某些陶瓷还具有一些特殊性能：有些是磁性材料，有些是压电材料，还有些特殊陶瓷在极低温度下是超导体。

Some ceramics have special properties: some ceramics are magnetic materials; some are piezoelectric materials; and a few special ceramics are superconductors at very low temperatures.

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本发明理论是根据超导体完全抗磁性和电磁学理论，用机械办法使磁场力作功。

Based on the perfect diamagnetism of superconductor and electromagnetic theory, magnetic field force is used to do work mechanically.

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本文利用广义正则变换和自洽场方法，讨论了单个杂质对超导体的影响。证明在磁性杂质附近，可能形成一个束缚态的元激发，其能量位于能隙之中。

A generalized canonical transformation and a SCF method have been used to investigate the influence of isolated impurity atoms on the properties of superconductors.

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