複雜系統之簡介(梁鈞泰) - 中研院物理研究所- Academia Sinica

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Hu et al videotaped striders at 500 fps, showing no substaintial surface waves, but there are vortices beneath the water surface. The vortex filament cannot start and end in bulk, it must be U-shaped. So, the legs stroke the water like the oars of a rowing-boat,sending vortices backward to propel itself forward.
The balance of momenta For dipolar vortices at wake of stroke: Speed V=4 cm/s, radius R=4mm, Mass M=2 π R 3 /3, MV=1 g cm/s, For water Strider: v=100cm/s, m=0.01g, mv=1 g cm/s Estimation of capillary wave packet momentum gives 0.05 g cm/s
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Introduction to Complex Systems
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複雜系統之簡介(梁鈞泰) - 中研院物理研究所- Academia Sinica

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