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Resonantly Induced Friction and Frequency Combs in Driven Nanomechanical Systems.
Phys Rev Lett
June 2019
Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany.
We propose a new mechanism of friction in resonantly driven vibrational systems. The form of the friction force follows from the time- and spatial-symmetry arguments. We consider a microscopic mechanism of this resonant force in nanomechanical systems.
View Article and Find Full Text PDFNetwork mechanisms underlying the role of oscillations in cognitive tasks.
PLoS Comput Biol
September 2018
Centre de Recerca Matemàtica, Campus de Bellaterra Edifici C, 08193 Bellaterra, Barcelona, Spain.
Oscillatory activity robustly correlates with task demands during many cognitive tasks. However, not only are the network mechanisms underlying the generation of these rhythms poorly understood, but it is also still unknown to what extent they may play a functional role, as opposed to being a mere epiphenomenon. Here we study the mechanisms underlying the influence of oscillatory drive on network dynamics related to cognitive processing in simple working memory (WM), and memory recall tasks.
View Article and Find Full Text PDFDriven nonlinear nanomechanical resonators as digital signal detectors.
Sci Rep
July 2018
Michigan State University, East Lansing, MI, 48824, USA.
Because of their nonlinearity, vibrational modes of resonantly driven nanomechanical systems have coexisting stable states of forced vibrations in a certain range of the amplitude of the driving force. Depending on its phase, which encodes binary information, a signal at the same frequency increases or decreases the force amplitude. The resulting force amplitude can be outside the range of bistability.
View Article and Find Full Text PDFAn extensive numerical study of diffraction of a plane monochromatic wave by a single gold cone on a plane gold substrate and by a periodical array of such cones shows formation of curls in the map of the Poynting vector. They result from the interference between the incident wave, the wave reflected by the substrate, and the field scattered by the cone(s). In case of a single cone, when going away from its base along the surface, the main contribution in the scattered field is given by the plasmon surface wave (PSW) excited on the surface.
View Article and Find Full Text PDFAsymptotic dynamics of reflecting spiral waves.
Phys Rev E Stat Nonlin Soft Matter Phys
December 2014
Mathematics Institute, University of Warwick, Coventry CV4 7AL, United Kingdom.
Resonantly forced spiral waves in excitable media drift in straight-line paths, their rotation centers behaving as pointlike objects moving along trajectories with a constant velocity. Interaction with medium boundaries alters this velocity and may often result in a reflection of the drift trajectory. Such reflections have diverse characteristics and are known to be highly nonspecular in general.
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