Infrared imaging of large-amplitude, low-frequency disturbances on a planar jet

AIAA Journal ◽  
1994 ◽  
Vol 32 (2) ◽  
pp. 317-323 ◽  
Author(s):  
Robert B. Farrington ◽  
Scott D. Claunch
Keyword(s):  
Large Amplitude ◽  
Infrared Imaging ◽  
Low Frequency ◽  
Planar Jet

Comment on 'Infrared imaging of large-amplitude, low-frequency disturbances on a planar jet'

AIAA Journal ◽  
1995 ◽  
Vol 33 (3) ◽  
pp. 568-568 ◽  
Author(s):  
Ehud Gartenberg ◽  
A. Sidney Roberts
Keyword(s):  
Large Amplitude ◽  
Infrared Imaging ◽  
Low Frequency ◽  
Planar Jet

Observations of a planar jet subjected to large-amplitude, low-frequency disturbances

AIAA Journal ◽  
1995 ◽  
Vol 33 (12) ◽  
pp. 2424-2426 ◽  
Author(s):  
Robert B. Farrington ◽  
Scott D. Claunch
Keyword(s):  
Large Amplitude ◽  
Low Frequency ◽  
Planar Jet

scholarly journals Strong Waves from Pulsars and Morphologies in SNRs

1983 ◽  
Vol 101 ◽  
pp. 499-501
Author(s):  
Gregory Benford ◽  
Attilio Ferrari ◽  
Silvano Massaglia
Keyword(s):  
Large Amplitude ◽  
Crab Nebula ◽  
Surrounding Medium ◽  
Low Frequency ◽  
Optical Emission ◽  
Amplitude Wave ◽  
Surface Magnetic Field ◽  
Plasma Absorption ◽  
The Crab Nebula ◽  
Large Amplitude Wave

Canonical models for pulsars predict the emission of low–frequency waves of large amplitudes, produced by the rotation of a neutron star possessing a strong surface magnetic field. Pacini (1968) proposed this as the basic drain which yields to the pulsar slowing–down rate. The main relevance of the large amplitude wave (LAW) is the energetic link it provides between the pulsar and the surrounding medium. This role has been differently emphasized (Rees and Gunn, 1974; Ferrari, 1974), referring to absorption effects by relativistic particle acceleration and thermal heating, either close to the pulsar magnetosphere or in the nebula. It has been analyzed in the special case of the Crab Nebula, where observations are especially rich (Rees, 1971). As the Crab Nebula displays a cavity around the pulsar of dimension ∼1017cm, the function of the wave in sweeping dense gas away from the circumpulsar region is widely accepted. Absorption probably occurs at the inner edges of the nebula; i.e., where the wave pressure and the nebular pressure come into balance. Ferrari (1974) interpreted the wisps of the Crab Nebula as the region where plasma absorption occurs, damping the large amplitude wave and driving “parametric” plasma turbulence, thus trasferring energy to optical radiation powering the nebula. The mechanism has been extended to interpret the specific features of the “wisps” emission (Benford et al., 1978). Possibly the wave fills the nebula completely, permeating the space outside filaments with electromagnetic energy, continuously accelerating electrons for the extended radio and optical emission (Rees, 1971).

Multiple-S-Shaped Critical Manifold and Jump Phenomena in Low Frequency Forced Vibration with Amplitude Modulation

2019 ◽  
Vol 29 (05) ◽  
pp. 1930012 ◽  
Author(s):  
Yue Yu ◽  
Qianqian Wang ◽  
Qinsheng Bi ◽  
C. W. Lim
Keyword(s):  
Amplitude Modulation ◽  
Large Amplitude ◽  
Low Frequency ◽  
Slow Variable ◽  
Critical Manifold ◽  
Singular Orbit ◽  
Modulation Control ◽  
Cycle Oscillation ◽  
Tuning Frequency ◽  
Complex Mechanical Systems

Motivated by the forced harmonic vibration of complex mechanical systems, we analyze the dynamics involving different waves in a double-well potential oscillator coupling amplitude modulation control of low frequency. The combination of amplitude modulation factor significantly enriches the dynamical behaviors on the formation of multiple-S-shaped manifold and multiple jumping phenomena that alternate between epochs of slow and fast motion. We can conduct bifurcation analysis to identify two harmonic vibrations. One is that the singular orbit makes multiple jumps to a fast trajectory segment from one attracting equilibrium to another as the expression of slow variable by using the DeMoivre formula. With the increase of tuning frequency, the system exhibits relaxation-type oscillations whose small amplitude oscillations are produced by nonlinear local cycles together with a distinct large amplitude cycle oscillation accounting for the Melnikov threshold values. The tuning frequency may not only affect the asymptotic expressions for the solution curves near fold singularities but also allow for the large amplitude orbit vibrations near fold-cycle singularities. Numerical analysis for computing critical manifolds and their intersections is used to detect the dynamical features in this paper.

Detection of low-frequency large-amplitude jump in financial time series

2007 ◽  
Author(s):  
Hui Peng ◽  
Genshiro Kitagawa ◽  
Yoshiyasu Tamura ◽  
Yoko Tanokura ◽  
Min Gan ◽  
...  
Keyword(s):  
Time Series ◽  
Large Amplitude ◽  
Financial Time Series ◽  
Low Frequency ◽  
Financial Time
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