Results 51 to 60 of about 11,470 (155)
Enhanced Black Hole Mergers in Active Galactic Nucleus Disks due to Precession-induced Resonances
The Astrophysical Journal, 2023 Recent studies have shown that active galactic nucleus (AGN) disks can host sources of gravitational waves. Compact binaries can form and merge in AGN disks through their interactions with the gas and other compact objects in the disk.
Hareesh Gautham Bhaskar +2 more
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A preliminary nonlinear analysis of the earth's chandler wobble
Discrete Dynamics in Nature and Society, 2000 The Chandler wobble (CW) is a resonant response of the Earth rotational pole wandering around its figure axis whose excitation mechanism is still uncertain.
V. Frede, P. Mazzega
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An estimate of the water storage contribution to the excitation of polar motion [PDF]
Geophysical Journal International, 1987 Summary. The major source of the excitation of the Chandler wobble has not yet been established but is believed to be primarily meteorological in origin. Previous studies of the meteorological excitation of the Chandler wobble have measured only effects from motions in the atmosphere and the oceans. The role of global water storage has been regarded as
L. A. Hinnov, C. R. Wilson
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Geodynamic Research at the Department of Planetary Geodesy, SRC PAS
Reports on Geodesy and Geoinformatics, 2016 The Department of Planetary Geodesy of the Space Research Centre PAS has been conducting research on a broad spectrum of problems within a field of global dynamics of the Earth.
Brzeziński Aleksander +11 more
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Comment on Letter “On the excitation of the Earth's polar motion” [PDF]
Geophysical Research Letters, 1987 The use of modern global meteorological data in the investigation of the extent to which atmospheric processes contribute to the observed short‐term and other changes in polar motion (and length of the day) and the determination, by subtraction, of changes in the Earth's rotation of non‐meteorological origin was initiated several years ago.
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Regional Signals in Atmospheric and Oceanic Excitation of Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractAtmospheric and oceanic variability have been shown to play a role in the excitation of polar motion. Regional patterns of atmospheric and oceanic excitation are analysed and compared. The equatorial excitation functions, χ1 an χ2, for the ocean are computed using velocity and mass fields from a near-global ocean model, driven by observed ...
Jolanta Nastula +2 more
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El Niño impact on atmospheric polar motion excitation [PDF]
Journal of Geophysical Research: Solid Earth, 2000 We study the influences of El Niño phenomena on correlations between short‐period variations of atmospheric and geodetic excitation functions of polar motion during 1980–1998. The correlation between these two excitation functions varies with time, with correlation coefficients computed for 1 year spans reaching maxima of 0.7–0.8.
B. Kolaczek +3 more
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ENSO modulates the oceanic excitation of polar motion
Geophysical Research LettersAbstract The El Niño–Southern Oscillation (ENSO) exerts a strong control on interannual length‐of‐day variations, but its imprint on polar motion excitation remains to be identified. We explore the hypothesis that part of this imprint is embedded in oceanic angular momentum (OAM) changes, particularly that component driven by ocean ...
L. Börger +3 more
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Polar motions excited by a convecting viscous mantle
Geophysical Research Letters, 1992 The role played by time‐dependent mantle convection on exciting long‐term polar motions is examined by means of a viscous model. For sufficiently low effective viscosity, polar‐wander speeds of 0(1 deg/Myr) would require contributions from the off‐diagonal elements of the inertia tensor, with magnitudes around 105 times smaller than those found in ...
Jiří Moser +2 more
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Dynamic Analysis and PD Control in a 12-Pole Active Magnetic Bearing System
MathematicsThis paper conducts an in-depth study on the dynamic stability and complex vibration behavior of a 12-pole active magnetic bearing (AMB) system considering gravitational effects under a PD controller. Firstly, based on electromagnetic theory and Newton’s
Yigen Ren, Wensai Ma
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