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the secular variation
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     The Secular Variation of the Earth's Rotation Obtained from 171 Records of Lunar Occultation before 600 A. D. in China
     由南北朝以前171个月掩星记录所得到的地球自转长期变化
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     4) attempted to apply these data to study the secular variation of Earth's rotation and educed the change rate of LOD (length of day) is 1.8ms/cy.
     4)尝试应用 这些数据考察地球自转长期变化,得出日长变化为1.8 ms/cy.
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     Based on the spherical cap harmonic models of the geomagnetic field and its secular variation, the geomagnetic charts(F,X,Y,Z),the anomaly charts(ΔF,ΔX,ΔY,ΔZ) for 2000 and the secular variation charts(AF·U,AX·U,AY·U,AZ·U) for 2000~2005 are drawn.
     依据地磁场及其长期变化的冠谐模型 ,分别绘制2 0 0 0年中国地磁图 (F ,X ,Y ,Z)和异常磁场图 (ΔF ,ΔX ,ΔY ,ΔZ) ,以及 2 0 0 0~ 2 0 0 5年地磁长期变化图 ( ·F ,·X ,·Y ,·Z) .
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     THE SECULAR VARIATION OF GLOBAL LAND RAINFALL FIELDS IN SEPTEMBER-NOVEMBER FROM 1948~2001
     1948~2001年全球陆地9~11月降水的长期变化
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     732 Chinese lunar records are used to study the secular variation of the earth's rotation.
     地球自转长期变化的研究依赖于古代天象记录. 近年来这方面研究取得明显进展.
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  相似匹配句对
     The Singer of Secular World
     凡俗世界的歌者
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     Falling into the Secular World
     生命的世俗沦陷——“第三代”诗人生命哲学析疑
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     Secular Music To Be Taoism
     世俗音乐的道教化——关于全真道经韵音乐与世俗音乐关系的探讨
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     They have secular variation .
     它们都有明显的长期变化。
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     Secular Sublimity: Faust's Pursuit
     浮士德的追求:非宗教的宗教境界
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  the secular variation
The secular variation of the geomagnetic field in Egypt in the last 5000 years
      
Using these sequences, an attempt is made to trace the secular variation of the virtual geomagnetic dipole field characterized by the three first order spherical harmonic coefficients
      
Changes in multipole parameters are discussed in relation to the secular variation field and to theSchmidt eccentric dipole.
      
In paper I, (Mohandis [2]2)), the author contributes to the discussion of the origin of the secular variation of the earth's magnetic field.
      
This implies that the secular variation of the Earth's magnetic field over periods of time of 1000 years or more may be studied by measuring the directions of magnetisation at a series of points across the thickness of such a sheet.
      
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The monthly temperature charts of China during the period of 1909-1958 are used to analyze the secular temperature variations in China. The monthly temperature in China is classified into 5 ranks: cold (C), warm (W), slightly cold (Cw), slightly warm (Wc) and normal (N). The climatic variations of these 5 ranks of monthly temperature in China are tabulated in Table 1 and 2. From an analysis of Fig. 3-4, and Table 3, we find that the secular variations of warm and cold months. in China...

The monthly temperature charts of China during the period of 1909-1958 are used to analyze the secular temperature variations in China. The monthly temperature in China is classified into 5 ranks: cold (C), warm (W), slightly cold (Cw), slightly warm (Wc) and normal (N). The climatic variations of these 5 ranks of monthly temperature in China are tabulated in Table 1 and 2. From an analysis of Fig. 3-4, and Table 3, we find that the secular variations of warm and cold months. in China are definitely correlated with the cyclic variations of solar activity. It is also found, that once after a cold or a warm period (1-3 months) appears the probablity of occurrence of same trend of temperature in the following half year will be - greater than that of the opposite trend of monthly temperature. " .

本文根据1909—1958年五十年时期内,中国逐月的温度等级分布图探讨了我国温度的多年变化。根据温度等级分布图,把中国各月温度状况分为五类:即冷月、暖月、偏冷月、偏暖月和正常月。五类温度月份出现的气候特征见表1和表2。从图3—4和表3的分析,发现50年来在我国出现的暖月和冷月与太阳活动的周期性变化有一定的关联。在我国出现一次冷期或暖期(1—3月)之后的半年内,一般仍以出现同类温度符号的机率大于相反符号的机率。

The local deviations from the reference system of BIH(1968)in the observed UT1 of 18 observatories during 1950-1977 are used to compute the secular variations of longitudes of all the stations and to determine the angular velocities of American plates relative to Eurasian. The coordinates of the centre of rotation have been given by Le Pichon (1968, 1971).

本文用1950-1977年相对于BIH 1968年参考系统的18个天文台站的测时地方偏离值,计算了各台站的经度长期变化值.确定了美洲相对于欧亚板块的经度年变化值,并且求出此两板块的相对转动角速度.转动极的坐标取自Le pichon(1968、1971年)提供的值. 本文还对我们计算出来的结果与其他作者给出的结果进行了一些比较.

After an analysis of the secular variation of the common Z-Term in latitude, the existence of the non-polar long period terms in latitude is verified. Together with the spectral analysis of the path of secular polar motion and of the differences between different systems, a conclusion is suggested that these non-polar long period terms are not the common term existing in every latitude series, so they have influence on the path of secular polar motion.

本文从讨论纬度公共Z项长期变化的规律入手,证实了纬度非极变化中存在着某些长周期项。结合分析长期极移轨线和各系统间差异的谱结构,提出这些非极长周期项并不是所有的纬度序列所公有的,因而对长期极移的轨线造成影响。

 
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