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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
The heat flow analysis in the potentially convective layer gives values higher than those obtained previously by tidal dissipation models, and suggests that the ice may be limited to a thin layer of ~4 km total thickness.
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The time needed for the synchronization is shown to be less than the age of the solar system, provided that Pluto's tidal dissipation function is smaller than 104-105.
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At the same time difficulty has been experienced in explaining the large value of the astronomically detected tidal dissipation.
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Tidal dissipation at the ocean floor has long been regarded as an adquated explanation to the behaviour of lunar orbit and Earth's rotation, although the actual mechanism involved is yet a fascinating research subject to date.
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Tidal dissipation around Japan has been investigated for M2 and K1 constituents by using NAO.99Jb model.
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| | Using 11 years (1983~1994) observation data of Satellite Laser Ranging (SLR) to the Lageos 1 satellite in the global tracking network,we estimate the second degree gravity field coefficient and tidal parameters. The tidal solutions obtained from SLR and satellite altimetry are used to compute the secular changes in the Moon's orbit elements and the Earth rotation rate in the ecliptic reference system. The SLR derived secular change in the Moon's mean motion caused by the total tidal dis... | | 利用 198 3~ 1994年 (共 11年 )期间 ,全球人卫激光测距 (SLR)观测网对 L ageos-1卫星的观测资料 ,估算二阶重力场系数和潮汐参数。SLR和卫星测高的潮汐解被用来计算月球轨道根数相对黄道坐标系的长期变化和地球自转速率的长期变化。SLR确定的总的潮汐耗散引起的月球平均运动的长期变化为 -2 4.78″/世纪 2 ,与激光测月结果 ((-2 4.9± 1.0 )″/世纪 2 )非常一致。日月潮汐引起的地球自转速率的长期变化为 -5 .2 5× 10 -2 2 rad/ s2 ,顾及地球扁率变化 (J2 )的非潮汐效应 ,对应的日长变化为 1.49ms/世纪 ,与 16 2 0年以来的天文月掩星结果 (1.4ms/世纪 )十分相符。本文还联合卫星测高和人卫激光测距确定的潮汐解 ,在月球平均运动和地球自转速率的长期变化中 ,分离出固体地球和海洋的耗散效应 | | 文摘来源 | | Jupiter's four large moons, Ic, Europa, Ganymede, and Callisto, are orbiting synchronously, and are all known as Galilean satellites after Galileo Galilei, who discovered them in 1610. NASA's Galileo spacecraft, which reached the Jupiter system in 1995, has deepened our understanding of Galilean satellites in the past few years. In this paper, we use the new geodetic data (see Table l) to construct a series of models for the internal structure of Galilean satellites, and to calculate their parameters of equ... | | 木星的四颗大卫星都是同步轨旋卫星,常被称为伽利略卫星.美国发射的伽利略飞船自1995年12月抵达木星系统后,近几年来对木星的四颗伽利略卫星进行了一系列的探测.利用飞船探测的最新资料作为约束条件,建立了伽利略卫星的一组内部结构模型;然后按照同步轨旋卫星的形状理论公式计算了它们的平衡形状参数及潮汐耗散因子等. | | 文摘来源 | | A nonlinear dynamics evolution theory for the Earth Moon system has been derived under the assumption that the moment of tidal friction is in proportion to the product of tide producing force and the speed of the tide peaks relative to the Earths surface. Where, the influence of tidal dissipation on the evolution of Earth Moon system is only attributed to one Earth evolution parameter, which can be determined by the secular observed data of Earths current angular acceleration. In term... | | 针对当前理论在地月系统演化问题上所面对的困难 ,作者在潮汐摩擦力矩正比于起潮力和潮峰相对于地面的速率的乘积的假定下 ,建立了地月系统的一种非线性动力学演化理论 .其中潮汐耗损对地月系统演化的影响被归结为惟一的地球演化参数 ,并可由地球自转角加速度的长期观测值加以确定 ,由此便可得到地月距离、日长、回归年天数和朔望月天数等的长期演化规律 .理论显示一般的行星 卫星系统总共存在 4种迥然不同的演化方式 ,而地月系统遵循其中的“平静 暴胀 稳定演化”的模式演化 :约在 3 1× 1 0 9a以前 ,月亮几乎始终处在离地心 1 5 483× 1 0 7m的Roche极限内 ,地月之间的强大起潮力使得地壳演化长期处于构造活动期 ,也使月海火山和玄武岩频仍喷发 ;约在 3 1× 1 0 9a至 3 0× 1 0 9a前 ,地月距离突然暴胀了 1 0多倍 ,导致太古代地壳构造活动和月海玄武岩喷发迅速终止 ;然后地月系统处于稳定演化期 ,直至今日和未来 .由月海玄武岩喷发终止年代确定的目前地球自转角加速度为 ·ω0 =(-4 63 5 ± 0 0 76)× 1 0 - 2 2 rad/s2 ,与长期天文观测值完全一... | | 文摘来源 | |   | | << 更多相关文摘 |
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