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 26 for “"Scattering coefficient"”.
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A Method for Characterizing the Properties of Industrial Foams
… were varied include the layer thickness, the scattering coefficient, and the asymmetry parameter. Layer thicknesses between 8.5 mm and 18 cm were considered. Values of the scattering coefficient ranged from about 600 m-1 to 14000 m-1, while the asymmetry parameter varied between 0 and 1. A …
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Geologic interpretations of seismic scattering and attenuation for the Cianten Caldera and the surrounding area
… Lapse Analysis (MWTLA) to find values for the scattering coefficient, go, and the seismic albedo, [Beta]o, of the Cianten Caldera. The scattering coefficient describes the amount of seismic energy that is attenuated due to the wave scattering off of heterogeneities and the seismic albedo is the …
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In Vivo Assessment of the Forward to Backward Ratio of Second Harmonic Generation By Collagen As Part of a Non-Invasive, All-Optical Biopsy for Skin Cancer
… C’s dependence on a property of the tissue, the scattering coefficient. We also ran the simulation in a thin biopsy sample to model the collagen samples used experimentally in this project and observed C’s dependence on the scattering coefficient.
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Measurement of tissue optical properties during mechanical compression using swept source optical coherence tomography
… penetration depth in tissue due to its highly scattering properties. The highly disordered refractive index distribution in tissue leads to multiple-scattering of incident light. It has been hypothesized that mechanical compression has a great potential to enhance the capabilities of laser …
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Wavelength tuneable frequency domain photon migration spectrometer for tissue-like media
… instrument estimates the absorption and reduced scattering coefficients with a precision of 3% and 6%, respectively. Optical properties of Intralipid were measured from 710-850 nm in the therapeutic window. The results were compared with published data measured by other methods and similar …
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Assessment and Diagnosis of Human Colorectal and Ovarian Cancer using Optical Imaging and Computer-aided Diagnosis
<p>Tissue optical scattering has recently emerged as an important diagnosis parameter associated with early tumor development and progression. To characterize the differences between benign and malignant colorectal tissues, we have created an automated optical scattering coefficient mapping …
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Applying Mechanistic Understanding of Optical Absorption and Scattering Phenomena to Enhance the Spectroscopic Analyses of Pharmaceutical Materials
… spectroscopy to separate absorption and scattering behaviors when NIR light interacts with pharmaceutical materials. The separated absorption and scattering were utilized to enhance mechanistic understanding of NIR diffuse reflectance spectroscopy and improve practical spectroscopic …
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Computationally Efficient Modeling of Transient Radiation in a Purely Scattering Foam Layer
… thickness, the asymmetry parameter, and the scattering coefficient. Layer thicknesses between 4 cm and 20 cm were considered. Values of the asymmetry parameter varied between 0.2 and .08, while the scattering coefficient ranged from 2800 m-1 to 14000 m-1. Ten blind test cases with parameters …
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Detection and interpretation of fluorescence signals generated by excitable cells and tissues
… practical implementation.</p> <p>Part 2: Light-Scattering Models for Interpretation of Fluorescence Data<br />Current interest in understanding light transport in cardiac tissue has been motivated in part by increased use of voltage-sensitive and Ca<em> i</em>2+-sensitive fluorescent probes to …
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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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Detecting cervical dysplasia with quantitative spectroscopic imaging
… measuring the per-patient normalized reduced scattering coefficient alone accurately performs the distinction. This is in good agreement with our previous contact-probe study of HSIL. Due to improved accuracy, QSI used as an adjunct to colposcopy can potentially reduce the number of …
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Spatial Localization and Temporal Analysis of Optical Property Fluctuations by Multiplexed Near -Infrared Photon Density Waves in Turbid Media: In Vitro and in Vivo Studies
… mostly due to the fluctuations in the absorption coefficient caused by oxy- and deoxy-hemoglobin changes in the tissue. The temporal analysis of the signal resulting from this process is studied in detail, and I also introduce a time-series data analysis technique that has not been applied to this …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… in two seasons. The summed contribution to scattering of individual particles in the size range of 0.1-50 Cpm accounted for approximately the entire scattering coefficient measured independently using bulk methods. In surface waters in both seasons, the large diameters and n' of eukaryotic …
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Modeling of light propagation in skin, and an application to noninvasive diagnostics
… effect which is based upon changes of the light scattering coefficient in the upper dermal regions of skin induced by glucose dissolved in the interstitial fluid. We will focus on the identification of this coefficient in vivo. As we want to probe our tissue with decoherent light of a single …
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Geometric Acoustic Modeling of the LDS Conference Center
… models of the hall using published absorption coefficients for its surfaces and approximate scattering coefficients based on current best-known techniques. A detailed analysis determined the minimum numbers of rays needed in both packages to produce reliable results with these coefficient …
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Charge and momentum transfer processes for gas-phase nanoparticles.
… collision cross sections, a non unity momentum scattering coefficient (ξ = 1.36) was considered to account for diffuse collisions between gas molecules and protein ions. The effective density of protein ions electrosprayed from non-denaturing solution was 0.96 g cm-3 while that from denaturing …
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Optical methods for monitoring biological parameters of phototropic microorganisms during cultivation
… of interest are often undiluted and highly scattering and do not adhere to Beer-Lambert's law. Due to the fluorescence properties of chlorophyll, fluorescence spectroscopy techniques including fluorescence lifetime imaging and single photon counting could be applied to provide images of the …
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Spatial localization and temporal analysis of optical property fluctuations by multiplexed near-infrared photon density waves in turbid media: In vitro and in vivo studies
… or hematomas, is due to the diffusive, highly scattering nature of near infrared light propagation. I have studied and developed methods to improve the spatial localization of these inhomogeneities in biological tissues, especially for the application of functional studies of the human brain in …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… in two seasons. The summed contribution to scattering of individual particles in the size range of 0.1-50 μm accounted for approximately the entire scattering coefficient measured independently using bulk methods. In surface waters in both seasons, the large diameters and n' of eukaryotic …
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A Study of Asian Dust Events Using Surface, Satellite, and Aircraft Measurements During Intex-B
… this dust plume with higher averaged aerosol scattering ratios of 10.5 at 1064 nm and 2.0 at 588 nm and a depolarization of 25%. The DC-8 nephelometer also observed this dust event in-situ and confirmed that the highest scattering coefficient ranged from 80-100 mm'1. When this dust transported …
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