Browsing by Subject "Física matemàtica"
Now showing items 2140 of 76

Factorization of the Fourier transform of the pressurePoisson equation using finite differences in colocated grids
(WileyVCH, 20120229)
Article
Open AccessThe zerodivergence constraint on the velocity field in the numerical simulation of incompressible flows can be reduced, in certain cases, to a set of onedimensional linear difference equations for the pressure. These ... 
Flow computations on imprecise terrains
(Springer Verlag, 2011)
Conference report
Restricted access  confidentiality agreementWe study water flow computation on imprecise terrains. We consider two approaches to modeling flow on a terrain: one where water flows across the surface of a polyhedral terrain in the direction of steepest descent, and ... 
Geometric HamiltonJacobi theory for higherorder autonomous systems
(20130909)
Research report
Open AccessThe geometric framework for the HamiltonJacobi theory is used to study this theory in the ambient of higherorder mechanical systems, both in the Lagrangian and Hamiltonian formalisms. Thus, we state the corresponding ... 
Geometric Quantization of real polarizations via sheaves
(201301)
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 higherorder dynamical systems and field theories
(Universitat Politècnica de Catalunya, 20141002)
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 sunearth libration point regimes
(Springer Nature, 20210401)
Article
Open AccessIn this paper we look forward to obtain a global picture of simple transfer opportunities from Lunar to SunEarth 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
(201202)
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 Ptrees, 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
(201207)
Research report
Open AccessWe prove a Faa di Bruno formula for the Green function in the bialgebra of Ptrees, 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
(20140528)
Research report
Restricted access  confidentiality agreement 
GSAC  Some considerations on potential scientific applications of GNSS InterSatellite Links (ISL)
(20140528)
Research report
Restricted access  confidentiality agreement 
GSAC  Some considerations on potential scientific applications of GNSS InterSatellite Links (ISL) presentation
(20131203)
Research report
Restricted access  confidentiality agreement 
Heterogenous meanfield analysis of a generalized voterlike model on networks
(Springer, 201203)
Article
Open AccessWe propose a generalized framework for the study of voter models in complex networks at the heterogeneous meanfield (HMF) level that (i) yields a unified picture for existing copy/invasion processes and (ii) allows for ... 
High order dynamical systems approaches for lowthrust stationkeeping of libration point orbits
(20220101)
Article
Open AccessWe derive two families of lowthrust stationkeeping 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, ... 
Higherorder mechanics: variational principles and other topics
(American Institute of Mathematical Sciences, 201312)
Article
Open AccessAfter reviewing the LagrangianHamiltonian unified formalism (i.e, the SkinnerRusk formalism) for higherorder (nonautonomous) 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, 20220221)
Article
Open AccessA geometric approach to Sundman infnitesimal timereparametrisation 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 11 Technical Note with assessment of stateoftheart of earthquake precursors identification
(20141225)
Research report
Restricted access  confidentiality agreement 
INSPIRE: DI 12 Technical Note with definition of methodology for identification of earthquake signatures
(20141225)
Research report
Restricted access  confidentiality agreement 
INSPIRE: DI 21 Technical Note describing the design and development of the database with performance criteria
(20150126)
Research report
Restricted access  confidentiality agreement