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 548 for “"Initial conditions"”.
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Toward initial conditions of conserved charges
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Initial Conditions and Collapse of Prestellar Cores
… the turbulent flow. This mechanism creates the initial conditions for the formation of stellar objects. Due to the stochastic nature of turbulent velocity fields every prestellar core is unique in its shape and internal dynamics. This pecularity in the initial conditions is transformed via the …
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Probing the Cosmological Initial Conditions Using the CMB
Finally, using our estimator we found (Yadav and Wandelt 2008) evidence for primordial non-Gaussianity of the local type (fNL) in the temperature anisotropy of the Cosmic Microwave Background. Analyzing the bispectrum of the WMAP 3-year data up to lmax=750 we find 27< fNL<147 (95% CL). This amounts …
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Analysis of energy flow in controlled structures subject to initial conditions
… structures. If the goal of control is to stop an initially vibrating structure, energy must be forced out through dissipating components. The analysis performed here quantifies energy being transferred internally and externally to dissipative mechanisms in the primitives of a spring-mass-damper …
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The Effect of Initial Conditions on the Weather Research and Forecasting Model
… (WRF). This model takes input from data files as initial conditions, often from other models, and runs a simulation based on its own set of equations and conditions.</p>
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Conformal Field Theory Descriptions of String Initial Conditions and Quantum Entanglement Entropy
Quantum theories are filled with predictions which defy any classical analog. Perhaps the phenomenon which is most bizarre from a classical perspective is entanglement. This effect is the driving force behind the growing interest in quantum information. From entanglement, one is naturally led to …
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Initial Conditions for Cosmic Inflation, the History of the Dark Sector, and Dark-Onium
… whether inflation is robust to inhomogeneous initial conditions. This thesis first describes the basics of cosmic inflation and the evolution of primordial inhomogeneities in the matter field and spacetime metric during inflation. Then a new approach for analyzing the onset of inflation amid …
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Modeling dispersions in initial conditions for air-launched rockets and their effect on vehicle performance
… results of 1000 Monte Carlo runs with various initial conditions produce a statistical representation of the expected dispersions in vehicle state at ignition. A 6-DOF Simulink simulation of the rocket's first stage bum is used to quantify the vehicle's performance. The simulation is run for a …
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Mild solutions of SPDE's driven by Poisson noise in infinite dimensions and their dependence on initial conditions
… is directed towards their regularity w.r.t. the initial datum g. Under Lipschitz assumptions on the drift and the diffusion we show that for every initial condition g, which is a p-integrable random variable, there exists a unique mild solution in the space of predictable p-integrable processes, …
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Constraining the Initial Conditions and Final Outcomes of Accretion Processes around Young Stars and Supermassive Black Holes
In this thesis I discuss probes of small spatial scales around young stars and protostars and around the supermassive black hole at the galactic center. I begin by describing adaptive optics-fed infrared spectroscopic studies of nascent and newborn binary systems. Binary star formation is a …
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Overcoming unrealistic behavior of landscape evolution models attributed to the stream power incision model: Scale invariance and ultra-sensitivity to initial conditions
… mountain formation and landform development. Initially these models were conceptual ideas of how geomorphic processes create the landscapes we see today. Now, we predominantly use numerical models of landscape evolution to investigate how large-scale landforms behave over long timescales. …
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Primordial evolution of cosmological perturbations: Theory and computation
… large-scale structure, therefore modelling their initial conditions and evolution is key to understanding how structure forms. Recent tensions in the inferred values of cosmological parameters have raised interest in models that deviate from the currently accepted standard model of cosmology, the …
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Krylov Subspace Spectral Methods with Non-homogenous Boundary Conditions
… heat equation with non-homogenous boundary conditions. While current methods such as Finite Difference are able to carry out these computations efficiently, their accuracy and scalability can be improved. We will solve the heat equation in one-dimension with two cases to observe the …
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TOURNAMENT-WINNING STRATEGY FOR ITERATED OPTIONAL PRISONER'S DILEMMA
… strategies for IOPD tournaments in a variety of initial conditions. Machine learning techniques are used to iteratively improve upon the winning strategy, culminating in a single undefeated strategy. The outcome of this study is a single strategy that we claim is likely to win an IOPD tournament …
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An analytic investigation for solutions of flow properties inside the shock layer of a supersonic flow past a circular cylinder
… properties along the stagnation streamline as initial conditions. However, the method can still be classified as one of the direct type. A potential flow solution along the stagnation streamline is used to approximate the initial conditions. The results are compared with existing solutions and …
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River network scaling: optimality and anisotropy
… of this model show that scaling depends on initial conditions. Perturbations over time would also affect the scaling of this model. Based on these results, I argue that initial conditions and perturbations, together with dynamics, provide a more promising direction than optimality for …
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Estimating open-ocean boundary conditions : sensitivity studies
The problem of estimating boundary and initial conditions for a regional open-ocean model is addressed here. With the objective of mimicking the SYNOP experiment in the Gulf Stream system, a meandering jet is modeled by the fully nonlinear barotropic vorticity equation. Simulated observations of …
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