Results 251 to 260 of about 41,682 (296)

ISME - Incoherent Sampling of Multi-Echo data to minimize cardiac-induced noise in brain maps of R₂* and magnetic susceptibility

Raynaud Q, Oliveira R, Corbin N, Balbastre Y, van Heeswijk RB, Lutti A.   +5 more
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Frequency-direction analysis of geomagnetic pulsations

Studia Geophysica et Geodaetica, 1973
Summary: A new method is presented of computer processing of amplitude-time records. The method is based on a two-component spectral analysis, suitable for investigating a planar stationary oscillatory event. The method is applied to the study of the fine structure of short-period geomagnetic pulsations. Apart from a semi-quantitative representation of
Karel Dobeš, Karel Prikner, Jaroslav Střeštík   +2 more
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Characteristics of high frequency auroral pulsations

Planetary and Space Science, 1967
Abstract The power spectrum of pulsating aurora has been measured in the frequency range 1–20 c/s. It shows consistently an exponential fall off with increasing frequency above about 1–2 c/s. It is shown that this is consistent with an assumption that the modulation mechanism in the flux of primary particles takes place at some distance from the ...
Anders Omholt, Helge Pettersen
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Frequency Analysis on Pulsating Heat Pipe

ASME 2007 InterPACK Conference, Volume 1, 2007
The pulsating heat pipe should have one eigen frequency based on the temperature visualization of pulsating heat pipe. The preliminary model of pulsating heat pipe is established by the force balance between the driving force, the inertial force and the frictional force.
Wei Qu, Yuhua Li, Tongze Ma
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Attenuation of low frequency pressure pulsations

2022
In this thesis, the concept of hydraulic pulsating filter is explored and developed. The filter or resonator is designed to attenuate the pulsation that occurs when the hydraulic pump is discharged. Pumps pulsate over a range of frequencies, depending on pump design, speed, displacement, and other factors.
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Low-Frequency Pulsations of Coronal Magnetic Loops

Radiophysics and Quantum Electronics, 2001
We analyze low-frequency intensity fluctuations of the microwave emission from solar flares at frequencies 22 and 37 GHz. The three microwave bursts of durations of about 1 h, observed at the Metsahovi Radio Observatory (Finland) with the time resolution of 0.1 and 0.05 s, are studied.
V. V. Zaitsev, A. G. Kislyakov, A. V. Stepanov, S. Urpo, E. I. Shkelev   +4 more
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Long-period very low frequency emission pulsations

Journal of Geophysical Research, 1965
Pulse trains with periods of the order of a minute occur in the natural VLF signals emitted in the exosphere. Composed of otherwise ordinary VLF emissions, the long-period pulses always rise in frequency. At magnetically conjugate points the long-period pulse signals are received simultaneously.
W. B. Carson, J. A. Koch, J. H. Pope, R. M. Gallet   +3 more
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Resonance Frequency of Bubble Pulsations (Approximate Solution)

Journal of Engineering Physics and Thermophysics, 2015
The problem of bubble pulsations in a volume of a quiescent liquid with periodic external pressure fluctuations has been considered in a linear approximation. The incorrectness of the use of a polytropic approximation is shown. An approximate analytical solution for the resonance frequency of pulsations has been obtained.
Yu. B. Zudin, N. Sh. Isakov, V. V. Zenin
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Nonlinear theory of low frequency geomagnetic pulsations

Planetary and Space Science, 1979
Abstract The nonlinear equations for Alfven waves in magnetospheric plasma are studied taking the influence of hot particles into account. It is shown that oscillations are localized in regions where the pressure of hot ions has local minima.
Ya.N. Istomin, O.A. Pokhotelov
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Articulated Pipes Conveying Fluid Pulsating with High Frequency

Nonlinear Dynamics, 1999
The author investigates stability and nonlinear dynamics of two articulated pipes conveying fluid with a high-frequency pulsating component. The non-autonomous model equations are converted into autonomous ones by approximating fast excitation terms with slowly varying terms. The downward hanging pipe position will lose stability if the mean flow speed
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