Results 301 to 310 of about 139,680 (346)

Active suppression of acoustic resonance

The Journal of the Acoustical Society of America, 1987
The minimization of acoustic potential energy has been proposed as a method of actively controlling a harmonic reverberant sound field. In this paper an analysis of plane waves in a finite length duct provides insight into the physical mechanisms of this method and allows comparison with two other methods, the acoustical virtual earth and the absorbing
Curtis, A. R.D., Nelson, P. A., Elliott, S. J., Bullmore, A. J.   +3 more
openaire   +2 more sources

Adaptive stabilization and resonance suppression

International Journal of Control, 1990
Control systems can drift into instability or, less catastrophically, exhibit resonance behaviour. One role for adaptive controllers is to learn sufficient information concerning the dominant closed-loop system mode so as to apply effective feedback to dampen these modes. In such situations the adaptive loop augments the fixed controller feedback loop.
ANDREW J. TELFORD, JOHN B. MOORE
openaire   +1 more source

Suppression of Rayleigh Backscattering in Resonators

2018 IEEE Photonics Conference (IPC), 2018
We demonstrate dynamic suppression of Rayleigh backscattering in a whispering gallery mode resonator by locally breaking time-reversal symmetry through a Brillouin optomechanical interaction.
Seunghwi Kim, Jacob M. Taylor, Gaurav Bahl   +2 more
openaire   +1 more source

Fibers with resonant mode suppression

SPIE Proceedings, 2007
Noise can limit the power in a fiber amplifier by competing with the signal for gain. Disributed filtering offers a way of overcoming current high-power limitations by selectively removing noise before it is amplified. Resonant mode suppression is a flexible strategy for wavelength filtering as well as suppression of unwanted transverse modes. An Yb-
J. M. Fini, M. D. Mermelstein, M. F. Yan, R. T. Bise, A. D. Yablon, P. W. Wisk, M. J. Andrejco   +6 more
openaire   +1 more source

Contrast resonance imaging with microbubble resonance enhancement and suppression

2008 IEEE Ultrasonics Symposium, 2008
A new set of multiple-pulse contrast modalities with combinations of power modulation (PM), pulse inversion (PI) and contrast resonance (CR) are proposed in order for contrast imaging sensitivity improvement. For the CR mode, an imaging pulse is ldquoembeddedrdquo in a long ldquoresonancerdquo pulse so that the dynamic ldquoresonantrdquo state of a ...
William T. Shi, Christopher S. Hall, Patrick G. Rafter   +2 more
openaire   +1 more source

Suppression of higher harmonics at noise induced resonances

Physical Review E, 1995
We consider the generation of higher harmonics in periodically driven noisy nonlinear systems. Recent numerical studies of higher harmonics in such systems have shown so-called noise induced resonances that manifest themselves in a strong suppression of higher harmonics at certain values of the noise level.
Jung, Peter, Talkner, Peter
openaire   +3 more sources

Suppression of chaos in weakly coupled diode resonators

Physical Review E, 1993
We have demonstrated through the system of two coupled driven diode resonators that chaos of the diode resonators can be reduced by weak coupling. Stable periodic orbits emerge from the chaotic attractor when a small coupling signal perturbs the diode resonator.
, Shin, , Kwun, , Kim
openaire   +2 more sources

Single mode ring resonator with harmonic suppression

2014 14th International Symposium on Communications and Information Technologies (ISCIT), 2014
A single-side-access ring resonator for bandpass filter is presented. The characteristics of the resonator were investigated in terms of width and gap of the ring line and coupled-lines on microstrip. It is found that the frequency response and bandwidth of the resonator can be controlled by controlling the width and gap of the ring elements.
N. A. Wahab, M. K. M. Salleh, Z. I. Khan, Nur Emileen Abd Rashid, Kama Azura Othman   +4 more
openaire   +1 more source

Suppression of false resonances in the resonating-group method

Il Nuovo Cimento A, 1973
It is shown in a numerical example that false resonances arise in the resonating-group method when an open channel is neglected. They can be suppressed by a least-squares defect minimization method which has been developed recently.
openaire   +1 more source

Resonant suppression of Turing patterns by periodic illumination

Physical Review E, 2001
We study the resonant behavior of Turing pattern suppression in a model of the chlorine dioxide-iodine-malonic acid reaction with periodic illumination. The results of simulations based on integration of partial differential equations display resonance at the frequency of autonomous oscillations in the corresponding well stirred system.
M, Dolnik, A M, Zhabotinsky, I R, Epstein   +2 more
openaire   +2 more sources