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 712 for “"resonances"”.
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The Structure of Baryon Resonances
Hamiltonian Effective Field Theory (HEFT) is a non-perturbative extension of effective field theory which provides a bridge between the infinite-volume scattering data of ex- periment, and finite-volume energy spectra from lattice QCD. By discretising a Hamilto- nian which has been constrained to …
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Acoustic Resonances in Ducted Jet Systems
The results of selected test cases are presented and the main features of resonant and non-resonant regimes for this model problem are discussed. A high-amplitude resonance, qualitatively similar to experiments in more complex geometries, was observed for a symmetric overexpanded M jet 1.2. It is …
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Giant multipole resonances in lead-208
"The differential photoneutron cross section of 208pb in the energy region 9.9 through 11.2 MeV was measured with gamma energy resolution of approximately 100 KeV using the University of 111inois bremsstrahlung monochromator. Neutrons from a 72% enriched 208pb target and an 88% enriched 206po …
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Power transfer through strongly coupled resonances
Using self-resonant coils in a strongly coupled regime, we experimentally demonstrate efficient non-radiative power transfer over distances of up to eight times the radius of the coils. We use this system to transfer 60W with approximately 45% efficiency over distances in excess of two meters. We …
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Flow induced acoustic resonances in heat exchangers.
This thesis describes an investigation into the acoustic phenomenon in in-line tubular heat exchangers subjected to cross flow. The flow through such a heat exchanger can result in the production of very high noise levels, which occur as a result of the excitation of an acoustic standing wave in …
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Numerical Study of Plasmon Resonances in Nanoparticles
Surface plasmon resonances in nanoparticles have numerous promising scientific and technological applications in such areas as nanophotonics, near-field microscopy, nano-lithography, biosensor, metamaterial and optical data storage. Consequently, the understanding of plasmon resonances in …
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Two-dimensional calculations of magnetic micropulsation resonances.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D.
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Temperature dependence of impurity resonances in cuprate superconductors
… using scanning tunneling microscopy (STM) of resonances generated by single atom scatterers. First, I report that impurity resonance peaks, near zero bias in the excitation spectrum, continue to exist above the superconducting transition temperature and prove that the impurity resonance peak …
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On Applications of Resonances, from One to Infinity
Resonances are everywhere. They have different manifestations and are used in many applications. In this work, we study multiple systems making use of resonances, with numbers ranging “from one to infinity.” First, we derive single-frequency bounds for the surface-enhanced Raman scattering (SERS) …
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Imaging transport resonances in the quantum Hall effect
We image charge transport in the quantum Hall effect using a scanning charge accumulation microscope. Applying a DC bias voltage to the tip induces a highly resistive ring-shaped incompressible strip (IS) in a very high mobility 2D electron system (2DES). The IS moves with the tip as it is scanned, …
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Trapped-modes, slow light and collective resonances in metamaterials
… extremely sensitive to positional disorder and resonances degrade rapidly with increasing randomization. These observed strong inter-element interactions render coherent metamaterials ideal candidates for gain-assisted functionalities as demonstrated by the suggestion and numerical study of a …
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Photochemical Tuning of Surface Plasmon Resonances in Metal Nanoparticles
Illuminated metal nanoparticles (MNPs) feature collective electron oscillations (so-called localized surface plasmons or LSPs) which facilitate concentrating light-matter interactions to length scales below the diffraction limit. Part I of this book describes two applications of this confinement …
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Dynamic control of plasmonic resonances with graphene based nanostructures
… properties of graphene and plasmon resonances in metallic nanostructures to achieve dynamic control of plasmon resonances. First, we show that it is possible to use the highly tunable interband transitions in graphene to effectively control the plasmonic resonance in mid-infrared …
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Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances
… in large part, to the localized surface plasmon resonances (LSPRs) of the particles, and in particles in the 5 nm to 200 nm width range, the dipolar LSPRs, in which incident light excites an oscillating electric dipole within the particle, is often the fundamental mode that gives rise to their …
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Evolution of orbit-orbit resonances in the solar system.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Nonlinear resonances in systems having many degrees of freedom
… subharmonic, combination and internal resonances in a weakly nonlinear system having many degrees of freedom. The system has cubic nonlinearities, modal linear viscous damping and is subject to harmonic excitations. The method of multiple scales, a perturbation technique, is used to …
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THz transmission and resistively detected resonances in III-V semiconductors
Contains fulltext : 312677.pdf (Publisher’s version ) (Open Access)
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Exotic charm resonances and coupled-channel scattering from lattice QCD
… We use lattice techniques to study hadronic resonances (unstable hadrons) containing charm quarks, with a focus on exotic hadrons. These are hadrons that cannot be described by simple quark-antiquark or three-quark configurations -- a model that works well for low-energy and stable (under the …
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The Use of Schwarz-Christoffel Transformations in Determining Acoustic Resonances
In this thesis, we set out to provide an enhanced set of techniques for determining the eigenvalues of the Laplacian in polygonal domains. Currently, finite-element methods provide a numerical means by which we can approximate these eigenvalues with ease. However, we would like a more analytic …
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