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Resultats globals: 40 registres trobats en 0.03 segons.
Articles, 39 registres trobats
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Articles 39 registres trobats  1 - 10següentfinal  anar al registre:
1.
19 p, 300.3 KB An extension of the 16th Hilbert problem for continuous piecewise linear-quadratic centers separated by a non-regular line / Esteban, Marina (Universidad de Córdoba. Departamento de Informática y Análisis Numérico) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento Matemática)
In the last few decades, there has been much interest in studying piecewise differential systems. This is mainly due to the fact that these differential systems allow us to modelize many natural phenomena. [...]
2023 - 10.1063/5.0167089
Chaos, Vol. 33, Issue 12 (December 2023) , art. 123120  
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2.
31 p, 920.4 KB Chiral pH-sensitive cyclobutane beta-amino acid-based cationic amphiphiles : Possible candidates for use in gene therapy / Pi i Boleda, Bernat (Universitat Autònoma de Barcelona. Departament de Química) ; Bouzas, Mireia (Universitat Autònoma de Barcelona. Departament de Química) ; Gaztelumendi, Nerea (Universitat Autònoma de Barcelona. Departament de Biologia Cel·lular, de Fisiologia i d'Immunologia) ; Illa, Ona (Universitat Autònoma de Barcelona. Departament de Química) ; Nogués, C. (Carme) (Universitat Autònoma de Barcelona. Departament de Biologia Cel·lular, de Fisiologia i d'Immunologia) ; Branchadell Gallo, Vicenç (Universitat Autònoma de Barcelona. Departament de Química) ; Pons, Ramon (Institut de Química Avançada de Catalunya. Departament de Tensioactius i Nanobiotecnologia) ; Ortuño Mingarro, Rosa María (Universitat Autònoma de Barcelona. Departament de Química)
Chiral cis/trans diastereomeric cationic amphiphiles have been synthesized and studied. They are based on beta-amino acids and contain C-12- and C-16-alkyl chains, respectively, as hydrophobic tails while the polar head consists of an ammonium cation linked to a cyclobutane ring. [...]
2020 - 10.1016/j.molliq.2019.111856
Journal of Molecular Liquids, Vol. 297 (January 2020) , art. 111856  
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3.
18 p, 2.7 MB Capitalism and extreme poverty : A global analysis of real wages, human height, and mortality since the long 16th century / Sullivan, Dylan (Macquarie University. Macquarie School of Social Sciences) ; Hickel, Jason 1982- (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
This paper assesses claims that, prior to the 19th century, around 90% of the human population lived in extreme poverty (defined as the inability to access essential goods), and that global human welfare only began to improve with the rise of capitalism. [...]
2023 - 10.1016/j.worlddev.2022.106026
World development, Vol. 161 (January 2023) , art. 106026  
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4.
18 p, 1.8 MB On co-orbital quasi-periodic motion in the three-body problem / Cors Iglesias, Josep Maria (Universitat Politècnica de Catalunya. Departament de Matemàtiques) ; Palacián, Jesus F. (Universidad Pública de Navarra. Departamento de Estadística, Informática y Matemáticas) ; Yanguas, Patricia (Universidad Pública de Navarra. Departamento de Estadística, Informática y Matemáticas)
Within the framework of the planar three-body problem we establish the existence of quasi-periodic motions and KAM 4-tori related to the co-orbital motion of two small moons about a large planet where the moons move in nearly circular orbits with almost equal radii. [...]
2019 - 10.1137/18M1190859
SIAM Journal on Applied Dynamical Systems, Vol. 18, Issue 1 (2019) , p. 334-353  
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5.
10 p, 19.8 MB Exploring event horizons and Hawking radiation through deformed graphene membranes / Morresi, Tommaso (European Centre for Theoretical Studies in Nuclear Physics and Related Areas) ; Binosi, Daniele (European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT∗-FBK)) ; Simonucci, Stefano (University of Camerino. School of Science and Technology) ; Piergallini, Riccardo (University of Camerino. School of Science and Technology) ; Roche, Stephan (Institut Català de Nanociència i Nanotecnologia) ; Pugno, Nicola M. (University of Trento. Department of Civil, Environmental and Mechanical Engineering) ; Taioli, Simone (Trento Institute for Fundamental Physics and Applications)
Analogue gravitational systems are becoming an increasing popular way of studying the behaviour of quantum systems in curved spacetime. Setups based on ultracold quantum gases in particular, have been recently harnessed to explore the thermal nature of Hawking's and Unruh's radiation that was theoretically predicted almost 50 years ago. [...]
