查询词典 radio frequency

Guglielmo Marconi, recognizing the possibility of using these waves for a wireless communication system, gave a demonstration (1895) of the wireless telegraph, using Hertz's spark coil as a transmitter and Edouard Branly's coherer (a radio detector in which the conductance between two conductors is improved by the passage of a high-frequency current) as the first radio receiver.

Guglielmo Marconi，认可使用这些波浪的可能性为一个无线通信系统，给了一次示范(1895)无线通信机，使用赫兹的火花卷因为发射机和Edouard Branly 的coherer (导率在二个指挥之间被高频率潮流段落改进)的一台无线电探测器如同第一无线电接收机。

This is the government hopes to radio management departments of radio frequency distribution system reform.

本文希望以此为政府无线电管理部门对无线电频率分配体系的变革提供参考。

Think about when the car is parked inside your garage attached to your house; and the remote starter is interfered by other radio frequency and accidently turned on.(Your naughty kid may do this. Or, some crooks try to open your garage door by emitting random radio signals; always lock the man door). The car will keep pumping carbon monoxide gas into the garage, and the poisonous gas will seep through any cracks or holes to get into the house. Your whole family may get kill because of this (sleeping through the night and never get up).

试想一下如果那辆汽车停在你的车库内，车库又是和房屋连在一起的那种，万一遥控启动装置被其他无线电频道干扰而意外启动（你家里顽皮的孩子可能会这样做的，又或者一些小偷也会故意发射一些随机的无线电信号来尝试打开你的车库门，因此门一定要锁好），汽车就会不断地在车库里面释放一氧化碳，而这些有毒的气体又会透过门缝或者孔洞钻进屋内，严重时甚至可以置全家人于死地。

And the channel composed of the new radio induction system for communication is different from the parameter-constant channel and the traditional parameter-changing channel, its parameter is decided by the mutual induction between its antenna and induction-cable, by the location of its antenna, by the signal frequency passing through, its parameter has nothing to do with the time parameter. The channel composed of the new radio induction system is a new parameter-changing channel independently of time for communication.

而且，由新型无线感应系统组成的信道既不是恒参信道，也不是一般目前所知的变参信道，其信道传递函数的幅值只与信号的频率有关，与系统中天线和感应电缆之间的互感和天线的位置有关，而与时间无关，其信道传递函数的相位只与天线的位置有关，而与时间无关，由新型无线感应系统组成的信道是一种不随时间变化的新型变参信道。

So it holds a ideal ability to anti-interference and has 2 scalar level resolution in location and measuring velocity than traditional radio induction technology. And the channel composed of the new radio induction system for communication is different from the parameter-constant channel and the traditional parameter-changing channel, its parameter is decided by the mutual induction between its antenna and induction-cable, by the location of its antenna, by the signal frequency passing through, its parameter has nothing to do with the time parameter.

而且，由新型无线感应系统组成的信道既不是恒参信道，也不是一般目前所知的变参信道，其信道传递函数的幅值只与信号的频率有关，与系统中天线和感应电缆之间的互感和天线的位置有关，而与时间无关，其信道传递函数的相位只与天线的位置有关，而与时间无关，由新型无线感应系统组成的信道是一种不随时间变化的新型变参信道。

TO this end the possibility of applying SSB broadcasting to radio has been suggested in the psat as a means of alleviating the overcrowede broacast bands of the frequency spectrum. In 1979 the World Administrative Radio Conference passed a resolution to improve the untilisation of the spectrum by the future application of SSB broadcasting.

作为减轻广播波段频谱过分拥挤的手段，应用单边带进行无线电广播的最终可能性过去曾被推荐。1979年世界无线电行政大会通过了一个决议以将来应用单边带广播来改善频谱的利用。

A major problem facing the radio communication industry is the limitation of the available radio frequency spectrum.

无线通信领域面临的一个主要问题是可使用的无线电频普有限。

The most efficient and most common circuit for radio-frequency selection and amplification used in radio receivers is the superheterodyne.

最高效率和多数最共同的电路为radio-frequency 选择和放大作用被使用在无线电接收机是超外差收音机。

Radio-frequency drying: A means of rapid drying by the use of certain radio-frepuency waves.

射频干燥：用某类无线电波的频率作快速干燥的一种方法。

Air wire is a important component of radio controller , it is composed of the series-parallel connection syntony circuit by day coil and capacitance, with rapid and intense high frequency interface coupling, one side needs and the card parameter mates, the feasible card is able to get the sufficient energy and the entire data , the data taking-over returns and with the card responding to , another aspect will mate with to enlarging a circuit again , makes the radio controller gain sufficient electric energy in the process of read-write card.

天线是射频控制器的一个重要组成部分，它由天线圈与电容组成串并联谐振回路，与高频接口紧密耦合，一方面要与卡片参数匹配，使得卡片能够得到充足的能量和完整的数据，并且把卡片的响应数据接收回来，另一方面又要与放大电路匹配，使射频控制器在读写卡过程中获得足够的电能。

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