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Dipòsit Digital de Documents de la UAB 25 registres trobats  anterior11 - 20següent  anar al registre: La cerca s'ha fet en 0.00 segons. 
11.
5 p, 936.0 KB Mechanical properties of particles from the surface of asteroid 25143 Itokawa / Tanbakouei, Safoura (Institut d'Estudis Espacials de Catalunya) ; Trigo Rodríguez, Josep Maria (Institut d'Estudis Espacials de Catalunya) ; Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ; Michel, Patrick (Centre National de la Recherche Scientifique (França)) ; Blum, Jürgen (Technische Universität Braunschweig. Institut für Geophysik und extraterrestrische Physik (Germany)) ; Nakamura, Tomoki (Tohoku University. Department of Earth Science (Japan)) ; Williams, Iwan (Queen Mary University of London. School of Physics and Astronomy)
Aims. Asteroids have been exposed to impacts since their formation, and as a consequence their surfaces are covered by small particles, pebbles, and boulders. The Japanese JAXA/ISAS Hayabusa mission collected micron-sized particles from the regolith of asteroid 25143 Itokawa. [...]
2019 - 10.1051/0004-6361/201935380
Astronomy & astrophysics, Vol. 629 (September 2019) , art. A119  
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12.
11 p, 670.2 KB Periodic orbits of the two fixed centers problem with a variational gravitational field / Gao, Fabao (Yangzhou University. School of Mathematical Science (China)) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Within a given range of energy levels the two fixed centers problem under a variational gravitational field admits periodic orbits bifurcating from the Kepler problem. The analytical expressions of these periodic orbits are given when the mass parameter of the system is sufficiently small.
2020 - 10.1007/s10569-020-09979-z
Celestial Mechanics and Dynamical Astronomy, Vol. 132, Issue 6-7 (June 2020) , art. 39  
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13.
24 p, 17.4 MB Magnetic fields in M dwarfs from the CARMENES survey / Shulyak, D. (Göttingen Universität. Institut fur Astrophysik) ; Reiners, A. (Max-Planck-Institute fur Sonnensystemforschung) ; Nagel, E. (Hamburger Sternwarte) ; Tal-Or, L. (Tel Aviv University. Department of Geophysics) ; Caballero, J. A. (Centro de Astrobiología (Madrid)) ; Zechmeister, M. (Göttingen Universität. Institut fur Astrophysik) ; Béjar, V. J. S. (Instituto de Astrofísica de Canarias) ; Cortés-Contreras, M. (Centro de Astrobiología (Madrid)) ; Martin, E. L. (Centro de Astrobiología (Madrid)) ; Kaminski, A. (Zentrum fur Astronomie der Universität Heidelberg) ; Ribas, Ignasi (Institut de Ciències de l'Espai) ; Quirrenbach, A. (Zentrum fur Astronomie der Universität Heidelberg) ; Amado, P. J. (Instituto de Astrofísica de Andalucía) ; Anglada-Escude, Guillem (Queen Mary University of London) ; Bauer, F. F. (Instituto de Astrofísica de Andalucía) ; Dreizler, S. (Göttingen Universität. Institut fur Astrophysik) ; Guenther, E. W. (Thüringer Landessternwarte Tautenburg) ; Henning, T. (Max-Planck-Institut fur Astronomie) ; Jeffers, S. V. (Göttingen Universität. Institut fur Astrophysik) ; Kürster, M. (Max-Planck-Institut fur Astronomie) ; Lafarga Magro, Marina (Institut de Ciències de l'Espai) ; Montes, D. (Universidad Complutense de Madrid. Departamento de Física de la Tierra y Astrofísica) ; Morales, J. C. (Institut de Ciències de l'Espai) ; Pedraz, S. (Centro Astronómico Hispano-Alemán)
Context. M dwarfs are known to generate the strongest magnetic fields among main-sequence stars with convective envelopes, but we are still lacking a consistent picture of the link between the magnetic fields and underlying dynamo mechanisms, rotation, and activity. [...]
2019 - 10.1051/0004-6361/201935315
Astronomy & astrophysics, Vol. 626 (June 2019) , art. A86  
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14.
10 p, 419.0 KB A family of stacked central configurations in the planar five-body problem / Cornelio, J. Lino (Universidad Juárez Autónoma de Tabasco (Mèxic). División Académica de Ciencias Básicas) ; Álvarez-Ramírez, Martha (Universidad Autónoma Metropolitana-Iztapalapa (Mèxic). Departamento de Matemáticas) ; Cors Iglesias, Josep Maria (Universitat Politècnica de Catalunya. Departament de Matemàtiques)
We study planar central configurations of the five-body problem where three bodies, m1,m2 and m3, are collinear and ordered from left to right, while the other two, m4 and m5, are placed symmetrically with respect to the line containing the three collinear bodies. [...]
