查询词典 power frequency

The keystone of this device as follows : input three phase AC power supply of 380V±15%, become DC after primary full-bridge commutation wave filter, convert high frequency AC pulse of over 20KHZ using IGBT inverter module, become DC power supply for the usage of producing ozone after step-up of High Frequency Transformer and commutation of quickness rectifier tube and reactor.

高频高压臭氧发生装置的基本原理是：输入380V±15%三相交流电源，经初级全桥整流滤波成为直流，通过IGBT逆变部件，转换成20KHZ以上的高频交流脉冲，再经高频变压器升压，最后由快速整流管、电抗器整定为可供发生臭氧用的直流电源。

The dissertation has researched on ultra-high frequency induction heating power supply and analyzed several classical topologies, which are commonly used in the ultra-high frequency power supply.

本论文以超高频感应加热电源为研究对象，对目前几种常用的经典电路拓扑结构作历史性回顾和分析。

On the other hand, with the purpose of fuzzy feature extraction and fuzzy classification device design, the undulatory property of maximum and minimum scattering power corresponding respectively to the maximum and minimum eigen-polarization has been investigated in frequency domain. Furthermore, the anisotropy polarization degree of target, which is determined by both maximum and minimum scattering power of target, has been studied; meanwhile, the dynamic changing characteristic of eigen-polarization on Poincare polarization sphere has been investigated by means of the conception of polarization frequency stability, the research result shows that PSD value has a big jump near π, forming a sharp pulse, and different target has their individual distribution property of PSD pulse.

另外，围绕目标模糊特征提取及模糊分类器的设计，研究了目标最大、最小本征极化所对应的目标最大、最小散射能量随观测频率的起伏特性，考察了由目标最大、最小散射能量共同决定的目标的各向异性极化程度；同时，采用极化频率稳定度的概念，研究了本征极化在Poincare极化球面上的动态变化特性，在最大、最小散射能量相等的频率点上，PSD曲线呈现为幅度接近π值的尖锐脉冲，反映了目标极化散射结构对这一频率跳变极为敏感，但不同目标的这种PSD曲线特征又有很大的不同。

Using MATLAB, the changes of frequency and power in every area of the two-area and three-area combined systems were simulated respectively and the result shows that the revised ACE controls the changes of frequency and power better than the unrevised one.

利用MATLAB分别对双区域和三区域联合系统中的每个区域中的频率变化和功率变化进行仿真，结果表明，采用修正后的区域控制误差控制下的频率变化和功率变化要比未修正的控制性能好。

Cavitation is the most distinct characteristic of the high-power low-frequency ultrasonic fields, and it is also regarded as the primary mechanism of ultrasonic cleaning. Nevertheless, the measurement question of the high-power low-frequency ultrasonic fields hasn't been resolved well, because of the incomplete cavitation theory and the complexity of cavitation fields. The universal acceptant standard measurement hasn't been found up to the present so that it is difficult to judge of the performance of ultrasonic cleaning machines scientifically.

大功率低频超声场最鲜明的特点就是空化，而空化也被认为是超声清洗的主要物理机制，但由于其理论研究尚不完善，加之空化声场的复杂性，使得至今大功率低频超声场的测量未得到很好的解决，尚未找到一种与清洗效果有确定关系的普遍适用的标准方法，使得在客观地评判清洗机优劣时很困难。

In the incontinuous cutting, the wave shape of milling can be looked as periodic function. When the milling wave shape with single-tooth was looked as impulse function, by the Fourier Transform, we can find out that it is composed of sine wave with a given frequency and a series of integer multiple frequency. Discussing on the power function is a major tache for studying on the cutting capability of the complex three-dimension groove milling inserts, so to know the facts that affect the single-tooth milling spectral value, and to observe the dynamic milling wave property from the composition of the power spectral, thus we can design and optimize grooves.

