DSpace Collection:
http://hdl.handle.net/2117/3919
Sun, 29 Mar 2015 07:48:35 GMT2015-03-29T07:48:35Zwebmaster.bupc@upc.eduUniversitat Politècnica de Catalunya. Servei de Biblioteques i DocumentaciónoOn the formulation of closest-point projection algorithms in elastoplasticity. Part II: Globally convergent schemes. With applications to deviatoric and pressure-dependent plastic models.
http://hdl.handle.net/2117/26972
Title: On the formulation of closest-point projection algorithms in elastoplasticity. Part II: Globally convergent schemes. With applications to deviatoric and pressure-dependent plastic models.
Authors: Pérez Foguet, Agustí; Armero, Francisco
Description: Report UCB/SEMM 2000-02 - Dept. of Civil Engineering - University of California at Berkeley, USATue, 24 Mar 2015 11:41:44 GMThttp://hdl.handle.net/2117/269722015-03-24T11:41:44ZPérez Foguet, Agustí; Armero, FrancisconoMetas e indicadores post 2015 en agua y saneamiento: una revisión desde un enfoque de derechos humanos
http://hdl.handle.net/2117/26971
Title: Metas e indicadores post 2015 en agua y saneamiento: una revisión desde un enfoque de derechos humanos
Authors: Pérez Foguet, Agustí; Flores Baquero, Óscar; Giné Garriga, Ricard; Jiménez Fernández de Palencia, AlejandroTue, 24 Mar 2015 11:32:53 GMThttp://hdl.handle.net/2117/269712015-03-24T11:32:53ZPérez Foguet, Agustí; Flores Baquero, Óscar; Giné Garriga, Ricard; Jiménez Fernández de Palencia, AlejandronoA note on symplectic and Poisson linearization of semisimple Lie algebra actions
http://hdl.handle.net/2117/26960
Title: A note on symplectic and Poisson linearization of semisimple Lie algebra actions
Authors: Miranda Galcerán, Eva
Abstract: In this note we prove that an analytic symplectic action of a semisimple Lie algebra can be locally linearized in Darboux coordinates. This result yields simultaneous analytic linearization for Hamiltonian vector fields in a neighbourhood of a common zero. We also provide an example of smooth non-linearizable Hamiltonian action with semisimple linear part. The smooth analogue only holds if the semisimple Lie algebra is of compact type. An analytic equivariant b-Darboux theorem for b-Poisson manifolds and an analytic equivariant Weinstein splitting theorem for general Poisson manifolds are also obtained in the Poisson settingMon, 23 Mar 2015 16:46:48 GMThttp://hdl.handle.net/2117/269602015-03-23T16:46:48ZMiranda Galcerán, EvanoIn this note we prove that an analytic symplectic action of a semisimple Lie algebra can be locally linearized in Darboux coordinates. This result yields simultaneous analytic linearization for Hamiltonian vector fields in a neighbourhood of a common zero. We also provide an example of smooth non-linearizable Hamiltonian action with semisimple linear part. The smooth analogue only holds if the semisimple Lie algebra is of compact type. An analytic equivariant b-Darboux theorem for b-Poisson manifolds and an analytic equivariant Weinstein splitting theorem for general Poisson manifolds are also obtained in the Poisson settingNon-integrability of measure preserving maps via Lie symmetries
http://hdl.handle.net/2117/26843
Title: Non-integrability of measure preserving maps via Lie symmetries
Authors: Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor
Abstract: We consider the problem of characterizing, for certain natural
number m, the local C^m-non-integrability near
elliptic fixed points of smooth planar measure preserving maps. Our
criterion relates this non-integrability with the existence of some
Lie Symmetries associated to the maps, together with the study of
the finiteness of its periodic points. One of the steps in the proof
uses the regularity of the period function on the whole period
annulus for non-degenerate centers, question that we believe that is
interesting by itself. The obtained criterion can be applied to
prove the local non-integrability of the Cohen map and of several
rational maps coming from second order difference equations.
