查询词典 modulation capability

Focusing on the problem that existing Space-Time Frequency-Shift Keying incurs a spectral efficiency loss, this paper proposes a novel ST-FSK based on Hadamard matrix modulation coined as HST-FSK.

摘要针对现有的空时频移键控频谱利用率低的缺陷，该文提出了一种基于Hadamard矩阵调制的空时频移键控方案。

With a 0.9 gain and an extraordinarily wide half angle of 70 degrees, this screen fabric offers excellent depth of modulation for even the most demanding high definition projection devices.

与0.9增益和一个非常广泛的一半角70度，此画面结构提供了很好的深度调制，即使最苛刻的高清晰度投影设备。

Usually, two-dimensional phase spectrogram can be expressed only as a plane picture with grayness-modulation, even as a half tone picture.

通常，二维的相位谱只能表示为灰度调制的平面图象甚至黑白半调图象。

It's about the analysis of technique of harmony of the work. It mainly discusses the technique of harmony of twenty-four preludes. It includes the analysis of chord form, terminal chord, half-step chord, sustained note and modulation method.

最和声技法的分析是本文的主体部分，针对二十四首前奏曲的和声技法展开论述，以和弦形态、终止式、半音化的和声语言、持续音的偏爱和转调手法五大部分为出发点，力求多角度、全方位地对音乐作品进行分析和研究。

In order to reduce the mental pressure and stay mental healthy, teachers should carry out self- modulation; on the other hand, organ and department should bear re sponsibility for teachers.

要应对心理压力，一方面教师要进行自我调适；另一方面有关部门有责任和义务帮助教师更好地适应改革，促进教师的心理健康。

The fast Hankel transformation algorithm is used to study the diffractive modulation property of laser beam propagation in high power laser facility.

文摘：利用快速汉克尔变换算法研究了高功率激光在自由空间传输过程中形成低频调制的规律，给出了衍射调制深度与光束宽度及传输距离等参数之间的变化关系。

By utilizing the cross gain modulation effect and the period 1 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 OTDM signal .

光注入半导体激光器会产生非线性单周期振荡特性，利用交叉增益调制效应及对单周期振荡的微波锁频效应，可从光时分复用信号中提取出波长转换的分路光时钟。

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

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。