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Mie Theory (mie + theory)

Distribution by Scientific Domains
Medical Sciences40%

Selected Abstracts

Dual-Function Scattering Layer of Submicrometer-Sized Mesoporous TiO2 Beads for High-Efficiency Dye-Sensitized Solar Cells

ADVANCED FUNCTIONAL MATERIALS, Issue 8 2010
Fuzhi Huang
Abstract Submicrometer-sized (830,±,40,nm) mesoporous TiO2 beads are used to form a scattering layer on top of a transparent, 6-µm-thick, nanocrystalline TiO2 film. According to the Mie theory, the large beads scatter light in the region of 600,800,nm. In addition, the mesoporous structure offers a high surface area, 89.1,m2 g,1, which allows high dye loading. The dual functions of light scattering and electrode participation make the mesoporous TiO2 beads superior candidates for the scattering layer in dye-sensitized solar cells. A high efficiency of 8.84% was achieved with the mesoporous beads as a scattering layer, compared with an efficiency of 7.87% for the electrode with the scattering layer of 400-nm TiO2 of similar thickness. [source]

Compressing infrared spectrum of exhaust plume by wavelets

HEAT TRANSFER - ASIAN RESEARCH (FORMERLY HEAT TRANSFER-JAPANESE RESEARCH), Issue 2 2010
Yanming Wang
Abstract A study on multivariate calibration for the infrared spectrum of rocket exhaust plume was presented. As samples taken in the data set, the apparent infrared radiative properties of the high-temperature plume flowfield consisted of variable concentrations gas components and were obtained by using a flux method combined with a narrow-band model and Mie theory. The discrete wavelet transformation as a pre-processing tool was carried out to decompose the infrared spectrum and compress the data set. The compressed data regression model was applied to simultaneous multi-component concentrations for determination of the exhaust plume. The compression performance with several wavelet functions at different resolution scales was studied, and the prediction reliability of the compressed regression model was investigated. Numerical experiment results show that the wavelet transform performs an effective compression preprocessing technique in multivariate calibration and enhances the ability in characteristic extraction of the exhaust plume infrared spectrum. Using the compressed data regression model, the reconstructing results are almost identical when compared to the original spectrum, and the original size of the data set has been reduced to about 5% while the computational time needed decreases significantly. © 2009 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/htj.20280 [source]

Diffraction imaging of spheres and melanoma cells with a microscope objective

JOURNAL OF BIOPHOTONICS, Issue 8-9 2009
Kenneth M. Jacobs
Abstract Diffraction imaging of polystyrene spheres and B16F10 mouse melanoma cells embedded in gel has been investigated with a microscope objective. The diffraction images acquired with the objective from a sphere have been shown to be comparable to the Mie theory based projection images of the scattered light if the objective is translated to defocused positions towards the sphere. Using a confocal imaging based method to reconstruct and analyze the 3D structure, we demonstrated that genetic modifications in these cells can induce morphological changes and the modified cells can be used as an experimental model for study of the correlation between 3D morphology features and diffraction image data. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Numerical studies of optical switching and optical bistability phenomena of nano- or meso-size spheres

JOURNAL OF MICROSCOPY, Issue 3 2003
T. Okamoto
Summary We propose the use of numerical calculations of the optical response of nonlinear Kerr-spheres, modifying the Mie theory. As a numerical example, we use a CuCl sphere coated with a Kerr-nonlinear sphere, taking into account the excitation of the Z3 -exciton. The results clearly show that optical bistable and/or optical switching devices can be realized on a nano- and meso-size scale when the real part of the dielectric constant of CuCl is negative. [source]

Optical Levitation of Single Microdroplets at Temperatures Down to 180 K

CHEMPHYSCHEM, Issue 6 2003
C. Mund
A little light levitation: Optically transparent microdroplets can be levitated by means of the photon pressure exerted by a slightly focussed laser beam. The picture shows the forces operating on a particle during this process. The operation of this levitation techniques is reviewed on the basis of generalized Lorenz,Mie theory. The behaviour of levitated microparticles with respect to changes in composition and size can be investigated by Raman and Mie scattering. The feasibility of this technique for levitation studies down to 180 K is demonstrated. [source]