Description: Preprint.Thu, 19 Mar 2015 12:49:35 GMThttp://hdl.handle.net/2117/268432015-03-19T12:49:35ZCima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, VíctornoIntegrability and non-integrability of
maps, Measure preserving maps, Lie symmetries, Integrable vector
fields, Period function, Isochronous centers, Cohen map, Difference
equations.We consider the problem of characterizing, for certain natural
number m, the local C^m-non-integrability near
elliptic fixed points of smooth planar measure preserving maps. Our
criterion relates this non-integrability with the existence of some
Lie Symmetries associated to the maps, together with the study of
the finiteness of its periodic points. One of the steps in the proof
uses the regularity of the period function on the whole period
annulus for non-degenerate centers, question that we believe that is
interesting by itself. The obtained criterion can be applied to
prove the local non-integrability of the Cohen map and of several
rational maps coming from second order difference equations.Internal report. Numerical methods for medium scale traveling ionospheric disturbances signal pre-processing
http://hdl.handle.net/2117/26832
Title: Internal report. Numerical methods for medium scale traveling ionospheric disturbances signal pre-processing
Authors: Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel
Abstract: In this paper we discuss the e ects of several signal preprocessing
methods for enhancing the Medium Scale Traveling Ionospheric Dis-
turbances (MSTIDs) signal. The MSTIDs signal are the ionospheric
signatures of waves with a typical scale variation from 50 to 300 m/s,
which can be detected and modeled from variation of the ionospheric
Vertical Total Electron Content (VTEC) with dual-frequency mea-
surements of Global Navigation Satellite Systems (GNSS). In order to
enhance the useful information of the signal, and also reduce the noise,
we purpose the use of di erent numerical methods for preprocessing
the MSTIDs signal. A rst approach to preprocessing the signal is
a simple high-pass ltering or Slant Total Electron Content (STEC)
detrending of the ionospheric carrier phase LI [see Hernndez-Pajares
et al. 2006, Hernndez-Pajares et al. 2012]. In this work, we propose
the following signal processing steps in order to enhance the signal:
(1) Parabolic subtraction adopted in eliminating the typical geometric
length variation within the ionosphere carrier phase LI, (2) decima-
tion techniques used to instead of classic STEC detrending method,
(3) low pass ltering adapted to the properties of the desired signal.
From the results by testing the observing data on the day 1, 2011
obtained from the small area GNSS network in California, it's shown
that the MSTIDs signal after preprocessing techniques are more clear,
smooth and robust.Thu, 19 Mar 2015 11:17:45 GMThttp://hdl.handle.net/2117/268322015-03-19T11:17:45ZYang, Heng; Monte Moreno, Enrique; Hernández Pajares, ManuelnoMedium Scale Traveling Ionospheric Disturbances, signal processing, GNSS, filtering, non-linear processingIn this paper we discuss the e ects of several signal preprocessing
methods for enhancing the Medium Scale Traveling Ionospheric Dis-
turbances (MSTIDs) signal. The MSTIDs signal are the ionospheric
signatures of waves with a typical scale variation from 50 to 300 m/s,
which can be detected and modeled from variation of the ionospheric
Vertical Total Electron Content (VTEC) with dual-frequency mea-
surements of Global Navigation Satellite Systems (GNSS). In order to
enhance the useful information of the signal, and also reduce the noise,
we purpose the use of di erent numerical methods for preprocessing
the MSTIDs signal. A rst approach to preprocessing the signal is
a simple high-pass ltering or Slant Total Electron Content (STEC)
detrending of the ionospheric carrier phase LI [see Hernndez-Pajares
et al. 2006, Hernndez-Pajares et al. 2012]. In this work, we propose
the following signal processing steps in order to enhance the signal:
(1) Parabolic subtraction adopted in eliminating the typical geometric
length variation within the ionosphere carrier phase LI, (2) decima-
tion techniques used to instead of classic STEC detrending method,
(3) low pass ltering adapted to the properties of the desired signal.
