Browsing by Subject "Perturbation techniques"
Now showing items 21-35 of 35
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Article
A numerical study on the finite element solution of singularly perturbed systems of reaction-diffusion problems
(2007)We consider the approximation of singularly perturbed systems of reaction-diffusion problems, with the finite element method. The solution to such problems contains boundary layers which overlap and interact, and the ...
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Article
Observation of the equilibrium CuB-CO complex and functional implications of the transient heme a3 propionates in cytochrome ba3-CO from Thermus thermophilus. Fourier transform infrared (FTIR) and time-resolved step-scan FTIR studies
(2002)We report the first evidence for the existence of the equilibrium CuB 1+-CO species of CO-bound reduced cytochrome ba3 from Thermus thermophilus at room temperature. The frequency of the C-O stretching mode of CuB 1+-CO ...
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Article
On the stability of the simple shear flow of a Johnson-Segalman fluid
(1998)We solve the time-dependent simple shear flow of a Johnson-Segalman fluid with added Newtonian viscosity. We focus on the case where the steady-state shear stress/shear rate curve is not monotonic. We show that, in addition ...
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Article
Optimal mesh design for the finite element approximation of reaction-diffusion problems
(2002)We consider the numerical approximation of singularly perturbed problems, and in particular reactiondiffusion problems, by the h version of the finite element method. We present guidelines on how to design non-uniform ...
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Article
A Parameter Robust Finite Element Method for Fourth Order Singularly Perturbed Problems
(2017)We consider fourth order singularly perturbed problems in one-dimension and the approximation of their solution by the h version of the finite element method. In particular, we use piecewise Hermite polynomials of degree ...
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Conference Object
Perturbative renormalization of staggered fermion operators with stout improvement: Application to the magnetic susceptibility of QCD
(Proceedings of Science (PoS), 2013)We calculate the fermion propagator and the quark-antiquark Green's functions for a complete set of ultralocal fermion bilinears, Γ [Γ: scalar (S), pseudoscalar (P), vector (V), axial (A) and tensor (T)], using perturbation ...
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Article
Renormalization and mixing in lattice QCD: The case of the chromomagnetic operator
(2014)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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Conference Object
Robust adaptive nonlinear control design
(Publ by IEEE, 1993)An adaptive control design procedure for a class of nonlinear systems with both parametric uncertainty and unknown nonlinearities is presented. The unknown nonlinearities lie within some 'bounding functions' which are ...
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Article
Robust approximation of singularly perturbed delay differential equations by the hp finite element method
(2013)We consider the finite element approximation of the solution to a singularly perturbed second order differential equation with a constant delay. The boundary value problem can be cast as a singularly perturbed transmission ...
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Article
Stochastic testing of finite state machines
(2001)This paper discusses an approach that uses statistical observations about the steady-state behavior of a finite state machine (FSM) in order to detect and identify permanent failures in its state transition mechanism. The ...
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Article
Structural modification. Part 2: Assignment of natural frequencies and antiresonances by an added beam
(2005)In this paper the inverse structural modification problem is solved in order to determine the dimensions of the cross-section of a beam that when added to an original structure will assign natural frequencies or antiresonances ...
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Conference Object
A Systems Approach to Channel Equalization
(2003)In this paper we present a control theoretic frame-work for channel equalization. Channel equalization methods are used to mitigate the effects of inter-symbol interference (ISI). Traditional methods, maximize the signal ...
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Article
Time resolved infrared absorption studies of geminate recombination and vibrational relaxation in OCIO photochemistry
(2004)The first ultrafast time-resolved infrared absorption studies of the geminate recombination and vibrational relaxation dynamics of aqueous chlorine dioxide (OCIO) were presented. The rapid increase in optical density ...
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Article
Time-dependent plane Poiseuille flow of a Johnson-Segalman fluid
(1999)We numerically solve the time-dependent planar Poiseuille flow of a Johnson-Segalman fluid with added Newtonian viscosity. We consider the case where the shear stress/shear rate curve exhibits a maximum and a minimum at ...
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Article
Worldline path integral for the massive Dirac propagator: A four-dimensional approach
(1999)We simplify and generalize an approach proposed by Di Vecchia and Ravndal to describe a massive Dirac particle in external vector and scalar fields. Two different path integral representations for the propagator are derived ...