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.
Results
Showing 1 to 20 of 1876 for “"Boundary conditions."”.
-
Estimating open-ocean boundary conditions : sensitivity studies
The problem of estimating boundary and initial conditions for a regional open-ocean model is addressed here. With the objective of mimicking the SYNOP experiment in the Gulf Stream system, a meandering jet is modeled by the fully nonlinear barotropic vorticity equation. Simulated observations of …
-
Estimating open-ocean boundary conditions : sensitivity studies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
-
Coupled non-linear diffusion under periodic boundary conditions
… assists in the management of soil in adverse conditions. Equally, the governing equations contain features central to the concerns of contemporary mathematics.<br/><br/>The controlling equations are derived from basic physical principles. The resulting simultaneous, non-linear partial …
-
Compressed absorbing boundary conditions for the Helmholtz equation
… offer an accurate approximation of an absorbing boundary condition for the Helmholtz equation in a heterogeneous medium. It is always possible to reduce an absorbing layer to an operator at the boundary by layer-stripping elimination of the exterior unknowns, but the linear algebra involved is …
-
Control of Burgers' Equation With Mixed Boundary Conditions
… and control for Burgers' equation with mixed boundary conditions. We first conduct numerical experiments to test the convergence and stability of two standard finite element schemes for various Robin boundary conditions and a variety of Reynolds numbers. These schemes are used to compute LQR …
-
Krylov Subspace Spectral Methods with Non-homogenous Boundary Conditions
… heat equation with non-homogenous boundary conditions. While current methods such as Finite Difference are able to carry out these computations efficiently, their accuracy and scalability can be improved. We will solve the heat equation in one-dimension with two cases to observe the …
-
On the boundary conditions for dissipative particle dynamics (DPD)
… virtually no density fluctuation near the wall boundary. Two test cases of Couette flow and lid driven cavity have been done to show that DPD can be used successfully to validate the results. In order to simulate flows where periodic boundary condition cannot be applied, a source-sink method is …
-
Constraint preserving boundary conditions for the linearized Einstein equations
… system and analyze different kinds of boundary conditions that are designed to ensure that the constraints vanish throughout the computational domain: the Neumann, Dirichlet, and Sommerfeld cases. In addition to the situation in which the boundary is aligned with a coordinate surface, …
-
Boundary conditions, effective action, and Virasoro algebra for AdS₃
… and use it to study conformal symmetry in the boundary of AdS3. By requiring finiteness of the boundary effective action(s) for certain asymptotic transformations, we derive the well known Virasoro algebra and central charge associated with the boundary of AdS3. Our Virasoro generating …
-
Thermal boundary conditions for heat pipe assisted crystal growth
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
-
The replacement of reflectors by Albedo-type boundary conditions.
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
-
An Empirical Examination of Boundary Conditions of Relational Exchange
… research appears to lack an understanding of the boundary conditions of successful relational exchange. This dissertation contributes to filling this gap by clarifying what is understood as relational exchange and differentiating it from vertical integration. Here, a two-dimensional perspective on …
-
Establishing Boundary Conditions for Optimized Reconstruction of Head Impacts
… technologies must closely mirror real-world conditions. This dissertation explores the boundary conditions essential for accurately replicating head impacts in laboratory settings. The research aims to improve the reconstruction of head impacts, concentrating on two main areas: 1) examining …
-
Convection from manufactured ice roughness with varying flux boundary conditions.
… transfer for ice roughness with constant thermal boundary conditions. This work investigates the effect of variable heat flux boundary conditions on convective heat transfer, and improves upon the techniques used to obtain convective heat transfer measurements for realistic ice roughness patterns.
-
Heat kernel estimates for elliptic operators with Robin boundary conditions
… open set Ω ⊂ Rd where d ≥ 2, subject to Robin boundary conditions ∂νu + βu = 0. We show that the kernel for the semigroup generated by −A satisfies Gaussian and Hölder Gaussian bounds given domain and coefficients regularities. In particular we show that when the domain is Lipschitz and the …
-
Perturbations of Partial Differential Operators by Means of Boundary Conditions
Made available in DSpace on 2014-12-14T13:09:40Z (GMT). No. of bitstreams: 1 7913629.pdf: 2041407 bytes, checksum: 5ffcd48fdc7afa5e489878ade2bacf92 (MD5) Previous issue date: 1978
Page 1 of 94