Volume 05

Adjoint Sensitivity Analysis of Neutral Delay Differential Models

Issues 1-2 Volume 05

Fathalla A. Rihan2 Department of Mathematical Sciences, College of Science, United Arab Emirates University, Al Ain, 17551, UAE Received 11 October, 2009; accepted in revised form 21 January, 2010 Abstract: In this short paper, we investigate sensitivity and robustness of neutral delay differential models to small perturbations in the parameters that occur in the models, […]

On the Covariance of Generalized Inverses in C*-Algebra

Issues 3-4 Volume 05

M.H. Alizadeh2 Department of Mathematics, Islamic Azad University-Nur Branch, Nur, P. O. Box: 46415/444, Iran Received 30 September, 2008; accepted in revised form 8 December, 2010 Abstract: This paper gives a complete characterization of covariance set of regular elements in a C -algebra. Moreover, it is proved that if a and b are simply polar

Landmark-Based Registration Using a Local Radial Basis Function Transformation

Issues 3-4 Volume 05

R. Cavoretto2, A. De Rossi3 Department of Mathematics, University of Turin, via C. Alberto 10, I-10123, Turin, Italy B. Quatember4 Innsbruck Medical University (Radiology), Anichstrasse 35, 6020 Innsbruck, Austria Received 19 January, 2009; accepted in revised form 18 December, 2010 Abstract: In this paper we propose the use of a local image transformation involving radial

Logical Termination of Work ows: An Interdisciplinary Approach

Issues 3-4 Volume 05

Gloria Cravo2 Centro de Ci?encias Exactas e da Engenharia, Universidade da Madeira, 9000-390 Funchal, Madeira, Portugal Received 17 January, 2009; accepted in revised form 14 December, 2010 Abstract: In this paper we present a new formalism to study the structure of workflows. A workflow is an abstraction of a business process that consists of one

Hamiltonian Boundary Value Methods (Energy Preserving Discrete Line Integral Methods)

Issues 1-2 Volume 05

Luigi Brugnano3 Dipartimento di Matematica “U.Dini”, Universit`a di Firenze Viale Morgagni 67/A, I-50134 Firenze, Italy Felice Iavernaro4 Dipartimento di Matematica, Universit`a di Bari Via Orabona 4, I-70125 Bari, Italy Donato Trigiante5 Dipartimento di Energetica “S.Stecco”, Universit`a di Firenze Via Lombroso 6/17, I-50134 Firenze, Italy Received October 25, 2009; accepted in revised form April 15, 2010.

Energy-Preserving Variant of Collocation Methods

Issues 1-2 Volume 05

E. Hairer3 Universit´┐Że de Gen`eve, Section de Math´┐Żematiques, 2-4 rue du Li`evre, CH-1211 Gen`eve 4, Switzerland Received 15 October, 2009; accepted in revised form 21 March, 2010 Abstract: We propose a modification of collocation methods extending the ‘averaged vector field method’ to high order. These new integrators exactly preserve energy for Hamiltonian systems, are of

Finite Difference Finite element and B-Spline Collocation Methods Applied to Two Parameter Singularly Perturbed Boundary Value Problems

Issues 3-4 Volume 05

M.K. Kadalbajoo and A.S.Yadaw2 Department of Mathematics and Statistics, Indian Institute of Technology Kanpur, Kanpur 208016, India Received 9 December, 2009; accepted in revised form 20 December, 2010 Abstract: The objective of this paper is to present a comparative study of fitted-mesh finite difference method, Ritz-Galerkin finite element method and B-spline collocation method for a

Explicit Implementation of Collocation Methods for Stiff Systems with Complex Spectrum

Issues 1-2 Volume 05

B. V. Faleichik2 Computational Mathematics Department, Faculty of Applied Mathematics and Computer Science, Belarusian State University, 220030 Minsk, Belarus Received October 21, 2009; accepted in revised form January 19, 2010. Abstract: Currently there are two general ways to solve stiff differential equations numerically. The first approach is based on implicit methods and the second uses

On Conjugate B-series and Their Geometric Structure

Issues 1-2 Volume 05

Abstract: The characterizations of B-series of symplectic and energy preserving integrators are well-known. The graded Lie algebra of B-series of modified vector fields include the Hamiltonian and energy preserving cases as Lie subalgebras, these spaces are relatively well understood. However, two other important classes are the integrators which are conjugate to Hamiltonian and energy preserving

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