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There are 23 papers published in subject: > since this site started. |
Results per page: | 23 Total, 3 Pages | << First < Previous 1 2 3 |
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1. Time-domain calculation of acoustical wave propagation in discontinuous media using an improved acoustical wave propagator | |||
Lu Jing ,Pan Jie ,Xu Boling | |||
Physics 10 November 2006 | |||
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Abstract:Acoustical Wave Propagator (AWP) scheme involves effective time-domain calculation of sound propagation using the combination of Chebyshev polynomial expansion and Fourier pseudospectral method. The accuracy of this scheme degrades when the media has discontinuities due to the well-known Gibbs phenomenon. In this paper, several issues concerning AWP are addressed including an analysis of the effect of Gibbs phenomenon on the accuracy. A mapped pseudospectral method is proposed wherein the grid points are redistributed with the emphasis across the media discontinuities by a pre-determined smooth mapping curve, then the spatial derivatives are calculated through a modified Fourier pseudospectral method. Using this method, the influence of the Gibbs phenomenon is effectively alleviated while the computational efficiency of AWP is still maintained. The superiority of this improved AWP scheme is illustrated by three 1-D numerical examples. | |||
TO cite this article:Lu Jing ,Pan Jie ,Xu Boling . Time-domain calculation of acoustical wave propagation in discontinuous media using an improved acoustical wave propagator[OL].[10 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9446 |
2. Atomistic origin and temperature dependence of Raman optical redshift in nanostructures: a broken bond rule | |||
Sun Changqing | |||
Physics 11 August 2006 | |||
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Abstract:It turns out that: (i) the size-induced redshift of Raman optical modes results from the effect of bond order deficiency of atoms in surface skins and its consequences on the force constant of bonds between the under-coordinated surface atoms; (ii) the temperature-induced redshift arises from thermally-induced bond expansion and bond weakening | |||
TO cite this article:Sun Changqing. Atomistic origin and temperature dependence of Raman optical redshift in nanostructures: a broken bond rule[OL].[11 August 2006] http://en.paper.edu.cn/en_releasepaper/content/7879 |
3. Elucidating Si–Si Dimmer Vibration from the Size-Dependent Raman Shift of Nanosolid Si | |||
L. K. Pan,Sun Changqing,L. K. Pan | |||
Physics 26 April 2006 | |||
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Abstract:A combination of the recently developed BOLS correlation [Sun, Phys. Rev B 72m 134301 (2005)] and the new freedom of size has allowed us to elucidate information about the vibration frequency of an isolated Si-SI dimer by match prediction to the measured size dependence of Raman Optical red shift of Si. | |||
TO cite this article:L. K. Pan,Sun Changqing,L. K. Pan. Elucidating Si–Si Dimmer Vibration from the Size-Dependent Raman Shift of Nanosolid Si [OL].[26 April 2006] http://en.paper.edu.cn/en_releasepaper/content/6398 |
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Results per page: | 23 Total, 3 Pages | << First < Previous 1 2 3 |
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