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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
121

Large-eddy simulation of physiological pulsatile flow through a constricted channel

Hossain, Afzal 20 September 2012 (has links)
In this thesis, large-eddy simulation (LES) is used to simulate both Newtonian and non-Newtonian physiological pulsatile flows in constricted channels to gain insights into the physical phenomenon of laminar-turbulent flow transition due to the presence of an artificial arterial stenosis. The advanced dynamic nonlinear subgrid-scale stress (SGS) model of Wang and Bergstrom (DNM) was utilized to conduct numerical simulations and its predictive performance was examined in comparison with that of the conventional dynamic model (DM) of Lilly. An in-house LES code has been modified to conduct the unsteady numerical simulations, and the results obtained have been validated against available experimental and direct numerical simulation (DNS) results. The physical characteristics of the flow field have been thoroughly studied in terms of the resolved mean velocity, turbulence kinetic energy, viscous wall shear stress, and turbulence energy spectra along the central streamline of the domain.
122

Spectrally correct finite element analysis of electromagnetic fields

Pinchuk, Amy Ruth January 1988 (has links)
Direct solution for three dimensional electric or magnetic field vectors throughout the frequency spectrum is accomplished by a finite element formulation which includes displacement and conduction currents, and requires no special treatment for material interfaces. Analysis of bus bar and Bath cube eddy current problems demonstrate the capabilities of the method. / Spurious components in solutions to vector field problems are shown to corrupt deterministic solutions. These corruptions are identifiable with spurious modes familiar to high frequency modal analysis. Spectrally correct mixed order finite elements are demonstrated to retrieve accuracy in deterministic analyses. / The formulation may be limited by computer round-off at matrix assembly which affects the solenoidality of vector fields. Furthermore, extreme values encountered in low frequency eddy current analysis lead to ill conditioning and unreliable solutions. These numerical instabilities are overcome by parametric adjustment of permittivities. Error estimates are established to monitor inaccuracies introduced by permittivity adjustment.
123

Advanced modelling for on-line monitoring of structural integrity /

Isterling, William Martin. Unknown Date (has links)
Thesis (M.Eng.)--University of South Australia, 1998.
124

Eddy current characterization of torque stressed steel and the development of a shaft torque eddy current test system

Varonis, Orestes J. January 2008 (has links)
Dissertation (Ph. D.)--University of Akron, Dept. of Electrical and Computer Engineering, 2008. / "December, 2008." Title from electronic dissertation title page (viewed 12/29/2008) Advisor, Nathan Ida; Committee members, Robert J. Veillette, George C. Giakos, Jiang John Zhe, Gerald W. Young; Department Chair, Jose Alexis De Abreu-Garcia; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
125

Christian science als sociaal verschijnsel ...

Does, Leendert Pieter van der. January 1900 (has links)
Proefschrift--Amsterdam. / "Literatuuroverzicht": p. 303-315.
126

On fluxes and gradients in the surface layer under convective conditions /

Steeneveld, Gert-Jan. January 1900 (has links) (PDF)
Thesis (M. Sc.)--Wageningen University, 2001. / "July 2001." Includes bibliographical references (p. 47-49). Also available via the World Wide Web. http://www.geocities.com/gjsteeneveld
127

A multi-coil magnetostrictive actuator

Wilson, Thomas Lawler. January 2009 (has links)
Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Zinn, Ben T.; Committee Member: Book, Wayne; Committee Member: Glezer, Ari; Committee Member: Neumeier, Yedidia; Committee Member: Seitzman, Jerry.
128

Wind and turbulence structure in the boundary layer over the Antarctic Plateau

Dabberdt, Walter F. January 1969 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
129

Large Eddy Simulation of premixed and partially premixed combustion

Porumbel, Ionuţ. January 2006 (has links)
Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2007. / Yeung, Pui-Kuen, Committee Member ; Lieuwen, Tim, Committee Member ; Menon, Suresh, Committee Chair ; Seitzman, Jerry, Committee Member ; Syed, Saadat, Committee Member.
130

Christian science als sociaal verschijnsel ...

Does, Leendert Pieter van der. January 1900 (has links)
Proefschrift--Amsterdam. / "Literatuuroverzicht": p. 303-315.

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