| 2/1998 |
Dynamic choice of the leaving-face criterion in bound-constrained quadratic minimization Maria A. Diniz-Ehrhardt, Márcia A. Gomes-Ruggiero, Sandra A. Santos In this work we focus our attention on the quadratic subproblem of trust–region algorithms for bound–constrained minimization, proposing and testing dynamic choices for the parameter in charge of the decision of leaving or not the current face of the feasible set. The practical consequences of an appropriate decision of such parameter have shown to be crucial, particularly when dual degenerate and ill-conditioned problems are solved.  rp-1998-2.pdf |
| 1/1998 |
Generic one parameter families of reversible vector fields Cláudio A. Buzzi, Marco A. Teixeira In the present paper we study the dynamics of a class of reversible vector fields having eigenvalues (0 ; \alpha i; \alphai ) around their symmetric equilibria. We give a complete list of all normal forms for such vector fields, their versal unfoldings, and the corresponding bifurcation diagrams of codimensional one case. We also obtain some important conclusions on the existence of homoclinic and heteroclinic orbits, invariant tori and symmetric periodic orbits. rp-1998-1.pdf |
| 95/1997 |
The beginning of the Fucik spectrum for the p-Laplacian M. Cuesta, Djairo G. Figueiredo, J. P. Gossez  rp-1997-95.gif, rp-1997-95.pdf |
| 94/1997 |
Análise de Estabilidade para Métodos de Diferenças Finitas: Equações Parabólicas Lineares Saulo Pomponet Oliveira, Petrônio Pulino rp-1997-94.gif, rp-1997-94.pdf |
| 93/1997 |
Equivalence Classes of Quasi-Projective Transformations Marcelo Firer rp-1997-93.gif, rp-1997-93.pdf |
| 92/1997 |
Nonmonotone Spectral Projected Gradient Methods on Convex Sets Ernesto G. Birgin, José Mario Martínez, Marcos Raydan rp-1997-92.gif, rp-1997-92.pdf |
| 91/1997 |
Implementando Critérios Dinâmicos de Decisão Para Controlar a Estratégia de Globalização de ROUXINOL Patrícia Nunes da Silva, Márcia A. Gomes-Ruggiero rp-1997-91.gif, rp-1997-91.pdf |
| 90/1997 |
Resolução de Problemas de Controle Ótimo Utilizando o Algoritmo BOX Alberto Adami, Márcia A. Gomes-Ruggiero rp-1997-90.gif |
| 89/1997 |
An Error Estimates Uniform in Time for Spectral Galerkin Approximations of the Magneto-Micropolar Fluid Equations Elva E. Ortega-Torres, Marko A. Rojas-Medar rp-1997-89.gif |
| 88/1997 |
Uma Metodologia de Dessazonalização de Índices de Preços ao Consumidor Via Método X11-Arima Emanuel P. Barbosa, Wanderley Ramalho, Valéria de Aquino rp-1997-88.gif |
