Subpeaks in the Brillouin loss spectra of distributed fiber-optic sensors were observed for what is believed to be the first time and studied. We discovered that the Fourier spectrum of the pulsed signal and the off-resonance oscillation both contributed to subpeaks. The off-resonance oscillation at frequency /v - vB/ is the oscillation in the Brillouin time domain when beat frequency v of the ...

Laros et al. state probably on the basis of experience in one patient that oral high frequency oscillation (OHFO) combined with forced expiration manoeuvres on tracheobronchial clearance is disappointing in patients with flaccid lungs. Their letter to the editor suggests that our conclusions, meaning that OHFO combined with forced expiration manoeuvres is inefficient, could not be made because ...

for patients with severe respiratory failure. Although the technology has advanced in recent times, the noise levels produced by such devices remain high. Exposure to excessive noise in intensive care may cause hearing problems for both staff and patients following long-term exposure. We investigated the noise level in decibels produced by a SensorMedics 3100B ventilator (SensorMedics, Bilthove...

AIM To examine the delivered volume during "high volume strategy" high frequency oscillation, used as rescue treatment in preterm infants; and to identify factors, other than frequency and oscillatory amplitude, influencing the magnitude of volume delivery. METHOD Twenty infants (median gestational age 29 weeks) were studied on 45 occasions. Two oscillator types were used (SensorMedics and SL...

In this paper a model to accurately evaluate even in a pencil-and-paper manner the oscillation frequency of a ring oscillator made up by a CML or ESCL differential gate is proposed. The model allows us to simply estimate the oscillation frequency changes due both to the bias current change and to process tolerances. The model was validated by Spice simulations on both 6and 20-GHz technologies f...

This paper presents a method for creating and distributing small, precision currents throughout an integrated circuit. The system is designed for use in a bionic cochlear implant. A bandgap reference and an off-chip precision resistor create a single precision reference current. This current is then converted into an oscillation frequency. This oscillation frequency is distributed losslessly ar...

In the present issue of Critical Care, van Heerde and colleagues describe a new technical development (a flow-demand system during high-frequency oscillation) that may have an important impact on the future use of high-frequency ventilation in children and adults. Flow compensation on patient demand seems to reduce the imposed work of breathing, may therefore increase patient comfort, and shoul...

This study discusses time syntonization and frequency stability calibration using GPS carrier phase measurements. Thus far most papers on this subject discussed using two GPS receiver measurements, and performing frequency stabilizing and vehicle positioning with the double differences. This paper proposes using a dual frequency GPS receiver and a novel extension controller neural network algor...

The analysis shows that there is no intrinsic oscillation in the relation between frequency and length of words. The rise of oscillation is caused by using moving averages for smoothing the extremely dispersed data.