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An exponential growth in the offshore industry has resulted in a corresponding increase in demand for quick, accurate, and implementable designs. With the increase in size of the structure relative to the wave amplitude, analysis should be performed using the diffraction theory. The steady wave drift force on a submerged body is a second-order quantity. With a potential flow assumption, the force arises from the diffraction and radiation of the waves from the interaction with the body. For a fixed body in waves the steady force is contributed from the wave diffraction effect alone. Numerical solutions for are generally needed for the computation of the steady drift force on submerged structures. In this study the steady wave drift forces on several fixed bodies of basic shapes are derived in closed form. The thesis addresses the steady drift forces on the following basic structures: a box, a vertical circular cylinder, a submerged horizontal cylinder, a bottom-seated horizontal half cylinder, a bottom-seated hemisphere, a submerged sphere, and an ellipsoid. The results developed demonstrate the importance of various independent non-dimensional parameters. To achieve speed and accuracy of the analytical/numerical solutions for the second order forces on the basic bodies with symmetry has been presented. Mathematical formulation of the boundary value problem and its second order solution have been described using the different coordinates depending on the symmetry and nature of the object. Charts and formulas have been developed to provide solution for the second order wave forces on different basic structures like cylinder, sphere and ellipsoids. This study is helpful for a first pass estimate of the steady drift force where the translational and rotational contributions are neglected. The illustrative examples provide a sense of the accuracy and an approach to bound the results of complex geometries by approximating them as simpler geometries.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

In recent years experimental advances at the GAMMA-10 facility in Tsukuba, Japan have shown that tandem mirrors should remain an important subject for theoretical study. The absence of toroidal curvature and relatively weak internal plasma parallel currents in a tandem mirror gives the mirror system strongly favorable stability and transport properties compared with toroidal systems. GAMMA-10 experiments (T. Cho et al. PRL (97), 2006) demonstrate that sheared plasma rotation suppresses turbulent radial losses by controlling radial potential profiles. Achievements of the GAMMA-10 include 2.5 keV ion confining potentials and electron temperatures approaching 1 keV (T. Cho, Private correspondence, Dec 24th, 2006). Total energy confinement times for the GAMMA-10 experiment are significantly larger than corresponding empirical confinement times in toroidal devices. At the temperatures currently achieved in the GAMMA-10, the end loss rate [mathematical symbols] 100 ms so that radial losses determine the energy confinement time [mathematical symbol], as intended in tandem mirror reactor designs (R. F. Post, T.K. Fowler, et al., Fusion Science and Technology, (47), 2005). The most current measurements of [mathematical symbol] are on the order of 72 ms. Tandem mirrors exhibit a qualitatively different type of drift wave transport than do toroidal devices, as we have shown by developing confinement time scaling predictions (J. Pratt and W. Horton, Phys. Plasmas (13), 2006. W. Horton, J. Pratt, H.L. Berk, M. Hirata. Proceedings of the Open Magnetic Systems For Plasma Confinement Conference. Tsukuba, Japan, July 17-21, 2006). These predictions use a variety of standard transport models, e.g., Bohm, gyro-Bohm, and electron-temperature gradient models. We analyze electrostatic drift wave eigenmodes for the electrostatic potential and the magnetic perturbation in the GAMMA-10. We use teraFLOPS speed, large scale parallel computers to integrate the orbits in models of the drift wave losses in the GAMMA-10. We extrapolate these results to reactor designs for the kinetically stabilized tandem mirror reactor proposed by Post et al., and discuss implications for its stability, transport, and performance. / text

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Thesis (M.S.)--University of North Carolina Wilmington, 2007. / Includes bibliographical references (Leaves: 75-80)

Thesis (M.S. in Physics)--Naval Postgraduate School, June 2009. / Thesis Advisor(s): Haegel, Nancy M. "June 2009." Description based on title screen as viewed on July 10, 2009. Author(s) subject terms: Cathodoluminescence, Diffusion, Drift, Mobility, Lifetime, Bismuth Ferrite, BiFeO3 , Semiconductor, Transport Imaging. Includes bibliographical references (p. 61-62). Also available in print.

M.M. Leighton's Thesis (Ph. D.)--University of Chicago, 1916. / "Private edition, distributed by the University of Chicago Libraries, Chicago, Illinois." "Reprinted from Iowa Geological Survey, volume XXVI, Annual report for 1915."

Stuttgart, Univ., Diss., 2000.

Thesis (Ph. D.)--University of Texas at Austin, 2009. / Title from PDF title page (University of Texas Digital Repository, viewed on Sept. 9, 2009). Vita. Includes bibliographical references.