查询词典 radio-opacity

4The difference between a Tv set and a radio is that the former can receive images.

电视机与收音机的区别在于电视机能接收图像。

It has a differentiated technology with radio frequency cards, which is the main computer system as the core.

它与无线射频卡是一种有区别的技术，该技术主要是以计算机作为系统的核心。

Founder of communication, Welber Slarm, has given a clear description of "bipolar diffusionism":"the idea is transmitted through the leaders of radio broadcasting, newspapers and periodicals to the people who are not active in public communication"⑤.

传播学之父施拉姆对"两级传播"的解释是："概念往往从无线电广播和报刊流向舆论界的领导人，然后再从这些人流向人口中不那么活跃的部分"⑤。

A new kind of a radio frequency excited diffusively cooled gain slab waveguide CO2 laser was presented.

提出了一种新的射频激励增益波导阵列CO2激光器技术。

The Control System for Sealed-off and all-metal RF-excited CO_2 Lasers;2. An experimental study of 100W radio excited diffusively cooled all-metal rectangle waveguide CO_2 laser was carried out.

对新型百瓦级射频激励扩散型冷却全金属矩形波导CO2激光器进行了实验研究，实验中采用了CASE-I平行平面腔，试验结果表明，在采用10%透过率的输出镜时，激光输出最大功率达到146 W，电光转换效率达到17。

Finally, the results of the digital simulation about radio amendatory channel are given in different trajectories.

最后，本文给出了无线电修正通道数据链路中导弹的无线电数据链路的一系列仿真曲线。

Digitalization and software radio is the development trend of communication system.

数字化和软件化成为了当今通信系统发展的趋势。

Direct IF or RF digitalization is one of the techniques of software radio.

而中频或射频的直接数字化是软件无线电关键技术之一。

In other cases, such as trains, the alert will be transmitted digitally, or by radio.

在其他情况下，如火车，警报会通过数字或广播方式发送。

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。