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 James Baglama

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Average citations per article4.60
Citation Count69
Publication count15
Publication years1998-2017
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Average downloads per article1,130.00
Downloads (cumulative)1,130
Downloads (12 Months)30
Downloads (6 Weeks)1
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15 results found Export Results: bibtexendnoteacmrefcsv

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1
September 2017 Numerical Algorithms: Volume 76 Issue 1, September 2017
Publisher: Springer-Verlag New York, Inc.
Bibliometrics:
Citation Count: 0

Banded linear systems occur frequently in mathematics and physics. However, direct solvers for large systems cannot be performed in parallel without communication. The aim of this paper is to develop a general asymmetric banded solver with a direct approach that scales across many processors efficiently. The key mechanism behind this ...
Keywords: Asynchronous, Direct solver, LAPACK, Linear systems, 65F05, Banded, Parallel, 15A06

2
January 2014 Applied Mathematics and Computation: Volume 227 Issue C, January 2014
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 0

We propose periodic systems of phytoplankton-zooplankton interactions with toxin producing phytoplankton to study the effects of TPP upon extinction and persistence of the populations. Using the concept of uniform persistence, it is proved that the two populations can coexist for certain parameter regimes. The numerical investigation demonstrates that toxin producing ...
Keywords: Periodic systems, Poincaré maps, Toxin, Phytoplankton, Uniform persistence, Zooplankton

3
January 2014 Applied Mathematics and Computation: Volume 227, January, 2014
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 1

We propose periodic systems of phytoplankton-zooplankton interactions with toxin producing phytoplankton to study the effects of TPP upon extinction and persistence of the populations. Using the concept of uniform persistence, it is proved that the two populations can coexist for certain parameter regimes. The numerical investigation demonstrates that toxin producing ...
Keywords: Phytoplankton, Uniform persistence, Zooplankton, Periodic systems, Poincaré maps, Toxin

4
October 2013 Numerical Algorithms: Volume 64 Issue 2, October 2013
Publisher: Springer-Verlag New York, Inc.
Bibliometrics:
Citation Count: 1

The LSQR iterative method for solving least-squares problems may require many iterations to determine an approximate solution with desired accuracy. This often depends on the fact that singular vector components of the solution associated with small singular values of the matrix require many iterations to be determined. Augmentation of Krylov ...
Keywords: Krylov subspace, Least-squares approximation, Large-scale computation, 65F15, Partial singular value decomposition, 15A18, Augmentation, Iterative method, LSQR, Precondition

5
January 2007 Journal of Computational and Applied Mathematics - Special issue: Applied computational inverse problems: Volume 198 Issue 2, 15 January 2007
Publisher: Elsevier Science Publishers B. V.
Bibliometrics:
Citation Count: 4

The solution of large linear discrete ill-posed problems by iterative methods continues to receive considerable attention. This paper presents decomposition methods that split the solution space into a Krylov subspace that is determined by the iterative method and an auxiliary subspace that can be chosen to help represent pertinent features ...
Keywords: GMRES, LSQR, RRGMRES, inverse problem, decomposition, augmentation, ill-posed problem, iterative method

6
January 2006 Mathematical and Computer Modelling: An International Journal: Volume 43 Issue 1-2, January, 2006
Publisher: Elsevier Science Publishers B. V.
Bibliometrics:
Citation Count: 2

Models of nutrient-plankton interaction with a toxic substance that inhibits either the growth rate of phytoplankton, zooplankton or both trophic levels are proposed and studied. For simplicity, it is assumed that both nutrient and the toxin have the same constant input and washout rate as the chemostat system. The effects ...
Keywords: Uniform persistence, Inhibitor, Liapunov function, Plankton populations, Asymptotic dynamics, Toxin

7
October 2005 Applied Mathematics and Computation: Volume 169 Issue 2, October, 2005
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 0

Droop models of nutrient-phytoplankton-zooplankton interaction with intratrophic predation of zooplankton are introduced and investigated. The models proposed in this study are open ecosystems which include both a constant and a periodic input nutrient models. A simple stochastic model mimics a randomly varying nutrient input is also presented. For the deterministic ...
Keywords: Cell quota, Intratrophic predation, Uniform persistence, Poincaŕe maps, Wiener process

8
July 2005 SIAM Journal on Scientific Computing: Volume 27 Issue 1, 2005
Publisher: Society for Industrial and Applied Mathematics
Bibliometrics:
Citation Count: 15

