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Effect of Resonance on the Motion of Two Cylindrical Rigid Bodies
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作者 M. R. Hassan Baby Kumari +2 位作者 Md. Aminul Hassan Payal Singh B. K. Sharma 《International Journal of Astronomy and Astrophysics》 2016年第4期555-574,共20页
The effect of resonance on the motion of two cylindrical rigid bodies has been studied in the light of Bhatnagar [1] [2] [3] and under some defined axiomatic restrictions. Here we have calculated variation in Eulerian... The effect of resonance on the motion of two cylindrical rigid bodies has been studied in the light of Bhatnagar [1] [2] [3] and under some defined axiomatic restrictions. Here we have calculated variation in Eulerian angles due to resonance in terms of orbital elements and unperturbed Eulerian angles. 展开更多
关键词 Inertia Ellipsoid Ellipsoids of Revolution Symmetrical Bodies Orientation of the Bodies Principal Axes Eulerian Angles Critical Points Perturbations averaging of hamiltonian RESONANCE
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fGn激励下非线性系统近似方法适用性的解析分析 被引量:1
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作者 邓茂林 朱位秋 《振动工程学报》 EI CSCD 北大核心 2022年第5期1076-1083,共8页
由于受分数高斯噪声(fGn)激励的非线性系统响应不再具有马尔科夫性,基于扩散过程的理论方法不能直接用于研究此类问题。作为近似方法,宽带噪声激励的拟哈密顿系统随机平均法已经被用于解决此类问题。虽然,该理论方法在响应预测和可靠性... 由于受分数高斯噪声(fGn)激励的非线性系统响应不再具有马尔科夫性,基于扩散过程的理论方法不能直接用于研究此类问题。作为近似方法,宽带噪声激励的拟哈密顿系统随机平均法已经被用于解决此类问题。虽然,该理论方法在响应预测和可靠性分析方面取得了较好的效果,但是到目前为止还没有做过对近似方法的误差和适用性的解析分析。在本研究中,将近似方法用于分析fGn激励下的单自由度非线性系统,得到了系统响应的近似解析解,再结合已报道的精确解析解,用渐近分析的方法进行了误差分析,从而对近似方法的适用性进行了论证,为将来能够进一步扩展近似方法的应用提供了理论依据。 展开更多
关键词 非线性系统 宽带噪声 分数高斯噪声 拟哈密顿系统随机平均法
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Future Theoretical Approaches in Nuclear Magnetic Resonance 被引量:1
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作者 Eugene Stephane Mananga 《Journal of Modern Physics》 2014年第4期145-148,共4页
Solving a time-dependent linear differential equation towards obtaining evolution operators is a central problem in solid-state nuclear magnetic resonance. To this end, average Hamiltonian theory and Floquet theory ha... Solving a time-dependent linear differential equation towards obtaining evolution operators is a central problem in solid-state nuclear magnetic resonance. To this end, average Hamiltonian theory and Floquet theory have been the two commonly used theoretically methods in spin dynamics of NMR. We recently introduced the Floquet-Magnus expansion approach and here, we present the methodology of potentials future theoretical approaches such as the Fer expansion, Chebyshev expansion and Cayley transformation that could be useful tools for numerical integrators and simulations of spin dynamics in NMR. 展开更多
关键词 SOLID-STATE NMR averagE hamiltonian THEORY FLOQUET THEORY FLOQUET Magnus THEORY FER Expansion
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固体高分辨NMR中的DANTE实验
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作者 丁克洋 杜有如 叶朝辉 《波谱学杂志》 CAS CSCD 1992年第4期313-320,共8页
该文给出了旋转固体的DANTE实验的严格的理论分析,在化学位移相互作用坐标系中,应用平均Hamiltonian理论求出了自旋体系运动方程的零级近似解,从而讨论了DANTE序列在不同情况下的选择性。
关键词 固体 DANTE实验 NMR 选择性激发
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