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In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.

本文在分析传统串级调速原理的基础上，对系统的功率因数进行分析；针对传统串级调速系统功率因数低的缺点，采用升压斩波式串级调速系统加以改进；建立了升压斩波式串级调速系统的等效电路并采用向量图法对该系统的功率因数进行详细分析；分析了系统的谐波情况；构建了以7.5kW／380V电机为调速对象的升压斩波式串级调速系统实验装置，给出相应的实验结果；针对斩波器中IGBT处于硬开关状态的缺点，应用无源无损软开关技术予以改善，包括对软开关电路工作原理的分析、参数的设计并给出相应的实验结果。

Aiming at T-base diamond lathe, author use both on-line and off-line to measure the error vector of lathe workspace, and acquire good network train samples, then build two-dimensional error compensation model of lathe workspace with BP neural network and fuzzy neural network, at last build contour error compensation control system.

在分析国内外数控机床伺服闭环系统的发展现状及局限性的基础上，利用原数控系统和所研制的二维压电陶瓷微动刀架，研制了独立于原数控系统的超精密闭环控制系统。

Aiming at the dynamic performance of frequency tracker designed specifically for laser Doppler velocimeter, the analysis was accomplished and some results of the experiments are presented.

针对激光多普勒测速仪常用信号处理设备———频率跟踪器，采用实验方法分析了其动态响应特性及影响因素，发现其动态响应参数并不能全面反映其在实际测试中的动态响应能力，实际测试中的动态响应能力明显低于通常的估计。

The hardware system comprises a football locating emitter, a site corner orientation emitter, a vidicon, a radar velometer, a player locating emitter and a site vibration receptor. The software system comprises a plenty of computer program software developed for aiming at the hardware.

其中硬件系统由足球定位发射器、场地边角定向发射器、摄像机、雷达测速器、球员定位发射器及场上裁判振动接收器等组成；软件系统则由针对以上所述硬件进行开发的各种电脑程序软件等构件组成。

The horizontal angles and vertical angles were measured by aiming at target outline, by which the horizontal displacement and inclination ratios were calculated. Measurement precision of the method was analysed by the least square principle.

利用非接触的方法切准待测目标的外轮廓，测量其水平方向角和竖直角，依据测角度推算水平偏移量和倾斜率，并根据最小二乘原理分析了其测量精度。

It is very important to calculate and analyze the differential settlement of MSW correctly in order to ensure the success of vertical expansion of existing landfill.Aiming to the MSW differential settlemen...

研究了竖向扩建时垃圾不均匀沉降，并介绍了不均匀沉降的计算方法，结合工程实例对老填埋场竖向扩建时垃圾不均匀沉降影响进行了分析，从工程技术角度提出了相应的解决方案。

Aiming at the development history and trend of video monitor system,the realization of network video monitor system was studied.

针对视频监控系统的发展历程和发展趋势，研究了网络型视频监控系统的实现途径。

Aiming at the features of the mute circuit of PVW2000 series video-recorder with power on, illustrates their general principles, offers the inner circuit to the power on pulse generator M51957BL, the parameters for the main parts and the reference voltage for every key points in different conditions.

针对PVW 2 0 0 0系列录像机中开机静音电路的特点，对其基本原理进行了详细的分析，给出了电源检测元件M5 195 7BL的内部电路、各主要元件的参数以及不同状态下电路中各关键点的参考电压，指出了系统内不同单元开机静音电路的差异及电路故障的排除方法。

Aiming at these shortages, this paper research the key technology of Identity Authentication based on voiceprint feature.

本文以上述三个方面为研究对象，详细研究基于声纹特征的身份认证系统中的关键技术并实现了一个系统原型。

Aiming at realizing monitoring of tyre capsule vulcanizer operating process, a masterslave control system was composed of configuration software and Mitsubishi FX2N series PLC. PLC was taken as lower machine to operating process of tyre capsule vulcanizer. Configuration software monitored the running state of tyre capsule vulcanizer realtimely, showed data in real time and recorded data in upper machine.

为实现对轮胎胶囊硫化机的工作过程的控制，采用组态软件和三菱FX2N系列PLC组成上、下位机系统，PLC作为下位机对轮胎胶囊硫化机的工作顺序实现控制，利用组态软件对胶囊硫化机的工作状态实行实时监控，实现数据动态显示、存储、报表等功能。

What was it that made you want to change sider ?

是什么使你临阵倒戈？

I don't know what he wants, but let's play along with him.

我不知道他要干什么，可我