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 45 for “"single-scattering"”.
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A nonlinear least squares inversion to the single-scattering three-dimensional radiative transfer equation for satellite-based tomography
… This thesis will cover the development of a single-scattering 3-D radiative transfer inversion algorithm. By producing a single-scattering inversion algorithm, we can learn many lessons and gain insight on how the eventual development for a multiple scattering inversion model should be …
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Dynamic light scattering and diffusing wave spectroscopy studies of the microscopic dynamics of polystyrene latex spheres suspened in glycerol
… studied using the techniques of dynamic light scattering in the single scattering limit and diffusing wave spectroscopy in the multiple scattering regime using a charge coupled device [CCD] camera as our detector. Our experiments, which investigated suspensions of various concentrations …
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AN ANALYSIS OF LONGITUDE VARIATIONS IN THE EQUATORIAL SPECTRUM OF SATURN
… layer. They are modeled by variations in the single scattering albedo of the haze and in the specific abundance of gas in the haze. The ground based spectra, having a spatial resolution of 21,000 km, are consistent with a specific abundance of gas in the haze of 14 $\pm$ 1 km-amagats per mean …
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Combined multispectral/hyperspectral remote sensing of tropospheric aerosols for quantification of their direct radiative effect
Scattering and absorption of solar radiation by aerosols in the atmosphere has a direct radiative effect on the climate of the Earth. Unfortunately, according to the IPCC the uncertainties in aerosol properties and their effect on the climate system represent one of the largest uncertainties in …
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A physical model to estimate snowfall over land using microwave measurements
… frozen hydrometeors is significant. However, the scattering effect of snowfall in the atmosphere at those higher frequencies is also impacted by water vapor and supercooled water in the upper atmosphere.The Discrete Dipole Approximation (DDA) method was employed to generate the single scattering …
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Radiative transfer of ultrasound
… transfer theory is used to model the multiple scattering of diffuse ultrasonic waves in two types of random media. The first type is an isotropic, homogeneous medium containing randomly oriented, randomly located scatterers. The scatterers are assumed to be uncorrelated. This assumption allows …
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Low-energy electron diffraction effects at complex interfaces
Low-energy electron scattering was used as a tool to study electron-stimulated processes at complex interfaces. The electron diffraction in each complex interface is theoretically treated by a multiple scattering formalism for quantitative analysis. Mathematical descriptions of electron-stimulated …
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Remote measurement of aerosol optical properties using the NOAA POES AVHRR during ACE-1, TARFOX and ACE-2
… atmosphere. This algorithm combines linearized, single-scattering theory with an estimate of bi-directional surface reflectance. Phase functions are parameterized using an aerosol distribution model and the ratio of radiance values measured in channels 1 and 2 of the AVHRR. Automated cloud …
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A DNS capability for obtaining underwater light field and retrieving upper ocean conditions via in-water light measurements
… function of RTE under the approximation of single scattering. The preliminary trial of the inversion are being taken.
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Single and multiple electromagnetic scattering by dielectric obstacles from a resonance perspective
… theory of wave propagation through a multiple scattering environment and the SEM. Since the SEM is generally considered a theory for surface currents on conducting scatterers, extensions are made which permit, under certain conditions, a singularity expansion representation of the …
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Coherent Transport of Matter Waves in Disordered Optical Potentials
… responsible for the anisotropic character of the single scattering processes in the effective medium. Coherent multiple scattering leads to quantum interference effects, which entail a renormalization of the diffusion constant as compared to the classical description. This so-called weak …
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Atmospheric radiative transfer in multiple scattering conditions. Application to NWP models.
… properties of cirrus clouds. A new database of single scattering properties has been developed for mid latitude cirrus clouds. Ice clouds are treated as a mixture of ice crystals with various habits. The optical properties of the mixture are tested in comparison to radiometric measurements in …
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A new technique to find both real and imaginary index of refraction of atmospheric aerosols from clear sky radiance measurements.
… that affect retrieved index is assessed. Mie single scattering sensitivity simulations and radiative transfer simulations using a Gauss-Sidel routine are made to determine the sensitivity of polarized sky radiance to index, size distribution, surface albedo, and surface reflectance anisotropy. …
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Electromagnetic Scattering From a Strongly Turbulent Medium
… directions. When the fluctuation is weak, the single scattering theory is widely used and found to be satisfactory; however, as many practical situations are known to exist, if fluctuations are strong, the multiple scattering effect must be taken into account. In this report, two theoretical …
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The scattering and shrinking of a Gaussian wave packet by delta function potentials
… this thesis, we wish to test the hypothesis that scattering by a random potential causes localization of wave functions, and that this localization is governed by the Born postulate of quantum mechanics. We begin with a simple model system: a one-dimensional Gaussian wave packet incident from the …
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An analysis of K⁺-nucleon scattering
A partial-wave analysis of K⁺-nucleon scattering has been performed. Energy-dependent and energy-independent solutions for the isoscalar and isovector amplitudes are generated by fitting data with a chi-squared minimization technique. The isoscalar amplitudes extend to a K⁺ incident lab kinetic …
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The Scattering of H-alpha Emission Associated with the Rosette Nebula in the Monoceros Region Studied Using Polarimetry
… While this was not detected, polarization by scattering in a dust shell around the Rosette Nebula (NGC 2237-9) was observed. Scattered continuum light from the central star cluster NGC 2244 in the H-alpha bandpass was ruled out. Using Celnik's (1985) map of extinction across the Rosette Nebula …
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Wave scattering from cylindrical fluid inclusions in an elastic medium and determination of effective medium properties
… The solution is formulated by deriving the scattering from a single cylindrical fluid-filled inclusion in an attenuating elastic medium. The scattering vs. angle results are shown for a laboratory experiment in which a single water-filled cylindrical inclusion is embedded in polypropylene. …
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Monitoring Bacteria Cultures Using Near Infrared (nir) Binary Spectronephelometry (bsn), Raman Spectra and Principal Component Analysis (pca)
… media i.e., propagation of light occurs in the single scattering regime. A BSN "training set" associates a grid of elastic emission measurements, comprising Rayleigh and Mie scattering, and inelastic emission measurements, comprising fluorescence and Raman emission, with a grid of varying known …
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Wave propagation in complex media, scattering theory, and application to seismic imaging
… is essentially equivalent to solving an inverse scattering problem in structurally complex media. Conventional migration algorithms rely on linearized inversion schemes and assume single-scattering dominance. The primary focus of this thesis is an alternative nonlinear scattering-based approach …
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