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 48 for “"Inverse Model"”.
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Application of an inverse model in the community modeling effort results
Inverse modeling activities in oceanography have recently been intensified, aided by the oncoming observational data stream of WOCE and the advance of computer power. However, interpretations of inverse model results from climatological hydrographic data are far from simple. This thesis examines …
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Application of an inverse model in the community modeling effort results
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Inverse model systems to investigate metal-support interactions in Fischer-Tropsch catalysis
… interaction in Co/SiO2 catalysts using an inverse model system by modifying Co3O4 nanocrystallites with silanes (i.e. tetraethoxysilane, trimethyl chlorosilane, triphenyl ethoxysilane). It is postulated that the formation of Co-O-Si will alter the catalytic properties of the cobalt site to …
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Sensitivity of a general circulation inverse model to sub-grid scale parametrization coefficients
Ocean modellers seek to understand the circulation of the oceans, or portions thereof, by developing models of the ocean they can solve. This tractability constraint forces ocean modellers to make choices. Naturally, they hope to make intelligent choices, but whenever a new model is being developed …
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Evaluating least absolute deviation regression as an inverse model in groundwater flow calibration
The automated inverse procedure built into the US Geological Survey MODFLOW groundwater model works well with single layer geologic systems; however, it does not work well with multi-layer systems. This dissertation provides the Least sum Absolute Deviation regression and Expectation Maximization …
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Sensitivity of a general circulation inverse model to sub-grid scale parametrization coefficients
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The estimation and statistical inferences of the position and orientation of a scanning laser Doppler vibrometer
In this dissertation, two nonlinear regressive models, the forward model and the inverse model, have been developed to determine the pose (position and orientation) of the scanning laser Doppler vibrometer (SLDV) with respect to a structural coordinate system. The parameters in the forward model …
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Forward and Inverse Modeling of Tsunami Sediment Transport
… both tsunami frequency and magnitude. Numerical modeling of sediment transport during a tsunami is important interdisciplinary research to estimate the frequency and magnitude of past events and quantitative prediction of future events. The goal of this dissertation is to develop robust, …
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Advances in iterative learning control with application to structural dynamic response reconstruction
… cases is traditionally an approximate, linear inverse model of the closed-loop test system. This research presents advances in ILC, particularly with respect to its application in response reconstruction for fatigue testing purposes. The contribution of this research focuses on three aspects: …
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A nonlinear least squares inversion to the single-scattering three-dimensional radiative transfer equation for satellite-based tomography
A major uncertainty in weather and climate models lies in the effect of clouds and aerosols. The IPCC's Fifth Assessment Report states that while models include more cloud and aerosol processes, there is still low confidence in the representation and quantification of the processes in climate …
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Diapycnal advection by double diffusion and turbulence in the ocean
… thermal and energy dissipation rates. While the model for turbulence describes most dissipation occurring in high shear, dissipation in low shear is better described by the salt-finger model, and a method for estimating the salt-finger enhancement of the diapycnal haline diffusivity over the …
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Diapycnal advection by double diffusion and turbulence in the ocean
… thermal and energy dissipation rates. While the model for turbulence describes most dissipation occurring in high shear, dissipation in low shear is better described by the salt-finger model, and a method for estimating the salt-finger enhancement of the diapycnal haline diffusivity over the …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
… of the oceanic circulation. Using a dynamical inverse model of the North Atlantic and a kinematic inverse model of the South Atlantic, it is shown that a tracer distribution corresponding to a significantly reduced volume of Lower NADW does not necessarily correspond to a reduced flux of NADW. …
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Self-organising locally interpolating maps in control engineering
… accurate. A data-based learning controller model is implemented with the Self-Organising Locally Interpolating Map (SOLIM). SOLIM includes a new method that continuously and interpretably maps from a grid of input support vectors, e.g. a robot's velocity, to a grid of output support vectors, …
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Neural Model-Based Advanced Control of Chylla-Haase Reactor
… start with the development of mathematical model of the process. The sub-models for monomer concentration, polymerization rate, reactor temperature and jacket outlet/inlet temperature are developed and implemented in Matlab/Simulink. Four conventional control methods were applied to the …
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Development and Demonstration of Surrogate Models to Predict Energy-Related Building Features from Heating and Cooling Load Signature
… auditing methodologies, including advanced inverse-based methods, often face constraints in terms of engineering cost, time, high fidelity operational data availability, and scalability. Utilizing inverse model-based machine learning, surrogate models for 12 mid to high-rise buildings were …
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Alumina-modified cobalt catalysts for the Fischer-Tropsch synthesis
… support porosity. This is achieved by preparing inverse-model catalysts, in which the support is deposited onto the metal, in contrast to conventional supported catalysts, in which the metal phase is deposited onto a porous support [2]. Cobalt alumina inverse-model catalysts were prepared by …
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Inverse dynamic modeling for characterization of spasticity
… interventions for this disabling phenomenon. An inverse model is implemented to describe the motion in the pendulum knee drop test. Inverse kinematic modeling is implemented to investigate the pathophysiology of spasticity. Using the equilibrium point hypothesis as a conceptual framework to …
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Advances in Hierarchical Probabilistic Multimodal Data Fusion
… (LDF). LDF addresses the case where the forward model for a subset of the data sources is unknown or poorly characterized. LDF leverages the remaining data sources to learn an inverse model suitable for posterior inference that combines both types of data. Additionally, we develop a multimodal …
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Circulations and water mass balances in the Brazil Basin
… volume anomaly along isopycnal surfaces, the inverse model proposed by Hogg (1987) is modified for increasing accuracy and applied to the Brazil Basin to study the circulation, diffusion and water mass balances. The equations in the model, i.e. the dynamic equation, continuity equation, …
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