干涉
发表于 2025-3-23 13:15:22
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忘恩负义的人
发表于 2025-3-23 14:17:50
Atoms may be considered as small rigid balls. The packing of balls is an important concept in crystallography for the description of crystal structures, that is, the arrangement of atoms in a crystal. Many inorganic crystal structures are based on densest packings of balls.
Phagocytes
发表于 2025-3-23 21:17:26
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不妥协
发表于 2025-3-24 01:15:52
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Evocative
发表于 2025-3-24 05:31:01
Reduction of Quadratic Forms,For applications it is important to decide wether two different lattice bases belong to one and the same lattice T.. This problem is solved through the determination of an integral reduced form denoted here as ℤ-reduced.
acrobat
发表于 2025-3-24 07:44:50
Crystallographic Symmetry Operations,In this chapter We investigate the restrictions imposed by a lattice on the symmetry operations acting on a regular point system X C E..
Fatten
发表于 2025-3-24 14:34:06
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抑制
发表于 2025-3-24 16:51:41
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反复拉紧
发表于 2025-3-24 21:21:26
Space Groups,Up till now symmetry groups were considered only which leave at least one point fixed. This restriction is now removed and we investigate groups of symmetry operations which act transitively on a regular point system XCE..
ABASH
发表于 2025-3-24 23:23:53
Space Partitions,The investigation of space partitions permits us to get a better insight into the discontinuum. The most important result of this chapter will be the regularity condition which is discussed in section 9.4.