Browsing by Subject "Perturbation techniques"
Now showing items 1-20 of 35
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Article
A C1-conforming hp finite element method for fourth order singularly perturbed boundary value problems
(2016)We consider a fourth order singularly perturbed boundary value problem (BVP) in one-dimension and the approximation of its solution by the hp version of the Finite Element Method (FEM). The given problem's boundary conditions ...
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Article
Charged-particle multiplicity p p̄ collisions at √s = 1.8 TeV
(2001)The mean charged-particle multiplicity of jets in dijet events with dijet masses were analyzed using collider detectors. The jet energy and direction were measured in the central lead-scintillator electromagnetic (CEM) and ...
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Conference Object
The chromomagnetic operator on the lattice
(Proceedings of Science (PoS), 2013)We study matrix elements of the "chromomagnetic" operator on the lattice. This operator is contained in the strangeness-changing effective Hamiltonian which describes electroweak effects in the Standard Model and beyond. ...
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Article
Comparative study of perturbative methods for computing electron transfer tunneling matrix elements with a nonorthogonal basis set
(2006)The authors consider the problem of computing tunneling matrix elements for bridge-mediated electron transfer reactions using the Löwdin [J. Math. Phys. 3, 969 (1962)
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Article
Convergence analysis of an hp finite element method for singularly perturbed transmission problems in smooth domains
(2013)We consider a two-dimensional singularly perturbed transmission problem with two different diffusion coefficients, in a domain with smooth (analytic) boundary. The solution will contain boundary layers only in the part of ...
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Conference Object
Distributed Cooperation and Adversity: Complexity Trade-Offs
(2003)The problem of cooperatively performing a collection of tasks in a decentralized setting where the computing medium is subject to adversarial perturbations is one of the fundamental problems in distributed computing. Such ...
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Article
Electronic structure of piezoelectric double-barrier InAs/InP/InAs/InP/InAs (111) nanowires
(2004)The numerical self-consistent solution of the Poisson-Schrodinger equations in cylindrical coordinates for calculating electronic states in the effective mass approximation was implemented. High accuracy and rapid convergence ...
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Article
Finite element analysis of an exponentially graded mesh for singularly perturbed problems
(2015)We present the mathematical analysis for the convergence of an h version Finite Element Method (FEM) with piecewise polynomials of degree p ≥ 1, defined on an exponentially graded mesh. The analysis is presented for a ...
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Article
Finite element methods for a singularly perturbed transmission problem
(2009)We consider a one-dimensional singularly perturbed transmission problem with two different diffusion coefficients. The solution will contain boundary layers only in the part of the domain where the diffusion coefficient ...
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Article
Finite-time disturbance attenuation control problem for singularly perturbed discrete-time systems
(1998)In this paper we consider the problem of finite-time H∞-optimal control of linear, singularly perturbed, discrete-time systems. The problem is addressed from the game theoretic approach. This leads to a singularly perturbed, ...
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Article
An hp finite element method for a 4th order singularly perturbed boundary value problem in two dimensions
(2017)We consider a fourth order singularly perturbed boundary value problem posed in a square and the approximation of its solution by the hp version of the finite element method on the so-called Spectral Boundary Layer mesh. ...
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Article
hp finite element methods for fourth order singularly perturbed boundary value problems
(2013)We consider fourth order singularly perturbed boundary value problems (BVPs) in one-dimension and the approximation of their solution by the hp version of the Finite Element Method (FEM). If the given problem's boundary ...
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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
Measurement of the cross section for prompt diphoton production in pp Collisions at TeV
(2005)We report a measurement of the rate of prompt diphoton production in pp collisions at 1.96 TeV using a data sample of 207 pb 1 collected with the upgraded Collider Detector at Fermilab. The background from nonprompt sources ...
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Article
Mechanism for extrusion instabilities in polymer melts
(1999)A mechanism for explaining some of the instabilities observed during the extrusion of polymer melts is further explored. This is based on the combination of non-monotonic slip and elasticity, which permits the existence ...
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Article
New analytical solutions for weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity
(2016)Steady-state, isothermal, Poiseuille flows in straight channels and circular tubes of weakly compressible Newtonian fluids are considered. The major assumption is that both the mass density and the shear viscosity of the ...
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Article
A new class of nonlinear robust adaptive controllers
(1996)Recently, a new class of adaptive control schemes, motivated from nonlinear systems theory, has been proposed for minimum phase linear time invariant plants. Under certain assumptions on the plant transfer function, these ...
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Article
Non-peturbative density expansions for extended Coulomb systems
(2000)We present a general non-perturbative argument that combines the Pauli and virial theorems for a multicomponent translationally invariant Coulombic system of fermions at zero temperature, and which by an iteration procedure ...
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Article
A note on the convergence rate of the finite element method for singularly perturbed problems using the Shishkin mesh
(2003)We consider the numerical approximation of singularly perturbed problems by the h version of the finite element method on a piecewise uniform, Shishkin mesh. It is well known that this method yields uniform approximations, ...
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Article
A note on the unbounded creeping flow past a sphere for Newtonian fluids with pressure-dependent viscosity
(2015)We investigate theoretically isothermal, incompressible, creeping Newtonian flows past a sphere, under the assumption that the shear viscosity is pressure-dependent, varying either linearly or exponentially with pressure. ...