Capítols de llibre
http://hdl.handle.net/2117/3922
2017-03-28T17:53:49ZOn bifurcations of homoclinic tangencies in area-preserving maps on non-orientable manifolds
http://hdl.handle.net/2117/101963
On bifurcations of homoclinic tangencies in area-preserving maps on non-orientable manifolds
Delshams Valdés, Amadeu; Gonchenko, Marina; Gonchenko, Sergey
We study bifurcations of non-orientable area-preserving maps with quadratic homoclinic tangencies. We study the case when the maps are given on non-orientable two-dimensional manifolds. We consider one and two parameter general unfoldings and establish results related to the appearance of elliptic periodic orbits.
2017-03-06T11:00:45ZDelshams Valdés, AmadeuGonchenko, MarinaGonchenko, SergeyWe study bifurcations of non-orientable area-preserving maps with quadratic homoclinic tangencies. We study the case when the maps are given on non-orientable two-dimensional manifolds. We consider one and two parameter general unfoldings and establish results related to the appearance of elliptic periodic orbits.Data-driven methodologies for structural damage detection based on machine learning applications
http://hdl.handle.net/2117/101068
Data-driven methodologies for structural damage detection based on machine learning applications
Vitola Oyaga, Jaime; Anaya Vejar, Maribel; Tibaduiza Burgos, Diego Alexander; Pozo Montero, Francesc
Structural health monitoring (SHM) is an important research area, which interest is the damage identification process. Different information about the state of the structure can be obtained in the process, among them, detection, localization and classification of damages are mainly studied in order to avoid unnecessary maintenance procedures in civilian and military structures in several applications. To carry out SHM in practice, two different approaches are used, the first is based on modelling which requires to build a very detailed model of the structure, while the second is by means of data-driven approaches which use information collected from the structure under different structural states and perform an analysis by means of data analysis . For the latter, statistical analysis and pattern recognition have demonstrated its effectiveness in the damage identification process because real information is obtained from the structure through sensors installed permanently to the observed object allowing a real-time monitoring. This chapter describes a damage detection and classification methodology, which makes use of a piezoelectric active system which works in several actuation phases and that is attached to the structure under evaluation, principal component analysis, and machine learning algorithms working as a pattern recognition methodology. In the chapter, the description of the developed approach and the results when it is tested in one aluminum plate are also included.
2017-02-15T11:26:05ZVitola Oyaga, JaimeAnaya Vejar, MaribelTibaduiza Burgos, Diego AlexanderPozo Montero, FrancescStructural health monitoring (SHM) is an important research area, which interest is the damage identification process. Different information about the state of the structure can be obtained in the process, among them, detection, localization and classification of damages are mainly studied in order to avoid unnecessary maintenance procedures in civilian and military structures in several applications. To carry out SHM in practice, two different approaches are used, the first is based on modelling which requires to build a very detailed model of the structure, while the second is by means of data-driven approaches which use information collected from the structure under different structural states and perform an analysis by means of data analysis . For the latter, statistical analysis and pattern recognition have demonstrated its effectiveness in the damage identification process because real information is obtained from the structure through sensors installed permanently to the observed object allowing a real-time monitoring. This chapter describes a damage detection and classification methodology, which makes use of a piezoelectric active system which works in several actuation phases and that is attached to the structure under evaluation, principal component analysis, and machine learning algorithms working as a pattern recognition methodology. In the chapter, the description of the developed approach and the results when it is tested in one aluminum plate are also included.Compact Hausdorff group topologies for the additive group of real numbers
http://hdl.handle.net/2117/99723
Compact Hausdorff group topologies for the additive group of real numbers
Bruguera Padró, Mª Montserrat; Martín-Peinador, Elena
This volume contains the contributions presented by several colleagues as a tribute
to the mathematical and human qualities of Jos e Mar a Montesinos Amilibia on the
occasion of his seventieth birthday. The editors would like to express their thanks
to the contributors and their very especial gratitude to Jos e Mar a for his example
through many years of scienti c and personal contact; We deal with an example of a topology for the additive group of real numbers
R, which makes it a compact Hausdor topological group. Further, (R; ) is
connected, but neither arcwise connected, nor locally connected. Thus, it is nei-
ther a Lie group, nor a curve in the sense of H. Mazurkiewicz. The contribution
of this short note is to provide an elementary proof of the fact that it is not
arcwise connected.