From the results by testing the observing data on the day 1, 2011
obtained from the small area GNSS network in California, it's shown
that the MSTIDs signal after preprocessing techniques are more clear,
smooth and robust.Internal report. Solving mixed integer non-linear programming problem applied to GNSS data
http://hdl.handle.net/2117/26831
Title: Internal report. Solving mixed integer non-linear programming problem applied to GNSS data
Authors: Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel
Abstract: The purpose of this paper is to characterize Medium Scale Trav-
eling Ionospheric Disturbances (MSTIDs), by means of Mixed Integer
Nonlinear Programming (MINLP). The MINLP techniques are used
to for estimating the parameters of the equations that describe the
MSTIDs from a set of observations. A new MSTIDs wave detecting
method, which we will denote as Ambiguity Resolution in Global Navi-
gational Satellite System (GNSS) Ionospheric Interferometry (ARGII)
technique, is designed to model the MSTIDs wave with the data from
the wide low-density GNSS receivers network. The ARGII techniques
can be set as an special instance of MINLP, because the problem is set
as a series of MSTIDs equations including the unknown wave veloc-
ity (continuous) and cycle ambiguities (integers). The performance of
heuristic and direct search optimization algorithms are evaluated by
solving the MINLP problem with techniques bared an di erent prin-
ciples, and as benchmark we use the solution obtained by exhaustive
enumeration of all possible integer solutions. Among the algorithms
we have implemented in this work are genetic algorithm, simulated
annealing, particle swarm, pattern search and Nelder Mead methods.
The GNSS data used to test the these solvers is observed from the wide
GNSS network in the north of Poland on the day 353, 2013 whose di-
ameter is more than the half of wavelength and therefore will have
phase ambiguities. The evaluating experiments show that the results
computed by the simple improved optimization algorithms especially
the Nelder Mead have not only high correlations with the reference
method (i.e. exhaustive enumeration) but also extremely lower time
complexity compared to the benchmark method. Despite unguaran-
teed global optimal results for the MINLP problems, these methods
show the excellent performance in time complexity when computing
the velocities of MSTIDs with ARGII techniques from large quantity
of the GNSS data.
Description: Internal ReportThu, 19 Mar 2015 11:14:49 GMThttp://hdl.handle.net/2117/268312015-03-19T11:14:49ZYang, Heng; Monte Moreno, Enrique; Hernández Pajares, ManuelnoMixed Integer Nonlinear Programming, Medium Scale Traveling Ionospheric Disturbances, GNSS, genetic algorithms, simulated annealing, particle swarm algorithms, pattern search algorithm, Nelder Mead algorithmThe purpose of this paper is to characterize Medium Scale Trav-
eling Ionospheric Disturbances (MSTIDs), by means of Mixed Integer
Nonlinear Programming (MINLP). The MINLP techniques are used
to for estimating the parameters of the equations that describe the
MSTIDs from a set of observations. A new MSTIDs wave detecting
method, which we will denote as Ambiguity Resolution in Global Navi-
gational Satellite System (GNSS) Ionospheric Interferometry (ARGII)
technique, is designed to model the MSTIDs wave with the data from
the wide low-density GNSS receivers network. The ARGII techniques
can be set as an special instance of MINLP, because the problem is set
as a series of MSTIDs equations including the unknown wave veloc-
ity (continuous) and cycle ambiguities (integers). The performance of
heuristic and direct search optimization algorithms are evaluated by
solving the MINLP problem with techniques bared an di erent prin-
ciples, and as benchmark we use the solution obtained by exhaustive
enumeration of all possible integer solutions. Among the algorithms
we have implemented in this work are genetic algorithm, simulated
annealing, particle swarm, pattern search and Nelder Mead methods.
