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 943 for “"finite-difference"”.
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Finite-Difference Solutions of Consolidation Problems
Made available in DSpace on 2014-12-10T22:22:00Z (GMT). No. of bitstreams: 1 7317655.pdf: 5971221 bytes, checksum: 8b32bc6da748b8d6c134b509e14f3747 (MD5) Previous issue date: 1973
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Seismic wave modelling using finite difference methods
… boundary conditions used to manufacture a finite computational domain. The Reynolds ABCs are found to be marginally better than Clayton-Engquist ABCs and are stable in all cases for our approach. We also adopt a scaling technique with variable grid geometry so as to extend the scope of the …
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Finite difference method for electromagnetic scattering problems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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The generalised beam theory with finite difference applications
… modes. The second part of this Thesis develops a finite difference method of analysis, in conjunction with the theory of part I, toconsider the behaviour of a member subject to any arbitrary loading condition and end restraint. Both first order linear problems and second order elastic critical …
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Variable grid finite-difference modeling including surface topography
We have developed a two-dimensional viscoelastic finite-difference modeling method for highly complex surface topography and subsurface structures. Realistic modeling of seismic wave propagation in the near surface region is complicated by many factors, such as strong heterogeneity, topographic …
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Finite-Difference Approximations And Optimal Control Of Differential Inclusions
… constrained differential inclusions. We develop finite-discrete approximations of differential inclusions by using the implicit Euler scheme and the Runge-Kutta scheme for approximating time derivatives, while an appropriate well-posedness of such approximations is justified. Our principal result …
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Finite-difference time-domain analysis of horn antenna scattering
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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A finite difference forward model for MEG and EEG
… state of the art. The model uses an existing finite difference model for electroencephalography and modifies it to incorporate the Bi6t Savart Law into its geometry. I tested the model against a spherical model to show that it is highly sensitive to approximations made of the Bi6t Savart Law …
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Finite difference grid generation on serial and parallel machines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Finite difference seismic wave propagation using variable grid sizes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
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A geodesic finite-difference time-domain model of magnetized plasma
… Three-dimensional latitude-longitude finite-difference time-domain (FDTD) models accounting for the bathymetry, topography and ionosphere have been developed and applied towards a number of applications previously. However, to date most of these models treat the ionosphere as a simple, …
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Analysis of periodic structures using finite-difference time-domain method
… using the constant horizontal wavenumber finite-difference time-domain periodic boundary condition (FDTD/PBC). A new FDTD/PBC approach is introduced to analyze the scattering properties of general skegrid periodic structures. The approach is simple to implement and efficient in terms of …
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Analysis and Implementation of High-Order Compact Finite Difference Schemes
… smaller stencils than the traditional explicit finite difference counterparts. To avoid numerical instabilities at and near boundaries and in regions of mesh non-uniformity, a numerical filtering technique is employed. Experiments for non-stationary linear problems (convection, heat conduction) …
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Finite difference time domain analysis of microstrip antenna-circuit modules
Compact microstrip antenna-circuit modules, which could be used as front-ends for future wireless systems applications, require electromagnetic modelling due to the close interaction of the circuit with the antenna. Spectrum crowding and EMC/EMI issues call for modelling of the radiation of such …
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Finite difference methods for the advection equation / Peter John Steinle
Bibliography : leaves 211-216
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Time-stable high-order finite difference methods for overset grids
… flexible framework for implementing high-order finite difference methods to simulate compressible viscous flows over complex geometries. Although overset methods have been widely used to solve time-dependent partial differential equations, very few proofs of stability exist for them. In …
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Finite-difference time-domain simulation of the Maxwell-Schrödinger system
A thorough study on the finite-difference time-domain (FDTD) simulation of the Maxwell-Schrödinger system is given in this thesis. This system is a very effective tool to simulate and study the light-matter interaction between electromagnetic (EM) radiation and a charged particle in the …
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Time Asymptotic Finite Difference Solutions of the Corner Layer Equations
Made available in DSpace on 2014-12-10T23:36:43Z (GMT). No. of bitstreams: 1 7309920.pdf: 3589613 bytes, checksum: f0f7886dd9951e05da9a88d285a45fdd (MD5) Previous issue date: 1972
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Stresses in Composite Axisymmetric Shells by the Finite-Difference Method
Made available in DSpace on 2014-12-10T17:25:44Z (GMT). No. of bitstreams: 1 6901320.pdf: 2670616 bytes, checksum: 094a763be30169a6e63c39569d638689 (MD5) Previous issue date: 1968
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Finite difference techniques for body of revolution radar cross section
… exploit body of revolution symmetry, the use of finite-difference techniques with these geometries has not been throughly explored. This thesis investigates several finite-difference approaches which vary both in the approximations they introduce as well as the computational resources they …
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