Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995. / Includes bibliographical references (leaves 113-115). / by Joseph A. Curcio. / M.S.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2002. / Includes bibliographical references (leaves 143-146). / by Katarzyna M. Niewiadomska. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996. / Includes bibliographical references (leaf 89). / by John Thoma sMass. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998. / Includes bibliographical references (p. 115-123). / by Richard Preston. / M.S.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004. / Includes bibliographical references (leaves 71-72). / In response to a growing interest in networked communications at sea as well as the needs of our vital commercial fishing industry, the Northeast Consortium funded a novel research initiative to establish wireless acoustic and radio communications at sea. The platform used for this type of telemetry instrumentation was to be a buoy which could not only withstand the often harsh conditions off the northeastern coast of America (specifically, Cape Ann), but do so while exhibiting an exceptionally small response in heave and roll. A spar type buoy was designed and built at the MIT Sea Grant facility. Spars are a special type of buoy shape whose hydrostatic and hydrodynamic interactions with the sea are decoupled enough so that extreme sea conditions do not induce extreme buoy motions. Most oceanographic buoys are of the discus type, and move as the surface of the ocean does. This type of wave-following buoy would not sufficiently facilitate the requirements of the high-bandwidth wireless networking hardware, and therefore would not serve the current purpose. / (cont.) The NEC buoy displaces approximately 140 kg of sea water and is roughly 11 feet long when fully assembled, not including its 5 foot antenna mast. The buoy employs a PC104 stack to control an 802.1 lb wireless card and antenna, an acoustic modem card and transducer, other peripheral instrumentation, a main battery, and a solar power system. / by Meghan Hendry-Brogan. / S.M.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005. / Includes bibliographical references (leaf 103). / Lorentz actuator dynamics in a fluid are governed by the fundamental principles of electromagnetism and hydrodynamics and have several potential applications in the marine field. Two areas of interest where improvements would lead to significant contributions are the turbulence control and underwater acoustic communication fields. The ability to control turbulence is directly associated with controlling drag. Shipping industries and naval institutions are constantly seeking ways to reduce drag on marine vessels. A reduction in drag would have significant impact in the marine field allowing reduced vessel fuel consumption and faster marine travel. Experimental implementation for turbulence control was carried out at the Marine Hydrodynamics Laboratory of MIT on a flat plate setup with an integrated Lorentz actuator cassette. The data acquisition system included a dynamometer setup with integrated load cells for direct force measurements, and a Laser Doppler Velocimetry system for measuring boundary layer profiles in the flow. The results showed apparent wall shear reduction of about 30% over the Lorentz actuated cassette using the boundary layer technique but no measurable change in drag with the direct force measurement method. Most of the hardware used today in underwater acoustic communications result in a limited frequency bandwidth for data transmission and is a function of the material properties used in the design. The advantage of using Lorentz actuators for underwater sound transmission is that the frequency bandwidth is controlled by the electronics which allows us to select broader ranges of frequency transmission. A hydrophone was used to quantify acoustic noise in a conducting fluid 100 mm from the surface of a Lorentz Actuator, and was measured to be 160 dB at a frequency range from 1 kHz to 20kHz. This frequency range was limited by the driver electronics available at the time of testing, however we expect an actual range up to 100 kHz with our new equipment. / by Daniel A. Sura. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997. / Includes bibliographical references (leaf 44). / by Richard Warren Kimball. / M.S.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989. / Includes bibliographical references (leaves 129-134). / by Rong-Juin Shyu. / Ph.D.

Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1988. / Includes bibliographical references. / by Gengshen Liu. / Sc.D.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005. / Includes bibliographical references (p. 92). / The terrorist attacks of September 11th 2001 on New York and Washington DC shed light on the many security shortcomings that sea ports and the entire import and export process face. A primary source of these problems is the information sharing process which makes it hard to track the source of a problem in the import and export process due to lack of information and coordination. This thesis attempts to examine these data sharing problems by looking at what federal agencies, ports, and other private firms have been doing to solve the problems. The document exchange between various stakeholders and the process behind that was also examined to find potential problems. The reason behind doing this is because it is essential to understand the process and its problems before any meaningful results can be extracted from examining the efforts being done to solve the problems. The findings were similar for all cases showing that the primary reason preventing any of these problems to be solved is the unwillingness of commercial stakeholders to share information due to lack of incentives and privacy concerns. / by Nikolaos Harilaos Petrakakos. / S.M.