在断续切削中，铣削波形可被看作周期函数，将单齿铣削波形看成为脉冲函数，经过傅立叶变换，可以表示为一个按特定的基本频率变动的正弦波形的分量和许多个按基本频率的整数倍而变动的正弦波形的分量叠加而成，讨论所获得的频谱函数，是研究三维复杂槽型铣刀片切削性能的主要环节，以便了解影响单齿铣削波形幅值谱图的各种因素，并从功率谱图的组成情况来考察动态铣削波形的特性，从而进行槽型的设计和优选。

As a result of the frequency conversion electrical machinery particularity, uses the junction to hand over the frequency changer power supply the electrical power system, caused the electric current and the voltage waveform has the distortion, the profile turned the nonsine wave by the original sine wave.

由于变频电机的特殊性，采用交交变频器供电的电源系统，使得电流和电压波形发生了畸变，波形由原来的正弦波变成非正弦波。

Based on the laser longitudinal mode splitting theory, a novel scheme of dual-frequency laser with large frequency-difference is presented using electrically controlled birefringence of liquid crystal, and the transmitted resonant mode splitting by birefringent of Fabry-Perot etalon has been analyzed theoretically. A new element of liquid crystal Fabry-Perot etalon is designed and fabricated, which serves as aselector and splitter of both laser longitudinal modes and Fabry-Perot etalons transmitted resonant modes. Two different experimental systems of laser-diode end-pumped Nd:YAG laser have been set up using two different LDs, and the transmission of liquid-crystal cell have been measured. When the empty LCFP is inserted in the cavity of high-power LD pumped Nd:YAG laser, the oscillation of a single laser longitudinal mode have been observed, such a result shows that the designed and fabricated LCFP element is capable of selecting single axial mode. While an anti-reflected liquid crystal cell is inserted in the cavity of Nd:YAG laser end-pumped by the high-power LD, it is difficult to confirm weather the laser longitudinal modes have been spitted or not. The subject is summarized in this thesis and the improvement of the project has been presented.

论文以激光纵模的分裂理论为基础，提出了可望获得几十GHz甚至上百GHz的液晶电控双折射双频Nd：YAG激光器的总体方案，并对用双折射效应分裂F-P标准具透射谐振模进行了理论分析；设计并加工了一种集激光纵模选择、激光纵模分裂和F-P标准具谐振透射模分裂于一体的多功能元件——液晶电控双折射F-P标准具；建立了两种不同功率激光二极管端面泵浦的Nd：YAG激光实验系统，并对液晶盒的透射性质进行了测试；将未灌注液晶的空液晶F-P摘要标准具插入大功率LD泵浦Nd：、叭G激光谐振腔内，观察到了单纵模激光输出，说明所设计和加工的液晶F一P标准具具有纵模选择能力；将镀有增透膜的液晶盒插入大功率LD泵浦Nd八7AG激光谐振腔内，是否产生了激光纵模分裂现象还难以确定。

A high-frequency electronic therapeutic instrument for stomatopathy is composed of power supply, high-frequency oscillator and therapeutic mode controller and technically features use of two independent stabilized power supplies, stepless regulation, and switch signal generator to control output interval and therapeutic mode switching.

本发明涉及的是一种用于口腔科的高频电子治疗仪，它是由电源电路、高频振荡电路和治疗方式控制电路组成，其技术特点是采用独立的两路稳压电源供电，并实现无级可调，设置开关信号发生电路控制治疗输出的时间间隔和进行治疗方式的转换。

In this text,according to home and abroad scholars's study on design of sonochemical reactor and parameters of ultrasound cavitation, I designed the sonochemical reactor cohered with transducers on its side wall, and study cavitation field and ultrasound field distribution by changing power and frequency ,and made research in absorption of different power and frequency ultrasound traveling in water, and especialy study the cavitation with different sound intensity.

笔者综合国内外学者关于声化学反应器的设计思路，设计了侧壁黏结换能器清洗槽式声化学反应器，改变频率定性测量反应器中的声场和空化场分布，研究不同频率的超声在水中传播的吸收情况、声空化和声压或声强的关系以及一定频率的超声在水中的有效空化范围。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。