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.
Results
Showing 1 to 20 of 380 for “"truncation"”.
-
Truncation in differential Hahn fields
Being closed under truncation for subsets of generalized series fields is a robust property in the sense that it is preserved under various algebraic and transcendental extension procedures. Nevertheless, in Chapter 4 of this dissertation we show that generalized series fields with truncation as an …
-
Moment Matching and Modal Truncation for Linear Systems
… yields an intelligent choice for the mode of truncation. The dual-stage algorithm disappoints in the context of highly nonnormal semi-discrete convection-diffusion equations. There, moment matching can be ineffective in dimension reduction, precluding a cost-effective modal filtering step.
-
A gauge-invariant, symmetry-preserving truncation of JIMWLK
… with matrices of Wilson-line correlators. This truncation is realized by parameterizing the energy-dependence of the symmetric and anti- symmetric parts of these matrices independently via energy-evolution operators which evolve ini- tial conditions in a manner akin to the time-evolution of …
-
Phase truncation effects in direct digital frequency synthesis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
-
Truncation Models for Pareto and Exponential Distributions with Applications
The theme of this work is truncation. We revisit the truncated Pareto(TP) distribution, which is a useful power-law stochastic model for positive data that are subjected to truncation. We extend the standard TP model in the literature, where the main shape parameter α is assumed to be positive, to …
-
A Comparison for Longitudinal Data Missing Due to Truncation
Many longitudinal clinical studies suffer from patient dropout. Often the dropout is nonignorable and the missing mechanism needs to be incorporated in the analysis. The methods handling missing data make various assumptions about the missing mechanism, and their utility in practice depends on …
-
Investigating the 4-point truncation of the JIMWLK evolution equation
… for Nc. Since this involves an infinite sum, truncation at some order p is necessary. While 2- and 3-point truncations have been studied extensively, this thesis extends the framework to 4-point truncations to capture the physics of 4-point Wilson line correlators. We first refine the …
-
Variances of some truncated distributions for various points of truncation
… variance for nested increasing intervals of truncation in the case of univariate distributions., The Monte Carlo procedure is used to determine a table of standard deviations for the standard normal distribution with the same points of truncation reported by Clark(2). Clark's table is given …
-
Rapidity evolution of observables at high energies using the Gaussian truncation
… are impossible to solve in a closed form and truncations become necessary. The most common truncation relies on the large Nc limit, which is relatively crude and subtly breaks gauge invariance. To get around this, we can perform a gauge invariant truncation of this hierarchy in the form of the …
-
Truncation Error Based Mesh Adaptation and its Application to Multi-Mesh CFD
… the mesh adaptation processes are driven by the truncation error, which is the local source of the discretization error. Because this work is focused on methods for structured grids, r-adaptation is used as opposed to h-adaptation. A new method for performing the r-adaptation based on an …
-
Lower bounds to eigenvalues by the method of arbitrary choice without truncation
After a detailed discussion of the variation theorem for upper bound calculation of eigenvalues, many standard procedures for determining lower bounds to eigenvalues are presented with chemical applications in mind. A new lower bound method, arbitrary choice without trunctation is presented and …
-
Imputation of data missing due to truncation: Maximum likelihood estimates using symmetry property.
Imputation of data missing due to truncation: Maximum likelihood estimates using symmetry property.
-
Biomechanical Golf Swing Analysis using Markerless Three-Dimensional Skeletal Tracking through Truncation-Robust Heatmaps
The efficient generation and transfer of energy in the golf swing has long been a subject of biomechanical interest, with a particular focus on the concept of the kinematic sequence, which is the coordinated segmental rotation of the pelvis, torso, arms, and club. While previous studies have …
-
Effect of modal truncation on derivatives of closed-loop damping ratios in structural control
It is well known that Fourier series of discontinuous functions converge slowly and that the derivatives of the series may not converge at all. Since modal expansion of structural response is a generalization of the Fourier series, slow convergence of modal expansion can be expected when the …
-
The best truncation point for the estimated spectral density function of a stationary time series
… estimator. For this type of estimator, a truncation point can be chosen which yields a minimum mean square estimator among all truncated estimators. In this study we are concerned with two problems; i) finding consistent estimators of the spectral density function, and ii) determining the …
-
Application of Improved Truncation Error Estimation Techniques to Adjoint Based Error Estimation and Grid Adaptation
… error, which is locally generated by truncation error. The discretization error is extremely difficult to properly estimate and this in turn leads to uncertainty over the quality of the numerical solutions obtained via CFD methods and the engineering functionals computed using these …
-
On the Tightness of the Balanced Truncation Error Bound with an Application to Arrowhead Systems
Balanced truncation model reduction for linear systems yields reduced-order models that satisfy a well-known error bound in terms of a system's Hankel singular values. This bound is known to hold with equality under certain conditions, such as when the full-order system is state-space symmetric. In …
-
Efficient mesh truncation techniques for the solution of Maxwell's equations using the finite-difference time domain method
… to open region radiation problems requires the truncation of the infinite domain down to a finite-sized domain amenable to numerical simulation. The accuracy of the solution and the computational expense required to attain the solution are dependent on the method used to simulate the infinite …
Page 1 of 19