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 20 of 74 for “"nonlinear interactions"”.
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Nonlinear interactions of acoustic-gravity waves
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Experimental investigation of nonlinear interactions of drift waves
… This wave and the ordinary drift wave interact nonlinearly to produce new waves at the sum and difference frequencies. The amplitude of the wave at the difference frequency is an order of magnitude smaller than that of the primary waves which have the same order of magnitude amplitude. The …
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Steady-state nonlinear interactions of surface acoustic waves.
Thesis. 1977. Elec.E.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Nonlinear interactions among standing surface and internal gravity waves
… from surface to internal gravity waves in a nonlinear, resonant interaction. The interacting waves form triads for which σ1s - σ2s ± σI = 0 and κ1s - κ2s ± κI = 0; σj and κj being the frequency and wavenumber of the jth wave. In particular, the experiment is designed to model a generating …
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Nonlinear interactions among standing surface and internal gravity waves,
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1972.
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Ultrafast Dynamics and Nonlinear Interactions in Alkali Atoms and Diatomics
… Cesium dimer and to study atomic wavepackets and nonlinear effects in Rubidium and Potassium. Two color, pump-probe techniques have been used to probe the time evolution of wavepackets in the B, C, and D rovibrational levels of Cs$\sb2$. The temporal history of the wavepacket is inferred from the …
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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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A new numerical method for the problem of nonlinear long-short wave interactions
… a new numerical method to address the problem of nonlinear interactions of free-surface gravity waves. More specifically, this study addresses the case of wave interactions of short waves ridding on longer waves up to second order of nonlinearity M. The study of the nonlinear interactions between …
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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
… its time-delayed replica, or another pulse, in a nonlinear material or device to yield a two dimensional data set called a spectrogram, from which the electric field of the ultrashort pulse can be retrieved by an iterative algorithm. The most commonly used configuration is based on second-order …
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Using hyperentanglement for advanced quantum communication
… in particular, because photons lack the strong nonlinear interactions required for building up many-particle entangled states and performing multi-photon gates; nevertheless, because photons are currently the only ""flying qubit"", i.e., qubits that are mobile, they are a required resource for …
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Alfven-Rossby Waves in Rotating Magnetized Stars
… of kinematic drifts. We studied the weakly nonlinear interactions between linear Alfven-Rossby waves. We used a spherical harmonic representation in which the fully nonlinear MHD equations are replaced by an equivalent system of first order ODEs. We computed the coupling coefficients …
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Stochastic modelling for control and interconnections of biological systems
… networks can consist of many species, including nonlinear interactions and combining series and parallel interconnections, making simu- lation methods computationally expensive and approximation methods inaccurate in the low copy number regime. The Conditional Poisson Approximation CPA method …
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Interaction of waves in a two-layer density stratified fluid
… the first part of this thesis, the mechanisms of nonlinear resonant interaction of surface-interfacial waves with a rippled bottom in a two-layer density stratified fluid in two dimensions is investigated via perturbation analyses and direct simulation. Three classes of Bragg resonances are found …
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Applications of optical parametric downconversion : I. Self-phase locking, [and] II. Generation of entangled photon pairs in periodically-poled lithium niobate
Nonlinear optics plays a key role in many applications not only as a means of frequency synthesis and control, but also as a source of twin photons and other nonclassical states of light. Advances in nonlinear materials, including engineered nonlinear interactions through the use of quasi-phase …
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Optical breakdown acoustics : transduction and sensing underwater
… laser is focused to a small spot, causing nonlinear interactions between the light and water. A compact plasma forms at the focus and expands explosively, radiating a loud, broadband pressure wave.
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Time-dependent assimilation of CTD data to an open ocean Rossby wave model
… used to evolve the waves in time, then the weak nonlinear interactions between the waves are incorporated into the model. The wave-wave interactions enable the waves in the barotropic mode to enter into the model state evolution as an unknown control variable. Three techniques from optimal …
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Artificial Neural Network and Dynamic Probabilistic Risk Assessment for passive safety systems
… components, enabling accurate modeling of nonlinear interactions and complex failure scenarios that traditional methods might overlook. DPRA, implemented using the EMRALD tool, provided dynamic, time-dependent analysis of system interactions and accident progression, offering a realistic …
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High intensity femtosecond enhancement cavities
… fraction of the pulse energy is lost in the nonlinear interactions, so it is possible to enhance the pulse intensity in a passive cavity retaining the original repetition rate. I present here a novel broadband resonator design which has the potential of supporting intracavity intensities in …
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