高频率的

When the linear array CCD is installed reasonably in autocollimator and peculiar pattern reticule is used autocollimator can measure two-dimensional small angle also with characteristics of great reducing cost simple driving and processing circuit high collecting speed and high frequency response measuring angle.

当线阵CCD安装在自相当奇特的格局和镜头可以用来衡量自二维小角度也有很大的特点，降低成本，加工简单驱动电路速度高、高频率采集反应测量角度。

A basic theory for constructing cavity resonator with a kind of slowwave transmission lines is presented, the procedure of determining sizes of cavity for a designed resonant frequency is proposed.

分析了盘荷同轴型谐振腔的TM慢波模式，并给出TM主模特征值和谐振频率的计算方程，证明了单一的TM高次模不能作为慢波模式单独存在于这种谐振腔之中，必须由多个高次模共同组成一个谐振模式。

In the aspect of Opto—electrical signal processing, because the heterodyne interference signal is a high frequency fringe signal, how to measure the phases change of this signal——including the integer part of phases change over 2π and decimal part of phases change within 2π, is a difficult problem in electrical circuit technique.

一方面，该电路能同时测量出相位改变量的2π整数部分和2π以内的小数部分，从而实现了大量程和高精度的统一；另一方面，由于该电路是模拟电路，其最高工作频率可以远大于由数字集成电路组成的条纹计数电路，故在实际应用中，其工作频率的设计范围能够适应较宽的外差干涉差频范围，这就为高速激光外差干涉测量打下了基础。

The needle selector in a knitting machine is used to control needle selection.

在针织机的选针系统中，选针器是用来实施选针控制的元件，要求选针器具有高频率、高精度、低功耗等特点。

In this paper it is believed that the onset process is from the unorderly sound waves generated by heated gases, through ordering the sound waves, regenerator onset in a high natural frequency, followed by steady oscillation whose frequency is controlled by resonance tube.

本文认为热声热机的起振过程是从气体被加热产生杂乱的声波开始，经过声波的规则化先从回热器的高频率自激振荡振动，继而扩展到以谐振管内气体固有频率为主导的整个系统的稳态起振。

A design and implementation method of the high speed modulation system, which adopted the new techniques of the FPGA and DAC based communication system,is presented in this paper. The effect of the key techniques of this system, such as the high speed digital signal processing for modulation, high speed based-band signal conversion, wide-band modulation, carrier suppression, high frequency and high precision system clock generation, is analyzed, and the solutions and performance analysis is also given. Finally, a high speed modulation system for space applications is implemented, can be used for high speed data transmission with QPSK, 8PSK, QAM or other kinds of digital modulation.

本论文依据正交调制原理，采用基于FPGA和DAC的设计技术，提出了一种高速、灵活的调制系统的设计方法，重点分析了系统组成的调制编码映射、基带脉冲信号转换、信号滤波、调制、系统时钟产生等关键技术环节的影响，解决了高速调制信号处理、高速数据转换、宽带调制、载波抑制、高频率高精度系统时钟的产生等关键技术问题，完成了一种适用于空间应用的高传输速率、多进制数字调制方式和调制体制灵活的数据传输调制系统的设计与实现，可在硬件设计不变的情况下，实现QPSK、8PSK和16QAM等多种调制方式的高速数据传输，QPSK调制速率达到500Mbps。

Stiff and light, extremely efficient, JBL's new My-Ti tweeters deliver the high-frequency extension of titanium domes with the damping of composite diaphragms.

刚性和轻，效率非常高，聆听新的我国钛高音提供高频率延伸钛穹顶与阻尼的复合膜。

It is a unique, unique in the world to use today's high-tech energy transfer system, the resonance frequency of intelligent quantum energy field into a special high-tech alloys.

它是一项特有的，运用当今世界上独一无二的高科技能量传输系统，把具有智能共振频率的量子能量场注入到特制高科技合金中。

Best cost-benefit ratio in our all series loudspeakers and perfect performance: Pro protect circuits are built into the crossover network to guard the high-frequency and low-frequency transducer from damage.

最佳的成本效益比，在我们的所有系列扬声器和完美的表现：临保护电路都内置于交叉网络，以防范高频率和低频率变送器受到损坏。

Considering the design parameters of the BEPCⅡ, in the case of one cavity type being adopted, the thesis analyzes the RF performance of accelerating mode, the suppression of higher order modes , and the restriction caused by HOMs against beam current threshold.

结合BEPCⅡ的设计参数，论文对其中一种腔型在BEPCⅡ上使用时加速模式的微波性能、高次模的抑制效果以及高次模对储存流强阈值的限制等方面进行了分析，并在铝模型腔上测量了加铁氧体高次模抑制器前后，超导腔中各种谐振模式的有载品质因子及其频率的分布。

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