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 29 for “"inversion techniques"”.
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Advanced modeling and inversion techniques for three-dimensional geoelectrical surveys
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.
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Micro air vehicle control design : a comparison of classical and dynamic inversion techniques
… for a rotorcraft MAV using classical and dynamic inversion approaches. Classical control algorithms were developed based on linear, single input/single output analysis and were successfully implemented in hover, climb, and forward flight simulations. A dynamic inversion routine was then applied to …
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Inversion techniques for analyzing long pulse incoherent scatter radar data with a focus on F-region ion drift estimation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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USING AVO ANALYSIS TO DETERMINE THE GAS RESERVOIRS IN THE SOUTH THRACE BASIN, NORTHWEST TURKEY
… and real data. Conventional AVO analysis techniques were applied; however, the effects of the hydrocarbon saturation to the amplitude could not be highlighted in the reservoir zone. Therefore, three different inversion techniques were performed to obtain an accurate reservoir signature. …
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Acoustic classification of zooplankton
… feature based and model based classification techniques to invert broadband acoustic echoes from individual zooplankton for scatterer type, as well as for particular parameters such as animal orientation. The feature based Empirical Orthogonal Function Classifier (EOFC) discriminates scatterer …
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On the feasibility and application of optical p to n inversion
The feasibility of achieving carrier inversion of a properly doped crystal via optical excitation is studied. This process involves a host substrate doped with deep donors for n-type light characteristic and compensated by a shallow acceptor for p-type characteristic in the dark. This substrate is …
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Optimization for source localization and geoacoustic inversion in underwater acoustics
Matched-field inversion techniques are widely used for source localization and geoacoustic parameter estimation. These inversion methods correlate the received data with modeled data and find the model parameters which provide the maximum correlation. However, when a large number of unknown …
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DESCRIPTION OF THE BAKKEN FORMATION’S ROCK PROPERTIES OF THE WILLISTON BASIN, NORTH DAKOTA
… determine rock properties by utilizing seismic inversion techniques. The inversion technique is the most frequently used, by which the seismic interpreters derive lithology and physical properties. In this study, the 2D pre-stack seismic data was obtained from the analysis of Ross Field of the …
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Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
… relationship that is exploited during the inversion process. This thesis first describes the numerical implementation of the complete collisional ISR spectral model using chirp-z algorithm, and mainly focuses on Arecibo coded long pulse (CLP) data analysis, including spectrum generation and …
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Efficient inversion methods in underwater acoustics
… sound propagation in the ocean. The proposed inversion techniques are based on the linearization of the generally non-linear inverse problem of parameter estimation in underwater acoustics. These techniques take into account properties of the ocean environment and are accurate in their …
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Non-destructive evaluation of laboratory scale hydraulic fracturing using acoustic emission
… primary objective of this research is to develop techniques to characterize hydraulic fractures and fracturing processes using acoustic emission monitoring based on laboratory scale hydraulic fracturing experiments. Individual microcrack AE source characterization is performed to understand the …
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Characterizing methane emissions on oil and gas sites
… scale. This thesis introduces a number of inversion techniques that use methane concentration measurements from point sensor networks to infer emission characteristics on oil and gas sites. We first introduce an inversion method for inferring single-source emission characteristics, such as …
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Time-Lapse Variations of Multi-Component Electrical Resistivity Measurements Acquired in High-Angle Wells
… of multi-component measurements. Consequently, inversion techniques should not be used blindly to synthesize all the measurements in the estimation of anisotropic electrical conductivity. It is imperative that 3D effects be diagnosed and separated in the analysis prior to estimating electrical …
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2-D radio imaging of equatorial ionospheric plasma depletions with the C/NOFS satellite: algorithms and results
… ground instruments, together with tomographic inversion techniques, to obtain multi-dimensional images of the ionospheric electron density. However, the inverse problem has some noted challenges due to inherent constraints on the acquisition geometry. One such system is based on coherent VHF …
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Effects of lateral heterogeneity on 1D D.C. resistivity and transient electromagnetic soundings in Kuwait
… fixed-thickness and variable-thickness layer inversion techniques in succession. The optimal model has 6 layers above the half-space depth of 101 m, consisting of 3 surface layers down to 15 m depth and 3 intermediate layers, which correspond to the formations of the Kuwait Group overlying the …
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Development of GPR data analysis algorithms for predicting thin asphalt concrete overlay thickness and density
… of this study is to develop signal processing techniques to increase the resolution of GPR signals, such that they can be applied to thin AC overlay evaluation. First, the generic GPR forward 2-D imaging scheme is discussed. Then two linear inversion techniques are proposed, including migration …
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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 by the …
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Breast Cancer Risk in Women with Breast Bilateral Asymmetry: Machine Learning Based Risk Analysis and Mitigation through Developing a Framework for Customized Bra Design
… then developed two complementary computational inversion techniques to determine the individual-specific hyperelastic parameters of breast tissue, along with the breast's undeformed shape, using MRI images. This synergistic algorithm addresses issues with preloading-induced errors, thereby …
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Ocean color modeling: Parameterization and interpretation
… chapter three, three distinct inversion techniques, namely, nonlinear optimization (NLO), principal component analysis (PCA) and artificial neural network (ANN) are compared to assess their inversion performances to retrieve optically-active constituents for a complex nonlinear …
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