Gregory S. Duane

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The potential use of chaos synchronization techniques in data assimilation for numerical weather prediction models is explored by coupling a Lorenz three-variable system that represents " truth " to another that represents " the model. " By adding realistic " noise " to observations of the master system, an optimal value of the coupling strength was clearly(More)
The problem of data assimilation can be viewed as one of synchronizing two dynamical systems, one representing " truth " and the other representing " model " , with a unidirectional flow of information between the two. Synchronization of truth and model defines a general view of data assimilation, as machine perception, that is reminiscent of the Jung-Pauli(More)
The dynamical systems paradigm of synchronized chaos may realize the philosophical notion of " synchronicity ". Effectively unpredictable chaotic systems commonly exhibit a predictable relationship when they are coupled through only a few of many variables, a relationship that can be highly intermittent in realistic configurations, as with philosophical "(More)
Teleconnections between the midlatitudes of the Northern and Southern Hemispheres are diagnosed in National Centers for Environmental Prediction–National Center for Atmospheric Research reanalysis data and separately in European Centre for Medium-Range Weather Forecasts reanalysis data. The teleconnections are manifested as a small but significant tendency(More)
To adjust pulse sequences that produce diffusion-weighted MRI signals for increased sensitivity to nucleus size, the impulse-propagator method in q-space is applied to a spherical geometry that would describe each member of a collection of cells and their nuclei, with several possible representations of the extracellular space. The method is extended to(More)
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