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 1507 for “"Inversion"”.
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Inversion
The novel Inversion is a study in human molting and the collapse of diachronic time within advanced, global, informatized capitalism. It is set in Montana.
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Inversion
The novel Inversion is a study in human molting and the collapse of diachronic time within advanced, global, informatized capitalism. It is set in Montana.
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Borehold resistivity inversion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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Quantitative Stratigraphic Inversion
We develop a methodology for systematic inversion of quantitative stratigraphic models. Quantitative stratigraphic modeling predicts stratigraphy using numerical simulations of geologic processes. Stratigraphic inversion methodically searches the parameter space in order to detect models which best …
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THE INVERSION LAYER: ESSAYS
… Things” is an active mall, the site in “The Inversion Layer” is a tourist destination, and the site in “A Beautiful Piece of Nowhere” has no official memorial. All of these essays incorporate research but are grounded mostly in the author’s experiences at his visits to these places. The …
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Parametric Inversion of Programs
… inputs that produce an output. Parametric inversion takes a new approach to solving inverse problems by proposing a method to make a non-injective (many-to-one) function invertible through a parameter. This parameter is used to distinguish between elements in the input space of a function …
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Score Distillation via DDIM Inversion
While 2D diffusion models generate realistic, high-detail images, 3D shape generation methods like Score Distillation Sampling (SDS) built on these 2D diffusion models produce cartoon-like, over-smoothed shapes. To help explain this discrepancy, in this paper we prove that the image guidance used …
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Viscoelastic full-waveform inversion: treating attenuation uncertainty, characterizing cross-talk, and quantifying confidence in inversion results
Full waveform inversion (FWI) is a powerful technique for estimating the subsurface properties which affect seismic wave propagation but it is often limited by simplistic treatment of wave propagation physics. In particular, attenuation and dispersion, which play major roles in most seismic …
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Geoacoustic inversion by mode amplitude perturbation
… can be used to obtain the input data for the inversion algorithm from pressure measurements made on a vertical line array (VLA). The estimator is an Extended Kalman Filter (EKF), which treats the mode amplitudes and eigenvalues as state variables. Numerous synthetic and real-data examples of …
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Reservoir characterization using intelligent seismic inversion
… description through a process called seismic inversion.;In this study, an intelligent seismic inversion methodology is presented to achieve a desirable correlation between relatively low-frequency seismic signals, and the much higher frequency wireline-log data. Vertical seismic profile (VSP) …
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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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Reservoir characterization using seismic inversion data
… and density of different data. Because seismic inversion, conceptual stacking, and lateral variability of the facies are uncertain, stochastic ensembles of geomodels are needed to capture variability. <p>In this research, geomodels integrate stochastic seismic inversions. At each trace, …
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Fourier Inversion Formulas of Orbital Integrals
Made available in DSpace on 2014-12-14T13:09:31Z (GMT). No. of bitstreams: 1 7708928.pdf: 2084430 bytes, checksum: 6d6d50df8f6ed57770558805318d280b (MD5) Previous issue date: 1976
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Bayesian source inversion of microseismic events
… motions from such waves are used in source inversion to characterise the dynamic behaviour of the source and to help in understanding the driving processes. Earthquakes either occur naturally, such as in volcanic eruptions and natural geothermal fields, or are linked to anthropogenic …
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Geoacoustic inversion by mode amplitude perturbation
… can be used to obtain the input data for the inversion algorithm from pressure measurements made on a vertical line array (VLA). The estimator is an Extended Kalman Filter (EKF), which treats the mode amplitudes and eigenvalues as state variables. Numerous synthetic and real-data examples of …
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Three-dimensional magnetotelluric modelling and inversion
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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Generalized inversion and theory of agree
… some of the fundamental questions surrounding inversion structures. I first provide an analysis of Locative Inversion. I show that the mixed A- and A- syntactic behavior of the fronted PP in English could be derived once we understand how the featural composition of locative phrases influences …
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Airplane trajectory expansion for dynamics inversion
In aircraft research, there is keen interest in the procedure of determining the set of controls required to perform a maneuver from a definition of the trajectory. This is called the inverse problem. It has been proposed that if a complete set of states and state time derivatives can be derived …
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Randomization for Efficient Nonlinear Parametric Inversion
… degrading the accuracy of the solution to the inversion problem. We demonstrate the efficiency of these approaches with 2-dimensional and 3-dimensional examples from DOT; however, our methods have the potential to be useful for other applications as well.
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