2017 - 10.1007/s10569-017-9782-8
Celestial Mechanics and Dynamical Astronomy, Vol. 129, Issue 3 (November 2017) , p. 321-328  
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15.
12 p, 828.1 KB Global dynamics of the integrable Armbruster-Guckenheimer-Kim galactic potential / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemática)
We study the global dynamics of the completely integrable Armbruster-Guckenheimer-Kim galactic potential. In these cases this system has two first integrals H1 and H2 independent and in involution. Let Ih1 and Ih2 be the set of points of the phase space on which H1 and H2 take the values h1 and h2, respectively. [...]
2019 - 10.1007/s10509-019-3624-y
Astrophysics and Space Science. An International Journal of Astronomy, Astrophysics and Space Science, Vol. 364, Issue 8 (August 2019) , art. 130  
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16.
22 p, 1.8 MB Global dynamics of the Buckingham's two-body problem / Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade de Lisboa. Instituto Superior Técnico. Departamento de Matemática) ; Vidal, Claudio (Universidad del Bío-Bío. Departamento de Matemática. Grupo de Investigación en Sistemas Dinámicos y Aplicaciones - GISDA (Chile))
The equations of motion of the Buckingham system are the ones of a two-body problem defined by the Hamiltonian H=12(px2+py2)+Ae−Bx2+y2−M(x2+y2)3, where A, B and M are positive constants. The angular momentum p: = xp− yp and this Hamiltonian are two independent first integrals in involution. [...]
2018 - 10.1007/s10509-018-3475-y
Astrophysics and Space Science. An International Journal of Astronomy, Astrophysics and Space Science, Vol. 363, Issue 12 (December 2018) , art. 255  
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17.
31 p, 6.8 MB Numerical study of the geometry of the phase space of the augmented Hill three-body problem / Farrés, Ariadna (Universitat de Barcelona. Institut de Matemàtiques) ; Jorba, Àngel (Universitat de Barcelona. Departament de Matemàtiques i Informàtica) ; Mondelo González, José María (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The Augmented Hill Three-Body problem is an extension of the classical Hill problem that, among other applications, has been used to model the motion of a solar sail around an asteroid. This model is a 3 degrees of freedom (3DoF) Hamiltonian system that depends on four parameters. [...]
2017 - 10.1007/s10569-017-9762-z
Celestial Mechanics and Dynamical Astronomy, 2017  
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18.
24 p, 2.5 MB Spatial collinear restricted 4-body problem with repulsive Manev potential / Barrabés Vera, Esther (Universitat de Girona. Departament d'Informàtica, Matemàtica Aplicada i Estadística) ; Cors Iglesias, Josep Maria (Universitat Politècnica de Catalunya. Departament de Matemàtiques) ; Vidal, Claudio (Universidad del Bío-Bío (Xile). Departament de Matemática)
We outlines some aspects of the dynamics of an infinitesimal mass under the Newtonian attraction of three point masses in a symmetric collinear relative equilibria configuration when a repulsive Manev potential (-1/r e/r^2), e > 0, is applied to the central mass. [...]
2017 - 10.1007/s10569-017-9771-y
Celestial Mechanics & Dynamical Astronomy. An International Journal of Space Dynamics, 2017, p. 1-24  
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19.
28 p, 723.4 KB Periodic orbits of perturbed elliptic oscillators in 6D via averaging theory / Lembarki, Fatima Ezzahra (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We provide sufficient conditions on the energy levels to guarantee the existence of periodic orbits for the perturbed elliptic oscillators in 6D using the averaging theory. We give also an analytical estimation of the shape of these periodic orbits parameterized by the energy. [...]
2016 - 10.1007/s10509-016-2930-x
Astrophysics and Space Science. An International Journal of Astronomy, Astrophysics and Space Science, 2016, p. 361-340  
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20.
23 p, 689.0 KB Periodic motion in perturbed elliptic oscillators revisited / Corbera Subirana, Montserrat (Universitat de Vic. Departament de Tecnologies Digitals i de la Informació) ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Valls, Clàudia 1973- (Universidade Técnica de Lisboa. Departamento de Matemática)
We analytically study the Hamiltonian system in R^4 with Hamiltonian H= 12 (p_x^2 p_y^2) 12 (_1^2 x^2 _2^2 y^2)- V_1(x,y) being (a) V_1(x,y)=-(xy^2 ax^3) and (b) V_1(x,y)=-(x^2y ax^3) with aR, where is a small parameter and _1 and _2 are the unperturbed frequencies of the oscillations along the x and y axis, respectively. [...]
2016 - 10.1007/s10509-016-2927-5
Astrophysics and Space Science. An International Journal of Astronomy, Astrophysics and Space Science, Vol. 361:348 (2016) , p. 1-8  
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