Browsing by Subject "Física matemàtica"
Now showing items 21-40 of 72
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Geometric Quantization of real polarizations via sheaves
(2013-01)
Research report
Open AccessIn this article we develop tools to compute the Geometric Quantization of a symplectic manifold with respect to a regular Lagrangian foliation via sheaf cohomology. The starting point is the definition of representation ... -
Geometrical structures of higher-order dynamical systems and field theories
(Universitat Politècnica de Catalunya, 2014-10-02)
Doctoral thesis
Open AccessGeometrical physics is a relatively young branch of applied mathematics that was initiated by the 60's and the 70's when A. Lichnerowicz, W.M. Tulczyjew and J.M. Souriau, among many others, began to study various topics ... -
Global analysis of direct transfers from lunar orbits to sun-earth libration point regimes
(Springer Nature, 2021-04-01)
Article
Open AccessIn this paper we look forward to obtain a global picture of simple transfer opportunities from Lunar to Sun-Earth libration orbits, useful for a preliminary design of these mission scenarios. Considering the trajectory of ... -
Gravitational Particle Production in Massive Chaotic Inflation and the Moduli Problem
(2012-02)
Article
Restricted access - publisher's policyParticle production from vacuum fluctuations during inflation is briefly revisited. The moduli problem occurring with light particles produced at the end of inflation is addressed, namely the fact that some results are in ... -
Groupoids and Faà di Bruno formulae for Green functions in bialgebras of trees
(2014)
Article
Restricted access - publisher's policyWe prove a Faà di Bruno formula for the Green function in the bialgebra of P-trees, for any polynomial endofunctor P. The formula appears as relative homotopy cardinality of an equivalence of groupoids. -
Groupoids and Faà di Bruno Formulae for green functions in bialgebras of trees
(2012-07)
Research report
Open AccessWe prove a Faa di Bruno formula for the Green function in the bialgebra of P-trees, for any polynomial endofunctor P. The formula appears as relative homotopy cardinality of an equivalence of groupoids. For suitable choices ... -
GSAC - One proposal of ISL frequencies for potential Galileo modernization with Intersatellite Links ISL double benefit on GNSS satellite orbits- clocks improvement and ionospheric tomography: What , Why & How
(2014-05-28)
Research report
Restricted access - confidentiality agreement -
GSAC - Some considerations on potential scientific applications of GNSS Inter-Satellite Links (ISL)
(2014-05-28)
Research report
Restricted access - confidentiality agreement -
GSAC - Some considerations on potential scientific applications of GNSS Inter-Satellite Links (ISL) presentation
(2013-12-03)
Research report
Restricted access - confidentiality agreement -
Heterogenous mean-field analysis of a generalized voter-like model on networks
(Springer, 2012-03)
Article
Open AccessWe propose a generalized framework for the study of voter models in complex networks at the heterogeneous mean-field (HMF) level that (i) yields a unified picture for existing copy/invasion processes and (ii) allows for ... -
High order dynamical systems approaches for low-thrust station-keeping of libration point orbits
(2022-01-01)
Article
Restricted access - publisher's policyWe derive two families of low-thrust station-keeping control procedures based on the dynamical properties of the phase space near libration point orbits. The first family is obtained as the limit of impulsive maneuvers, ... -
Higher-order mechanics: variational principles and other topics
(American Institute of Mathematical Sciences, 2013-12)
Article
Open AccessAfter reviewing the Lagrangian-Hamiltonian unified formalism (i.e, the Skinner-Rusk formalism) for higher-order (non-autonomous) dynamical systems, we state a unified geometrical version of the Variational Principles which ... -
Impact of higher order ionospheric delay on precise GNSS computation
(2013)
Conference report
Open Access -
Infinitesimal time reparametrisation and its applications
(Springer, 2022-02-21)
Article
Open AccessA geometric approach to Sundman infnitesimal time-reparametrisation is given and some of its applications are used to illustrate the general theory. Special emphasis is put on geodesic motions and systems described by ... -
INSPIRE: DI 1-1 Technical Note with assessment of state-of-the-art of earthquake precursors identification
(2014-12-25)
Research report
Restricted access - confidentiality agreement -
INSPIRE: DI 1-2 Technical Note with definition of methodology for identification of earthquake signatures
(2014-12-25)
Research report
Restricted access - confidentiality agreement -
INSPIRE: DI 2-1 Technical Note describing the design and development of the database with performance criteria
(2015-01-26)
Research report
Restricted access - confidentiality agreement -
Ionosphere/Plasmasphere sounding with ground and space-based GNSS observations
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Open AccessApplying a methodology developed and tested in previous studies, the contribution from the ionospheric and plasmaspheric regions to the total electron content (measured by ground receivers) is analyzed. ... -
Microscopic modelling of the optical properties of 2D perovskites
(Universitat Politècnica de Catalunya, 2020-06)
Bachelor thesis
Open Access
Covenantee: Chalmers tekniska högskolaThis work focuses on the optical properties of a quasi-two-dimensional perovskite. Using the quantum formalism based on the density matrix and the second quantization operators we obtain mathematical expressions for ... -
Modelling shoreface-connected sand ridges observed at the inner shelf of the Ebro delta
(Universitat Politècnica de Catalunya, 2018-06)
Bachelor thesis
Open AccessThe large amount of sand provided by coastal erosion in the river mouth and the combination between high-speed currents induced by Mistral wind and severe wave-storm events might have been the favourable conditions in the ...
