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港口吞吐量缩减反映了国际金融危机对港口业的冲击。天津港采取开拓货源,完善服务质量等措施,增强港口竞争力,抵御国际金融危机带来的负面影响,保证港口的稳定发展,促进区域的经济增长。 相似文献
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<正>本文试论企业档案数字化建设的相关问题,无疑会对档案数字化建设给以有益的参考与助推作用,值得同行业者给予关注档案数字化作为一个新的时代课题,需要厘清几个基本问题：什么是档案数字化?档案怎样数字化?档案如何数字化?要弄清上述问题,需要从信息化、数字化、智能化的角度,研究、探讨和处理档案数字化的基础性课题,以促进档案数字化工程在系统性管理、规模化增长以及动态化循环等方向的全面发展。 相似文献
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The technique of adaptive tree mesh is an effective way to reduce computational cost through automatic adjustment of cell size according to necessity. In the present study, the 2D numerical N-S solver based on the adaptive quadtree mesh system was extended to a 3D one, in which a spatially adaptive octree mesh system and multiple particle level set method were adopted for the convenience to deal with the air-water-structure multiple-medium coexisting domain. The stretching process of a dumbbell was simulated and the results indicate that the meshes are well adaptable to the free surface. The collapsing process of water column impinging a circle cylinder was simulated and from the results, it can be seen that the processes of fluid splitting and merging are properly simulated. The interaction of second-order Stokes waves with a square cylinder was simulated and the obtained drag force is consistent with the result by the Morison’s wave force formula with the coefficient values of the stable drag component and the inertial force component being set as 2.54. 相似文献
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