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- G. Montero, L. González, E. Flórez, M. D. García, A. Suárez
- Numerical Lin. Alg. with Applic.
- 2002

Quasi-minimal residual algorithms, these are QMR, TFQMR and QMRCGSTAB, are biorthog-onalisation methods for solving nonsymmetric linear systems of equations which improve the irregular behaviour of BiCG, CGS and BiCGSTAB algorithms, respectively. They are based on the quasi-minimisation of the residual using the standard Givens rotations that lead to… (More)

- Armando Pérez, Rogelio Ramos, Gisela Montero, Marcos Coronado, Conrado García, Rubén Pérez
- Journal of analytical methods in chemistry
- 2016

The gases emissions measurement systems in internal combustion engines are strict and expensive nowadays. For this reason, a virtual instrument was developed to measure the combustion emissions from an internal combustion diesel engine, running with diesel-biodiesel mixtures. This software is called virtual instrument for emissions measurement (VIEM), and… (More)

Four hydrophilic polymers in the form of beads – chitosan, alginate, alginate/polyvinyl alcohol (PVA), and chitosan-coated alginate – were used as supports for lipase immobilisation. Hydrogel beads were characterised by bead-size-distribution estimation, surface morphology studies, and polymer interactions assessment. Matrix performances – loading… (More)

- A. Suárez, H. Sarmiento, E. Flórez, M. D. García, G. Montero
- J. Computational Applied Mathematics
- 2011

The efficiency of a finite element mass-consistent model for wind field adjustment depends on the stability parameter α which allows from a strictly horizontal wind adjustment to a pure vertical one. Each simulation with the wind model leads to the resolution of a linear system of equations, the matrix of which depends on a function ε(α), i.e., (M + εN) x ε… (More)

- G. Montero
- 2006

LISA PathFinder (LPF) will be flown with the objective to test in space key technologies for LISA. However its sensitivity goals are, for good reason, one order of magnitude less than those which LISA will have to meet, both in drag-free and optical metrology requirements, and in the observation frequency band. While the expected success of LPF will of… (More)

We experimentally study how reordering techniques affect the rate of convergence of pre-conditioned Krylov subspace methods for nonsymmetric sparse linear systems, where the preconditioner is a sparse approximate inverse. In addition, we show how the reordering reduces the number of entries in the approximate inverse and thus, the amount of storage and… (More)

An over view of advanced techniques for solving large sparse linear systems of equations is presented. We are interested in the resolution of, Ax = b (1) where A is a sparse, large and non-singular matrix. The first question is if it is better a direct or an iterative resolution. The main disadvantage of direct methods compared with iterative ones is that… (More)

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