查询词典 radio frequency

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。

Article 16 The operating unit or operator of satellite communication networks shall abide by the laws and regulations of the State on radio administration, be subject to the supervision and inspection of the radio administration bodies, and cooperate with the radio administration bodies to manage the earth stations within the networks.

第十六条卫星通信网运营单位或经营者应当遵守国家无线电管理的法规、规章，接受无线电管理机构的监督检查，配合无线电管理机构对网内地球站进行管理。

Even thinking of Fishing in the rever near my home, this is also my hobby, a person with a Yugan transferred to the radio favorite radio station, it is not listening to the CVC, the Australian radio that in the school i am unable to listen to.

这几天一直吃不下饭，还想吃吃家里做的饭菜。更想到家乡的那条河钓鱼，这也是我的爱好，一个人拿着鱼竿把收音调到最爱的电台，很就没有收听CVC了，那个澳洲电台，在学校一直没法收听，很想主播大为，红苹果，还有磊石。

In the second chapter, the author forecast the developing trend of trunked radio technology and makes the verdict that IP trunked radio technology will be a milestone of trunked radio technology in its developing history.

第二章对集群通信技术的发展趋势进行了预测，得出 IP 集群通信技术是集群通信技术发展史上的一次技术飞跃的结论。

Radio Netherlands Worldwide (RNW, short for Radio Nederland Wereldomroep in Dutch) is a public radio and television network based in Hilversum

是一家总部设在Hilversum的公共电台和电视网络，向荷兰境外的国际听众制作和传播新闻。

In a radio wave absorber (10), four hollow tetrahedrons (20) each of which has one open surface are connected such that a surface (20a) opposed to the open surface of the hollow tetrahedron (20) forms a side of a hollow pyramid (22). The radio wave absorber (10) is composed of a radio wave absorbing member shaped like a thin plate.

该电波吸收体(10)呈按照下述方式连接而形成的形状，该连接方式为将4个一面开口的中空四面体(20)以开口面相对的面(20a)作为中空棱锥(22)的侧面的方式形成。

Based on a qualitative analysis of the data of the type IV radio burst and accompanying phenomena (post flare loops, radio pulsation in the decaying phase,multi-band emissions and mass ejection etc.)associated with the white light flare of 1991 June 6, it isproposed that the WLF and radio burst come from the sameelectron accelerating area in the low corona.

通过1991年6月6日共生太阳白光耀斑的射电运动IV型爆发及其伴随现象(包括耀斑后环、爆发衰减相的射电脉动、多波段射电辐射和太阳物质抛射等)观测资料的分析，定性地探讨了WLF的起源、加热机制和发射地点的问题。

The basic principle and optical telescopes are similar not only to receive light waves but the radio waves .1932 years Jansky first in the world to detect extraterrestrial radio waves, thus marking the birth of radio astronomy.

其基本原理与光学望远镜相似，唯接收的不是光波而是射电波。1932年央斯基在世界上第一个探测到地外射电波，从而标志着射电天文学的诞生。

The RTU-250 Radio/Telephone Interface Unit interfaces the transmitter and receiver of a radio system to a telephone network so that phone calls may be relayed over a radio link.

RTU-250电台/电话界面装置将电台系统中的发射机和接收机同电话网络连接起来，令电话可以转接到无线电链路中。

Based upon our first paper and continuing the "Standard candle" classification by use of the component linear distance D, we attain to the following statistical correlation of some type of Quasars with largest angular diameter Q_: the correla- tion between visual magnitude and redshift; the correlation between its absolute magnitude, radio-luminosity of single frequency, integral radio Iuminosity, colour in- dex difference Q and D.

本文在第I部分的基础上，继续用类星体射电子源线距D进行"标准烛光"分类，经过统计分析，得到了子源角径最大的一类类星体的一些统计规律：它的视星等与红移之间，它的绝对星等、单频射电光度、积分射电光度和色指数差Q与D之间有很好的相关性等。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48