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Artículos Encontrados 187 registros  inicioanterior142 - 151siguientefinal  ir al registro: La búsqueda tardó 0.00 segundos. 
142.
5 p, 253.1 KB On the nonintegrability of magnetic field lines / Mahdi, Adam (University of North Carolina at Charlotte. Mathematics Department) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We show that a magnetic field created by a simple planar configuration of three rectilinear wires may not be holomorphically integrable when considered as a vector field in C3. In particular the method of the proof gives an easy way of showing that the corresponding real vector field does not admit a real polynomial first integral. [...]
2013 - 10.1016/j.physd.2013.02.002
Physica D. Nonlinear phenomena, Vol. 251 (2013) , p. 60-62  
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143.
18 p, 338.2 KB Qualitative study of the charged restricted three-body problem / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Pasca, Daniel (University of Oradea(Rumania). Department of Mathematics and Informatics) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We characterize the global flow of the restricted threebody problem in which we have two mass points of equal masses m1 = m2 > 0 and equal charge q1 = q2 moving on a straight line under Newtonian and Coulombian forces with their centre of mass being fixed at the origin of coordinates and the third mass point with infinitesimal mass, is moving on the straight line perpendicular to the line of motion of the first two mass points and passing through their centre of mass.
2013 - 10.1016/j.jde.2013.04.012
Journal of differential equations, Vol. 255 (2013) , p. 326-338  
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144.
26 p, 748.4 KB On the Darboux integrability of Blasius and Falkner-Skan equation / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We study the Darboux integrability of the celebrated Falkner-Skan equation f''' + ff'' + λ(1−f'2) = 0, where λ is a parameter. When λ = 0 this equation is known as Blasius equation. We show that both differential systems have no first integrals of Darboux type. [...]
2013 - 10.1016/j.compfluid.2013.06.027
Computers & Fluids, Vol. 86 (2013) , p. 71-76  
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145.
8 p, 663.0 KB Generalized Weierstrass integrability for the complex differential equations dy/dx=a(x)y^4 b(x)y^3 c(x)y^2 d(x)y e(x) / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We characterize the differential equations of the form dy/dx = a(x)y4 + b(x)y3 + c(x)y2 + d(x)y + e(x), where a, b, c, d, e are meromorphic functions in the variable x, that admits either a generalized Weierstrass first integral or a generalized Weierstrass inverse integrating factor.
2013 - 10.1016/j.aml.2013.03.018
Applied mathematics letters, Vol. 26 Núm. 8 (2013) , p. 836-841  
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146.
16 p, 744.9 KB Darboux integrability of polynomial differential systems in R^3 / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
In this article we study the Darboux integrability of the polynomial differential systems x˙ = y − x2, y˙ = z − x, z˙ = −d − ax − by − cz. This system comes from the study of a Hopf bifurcation in slow-fast systems with two slow variables and one fast variable. [...]
2013
Bulletin of the Belgian Mathematical Society. Simon Stevin, Vol. 20 (2013) , p. 603-619  
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147.
9 p, 757.4 KB Liouvillian first integrals for generalized Liénard polynomial differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We study the Liouvillian first integrals for the generalized Liénard polynomial differential systems of the form x' = y, y' = −g(x) − f(x)y, where g(x) and f(x) are arbitrary polynomials such that 2 ≤ deg g ≤ deg f.
2013 - 10.1515/ans-2013-0404
Advanced Nonlinear Studies, Vol. 13 (2013) , p. 819-829  
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148.
17 p, 323.7 KB Periodic orbits near equilibria via averaging theory of second order / Barreira, Luis (Instituto Superior Técnico(Portugal). Departamento de Matemática) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Instituto Superior Técnico(Portugal). Departamento de Matemática)
Lyapunov, Weinstein and Moser obtained remarkable theorems giving sufficient conditions for the existence of periodic orbits emanating from an equilibrium point of a differential system with a first integral. [...]
2012 - 10.3846/13926292.2012.736090
Mathematical Modelling and Analysis, Vol. 17 Núm. 5 (2012) , p. 715-731  
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149.
8 p, 676.1 KB A note on the first integrals of the ABC system / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
Without loss of generality the ABC systems reduce to two cases: either A = 0 and B, C ≥ 0, or A = 1 and 0 < B, C ≤ 1. In the first case it is known that the ABC system is completely integrable, here we provide its explicit first integrals. [...]
2012 - 10.1063/1.3682692
Journal of Mathematical Physics, Vol. 53 (2012) , p. 1-5 (023505)  
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150.
18 p, 730.8 KB Bifurcation of Limit cycles from a 4-dimensional center in R^m in resonance 1:N / Barreira, Luis (Universidade Técnica de Lisboa. Departamento de Matemática) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
For every positive integer N ≥ 2 we consider the linear differential center ˙x = Ax in Rm with eigenvalues ±i, ±N i and 0 with multiplicity m − 4. We perturb this linear center inside the class of all polynomial differential systems of the form linear plus a homogeneous nonlinearity of degree N, i. [...]
2012 - 10.1016/j.jmaa.2011.12.018
Journal of mathematical analysis and applications, Vol. 389 (2012) , p. 754-768  
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151.
13 p, 605.3 KB On the number of limit cycles of a class of polynomial differential systems / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We study the number of limit cycles of the polynomial differential systems of the form x˙ = y − g1(x) − f1(x)y, y˙ = −x − g2(x) − f2(x)y, where g1, f1, g2 and f2 are polynomials of a given degree. [...]
2012 - 10.1098/rspa.2011.0741
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012, p. 1-14  
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Artículos : Encontrados 187 registros   inicioanterior142 - 151siguientefinal  ir al registro:
Vea también: autores con nombres similares
2 Valls, Carme
191 Valls, Claudia
191 Valls, Claudia
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