2017-01-19T16:53:30ZBruguera Padró, Mª MontserratMartín-Peinador, ElenaThis volume contains the contributions presented by several colleagues as a tribute
to the mathematical and human qualities of Jos e Mar a Montesinos Amilibia on the
occasion of his seventieth birthday. The editors would like to express their thanks
to the contributors and their very especial gratitude to Jos e Mar a for his example
through many years of scienti c and personal contact
We deal with an example of a topology for the additive group of real numbers
R, which makes it a compact Hausdor topological group. Further, (R; ) is
connected, but neither arcwise connected, nor locally connected. Thus, it is nei-
ther a Lie group, nor a curve in the sense of H. Mazurkiewicz. The contribution
of this short note is to provide an elementary proof of the fact that it is not
arcwise connected.“Les matemàtiques i l’enginyeria a la Barcelona del set-cents: les bases de la nova professionalització dels tècnics
http://hdl.handle.net/2117/98200
“Les matemàtiques i l’enginyeria a la Barcelona del set-cents: les bases de la nova professionalització dels tècnics
Roca Rosell, Antoni Maria Claret
2016-12-14T10:59:58ZRoca Rosell, Antoni Maria ClaretEffects of thermoregulation on human sleep patterns: A mathematical model of sleep-wake cycles with REM-NREM subcircuit
http://hdl.handle.net/2117/90841
Effects of thermoregulation on human sleep patterns: A mathematical model of sleep-wake cycles with REM-NREM subcircuit
Bañuelos, Selenne; Best, Janet; Huguet Casades, Gemma; Prieto-Langarica, Alicia; Pyzza, Pamela; Schmidt, Markus; Wilson, Shelby
In this paper we construct a mathematical model of human sleep/wake regulation with thermoregulation and temperature e ects. Simulations of this model show features previously presented in experimental data such as elongation of duration and number of REM bouts across the night as well as the appearance of awakenings due to deviations in body temperature from thermoneutrality. This model helps to demonstrate the importance of temperature in the sleep cycle. Further modi cations of the model to include more temperature e ects on other aspects of sleep regulation such as sleep and REM latency are discussed
2016-10-18T10:52:04ZBañuelos, SelenneBest, JanetHuguet Casades, GemmaPrieto-Langarica, AliciaPyzza, PamelaSchmidt, MarkusWilson, ShelbyIn this paper we construct a mathematical model of human sleep/wake regulation with thermoregulation and temperature e ects. Simulations of this model show features previously presented in experimental data such as elongation of duration and number of REM bouts across the night as well as the appearance of awakenings due to deviations in body temperature from thermoneutrality. This model helps to demonstrate the importance of temperature in the sleep cycle. Further modi cations of the model to include more temperature e ects on other aspects of sleep regulation such as sleep and REM latency are discussedIsometries of the hamming space and equivalence relations of linear codes over a finite field
http://hdl.handle.net/2117/89879
Isometries of the hamming space and equivalence relations of linear codes over a finite field
García Planas, María Isabel; Magret Planas, Maria dels Dolors
Detection and error capabilities are preserved when applying to a linear
code an isomorphism which preserves Hamming distance. We study
here two such isomorphisms: permutation isometries and monomial
isometries
2016-09-13T12:03:34ZGarcía Planas, María IsabelMagret Planas, Maria dels DolorsDetection and error capabilities are preserved when applying to a linear
code an isomorphism which preserves Hamming distance. We study
here two such isomorphisms: permutation isometries and monomial
isometriesPrólogo. Ciencia, doctrina, creencias y profesionalización
http://hdl.handle.net/2117/89873
Prólogo. Ciencia, doctrina, creencias y profesionalización
Roca Rosell, Antoni Maria Claret
2016-09-13T11:02:34ZRoca Rosell, Antoni Maria ClaretMatemáticas y redes
http://hdl.handle.net/2117/86867
Matemáticas y redes
Rué Perna, Juan José; Zumalacárregui, Ana
2016-05-10T11:50:32ZRué Perna, Juan JoséZumalacárregui, AnaEdmund Stone y el estudio y uso de instrumentos matemáticos
http://hdl.handle.net/2117/85558
Edmund Stone y el estudio y uso de instrumentos matemáticos
Blanco Abellán, Mónica
2016-04-12T12:02:31ZBlanco Abellán, MónicaIonospheric model for radio techniques
http://hdl.handle.net/2117/84710
Ionospheric model for radio techniques
Hernández Pajares, Manuel
2016-03-18T14:12:03ZHernández Pajares, Manuel