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Fortran subroutines for network flow optimization using an interior point algor...
Portugal,L. F.; Resende,M. G. C.; Veiga,G.; Patrício,J.; Júdice,J. J.We describe Fortran subroutines for network flow optimization using an interior point network flow algorithm, that, together with a Fortran language driver, make up PDNET. The algorithm is described in detail and its implementation is outlined. Usage of the package is described and some computational experiments are reported. Source code for the software can be downloaded at http://www.research.att.com/~mgcr/pd...
The directional instability problem in systems with frictional contacts
Pinto da Costa, A.; Martins, J. A. C.; Figueiredo, I. N.; Júdice, J. J.The research summarized in this paper addresses the directional instability of finite dimensional systems with unilateral frictional contacts. Conditions for the occurrence of this divergence type instability are discussed, complementarity formulations are developed, and numerical procedures are proposed for the solution of the corresponding non-smooth stability eigenproblems. Various examples are analytically ...
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