0000000000144138

AUTHOR

C. A. Marlow

showing 3 related works from this author

Temporal Structure of Human Gaze Dynamics Is Invariant During Free Viewing.

2015

We investigate the dynamic structure of human gaze and present an experimental study of the frequency components of the change in gaze position over time during free viewing of computer-generated fractal images. We show that changes in gaze position are scale-invariant in time with statistical properties that are characteristic of a random walk process. We quantify and track changes in the temporal structure using a well-defined scaling parameter called the Hurst exponent, H. We find H is robust regardless of the spatial complexity generated by the fractal images. In addition, we find the Hurst exponent is invariant across all participants, including those with distinct changes to higher or…

AdultVisual acuityAdolescentEye MovementsComputer scienceInformationSystems_INFORMATIONINTERFACESANDPRESENTATION(e.g.HCI)ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONVisual Acuitylcsh:MedicineNeural degenerationTemporal lobeOcular Motility DisordersYoung AdultFractalInformationSystems_MODELSANDPRINCIPLESOcular Motility DisordersMuscle Stretching ExercisesmedicineHumansComputer visionInvariant (mathematics)lcsh:ScienceHurst exponentMultidisciplinarybusiness.industrylcsh:REye movementComputational BiologyRandom walkGazeTemporal LobeFractalsHuman visual system modelNerve Degenerationlcsh:QArtificial intelligencemedicine.symptombusinessResearch ArticlePLoS ONE
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Unified model of fractal conductance fluctuations for diffusive and ballistic semiconductor devices

2006

We present an experimental comparison of magnetoconductance fluctuations measured in the ballistic, quasiballistic, and diffusive scattering regimes of semiconductor devices. In contradiction to expectations, we show that the spectral content of the magnetoconductance fluctuations exhibits an identical fractal behavior for these scattering regimes and that this behavior is remarkably insensitive to device boundary properties. We propose a unified model of fractal conductance fluctuations in the ballistic, quasiballistic, and diffusive transport regimes, in which the generic fractal behavior is generated by a subtle interplay between boundary and material-induced chaotic scattering events.

PhysicsCondensed matter physicsScatteringConductanceBoundary (topology)Semiconductor deviceUnified ModelCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsElectronic Optical and Magnetic Materials[SPI]Engineering Sciences [physics]FractalQuantum dotChaotic scatteringStatistical physicsPhysical Review B
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Experimental investigation of the breakdown of the Onsager-Casimir relations

2006

We use magnetoconductance fluctuation measurements of phase-coherent semiconductor billiards to quantify the contributions to the nonlinear electric conductance that are asymmetric under reversal of magnetic field. We experimentally determine that the average asymmetric contribution is linear in magnetic field (for magnetic flux much larger than one flux quantum) and that its magnitude depends on billiard geometry. In addition, we find an unexpected asymmetry in the power spectrum characteristics of the magnetoconductance with respect to reversal of magnetic field and bias voltage.

PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsmedia_common.quotation_subjectGeneral Physics and AstronomySpectral densityFOS: Physical sciencesBiasingCondensed Matter::Mesoscopic Systems and Quantum Hall EffectAsymmetryMagnetic fluxMagnetic fieldCasimir effectMagnetic flux quantumMesoscale and Nanoscale Physics (cond-mat.mes-hall)Dynamical billiardsmedia_common
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