查询词典 radio-frequency spectrum

The first successful radio range-finding experiment occurred in 1924, when the British physicist Sir Edward Victor Appleton used radio echoes to determine the height of the ionosphere, an ionized layer of the upper atmosphere that reflects longer radio waves.

首次成功的无线电范围内调查试验发生在1924年，当英国物理学家尤德爵士维克多阿普尔顿使用的无线电回波，以确定高度，电离层，电离层的上层大气，反映了较长的无线电波。

Later, he competed in a spelling competition that was broadcast on radio. The radio announcer told Willis that he should work in radio.

后来，他参加了一次听广播拼写比赛，这家广播电台的主持人对威利斯说，他应该到广播电台工作。

It launched on shore more than two omnidirectional radio beacon stations or radio stations to wave direction , to determine the ship's position can also be used to determine the objective of launching radio waves ...

它以岸上两个以上全方向发射的无线电指向标台或无线广播电台的来波方向，来决定船位，也可用于测定发射无线电波的目标所在。。。

For navigation of ships and aircraft the radio range, radio compass, and radio time signals are widely used.

为船和航空器的航海无线电范围，无线电罗盘，和无线电时间信号广泛被应用。

VHF and HF radio are fitted, together with a radio compass and radio altimeter.

甚高频和高频无线电都装上了无线电罗盘和无线电高度表一起。

For the first time, we study the radio afterglow behavior during the trans-relativistic phase of the fireball shock wave. Considering the trans-relativistic shock dynamic and the synchrotron self-absorption effect of the relativistic electrons on the radio emission, we find that the dense medium model can not only explain the fast decline of the X-ray and optical afterglows of GRB980519, but also account for its radio afterglow quite well.

我们首次研究了致密介质情形下射电余辉在跨相对论阶段的行为，发现考虑到激波的跨相对论动力学和相对论电子的同步自吸收效应对射电辐射的影响，致密介质模型既可以解释GRB980519的快速衰减的X射线和光学余辉，也可以很好地解释其射电余辉的特点。

It is called a radio telescope because a radio antenna is used to observe radio waves emitted by astronomical sources.

它被称为射电望远镜，因为收音机的天线是用来观察天文活动所排放的无线电波。

Sardar: Radio label shows Made in Japan but radio says this is 'All India Radio!

收音机上的标签说是日本生产的，但收音机里说的却是这是' 印度广播电台

Peter got his first break in the radio industry presenting a specialist programme for blind people on 'BBC Radio Solent', at a time when it was common for local radio stations to broadcast such shows.

Peter首次在电台主持盲人节目是在南安普顿的地方电台，这个时段在他的节目播出前是播放娱乐节目的。

Currently there are two kinds of cognitive radio: overlay cognitive radio and underlay cognitive radio.

近来的很多研究和测量表明，频谱拥塞重要是由频谱分配和使用的低效率导致的。

We got alerted a couple of times while we were down south that HETs were on the way to bring us back up north because things were going to go hot again, but it was just rumors.

南下的途中我们不只一次得到警告说重型装备运输车将拉着我们重新北上，因为局势正在变得重新紧张起来，但这只是谣传。

It's the one where they find the ghost in the salt mine.

这一集是演他们在盐矿找到鬼