Now showing items 1-10 of 83
Núcleos de Ensino da Unesp: artigos 2007
(Coleção PROGRAD (UNESP), 2011) [Livro]
The Hopf bifurcation in the Shimizu-Morioka system
(Nonlinear Dynamics, 2015-02-01) [Artigo]
We study the local Hopf bifurcations of codimension one and two, which occur in the Shimizu-Morioka system. This system is a simplified model proposed for studying the dynamics of the well-known Lorenz system for large ...
On the number of limit cycles in discontinuous piecewise linear differential systems with two pieces separated by a straight line
(Journal Of Mathematical Analysis And Applications, 2015-04-01) [Artigo]
In this paper we study the maximum number N of limit cycles that can exhibit a planar piecewise linear differential system formed by two pieces separated by a straight line. More precisely, we prove that this maximum number ...
Patterns in parabolic problems with nonlinear boundary conditions
(Journal of Mathematical Analysis and Applications, 2007-01-15) [Artigo]
We obtain existence of asymptotically stable nonconstant equilibrium solutions for semilinear parabolic equations with nonlinear boundary conditions on small domains connected by thin channels. We prove the convergence of ...
Families of special Weierstrass points
(Comptes Rendus Mathematique, 2009-11-01) [Artigo]
The purpose of this Note is to show that loci of (special) Weierstrass points on the fibers of a family pi: X -> S of smooth curves of genus g >= 2 can be studied by simply pulling back the Schubert calculus naturally ...
Hamming and Reed-Solomon codes over certain rings
(Computational & Applied Mathematics, 2001-01-01) [Artigo]
In this work we present extensions of constructions of Hamming and Reed-Solomon codes over local finite commutative rings with identity obtained from algebraic integer rings of a number field. Also, we present efficient ...
On the reversible quadratic polynomial vector fields on S-2
(Journal of Mathematical Analysis and Applications, 2012-12-15) [Artigo]
We study a class of quadratic reversible polynomial vector fields on 52 with (3, 2)-type reversibility. We classify all isolated singularities and we prove the nonexistence of limit cycles for this class. Our study provides ...
Goppa and Srivastava codes over finite rings
(Computational & Applied Mathematics, 2005-08-01) [Artigo]
Goppa and Srivastava codes over arbitrary local finite commutative rings with identity are constructed in terms of parity-cleck matrices. An efficient decoding procedure, based on the modified Berlekamp-Massey algorithm, ...
Topological K-equivalence of analytic function-germs
(Central European Journal of Mathematics, 2010-04-01) [Artigo]
We study the topological K-equivalence of function-germs (a"e (n) , 0) -> (a"e, 0). We present some special classes of piece-wise linear functions and prove that they are normal forms for equivalence classes with respect ...
O sobre-sinal e a resposta inversa em sistemas de controle lineares contínuos no tempo
(Sba: Controle & Automação Sociedade Brasileira de Automatica, 2005-03-01) [Artigo]
Este trabalho trata da determinação dos extremos que podem ocorrer na resposta a uma entrada degrau unitário de sistemas lineares contínuos no tempo, com pólos e zeros reais. Apresentam-se condições necessárias e suficientes ...