The GNSS data used to test the these solvers is observed from the wide
GNSS network in the north of Poland on the day 353, 2013 whose di-
ameter is more than the half of wavelength and therefore will have
phase ambiguities. The evaluating experiments show that the results
computed by the simple improved optimization algorithms especially
the Nelder Mead have not only high correlations with the reference
method (i.e. exhaustive enumeration) but also extremely lower time
complexity compared to the benchmark method. Despite unguaran-
teed global optimal results for the MINLP problems, these methods
show the excellent performance in time complexity when computing
the velocities of MSTIDs with ARGII techniques from large quantity
of the GNSS data.Internal report. Spectral methods for time delay estimation of MSTIDs signal
http://hdl.handle.net/2117/26830
Title: Internal report. Spectral methods for time delay estimation of MSTIDs signal
Authors: Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel
Abstract: The primary goal of this work is to summarize spectral meth-
ods to estimate the time delay variations of the detrended Medium
Scale Traveling Ionospheric Disturbances (MSTIDs) signals and pre-
liminarily discuss the potential infuence of the Doppler e fects. The
MSTIDs signals are assumed as the planar waves with the wavelength
between 10-100 kilometers, which are measured from a local high-
dense receivers Global Navigation Satellite System (GNSS) network
for a given satellite. The signals show strong correlation with each
others in the whole observation time series. The time delay of the
detrended MSTIDs signals preprocessed with a speci c overlapped
sliding window can be estimated by several techniques. The data con-
sisted on two detrended MSTIDs signals measured from the GNSS
data on the day 1, 2011 obtained from the small area network in Cal-
ifornia. In this paper we have implemented the following methods
in order to estimate the time delay between signals: (1) Generalized
cross correlation method, which estimates the time delay in time do-
main after the inverse Fourier transform of appropriately weighted
cross power spectrum density, (2) generalized phase spectrum method
directly measured from the appropriately weighted cross power spec-
trum density, (3) phase spectrum di erence method calculated ap-
proximately from the fundamental waves of the signals. The results
with di erent methods show the similar variation of time delay of two
MSTIDs signals. In addition, with the phase spectrum method, the
results can present the clear frequency variation of MSTIDs signals
which may be in
uenced by potential Doppler e ect. Note that the
correct estimate of the delays required of a preprocessing of the data.
The rst di erence of the Vertical Total Electron Contents (dVTEC)
signal was preprocessed by modeling the e ect of the displacement of
the satellite by means of a parabolic component, which is subtracted,
following by detrend of 60-second intervals, decimation and a further
low pass ltering process.
Description: Internal ReportThu, 19 Mar 2015 11:11:03 GMThttp://hdl.handle.net/2117/268302015-03-19T11:11:03ZYang, Heng; Monte Moreno, Enrique; Hernández Pajares, ManuelnoMedium Scale Traveling Ionospheric Disturbances, signal processing, spectral methods, time delay estimation, GNSSThe primary goal of this work is to summarize spectral meth-
ods to estimate the time delay variations of the detrended Medium
Scale Traveling Ionospheric Disturbances (MSTIDs) signals and pre-
liminarily discuss the potential infuence of the Doppler e fects. The
MSTIDs signals are assumed as the planar waves with the wavelength
between 10-100 kilometers, which are measured from a local high-
dense receivers Global Navigation Satellite System (GNSS) network
for a given satellite. The signals show strong correlation with each
others in the whole observation time series. The time delay of the
detrended MSTIDs signals preprocessed with a speci c overlapped
sliding window can be estimated by several techniques. The data con-
sisted on two detrended MSTIDs signals measured from the GNSS
data on the day 1, 2011 obtained from the small area network in Cal-
ifornia. In this paper we have implemented the following methods
in order to estimate the time delay between signals: (1) Generalized
cross correlation method, which estimates the time delay in time do-
main after the inverse Fourier transform of appropriately weighted
cross power spectrum density, (2) generalized phase spectrum method
directly measured from the appropriately weighted cross power spec-
trum density, (3) phase spectrum di erence method calculated ap-
proximately from the fundamental waves of the signals. The results
with di erent methods show the similar variation of time delay of two
MSTIDs signals. In addition, with the phase spectrum method, the
results can present the clear frequency variation of MSTIDs signals
which may be in
uenced by potential Doppler e ect. Note that the
correct estimate of the delays required of a preprocessing of the data.
The rst di erence of the Vertical Total Electron Contents (dVTEC)
signal was preprocessed by modeling the e ect of the displacement of
the satellite by means of a parabolic component, which is subtracted,
following by detrend of 60-second intervals, decimation and a further
low pass ltering process.On the formulation of closest-point projection algorithms in elastoplasticity. Part I: The variational structure.
http://hdl.handle.net/2117/26702
Title: On the formulation of closest-point projection algorithms in elastoplasticity. Part I: The variational structure.
