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F. S. Zhang E. Suraud F. Spiegelmann V. Frayssé F. Chatelin R. Glowinski 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1995,35(2):131-139
From distance dependent tight-binding molecular dynamics simulations, we systematically study the Na n +Na n collision dynamics around the first two closed shells (n=8 and 20). We investigate the stability of sodium cluster dimers (Na n )2, for many events with random relative orientation at finite temperature, various impact parameters and incident energies. We find that (Na8)2, (Na9)2, (Na19)2 and (Na20)2 can exist during about 3000 fs in central collisions while they can exist up to about ten thousands fs in peripheral collisions with larger impact parameters in fusion mechanism at c.o.m energy per atomE cm/n=0.025 eV. We observe that the lower the incident energy, the longer the lifetime of the cluster dimers in both central and peripheral collisions. There is no apparent difference in the dynamical stability of (Na8)2 and (Na9)2, (Na19)2 and (Na20)2 although (Na8)2 and (Na20)2 are respectively slightly colder than (Na9)2 and (Na19)2 for the same incident energy per atom and the same impact parameter. 相似文献
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Arati Nanda Pati Kehinde Ladipo David Paniagua Roland Glowinski 《Mathematical and Computer Modelling》2011,53(1-2):21-41
In this article we discuss an application of a Lagrange multiplier based fictitious domain method for the simulation of moving leaflets in an unsteady flow generated by pressure gradients during the systolic phase of the cardiac cycle in three dimensional geometry. The mathematical model includes the Navier–Stokes equations coupled with the Euler–Newton equations describing fluid–structure interaction for the generalized Neumann boundary conditions on upstream and downstream boundaries. The solution method includes the finite element method combined with an operator-splitting scheme, where the fictitious formulation allows the flow calculations to be in a fixed rectangular parallelepiped to predict the dynamic structural positions and flow field during the valve opening and closing phases. 相似文献
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Mean square estimates are obtained for approximations to solutions of Zakai's equation which depend on the values of the observation process at the points of a regular partition in time 相似文献