Browsing by Subject "Approximation theory"
Now showing items 21-40 of 80
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Article
Hadron structure in lattice QCD
(2012)Recent progress in hadron structure calculations within lattice QCD is reviewed. Results on key observables such as the axial charge, the quark momentum fraction and the spin content of the nucleon are discussed with focus ...
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Article
The hp finite element method for problems in mechanics with boundary layers
(1998)Boundary layer phenomena are well-known in the study of fluid flow problems. Perhaps less known, but equally ubiquitous, is their existence in thermal, plate and shell analysis, where they also play a very significant role. ...
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Conference Object
H∞-optimal control of singularly perturbed discrete-time systems, and risk-sensitive control
(IEEE, 1994)The H∞-optimal control and risk-sensitive control of linear singularly perturbed, discrete-time systems is described. It is shown that the Riccati equation associated with the solution of the H∞-optimal control problem, ...
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Article
Influence of polarization field on the lasing properties of III-nitride quantum wells
(2006)A theoretical investigation of the effect of polarization-induced fields on the optoelectronic properties of a 3 nm In0.2Ga0.8N/GaN single quantum well has been carried out via a self-consistent solution of Schrödinger-Poisson ...
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Article
Influence of water model and nanotube rigidity on the density of water in carbon nanotubes
(2008)The density of water calculated through molecular dynamic simulations using different water models and rigid/flexible carbon nanotubes is studied. A previous equation, determined in an earlier work in order to correlate ...
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Conference Object
Injection molding of dilute and semi-dilute fiber suspensions
(Publ by ASME, 1992)The focus of this paper is unsteady flow of semi-dilute fiber suspensions in complex geometries. These flows are typical of injection molding problems in which the raw material in granular form, usually plastic resin mixed ...
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Article
Limits of data value predictability
(1999)The predictability of data values is studied at a fundamental level. Two basic predictor models are defined: Computational predictors perform an operation on previous values to yield predicted next values. Examples we study ...
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Article
Linear analysis of generalized turbulent hyperbolic flow in a rotating frame
(2007)We apply inviscid rapid distortion theory to the generalized case of turbulent hyperbolic flow in a rotating frame and investigate the dependence of the evolution of the turbulent kinetic energy on the frame rotation rate. ...
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Article
Magnetohydrodynamic turbulence at moderate magnetic Reynolds number
(2004)We consider the case of homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field at low to moderate magnetic Reynolds numbers (by moderate we mean here values as high as 20). When ...
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Article
Matrix decomposition algorithms for modified spline collocation for Helmholtz problems
(2003)We consider the solution of various boundary value problems for the Helmholtz equation in the unit square using a nodal cubic spline collocation method and modifications of it which produce optimal (fourth-) order ...
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Article
A matrix decomposition MFS algorithm for axisymmetric potential problems
(2004)The method of fundamental solutions is a boundary-type meshless method for the solution of certain elliptic boundary value problems. By exploiting the structure of the matrices appearing when this method is applied to ...
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Article
A matrix decomposition RBF algorithm: Approximation of functions and their derivatives
(2007)We propose an efficient algorithm for the approximation of functions and their derivatives using radial basis functions (RBFs). The interpolation points are placed on concentric circles and the resulting matrix has a block ...
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Article
Measurement of lifetime and decay-width difference in Bs0→J/ψ decays
(2008)We measure the mean lifetime τ=2/(ΓL+ΓH) and the decay-width difference ΔΓ=ΓL-ΓH of the light and heavy mass eigenstates of the Bs0 meson, BsL0 and BsH0, in Bs0→J/ψ decays using 1.7fb-1 of data collected with the CDF II ...
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Article
The method of fundamental solutions for axisymmetric acoustic scattering and radiation problems
(1998)The method of fundamental solutions (MFS) is applied to acoustic scattering and radiation for axisymmetric bodies and boundary conditions. The fundamental solution of the governing equation and its normal derivative, which ...
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Article
Method of Fundamental Solutions for axisymmetric elasticity problems
(2000)We investigate the use of the Method of Fundamental Solutions (MFS) for the approximate solution of certain problems of three-dimensional elastostatics in isotropic materials. Specifically, we consider problems in which ...
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Article
The method of fundamental solutions for layered elastic materials
(2001)In this paper, we investigate the application of the method of fundamental solutions to two-dimensional elasticity problems in isotropic and anisotropic single materials and bimaterials. A domain decomposition technique ...
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Article
Multilevel characterizations of anisotropic function spaces
(2005)We present a general method for extending decomposition systems of L 2(ℝd) to decomposition systems for the anisotropic Triebel-Lizorkin and Besov spaces, Fp,qα,s and Bp,qα,s, respectively, for the full range of the indexes. ...
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Conference Object
N and N to Δ transition form factors from lattice QCD
(2007)We present recent lattice QCD results on nucleon form factors and N to Δ transition form factors. We predict the parity violating asymmetry in N to Δ and check the off-diagonal Goldberger-Treiman relation.
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Conference Object
N to Δ electromagnetic and axial form factors in full qcd
(2008)Lattice results on the N to Δ electromagnetic, axial-vector and pseudoscalar form factors are evaluated using dynamical staggered sea quarks and domain wall valence quarks for pion masses in the range of 580-350 MeV, as ...
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Conference Object