查询词典 modulation

By utilizing the cross-gain modulation effect and the period-one oscillation harmonic frequency-locked in an optically injected semiconductor laser, we can extract the wavelength conversional individual channel optical clock from the optical-time-division-multiplexing signal. In a FP-LD, we numerically simulate the extraction of 20 GHz optical clock at 1550 nm from the 2×20 Gb/s OTDM signal at 1555 nm, and experimentally obtain the -105 dBc/Hz phase noise frequency division clock of 12.36 GHz to 6.18 GHz with simultaneous wavelength conversion from 1550.24 nm to 1545.91 nm.

采用一个FP半导体激光器作为全光分路时钟提取及波长转换器，数值模拟实现了从波长为1555 nm、速率为2×20 Gb/s的光时分复用信号中提取出波长转换为1550 nm、重复频率为20 GHz的分路光时钟，实验完成了从波长为1550.24 nm、重复频率为12.36 GHz光脉冲信号中提取出相位噪声为-105 dBc/Hz的波长为1545.91 nm、重复频率6.18 GHz的分频光时钟。

With the merits of space vector modulation: digitized control,harmonic decrease,high ratio of voltage used,fast dynamic response and so on,and at the same time deadbeat and DSP control is introduced, as well as two-loop control of the system,we gained power factor is near unit and current THD is well below 10% in our digitized arc welding power system.

基于空间矢量脉冲宽度调制技术的易于数字化、可降低谐波、电压利用率高、动态响应快等特点，引入无差拍思想、总体系统的双环控制思想和DSP控制，实现了功率因数为1，电流谐波畸变远小于10％弧焊电源系统的数字化。

Sub-femtosecond pulse, molecular modulation, high harmonic generation, spectral synthesis

中文关键词：亚飞秒脉冲，分子调制受激拉曼散射，高次谐波，频谱合成

The combination of OFDM and adaptive modulation and coding technique will provide high-speed data transmission, as well as improve the spectral efficiency.

OFDM与自适应编码调制技术的结合，可以在高速数据传输的同时有效提高系统的频谱利用率。

This paper deals with modulation formats for high-speed optical transmission and crosstalk in WDM optical networks, and the main research work and results are listed as follows.

本论文主要研究的是高速光传输中的新型调制格式和WDM光网络中的串扰，主要的研究内容及成果如下： 1。

High-speed digital modulation is one of the key technologies in communication system.

高速数字调制技术是通信领域的核心技术之一。

This theoretical system has achieved great progress in the area of natural language understanding, in which three key _points show its powerful potentiality in the modulation of the natural language description and treatment. In this paper, some points of view to HNC theory are presented.

它展示了自然语言理解的突破性进展，其三大理论要点集中体现了HNC理论在自然语言表述和处理模式上的突破，本文描述笔者对HNC理论这种"突破"的熟悉。

Since the varies of gun attitude angle and the vertical vector of the homograph plane are one-to-one, all the elements of modulation gun can be transformed into the calculation of the vertical vector angle, which avoids the calculation accuracy loss of the traditional approach under the condition of the tiny attitude angle disturbance.

由于火炮姿态角变化与相应平面的法向量是一一对应的，从而可将调炮诸元转化为法向量夹角来计算，这样可避免传统方案在微小姿态角扰动情形下导致的计算精度可能的损失。

This experiment aimed to investigate the modulation of hypotonicity on ATP-activated currents in primary sensory neurons. Whole cell-patch clamp recording was performed on cultured SD rat trigeminal ganglion neurons.

本实验应用全细胞膜片钳技术，在大鼠三叉神经节神经元上探讨低渗透压对ATP-激活电流的调制作用。

The traditional unitary space-time modulation system is generally based on the assumption of independent and identically distributed channel coefficients. However, this condition is hard to satisfy in practice, the spatial correlation among antennas deteriorates the performance.

传统的酉空时系统，通常假设信道衰落系数之间相互独立，这个条件在实际系统中却很难满足，天线之间的空间相关性造成系统性能恶化。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。