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 19 of 19 for “"nonlinear materials"”.
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Coupled theoretical and experimental methods to characterize heterogeneous, anisotropic, nonlinear materials: application to cardiovascular tissues
… soft tissues, which exhibit markedly nonlinear behavior when operating at physiologic strain levels. Therefore, GAIM was extended to consider large-deformation kinematics, a nonlinear closed-form structural model of planar fibrous tissue mechanics was utilized to describe the nonlinear …
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Multiscale design of nonlinear materials using a shape optimization scheme based on an interface-enriched GFEM
… in manufacturing techniques, the tailoring of materials with specific macroscopic properties has been the focus of active research in mechanical engineering and materials science over the past decade. The key challenge in this line of work is how to optimize the material microstructure to …
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Terahertz Second-Harmonic Generation in Extreme-Confinement Cavities
… dielectric cavity designs that combine (1) nonlinear materials enhanced by phonon resonances with (2) extreme field concentration in high-quality-factor resonators. An efficient device for THz SHG would enable cascaded parametric frequency converters extensible into the mid-IR spectrum and …
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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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A novel discrete damage zone model and enhancement of the extended finite element method for fracture mechanics problems
… method improves XFEM when applied to general nonlinear materials when crack tip analytical solutions are not available. For linear elastic materials, Branch functions are commonly used as crack tip enrichments. Typically, these are four functions derived from linear elasticity theory and added …
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Composite circular braid mechanics
… to model the yarns that constitute the braid as nonlinear materials enables the simulated response to span finite deformations. A scheme for nondimensionalizing the model parameters and governing equations for each mode of operation is also proposed and implemented. In an effort to validate the …
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Design of a constraint device for compliant bodies using quasi-conformal contact surfaces as applied to mouse imaging
… effect of quasi-conformal contact constraints on nonlinear materials. The constraint devices and techniques currently available for mice have limitations that have prevented further exploration of their biological structures. The theoretical model, design rationale, and testing results of a …
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Colloidal semiconductor quantum dots : from synthesis to photonic applications
… of 2-10nm, using wet chemical techniques. These materials are promising for telecom applications, as their band gap depends on the particle size and is tunable over the entire near-infrared spectral range. The main aim of the project was to investigate whether the high nonlinear refractive index …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
The fields of quantum and nonlinear optics have given rise to a variety of nonclassical states of light that have been proven to surpass certain limitations set by classical physics. Namely, certain squeezed and entangled states have been shown to beat the shot-noise limit when making precision …
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Methods and Implementation of Fluid-Structure Interaction Modeling into an Industry-Accepted Design Tool
… that contain three-dimensional geometries, nonlinear materials, thin-walled geometries, steep gradients, and transient behavior. The work also modeled scenarios that predict system failure and optimal design to extend service lifetime, thereby expanding upon current FSI literature. Four …
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Quantum noise propagation in nonlinear optical media
… limit the generation of squeezed radiation in nonlinear materials. In the first part of this dissertation a general quantum optical model is developed from fundamental principles to describe optical propagation in a broad variety of nonlinear media. The central distinction of the resulting …
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Localized deformation in soft solids around spherical cavities
… contraction provides a way to characterize these materials while avoiding some limitations of traditional techniques. Large deformations in these spherical geometries induce localized deformations at the surface of the cavity. In this thesis, I leverage these localized deformations, cracks during …
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Novel semiconductor based broadly tunable light sources
… the more traditional technologies, in particular nonlinear frequency conversion and parametric sources, have led to the realisation of a new generation of laser sources. Furthermore, the advent of a new generation of quasi-phase-matched, waveguided and semiconductor nonlinear materials together …
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Elastic wave tailoring at the macro/micro/nano- scales using intentional strongly nonlinear coupling
… There are two approaches to designing materials for wave tailoring: the first is to develop new materials by tailoring their atomic structure—for example metallic alloys, ceramic crystals and polymers. The second approach, adopted in this work, is to build “metamaterials” using the …
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Nonlinear structural design using multiscale topology optimization
This dissertation presents developments in nonlinear multiscale topology optimization. Our contribution consists of three parts: a multiscale design framework for nonlinear elastostatic problems; extension to nonlinear elastodynamics; and an elastoplastic design methodology for transient dynamics. …
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BRIDGING EXPERIMENT AND THEORY IN PORPHYRIN CHEMISTRY: DEVELOPING MATERIALS FOR SENSING, OPTICAL, AND CATALYTIC TECHNOLOGIES
… characterization of innovative porphyrin-based materials. Working within the SunLab group (renowned for its expertise in this field) provided an ideal environment to investigate new molecular architectures for applications in catalysis, sensing, solar energy conversion, and nonlinear optics …
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Transient Electromagnetic Waves in Nonlinear Media
… of transient electromagnetic waves in nonlinear media. It consists of a General Introduction and five scientific papers. The General Introduction gives a broad overview of nonlinear electromagnetic phenomena. The emphasis is on the representation of the constitutive functional modeling …