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 113 for “"initial condition"”.
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Hessian-based model reduction with applications to initial-condition inverse problems
… the problem of determining a reduced model of an initial value problem that spans all important initial conditions, and pose the task of determining appropriate training sets for reduced-basis construction as a sequence of optimization problems. We show that, under certain assumptions, these …
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Almost well-posedness of the full water wave equation on the finite stripe domain
… fluid flow are called Euler equations. If the initial fluid flow is prescribed at time zero, i.e., mathematically the initial condition for the Euler equations is given, the long-time existence of a unique solution for the Euler equations is still an open problem, even if the initial condition …
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Towards a spacetime description of hard parton evolution in the quark gluon plasma
… loss calcuations in AdS/CFT simulations use an initial condition of off-shell pairs of quarks placed back-to-back in the QGP, but a precise and theoretically motivated description of configuration does not exist. Quark virtuality can have noticeable effects on the rate of energy loss so a first …
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Phase space and path integral approaches to quantum dynamics
… exact quantum classical methods. Two different initial conditions are proposed. If the transients are important, we show that the so-called ""non-equilibrium"" initial condition can help us unify the fast timescales as well as the long timescale dynamics governed by the rate. On the other hand, …
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Application of an empirically-derived polytropic index for the solar wind to a solar wind shock propagation model
… a representative background solar wind as an initial condition. The original background solar wind is similar to the results obtained by Parker (Astrophysical Journal, 1958) and Weber and Davis (Astrophysical Journal, 1967). Changes to this initial condition are made by applying the …
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Near aggregation: a time and frequency domain analysis using state trajectories and transfer function residues
… order model such that, for an appropriate initial condition, the trajectories of the reduced-order model are linear combinations of the trajectories of the ful 1-order model. We study systems which do not aggregate exactly, but which "nearly aggregate". It is shown that for "nearly …
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The effects of distraction on amount of food consumed, food preference, and satiety
… (DIS, n=55) or non-distracted (NON, n=65) test condition. In both conditions, participants were provided with miniature quiche. In DIS, participants consumed quiche while playing a Rapid Visual Information Processing (RVIP) task. In NON, participants ate without any distraction. Plates were …
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STOCHASTIC FUNCTIONAL DIFFERENTIAL EQUATIONS DRIVEN BY FRACTIONAL BROWNIAN MOTION AND THEIR GENERALIZATIONS
… the dependence of the solution on the initial condition and the existence of finite moments of the solution. Furthermore we generalize these results to wider classes of stochastic differential equations. The stochastic integral with respect to fractional Brownian motion is defined as a …
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Well-Posedness Threshold and Moment Asymptotics of the Parabolic Anderson Model on Riemannian Manifolds
… on the paper \cite{CO25}. Here, we allow the initial condition to be a finite measure, and focus on obtaining the sharp regularity requirement (what is known as Dalang's condition in SPDE literature) on the noise in order for the equation to be well-posed. The highlight of this part is that …
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Mixed Control Moment Gyro and Momentum Wheel Attitude Control Strategies
… and the momentum wheels to reject tracking and initial condition errors. Numerical simulations of derived control laws are compared. A trend analysis is performed to examine the benefits of the derived controllers. We describe the design of a CMG built using commercial off-the-shelf (COTS) …
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The Effect of Music on Impulsivity in College Undergraduate Students with Attention Deficits
… a computer task (CPT) to complete in an initial condition, a music condition, and a silence condition. One group of participants had no diagnosed history of ADHD while the other participant group had a history of ADHD. The initial condition served as an opportunity for each participant to …
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Chaos and Dynamical Systems
… systems that vary greatly with respect to initial conditions. The slightest change in an initial condition, a seemingly unnoticeable change, can yield a drastically different result if the system is chaotic. Hence the common term relating to chaos theory, "the butterfly effect". Something …
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Real-time Personalized Tolling with Long-term Objectives
… are challenging due to endogeneity known as the initial condition problem. We begin by proposing a Control Function solution under a general setting, which is shown to improve a commonly used solution by Wooldridge. Then, through applying the developed solutions to empirical data, we discovered …
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One dimensional pollutant transport model
… the liner permeability, the ponding head and the initial condition of the porous domain on the spread of the contaminant is studied. Conclusions are presented based on a parametric study.
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Invertibility and observability of switched systems with inputs and outputs
… dynamical system are uniquely defined once the initial condition and the input are fixed. Broadly speaking, if the output is assumed to be known, the problems considered in our work deal with: (a)~the reconstruction of the input when the initial state is known, or (b)~the recovery of the initial …
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NABLA Fractional Calculus and Its Application in Analyzing Tumor Growth of Cancer
… nabla fractional difference equation with an initial condition. In chapter three, we define a lower and an upper solution for up to the first order nabla fractional difference equation with an initial condition. Under certain assumptions we prove that a lower solution stays less than an upper …
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Emergence and stability of complex structures from stochastic neuronal networks
… that the model shows a robust phenomenon to the initial condition, but not to the input stimulus, which implies the importance of the initial condition and the noisy inputs. These dynamics may explain learning and reinforcement of the visual neurons and could predict results in future experiments.
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On stability and controllability of conjunctive Boolean networks
… trajectory, with the perturbed state being the initial condition, will enter another (possibly the same) periodic orbit in finite time steps. We then provide a complete characterization of all such transitions from one periodic orbit to another. In particular, we construct a digraph, with the …
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Asymptotic Analysis of Perturbations to Travelling Wave Solutions of Nonlinear Advection-Reaction-Diffusion Equations of Fisher Type
… solutions are perturbed. First we perturb the initial condition and then derive approximate expressions for the perturbations. The goal of the thesis is to investigate the case where the constant speed of the background medium is perturbed by a small-amplitude spatially and temporally localized …
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The evolution of 'Boxes' to quantized inductive learning: a study in inductive learning
… which moves the system from an arbitrary initial condition to equilibrium or rejects a sinusoidal disturbance. In both cases, the control is learned in absence of an a priori system model.
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