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 25 for “"scattering coefficients"”.
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SCATTERING OF ELECTROMAGNETIC PLANE WAVES FROM TWO INFINITELY LONG PARALLEL CYLINDERS OF ARBITRARY MATERIALS AT OBLIQUE INCIDENCE.
The Mueller scattering matrix elements (S(ij)) and the cross-sections for the scattering of an electromagnetic plane wave from two infinitely long, parallel, circular cylinders at oblique incidence are derived. Each cylinder can be of arbitrary materials (any refractive index). The incident wave …
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Development Of A Supercontinuum Based Photoacoustic Aerosol Light Absorption And Albedo Spectrometer (PALAAS)
… instrument to measure the light absorption and scattering coefficients of aerosols. Collimation techniques for supercontinuum sources using lens-based and off-axis parabolic mirror-based collimators were evaluated and it was determined that the off-axis mirror had superior collimation abilities …
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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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Physical and Chemical Properties of Laboratory and Ambient Aerosols Related to Climate Change
… agreement between measured and predicted total scattering coefficients (sigmasp) at RH = 80% from 35% to 11%. The closure experiment revealed the importance of keeping the nephelometry system isothermal when measuring particle scattering coefficients as a function of RH or as particles exist in …
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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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Stability of fluid-loaded structures
… structural acoustics approach and take a "wave scattering" --as opposed to a "modal superposition"-- view of the fluttering plate problem. First, we derive the energy balance relations for the extended plate (i.e., plate with two sided flow, spring foundation and plate pretension) and define a …
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Aerosol particle light scattering at a perturbed mid-latitude continental northern hemisphere site and its dependence on relative humidity, wavelength of light, particle size and composition
… the upscatter fraction ($\beta$), and the mass scattering efficiency, ($\alpha$). These three parameters can be estimated from regional measurements of total light scattering and back-scattering coefficients as functions of relative humidity, particle composition and size, and wavelength of …
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Applications of Imaging Spectroscopy in Forest Ecosystems at Multiple Scales
… and nutrients. Reflectance values and W scattering coefficients produced successful nitrogen models across loblolly pine plots at the canopy scale. Regression models showed similar explanatory power for nitrogen, although W scattering coefficients were significantly correlated with …
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Material property extraction procedure for electromomentum coupled metamaterials
… properties of a sample from measurements of its scattering coefficients and associated property extraction algorithms. Namely, the works of Song and Bolton to measure the complex impedance and wavenumber or phase speed and attenuation [J. Acoust. Soc. Am., 107(3), pp. 1131-1152, (2000)], Fokin et …
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Image and Optical Property Reconstruction From Noninvasive Measurements of Turbid Media, in Vitro and in Vivo: A Promising Method for Optical Mammography
… the relative index of refraction, absorption and scattering coefficients of objects immersed in highly scattering media. In this thesis I describe a model for locating and characterizing optical inhomogeneities in a turbid medium. I will go on to discuss limits of the technique and present data …
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Photothermal and Photochemical Tumor Response to Carbon Nanotube Mediated Laser Cancer Therapy
… Optical properties (absorption and reduced scattering coefficients) of solutions and tissue phantoms containing carbon nanotubes were measured with spectrophotometry and determined by the inverse adding doubling (IAD) method. Inclusion of CNTs in phantoms increased light absorption with …
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Oblique-incidence fiber-optic reflectometry for measuring absorption and scattering in turbid media
… method for measuring the absorption and reduced scattering coefficients, $\mu\sb{a}$ and $\mu\sb{s}\sp\prime ,$ of semi-infinite turbid media. Obliquely incident light produces a spatial distribution of diffuse reflectance that is not centered about the point of light entry. The shift in the …
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Inverse problems in electromagnetics
… of the reflection and the transmission coefficients. A robust method is proposed for the retrieval of metamaterials as isotropic media, and four improvements over the existing methods make the retrieval results more stable. Next, a new scheme is presented for the retrieval of a specific …
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Rain scatter interference in satellite links
Scattering by rain in addition to inducing attenuation and depolarization in satellite links can create intersystem interference. This type of interference was investigated extensively in the 1970's for terrestrial links, but little has been done to study its effects on modern and future satellite …
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Optical Techniques for Fruit Firmness Assessment
… optical properties (absorption and reduced scattering coefficients) and optical parameters respectively. The high-speed MSI system was designed to capture images of fruit using a high-resolution complementary metal–oxide–semiconductor camera, 12.5 mm lens, and discrete lasers operating at …
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Dual-polarization meteorological radar: theory and design
… canting angle. The formulation is in terms of scattering coefficients in a matrix, and can be applied to systems using linear, circular, or elliptical polarization. The general formulation reduces to results previously published in the literature for linear polarization differential …
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Wavelet Scattering Transforms Applied to Whale Vocalisations
… we investigate the application of wavelet scattering transforms to whale vocalisations. We first consider how wavelet transforms can provide an alternative time-frequency decomposition for use in signal detectors. Detectors typically utilise the short-time Fourier transform (STFT), for …
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A Radiative Model for the Study of the Feedback Mechanism between Photolytic Aerosols and Solar Radiation
… field in the atmosphere to absorption and scattering by aerosols. This effort is preliminary to the study of feedback mechanisms between photolytic processes that create and destroy aerosols and the radiation field itself. In this study, a cloud of water-soluble aerosols, randomly …
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Characterisation of Microphysical and Optical Properties of Atmospheric Aerosols in a High Arctic environment: Villum Research Station, NE Greenland
… in the 0.3 - 10 µm size range, particle scattering coefficients σsp, particle absorption coefficients σap, and Ångström exponents describing the wavelength dependence of both optical coefficients. The seasonal variability and distribution of these properties was analysed, and case studies …
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Joint identification in structural waveguides using wave reflection and transmission coefficients
… to investigate the reflection and transmission coefficients of various joint models in structural waveguides. The reflection and transmission coefficients are potentially more sensitive to the parameters of the joint models. Numerical simulations and experiments have been performed on three …
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