查询词典 modulation

A long period fiber grating is a band rejection fiber device with periodical retractive index modulation formed along the axis of the fiber core.

长周期光纤光栅是在光纤纤芯中沿轴向形成折射率周期性调制的带阻型光纤器件。

At first, this paper gives the brief introduction of the history and present status of accelerometer and its testing technology, the working principium and math model of the liquid floated pendu-lous accelerometer, and then, decides the binary width pulse force retrim loop as the design proposal of testing system, researches the transfer function of every part in the system emphasizly, analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system, and designed the correcting net, analyses the basal problems such as resolution, sampling restraint, precision and so on, designs the hardware testing circuits such as preamplification, band-pass filter, alternating amplifier, phase sensitive demodulatorn, pulse-width modulation, frequency scale circuit, moment current generator. Finally, using the graphics program language LabV-IEW which is designed for testing field especially by NI accomplishes the solfware design of testing system,realized the testing functions.

首先对加速度计及其测试技术的发展历史和现状，液浮摆式加速度计的工作原理和数学模型等作了简要的介绍，然后确定了以二元调宽脉冲再平衡测试回路为设计方案，并从控制理论的角度进行了分析，着重研究了系统中各部分的传递函数，利用系统开环传递函数分析了系统的稳定性，同时设计了系统的校正网络；分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题，并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路，验证了电路的正确性，最后按照测试系统的要求，采用了美国NI公司专为测试领域所开发的虚拟仪器工具——LabVIEW作为测试软件开发工具，利用该图形化编程语言完成了测试系统软件部分的设计，实现了测试功能。

After analyzing Tian and Alattar algorithm, a novel lossless information hiding method based on integer linear transform was proposed. The near character of pixels could be analyzed. After the less distorted revisable vector was transformed by integer linear transform, hidden information was embedded by pair-check modulation.

在分析Tian和Alattar隐藏算法的基础上，提出了一种基于改进整数线性变换的无损隐秘传输方法，通过分析可修改矢量区域象素的邻近相关性，选取出对图像质量影响较小的可修改矢量，进行整数线性变换后再嵌入信息。

The analysis of dynamic response of the modulation and the demodulation circuit s and the auxiliary car- rier wave amplifier have been considered more in details.

所用方法是差分方程求解法，因为用差分方程来描述具有机械振子的调制解调线路的固有工作过程，要比用相同的初始条件的微分方程来描述更为准确。

Two Rugate filters for compensating gain narrowing are designed separately based on the gain characteristics of Ti: sapphire amplifier and Nd: glass amplifier. The Gauss spectral shaping function is selected as the compensation modulation function.

采用Rugate膜系理论，分别根据钛宝石和钕玻璃介质增益窄化的特点，合理选择补偿增益窄化的调制函数，优化设计出了分别用于补偿钛宝石系统和钕玻璃系统增益窄化效应的Rugate滤波器。

On the basis of relation between the seism and solar activity, it is pointed out that the periodicity evolution of the seisimic activity is under the modulation of solar activity.

在太阳活动与地震相关研究的基础上指出：在周期性太阳活动的调控下，地震活动也显示出明显的周期性演化。

In order to learn the effect of the random perturbation on imaging quality of the camera during the motion,the process of the dynamic imaging of the camera is analyzed,and the modulation transfer function of the camera is obtained.Then,the influence of the random perturbation,which submits to normal distribution or changes sinusoidally,is studied respectively.

为了描述航天相机运动过程中随机扰动对成像质量的影响，通过分析相机动态成像过程，得到了存在扰动时相机的调制传递函数，并分别讨论了服从高斯分布和具有正弦规律变化的随机扰动对像质的影响。

A high resolution ranging method is described utilizing a novel modulated waveform, hereafter referred to as coherent burst modulation. The laser is sinusoidally modulated for a brief period of time and then is off for a much longer period of time.

在脉冲相位式激光测距中提出采用连续发射的正弦调制脉冲信号提高发射激光的峰值功率以提高测程，但发射激光的平均功率被保持很低保证了发射激光对人眼的安全。

Ji Shifen is used at fragile when sizy modulation, the Ji Shifen of 15% can be joined in paste.

吉士粉用于脆浆糊的调制时，可在糊中加入15%的吉士粉。

carcinoma is a somatopsychic disease, the modulation on emotion should be the focus in the therapy of the patients with carcinoma.

癌症是一种身心疾病，对癌症病人的治疗要重点关注其情绪活动的调节。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。