Thesis (Ph.D.)--McMaster University (Canada), 1990. / Source: Dissertation Abstracts International, Volume: 53-01, Section: B, page: 0374. Supervisor: J. P. Carbotte.

Thesis (Ph.D.)--University of Delaware, 2007. / Principal faculty advisor: Siu-Tat Chui, Dept. of Physics & Astronomy. Includes bibliographical references.

Thesis (Ph.D.)--Tufts University, 2004. / Adviser: Lawrence H. Ford. Submitted to the Dept. of Physics. Includes bibliographical references (leaves 154-155). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

Thesis (Ph.D.)--McMaster University (Canada), 1995. / Source: Dissertation Abstracts International, Volume: 56-12, Section: B, page: 6838. Adviser: J. P. Carbotte.

Thesis (M.S.)--State University of New York at Binghamton, Watson School of Engineering and Applied Science (Electrical Engineering), 2007. / Includes bibliographical references.

Small unsteady disturbances of boundary-layer flow fields are often encountered in engineering applications, as for example, in the aerodynamics of a helicopter rotor or a turbine cascade or in a fluttering airfoil as well as in a variety of bioengineering problems. The present dissertation is a unified attempt to study some special classes of unsteady two- and three-dimensional incompressible and compressible . boundary-layer flows. The general character of the mathematical problem is investigated first for each particular area. Asymptotic solutions are then provided based on the assumption of small amplitude and small frequency of oscillation. Systems of general differential equations in a single variable are obtained and solved numerically by the shooting technique. A straightforward fourth order Runge-Kutta integration scheme is employed and the values of the functions at the edge of the boundary-layer are checked against the outer flow boundary conditions. In the first chapter we study simultaneously the effects of three dimensionality coupled with the response to outer flow oscillations. It is believed that the coupling will have significant implications in cascade flows where the finite span blocks the development of cross flows. Some interesting features of oscillatory three-dimensional flows are disclosed. In particular it is found that the coupling of the momentum equations permits the transfer of momentum from the chordwise to the spanwise direction. In this way it is possible to excite a fluctuating boundary layer flow in the spanwise direction even though there is no outer flow fluctuations. In the second chapter the response of laminar compressible boundary layers to fluctuations of the skin of the body or the outer flow are studied in the special case of a wall at the adiabatic temperature. Unsteady outer pressure fluctuations are considered for the first time and their effects to the energy equation and heat transfer is estimated. The analysis holds both for two-dimensional and axisymmetric configurations. / Ph. D.

Fluctuation phenomena are important to many physical systems, such as the fusion plasma. Noise theory is used to study the time and space correlations of stationary Markovian fluctuations that are statistically homogeneous and isotropic. The relaxation of the fluctuations is modeled by the diffusion equation. The spatial correlations are modeled by the exponential decay. Based on these models, the correlation function and the power spectral density of random fluctuations. We also find that the fluctuation-induced transport coefficients may be estimated by the correlation length and the correlation time. The theoretical results are compared with the observed plasma density fluctuations from tokamak and helimak experiments.

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

Spin and charge density fluctuations are important excitations in the strongly correlated systems, especially in the recently discovered high temperature superconductors. Several different theories on high temperature superconductors have been proposed based on spin fluctuations. However, experiments have also shown the existence of strong charge fluctuations. It is, therefore, desirable to investigate the physical consequences of the coexistence of strong spin and charge density fluctuations. As a first step toward a full understanding of both spin and charge excitations, a self-consistent theory is established. In this self-consistent theory, there are three important quantities, the spin susceptibility, the charge susceptibility, and the phonon Green's function. These three quantities are coupled together by the electron-phonon and phonon-spin fluctuation interactions. The phonon-spin fluctuation interaction is derived by making use of the spin-orbital coupling. For a strongly correlated system, the spin and charge density excitations have to be considered self-consistently. They are intimately related. The effects of antiparamagnons on phonons are also investigated. Antiparamagnons can have dramatic effects on phononic properties. It is found that new modes are formed in the presence of antiferromagnetic spin fluctuations. The de Haas-van Alphen effect in marginal and nearly antiferromagnetic Fermi liquids is studied. It is found that the de Haas-van Alphen frequency is unaffected by the anomalous response functions of the marginal and nearly antiferromagnetic Fermi liquids due to the absence of real parts of self-energies on the imaginary frequency axis. / Graduation date: 1993

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 106-114).