Results 291 to 300 of about 117,260 (302)
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Instability of an Elastic Strip Hanging in an Airstream
Journal of Applied Mechanics, 1975The stability of a long, thin elastic strip hanging vertically in a downward flowing airstream was considered. Experimentally it was observed that the strip remained essentially motionless or at most developed a small amplitude bounded oscillation as the air speed was increased until a critical speed was attained beyond which violent oscillations of ...
Datta, S. K., Gottenberg, W. G.
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Instability in Hollow and Strip Electron Beams
Journal of Applied Physics, 1956A thin strip or hollow electron beam drifting in a magnetic field directed parallel to the direction of motion is in an unstable condition. As a result of initial nonuniformities the beam breaks up into a series of ``spiral nebulae.'' This paper is written to describe some experimental observations which are of help in understanding the phenomenon, and
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Convection and the ZZ Ceti Instability Strip
1997Theoretical predictions of the ZZ Ceti instability strip (Bradley and Winget 1994; Brassard et al. as cited in Bergeron et al. 1995 (B95)) have found a very strong dependence of the blue edge on the assumed efficiency of the convective energy transport.
D. Koester, G. Vauclair
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Laser pulse modulation instabilities in partially stripped plasma
Chinese Physics, 2005The laser pulse modulation instabilities in partially stripped plasma were discussed based on the phase and group velocities of the laser pulse and the two processes that modulation instabilities excited. The excitation condition and growth rate of the modulation instability were obtained.
Hu Qiang-Lin +2 more
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The Boundaries of the ZZ Ceti Instability Strip
1991Several investigations over the past ten years have shown that the existence of pulsating, DA white dwarfs is restricted to a rather narrow instability strip. And indeed, fast-photometric searches for pulsating stars in that class, coupled to statistical studies of the resulting frequency of variable stars, provide strong evidence that the ZZ Ceti ...
F. Wesemael +3 more
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The ZZ Ceti Instability Strip: Facts and Fallacies
2003Bergeron et al. (1995); (B95 hereafter) have combined optical spectroscopy with ultraviolet observations to produce the most comprehensive analysis of the atmospheric properties of ZZ Ceti stars. In that study, it was shown that model atmospheres calculated with the so-called ML2/α = 0.6 version of the mixing-length theory provides the best internal ...
P. Bergeron, R. Lamontagne
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In search of the Ap instability strip
2008The lack of a definite excitation mechanism for the rapidly oscillating Ap (roAp) stars has hampered both the understanding of these p-mode pulsators and the photometric search for new members of the class. In an effort to identify an empirical ‘instability strip’ for the class, Stromgren colours (b-y, u-b, [m1], [c1], and β) of the roAp stars have ...
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The Instability Strip of ZZ Ceti White Dwarfs
2015The determination of the location of the theoretical ZZ Ceti instability strip in the log g − Teff diagram has remained a challenge over the years, due to the lack of a suitable treatment for convection in these stars. We report here a detailed stability survey over the whole ZZ Ceti regime, including the low and extremely low masses.
Van Grootel, Valérie +3 more
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Instability and Hysteresis in Thermoelastic Tension Strips
2006Y. J. He, Q. P. Sun
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