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 9 of 9 for “"Inverse Theory"”.
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An Inverse Theory Approach to Incoherent Scatter Drift and Temperature Estimation at the Jicamarca Radio Observatory
… predictions, we extended incoherent scatter theory to the realm of coherences. A very careful comparison between theoretical and measured spectra and theoretical and measured coherences has clearly established that the measured spectra and coherences are much narrower than those predicted by …
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Algorithms for Reconstruction of hidden 3D shapes using diffused reflections
… We also aim at formulating the forward and inverse theory of secondary and tertiary diffuse scattering using ideas from tomography. We aim at developing tomography based approaches and sparsity based methods to recover 3D shapes of objects "around the corner". We analyze multi-bounce …
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Two-dimensional separate-sided surface height profiling of lumber
… through a mathematical technique based on linear inverse theory. Subtracting relative motion information from raw line scanner data provides an accurate 2-D surface profile. A second line scanner placed below the board can be used to obtain a separate 2-D profile of the bottom lumber surface. …
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Extracting Ramachandran torsional angle distributions from 2D NMR data using Tikhonov regularization /
… g{^,'4)), are strongly model-dependent. Inverse theory methods are used to extract Ramachandran angle distributions from a set of 2D MAS and constant-time double-quantum-filtered dipolar recoupling (CTDQFD) data. This is a vastly underdetermined problem, and the stability of the inverse …
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Transform-based quantum potential reconstruction from sparse spectral data: generalized Bertlmann-Martin moment inequalities
Inverse quantum problems ask whether a central potential V(r) can be reconstructed from limited spectral information under explicit modeling assumptions. This dissertation develops and validates a reproducible, transform-based framework for reconstructing ground-state radial densities rho(r) = …
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Theoretical and computational studies in seismic tomography
… to the study and solution of seismic tomography inverse problems. In particular, we set out the mathematical grounding for novel inversion frameworks which could be applied to waveform inversion. In Chapter 2, we introduce an inversion framework for determining the topography of internal …
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1D shallow sedimentary subsurface imaging using ambient noise and active seismic data
… observed microtremors H/V spectral ratio. The theory is further extended in this research work to include not only the interpretation of the H/V measured at the surface, but also the H/V measured at depths and in marine environments. A modeling and inversion of synthetic H/V spectral ratio …
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Detection and Kirchhoff-type migration of seismic events by use of a new characteristic function
The classical method of seismic event localization is based on the picking of body wave arrivals, ray tracing and inversion of travel time data. Travel time picks with small uncertainties are required to produce reliable and accurate results with this kind of source localization. Hence recordings, …