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 10 of 10 for “"Fourier transformations"”.
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Doppler ultrasound technique used to determine the blood flow viscosity in the middle cerebral artery of a canine animal model
… matched those in the published literature. Fast Fourier Transformations were used to write programs in MATLAB which served as the tool for data analysis.
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Rheologische und morphologische Charakterisierung von DBS-Netzwerkstrukturen in unterschiedlichen Polymermatrizes
… werden konnte. <br>Des Weiteren wurde die Fourier-Transformations (FT)-Rheologie implementiert und auf die DBS-Netzwerkstrukturen angewendet. Die kritischen Deformationsgrenzen, welche durch die 'klassischen' rheologischen Methoden bestimmt wurden, konnten durch die FT-Rheologie bestätigt …
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Automatic detection of periodic sources in the K2 data sets
… sources in the K2 data sets. Fast discreet Fourier transformations are used to compute the Fourier spectra of the targets and two different detection algorithms for identifying significant signals are used. The first technique searches through the DFT to identify peaks that are significantly …
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Nanostructured diamond-like carbon by dual pulsed laser ablation-pulsed gas feeding
… oxygen and hydrogen have been investigated by Fourier transformations Infrared Absorption, Rutherford backscattering, Elastic Recoil Detector. The optical and the surface topography of the films have been studied by Ultraviolet Visible spectrophotometer, Zygo interferometer, and Stylus …
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Algorithm for computation of the acoustic plane-wave reflection coefficient of the ocean bottom
… through a two-dimensional spatial-wavenumber Fourier transform. An algorithm is proposed to evaluate the plane-wave reflection coefficient from the bottom reflected field as a function of angle of incidencè. The algorithm is based on the "Projection-Slice" theorem associated with the …
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Frequency Analysis and Sheared Filtering for Multidimensional Effects in Rendering
… the sparse structure of these signals in the Fourier domain. We then leverage this information to design a sheared filter that is customized to each pixel's frequency content. We finally present practical algorithms that share samples between pixels, reduce sampling requirements by an order of …
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Transform-based quantum potential reconstruction from sparse spectral data: generalized Bertlmann-Martin moment inequalities
… inverted numerically to recover rho(r). In the Fourier/form-factor route, even moments determine F(q) and inverse transformation yields rho(r). To support sparse spectral inputs, analytic continuation is performed with Pade approximants, and the framework is organized into staged, reproducible …
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Advanced techniques for digital image processing
… The enhancement algorithm is a locally adaptive Fourier filter which locates and analyzes the Fourier spectral information and then enhances the identifying features. Thus, it can achieve a better enhancement result than conventional homomorphic FFT techniques. By using a short space basis …
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Multiple and Extended References in Fourier Transform Holography
Die Fourier Transformations Holographie (FTH) im Bereich der weichen Röntgenstrahlung hat sich vor allem durch die Einführung Freier Elektronenlaser (FEL) zu einem schnell wachsenden Forschungsgebiet entwickelt. In der klassischen FTH mit einem einzelnen Punktloch als Referenz sind Untersuchungen …