查询词典 modulation

The polarization and magnetic rotation in some visible step-index single-mode fibers were investigated by frequency multiplication method based on the principle of magneto-optical modulation and with Lissajous figure method.

运用基于磁光调制原理的倍频法，并结合利萨如图形方法，对几种可见波段单模阶跃折射率光纤的偏振效应、磁(来源：A25BC论文网www.abclunwen.com)旋光效应做了考查和研究。

This paper is based on N-type MOS-HBT-NDR circuit to design a new type of logic gate circuits, The use of a monostable-bistable transition logic element logic gates to realize the principle of operation,,and NMOS devices to control the input stage circuit NDR circuit switching action, And the overall modulation circuits I-V characteristic curve.

中文摘要此篇论文是以N型MOS-HBT-NDR电路来设计新型逻辑闸电路，利用单稳态-双稳态传输逻辑闸(monostable-bistable transition logic element，MOBILE)电路的操作原理来实现，并以 NMOS元件来控制输入级电路中NDR电路的开关动作，进而调变整体电路的I-V特性曲线。

The servo control system combines position loop,speed loop,current loop with algorithm of space vector pulse width modulation.

系统采用位置、速度和电流环三环控制，并结合空间矢量脉宽调制算法。

Results of this thesis indicate that the novel polymer DFB gratings fabricated via UV-photopolymerization can achieve high refractive index modulation and low surface relief. Since this method has obvious predominance over other fabricating methods, it is believed to have promising application future in the organic semiconductor lasers.

本论文的研究结果表明，基于紫外光聚合反应的新型聚合物光栅可以实现较高的折射率调制幅度，和很低的表面起伏深度，相比其它有机DFB光栅的制作方法具有明显的优势，因此在有机半导体激光器的制作中具有很好的应用前景。

Experimental results show that the refractive index modulation can reach about 0.010; and the depth of surface relief is low to about 0.7~12.4nm, which will be lower than 1nm in the gratings with 200~400nm period(according to the first-order and second-order DFB grating period of organic semiconductor lasers).

实验结果表明，折射率调制幅度较高，可以达到0.010左右；表面起伏很低，约0.7~12.4nm，在周期为200~400nm(对应于有机半导体激光器的一级和二级DFB光栅周期)的聚合物光栅中，表面起伏深度小于1nm。

In the past, the high frequency resonance technique is usually applied in the envelope detection for a vibration signal with amplitude modulation. When applying the Hilbert transform in the high frequency resonance technique for the envelope detection of vibration signals, the computing burden is very high. On the other hand, when applying the linear least squares analysis method, the computing burden is lower. When applying the envelope detection in the lowest vibration mode, an accelerometer with the low-pass filtering cutoff frequency at 4kHz should be choose.

在过去的研究方法中，振动讯号之振幅调变通常以高频解调分析法应用於包络讯号侦测，而高频解调方法应用希尔伯特转换的包络分析，所需要的计算量是非常的高，若以线性最小平方分析法应用於高频解调分析法中，则所需要的计算量较小，如果以最低模态来估测包络讯号时，可以适当的选取加速规来代替低通滤波器，而加速规的截止频带必须在4kHz左右。

At the beginning of this paper a quantity standard of luminance uniformity based on visual modulation threshold function is proposed.

对于亮度不均匀的问题，目前基本上是从改进器件结构和制造工艺两方面来着手解决的。

This modulation was found to alter the localization of lymphocytes and dendritic cells within responding lymphoid tissues.

这种调节改变了响应的淋巴组织中淋巴细胞和树突状细胞的位置。

To overcome these drawbacks, the application of current mode tri-state modulation technology to the switching power amplifier for magnetic bearings is proposed, as well as its special advantages.

文中首先分析了电流纹波对磁轴承系统的影响，接着分析了电流两态调制技术本身的固有不足及电流三态调制技术在磁轴承开关功放应用中的优势。

Power electronics ; Switching power amplifier ; Magnetic bearing ; Current mode tri-state modulation

电力电子；开关功率放大器；磁轴承；电流三态调制

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。