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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 40 of 8642 (0.023 seconds)Spelling suggestions: "subject:"index."" "subject:"índex.""
| 31 |
Modelling Standard and Poors 100 index volatilityBlair, Bevan John January 2000 (has links)
No description available.
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| 32 |
The Maslov index in Hamiltonian dynamical systemsFoxman, Jerome Adam January 2000 (has links)
No description available.
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| 33 |
Dual Interferometer System for Measuring Index of RefractionGoodwin, Eric Peter January 2007 (has links)
The optical power of a lens is determined by the surface curvature and the refractive index, n. Knowledge of the index is required for accurate lens design models and for examining material variations from sample to sample. The refractive index of glass can be accurately measured using a prism spectrometer, but measuring the index of soft contact lens materials presents many challenges. These materials are non-rigid, thin, and must remain hydrated in a saline solution during testing. Clearly an alternative to a prism spectrometer must be used to accurately measure index.A Dual Interferometer System has been designed, built and characterized as a novel method for measuring the refractive index of transparent optical materials, including soft contact lens materials. The first interferometer is a Low Coherence Interferometer in a Twyman-Green configuration with a scanning reference mirror. The contact lens material sample is placed in a measurement cuvette, where it remains hydrated. By measuring the locations of the multiple optical interfaces, the physical thickness t of the material is measured. A new algorithm has been developed for processing the low coherence signals obtained from the reflection at each optical interface.The second interferometer is a Mach-Zehnder interferometer with a tunable HeNe laser light source. This interferometer measures the optical path length (OPL) of the test sample in the cuvette in transmission as a function of five wavelengths in the visible spectrum. This is done using phase-shifting interferometry. Multiple thickness regions are used to solve 2π phase ambiguities in the OPL.The outputs of the two interferometers are combined to determine the refractive index as a function of wavelength: n(λ) = OPL(λ)/t. Since both t and OPL are measured using a detector array, n is measured at hundreds of thousands of data points. A measurement accuracy of 0.0001 in refractive index is achieved with this new instrument, which is verified using custom glass calibration samples.
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| 34 |
Relationship among return, volume and volatility : an empirical study of the Hong Kong stock marketMak, Sui Choi Billy January 2000 (has links)
No description available.
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| 35 |
The precise determination of refractometric parameters for atmospheric gasesBirch, K. P. January 1988 (has links)
No description available.
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| 36 |
Global vegetation monitoring using ERS-1 scatterometer dataMesseh, Maged Farouk Zaky Abdel January 1998 (has links)
No description available.
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| 37 |
Conventional and indexed UK bond returns and the macroeconomy : an empirical analysis based on asset pricing and reduced form VAR modelsReschreiter, Andreas January 2001 (has links)
No description available.
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| 38 |
Changes in the diets of adolescentsFletcher, Emma S. January 2003 (has links)
No description available.
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| 39 |
Agricultural non-point source nitrate pollution control by land use optimisationKoo, Bhon Kyoung January 2002 (has links)
No description available.
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| 40 |
Wave propagation and grating formation in photorefractive materialsAu, L. B. January 1988 (has links)
No description available.
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