Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Method of Images"”.
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Numerical techniques to compute the cutoff frequencies, modal fields, and dispersion characteristics in microwave planar media
… techniques for calculating modal fields, cutoff frequencies, and dispersion characteristics in shielded microwave planar transmission media are developed. The formulation uses the method of images to derive a Fourier series expression for the current on the inner conductor, a one-dimensional …
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A comparison of two computer models of sound propagation for a wedge shaped ocean over a penetrable bottom
The problem of determining the acoustic pressure in a wedge shaped wave guide is examined. Two computer models, one using the method of images, the other using coupled normal modes, are compared. This comparison is over the benchmark wedge of the Acoustic Society of America. Three scenarios were …
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Mathematical Models of Quiescent Solar Prominences
… atmosphere suspend and insulate dense regions of cool plasma known as prominences. The convection zone may be the mechanism that both generates and expels this magnetic flux through the photosphere in order to make these formations possible. The connection is examined here by modeling the …
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An analytic solution for the stress distribution in a semi- infinite strip loaded on the transverse edge
… on the transverse edge. Three different types of loading on the transverse edge are considered: (i) a segment of uniform load, (ii) two concentrated normal loads, and (iii) two concentrated tangential loads. The solution is constructed by the method of images. Under successive reflections the …
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Direct numerical simulations and experimental investigation of dielectrophoresis
… with the numerical and experimental studies of the phenomenon of dielectrophoresis, i.e., the motion of neutral particles in nonuniform electric fields. Dielectrophoresis is the translatory motion of neutral particles suspended in a dielectric medium when they are subjected to an external …
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ΕΞΟΜΟΙΩΣΗ ΡΟΙΚΟΥ ΠΕΔΙΟΥ ΑΞΟΝΟΣΥΜΜΕΤΡΙΚΩΝ ΣΩΜΑΤΩΝ ΣΕ ΘΑΛΑΜΟ ΜΕΤΡΗΣΕΩΝ ΑΕΡΟΣΗΡΑΓΓΑΣ
STUDY OF THE CALCULATION OF THE SUBCRITICAL FLOW-FIELD AROUND AXISYMMETRIC BODYWITHIN A WORKING SECTION OF A RECTANGULAR CROSS SECTION AND TO THE SIMULATION OF THE UNCONFINED FLOW PATTERN APPLYING THE CONTOURED WALL TECHNIQUE FOR THE MINIMIZATION OF THE WALL INTERFERENCE. THE CONFINED AND POTENTIAL …
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Numerical and experimental analysis of initial water impact of an air-dropped REMUS AUV
The initial water impact of a free-falling object is primarily related to the fluid forces on the wetted surface of the object. The shape-dependent added-mass coefficients express the fluid forces integrated over the body, and thus physically represent the additional inertia of water accelerated …
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Dynamics of near-shore vortices
… problems: 1) the dispersion induced by a cloud of vortices near a straight coast-line when the bottom is flat and the coastal boundary is a vertical plane or when the bottom is a planar slope; 2) the dynamics of vortices moving over a planar sloping bottom. Vortices near a vertical boundary are …
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Characterizations of and closed-form solutions for plain vanilla and exotic derivatives
This dissertation is composed of three stand-alone research projects on the valuation of contingent claims. The first essay proposes an extension of the Kou (2002) double exponential jump-diffusion model. Displacing the two exponential tails introduces additional degrees of asymmetry in the jump …
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Some mixed and associated boundary value problems in the theory of thin plates
The bending of thin flat plates has occupied the interests of mechanicians and applied mathematicians since J. L. Lagrange discovered the differential equation characterizing the behavior of such structural members. One particular phase of investigation in this field concerns itself with the …
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Numerical simulation of feedback control of aerodynamic configurations in steady and unsteady ground effects
A general numerical simulation of closely coupled lifting surfaces in steady and unsteady ground effects was developed. This model was coupled with the equations of motion to simulate aerodynamic-dynamic interaction. The resulting model was then coupled with a feedback-control law to form a general …
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Aeroacoustics Applications to Jets and Rotors
… plays a critical role in the advancement of propulsion technologies for both conventional and emerging aerial systems. This dissertation investigates two key topics: noise suppression in supersonic rectangular jets and rotor noise characterization in hover and ground effect. Using …
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Fluctuation-induced interactions and nonlinear nanophotonics
We present theoretical and numerical methods for studying Casimir forces and nonlinear frequency conversion in nanophotonic media consisting of arbitrary geometries and materials. The first section of the thesis focuses on the study of various geometry-enabled resonant effects leading to strong …