Graduation date: 1966

A method is described for determining the absolute dynamic topography of the sea surface. Using hydrographic and wind data obtained in 1963, the surface topography and the horizontal and vertical mass transports off the southeast Arabian coast during the summer monsoon are calculated. As indicated by the calculations, upwelling occurs throughout a region extending at least 400 km offshore and paralleling the Arabian coast for over 1000 km. Upwelling is most intense in a narrow band adjacent to the coast. Because of the great breadth of the upwelling zone, the upwelled water is supplied from levels considerably deeper than those observed elsewhere in coastal upwelling areas. / Graduation date: 1969

Current observations were obtained at three locations forming a cross section along 70°34'W longitude in Long Island Sound. Fifteen days of data were selected from each series so that nearly simultaneous observations were used in the analysis. Elementary statistics were computed for the data prior to performing a least squares tidal current analysis. Eight tidal current constituents were fitted in two cases and nine in the remaining instance. Constituent current ellipses were constructed along with the average ellipses. Using the constituents previously computed, the tidal current was predicted for the period of observations. These values were subtracted from the observed current, generating a residual current series. Spectra were computed for each directional component along with cross spectra between the north and east components and also between corresponding components at each of the three different locations. Coherence square and phase relationships also accompanied the latter. An attempt was also made to correlate wind and the residual current by means of cross spectra. However, lack of sufficient wind data prevented a meaningful analysis. The natural period of oscillation of Long Island Sound was estimated by Defant's method of seiche analysis for a bay. This value was used in the equations for a cooscillating system and a comparison was made between the computed and observed amplitudes of the tide. The mean percent error for numerous locations throughout the Sound was 7.1%. Comparison was also made between the maximum flows computed from the above equations and some observed values. The maximum percent error was 24% in an ebbing direction. / Graduation date: 1971

The goal of this thesis is to identify and to explore novel ACTFEL phosphor materials. Several important materials properties relevant to ACTFEL phosphor development are identified. All of these properties cannot be obtained simultaneously. Therefore, several key phosphor materials properties are identified as critical to the development of an ACTFEL phosphor. Then, using basic chemical trends, several classes of potential ACTFEL phosphors are identified. These materials systems include halides, nitrides, oxynitrides, oxides, sulfides, and inhibited concentration quenching systems. Representative materials from some of these proposed novel ACTFEL phosphor materials system are developed and evaluated as electroluminescence phosphors. Most of the ACTFEL devices made using these materials do not show any significant charge transfer. Detailed analysis indicates that the most probable cause of the lack of charge injection is that the phosphor threshold field is too large. This excessively large threshold field may be associated with the energy depth of the interface states, the low density of the interface states, or the large effective mass of the phosphor material explored. Several possible alternative solutions are presented to reduce the threshold field of the phosphor. These includes the use of thick-film insulator, the use of a charge injection layer, the use of a ceramic substrate coupled with a high temperature interface reaction, and the use of bulk doping of the phosphor. / Graduation date: 1997

Thesis (Ph. D.)--Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1982. / Vita. Includes bibliographical references (p. 221-225).

Thesis (Ph. D.)--Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1983. / Includes bibliographical references (p. 226-229).

Thesis (Ph. D.)--Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1981. / Includes bibliographical references (p. 210-215).

Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: James T. Kirby, Dept. of Civil & Environmental Engineering. Includes bibliographical references.

Thesis (M.C.E.)--University of Delaware, 2005. / Principal faculty advisor: James T. Kirby, Dept. of Civil & Environmental Engineering. Includes bibliographical references.

Thesis (M.S.)--University of Delaware, 2006. / Principal faculty advisor: A.D. Kirwan, College of Marine and Earth Studies. Includes bibliographical references.