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 8 of 8 for “"nonlinear inversion"”.
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Magnetic resonance elastography and nonlinear inversion problem in the aging brain
… MR imaging and finite element based nonlinear inversion (NLI) for estimation of viscoelastic material properties have shown NLI-MRE's impressive ability to capture subtle correlations between memory performance and stiffness in grey matter regions. These discoveries are made possible …
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Output feedback rotational maneuvers and vibration damping of Nasa Scole system by inversion theory
… and vibration suppression of the SCOLE System. Nonlinear inversion theory is used for the design. The design approach taken here is to decompose the rigid mode control from vibration stabilization. (Abstract shortened with permission of author.).
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Imaging of the Hellenic subduction zone by seismic tomography
… transitions in subducted material at depth. Nonlinear inversion of P-wave travel times was used on a global dataset expanded by temporary array data collected in southern Greece. Results show a vertically continuous slab, with a break at the depth 200-400 km detected only in the NW portion of …
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Decoupling and adaptive control and stabilization of two-link elastic robotic arm
… arm is considered. The first scheme is based on nonlinear inversion, a nonlinear controller is designed for the trajectory control of the joint angles using joint torquers. The inverse controller includes a servocompensator for robustness. A simplified controller has also been designed neglecting …
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Variable structure and singular perturbation control of elastic dynamical systems
… perturbation technique is used. Based on nonlinear inversion, a control law is derived to decouple the attitude angle and the dominant flexible modes from the remaining elastic modes. The inverse control law decomposes the spacecraft dynamics into a slow and a fast subsystem. Based on …
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Microwave remote sensing of young sea ice in the Greenland Sea
… are presented from using ice spectra in a nonlinear inversion algorithm, previously used for ocean spectra. A quasi-linear model is then used to indicate that the ice cover extends the azimuthal cut-off to higher wavenumbers and this alone can alter the detected peaks in the SAR spectra. …
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Advanced analysis of complex seismic waveforms to characterize the subsurface Earth structure
… in urban areas, and (3) Surface wave dispersion inversion for shear wave velocity structure. Although these three projects apply different techniques and investigate different parts of the Earth, their aims are the same, which is to better understand and characterize the subsurface Earth …