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Three-dimensional(3D)unsteady compressible flow over an open cavity and the relevant aeroacoustics are studied using a hybrid LES-acoustic analogy method.

使用大涡模-声学比合的方法,研究三开式空腔的非定缩过流及其关的气动声学问题。

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化学 Crash Course

Most liquids are less dense and more compressible than their corresponding solids, but only slightly so.

与相应的固体相比,大多数液体的密度较低且可压缩性更高,但仅略微如此。

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Aggregated diamond nanorods, or hyperdiamonds, if you wanna sound cool, these are the hardest, most dense, and least compressible material we know of.

刚石纳米棒,或超级刚石,更酷的是,这些是所知的最坚硬、密度最高,几乎无法压缩的材料。

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In general, metal foams are useful for high-tech shock and impact absorbers, the gas inside makes them extremely compressible, so they can absorb a lot of mechanical energy, while still retaining some of the strength and durability of a metal.

总之,属泡沫对高科技震动和压力吸收的帮助很大,内部气体让物质极度压缩,可吸收很多机械能,而且依然保留属的强度和耐用性。

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