章动

The relationship between the subtropical anticyclone and subtropical easterlies is discussed, aiming at the problem of high temperature and drought in the globe.

仅就2006年发生在四川、重庆的高温干旱问题，讨论了副热带高压与东风层的关系，进而对地球的章动、转速的变化做了对比分析。

In this paper, based on the effect of both of them in latitude and time observation, the data of observation of a Danjon astrolabe at the Shanghai Observatory from 1960 to 1978 were analysed with the method of maximum entropy spectral analysis.

本文根据二者对纬度和时间观测结果的影响，用最大熵功率谱方法方析了上海天文台丹容等高仪1960～1978年的观测资料，得到了空间自由章动在纬度和时间资料中引起的周期、振幅分别为P2，1=208平太阳日、A1=0。

The specific research contents include: celestial coordinates The establishment of the Department; Sunday apparent motion of celestial bodies and the anniversary of the apparent motion; celestial parallax, atmospheric refraction, optical aberration, precession, nutation theory and applications; astronomical time measurement principles and time systems; depending on the location of celestial bodies return calculation methods.

具体的研究内容有：天球坐标系的建立；天体的周日视运动和周年视运动；天体的视差、大气折射、光行差、岁差、章动的理论及应用；天文时间计量的原则和时间系统的建立；天体视位置的归算方法等。

These changes are mainly for the following reasons: With the Earth Observatory plate movement; Earth deformation; station plumb line changes; station external conditions, weather conditions change; instruments and observer error, as well as stars form stellar declination, on their own, the annual optical aberration constant and nutation constant errors.

这种变化主要由于以下几种原因：观测站随地球板块的运动；地球形变；测站铅垂线的变化；测站的外界条件、气候条件的变化；仪器和观测者的误差以及星表的恒星赤纬、自行、周年光行差常数和章动常数的误差。

All of this is a necessary basis for nutation gear design and research.

为章动齿轮传动的设计与研究提供了理论依据。

A parameter design method of nutation cross-feedback control is investigated.

研究了章动交叉反馈校正的参数设计方法。

Its values, determined from different kinds of observations and models are reviewed. Moreover, its relation to precession and its effect on nutation computation are discussed.

介绍了由不同的观测方法和模型给出的地球动力学扁率值，并讨论了它与岁差的关系和对章动计算的影响。

Under the effect of every order tidal moment, the expression of precession and nutation for the CIP axis is presented.

在各阶潮汐力矩的作用下，得到CIP轴岁差章动的表达式。

Precession and nutation of top and gyrosscope is discussed by elementary method,equations of motion are solved using simplified models, and an elementary analysis is made.

用初等方法讨论了陀螺与陀螺仪的进动及章动，用简化模型求解了运动方程，并给出了它们的初等分析。

Phenomena such as precession the slow roughly 25 000 year cycle of movement of the direction of the Earth's axis and nutation the continual "nodding" of the Earth's axis due mainly to tidal forces from the Sun and Moon all have to be taken into account when defining a Universal Reference frame.

现象，如进动，慢，大约25 000年的周期，对地球的轴的方向运动，章动，不断"点头"地球的轴心，这主要是由于来自太阳和月亮，所有潮汐力量要考虑到当定义一个通用参考框架。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。