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 “"forward modeling"”.
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Forward modeling of tree-climate relations across the Northern Hemisphere
This thesis uses the Vaganov-Shashkin model of tree ring formation, a multivariate, nonlinear, mechanistic model that directly predicts tree-ring growth using climate data, to simulate tree-ring formation across the Northern Hemisphere. Previous research has shown the model has skill in reproducing …
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Forward modeling the gravitational field using a direct solution of Poisson's equation
Forward modeling of gravity data typically computes the vertical gravitational acceleration using either closed-form formulae, or numerical solution of Poisson's equation governing the gravity potential followed by numerical differentiation. We present a method for computing the vertical gravity …
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Offset vertical seismic profiling : two-dimensional forward modeling with asymptotic ray theory
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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A discrete forward-modeling method for characterizing occultation lightcurves of tenuous planetary atmospheres
We present a discrete numerical approach for forward-modeling lightcurves from stellar occultations by planetary atmospheres. Our discrete approach provides a way to arbitrarily set atmospheric properties at any radius from the occulting body, giving it flexibility for applying models of vertical …
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Array processing and forward modeling methods for the analysis of stiffened, fluid-loaded cylindrical shells
This thesis investigates array processing and forward modeling methods for the analysis of experimental, structural acoustic data to understand wave propagation on fluid-loaded, elastic, cylindrical shells in the mid-frequency range, 2 < ka < 12. The transient, acoustic, in-plane, bistatic …
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Array processing and forward modeling methods for the analysis of stiffened, fluid-loaded cylindrical shells
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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Forward modeling of deepwater outcrop geobodies to enhance seismic interpretation of Ursa field, Gulf of Mexico
Includes bibliographical references (pages 126-137).
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Forward Modeling for Bolometry and Disruption Mitigation in Tokamaks or How to Kill Your Plasma With Confidence, Style, and Pizzazz
The tokamak is a promising approach to magnetic confinement fusion. Tokamak functionality is threatened by plasma disruption events, which can damage critical machine components. Disruption damage can be mitigated by high-Z impurities, delivered by Massive Gas Injection (MGI) or Shattered Pellet …
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Signal processing and image restoration techniques for two-dimensional eddy current nondestructive evaluation
… presents a comprehensive study on the forward modeling methods, signal processing techniques, and image restoration techniques for two-dimensional eddy current nondestructive evaluation. The basic physical forward method adopted in this study is the volume integral method. We have …
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Effects of anisotropic magnetic susceptibility in data interpretation and its potential in application
… AMS within the user-defined coordinate system. Forward modeling of magnetic response over a synthetic AMS model shows that even at low susceptibility values, the induced magnetization direction can be rotated significantly away from the inducing field direction. A series of numerical experiments …
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Usability Engineering Applied to an Electromagnetic Modeling Tool
… the steps users take to work through the 2D forward-modeling problem, and to analyze usability errors encountered while working with the interface to gain a better understanding of how to build a more effective interface. Similar work has been conducted on interface design in other fields, …
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Imaging and interpreting seismic heterogeneity in the North American lithosphere
… In this Thesis I jointly interpret inverse modeling of seismic data and forward modeling of chemical and thermodynamic data in order to investigate the origins of seismic heterogeneity within the cratonic lithosphere. I present a joint inversion of body and surface wave travel-times to …
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Examining the effects of mid ocean ridge topography on 3D marine magnetometric resistivity model responses
… on MMR models. To analyze these effects a 3D MMR forward modeling program MMR3D_fwd is used to model Mid Ocean Ridges with varying slopes, resistivities, and source/receiver geometries. The modeled magnetic fields are compared with models with a flat seafloor to determine the impact of the ridge …
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Examining the effects of mid ocean ridge topography on 3D marine magnetometric resistivity model responses
… on MMR models. To analyze these effects a 3D MMR forward modeling program MMR3Df̲wd is used to model Mid Ocean Ridges with varying slopes, resistivities, and source/receiver geometries. The modeled magnetic fields are compared with models with a flat seafloor to determine the impact of the ridge …
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Miocene core complex development and coeval supradetachment basin evolution of Paros, Greece
… of (U-Th)/He dating which can be corrected by forward modeling unique alpha-ejection corrections.
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Electrical and electromagnetic methods for submarine massive sulfide exploration: a case study of the Palinuro Seamount, Tyrrhenian Sea
… detected by the system. I also carried out 3D forward modeling which suggests that this configuration is sensitive to a shallowly buried conductive target of dimensions consistent with the drilling zone at a remote receiver up to ~100 m away from the transmitter when the target is located in …
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Extracting Polar Anisotropy Parameters from Seismic Data
… and density well logs, we can do isotropic AVO forward modeling, using isotropic Zoeppritz equations or its approximations, and a wavelet extracted from the seismic data, to get synthetic seismic data. Compared with real seismic data, these synthetic data are scaled differently, and ignore many …
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Advanced Methods for the Simulation of Radar Sounder Planetary Data
… scientific phase, they are essential for both forward modeling, validating geological hypotheses against synthetic data, and inverse modeling, where they support the retrieval of geophysical properties from complex observational data. Despite this pivotal role, the current landscape of …
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Numerical Modeling as a Means to Enhance Genetic Sedimentary Basin Interpretation : A Case Study of the Southern Cantabrian Basin (NW Spain)
… approach of reverse basin and stratigraphic forward modeling. The basin fill comprises Cambrian to Carboniferous deposits that were deformed and displaced along thrust planes by thin-skinned tectonics within the Variscan fold-and-thrust belt. In order to carry out stratigraphic modeling, …
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Application of the complex step method to chemistry-transport modeling
… analysis in atmospheric chemistry-transport modeling is used to develop understanding of the mechanisms by which emissions affect atmospheric chemistry and composition, to quantify the marginal impact of emissions on air quality, and for other applications including improving estimates of …
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