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 73 for “"Relaxation dynamics"”.
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Relaxation dynamics in heme proteins
… to give rise to a multitude of nonequilibrium relaxation phenomena. H the temperature is lowered, transitions between substates of higher tiers are frozen out, and relaxation processes characteristic of lower tiers will dominate the observational time scale. This thesis addresses the following …
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Relaxation dynamics in heme proteins
… to give rise to a multitude of nonequilibrium relaxation phenomena. If the temperature is lowered, transitions between substates of higher tiers are frozen out, and relaxation processes characteristic of lower tiers will dominate the observational time scale.
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Relaxation Dynamics of Photoexcited Carriers in Graphene
… let alone studies specifically looking at charge dynamics of photo-excited carriers in graphene. So in the third chapter, a homebuilt near-infrared pump and mid-infrared probe spectroscopy system is described which is designed to have a high temporal resolution to study photo-excited carriers in …
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On the Relaxation Dynamics of Disordered Systems
… during their creation, leading to evolutionary dynamics and thus population-level optimization. We derive an effective subspecies mean-field theory and compare its results to our numerical data. Furthermore, we introduce environmental variability via quenched spatial reaction-rate randomness. We …
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Non-Equilibrium Relaxation Dynamics in Disordered Superconductors and Semiconductors
We investigate the relaxation properties of two distinct systems: magnetic vortex lines in disordered type-II superconductors and charge carriers in the Coulomb glass in disordered semiconductors. We utilize an elastic line model to simulate magnetic flux lines in disordered type-II superconductors …
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Pattern formations and relaxation dynamics in non-equilibrium systems
… we show that the non-trivial in-domain dynamics affect the coarsening process and the interfacial properties. The exponents which govern domain growth, aging, and interface fluctuations differ from those expected from curvature driven coarsening. The response to perturbations of the …
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Power Dependent Study of CDSE-ZNS Quantum Dot Relaxation Dynamics by 2D Muppets
<p>CdSe-ZnS core-shell quantum dot relaxation dynamics are multiexponential and have a strong power dependence. Because single exciton and biexciton populations, are indistinguishable by any-dimensional experiments, there is uncertainty as to whether this power dependence comes from a biexciton or …
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Optical study of shear and longitudinal acoustic waves and complex relaxation dynamics of glass forming liquids
… refined and used to study the complex structural relaxation dynamics of glass forming liquids, allowing both empirical modeling and testing of the predictions of the mode-coupling theory (MCT). Longitudinal and shear acoustic waves throughout much of the MHz frequency range, time-dependent thermal …
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Relaxation dynamics in borate glass formers probed by photon correlation at the microscopic and macroscopic length scale
X-ray photon correlation is used to probe the dynamics of the strong glass former boron trioxide and of a series of alkali borate glasses, (M2O)x(B2O3)1-x where M is the alkali modifier (M=Li, Na and K). The decay times τ of the obtained correlation functions in B2O3 are consistent with visible …
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Improved models of colloidal gels : kinetic arrest relaxation dynamics, structural breakdown and the role of hydrodynamic interactions
… arrest of attractive dispersions. The collective dynamics enabled by fluid mechanics are shown to enhance coagulation leading to a shift in the gel boundary to lower strengths of attraction and lower particle concentrations when compared to models that neglect hydrodynamic forces. Simulations with …
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Spin and Carrier Relaxation Dynamics in InAsP Ternary Alloys, the Spin-orbit-split Hole Bands in Ferromagnetic InMnSb and InMnAs, and Reflectrometry Measurements of Valent Doped Barium Titanate
… requires extensive knowledge of carrier and spin dynamics. Thus, I have performed time and polarization resolved pump-probe spectroscopy on InAsP with various compositions. The carrier and spin relaxation time in these structures were observed and demonstrated tunability to the excitation …
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Ultraschnelle optoelektronische und Materialeigenschaften von Stickstoff-haltigem GaAs
… is investigated. The second part focuses on the relaxation dynamics of highly excited carriers. For this, the carrier relaxation dynamics in nitrogen implanted GaAs, in epitaxially grown GaAsN and in (pure) GaAs are investigated by means of pump probe measurements on a femtosecond time scale. The …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… used to investigate the ultrafast excited-state relaxation dynamics of the different dyes adsorbed on the core-shell-shell surface and the size-dependent dynamics o interfacial charge transfer between the gold nanoclusters and the TiO2 bandgap in TiO2-Au nanocomposites. In the second part of this …
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Time Resolved Spectroscopy in InAs and InSb based Narrow-Gap Semiconductors
… frequencies, it is crucial to probe carrier dynamics in semiconductors on femtosecond timescales. Time resolved spectroscopy is an excellent tool to probe the relaxation dynamics of photoexcited carriers; where after the initial photoexcitation, the nonequilibrium population of electrons and …
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A space focused ion time of flight mass spectrometer, and spectroscopy of hydrogen chloride, deuterium chloride, and hydrogen sulfide at "hard" x-ray energies
… mass spectrometer was used to study the relaxation dynamics of HCl, DCl, and H{dollar}\sb2{dollar}S following the excitation of a K-shell electron using synchrotron radiation. On resonance, fragmentation of the molecule involving neutral dissociation of hydrogen was found to be a …
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Direct and inverse turbulent cascades in a 2D Bose gas
This thesis explores the dynamics of two-dimensional (2D) Bose gases driven far from equilibrium, as well as their subsequent relaxation dynamics, and can be divided into two sections. The first one provides the background for the novel work of the second part, which describes three experimental …
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Mechanics of Composite Hydrogels
… particles; (ii) linear viscoelastic stress relaxation in composite hydrogels, as a manifestation of athermal relaxation dynamics; (iii) nonlinear compression stiffening in composite hydrogels, arising from complex particle dynamics that arise during compression; and (iv) design methods for …
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Triplet exciton dynamics in conjugated polymer films
A thorough knowledge of the excited state dynamics in conjugated polymers is necessary for efficient use of these novel materials. Triplet excitons are believed to play an important role in conjugated polymer-based device operation. Triplet excitons are also believed to play a primary role in …
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Time resolved fluorescence of CdSe nanocrystals using single molecule spectroscopy
… from single NCs reveal multiexponential relaxation dynamics that stem from fluctuations of non-radiative decay rates for the band edge exciton. Analysis of these fluctuations allows us to extract single exponential dynamics by sampling only "maximum-intensity" photons, and we find that …
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Statistical Electron Microscopy, Rheometric Studies of Carbon Nanotube Solutions in Chlorosulfonic Acid and Characterization of Wire, Planar Antennas Manufactured from Macroscopic Carbon Nanotube Materials
… fluid phase is presented, with an emphasis on relaxation dynamics of the CNT network and liquid crystalline phase. Finally, wire and planar antennas manufactured from fiber spinning and shear-coating of these CNT solutions are designed and their performance is shown to match that of equivalent …
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