The first stage of the European Low Frequency Array (Lofar) telescope involves 96 radio antennae being erected this week in a field at the Chilbolton Observatory near Andover, Hampshire.

Lofar望远镜的一期工程位于罕布什尔的安多佛，由96个无线电天线组成的望远镜将在本周被安装完毕。

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The relationship between the sleep stage and the ultra-low frequency components of HRV is also considered.

在特征提取中还考虑了HRV中超低频分量和睡眠的关系。

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Use single stage version to reach the temperature of 20 K is a difficulty for high frequency pulse tube cooler (PTC). Multi-stage version is a popular method to reach the low temperature.

单级高频脉冲管制冷机直接降低到20 K以下温区存在很大困难，采用多级方案是高频脉冲管制冷机获得更低温度的主要方法。

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