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高精度天文测量与天文动力学 被引量:1
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作者 倪维斗 《紫金山天文台台刊》 北大核心 2003年第1期91-95,共5页
本文简述精密天文测量和天文动力学的关系、发展和展望。
关键词 高精度天文测量 天文动力学
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Mass Density Distributions in Spiral Galaxies
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作者 Robert Leonard Bish 《World Journal of Mechanics》 2014年第5期137-152,共16页
The purpose of this paper is to show, on the basis of Newtonian mechanics (in Euclidean space), that the core disks of spiral galaxies (the central disks in galactic cores that are perpendicular to the axes of rotatio... The purpose of this paper is to show, on the basis of Newtonian mechanics (in Euclidean space), that the core disks of spiral galaxies (the central disks in galactic cores that are perpendicular to the axes of rotation) rotate in the same fashion as a phonograph turntable, if the mass densities in the cores of such galaxies remain uniform. On the basis of the hypothesis of uniform mass density in the core, it is then shown that the density of mass in the shell (the entire domain outside of the core) must remain inversely proportional to the square of radial distance from the axis of rotation and that the angular velocity in the shell annulus (annulus in the shell that contains the spiral forms) is inversely proportional to radial distance, or that the circumferential velocity on the shell disk is independent of radial distance from the core axis. The equation of motion for the shell disk is then obtained and it is concluded that the spiral shaped lanes are not trajectories. But it is shown that any bar-shaped feature crossing the shell annulus and core disk, collinear with the core centre, will become distorted, due to the above angular velocity distribution in the shell disk, assuming the form of two, symmetrically disposed, Archimedean spirals, while the portion of the bar inside the core remains undistorted and merely rotates. 展开更多
关键词 astrodynamics GALACTIC ASTRONOMY astrometry Field Theory NEWTONIAN MECHANICS Celestial MECHANICS
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Proposal of New Criteria for Celestial Mechanics
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作者 Gabriel Barceló 《International Journal of Astronomy and Astrophysics》 2013年第4期385-391,共7页
Based on a new interpretation on the behavior of rigid bodies exposed to simultaneous non-coaxial rotations, we have developed a hypothesis: the Theory of Dynamics Interactions, which can be applied to understand cele... Based on a new interpretation on the behavior of rigid bodies exposed to simultaneous non-coaxial rotations, we have developed a hypothesis: the Theory of Dynamics Interactions, which can be applied to understand celestial mechanics. We have analyzed the velocity and acceleration fields generated in a rigid body with intrinsic angular momentum, when exposed to successive torques, to assess new criteria for this speeds coupling. In this context, reactions and inertial fields take place, which cannot be justified by means of classical mechanics. We believe that the results obtained after the analysis of dynamics fields systems accelerated by rotation will allow us to conceive a new perspective in celestial dynamics, astrometry, stellar dynamics and galactic astronomy, unknown up to date. After carrying out ample research, we have come to the conclusion that there still exists an unstructured scientific area under the present general assumptions and, more specifically, in the area of dynamic systems submitted to rotational accelerations. The aim of this paper is to present information of the surprising results obtained, and to attract the interest towards the investigation of this new area of knowledge in rotational non-inertial dynamics, and its multiple and remarkable scientific applications. 展开更多
关键词 Celestial MECHANICS astrodynamics Stellar DYNAMICS GALACTIC Astronomy astrometry DYNAMICS Fields Dynamical Systems Theory Orbital MECHANICS Intrinsic Angular Momentum SPEEDS Coupling
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