共查询到10条相似文献,搜索用时 62 毫秒
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The convergent iterative procedure for solving the groundstate Schr?dinger
equation is extended to derive the excitation energy and the wavefunction of the
low-lying excited states. The method is applied to the one-dimensional quartic
potential problem. The results show that the iterative solution converges rapidly
when the coupling g is not too small. 相似文献
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利用Fernald迭代后向积分法反演低空探测机载激光雷达消光系数 总被引:2,自引:0,他引:2
进行低空探测的机载激光雷达消光系数反演存在着标定点选取和标定值确定两大困难.Fernald迭代后向积分法能够在不利用其它辅助没备的情况下,找到进行低空探测机载激光雷达消光系数反演所需的标定点和标定值.利用Fernald迭代后向积分法和Palm et a1.(2002)方法分别对青岛机载激光雷达实验数据进行处理,得到的两条消光系数廓线基本吻合.定蜃分析显示:利用Fernald迭代后向积分法进行机载激光雷达消光系数反演时,激光雷达比对消光系数反演结果影响很大;标定点的消光系数值及迭代判据的取值对机载激光雷达消光系数反演的结果影响较小.Fernald迭代后向积分法为不用其它辅助设备进行低空探测的机载激光雷达消光系数反演提供了一种可行的范例. 相似文献
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建立了一种求解标准对力模型的新迭代方法。该方法基于标准对力模型的多项式方案,为球形和形变系统提供了方便的初始值预测。特别是对于大尺寸系统,该方法将求解k对多项式的系统方程式简化为分步求解1对多项式系统的迭代过程,并通过快速Newton-Raphson以及Monte Carlo采样算法逐步提供初始值预测。通过扩展,本算法还可用于解决Gaudin型量子多体问题,例如考虑超过100条轨道、50对的大尺寸系统,以及超形变核、核裂变的研究中。A new iterative approach for solving the standard pairing problem is established based on polynomial approach. It provides an efficient way to derive the particle-number conserved pairing wave functions for both spherical and deformed systems, especially for large-size systems. The method reduces the complexity of solving a system for k-pairs polynomial equations into a system for one-pair polynomial equation, which can be efficiently implemented by the Newton-Raphson algorithm with a Monte Carlo sampling procedure for providing the initial guesses step by step. The present algorithm can also be used to solve a large class of Gaudin type quantum many-body problems as a more than 100 orbitals and 50 pairs system such as super-heavy nuclei and nuclear fission. 相似文献
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An Iterative Two-Grid Method of a Finite Element PML Approximation for the Two Dimensional Maxwell Problem 下载免费PDF全文
Chunmei Liu Shi Shu Yunqing Huang Liuqiang Zhong & Junxian Wang 《advances in applied mathematics and mechanics.》2012,4(2):175-189
In this paper, we propose an iterative two-grid method for the edge finite
element discretizations (a saddle-point system) of Perfectly Matched Layer (PML)
equations to the Maxwell scattering problem in two dimensions. Firstly, we use
a fine space to solve a discrete saddle-point system of $H(grad)$ variational problems,
denoted by auxiliary system 1. Secondly, we use a coarse space to solve the
original saddle-point system. Then, we use a fine space again to solve a discrete$\boldsymbol{H}(curl)$-elliptic variational problems, denoted by auxiliary system 2. Furthermore,
we develop a regularization diagonal block preconditioner for auxiliary system 1
and use $H$-$X$ preconditioner for auxiliary system 2. Hence we essentially transform
the original problem in a fine space to a corresponding (but much smaller)
problem on a coarse space, due to the fact that the above two preconditioners are
efficient and stable. Compared with some existing iterative methods for solving
saddle-point systems, such as PMinres, numerical experiments show the competitive
performance of our iterative two-grid method. 相似文献
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A Fast High Order Iterative Solver for the Electromagnetic Scattering by Open Cavities Filled with the Inhomogeneous Media 下载免费PDF全文
Meiling Zhao 《advances in applied mathematics and mechanics.》2013,5(2):235-257
The scattering of the open cavity filled with the inhomogeneous
media is studied. The problem is discretized with a fourth order
finite difference scheme and the immersed interface method,
resulting in a linear system of equations with the high order
accurate solutions in the whole computational domain. To solve the
system of equations, we design an efficient iterative solver, which
is based on the fast Fourier transformation, and provides an ideal
preconditioner for Krylov subspace method. Numerical experiments
demonstrate the capability of the proposed fast high order iterative
solver. 相似文献
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