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 224 for “"Wavenumber"”.
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Wavenumber filtering by mechanical structures
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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Directional wavenumber characteristics of short sea waves
… two-dimensional spectral width as a function of wavenumber. Two current spectral models support this to some extent, while other models do not. The data also shows a similar azimuthal width for the scatterometer return and the width of the short wavelength portion of the wave height spectrum …
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Directional wavenumber characteristics of short sea waves
Thesis (Ph. D.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Ocean Engineering; and the Woods Hole Oceanographic Institution), 2000.
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Two-probe techniques to measure wavenumber-frequency spectrum of VTF plasma
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Geoacoustic inversion in laterally varying shallow-water environments using high-resolution wavenumber estimation
… input data to the inversion is the horizontal wavenumber spectrum of a point-source acoustic field. The main thrust of the thesis work concerns extracting horizontal wavenumber content for fully three-dimensionally varying waveguide environments. In this context, a high-resolution …
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Geoacoustic inversion in laterally varying shallow-water experiments using high-resolution wavenumber estimation
… input data to the inversion is the horizontal wavenumber spectrum of a point-source acoustic field. The main thrust of the thesis work concerns extracting horizontal wavenumber content for fully three-dimensionally varying waveguide environments. In this context, a high-resolution …
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Hybrid Galerkin boundary element-wavenumber integration method for acoustic propagation in laterally inhomogeneous media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1991.
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Investigation into a non-contacting direct measurement of wavenumber distribution for a vibrating surface
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.
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The role of wavenumber one and two in the development of sudden stratospheric warmings
… to demonstrate that the tropopause affects wavenumber one amplitudes more than wavenumber two. Thus, the statistical predictability of SSWs, based on synoptic events in the mid-troposphere (e.g. blockings), is limited. Composites of extreme heat fluxes reveal that they are likely caused by …
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Characterization of II-VI semiconductor nanostructures by low wavenumber raman- and four-wave-mixing spectroscopy
Es ist bekannt, dass räumlich eingeschränkte Ladungsträger in niederdimensionalen Halbleitern zur Verstärkung optischer und elektronischer Eigenschaften solcher Nanostrukturen beitragen. Die Physik des "Quantum Confinements" ist trotz umfangreicher Nachforschungen noch immer nicht völlig …
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Comparison of techniques to measure the low wavenumber wall pressure spectrum of a turbulent boundary layer
Thesis: Mech. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1984
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Space and time scales of low frequency variability in the ocean
… low frequency variability energy in horizontal wavenumber, frequency, vertical mode and geography. We assume horizontal isotropy, Φ(K, ω, η, φ, λ) = 2πKψ(k, l, ω, η, φ, λ), with K designating the amplitude of total horizontal wavenumber. The parameters of Φ(K, ω, η, φ, λ) can be derived from …
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Analysis for Taylor vortex flow
… stability. In contrast with the wide region of wavenumber predicted by the linear theory, experiments show that Taylor vortex flow only appears in a small region containing the critical wavenumber ß<sub>er</sub> This phenomenon is called wave selection. In this work, several high-order …
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Vertically Propagating Tides in the Martian Atmosphere
… densities revealed large-amplitude large-scale wavenumber-2 signature attributed to a class of tides known as nonmigrating tides. Recent observations from the Mars Atmosphere and Volatile Evolution mission (MAVEN) suggest that tides producing wavenumber-2 and wavenumber-3 structures are …
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Spectral description of low frequency oceanic variability
… flux. Analytic formulas for the frequency and wavenumber spectra of any physical variable, and for the cross spectra between any two different variables for each vertical mode of the simple dynamic model are derived. No heat transport exists in the model. No momentum flux exists either if the …
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An analytic model of the Cochlea and functional interpretations
… as well as the behavior of recent data-derived wavenumber estimates. We provide closed-form expressions for macromechanical responses - the pressure difference across the Organ of Corti (OoC), and the OoC velocity, as well as the response characteristics - such as bandwidth and group delay. We …
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Development of an intracoronary Raman spectroscopy
… shifts between 400 and 1800 cm-1), the high wavenumber region (2700 - 3100 cm-1) offers distinct technical advantages, including increased Raman signal relative to the fluorescent background and potentially less fiber background. However, the high wavenumber region may yield different …
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Observations and modelling of deep equatorial currents in the central Pacific
… energy meridional structure at this vertical wavenumber band, seem consistent, within experimental errors, with the presence of a first meridional mode long Rossby wave packet, weakly modulated in the zonal direction. The equatorial deep jets, identified with the peak centered at 350 sm, are …
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Spectral description of low frequency oceanic variability
… flux. Analytic formulas for the frequency and wavenumber spectra of any physical variable, and for the cross spectra between any two different variables for each vertical mode of the simple dynamic model are derived. No heat transport exists in the model. No momentum flux exists either if the …
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Design of Active Structure Acoustic Control Systems Using Eigenassignment Approach
… non-volumetric design and the minimum supersonic wavenumber design, were developed for designing efficient ASAC system. The eigenassignment method for feedforward control system serves as the fundamental design tool for both formulations. In this study, the dynamic characteristics of a …
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