Authors: Armero, Francisco; Pérez Foguet, Agustí
Abstract: We present in this paper the characterization of the variational structure behind the discrete equa- tions defining the closest-point projection approximation in elastoplasticity. Rate-independent and viscoplastic formulations are considered in the infinitesimal and the finite deformation range, the later in the context of isotropic finite strain multiplicative plasticity. Primal variational prin- ciples in terms of the stresses and stress-like hardening variables are presented first, followed by the formulation of dual principles incorporating explicitly the plastic multiplier. Augmented La- grangian extensions are also presented allowing a complete regularization of the problem in the constrained rate-independent limit. The variational structure identified in this paper leads to the proper framework for the development of new improved numerical algorithms for the integration of the local constitutive equations of plasticity as it is undertaken in Part II of this work.
Description: Report UCB/SEMM 2000-01 - Dept. of Civil Engineering - University of California at Berkeley, USAFri, 13 Mar 2015 14:33:35 GMThttp://hdl.handle.net/2117/267022015-03-13T14:33:35ZArmero, Francisco; Pérez Foguet, AgustínoWe present in this paper the characterization of the variational structure behind the discrete equa- tions defining the closest-point projection approximation in elastoplasticity. Rate-independent and viscoplastic formulations are considered in the infinitesimal and the finite deformation range, the later in the context of isotropic finite strain multiplicative plasticity. Primal variational prin- ciples in terms of the stresses and stress-like hardening variables are presented first, followed by the formulation of dual principles incorporating explicitly the plastic multiplier. Augmented La- grangian extensions are also presented allowing a complete regularization of the problem in the constrained rate-independent limit. The variational structure identified in this paper leads to the proper framework for the development of new improved numerical algorithms for the integration of the local constitutive equations of plasticity as it is undertaken in Part II of this work.Metas e indicadores post 2015 en agua y saneamiento: una revisión desde un enfoque de derechos humanos
http://hdl.handle.net/2117/26633
Title: Metas e indicadores post 2015 en agua y saneamiento: una revisión desde un enfoque de derechos humanos
Authors: Flores Baquero, Óscar; Giné Garriga, Ricard; Pérez Foguet, Agustí; Jiménez Fernández de Palencia, Alejandro
Description: Informe tècnicMon, 09 Mar 2015 13:45:22 GMThttp://hdl.handle.net/2117/266332015-03-09T13:45:22ZFlores Baquero, Óscar; Giné Garriga, Ricard; Pérez Foguet, Agustí; Jiménez Fernández de Palencia, AlejandronoPost-2015 WASH targets and indicators: a review from a Human Rights Perspective
http://hdl.handle.net/2117/26632
Title: Post-2015 WASH targets and indicators: a review from a Human Rights Perspective
Authors: Flores Baquero, Óscar; Giné Garriga, Ricard; Pérez Foguet, Agustí; Jiménez Fdez de Palencia, Alejandro
Description: Informe tècnicMon, 09 Mar 2015 13:40:53 GMThttp://hdl.handle.net/2117/266322015-03-09T13:40:53ZFlores Baquero, Óscar; Giné Garriga, Ricard; Pérez Foguet, Agustí; Jiménez Fdez de Palencia, AlejandronoApplications of numerical differentiation to computational plasticity
http://hdl.handle.net/2117/26511
Title: Applications of numerical differentiation to computational plasticity
Authors: Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio
Description: Report del Departament de Matemàtica Aplicada III - MA010Wed, 25 Feb 2015 13:30:29 GMThttp://hdl.handle.net/2117/265112015-02-25T13:30:29ZPérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonionofinite element method, consistent tangent operators, difference scheme, flow vector, flow potential, quadratic convergenceModeling microwave drying of soils
http://hdl.handle.net/2117/26510
Title: Modeling microwave drying of soils
Authors: Pérez Foguet, Agustí; Huerta, Antonio
Description: Report del Departament de Matemàtica Aplicada III - MA009Wed, 25 Feb 2015 13:23:57 GMThttp://hdl.handle.net/2117/265102015-02-25T13:23:57ZPérez Foguet, Agustí; Huerta, Antonionosoil drying, microwave, suction, mathematical model, numerical simulationSingular solutions for a class of traveling wave equations arising in hydrodynamics
http://hdl.handle.net/2117/26450
Title: Singular solutions for a class of traveling wave equations arising in hydrodynamics
Authors: Geyer, Anna; Mañosa Fernández, Víctor
Abstract: We give an exhaustive characterization of singular weak solutions for ordinary
differential equations of the form $\ddot{u}\,u +
\frac{1}{2}\dot{u}^2 + F'(u) =0$, where $F$ is an analytic function.
