We interpret the correlation over five orders of magnitude between high frequency νhigh and low frequency νlow in a quasi-periodic oscillation (QPO) found by Psaltis, Belloni & van der Klis (1999, 2002) for black hole candidate (BHC) and neutron star (NS) systems and then extended by Mauche (2002), Warner et al (2003) and Warner & Woudt (2004) to white dwarf (WD) binaries. As declaimed, νhigh a...

Stochastic processes that exhibit cross-frequency coupling (CFC) are introduced. The ability of these processes to model observed CFC in neural recordings is investigated by comparison with published spectra. One of the proposed models, based on multiplying a pulsatile function of a low-frequency oscillation (θ) with an unobserved and high-frequency component, yields a process with a spectrum t...

In this study, a set of experimental results for wave forces acting on a cylinder oscillating with dual frequency in still water are reported. The experiment was designed to mimic a cylinder slowly oscillating in regular waves, with the high-frequency oscillation representing the wave motion and the low-frequency oscillation, the slow drift motion. The inline forces acting on the cylinder were ...

Past models of current-mode control have sufferered from either insufficient accuracy to properly predict the effects of current-mode control, or from analytical complexity that renders them inaccessible to the power supply designer. This paper combines the accuracy of sampled-data modeling with the simplicity of conventional pole-zero representation. As a result, it offers a current-mode contr...

This paper describes the design of noise-critical circuits for radio-frequency and high-speed digital applications in a SiGe:C BiCMOS technology. Starting with a figure of merit for the high-frequency noise behavior of bipolar transistors, challenges in the transistor design are formulated. It is shown that the addition of carbon to the base of a SiGe-HBT results in an excellent high-frequency ...

In a crossover trial left ventricular output (LVO), cerebral blood flow velocity (CBFV), and resistance index (RI) of the anterior cerebral artery were compared using Doppler ultrasonography, in eight preterm infants with respiratory distress syndrome (RDS) during conventional mechanical ventilation and high frequency oscillation. LVO was 14% to 18% lower with high frequency oscillation. There ...

Recent observations of the low–mass X–ray binary 4U 1636–53 with the Rossi X– ray Timing Explorer show, for the first time, a kiloHertz quasi–periodic oscillation (kHz QPO) peak separation that exceeds the neutron star spin frequency as inferred from burst oscillations. This strongly challenges the sonic–point beat frequency model for the kHz QPOs found in low–mass X–ray binaries. We detect two...

The possibility of a resonant excitation of a free oscillation mode with an observed period of 4.2311 d in the star 51 Pegasi by the tidal action of a low-mass companion is investigated. A free oscillation mode with the observed period is shown to correspond to a g+-mode of a high radial order. For the determination of the tidal displacement in a component of a close binary system of stars near...