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 24 for “"Energy redistribution"”.
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Energy Redistribution with Controllable Binary State Latch Element
… with proper real-time control algorithm for energy redistribution application is introduced in this thesis. Unlike traditional tuned vibration absorber, the latch device can be viewed as variable semi-active dampers such as magnetorheological (MR) and piezoelectric friction dampers. The …
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Mechanisms of Intramolecular Vibrational Energy Redistribution and a Method for Coherent Control
Finally, a method for coherent control of reaction dynamics in large molecules is presented, in which IVR is dramatically slowed through the used of laser pulses that are easily produced with available pulse shaping equipment.
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Retrieval of atmospheric properties of extrasolar planets
… radiative transfer, hydrostatic equilibrium, and energy balance, along with prescriptions for non-equilibrium molecular composition and energy redistribution. The major difference from traditional 1-D radiative transfer models is the parametric P-T profile, which essentially means adopting energy …
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Molekulare Dissoziation im elektronischen Grundzustand induziert durch Femtosekundenpulse im mittleren Infrarot
… excitation levels (v=7-8) provides the necessary energy for bond scission. This excitation scheme was demonstrated with metal carbonyls and diazomethane. Only ultrashort laser pulses allow for excitation and subsequent reaction on a time scale faster than the statistical energy redistribution …
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Ultrafast dynamics in complex molecular solids: Ultrafast imaging of laser ablation of PMMA and theory of mechanical energy flow in ultrahot crystalline naphthalene
… solid, there is an ultrafast transfer of energy between the internal molecular vibrations and the external modes or lattice vibrations. Two interesting examples involving this energy transfer are presented in this thesis. First, an ultrafast imaging apparatus is constructed and used to …
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Remaining Unperturbed by the Vibrational Response: Probing Vibrational Coupling, Relaxation, and Solvent Effects with 2D IR Spectroscopy
… enables the analysis of vibrational couplings, energy redistribution pathways, and solvation dynamics in real time. The early chapters of this dissertation will provide a semi-rigorous introduction to nonlinearresponse theory and explore newly developed models to more accurately capture the …
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Spectral Energy Dynamics and Wavevector Resonance in a Weakly Nonlinear Chaotic Elastodynamic Billiard
… waves within an elastic body leads to spectral energy redistribution. The coupling strength can exhibit a sharp increase as a function of frequency due to wavevector coincidences between constituent waves of different wave types. The phenomenon is investigated for an ensemble of weakly nonlinear …
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Global and Local Models for Dilution Factors: Theory and Stimulated Emission Pumping Experiments
… is a measure of the intramolecular vibrational energy redistribution (IVR) an excited state undergoes. The distribution of dilution factors for a single molecule (SCCl2) was examined. Stimulated emission pumping (SEP) experiments were performed on SCCl2, probing the 7000--8,000 cm-1 range on the …
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The Effects Of Noncovalent Interactions Studied By Ultrafast Two-Dimensional Infrared Spectroscopy
… anharmonicities, and intramolecular vibrational energy redistribution (IVR) of these different types of systems by applying ultrafast two-dimensional infrared (2DIR) spectroscopy and ultrafast polarization dependent mid-IR pump-probe spectroscopy. Bis(cyclopentadienyl ruthenium dicarbonyl) dimer …
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Basic dynamics of low-frequency variability and the storm tracks
… waves which jointly give rise to a maximum local energy downstream of the jet core. Its growth rate diminishes very rapidly as the constant part of the basic zonal wind is increased, but is not sensitive to the zonally averaged part of the shear flow. The non-modal analysis shows the excitation of …
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Numerical Study of Metamaterial-Inspired Water Wave Control Technologies
… serve as both a coastal hazard and a renewable energy resource. On one hand, they drive erosion and flooding, posing significant risks to coastal communities. On the other, they offer a vast but largely untapped source of sustainable energy. Addressing these challenges requires innovative …
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PRINCESS AND THE PEA: THE IMPACT OF ROUGH TOPOGRAPHY ON DYNAMICS OF LARGE-SCALE SURFACE CIRCULATION PATTERNS
… role in the climate regulation of the Earth by redistribution of heat, nutrients and momentum across five basins. Large-scale gyres in these basins are driven by wind stress and planetary rotation. However, the interaction between these forces and unresolved bottom topography is poorly …
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On quantum vortex reconnections
… values of the inclination angle, as well as the redistribution of total energy among its components during the reconnection process. By applying the Helmholtz decomposition of the kinetic energy, we further characterize how the inclination angle affects the partition between incompressible and …
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Investigations of intramolecular dynamics by picosecond time-resolved spectroscopy
Intramolecular vibrational energy redistribution (IVR) is studied by picosecond time resolved fluorescence depletion (TRFD), a technique which directly measures the ultrafast relaxation processes of the initially prepared vibronic level. Fluorescence depletion decays and dispersed fluorescence …
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A Multi-Region Multi-Timescale Burning Plasma Dynamics Model for Tokamaks
… alpha particles, which first transfer their energy to core electrons. The heated electrons and remaining fusion alpha particles then heat core ions through Coulomb collisions, which can increase the fusion reaction rate and may conceivably lead to a thermal runaway instability. Meanwhile, …
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Dynamic Studies of Instability-Triggered Intersonic Surface Detachment Waves in Soft Material Sliding
… bifurcation instabilities and regulated by energy redistribution. Among them, elastomeric materials sliding on smooth surfaces generate separation pulses due to tangential stress gradients. When the material slides at a speed much lower than those of elastic surface waves, the process is …
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Observation and Nature of Non-statistical Dynamic Effects in Ordinary Organic Reactions
… primary ozonide and intramolecular vibrational energy redistribution. A recent theoretical study from our group predicted that a highly asynchronous organocatalytic Diels-Alder (DA) reaction, which is concerted in the potential energy surface, is stepwise in the free energy surface. Kinetic …
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Sampling Methods in Ray-Based Global Illumination
… course of sampling. The first of these methods, energy redistribution path tracing, works by using path mutation to spread energy, and thus share sampling information, between pixels. The second method, sample swarming, shares information gained during sampling by keeping importance maps for each …
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Coupled Field Modeling of Gas Tungsten Arc Welding
… The model incorporates the effects of thermal energy redistribution through weld pool dynamics into the structural behavior calculations. Through material modeling the effects of microstructure change/phase transformation are indirectly included in the model. The developed weld pool dynamics …
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Observations, Thermochemical Calculations, and Modeling of Exoplanetary Atmospheres
… and put a nominal upper limit on the day-night energy redistribution. Chapter 4 presents an open-source Thermochemical Equilibrium Abundances (TEA) code and its application to several hot-Jupiter temperature and pressure models. TEA calculates the abundances of gaseous molecular species using …
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