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利用本征模态函数的正交分解方法对日长(LOD,length of day)数据序列进行分解,得到了日长变化的101个正交本征模态函数.通过对其中几个主要模态函数进行分析,发现日月地的相对位置与其中几个模态函数极值发生的时间极其吻合,并据此推断出日长变化的主要激发源.同时还发现日长变化存在准周期约为206 d的波动. 相似文献
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A complete set of one-month Acoustic Doppler Profiler (ADP) current data at a station in the southern Yellow Sea (SYS) is analyzed using the rotary spectrum method. The results revealed different rotary properties between barotropic and baroclinic tidal currents. The barotropic and baroclinic tidal currents rotate elliptically counter-clockwise and clockwise, respectively. Meanwhile, baroclinic bottom tidal currents are almost along-isobath. The baroclinic cross-isobath velocities attenuate quickly at the bottom, implying important effects of bottom topography on the cross-isobath motions. 相似文献
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A new method is proposed to inverse normalization data of hidden variables in a dynamical system by embedding a time series
in multidimensional spaces and applying a normalization analysis to the conditional probability density of points in the reconstructed
phase spaces. The method is robust in the application to Lorenz system and 4-dimensional R?ssler system by testing quantitatively
and qualitatively the correlation coefficient between inverse data and original data in time domain and in frequency domain,
respectively. By applying the method to analyzing the South China Sea data, the normalization data of wind speed is extracted
from the sea surface temperature time series. 相似文献
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应用相空间理论对赤道单站日表层水温及青岛月平均气温的９点滑动平均资料进行了分析,结果表明：青岛月平均气温的９点滑动平均的相关维数和嵌入维数分别为５．８３、８,当反厄尔尼诺发生时赤道日ＳＳＴ的相关维和嵌入维数分别为３．９３、１１,当厄尔尼诺发生时其相关维数和嵌入维数分别为４．３７、９。揭示了无论是厄尔尼诺还是反厄尔诺发生赤道日ＳＳＴ都具有混沌特征,并且厄尔尼诺发生其内部结构复杂化使得支撑奇怪吸引子的 相似文献
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Effective elastic properties of spherically anisotropic piezoelectric composites, whose spherically anisotropic piezoelectric inclusions are embedded in an infinite non-piezoelectric matrix, are theoretically investigated. Analytical solutions for the elastic displacements and the electric potentials under a uniform external strain are derived exactly. Taking into account of the coupling effects of elasticity, permittivity and piezoelectricity, the formula is derived for estimating the effective elastic properties based on the average field theory in the dilute limit. An elastic response mechanism is revealed, in which the effective elastic properties increase as inclusion piezoelectric properties increase and inclusion dielectric properties decrease. Moreover, a piezoelectric response mechanism, of which the effective piezoelectric response vanishes due to the symmetry of spherically anisotropic composite, is also disclosed. 相似文献
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本文根据混沌系统奇怪吸收子在相空间中的伸缩和折叠的几何特征,建立了单纯形投影算子（ｓｉｍｐｌｅｘｐｒｏｊｅｃｔｉｏｎｏｐｅｒａｏｒ）预测方法,该方法主要侧重考虑了被预测点的局部非线性特征及Ｌｙａｐｕｎｏｖ特征指数,避免了传统预测函数和方程的模拟问题,减少了模拟参量,在Ｌｏｒｅｎｚ方程和Ｌｏｇｉｓｔｉｃ映射资料进行预测分析的结果表明,此方法简单易行,缩短了计算时间,在预测时间尺度及精度上具有较强的预 相似文献
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应用相空间理论对赤道单站日表层水温及青岛月平均气温的９点滑动平均资料进行了分析,结果表明：青岛月平均气温的９点滑动平均的相关维数和嵌入维数分别为５．８３、８,当反厄尔尼诺发生时赤道日ＳＳＴ的相关维和嵌入维数分别为３．９３、１１,当厄尔尼诺发生时其相关维数和嵌入维数分别为４．３７、９．揭示了无论是厄尔尼诺还是反厄尔尼诺发生赤道日ＳＳＴ都具有混沌特征,并且厄尔尼诺发生其内部结构复杂化使得支撑奇怪吸引子的雏数增加,而嵌入维数减少．这种现象是由于表层水温所隐含非线性作用显著增强所导致．根据以上分析结果应用单纯形投影算子（ｓｉｍｐｌｅｘ ｐｒｏｊｅｃｔｉｏｎ ｏｐｅｒａｔｏｒ）预测方法对赤道单站日ＳＳＴ和青岛月平均气温的９点滑动平均资料进行了预测,其前８点最大相对误差分别为０．４２％,７．４％． 相似文献