Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Meteorology. / Vita. / Bibliography: leaves 169-174. / Ph.D.

Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Meteorology. / Microfiche copy available in Archives and Science. / Vita. / Bibliography: leaves 241-244. / by Dale B. Haidvogel. / Ph.D.

Despite the fact that considerable information now exists on the major oceanic current system, off the Pacific Coast, little is known about the near shore currents in many regions of the west coast states. The Bodega Bay area of California is a case in point. Because of the proposed construction of a nuclear-powered steam plant on Bodega Head and its proximity to both the Pacific Marine Station of the University of the Pacific and to the future marine laboratory of the University of California, it has become necessary to learn as much as possible about the currents in the immediate vicinity of Bodega head. Prior to 1962, few or no current studies were made within the fifty fathom curve off Bodega Bay, although the Pacific Marine Station maintained two oceanographic stations off Bodega Head monthly from 1959 to 1963 as part of the CALCOFI program. One of these stations was at the head of Bodega Canyon, some 25 miles offshore, and the was on the 50 fathom isobath, about five miles offshore. This study describes the results of 28 drift bottle experiments performed from July 1962 to July 1963 in the Bodega Bay region. The point of release of the drift bottles in all experiments except the last three was the cove of Bodega Head about 4000 feet south of Horseshoe Cove. (This cove would be the outfall area for the effluent waters from a power generation plant on Bodega Head.) Two of the other three drift bottle releases were on a line WSW from Bodega Head to the head of Bodega Canyon, while the third release was just north of the mouth of Stemple Creek in Bodega Bay.

No description available.

No description available.

Thesis: Sc. D., Massachusetts Institute of Technology, Department of Civil Engineering, 1980 / Bibliography: leaves 173-175. / by David William Ostendorf. / Sc. D. / Sc. D. Massachusetts Institute of Technology, Department of Civil Engineering

When an electrical conducting volume is placed into the bore of an MRI undergoing an image scan, time varying magnetic gradients induce eddy currents in this conducting material. These eddy currents in turn produce a mechanical torque on this volume. It is the goal of this thesis to produce a computer simulation of eddy currents produced by placing conducting materials inside an MRI bore. The first part of the thesis establishes the physics and principles behind an MRI system along with several applications. Next, this thesis presents an analysis of eddy current effects produced on a conductor placed into an MRI bore. The design and construction of simulated MRI magnetic fields is then presented along with a study of simulated eddy currents in various test conducting volumes of selected materials. Finally, techniques are discussed for reducing eddy currents in these conducting volumes and materials, along with simulation results showing the reduction in the applied eddy current. The findings of this thesis are summarized in the conclusions and recommendations are made for modification and future applications of these techniques and simulations.

A coarse-grain parallelization of SHORECIRC - a quasi-3D nearshore circulation model is implemented. The parallelization is based on the message-passing model for distributed memory architectures using the Message Passing Interface (MPI) standard. The parallel model confirms to the Single Program Multiple Data (SPMD) model. The results from the parallel model have been verified against those from the sequential model for an exact match. The parallel code is portable across different parallel architectures and its performance in terms of speed-up and scalability is studied. A test case simulating rip currents is discussed.

No description available.

No description available.