https://nexus.univalle.edu.co/index.php/nexus/%20article%20/view%20/9274

Eurosurveillance - View Article

Eurosurveillance - View Article

Note from the editors: A new virus bringing back memories from the past Detection of a novel human coronavirus by real-time reversetranscription polymerase chain reaction Novel coronavirus associated with severe respiratory disease: Case definition and public health measures I-MOVE: a European network to measure the effectiveness of influenza vaccines Survey of delivery of prophylactic immunogl...

Pii: S0168-9274(98)00118-4

A number of recently proposed preconditioning techniques based on sparse approximate inverses are considered. A description of the preconditioners is given, and the results of an experimental comparison performed on one processor of a Cray C98 vector computer using sparse matrices from a variety of applications are presented. A comparison with more standard preconditioning techniques, such as i...

Pii: S0168-9274(98)00031-2

Multiple time stepping can be applied to the leapfrog/Strrmer/Verlet integrator so as to effect a variable step size algorithm. The strategy maintains the symplecticness, time-reversibility, and second-order accuracy of the leapfrog method. This method can be applied to 2-body central force interactions by partitioning them into distance classes and smoothly decomposing the potential energy int...

Pii: S0168-9274(00)00033-7

We derive conservative fourthand sixth-order finite difference approximations for the divergence and gradient operators and a compatible inner product on staggered 1D uniform grids in a bounded domain. The methods combine standard centered difference formulas in the interior with new one-sided finite difference approximations near the boundaries. We derive compatible inner products for these di...