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Showing 1 to 14 of 14 for “"nonlinear wave propagation"”.
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Discrete Nonlinear Wave Propagation In Kerr Nonlinear Media
… Weakly coupled arrays of single mode channel waveguides have been known to fall into this class of systems since the late 1960's. Nonlinear discrete optics has received a considerable amount of interest in the last few years, triggered by the experimental realization of discrete solitons in a …
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Experimentally informed modeling of nonlinear wave propagation and phononic behavior in prescribed delaminations
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Nonlinear Wave Propagation in Helical Springs by the Method of Characteristics and Finite-Element Method
Made available in DSpace on 2014-12-14T14:42:14Z (GMT). No. of bitstreams: 1 7804159.pdf: 3657121 bytes, checksum: 5824cc2fd849e0047c7f7189a22a5cd3 (MD5) Previous issue date: 1977
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Analytical and Spectro-Spatial Analyses of Nonlinear Metamaterials for Vibration Control, Energy Harvesting, and Acoustic Non-Reciprocity
This dissertation investigates the nonlinear wave propagation phenomena in nonlinear metamaterials with nonlinear chains and nonlinear resonators using analytical and spectro-spatial analyses. In the first part of the thesis, the nonlinear metamaterials are modeled as a chain of masses with …
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Adapting the Standard SIR Disease Model in Order to Track and Predict the Spreading of the EBOLA Virus Using Twitter Data
… of social users in a fashion similar to nonlinear wave propagation- like a shock wave, visualized as a spike in Tweet activity. The spreading was modeled as a system isomorphic to a modified SIR (Susceptible, Infected, Removed disease model) system of three coupled nonlinear differential …
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Discrete Wave Propagation In Quadratically Nonlinear Media
… evanescently coupled, equally spaced, identical waveguides are prime examples of optical structures in which discrete dynamics can be easily observed and investigated. As a result of discretization, these structures exhibit unique diffraction properties with no analogy in continuous systems. …
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Transient wave propagation on random fields with fractal and Hurst effects
… in natural sciences and engineering fields, wave propagation through random heterogeneous media is a significant area of fundamental and applied research. Recently two models have been developed, Cauchy and Dagum models, that can simulate random fields with fractal and Hurst characteristics. …
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Quantitative estimates of mechanical properties from in vivo tumors of rodent animals
… focuses on using ultrasonic tools to image shear waves generated in spontaneous rodent mammary tumors to estimate the complex shear modulus under realistic conditions, and to assess the sensitivity for relating matrix viscoelasticity to tumor type and stage. Cylindrical, harmonic shear waves …
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Nonlinear Acoustics in a General Waveguide
Until this present work, the acoustics of waveguides has been divided into two broadly distinct fields---linear acoustics in ducts of complex geometry such as those with curvature or varying width, and nonlinear acoustics restricted to simple geometry ducts without curvature or flare. This PhD …
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Nonlinear Effects in Contactless Ultrasound Energy Transfer Systems
… is transferred through the reception of acoustic waves by a piezoelectric receiver that converts the energy of acoustic waves to electrical voltage. It has been shown that UAET outperforms the conventional CET technologies that use electromagnetic waves to transfer energy, including inductive …
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Evolution Equations for Weakly Nonlinear, Quasi-Planar Waves in Isotropic Dielectrics and Elastomers
The propagation of waves through nonlinear media is of interest here, namely as it pertains to two specific examples, a nonlinear dielectric and a hyperelastic solid. In both cases, we examine the propagation of two-dimensional, weakly nonlinear, quasi-planar waves. It is found that such systems …
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Shockwave energy dissipation by mechanoresponsive materials
Shockwaves are characterized by high pressure and strain rate with extremely short duration about nanoseconds. Blast-induced traumatic brain injury sustained by personnel exposed to shockwave-generating high-energy explosives results in costly and debilitating health effects. Novel approaches for …
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Disc-planet interactions in inviscid discs
… to the excitation of global spiral density waves, which drive evolution of the disc (such as the opening of gaps) and the planets’ orbital properties (known as migration). Modern observations of PPDs, provided for example by the high resolution interferometer ALMA, have shown intriguing …
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Characterization of nonlinearity parameters in an elastic material with quadratic nonlinearity with a complex wave field
This research investigates wave propagation in an elastic half-space with a quadratic nonlinearity in its stress-strain relationship. Different boundary conditions on the surface are considered that result in both one- and two-dimensional wave propagation problems. The goal of the research is to …