Nonlinear antennas combine advances in nonlinear dynamics, active antenna design, and analog microelectronics to generate beam steering and beam forming across an array of nonlinear oscillators. Nonlinear antennas exploit two phenomena typically shunned in traditional designs: nonlinear unit cells and interelement coupling. The design stems from nonlinear… (More)
Frequency-related oscillations in coupled oscillator systems, in which one or more oscillators oscillate at different frequencies than the other oscillators, have been studied using group theoretical methods by Armbruster and Chossat [Phys. Lett. A 254, 269 (1999)] and more recently by Golubitsky and Stewart [in Geometry, Mechanics, and Dynamics, edited by… (More)
We illustrate a scheme that exploits the theory of symmetry-breaking bifurcations for generating a spatio-temporal pattern in which one of two interconnected arrays, each with N Van der Pol oscillators, oscillates at N times the frequency of the other. A bifurcation analysis demonstrates that this type of frequency generation cannot be realized without the… (More)
—This paper is focused on the exploitation of intrinsic nonlinear dynamics toward novel measurement systems and read-out methodologies. In particular, sensors that can be represented as nonlinear dynamical systems and are often reducible to systems described by a static nonlinearity are considered; the nonlinear behavior therefore reduces to the dynamics of… (More)
—We present a novel implementation of an adaptive generalized sidelobe canceller beamformer, using a coupled nonlinear oscillator array in conjunction with an antenna array. This beamformer is applied in a narrowband wireless communication context, where there is contamination due to transmissions from similar systems. We have applied a least mean square… (More)
Recent results involving hadronic decays of charmed mesons and baryons are reviewed. Information relevant to decay mechanisms and to light quark scalar mesons is discussed.
Objective Meckel-Gruber syndrome (MKS) is a lethal ciliopathy characterised by CNS malformations, cystic kidneys, polydactyly, and liver fibrosis. Most of these can be explained by disruption of cilium-dependent signalling pathways. However, the aetiology of liver fibrosis is less well-understood. We hypothesised that alterations in cell-substrate… (More)
The phenomenon of mixing in neutral meson systems has now been observed in all flavours, but only in the past year in the D 0 system. The standard model anticipated that, for the charm sector, the mixing rate would be small, and also that CP violation, either in mixing or in direct decay, would be below the present levels of observability. It is hoped that… (More)