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 45 for “"coherences"”.
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Quantum beating of rubidium: Interference between atomic coherences and long range atom-atom interactions
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Interference between coherences established among the 5D5/2-5P3/2 and 5P3/2-5S1/2 energy levels within atomic rubidium
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Decoherence and Dephasing of Vibronic Excitons /
… on evolution of molecular excitation and quantum coherences. It is shown, that (i) quantum coherences of electronic, vibrational or mixed nature can be discriminated through the analysis of coherent oscillations in the two-dimensional spectrum, (ii) the effect of static energetic disorder on the …
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Vibroninių eksitonų išsifazavimas ir dekoherencija /
… on evolution of molecular excitation and quantum coherences. It is shown, that (i) quantum coherences of electronic, vibrational or mixed nature can be discriminated through the analysis of coherent oscillations in the two-dimensional spectrum, (ii) the effect of static energetic disorder on the …
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Coherent multi-exciton dynamics in semiconductor nanostructures via two-dimensional Fourier transform optical spectroscopy
… and holes, and their associated multiple-quantum coherences could reveal detailed information about complex many-body interactions and dynamics. However, unlike single-quantum coherences involving excitons, multiple-quantum coherences do not radiate and they have largely eluded direct observation …
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Theory of Charge and Heat Transport Mechanisms in Nanodevices
… a study of the role of so-called noise-induced coherences on the operation of a quantum absorption refrigerator. While in the past quantum coherences have usually been found to boost power in such setups, we observe a complete shutdown of the device when coherences survive to the nonequilibrium …
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Two-dimensional Spectroscopy of Molecular Excitons in a Model Dimer System
… strength, to provide clear signatures for coherences between vibronic excitons in 2D spectra. We begin by describing the design of a broadband passively phase-stabilized interferometer for collection of 2D spectra, which also allows for the investigation of state preparation in 2D …
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An Inverse Theory Approach to Incoherent Scatter Drift and Temperature Estimation at the Jicamarca Radio Observatory
… incoherent scatter theory to the realm of coherences. A very careful comparison between theoretical and measured spectra and theoretical and measured coherences has clearly established that the measured spectra and coherences are much narrower than those predicted by incoherent scatter …
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Investigation of DNP mechanisms : the solid effect
… transfer through many spin, high-order coherences. Previously, it was thought that transfers involving highorder coherences should be highly forbidden, whereas these experiments present strong evidence of their presence. Simulations using DNPsim also show that high-order coherences can …
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Quantum information processing in multi-spin systems
… closed-system limit. Entanglement and multi-spin coherences are essential for extending the control and the accessible information on the system. I employ entanglement in a large ensemble of spins in order to obtain an amplification of the small perturbation created by a single spin on the spin …
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The Search for New/Unknown Signals
… in solution: Intermolecular Multiple Quantum Coherences, or iMQCs, which can only be created by intermolecular dipolar couplings. Since the very beginnings of NMR, it has been known that dipolar couplings dominate the solid-state linewidth for spin-1/2 nuclei, but the effects are still not …
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ΕΠΙΔΡΑΣΗ ΑΝΟΜΟΙΟΜΟΡΦΗΣ ΑΝΑΔΡΑΣΗΣ ΣΤΟ ΟΠΤΙΚΟ ΠΕΔΙΟ ΑΝΙΧΝΕΥΤΗ
… IS CONCLUDED THAT THE STRUCTURE OF NEUTRON NOISE COHERENCES ATLOW FREQUENCIES CAN BE EXPLAINED BY EITHER PRESSURE OR/AND BOILING FEEDBACK.
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Quantum beat observations in rubidium vapor
… technique has resulted in observations of coherences within the atom that persist longer than 150 ps. Quantum beats due to the interference between the 7S and 5D_{5/2} energy states were observed by a four-wave mixing process. The difference frequency between the 5D–5P_{3/2} and the …
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Spin coherence and optical properties of alkali-metal atoms in solid parahydrogen
… where we studied transverse relaxation of Zeemancoherences in the ground hyperfine manifolds. We find that the transverse relaxation times vary over an order of magnitude across the alkali species. The longest measured transverse relaxation times are about four orders of magnitude shorter than …
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Urban segregation | clichy-sous-bois | paris
… and gives a short insight in the statistical coherences of crime and urbanism. after that, it takes a quick look at special housing examples in east-germany and vienna. it concludes with a summary and comparison of researched information and a possible proposal to improve the conditions in …
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Analysis and dynamic modelling of complex systems
… helps in achieving insights into the functional coherences of the system. To this end quantitative dynamic measurements are made. Then mathematical models are proposed and validated using this experimental data.
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Obtaining 1D dynamics in a quasi-1D NMR spin system
… the evolution and dynamics of multiple quantum coherences in a quasi-iD crystal lattice, Fluorapatite (FAp), through the use of NMR. In particular I focused on the system with chains aligned with the magnetic field axis, and with the so-called "magic angle" of 54.7°. In addition, I created a new …
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Stochastic modelling for the analysis of blowout risk in exploration drilling.
… physical causal mechanisms and deterministic coherences; and the decomposition of event sequences leading to blowout with subsequent syntheses. According to the objectives, an overall modelling framework has been established with key attributes focusing on the analysis and quantification of …
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Novel Gates with Superconducting Fluxonium Qubits
… errors may be reduced by both increasing qubit coherences and improving gate design. In this thesis, we develop the fluxonium qubit for superconducting quantum computing, a relatively newer qubit with advantages in qubit coherence. We first outline the design and simulation of these and other …
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Picosecond Time-Resolved Fluorescence Depletion Spectroscopy of Fluorene: IVR in the Excited Electronic State
… the effects of intermolecular rotational coherences on the time resolved fluorescence depletion decays of fluorene are explored. With these results we are able to confirm the assignments of the excited state B-values which we have made using rotational band contour simulations.
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