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Working with water waves Physicists have devised a new way to focus water waves that could prove useful for wave-energy applications. Based on computer simulations and various theoretical techniques, Xinhua Hu and Che Ting Chan of the Hong King University of Science and Technology have shown that a periodic array of cylinders should be able to refract waves in any depth of water (Phys. Rev. Lett. 95 154501). The focussing effect has since been seen in experiments.
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