排序方式: 共有19条查询结果,搜索用时 281 毫秒
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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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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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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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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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在海面波破碎区,假定随机粗糙的海面被两层不同散射性质的球形粒子覆盖,上层是由海面飞沫组成的球形Rayleigh粒子层,下层是由气泡组成的球形Mie粒子层,根据大量观测和实验的统计结果,确定了两层散射粒子的平均半径和单位体积的粒子数;并用迭代法求解随机粗糙海面上的两层粒子的矢量辐射传输方程.根据风波破碎时白冠覆盖率和海面飞沫、气泡的统计模型,给出了一个新的风驱海面的微波散射理论模型.利用这一模型定量地给出了海面后向散射系数和风速、视角、极化和白冠覆盖率等特征参量之间的函数关系,并研究了覆盖在波破碎区的散射粒子对海面后向散射系数影响程度. 相似文献
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利用有效介质近似理论, 在Pandey和Kakar的经验模式基础上提出了一个改进的研究强风驱动下白冠覆盖的海面有效发射率模式. 该模式讨论了白冠层中球形气泡、水滴、海-气温差对海面发射率的影响, 研究表明海面发射率随着海气温差的增加而增大. 同时, 通过引入白冠层的有效介电常数, 该模式考虑了白冠层的有效粒子的气泡结构、泡沫层厚度等物理参量对海面发射率的影响. 模式经Rose等人在完全泡沫情况下的实测数据验证, 得到了很好的一致性结果. 相似文献