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91.
92.
Measurements of multiphoton dissociation (MPD) of HDCO gas irradiated by intense CO2 laser pulses varying in shape and having a duration from 150 ns to ~ 1 μs are reported. It is found that for the same laser pulse energy the short pulses dissociated about an order of magnitude more molecules than the long pulses. Taking into consideration the collision-induced MPD of HDCO previously found, it is shown that to a reasonably good approximation, all the present MPD data for the different pulse durations can be represented on a single, smooth and sharply rising curve of yield versus intensity. This finding is in contrast to the flat intensity response at constant pulse energy found recently for collisionless MPD in SF6. 相似文献
93.
The effects of tri-linear modes on transport coefficients is illustrated by explicit calculations for the self-diffusion constant. In two dimensions the form of the asymptotic time behavior of the velocity autocorrelation function is changed from t-1 (bilinear modes) to (t log t)-1 (trilinear modes). Thus, no finite mode calculation in two dimensions can yield the correct asymptotic form. A heuristic self-consistent calculation including all mode orders yields the form [t log t]-1. In three dimensions, the form of the asymptotic time behavior is not changed when higher-order modes are included. 相似文献
94.
Slow dynamics of density fluctuations near the colloidal glass transition is discussed from a new viewpoint by numerically
solving a nonlinear stochastic diffusion equation for the density fluctuations recently proposed by one of the present authors
(MT). The effects of spatial heterogeneities on the dynamics of density fluctuations are then investigated in an equilibrium
system. The spatial heterogeneities are generated by the nonlinear density fluctuations, while in a nonequilibrium system
they are described by a nonlinear deterministic equation for the average number density. The dynamics of equilibrium density
fluctuations is thus shown to be quite different from that of nonequilibrium ones, leading to a logarithmic decay followed
by less distinct α- and β-relaxation processes.
Received 9 March 2002 and Received in final form 19 September 2002 相似文献
95.
96.
97.
Molecular hydrodynamic equations derived by linear response theory for inhomogeneous systems are investigated in two extreme cases: a simple fluid in a gravitational field (an example of a long-range inhomogeneity), and a simple fluid in the presence of a rigid flat wall described by an infinite potential step (an example of a short-range inhomogeneity). In both cases the phenomenological equations result when the molecular equations are smoothed over a length which is large compared to the correlation lenght. For these systems the local equilibrium assumption is shown to be valid. In addition it is shown how the usual slip boundary conditions arise as a consequence of the interaction which causes the short-range inhomogeneity. 相似文献
98.
99.
Speech analysis-synthesis system based on homomorphic filtering 总被引:2,自引:0,他引:2
A V Oppenheim 《The Journal of the Acoustical Society of America》1969,45(2):458-465
100.
A. Oppenheim 《Annali di Matematica Pura ed Applicata》1961,53(1):157-163
Summary In this note is obtained by a simple geometrical transformation a family of inequalities which connect the distances of an
internal point from the vertices of a triangle with its distances from the sides. Stronger forms of old inequalities are also
found.
To Enrico Bompiani on his scientific Jubiles 相似文献