期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Atmospheric Excitation of Time Variable Length-of-Day on Seasonal Scales 被引量:4
1
作者 Li-Hua Ma Yan-Ben Han 《Chinese Journal of Astronomy and Astrophysics》 CSCD 2006年第1期120-124,共5页
We use the method of wavelet transform to analyze the time series of the Earth's rotation rate of the EOP (IERS) C04. The result shows that the seasonal (annual and semiannual) variation of the length-of-day (LO... We use the method of wavelet transform to analyze the time series of the Earth's rotation rate of the EOP (IERS) C04. The result shows that the seasonal (annual and semiannual) variation of the length-of-day (LOD) has temporal variability in its period length and amplitude. During 1965.0-2001.0, the periods of the semiannual and annual components varied mainly from 175-day to 190-day and from 360-day to 370-day, respectively; while their amplitudes varied by more than 0.2 ms and 0.1 ms, respectively. Analyzing the axial component of atmospheric angular momentum (AAM) during this period, we have found that time-variations of period lengths and amplitudes also exist in the seasonal oscillations of the axial AAM and are in good consistency with those of the seasonal LOD change. The time variation of the axial AAM can explain largely the change of the LOD on seasonal scales. 展开更多
关键词 Earth rotation -- seasonal variation -- wavelet transform
下载PDF
Solving two-dimensional Volterra-Fredholm integral equations of the second kind by using Bernstein polynomials 被引量:1
2
作者 M.Sh.Dahaghin Sh.Eskandari 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2017年第1期68-78,共11页
In this paper, we present a numerical method for solving two-dimensional VolterraFredholm integral equations of the second kind(2DV-FK2). Our method is based on approximating unknown function with Bernstein polynomi... In this paper, we present a numerical method for solving two-dimensional VolterraFredholm integral equations of the second kind(2DV-FK2). Our method is based on approximating unknown function with Bernstein polynomials. We obtain an error bound for this method and employ the method on some numerical tests to show the efficiency of the method. 展开更多
关键词 Volterra approximating approximate variational proof iterative uniformly exact wavelet inequality
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部