| 单词 | hard sphere |
| 释义 | > as lemmashard sphere hard sphere n. chiefly Physics (as a concept in theoretical models) an idealized sphere that is perfectly hard, inelastic, and impenetrable. ΚΠ 1806 O. G. Gregory Treat. Mech. I. i. vi. 139 We conceive of a vault or arch in equilibrio to be composed of a series of very small hard spheres, of polished surfaces, touching one another. 1847 J. Herapath Math. Physics I. i. iii. 114 Suppose a hard sphere, moving freely with a given velocity, strike directly upon a hard fixed body. 1917 Physical Rev. 10 678 The so-called hexagonal close-packing..is one of the two alternative arrangements which the atoms would assume if they were hard spheres. 2012 M. Mézard & G. Parisi in P. G. Wolynes & V. Lubchenko Struct. Glasses & Supercooled Liquids iv. 187 Packings of hard spheres have a wider interest: they are related to important problems in information theory. < as lemmas |
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