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 146 for “"parametrization"”.
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Improving groundwater flow model parametrization techniques
… this study is to improve hydrogeological model parametrization, with the focus on hydrogeological properties governing groundwater system response to transient forcing. It highlights multiple ways of estimating specific storage, which allows to provide better constraints for the calibration …
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Parametrization-independent elliptic surface grid generation
The generation of computational grids on surfaces of three-dimensional configurations is an important component of many areas of computational research, both as a boundary grid for volume grid generation or to perform computations on the surface. For reasons of computational efficiency, structured …
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Adaptive neural controller based on convex parametrization
The problem of control of a class of nonlinear plants has been addressed by using neural networks together with sliding mode control to lead to global boundedness. We revisit this problem in this thesis and suggest a specific class of neural networks that employ convex activation functions. By …
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Parametrization of Triple Screw Pumps for Aerospace Applications
<p>Triple Screw Pumps, a form of positive displacement pump, offer steady, high-pressure flow. In very small launch vehicles or upper stages turbopumps are not practical. This paper examines the performance of triple screw pumps to determine if they may serve as an alternative to turbopumps for use …
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Articulated pose estimation via over-parametrization and noise projection
… as the robot moves along a suitable path. Over-parametrization of poses avoids degeneracies and the corresponding Lie algebra enables noise projection to and from the over-parametrized space. We demonstrate and validate the end-to-end calibration procedure, achieving Cramer-Rao Lower Bounds. The …
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Dynamic operability assessment : a mathematical programming approach based on Q-parametrization
… adopted in this thesis is based on the Q-parametrization of stabilizing linear feedback controllers and involves posing dynamic operability assessment as a mathematical programming problet? In the proposed formulation, a convex objective function, reflecting a measure of closed-loop …
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On the geometry and parametrization of almost invariant subspaces and observer theory
In my Ph.D. thesis "On the geometry and parametrization of almost invariant subspaces and observer theory" I consider the set of almost conditioned invariant subspaces of fixed dimension for a given fixed linear finite-dimensional time-invariant observable control system in state space form. Almost …
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On the parametrization of self-adjoint extensions of singular Sturm-Liouville operators
… generalized boundary values. Therefore, the parametrization of self-adjoint extensions inherently depends upon the choices of principal and nonprincipal solutions. Using known properties of principal and nonprincipal solutions, Wronskian techniques, and the Pl¨ucker identity, we find the …
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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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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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Constructive geometry parametrization tools for computer-aided design, analysis, and optimization of aeropropulsive systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Analysis and algorithms for parametrization, optimization and customization of sled hockey equipment and other dynamical systems
A dynamical system, an ensemble of particles, states of which evolve over time, can be described using a system of ordinary/partial differential equations (ODEs/PDEs). This dissertation presents fundamental investigations of the analysis and algorithms for the study of dynamical systems, by …
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Tire Performance Estimation Under Combined Slip and Empirical Parametrization of the Tire Rut on Dry Sand
Applications like military, agriculture, and extra-planetary explorations require the successful navigation of vehicles across different types of terrain like soil, mud, and snow. As the properties of the terrain heavily influence the interaction with the tire, it is necessary to characterize the …
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Applications of adaptive controllers based on nonlinear parametrization to level control of feedwater heater and position control of magnetic bearing systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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The representation of cloud cover in atmospheric general circulation models
… Medium-Range Weather Fore- casts (ECMWF). Cloud parametrization has long been identified as one of the most crucial and uncertain aspects in General Circulation Models (GCMs) of the atmosphere, which are used for both Numerical Weather Prediction and the simulation of climate. It is therefore …
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Homotopy algorithms for the H² and the combined H²/H<sup>∞</sup> model order reduction problems
… form; Ly, Bryson, and Cannon's 2 X 2 block parametrization; a new nonminimal parametrization are developed and compared here. For the H² optimal model order reduction problem, these numerical algorithms are also compared with that based on Hyland and Bernstein's optimal projection equations. …
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Homotopy algorithms for H²/H<sup>∞</sup> control analysis and synthesis
… form; Ly, Bryson, and Cannon's 2 X 2 block parametrization; a new nonminimal parametrization—are developed and compared here. For the H² optimal model order reduction problem, these numerical algorithms are also compared with that based on Hyland and Bernstein's optimal projection equations. …
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Design of control systems based on Q(Youla)-parmetrization
… for control system design based on Youla(Q)-Parametrization. The fundamental concepts of the parametrization method have been used by Newton et al, Franklin and Raggazzini [Maciejewski, 1989] as early as 1957. The importance of its implications were not noticed during those years, but Youla …
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Exploring Immersed FEM, Material Design, and Biological Tissue Material Modeling
… for the optimization formulation, and various parametrization techniques are explored. The effectiveness of the approach is demonstrated through verification and case studies. For material design, the study combines topological shape optimization with IIFEM, providing a computational approach …
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