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 46 for “"Conservation law"”.
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Dynamic compensators for a nonlinear conservation law
… and a fixed-order-finite-dimensional control law (Optimal Projection) by minimizing various energy functionals. These control laws are then applied to the nonlinear model. Different approximation schemes are used to design suboptimal active feedback controllers. This approach provides …
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The Relation of Patent Law and Wildlife Conservation Law in the United States
… management questions. The relation of patent law to wildlife conservation law is central to answering these questions. Patent law is designed to foster technological advancement, and patents are economic instruments intended for market-related activities. Conversely, wildlife conservation law …
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Solution of conservation laws via convergence space completion
… of the initial value problem for a scalar conservation law may fail to exist on the whole domain of definition of the problem. For this reason, suitable generalized solutions of such problems, known as weak solutions, have been considered and studied extensively. However, weak solutions are …
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Invariant-region-preserving discontinuous Galerkin methods for systems of hyperbolic conservation laws
… Galerkin (DG) schemes solving hyperbolic conservation law systems. In particular, our focus is on designing an IRP limiter to modify the numerical solution and identifying sufficient conditions for IRP DG schemes by extending Zhang and Shu's work on positivity-preserving schemes for …
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The interaction of shock waves and dispersive waves
… This nonlinear equation is a hyperbolic conservation law forced by the dispersive wave.
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Construction of a Multi-Dimensional Lagrangian Hydrodynamics Model of a Plasma Using the Lie Group Theory of Point Transformations
The translation conservation laws were used in a two-dimensional computer simulation of the confined eddy problem to demonstrate an application of the equations. Comparison of the results produced by the code using the conservation law governing equations with previous work is limited to …
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An adjoint-based optimization method using the solution of gray-box conservation laws
… be formulated as an optimization constrained by conservation laws. Such optimization can be efficiently solved by the adjoint method, which computes the gradient of the objective to the design variables. Traditionally, the adjoint method has not been able to be implemented in "gray-box" …
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A gene pool approach to international wildlife law
The current approach to wildlife' conservation law is anthropocentric and ad hoc in the manner in which it deals with species and groups of species. It lacks a sound ecological foundation and would benefit from the establishment of a new approach based on ecology and genetics. Before considering …
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Multi-Symplectic Integrators for Nonlinear Wave Equations
… structure characterized by a multi-symplectic conservation law MSCL). Then multi-symplectic integrators (MSIs) are numerical schemes that preserve exactly the MSCL. Remarkably, we demonstrate that, although not designed to do so, MSIs preserve very well other associated local conservation laws …
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Model Abstraction in Dynamical Systems: Application to Mobile Robot Control
… systems with deterministic initial conditions. A conservation law is applied to the probability density function (pdf) requiring that the area under it be unity. Application of the conservation law results in a partial differential equation known as the Liouville equation, for which a closed form …
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Continuity in Rigid Viscoplastic Flow
… is derived for the elastic spin field from a conservation law for Burgers vector content---a consequence of an averaged field theory of dislocation mechanics. This results in a nonlocal evolution equation for the rotation field in rigid viscoplasticity. The continuity condition provides a …
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Black oil simulation utilizing a central finite volume scheme
… addition, convergence rates on simple hyperbolic conservation law problems provided in this thesis indicate that the KT scheme is second order. Results obtained from simulations are in alignment with published literature and simulations also accommodate changing variables with predictable …
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The Gregory--Laflamme Instability and Conservation Laws for Linearised Gravity
… The remainder of this thesis is concerned with conservation laws associated to the linearised vacuum Einstein equation. For later application, chapter 2 of this thesis contains a review of the double null gauge for the vacuum Einstein equations. In chapter 3, the `canonical energy' conservation …
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Solving transport-density equation with diffusion using the first integral method and the generalized hyperbolic functions method
… compelling evidence that regularization of the conservation law by adding viscosity that will undeniably remove the singularity and the weak solution obtained by the characteristic method. As long as, continuity equation leads to discontinuous solutions, abrupt change of the traffic density; …
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Application of Lie Groups to Discretizing Nuclear Engineering Problems
… with Noether's theorem is shown to generate a conservation law that can be used to create a two-term recurrence relation which calculates numerically exact Green's functions in one dimension for the time-independent neutron diffusion equation for Cartesian, cylindrical, and spherical …
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Viscous-inviscid interactions of dense gases
… by solving the Navier-Stokes equations in conservation-law form numerically. The numerical scheme is based on the Beam and Warming’s implicit method with approximate factorization. We examine the flow of Bethe-Zel’dovich-Thompson (BZT) fluids at pressures and temperatures on the order of …
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Solution of fluid-structure interaction problems using a discontinuous Galerkin technique
… equations for the deforming domain. A geometric conservation law (GCL) is then introduced, which guarantees freestream preservation of the numerical scheme. The space discretization is performed using a discontinuous Galerkin method and time integration is performed using either an explicit four …
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Well balanced Arbitrary-Lagrangian-Eulerian Finite Volume schemes on moving nonconforming meshes for non-conservative Hyperbolic systems
… of our ALE scheme is the use of a space-time conservation formulation in the construction of the final Finite Volume scheme: the governing PDE system is rewritten at the aid of the space-time divergence operator and then a fully discrete one-step discretization is obtained by integrating over …
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Marginal strips : how best to allow public access to lakes, rivers and the sea?
The marginal strip provisions in the Conservation Law Reform Bill 1989 are the latest in a long line of legislation to reserve in Crown ownership what is commonly known as the "Queen's Chain". The analysis identifies public access as the "historic" objective of marginal strip legislation and the …
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Meta-learning and Enforcing Useful Conservation Laws in Sequential Prediction Problems
… of models where an unsupervised, meta-learned conservation loss is optimized inside the prediction function. This adapts the model weights to the particular input and imposes the approximate meta-learned conservation law in the predictions. We show, theoretically and experimentally, that …
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