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理学院“青年学术论坛”第41期

2015/3/4镜像同步0 回复

理学院“青年学术论坛”第41期讲座题目：Accurate and efficient computation of some nonlocal potentials based on Gaussian-sum approximation 主讲人：张勇博士(维也纳大学)主持人：陈秀卿教授时间：2015年3月5日（周四）上午10:00-11:00地点：主楼1214 主要内容：We introduce an accurate and efficient method for the evaluation of a class of free space nonlocal potentials, such as the free space Coulomb and Poisson potential in 2D/3D and dipolar potential in 2D/3D. Starting from the convolution formulation, for smooth and fast decaying densities, we make a full use of the Fourier pesudospectral (plane wave) approximation of the density and a separable Gaussian sums approximation of the kernel in an interval where the singularity point (the origin) is excluded. Hence, the potential is split into a regular integral and a correction integral, and the latter is well resolved utilising a low-order Taylor expansion of the density. Both can be computed with fast Fourier transforms (FFT). The method is accurate (14-16 digits), efficient (O(N log N) complexity), low in storage, easily adaptable to other different kernels, applicable for anisotropic densities and highly parallel able. 主讲人简介: 请见附件附件：Yong-Cv1.pdf 理学院 2015年3月3日 http://portal.bupt.edu.cn//html/main/col38/2015-03/04/20150304090153905291932_1.html

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