欧洲超级无线局域网的标准工作频率与 U-NII 相同。

The European HiperLAN standard operates in same frequency band as the U-NII.

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标准工作期间频率年计系数。

Standard work period frequency annualization factor.

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本文描述上海天文台为改善氢脉泽标准的频率稳定度和工作可靠性所采用的主要技术，同时给出了采用这些技术后氢脉泽的新的性能数据。

This paper describes approaches taken by the Shanghai Observatory to increase the frequency stability and operational reliability of its hydrogen maser. Performances of the new maser are given.

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