Image: As it moves, a shark's tail (shown) creates two connected rings of moving water (blue and red represent opposing flows) that help make this fish such a powerful swimmer. (Brooke E. Flammang).

图：当鲨鱼移动时，尾巴会产生两个连接在一起的流动的水圈(蓝色和红色代表相反的水流)，这使得鲨鱼有着强大的游动能力。

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High voltage simulation tests were performed on the magnetic rings of three kind materials, i. e. ferrite, amorphous and microcrystalline and metallic magnetic powder core.

通过高电压模拟试验，观测了铁氧体、非晶磁芯和金属磁粉芯三种材料的磁环，特别观测了磁饱和的影响。

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Today it rings -- in the key of E -- each hour, while a series of quarter bells chime every 15 minutes.

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The idea is that visitors can design their own rings choosing stones and setting, and e-mailing the result home or to whomever needs a hint.

ECONOMIST: The V&A's new jewellery gallery has much to show off about