This paper describes a semi-global exponentially stable output feedback control law for automatic heading control of ships described by a nonlinear model. Only compass (yaw angle) feedback is used. The yaw rate signal is reconstructed by a linear observer. A wave lter is included in the observer to reduce wear and tear on the rudder servo due to 1st-order wave-induced disturbances. Integral act...

In this study, simulation of Fitzhugh nagumo model in order to generation and propagation of the wave of action potential over the length the of the squid giant axon and survey the passage of time effect in wave propagation have been explored. Simulation has been performed by using the Comsol Multiphysics 3.5 a software. So that, in this simulation, squid giant axon is intended to form hollow c...

We study the braneworld effective action in the two-brane RandallSundrum model. In the framework of this essentially-nonlocal action we reveal the origin of an infinite sequence of gravitational wave modes — the usual massless one as well as the tower of Kaluza-Klein massive ones. Mixing of the modes, which parametrically depends on the background value of the modulus of the extra dimension, ca...

The problem of wave-number selections in nonequilibrium pattern-forming systems in the presence of noise is investigated. The minimum-action method is proposed to study the noise-induced transitions between the different spatiotemporal states by generalizing the traditional theory previously applied in low-dimensional dynamical systems. The scheme is shown as an example in the stabilized Kuramo...

SUMMARY A stable minimum phase transfer function from rudder angle to yaw angle is used to design a globally convergent adaptive ship autopilot. 1st-order wave disturbances in yaw are ltered by applying a notch lter. Integral action is introduced by augmenting the plant. Global convergence is proven for the total system which include the observer, the parameter update law, the feedback controll...

BACKGROUND Although T-wave alternans has been closely associated with vulnerability to ventricular arrhythmias, the cellular processes underlying T-wave alternans and their role, if any, in the mechanism of reentry remain unclear. METHODS AND RESULTS -T-wave alternans on the surface ECG was elicited in 8 Langendorff-perfused guinea pig hearts during fixed-rate pacing while action potentials w...