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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 30 for “"Mie theory"”.
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Cavity ring down: Construction, validation and experiments measuring the optical extinction of pure clays and their mixtures with salts and carboxylic acids under a range of atmospherically relevant conditions
… (RH) revealing differences when compared to Mie theory generated from literature values for size or mass change. Second, internal mixtures of largely insoluble montmorillonite with sodium chloride or ammonium sulfate were studied and a lowering of the optically observed deliquescence RH was …
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Active hyperspectral imaging of chemicals on surfaces
… geometry, and surface reflectivity. Thus, Mie Theory calculations are performed on simulated materials and combined with information from sources such as Hapke [4], [20] to give qualitative insight into the expected shape and magnitude of reflectance spectra from sparse particles on a …
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Time resolved measurements of droplet growth in a Wilson cloud chamber
… in the scattered intensity as predicted by Mie theory. Scattered intensity is measured at 30 degrees to the He-Ne laser beam. Supersaturation ratios during growth range from S =1.2 to S = 3.5 for all three gases. The initial temperature is measured and the pressure is monitored continuously …
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Differential light scattering spectroscopy measurements for detecting and imaging cancer
… and to develop diagnostic algorithms based on Mie theory. The results show great promise for diagnosing cancer. Instrumentation is being developed to implement SD/LSS and /LSS together in a wide area imaging system with the goal of studying and detecting cancer at its earliest stages in vivo …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… properties were investigated. A combination of Mie theory and flow cytometry was used to determine the diameter, complex refractive index (n+n'i), and optical cross-sections of individual particles, based on a method developed in the laboratory using phytoplankton cultures. Individual particle …
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Validation of angle-resolved polarized light scattering spectroscopy as a diagnostic tool for pre-cancer detection
… from cell models such as the cell model based on Mie theory and the power-law model. At the same time, field-based microscopy was used to measure 3D refractive index distributions of single live cells and to provide intensity-based light scattering spectroscopy with a more realistic optical model …
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Studies of Passive and Active Plasmonic Core-Shell Nanoparticles and their Applications
… data when their sizes are extremely small. Mie theory is the solution to plane wave scattering by spheres and we extend the solution here to spheres consisting of an arbitrary number of layers. We discuss the resonance behaviors of passive CNPs with an emphasis on how the Coated …
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Investigation of the effects of colloidal suspension properties on spatially resolved diffuse reflectance
… is proposed. This approach incorporates Mie theory and particle size distribution function, followed by Farrell's diffuse approximation to model specified reflectance signal. The developed methodology does not require a calibration model and was used to investigate three main objectives. …
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Design of experimental apparatus for generation and measurement of an aerosol
… for our system. Chapter 2 discusses about the theory of ultrasonic atomization and evidence of faraday instability for atomization. Later setup of aerosol delivery system with two different set of atomizers is presented. In chapter 3, Laser interferometry principle and apparatus used for the …
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Development of a discrete numerical approach to the Fredholm Integral Method for evaluating microwave scattering by irregular hydrometeors
… and the exact method by Holt. However, the theory of the second Born term is relatively difficult. The approach taken by Hankel cannot be applied essentially because of the power of p in the integrand being odd. An alternative approach which still involves contour integration method uses …
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Practical electron cloaking in solids
… the expansion of partial waves, analogous to the Mie theory for electromagnetic waves, is proposed. As an example, the design of "invisible" core-shell nanoparticles is demonstrated, and its application in thermoelectrics is discussed, where it is shown a simultaneous enhancement of the Seebeck …
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Radiative transfer modeling of thermal infrared emissivity spectra: applications to martian regolith observations
… To date, no radiative transfer model (semiempirical, exact, or hybrid solution) has been able to adequately predict the nadir emissivity behavior of simple mineral assemblages. Few measurements have been attempted in the laboratory or field regarding directional emissivity effects of …
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Measuring ambient air quality using low-cost sensors
… least two years. Third, we designed and built a Mie Theory-based model for exploring the ability of low-cost particle sensors to accurately measure fine particles. We show the expected differences between two commonly used technologies under a variety of ambient conditions. Last, we demonstrate …
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Millimeter wave scattering by rain in an antenna's near field
… Spherical raindrops are treated using the Mie theory and non-spherical ones analyzed with Waterman’s Extended Boundary Condition Method. Computed values of forward scattering amplitudes and scattering cross-sections for both spherical and non-spherical raindrops at 80, 45, 70 and 90 GHz are …
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Scale closure in upper ocean optical properties : from single particles to ocean color
… properties were investigated. A combination of Mie theory and flow cytometry was used to determine the diameter, complex refractive index (n+n'i), and optical cross-sections of individual particles, based on a method developed in the laboratory using phytoplankton cultures. Individual particle …
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LIGHT SCATTERING FROM AMMONIA AND WATER CRYSTALS
… and Voyagers 1 and 2 with an approach based on Mie theory. Ammonia crystals are believed to be an important constituent of 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 …
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On the theory of the optical stretcher : optics, mechanics, and thermal effects
… analytical approach based on generalised Lorenz-Mie theory (GLMT) is adopted to describe the electromagnetic fields, intensity, and surface stresses in the OS. To model the optical properties of particles with different internal structures and shapes, the theory is provided for multi-layered …
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
… using the anomalous diffraction approximation of Mie theory. At six different light levels ranging from 60 - 1500 μmol photons m-2 s-1 (specific growth rates from ~0.2 to ~0.7 d-1), cell division was tightly phased to the light:dark cycle, occurring soon after dark. There were pronounced diel …
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Nanophotonics for dark materials, filters, and optical magnetism
… for a magnetic optical material. Using Mie theory, the microscopic origin of the magnetic response is explicitly identified as being due to the magnetic dipole resonance of an isolated sphere. This provides a design basis, and dielectric and lattice requirements with candidate …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
… experimental photoacoustic absorption data with Mie theory calculations. This resulted in the identification of C60 particles with a mobility diameter of 150 nm to 400 nm as an absorbing standard at wavelengths of 405 nm and 660 nm. Copper particles with a mobility diameter of 80 nm to 300 nm are …
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