Numerical and experimental evidences are presented to show that many phase synchronized systems of nonidentical chaotic oscillators, where the chaotic state is reached through a period-doubling cascade, show rapid convergence of the time-averaged frequency. The speed of convergence toward the natural frequency scales as the inverse of the measurement period. The results also suggest an explanat...

Workstations in a local area network environment must provide a time service that is synchronized with the other clocks on the LAN. To stay synchronized, computers on a network exchange information about the time via a time service protocol and adjust their own clock accordingly. These adjustments make the system clocks unstable (or tick unevenly). Unstable clocks introduce errors in the measur...

Abstract In this paper we compared the fast Intensified Charge Coupled Device (ICCD) imaging with newly developed diagnostic method that utilizes laser induced breakdown in plasma jet. Our helium jet was powered by an 80 kHz high-voltage sine wave and propagated into ambient air. Pulsed beam 1064 nm (4 ns pulse duration 5 Hz repetition rate) focused lens at energy below threshold helium. Laser ...

This paper presents a Park transform-based method for preprocessing stator current data from a motor and transforming it into a form that is useful for fault detection and diagnostics. The proposed method generates power signatures that are invariant to the initial electrical angle of the voltage when the motor is connected to the utility, and can also adapt to variations in the electrical angl...

We studied the response of high-Tc biepitaxial grain boundary junctions to 100 GHz radiation in the presence of a magnetic field. Integer as well as subharmonic constant voltage steps are observed, even at one-fifth of the voltage separation between integer ~Shapiro! steps. Our results indicate that this behavior is due to the synchronized motion of Josephson vortices along the junction. We sho...

Sleep is involved in memory consolidation. Current theories propose that sleep-dependent memory consolidation requires active communication between the hippocampus and neocortex. Indeed, it is known that neuronal activities in the hippocampus and various neocortical areas are correlated during slow-wave sleep. However, transitioning from wakefulness to slow-wave sleep is a gradual process. How ...

We propose a piezoelectric transducer-(PZT-) based optoelectronic frequency synchronizer to control simultaneously change in the repetition rate, the relative pulse delay, and the phase noise of a passively mode-locked femtosecond Ti:sapphire laser with an intracavity saturable Bragg reflector absorber with respect to an electronic frequency reference. An optoelectronic phase-locked-loop-based ...