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.
Results
Showing 1 to 20 of 48 for “"Nonlinear interaction"”.
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Nonlinear interaction of water waves with three-dimensional floating bodies in a current
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1998.
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Nonlinear interaction of long-wave distrubances with short-scale oscillations in stratified flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Ultrasonic reflection mode imaging of the acoustic nonlinearity parameter
The problem of mathematically modeling the nonlinear interaction of ultrasound beams is addressed. The counterpropagation model is studied and a new model, called the copropagation reflection model, is proposed. The new model shows that the copropagation of the probe and the reflected pump leads to …
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Low-frequency variability of the zonal mean circulation induced by sea surface temperature variation and eddy feedback
… of the sea surface temperature (SST) and by the nonlinear interaction between unstable baroclinic waves and the zonal mean flow.
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Sources of difference frequency sound in a dual-frequency imaging system with implications for monitoring thermal surgery
… Additionally, it may be possible to use the nonlinear interaction of scattered waves to form images that rely on the presence of small scatterers; a technique that may be enhanced with the use of contrast agents containing small scattering micro-bubbles in vivo.
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
… wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. Numerical studies of oceanic internal waves (such as Broutman & Young, 1986) have suggested that under the right conditions a weak internal gravity wave can be strongly …
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Nonlinear interactions of internal gravity waves in a continuously stratified fluid
… wavefield being sufficiently energetic for nonlinear effects to play an important role in the internal wave dynamics. Numerical studies of oceanic internal waves (such as Broutman & Young, 1986) have suggested that under the right conditions a weak internal gravity wave can be strongly …
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Afferents integration and neural adaptive control of breathing
… evidence have revealed the existence of complex interactions of various afferent-efferent signals in defining the overall respiratory response. This thesis aims to explore the nonlinear interaction of afferents in respiratory control. In a series of computational simulations, it was shown that …
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Low-Frequency Variability in the Stratosphere
"We have run a dry, nonlinear, primitive equation spectral model with no externally forced variability and with a realistic time mean state, and we have observed low frequency variability (LFV) in the stratosphere with timescales on the order of hundreds of days. Time lagged correlations have …
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Numerical modeling of nonlinear mode interaction in semiconductor lasers and amplifiers to generate slow/fast light
<p>The nonlinear interaction (NLI) between modes in a semiconductor laser or amplifier is one of the techniques to obtain slow light (ng >> 1), fast light (-1 < ng < 1), phase conjugated reflection (also known as backward light (ng < 0)) and supercontinuum emission (also known as critically …
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Extended describing function method for small-signal modeling of resonant and multi-resonant converters
… a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an extension to the statespace averaging method, this …
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Response of soil–foundation–structure interaction of tall building (frame-wall) structural system under seismic effect
… of estimating the soil -foundation-structure interaction (SFSI) lead to either simplifying or ignoring this interaction. The structural and geotechnical engineers consider the foundation effect on the multi-story building design. Where both the structural and geotechnical analysis is usually …
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Analytical and Numerical Studies of the Generation and Propagation of Nonlinear Water Waves by a Wavemaker
The ability to predict the nonlinear effects of extreme wave events is paramount for the preparation of modern experimental tests in large wave basins. Currently, linear theory is routinely used, hence nonlinear wave-wave interactions between propagating waves are often ignored. In addition, the …
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Interaction of high frequency internal waves and the boundary layer on the continental shelf
… of most interest for the bottom boundary layer interaction problem. Examination of data from the pilot Coastal Ocean Dynamics Experiment (CODE I) shows that near bottom velocity fluctuations in the high frequency internal wave band were dominated by shoreward propagating, intermittent mode 1 …
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Towards A Mobile Damping Robot For Vibration Reduction of Power Lines
… Hamilton's principle and we consider the two-way nonlinear interaction between the MDR and the cable. The MDR is driven by a Proportional-Derivative controller to the optimal vibration location (i.e, antinodes) as the wind characteristics vary. The numerical simulations suggest that the MDR …
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The Effect of High Transverse Electric Fields on Thermal Radiation
… field to the surface, thereby inducing a nonlinear polarization of the surface, could violate this assumption. A flared concentric cylinder blackbody radiation source has been constructed in which a large electric field can be applied to the emitting surfaces to determine if radiative heat …
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A master equation approach to nonlinear optics and chemical reactions
… quantum statistical analysis of several nonlinear optical processes. As an introduction a master equation describing the time behaviour of the field in a general irreversible nonlinear interaction between an optical photon field and a number of two level atoms is given. This master …
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Wave-current interaction in water of finite depth
In this thesis, the nonlinear interaction of waves and current in water of finite depth is studied. Wind is not included. In the first part, a 2D theory for the wave effect on a turbulent current over rough or smooth bottom is presented. The logarithmic profile of the basic current is modified by …
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High-dimensional Multimodal Bayesian Learning
… which allow us to capture unknown, possibly nonlinear, interaction terms among high dimensional functional variables. In Chapter 4, we extend our investigation of leveraging structure in high dimensional datasets to the relatively new transformer architecture; we introduce a new penalty …
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Femtosecond Pulse Compression via Self-Phase Modulation in 1-Decanol
… spectral broadening technique exploits the nonlinear interaction of intense pulses focused into gas-filled hollow-core fibres. More recently, multiple crystal plates have been used to broaden the spectrum while using a self-focusing relay to maintain the beam quality. In this thesis, I …
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