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 53 for “"inversion method"”.
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Three dimensional geodetic inversion method for stress modelling in the lithosphere
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1980.
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A modal/WKB inversion method for determining sound speed profiles in the ocean and ocean bottom
… acoustic modal eigenvalues are examined. Both methods use measured eigenvalues and mode dependent assumed values of the WKB phase integral as input data and use the WKB phase integral as a starting point for relating the index of refraction to depth. Inversion method one is restricted to …
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Kirchhoff Common Offset Migration Velocity Analysis via Differential Semblance
… reservoirs and indicate hydrocarbons. This method optimizes a differential measure of the image gather flatness by comparing the residual moveout between neighboring traces. It stands out as a more accurate and automated inversion method among a good number of existing approaches. In this …
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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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An inverse method for obtaining the attenuation profile and small variations in the sound speed and density profiles of the ocean bottom
… and density as a function of depth. An inverse method based on a perturbation technique is presented in this thesis for the determination of these parameters. A monochromatic source experiment is proposed because of the desirability of such an experiment for determining the acoustic properties …
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Modelling, Migration, and Inversion for Angle Domain Common Image Gathers
… the high accuracy requirements of migration and inversion algorithms. This thesis focuses on developing an new algorithm to integrate the modeling, migration, and inversion of ADCIGs. The modeling of ADCIGs is based on acoustic and elastic wave equations, and the results are compared with the …
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Ground motions and source mechanisms of earthquakes in multiscales : microseismicity to macroseismicity
… a waveform-based Bayesian moment tensor inversion approach was developed and validated by synthetic tests. The Bayesian approach estimates the source parameters and the uncertainties by generating a posterior probability density function of the source parameters. The effects of location, …
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Multiscale forward and inverse problems with the DGFD method and the deep learning method
… data and instructing large-scale field test and inversion. A deep learning based full wave inversion method has also been developed to reconstruct the underground anomaly.</p><p>Since the gas and oil industry has very high demands for the forward modeling speed when doing inversion, the inversion …
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Estimation of seismic parameters from multifold reflection seismic data by generalized linear inversion of Zoeppritz equations
An inversion method is developed to estimate the P- and S-wave velocities and density ratio of two elastic, isotropic, and homogeneous media separated by a plane, horizontal boundary from P-wave reflection amplitude-versus-offset (AVO) data recorded at the surface. The method has for its basis the …
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Scattering Techniques for the Geophysical Inverse Problem
… theory. We generalize certain inverse scattering methods in quantum mechanics to determine the properties of the stratification from experimental knowledge gathered at the origin of the half-line. We further apply this method with some mathematical manipulations to arrive at a procedure to solve …
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DEVELOPMENT OF FUNCTIONAL NANOPARTICLES AND COMPOSITE MEMBRANES FOR TREATING ARSENIC CONTAMINATED WATER
… FLAT SHEET MEMBRANES WERE SYNTHESIZED BY PHASE INVERSION METHOD. BOTH THE BATCH AND FILTRATION EXPERIMENT WERE CONDUCTED TO INVESTIGATE THE ARSENIC ADSORPTION BEHAVIOR OF THE MATERIALS. A SERIES OF CHARACTERIZATION STUDIES WERE CARRIED OUT TO FULLY UNDERSTAND THE MECHANISM OF THE REMOVAL PR
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Synthesis and characterization of pH/temperature dual sensitive multiblock copolymer for drug delivery
… three different techniques: rheometer, test tube inversion method, and falling ball method. The polymer shopH-triggered degradation and drug release with nile red and irinotecan. The ketal linker connecting Pluronic® was cleaved and resulted in smaller molecular weight strain causing change in …
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Two-dimensional constrained anisotropic inversion of magnetotelluric data
… which can be imaged by various geophysical methods. In order to achieve appropriate and realistic Earth models for interpretation, inversion algorithms have to allow for an anisotropic subsurface. Within the framework of this thesis, I analyzed a magnetotelluric (MT) data set taken from the …
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Understanding the Relationship between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems
… to the development of an empirical permeability inversion method. We demonstrate that seismicity density can be used as a proxy for pressure increase. The pressure distribution itself is a function of the hydrological properties evolution, permeability and porosity, with space and time in the …
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Applications of low-rank approximation: complex networks and inverse problems
… the aid of a regularized damped Gauss{Newton method. The inversion method is based on the low-rank approximation of the Jacobian of the function to be inverted.
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ESTIMATING PERFUSION AND VASCULAR PROPERTIES FROM MEDICAL IMAGES: QUANTITATIVE TRANSPORT MAPPING (QTM)
… fast and accurate tracer propagation simulation method based on underlying fluid mechanics, as well as an inversion method that can recover perfusion parameters from contrast enhanced medical images (Quantitative Transport Mapping, QTM). The tracer propagation simulation method provides a …
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Multi-Satellite Remote Sensing of Land-Atmosphere Interactions: Advanced Data-Driven Methodologies for Passive Microwave Retrievals of Flood and Precipitation
… presents a multi-satellite multi-sensor Bayesian methodology for prognostic detection of two key components in the terrestrial water cycle: (1) the extent of flooded regions at a sub-daily basis, which improves the flood forecasting by identifying the soil saturated zones, and (2) the …
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Advances in iterative learning control with application to structural dynamic response reconstruction
… research also presents advances in the stable inversion method that is used to invert such models. Keywords: Iterative learning control, response reconstruction, fatigue testing, NARX models, Kolmogorov- Gabor polynomials, system identification, stable inversion, nonlinear, discrete time, …
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The effect of flower-like tatania towards characteristics and performance of polysulfone mixed matrix membrane
… and PSf/ST membranes were prepared via phase inversion method at five different concentrations of additive. Membrane characterization involved several observations such as cross-section area, particle distribution, surface roughness, hydrophilicity property, mean pore size, mechanical strength …
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