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 27 for “"Dynamical effects"”.
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Dynamical effects in pionic atoms
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1984
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Dynamical effects in crystalline solid state systems: theory of temperature dependent optical response of bulk gaAs and vibrational modification of C(111) 2 x 1 Surface in Comparison to Experiment
… a new theoretical formalism which incorporates dynamical effects in atomistic electronic structure and related calculations. This research, fundamental by nature, brings about a deeper understanding of the dynamical processes in a range of materials. This establishes technologically important …
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Adaptive Control for a Class of Nonlinear, Time Varying Rotational Systems
… performance. Because of these often unknown dynamical effects in aerospace systems, an emphasis is placed on controller robustness as significant safety risks are present. Due to the difficulty of predicting uncertainties, robust control can be achieved in two distinct ways. The first …
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Dynamical tuning of phonon transport for information and energy control
… and turn phonons into information carriers. Dynamical effects are a crucial and under-examined aspect of this control as static devices are insufficient for changing external conditions. Dynamical control adds flexibility and versatility to phononic systems. Essentially, dynamical control …
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Quantum Mechanical/molecular Mechanical Studies of F(1)-Atpase and a Plant Photoreceptor
… changes in Phot-LOV1 which suggests that dynamical effects mediate signal transmission following the initial photoexcitation event.
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Electroweak Calculations In The Presence Of Nonperturbative Qcd Effects
… is calculated, leading to a gauge independent dynamical component for the quark mass.;Insertion of this nonperturbative order parameter into lowest-order electroweak quark self-energies is shown to satisfy on-mass-shell gauge parameter independence only if there is no contribution from the …
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Ab initio calculations of NMR chemical shifts for structure determination in biology
… to the chemical shifts, such as solvent and dynamical effects, is demonstrated by testing our computational method on proteins and by comparing theory and experiment. The thermal effects on the chemical shift in the solid are studied by combinig ab initio molecular dynamics simulations and …
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Adaptive Control for Nonlinear, Time Varying Systems
… of both internal and external disturbances and dynamical effects.</p>
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High Pressure Nmr Studies of the Dynamic Structure of Liquids
… In these models it is proposed that there are dynamical effects on isomerization because the reaction coordinate is coupled to the surrounding medium. This leads to the dependence of the transmission coefficient upon the collision frequency, which in the absence of electrostatic effects …
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Landau Model for Films and Interfaces of Superfluid Helium-4 at T = 0k
… at temperature T = 0 to describe structural and dynamical effects at a gas/superfluid interface and for a superfluid film on an inert attractive substrate. The parameters of the theory are determined phenomenologically by fitting measured bulk properties of the homogeneous superfluid. The theory …
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Landau model for films and interfaces of superfluid 4HE at T=OK
… at temperature T = 0 to describe structural and dynamical effects at a gas/superfluid interface and for a superfluid film on an inert attractive substrate. The parameters of the theory are determined phenomenologically by fitting measured bulk properties of the homogeneous superfluid. The theory …
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Bloch-oscillating Electrons in Moiré Superlattices
… number of carriers enables various exciting effects, e.g., a comb-like spectrum of emitted electric noise with resonances near the Bloch frequencies and a strong response under an AC field near these frequencies. Furthermore, moiré systems present an appealing opportunity for achieving …
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Attitude control via structural vibration : an application of compliant robotics
… requisite cyclic shape change is attainable via dynamical effects, such as the normal modes of structural vibration for structures with finite stiffness. This is the central novel result of this thesis and has implications for the design of space structures where the attitude control hardware is …
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Nonlinear Dynamics of solitary and optically-injected spin vertical-cavity lasers
… of the various polarised resolved nonlinear dynamical effects in solitary and injected 1300 nm spin-V(E)CSELs. We report a comprehensive study including theory, based on the Spin Flip Model, and experiments of the stability characteristics of solitary 1300 nm dilute nitride Quantum-Well (QW) …
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The Effects of Diabatic Heating on Storm Track Dynamics
The dynamical effects of diabatic heating in Northern Hemisphere winter storm tracks are studied in the context of a nonlinear primitive equation model with vertical and horizontal resolution adequate to capture shallow, short wavelength baroclinic waves. The model is forced by realistic orography …
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Stability Limits of Uncertain Systems in the Presence of Unmatched Coupled Dynamics and Actuator Dynamics with Adaptive Architectures
… applicable. Additionally, we investigate the effects of incorporating a low-pass filter to mitigate high-frequency oscillations that can arise from the large MRAC update rates that are required for faster convergence. Furthermore within the modified hedged- and modified expanded reference …
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Characterizing sub-mm observations of protoplanetary disks at super-resolution scales
… and continued growth in debris disks to their dynamical evolution in exoplanetary systems and ultimate accretion onto white dwarfs. Measurements in each of these eras can be used to inform study in the others. Interferometry affords the highest angular resolution of any observing technique in …
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Density-Functional Theory+Dynamical Mean-Field Theory Study of the Magnetic Properties of Transition-Metal Nanostructures
… this thesis, Density Functional Theory (DFT) and Dynamical Mean-Field Theory (DMFT) approaches are applied to study the magnetic properties of transition metal nanosystems of different sizes and compositions. In particular, in order to take into account dynamical electron correlation effects …
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The origin and evolution of warm exozodiacal dust
… be highly stochastic, depending on the sizes and dynamical lifetimes of comets scattered in. The comet fragmentation model is then extended to be applicable to other planetary systems, taking into account the different dynamical effects. This model will show how much dust comets produce and its …
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