Results 21 to 30 of about 2,917 (259)
Nutation and Reference Frame [PDF]
Highlights of Astronomy, 1995 The reference frames are of fundamental importance in all kinds of the precession and nutation studies involving the theory, the coordinate transformation and the observations. The aim of this paper is to review all the frames used in such studies and to lead to a better consistency between them in order that theory and reductions of observations be ...
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The Earth's Constitution and the Nutations [PDF]
Symposium - International Astronomical Union, 1980 The theoretical researches on this subject were first developed in a consistent theory, in 1765, by Euler, who studied the theory of the motion of a rotating rigid body. Bradley shortly before, in 1737, had discovered the first forced nutation, with a period of 18.6 years, which was explained by d'Alembert.
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Shapiro like steps reveals molecular nanomagnets’ spin dynamics
AIP Advances, 2015 We present an accurate way to detect spin dynamics of a nutating molecular nanomagnet by inserting it in a tunnel Josephson junction and studying the current voltage (I-V) characteristic.
Babak Abdollahipour +2 more
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MathematicsIn view of the problems of the complex design, difficult machining, and high manufacturing cost of a traditional nutation reducer, this paper intends to design a nutation reducer and study its meshing performance.
Haoyu Chen, Qinghai Li, Chao Jia
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EVALUATION OF OUTER CORE VISCOSITY INFLUENCE ON THE EARTH FORCED NUTATION
Odessa Astronomical Publications, 2007 On the base of the combined method, consisting of the Sasao, Okubo, Saito (1980) approach with the iteration procedure, allowing couple finite element method with the solution of the Laplace equation, it have evaluated the influence of outer core ...
M. V. Lubkov
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Optimal Design of Single-stage Double-arc Spiral Bevel Gear Nutation Reducer
Jixie chuandong, 2020 According to the nutation motion principle，a new single-stage double circular-arc spiral bevel gear nutation reducer with simple structure and large transmission ratio is designed， and its transmission ratio calculation formula is obtained.
Zheng Lin +3 more
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IEEE Access, 2019 Considering the wear in mechanical bearings and the requirement for sensors or electrical power in active magnetic bearings, a novel nutation blood pump using a passive magnetic spherical bearing was developed in this paper.
Gang Chen +4 more
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The effect of the differential rotation of the earth inner core on the free core nutation
Geodesy and Geodynamics, 2019 Seismic observations shows that the inner core rotates faster than the mantle and the rotation axis of the inner core may not align with the rotation axis of the mantle. Free core nutation reflects core's information.
Mian Zhang, Chengli Huang
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Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
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Evaluation of the first three years of Vgos 24 h sessions using a Kalman filter with C5++
Earth, Planets and Space, 2023 We analyzed the first three years of VGOS 24 h sessions, and evaluated the performance in terms of Earth orientation parameters (EOP) and station positions.
Periklis-Konstantinos Diamantidis +1 more
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