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The quantitative result of annual polar motion excitation by the ocean is presented for the first time. The atmospheric excitation amounts to more than double of the oceanic excitation. The sum of atmospheric and oceanic excitations approximates more to the observed annual polar motion excitation, compared with atmospheric excitation only. This suggests that the atmosphere and ocean are the main excitation sources of annual polar motion. 相似文献
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LIAODechun LIAOXinhao ZHOUYonghong 《科学通报(英文版)》2004,49(22):2348-2353
The Chandler wobble excitation function (hereinafter, geodetic excitation) is obtained by removing the seasonal components and low frequency components with periods from several years to decades from the polar motion excitation function derived from SPACE2002 series. The geophysical excitation functions of the individual AAM, OAM, HAM, and two combined excitations of the AAM OAM and AAM OAM HAM at ld, 5d, lm and 3m intervals are statistically tested for the hypothesis of the normality, and then tested for the hypotheses of identical distribution between the geodetic and the geophysical excitations. The results show that, among the total 16 components of the two combined excitation functions at ld, 5d, lm and 3m intervals, most follow random normal processes, the hypotheses of identical distribution between the geodetic excitation and the two combined excitation are acceptable, while most of the hypotheses of identical distribution between the geodetic excitation and the individual excitations of the AAM, OAM, and HAM are rejectable. These results elucidate from a new point of view, that the excitations from AAM, OAM, and HAM are the main sources of the Chandler wobble, and the Chandler wobble excitation function is of a random normal property. 相似文献
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Real-time rapid prediction of variations of the Earth's rotational rate is of great scientific and practical importance. However, due to the complicated time-variable characteristics of variations of the Earth's rotational rate (i.e., length of day, LOD), it is usually difficult to obtain satisfactory predictions by con- ventional linear time series analysis methods. This study employs the nonlinear artificial neural net-works (ANN) to predict the LOD variations. The topology of the ANN model is determined by minimizing the root mean square errors (RMSE) of the predictions. Considering the close relationships between the LOD variations and the atmospheric circulation movement, the operational prediction series of axial atmospheric angular momentum (AAM) is incorporated into the ANN model as an additional input in the real-time rapid prediction of LOD variations with 1-5 days ahead. The results show that the LOD prediction is significantly improved after introducing the operational prediction series of AAM into the ANN model. 相似文献
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转动类体育动作几个知识点的分析 总被引:2,自引:0,他引:2
转动普遍存在于体育动作中.在一些体育文献中,对转动的分析不很清楚,有时存在概念上的模糊或逻辑上的混乱.本文从运动学和动力学的角度予以澄清 相似文献
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杨一军 《淮北煤炭师范学院学报(自然科学版)》1992,(4)
有的文献在讨论费曼园盘佯谬时,得到园盘所获机械角动量是由电磁角动量转化而来的结论欠妥.本文通过定量计算,给出正确答案,并指出在讨论电磁体系角动量时,经常疏忽的一个问题. 相似文献
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杨一军 《淮北煤炭师范学院学报(自然科学版)》1993,(2)
本文借助矢量分析工具,针对费曼园盘佯谬中,园盘边缘的带电小球改放在线圈内部的情形,解决了发散困难,在定量计算的基础上,对电磁体系角动量守恒做全面讨论,给出完整的物理图像. 相似文献
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采用引入变量的多元复合函数微商法则,将直角坐标系下的1阶偏微分形式变换成球极坐标形式,进而推导出球极坐标系下角动量平方算符与拉普拉斯算符的表达式.这将使得在量子力学中求解Schr?dinger方程、各角动量算符对应的各角量子数变得更加简单. 相似文献
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三个自旋为1/2的粒子的自旋波函数 总被引:1,自引:0,他引:1
梁景辉 《山西师范大学学报:自然科学版》1994,8(4):15-18
本文介绍了如何构造三个自旋为1/2的粒子的自旋波函数的方法,对于构造多粒子体系的自旋波函数具有重要的作用。 相似文献
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赵丽云 《安庆师范学院学报(自然科学版)》2010,16(3):110-111
对于光滑水平面上小球与均质自由杆的碰撞系统,选取碰撞时细杆的质心以及细杆和小球的质心作为两个不同的参考点,分别写出应用角动量守恒定律得到的结果,证明两个结果是等价的,因而系统对任意参考点的角动量都守恒。 相似文献
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地球自转对大气海洋运动的响应 总被引:1,自引:0,他引:1
分析了地球自转的年际变化和异常变化,说明它们与热带太平洋的大气、海洋大尺度范围的年际变化——厄尔尼诺(ElNio)事件相当一致,而地球自转的异常变慢稍迟后于厄尔尼诺事件.可能由于伴随着厄尔尼诺事件大气角动量异常增加,引起了地球自转的变慢.可用天文测时资料的归算,监视日长年际变化的极小值,来预测厄尔尼诺事件的发生. 相似文献