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 20 for “"Particular Solutions"”.
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Localized Method of Approximate Particular Solutions for Solving Fourth-Order PDEs
<p>In the past, dealing with fourth-order partial differential equations using the Local Method was not reliable due to difficulties in solving them directly. An approach such as splitting these equations into two Poisson differential equations was adopted to alleviate such challenges. However, …
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A Time Integration Method of Approximate Particular Solutions for Nonlinear Ordinary Differential Equations
… which is coupled with the method of approximate particular solutions (MAPS) of Delta-shaped basis functions and the method of fundamental solutions (MFS) to solve nonlinear ordinary differential equations. Firstly, we convert a nonlinear problem into a sequence of time-dependent non-homogeneous …
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Localized Method Of Approximate Particular Solutions For Solving Optimal Control Problems Governed By PDES
<p>In this thesis, the method of approximate particular solutions(MAPS) and localized method of approximate particular solutions(LMAPS) with polynomial basis, and radial basis functions are proposed and applied on the optimal control problems(OCPs) governed by partial differential …
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Numerical solutions to Poisson's equation using radial basis functions
This thesis addresses the problem of obtaining solutions to Poisson's equation which is encountered in the applied sciences and engineering fields. Two separate methods are explained for obtaining particular solutions to this equation. The Method of Fundamental Solutions is then used to solve the …
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New Organized Crime: Problems and Issues for Information Analysis
… study highlights the problems of, and offers particular solutions for information analysis in its use in the fight against organized crime. Ultimately, it is argued that combined crime and intelligence analysis can be an effective and efficient method for the detection and prevention of modern …
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Steklov Eigenvalue Problems on Nearly Spherical and Annular Domains
… we develop numerical approaches based on particular solutions and show that numerical results in two and three dimensions are in agreement with our analytic results.</p>
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Algumas soluções do problema de difusão com sumidouro
… we saw ourselves forced to obtain some particular solutions that in a certain way allow us to judge the influence of the non - linearity on the considered process. Initially it had been obtained the general analytic solution of the progressive wave type in order to inmediately after …
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Analysis of Energy-Transport Models for semiconductors
… lattice is assumed constant. We fi nd some particular solutions and we discuss them behavior depending on physical parameters, as example for the silicon. The second energy transport model includes as variable the lattice temperature. A symmetry analysis approach to this model is performed. …
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The crystal structure of cholesterol helical ribbons
Helical ribbons form in a many multi-component solutions containing sterols similar to cholesterol, but remarkably, almost all the helices have a pitch angle of 11⁰ or 54⁰. The consistent pitch angle of the ribbons may be due to an underlying crystal structure. In order to determine the crystal …
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Nonlinear optimal control and near-optimal guidance strategies in spacecraft general attitude maneuvers
… method and ends with the indirect method of particular solutions is proposed. Test case results which indicate improved reliability are presented. The nonlinear optimal control law derived from iterative procedures cannot adjust itself in accordance with state deviations measured during the …
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In-plane vibrations of a transversely isotropic arch
… namely the Laplace transformation, the method of particular solutions, and the eigensolution. The eigensolution is chosen as the the most efficient in terms of computer time and is the easiest to modify. The free vibration of the arch is explored and the natural frequencies of the system are …
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A hierarchical framework for constructing computationally efficient algorithms for distributed inference problems
… constraints on energy and communication. In particular, solutions to the problem of information collection for target localization and the problem of multiple target tracking and classification are formulated and demonstrated using the proposed methodology.
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Combined gradient-restoration algorithm for optimal control problems
… problem, which is solved via the method of particular solutions. The descent properties of the algorithm are studied, and schemes to determine the optimum stepsize are discussed. In order to improve the convergence characteristics, the inclusion of a restoration phase is studied. In this …
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The interaction of periodic surface gravity waves with slowly varying water currents
… physical behaviour implied by the equations. Particular solutions are usually given only where they serve to clarify the general method or some physical feature of the analysis. The thesis proper is introduced by a derivation of wave kinematics on still water. A review of the kinematics and …
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Recognizing contextual continuities : investigations of the Charleston single house
… producing veneered images of the past. If these solutions for generating new structures are to be avoided, existing buildings and the resultant spatial relationships defined must be thoroughly understood. Here then is an investigation of Charleston's spatial structure from which certain design …
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High-performance switching architectures for optical networks
… for switching operations. In this Ph.D. thesis solutions for photonic packet switches, a flexible alternative with respect to circuit-switched optical networks are proposed. In particular solutions based on devices and components that are expected to mature in the near future are proposed, with …
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Design Methodology for Permeable Reactive Barriers Combined With Monitored Natural Attenuation
… of random hypothetical cases that used the solutions of the PRB conceptual model (Solution I). The analytical design equation was derived from particular solutions of the model (Solution II) which the study showed fit the complex solutions of the model well. Using the hypothetical cases, the …
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Deficiencies in online privacy policies : factors and policy recommendations
… the part of privacy regulating institutions. In particular, the EU Data Protection Directive (EU-DPD) and the US Safe Harbor Agreement (US-SHA) are based on comprehensive norms, but do not provide pragmatic guidelines for addressing emerging privacy hazards in a timely manner. The dearth of …
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The turn to the market in UK food policy 2002-2015 and its impact on the vegetable sector in England
… policy development. The research explored: how particular ideas of markets and marketing shaped wider UK Food Policy 2002-2015; how the marketing themes in UK Food Policy evolved; how UK Food Policy understood and framed the priorities for the vegetable sector which then opened up particular …
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Desarrollo de criterios nucleares de diseño de fuentes de neutrones de espalación
… sense, all works done to date seek to obtain particular solutions to a concrete design, but there has been no development of a defined methodology that allows guidance for an integral design. In the integral design of a spallation source, all relevant physical processes that may influence its …