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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 115 for “"Time reversal"”.
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Mössbauer time-reversal studies
We have investigated Mössbauer time-reversal experiments, in an attempt to lower the upper limit on the time reversal violating part of the mixed electromagnetic=hadronic Hamiltonian. We were unsuccessful in the search for experimental conditions which would have permitted lowering the limit by a …
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Estimating intrinsic attenuation from seismic interferometry and time reversal
Includes bibliographical references (pages 45-49).
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Spatiotemporal processing and time-reversal for underwater acoustic communications
… channels can be characterized as rapidly time-varying systems that suffer severe Inter Symbol Interferences (ISI) caused by multi-path propagation. Multi-channel combining and equalization, as well as time-reversal techniques, have been used over these channels to reduce the effect of ISI. …
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Quantum transport theory of 3D time-reversal invariant topological insulators
We consider the potential technological role of a recently predicted and discovered phase of quantum matter - topological insulators (TIs), which are characterized by an insulating bulk and topologically protected, gapless, spin-momentum locked surface modes. Precise engineering of these gapless …
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Electromagnetic response of time-reversal breaking metallic phases in two dimensions
… in two-dimensional electron fluids in which the time-reversal symmetry is broken spontaneously by using the method of higher dimensional bosonization. Mean-field calculations show that the order parameter is two two-component real vectors [Sun and Fradkin 2008]. There are two phases: the beta …
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Monte Carlo Simulations For J-Parc E06: Time Reversal Experiment With Kaons
<p>The Time Reversal Experiment with Kaons is an experiment being performed at JPARC with a worldwide collaboration. This experiment promises to push the upper limit of the T-violating parameter ξ to a new low and possibly be the first to directly see T-symmetry breaking on the quantum level. In …
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Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications
Time-reversal (TR) was originated in acoustics as a technique for re-focusing waves around their source location. Under certain conditions, the wave equation is invariant under TR, therefore, waves emanated from a source or scattered from a passive target, and recorded by a transceivers array, will …
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Beta-Gamma-Gamma Correlation in Manganese-56: A Test of Time Reversal Invariance
Made available in DSpace on 2015-05-12T21:41:35Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6612332.PDF: 1782382 bytes, checksum: 50df772b3e2dd381b067590e3166040b (MD5) Previous issue date: 1966
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Detection, classification and localization of seabed objects with a virtual time reversal mirror
… objects in shallow water environments using a time reversal approach in a bistatic configuration. The waveguide is insonified at low frequency ('kHz) with an omnidirectional source and the resulting scattered field is sampled by a receiving array towed behind an Autonomous Underwater Vehicle …
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An iterative time reversal high-power microwave approach to detect resonant frequencies of electronics
Iterative time reversal is a signal processing technique used with wideband electromagnetic pulse reflections from scatterers that has been shown to self-focus on the dominant frequency of simple resonators. Frequency selective iterative time reversal can be implemented to converge on the most …
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Beta-gamma-gamma correlation in Mn[superscript 56] : a test of time reversal invariance
An experiment to measure time reversal violation in two beta-gamma-gamma cascades of Mn (2.58 h) is discussed. We show how one measures the interference terms in ft-Y-o correlations using experimental quantities. We explain in detail the systematic errors involved in an accurate correlation …
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New Techniques for Time-Reversal-Based Ultra-wideband Microwave Pulse Compression in Reverberant Cavities
… for generating USPs using electromagnetic time reversal (TR) techniques have been developed in the last decade, and are the topic of this dissertation. This dissertation presents a compact TR microwave pulse-compression cavity that has ultra-wide bandwidth (5 GHz – 18 GHz), and employs …
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A Minimally Invasive Ultrasound Therapy Based On Time- Reversal Acoustics For The Treatment Of Deep Vein Thrombosis
… therapeutic aid. We have used the principles of time-reversal acoustics to develop an ultrasound modality that thrombolyses the clot without the aid of any thrombolytic. We hypothesize that this modality would aid in the development of a treatment methodology that would reduce the dosage of …
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Part I. Higher Order Effects in Beta-Decay. Part Ii. The Beta-Gamma Correlation and Time Reversal Invariance
Made available in DSpace on 2015-05-12T17:12:11Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 5805437.PDF: 3667728 bytes, checksum: 03b9ce28123db5a12b27c629ebf09eb1 (MD5) Previous issue date: 1958
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Suppression of disorder-induced scattering in optomechanical systems
… from disorder can be suppressed by breaking time-reversal symmetry in magneto-optic (Sov Phys JETP, 59, 1, 1984; Phys Rev B, 37, 1988) and topological insulator materials (Phys Rev B, 38, 1988; Nature, 461, 7265, 2009). Yet, common monolithic dielectrics, which are basic building ingredients …
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Explorations of domain walls and half quantum vortices in unconventional superconductors
… which may exibit spontaneously broken time reversal symmetry. Triplet superconductors have been proposed to host half quantum vortices, whereas superconductors with spontaneously broken time-reversal symmetry are proposed to admit domain walls that separate regions of opposing …
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Symmetry-protected topological phases and quantum anomalies
… states, based on examples in various spacetime dimensions. Through the study of the effect of interactions on these SPT phases, we discovered a new formalism of quantum anomalies, associated with discrete spacetime (such as time-reversal and spatial reflection) symmetries in particular, to …
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Two classes of unconventional photonic crystals
… of two dimensional photonic crystals that break time-reversal symmetry due to a magneto-optic effect. The band theory for such systems involves topological quantities known as "Chern numbers", which give rise to the phenomenon of disorder-immune one-way edge modes. I describe a system in which …
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