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使用波数谱绘制海浪波幅畸变的校正 被引量:6
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作者 陈丽宁 金一丞 +1 位作者 任鸿翔 尹勇 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2015年第9期1617-1624,共8页
针对快速傅里叶逆变换形式Gerstner波绘制海浪出现波幅畸变的问题,提出使用波数谱绘制海浪波幅畸变的校正方法.首先重新推导了包含基元波振幅的快速傅里叶逆变换形式Gerstner波;然后用右侧Riemann求和对波数谱的定积分进行离散,离散积... 针对快速傅里叶逆变换形式Gerstner波绘制海浪出现波幅畸变的问题,提出使用波数谱绘制海浪波幅畸变的校正方法.首先重新推导了包含基元波振幅的快速傅里叶逆变换形式Gerstner波;然后用右侧Riemann求和对波数谱的定积分进行离散,离散积分域的边界值由快速傅里叶逆变换对波数向量的采样方式决定,得到基元波振幅的近似解;最后将该近似解代入上述推导所得的形式中,得到傅里叶系数中包含波数谱和离散积分域面积的快速傅里叶逆变换形式Gerstner波.实验结果表明,采用该方法可以准确地计算海浪势能和基元波振幅,绘制结果波形稳定,有效地解决了波幅畸变的问题. 展开更多
关键词 海浪绘制 Gerstner波 快速傅里叶逆变换 基元波振幅 波数谱 定积分离散
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Conservation Laws of a Discrete Soliton System
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作者 JI Jie ZHANG Da-Jun ZHANG Jia-Jiang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第5期1105-1108,共4页
In this paper, we obtain an infinite number of conservation laws for a discrete soliton system by using a solvable generalized Riccati equation.
关键词 Conservation law discrete soliton system Lax integrable
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Making Business of a Revolutionary New Technology The Eckert-Mauchly Company, 1945-1951
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作者 Lars Heide 《History Research》 2012年第8期477-489,共13页
The paper analyzes John Presper Eckert and John William Mauchly's endeavours to design, sell, and build the revolutionary new technology of the first-large and commercial computers. It discusses how Eckert and Mauchl... The paper analyzes John Presper Eckert and John William Mauchly's endeavours to design, sell, and build the revolutionary new technology of the first-large and commercial computers. It discusses how Eckert and Mauchly's conceptualization of the computer grew out of their Electronic Numerical Integrator and Calculator (ENIAC) and Electronic Discrete Variable Automatic Computer (EDVAC) projects at University of Pennsylvania. They incorporated their own business to gain profit from production and attain the freedom needed to develop their revolutionary new computer technology through a series of small and separate computer projects with private and government customers. The paper approaches innovation as a chaotic process and uses uncertainty to conceptualize the basic relations between actors and organizations. 展开更多
关键词 INNOVATION uncertainty John W. Mauchly John Presper Eckert UNIVAC mainframe computer
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