0000000001001079

AUTHOR

J. A. Oteo

showing 7 related works from this author

Coexistence of periods in a bisecting bifurcation

2011

The inner structure of the attractor appearing when the Varley-Gradwell-Hassell population model bifurcates from regular to chaotic behaviour is studied. By algebraic and geometric arguments the coexistence of a continuum of neutrally stable limit cycles with different periods in the attractor is explained.

Nonlinear Sciences::Chaotic DynamicsFOS: Physical sciencesChaotic Dynamics (nlin.CD)Nonlinear Sciences - Chaotic Dynamics
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Human Immunodeficiency Virus Continuum of Care in 11 European Union Countries at the End of 2016 Overall and by Key Population: Have We Made Progress?

2020

Abstract Background High uptake of antiretroviral treatment (ART) is essential to reduce human immunodeficiency virus (HIV) transmission and related mortality; however, gaps in care exist. We aimed to construct the continuum of HIV care (CoC) in 2016 in 11 European Union (EU) countries, overall and by key population and sex. To estimate progress toward the Joint United Nations Programme on HIV/AIDS (UNAIDS) 90-90-90 target, we compared 2016 to 2013 estimates for the same countries, representing 73% of the population in the region. Methods A CoC with the following 4 stages was constructed: number of people living with HIV (PLHIV); proportion of PLHIV diagnosed; proportion of those diagnosed …

Male0301 basic medicinePsychological interventionHuman immunodeficiency virus (HIV)MedizinContinuum of care; Europe; HIV infection; Key population; Sex; Anti-Retroviral Agents; Continuity of Patient Care; European Union; HIV; Humans; Male; HIV InfectionsHIV InfectionsContinuum of care; Europe; HIV infection; Key population; Sexmedicine.disease_causekey population0302 clinical medicineContinuum of careHIV Infection030212 general & internal medicineMen having sex with menContinuum of caremedia_commoneducation.field_of_study[SDV.MHEP] Life Sciences [q-bio]/Human health and pathologyTransmission (medicine)Continuity of Patient CareEuropeInfectious DiseasesAcademicSubjects/MED00290Anti-Retroviral AgentsHIV infection continuum of care sex key population EuropeSexMicrobiology (medical)PopulationSocio-culturale03 medical and health sciencesAcquired immunodeficiency syndrome (AIDS)SDG 3 - Good Health and Well-beingmedicinemedia_common.cataloged_instanceHumansEuropean UnionEuropean unioneducationPandemicsHIV infection ; continuum of care ; sex ; key population ; Europebusiness.industrySARS-CoV-2COVID-19HIVmedicine.diseaseHIV infectioncontinuum of care030112 virologyMajor Articles and CommentariesKey populationAnti-Retroviral Agentbusiness[SDV.MHEP]Life Sciences [q-bio]/Human health and pathologyDemography
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Driven harmonic oscillators in the adiabatic Magnus approximation

1993

The time evolution of driven harmonic oscillators is determined by applying the Magnus expansion in the basis set of instantaneous eigenstates of the total Hamiltonian. It is shown that the first-order approximation already provides transition probabilities close to the exact values even in the intermediate regime.

Physics[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Time evolution01 natural sciencesAtomic and Molecular Physics and Optics010305 fluids & plasmasAdiabatic theoremsymbols.namesakeClassical mechanicsQuantum harmonic oscillatorMagnus expansionQuantum mechanics0103 physical sciencessymbols010306 general physicsAdiabatic processHamiltonian (quantum mechanics)Eigenvalues and eigenvectorsHarmonic oscillatorPhysical Review A
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Why Magnus expansion

2021

A short story about the origins of Magnus Expansion, why we got involved and how it led us to meet Geometric Integration. We present a biographical draft of Wilhelm Magnus, a sketchy discussion of ...

Geometric integrationComputational Theory and MathematicsApplied MathematicsMagnus expansionCalculusComputer Science ApplicationsMathematicsInternational Journal of Computer Mathematics
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Statistical geometric affinity in human brain electric activity

2007

10 pages, 9 figures.-- PACS nrs.: 87.19.La; 05.45.Tp.-- ISI Article Identifier: 000246890100105

Computer scienceModels NeurologicalNeurophysiologyElectroencephalographyInterpretation (model theory)[PACS] Time series analysis (nonlinear dynamical systems)LacunaritymedicineHumansComputer SimulationDiagnosis Computer-AssistedWakefulnessRepresentation (mathematics)ScalingEvoked PotentialsModels Statisticalmedicine.diagnostic_testbusiness.industry[PACS] Neuroscience (higher organisms)BrainPattern recognitionElectroencephalographyNeurophysiologyAmplitudeStatistical analysisData Interpretation StatisticalBioelectric phenomenaLacunarityAffine transformationArtificial intelligenceSleep StagesbusinessSleep
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Double precision errors in the logistic map: statistical study and dynamical interpretation.

2007

The nature of the round-off errors that occur in the usual double precision computation of the logistic map is studied in detail. Different iterative regimes from the whole panoply of behaviors exhibited in the bifurcation diagram are examined, histograms of errors in trajectories given, and for the case of fully developed chaos an explicit formula is found. It is shown that the statistics of the largest double precision error as a function of the map parameter is characterized by jumps whose location is determined by certain boundary crossings in the bifurcation diagram. Both jumps and locations seem to present geometric convergence characterized by the two first Feigenbaum constants. Even…

Benford's lawComputationBoundary (topology)Feigenbaum constantsFunction (mathematics)Statistical physicsLogistic mapBifurcation diagramBifurcationMathematicsPhysical review. E, Statistical, nonlinear, and soft matter physics
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Families of piecewise linear maps with constant Lyapunov exponent

2012

We consider families of piecewise linear maps in which the moduli of the two slopes take different values. In some parameter regions, despite the variations in the dynamics, the Lyapunov exponent and the topological entropy remain constant. We provide numerical evidence of this fact and we prove it analytically for some special cases. The mechanism is very different from that of the logistic map and we conjecture that the Lyapunov plateaus reflect arithmetic relations between the slopes.

37E05 37B40FOS: Physical sciencesChaotic Dynamics (nlin.CD)Nonlinear Sciences - Chaotic Dynamics
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