obstructions in the form of holes and barriers in (1+1) and (2+1) dimensions. These obstructions, barriers and holes, are inserted into the potential of the theory via the coupling …
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Characterizing optical properties in fibrous tissues
… tissues and anisotropic tissues. The optical properties of isotropic tissues such as adipose tissue are independent of measurement direction. However, optical properties of anisotropic tissues such as tendon are different along different measurement directions. We used Monte Carlo simulation …
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Bioinspired scattering materials: light transport in anisotropic, disordered systems
… turbid media to the fabrication of white paint. Scattering in a disordered system is determined by the spatial distribution and the scattering properties of its building blocks. To date, most efforts on scattering optimisation have focused on isotropic, high refractive index systems. This thesis …
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Parity-time and supersymmetry in optics
… regions of gain and loss exhibit intriguing properties which are otherwise unattainable in traditional Hermitian systems. We show that selective PT symmetry breaking offers a new method for achieving single mode operation in laser cavities. Other interesting phenomena also arise in connection …
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LIGHT SCATTERING FROM AMMONIA AND WATER CRYSTALS
… Jupiter's upper clouds, but both their shape and scattering properties were unknown at the start of this work. Ammonia crystals and water crystals were grown in a cold chamber at temperatures 20°C below their freezing points (0°C and -77.7°C, respectively). The H₂O crystals formed had shapes in …
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Cloud Observations from the Mars Science Laboratory Mission: Seasonal Variability, Scattering Phase Function, and Validation of Optical Depths using Lidar Measurements of Terrestrial Cirrus Clouds
… of the seasonality, opacity, spacing, and scattering properties of the clouds that appear in the observations. The cloud opacities were validated by testing the high cloud method by imaging high altitude cirrus clouds using a radiometrically calibrated camera and captur- ing simultaneous …
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Novel Cladding Designs for Engineering Electromagnetic Scattering
… characterized by their unique ability to exhibit properties not found in natural substances, have paved the way for a wide range of applications, particularly in the areas of next-generation antenna designs and electromagnetic cloaking. In this thesis, we propose antenna systems that address the …
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Characterization of Protein Interactions in Eye Lens Crystallin Proteins and Crystallization
… of these interactions through light scattering properties of dense suspensions. One context where protein interactions have an impact on the state of aggregation is in protein crystallization. Crystallization of globular macromolecules is a difficult process. Often identification of …
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Photon migration in highly scattering media as a measurement technique on automated cow milking systems
An investigation has been performed on the scattering properties of cow's milk. The main aim of the study has been to determine the usefulness of photon migration techniques in the measurement of milk components, and the extent to which they can be applied. Online applications are also …
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Analysis of periodic structures using finite-difference time-domain method
… FDTD/PBC approach is introduced to analyze the scattering properties of general skegrid periodic structures. The approach is simple to implement and efficient in terms of both computational time and memory usage. In addition, an efficient hybrid FDTD generalized scattering matrix (GSM) technique …
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Non-invasive assessment of bacterial biofilm in the middle ear using low-coherence interferometry/optical coherence tomography and acoustic measurements
… video otoscope to provide depth-resolved optical scattering properties of the middle ear. An automatic algorithm was written to classify the LCI/OCT data to detect the presence of biofilm behind the TM and therefore distinguish the chronic infection. The acoustic measurement provides …
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Scattering design : absorption enhancement and frequency selective metasurfaces
… we develop frameworks to study and design the scattering properties in two kinds of systems. For the first problem, we find approximate angle/ frequency-averaged limits on absorption enhancement due to multiple scattering from arrays of "metaparticles", applicable to general wave-scattering …
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Generalized quantum defect methods in quantum chemistry
… to examine both bound states and free electron scattering properties of molecular systems, which are characterized by a Rydberg/scattering electron incident on an ionic-core. An ab initio computation of the reaction matrix for fixed molecular geometries is a substantive but important theoretical …
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Synthesis and characterization of nanostructured catalysts for photovoltaic applications
… (TiO2) nanoparticles on the electron transport properties and light harvesting potential in a dye sensitized solar cell (DSSC). Particular attention was given to develop synthetic methods to produce metal oxide photocatalysts with similar crystallite size, with different morphologies (spheres, …
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Studying DNA-Directed Nanoassembly, Hybridization and Mismatch-Discrimination via Plasmon Scattering of Gold Nanoparticles
… research study combined the exquisite plasmon scattering properties of spherical gold nanoparticles (nAu) and the specific recognition attributes of DNA to investigate the nAu-DNA assembly formation, and to apply the nanoassemblies for DNA detection. The nanoassembly structures, successfully …
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Interferometric Synthetic Aperture Microscopy (ISAM) Reconstruction and Characterization in a High Numerical Aperture System
… samples at high resolution based on their scattering properties. Interferometric synthetic aperture microscopy (ISAM) is a newer technique that can overcome the typical dependence between lateral resolution and depth-of-focus of an optical coherence tomography (OCT) imaging system by …
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Radar Altimetric Studies of Polar Ice
… treatment is made of the electromagnetic properties of snow and ice at 13.81 GHz, and the differences between various polar surface media are highlighted. Theoretical and empirical models are presented which enable calculation of the relevant dielectric and scattering properties of snow …
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