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Mechanical and electrochemical deterioration mechanisms in the tribocorrosion o...
Vieira, A. C.; Rocha, L. A.; Papageorgiou, Nikolaos; Mischler, S.Tribocorrosion of Al-Si-Cu-Mg alloys was investigated in 0.05 M NaCl and 0.1 M NaNO3 solutions under severe sliding and controlled electrochemical conditions. A simple galvanic coupling model was developed to analyze and quantitatively predict the evolution potential of the open circuit potential during tribocorrosion. According to this model and the obtained results, galvanic coupling was established in the Na...
Nontrivial solutions for nonvariational quasilinear neumann problems
Papageorgiou, Nikolaos S.; Santos, Sandrina R. A.; Staicu, VasileWe consider a nonlinear nonvariational Neumann problem with a nonsmooth potential. Using the spectrum of the assymptotic (as ; x; - ∞) differential operator and degree theoretic techniques based on the degree map of certain multivalued perturbations of (S)+-operators, we establish the existence of at least one nontrivial smooth solution.
Three nontrivial solutions for the p-Laplacian Neumann problems with a concave ...
Aizicovici, Sergiu; Papageorgiou, Nikolaos; Staicu, VasileWe consider a nonlinear Neumann problem driven by the p- Laplacian, with a right-hand side nonlinearity which is concave near the origin. Using variational techniques, combined with the method of upper-lower solutions and with Morse theory, we show that the problem has at least three nontrivial smooth solutions, two of which have a constant sign (one positive and one negative). ; FCT ; POCI/MAT/55524/2004
Resonant nonlinear periodic problems with the scalar p-Laplacian and a nonsmoot...
Aizicovici, Sergiu; Papageorgiou, Nikolaos; Staicu, VasileWe study periodic problems driven by the scalar p-Laplacian with a nonsmooth potential. Using the nonsmooth critical point theory for locally Lipsctiz functions,we prove two existence theorems under conditions of resonance at infinity with respect to the first two eigenvalues of the negative scalar p-Laplacian with periodic boundary conditions. ; Universidade de Aveiro
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