2020 - 10.1088/2053-1583/aba448
2D Materials, Vol. 7, issue 4 (Oct. 2020) , art. 41006  
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6.
8 p, 295.0 KB 4-dimensional zero-Hopf bifurcation for polynomial differentials systems with cubic homogeneous nonlinearities via averaging theory / Feddaoui, Amina (University of Annaba. Department of Mathematics (Algeria)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Makhlouf, Ammar (University of Annaba. Department of Mathematics (Algeria))
The averaging theory of second order shows that for polynomial differential systems in ℝ4 with cubic homogeneous nonlinearities at least nine limit cycles can be born in a zero-Hopf bifurcation.
2020 - 10.1504/IJDSDE.2020.109106
International Journal of Dynamical Systems and Differential Equations, Vol. 10, Issue 4 (2020) , p. 321-328  
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7.
8 p, 690.4 KB N-dimensional zero-hopf bifurcation of polynomial differential systems via averaging theory of second order / Kassa, Sara (University of Annaba. Department of Mathematics (Algeria)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Makhlouf, Ammar (University of Annaba. Department of Mathematics (Algeria))
Using the averaging theory of second order, we study the limit cycles which bifurcate from a zero-Hopf equilibrium point of polynomial vector fields with cubic nonlinearities in ℝn. We prove that there are at least 3n-2 limit cycles bifurcating from such zero-Hopf equilibrium points. [...]
2020 - 10.1007/s10883-020-09501-6
Journal of Dynamical and Control Systems, vol. 27 (June 2020) p. 283-291  
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8.
14 p, 290.3 KB On the zero-Hopf bifurcation of the Lotka-Volterra systems in R3 / Han, Maoan (Shanghai Normal University. Department of Mathematics (China)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Tian, Yun (Shanghai Normal University. Department of Mathematics (China))
Here we study the Lotka-Volterra systems in R3, i. e. the differential systems of the form dxi/dt = xi(ri - Σ3j=1 aijxj), i = 1, 2, 3. It is known that some of these differential systems can have at least four periodic orbits bifurcating from one of their equilibrium points. [...]
2020 - 10.3390/math8071137
Mathematics, Vol. 8, Issue 7 (July 2020) , art. 1137
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9.
12 p, 572.5 KB Periodic orbits of a Hamiltonian system related with the Friedmann-Robertson-Walker system in rotating coordinates / Buzzi, Claudio (Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas (Brazil)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Santana, Paulo (Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas (Brazil))
We provide sufficient conditions on the four parameters of a Hamiltonian system, related with the Friedmann-Robertson-Walker Hamiltonian system in a rotating reference frame, which guarantee the existence of 12 continuous families of periodic orbits, parameterized by the values of the Hamiltonian, which born at the equilibrium point localized at the origin of coordinates. [...]
2020 - 10.1016/j.physd.2020.132673
Physica D. Nonlinear phenomena, Vol. 413 (December 2020) , art. 132673  
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10.
23 p, 372.4 KB Melnikov analysis in nonsmooth differential systems with nonlinear switching manifold / Bastos, Jefferson L. R (Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas) ; Buzzi, Claudio (Universidade Estadual Paulista. Instituto de Biociências, Letras e Ciências Exatas) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Novaes, Douglas D. (Universidade Estadual de Campinas. Instituto de Matemática, Estatística e Computação Científica)
We study the family of piecewise linear differential systems in the plane with two pieces separated by a cubic curve. Our main result is that 7 is a lower bound for the Hilbert number of this family. [...]
2019 - 10.1016/j.jde.2019.04.019
Journal of differential equations, Vol. 267, Issue 6 (September 2019) , p. 3748-3767  
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Articles : 39 registres trobats   1 - 10següentfinal  anar al registre:
Documents de recerca 1 registres trobats  
1.
32 p, 619.7 KB Periodic orbits and nonintegrability of the Henon-Heiles Hamiltonian systems / Lembarki, Fatima Ezzahra ; Llibre, Jaume, dir. (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Universitat Autònoma de Barcelona. Departament de Matemàtiques
Dans la nature et dans la vie des hommes, de nombreux processus, sont en constante évolution. Nous parlons donc de systèmes dynamiques. Généralement ces changements incessants sont souvent difficiles à prédire et modéliser car ils surviennent de manière non linéaire et n'obéissent pas pleinement aux simples lois du hasard.
2011  
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