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 117 for “"Exponential decay"”.
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Exponential Decay for the Saint-Venant Principle
We consider a semi-infinite beam B = {(z,t)(VBAR)z(ELEM)(OMEGA), t (GREATERTHEQ) 0} where (OMEGA) is a bounded domain in (//R)('2) with the cone property and a C('3)-smooth boundary. By applying semigroup theory and spectral theory, we show that in our formulation Saint-Venant's principle is true …
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Control and stabilization of kdv-kdv and kp type systems
… mechanisms and delay terms, demonstrating the exponential decay of the energy associated with the system, given small initial data. For this purpose, we use the Lyapunov method and fixed-point arguments. In the context of the KP equation, we explore the critical length phenomenon, deriving …
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Exploring possible coupling between phonons and internal nuclear states
… Another example involves unexpected non-exponential decay of radioactive sources. These anomalies have motivated a research effort by my Ph.D. advisor at MIT, Professor Peter Hagelstein, to investigate the physical phenomena involved. Hagelstein came up with a theory predicting coupling …
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Contributions to mixing and hypocoercivity in kinetic models
… nonlinear stability results with algebraic and exponential decay. Moreover, I show how the mean-field estimate by Dobrushin can be improved around the incoherent state. In addition, I study how a kinetic system can reach a thermal equilibrium. This is modelled by adding a dissipative term, which …
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Parallel repetition of multi-party and quantum games via anchoring and fortification
… and multi-player games by establishing the first exponential-rate hardness amplification results for these games and hence extend the classes of games where exponential decay rates is known considerably. We consider two different methods for obtaining these hardness amplification results. For our …
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A control problem for Burgers' equation
… location of sensors are obtained. Also, explicit exponential decay rates for open-loop and closed-loop systems are obtained. Numerical experiments are given to illustrate some of typical results on convergence and stability.
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Dynamic study of factors impacting on combat power
… of the entity, virtually eliminating the exponential decay function presently in use. Keywords: Inherent power. (Theses)
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Jost Functions for Jacobi Operators with Super-exponentially Decaying Parameters
The decay of the parameters for a Jacobi operator is related to the analyticity of the Jost function associated with J, which is in turn related to the spectral measure of J. Damanik and Simon demonstrated the equivalence between the exponential decay of these parameters and the analyticity of the …
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Applications of noise theory to plasma fluctuations
… The spatial correlations are modeled by the exponential decay. Based on these models, the correlation function and the power spectral density of random fluctuations. We also find that the fluctuation-induced transport coefficients may be estimated by the correlation length and the correlation …
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Asymptotic spectral analysis and tunnelling for a class of difference operators
… are geodesics and d gives the rate for the exponential decay of Dirichlet eigenfunctions. In terms of this distance, we give sharp estimates for the interaction between the wells and construct the interaction matrix.
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Degradation of NiTi springs through electronic actuation
… lifetime of 10.000 cycles. Results showed exponential decay with a maximum 6\% force degradation over 10.000 iterations.
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Spatial Decay of Rotating Waves and Restrictions on Finite Disks.
… The focus is to concentrate on solutions which decay at infinity. Under suitable assumptions, we prove the solution and its derivatives decay exponentially in all space. We also attempt to show that the solution decays exponentially for the system of equations when posed on a finite disk. This …
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Control Theoretic Methods In Analysis And Design Of Optimization Algorithms
… programming framework able to certify both exponential and subexponential convergence rates for a wide range of algorithms. We illustrate the utility of our results by analyzing the gradient method, proximal algorithms and their accelerated variants for (strongly) convex problems. We also …
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Decay for quasilinear wave equations on cosmological black hole backgrounds
This thesis studies the decay and stability of linear and quasilinear wave equations of Schwarzschild--de~Sitter $(M,\Lambda)$ and Kerr de Sitter $(a,M,\Lambda)$ black hole backgrounds, where $a,M,\Lambda$ are respectively the rotation parameter of the black hole, the mass of the black hole and the …
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Time resolved fluorescence of CdSe nanocrystals using single molecule spectroscopy
… edge fluorescence 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 …
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Structural, magnetic, and optical properties of orthoferrite thin films
… found that increasing oxygen pressure caused exponential decay in the deposition rate. Most films were amorphous, exhibiting a paramagnetic M-H plot and a Verdet coefficient between 0.37 and 0.89 deg cm-1 Gauss-1
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ADIABATIC CONDITIONS FOR FINANCIAL SYSTEMS
… smile and we study the relation between the decay of its tails and the fitting parameters of the smile. We show that, considering a scaling law derived from data, it is possible to get a new fitting procedure of the volatility smile that considers also the exponential decay of the real PDF of …
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Thermostated Kac models
… addition, with a thermostat. When m = N, we show exponential approach to the equilibrium canonical distribution in terms of the L2 norm, in relative entropy, and in the Gabetta-Toscani-Wennberg (GTW) metric, at a rate independent of N. When m < N , the exponential rate of approach to equilibrium …
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Synthesis and Characterization of Titanium Zirconium Based Alloys for Capacitor Use
… examined. Long term creep rate change was fit to exponential decay with a time constant of 7.9x103s.
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EXOTIC PHASES IN A SPIN-1 BOSONIC FLUX SYSTEM
… characterised by a charge gap and a periodic exponential decay of the Green’s functions. However, surprisingly, the connected density-density correlation functions decay with a power law and neutral excitations are gapless. When the hopping strength is sufficiently large or at non-commensurate …
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