New restarted Lanczos bidiagonalization methods for the computation of a few of the largest or smallest singular values of a large matrix are presented. Restarting is carried out by augmentation of Krylov subspaces that arise naturally in the standard Lanczos bidiagonalization method. The augmenting vectors are associated with certain Ritz ...
Keywords: iterative method, large-scale computation, partial singular value decomposition, singular value computation

9
January 2005 Computers & Mathematics with Applications: Volume 49 Issue 2-3, January, 2005
Publisher: Pergamon Press, Inc.
Bibliometrics:
Citation Count: 1

In this paper, nutrient-phytoplankton-zooplankton interaction with general uptake functions in which nutrient recycling is either instantaneous or delayed is considered. To account for higher predation, zooplankton's death rate is modeled by a quadratic term instead of the usual linear function. Persistence conditions for each of the delayed and nondelayed models ...
Keywords: Delayed nutrient recycling, Instantaneous nutrient recycling, Uniform persistence

10 published by ACM
September 2003 ACM Transactions on Mathematical Software (TOMS): Volume 29 Issue 3, September 2003
Publisher: ACM
Bibliometrics:
Citation Count: 6
Downloads (6 Weeks): 1,   Downloads (12 Months): 30,   Downloads (Overall): 1,130

Full text available: PDFPDF
irbleigs is a MATLAB program for computing a few eigenvalues and associated eigenvectors of a sparse Hermitian matrix of large order n . The matrix is accessed only through the evaluation of matrix-vector products. Working space of only a few n -vectors is required. The program implements a restarted block-Lanczos ...
Keywords: Block Lanczos method, eigenvalue computation, generalized eigenproblem, singular values, polynomial acceleration

11
August 2003 Mathematical and Computer Modelling: An International Journal: Volume 38 Issue 3-4, August, 2003
Publisher: Elsevier Science Publishers B. V.
Bibliometrics:
Citation Count: 5

Nutrient-phytoplankton-zooplankton models with general uptake functions in which only the internal nutrient concentration is capable of catalyzing cell growth and division for phytoplankton are proposed and analyzed. For the constant nutrient input model, it is shown that extinction or persistence of the population depends on its maximal growth rate relative ...
Keywords: Periodic system, Cell quota, Poincaré map, Obligate predator, Uniform persistence

12
July 2002 Applied Mathematics and Computation: Volume 129 Issue 2-3, 10 July 2002
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 1

A simple food chain which consists of nutrient, prey and predator with intratrophic predation of the predator is proposed and analyzed. The dynamics of the model depend on the basic reproductive numbers of the prey and predator. Intratrophic predation can have impact on the system only if the basic reproductive ...
Keywords: Intratrophic predation, Thresholds, Cannibalism, Persistence

13
May 2002 SIAM Journal on Scientific Computing: Volume 24 Issue 5, 2002
Publisher: Society for Industrial and Applied Mathematics
Bibliometrics:
Citation Count: 11

The irbleigs code is an implementation of an implicitly restarted block-Lanczos method for computing a few selected nearby eigenvalues and associated eigenvectors of a large, possibly sparse, Hermitian matrix A . The code requires only the evaluation of matrix-vector products with A ; in particular, factorization of A is not ...
Keywords: block-Lanczos method, singular value computation, eigenvalue computation, polynomial acceleration

14
December 1998 SIAM Journal on Scientific Computing: Volume 20 Issue 1, Aug. 1998
Publisher: Society for Industrial and Applied Mathematics
Bibliometrics:
Citation Count: 20

The restarted GMRES algorithm proposed by Saad and Schultz [ SIAM J. Sci. Statist. Comput ., 7 (1986), pp. 856--869] is one of the most popular iterative methods for the solution of large linear systems of equations Ax = b with a nonsymmetric and sparse matrix. This algorithm is particularly ...
Keywords: nonsymmetric linear system, Arnoldi process, iterative method, preconditioner

15
October 1998 Journal of Computational Physics: Volume 146 Issue 1, Oct. 10, 1998
Publisher: Academic Press Professional, Inc.
Bibliometrics:
Citation Count: 1

Equilibrium configurations of liquid crystals in a finite containment are minimizers of the thermodynamic free energy of the system. It is important to be able to track an equilibrium configuration as the temperature of the liquid crystals is decreased. The path of the minimal energy configuration at a bifurcation point ...
Keywords: polynomial acceleration, equilibrium configuration, bifurcation, block Lanczos method, continuation method



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