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941.
C. Poulain N. Mazellier L. Chevillard Y. Gagne C. Baudet 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,53(2):219-224
We present the results of an experimental study of the spatial Fourier modes of the vorticity in a turbulent jet flow.
By means of an acoustic scattering setup we have recorded the evolution in time of Fourier modes of the vorticity field, characterized
by well defined wavevectors k.
By computing the auto-correlation of the amplitude of the Fourier modes we evidence that, whatever the length scale (or equivalently
k), the dynamic evolution of
the vorticity field involves two well separated time scales.
We have also performed the simultaneous acquisitions of pairs of Fourier modes with two wavevectors k and k'.
Whatever the spectral gap k- k', any pair of Fourier modes exhibits a significant cross-correlation over long time delays, indicating a strong statistical
dependence between
scales. 相似文献
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Robert J.M. Craik 《Applied Acoustics》2003,64(3):325-341
Although SEA is a suitable framework for predicting sound transmission through double walls it has been found that the standard method of computing the non- resonant coupling loss factor from a room to cavity underestimates the coupling. A revised model for computing this coupling loss factor is presented which gives much better agreement with measured data. This allows better predictions to be made of sound transmission through lightweight double walls. 相似文献
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声波干涉演示实验的探讨 总被引:2,自引:2,他引:0
从波的叠加原理和波的干涉条件出发对纵波的干涉问题进行了分析,在此基础上对声波干涉实验的关键、方法及注意事项做了讨论。 相似文献
947.
The Mixing Effect of Glycylglycine with KCl, KBr, and Na2SO4 from Volumetric and Viscometric Investigations at 298.15 K 总被引:1,自引:1,他引:0
The mixing effect of a simple peptide such as glycylglycine, in the presence of aqueous electrolytes, has been studied by examining their volumetric and viscometric behavior. The increase in the apparent molar properties of both glycylglycine and electrolytes is attributed to the interactions present among cation, anion, the head groups of the peptide, and the peptide bond. Simple equations are developed to account for such interactions with a view to correlate apparent molar properties of glycylglycine and electrolyte in their aqueous mixtures. Transfer properties of both glycylglycine and electrolyte are investigated in order to understand the changes in the property of one component by the addition of another. These interactions are also supported by viscosity data, for which a simple model is developed to correlate the variation in viscosities with composition of a component. 相似文献
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