查询词典 GHz

An integrated radio-over-fiber system with 60 GHz wireless mm-wave transmission by using optical carrier suppression is proposed and experimentally demonstrated.

实验研究了一种采用马赫-曾德尔电光调制器产生60 GHz光毫米波的方法和相应的光纤无线传输系统。

Carrier suppression double sideband optical signal with 40 GHz repetitive frequency is generated by using an optical phase modulator along with optical filtering technique.

在中心站采用相位调制器结合滤波的方法产生重复频率为40 GHz的载波抑制双边带毫米波信号，利用交叉复用器分离开毫米波信号的上下边带，其中的一个边带强度调制数据速率为2.5 Gbit/s的下行基带信号，另一个边带被发送到基站调制上行传输的基带数据。

Logitech Wireless Drum Controller that utilizes a 2.4 GHz wireless USB receiver to connect to PS3 system without wire is able to support up to 50 hours of battery life on 2x AA batteries.

罗技无线鼓控制器，它采用了2.4 GHz无线USB接收器连接到PS3的系统没有导线能够支持长达50小时的电池寿命2节AA电池。

We set out to find the generic multipartite GHZ state from the multipartite entangled coherent states, which is composed of fermions.

根据多粒子相干纠缠态得到一般的多粒子GHZ态模型，并利用Wigner函数绘出了相空间的准概率分布图像。

The 43 GHzυ=1, J=1-0 SiO maser emission toward M-type semi-regularvariable star VX Sagittarii was observed at 3 epochs during 1999 April-May using the VLBA.

我们利用VLBA在1999年4-5月份期间对M-型半规则变星VX Sgr拱星包层中的43 GHzυ=1，J=1-0 SiO脉泽进行了三个历元的观测。

An optimized method is presented to design the down scalers in a GHz frequency synthesizer.

介绍了一种应用于GHz级高速频率合成器的数模混合下变频模块。

Particle simulation indicates this device can produce of 4.0 GHz microwave with an averaged power of over 1.7 GW a quasi-single TM01 mode under the diode voltage of 700 kV and the beam current of 23 kA.

粒子模拟显示该结构在电压700 kV，电流23 kA的条件下，可输出功率大于1.7 GW，频率4.0 GHz，功率效率大于10％的微波。

The technology uses millimeter wave signals in the 28 GHz spectrum to transmit voice, video, and data signals within a three-mile to 10-mile radius.

这项无线技术使用 28 GHz 频谱内的毫米波信号在 3 米到10 米半径内传输语音、视频和数据信号。

The temperature rising mechanisms of manganese carbonate fines containing coal by microwave heating were discussed. The results show that, manganese carbonate fines containing coal have good characteristics of microwave heating and self-reduction. At the molar ratios of C atom to O atom as 1.1, 1.2 and 1.3 in the mixed materials, the averaged maximum temperature-rising rate of the mixed materials by microwave heating is 140.7 K/min at 1 473 K with the microwave frequency of 2.450 GHz. At the different containing coal ratios and heating temperatures, the value of the dielectric constant is big, 5.5, but that of the permeability is about 1, so the mixed materials belong to dielectric loss. The temperature rising performance depends chiefly upon the electromagnetic performance of materials, whose change is caused primarily by the chemical reaction, the changes of crystal structural , and the changes of defects state. The bigger the containing coal ratio, the better the absorptivity of microwave. At the same containing coal ratio, the higher the heating temperature, the weaker the absorptivity of microwave.

研究结果表明：含碳碳酸锰矿粉具有优良的微波加热特性和自还原性；在微波加热频率为2.450 GHz、碳氧原子摩尔比分别为1.1，1.2和1.3时，微波加热混合物料至1 473 K的升温速率平均最高达到140.7 K/min；不同的加热温度和配碳比下混合物料的介电常数较大，都在5.5左右，而磁导率为1左右，属介电损耗型；微波加热含碳碳酸锰矿粉的升温性能主要取决于含碳碳酸锰矿粉的电磁性能，而电磁性能的改变主要是由物料加热过程中产生的化学反应、晶体结构变化及缺陷状态的改变引起的；配碳比提高，物料吸收微波的能力有所提高；在相同的配碳比下，加热温度升高，吸收微波的能力有所减弱。

GHz ridge－loaded helical groove slow wave structure with a 20kV electron beam are given and the investigations of the effect of the ridge dimensions and electron beam parameters on the small signal gain are carried out. It is indicated from the calculation results that this type of structure is suitable for use as s SWS of high power, high gain but narrow passband millimeter TWT, of which the 3dB gain bandwidth is 3.4%. In order to increase the bandwidth, the reduction of the ridge gap or the increase of the electron beam current in an allowable range may be useful.

GHz的脊棱加载慢波结构的具体尺寸，并对此结构中小信号增益随脊尺寸的变化情况及电子注参数对其影响进行了研究，计算结果表明：此结构适宜于作为高增益窄带毫米波大功率行波管的慢波线，其3dB增益带宽为3.4%，为了展宽其工作带宽，可以适当减小间隙宽度，也可在一定范围内提高电子注电流。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