Our motivation stems from the fact that in the context of hydrodynamics several
prominent equations are reducible to an equation of this form
upon passing to a moving frame. We construct peaked and cusped waves,
fronts with finite-time decay and compact solitary waves. We prove
that one cannot obtain peaked and compactly supported traveling waves for the
same equation. In particular, a peaked traveling wave cannot have compact
support and vice versa. To exemplify the approach we apply our
results to the Camassa-Holm equation and the equation for surface waves
of moderate amplitude, and show how the different types of singular solutions
can be obtained varying the energy level of the corresponding planar Hamiltonian systems.
Description: PreprintFri, 20 Feb 2015 13:24:49 GMThttp://hdl.handle.net/2117/264502015-02-20T13:24:49ZGeyer, Anna; Mañosa Fernández, VíctornoCamassa-Holm equation, integrable vector fields, singular ordinary differential equations, traveling waves.We give an exhaustive characterization of singular weak solutions for ordinary
differential equations of the form $\ddot{u}\,u +
\frac{1}{2}\dot{u}^2 + F'(u) =0$, where $F$ is an analytic function.
Our motivation stems from the fact that in the context of hydrodynamics several
prominent equations are reducible to an equation of this form
upon passing to a moving frame. We construct peaked and cusped waves,
fronts with finite-time decay and compact solitary waves. We prove
that one cannot obtain peaked and compactly supported traveling waves for the
same equation. In particular, a peaked traveling wave cannot have compact
support and vice versa. To exemplify the approach we apply our
results to the Camassa-Holm equation and the equation for surface waves
of moderate amplitude, and show how the different types of singular solutions
can be obtained varying the energy level of the corresponding planar Hamiltonian systems.Lie symmetries of birational maps preserving genus 0 fibrations
http://hdl.handle.net/2117/26449
Title: Lie symmetries of birational maps preserving genus 0 fibrations
Authors: Llorens, Mireia; Mañosa Fernández, Víctor
Abstract: We prove that any planar birational integrable map, which preserves
a fibration given by genus $0$ curves has a Lie symmetry and some
associated invariant measures. The obtained results allow to study
in a systematic way the global dynamics of these maps. Using this
approach, the dynamics of several maps is described. In particular
we are able to give, for particular examples, the explicit
expression of the rotation number function, and the set of periods
of the considered maps.
Description: Preprint.Fri, 20 Feb 2015 12:54:58 GMThttp://hdl.handle.net/2117/264492015-02-20T12:54:58ZLlorens, Mireia; Mañosa Fernández, VíctornoIntegrable maps, Lie symmetries, Periodic
orbits, Rational parameterizations.We prove that any planar birational integrable map, which preserves
a fibration given by genus $0$ curves has a Lie symmetry and some
associated invariant measures. The obtained results allow to study
in a systematic way the global dynamics of these maps. Using this
approach, the dynamics of several maps is described. In particular
we are able to give, for particular examples, the explicit
expression of the rotation number function, and the set of periods
of the considered maps.Action-angle variables and a KAM theorem for b-Poisson manifolds
http://hdl.handle.net/2117/26390
Title: Action-angle variables and a KAM theorem for b-Poisson manifolds
Authors: Kiesenhofer, Anna; Miranda Galcerán, Eva; Scott, Geoffrey
Abstract: In this article we prove an action-angle theorem for b-integrable systems on b-Poisson manifolds improving the action-angle theorem contained in [LMV11] for general Poisson manifolds in this setting. As an application, we prove a KAM-type theorem for b-Poisson manifolds.Tue, 17 Feb 2015 12:12:30 GMThttp://hdl.handle.net/2117/263902015-02-17T12:12:30ZKiesenhofer, Anna; Miranda Galcerán, Eva; Scott, GeoffreynoIn this article we prove an action-angle theorem for b-integrable systems on b-Poisson manifolds improving the action-angle theorem contained in [LMV11] for general Poisson manifolds in this setting. As an application, we prove a KAM-type theorem for b-Poisson manifolds.