控制元件

In the design of the power supply, the main circuit topology frame uses full-bridge series resonant switching and parallel load connection, in which, four MOSFETs are adopted as the power switches, and by four pulses which UC3879 produces, high frequency operation and fast response are realized. In addition, the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition, thus the disturbance to the power system is avoided. Especially,by the use of high frequency transformer, PQ50/50, the switching power system can provide the steady discharge current without any amperite.

此开关电源采用全桥软开关技术、串联谐振并联输出，四个MOSFET管为主控制开关元件，通过脉冲产生电路UC3879产生的四路相关脉冲实现了高频交替开关，同时能快速响应输出的各种变化；避免了开关管的硬开关，提高了转换效率，另外通过采用高频变压器PQ50/50隔离了原副边，减小了高次谐波对电网干扰；无需镇流电阻也可实现气体稳定放电。

This thesis DESign steel wire tension control system of Steel Billet Grinding Machine, and establish mathematical model of every component in electro-hydraulic proportional valve control dissymmetry hydraulic cylinder servosystem and the load with large inertia and flexibility system of Grinding Machine. Through the medium of matlab/simulink simulation, this thesis mostly analyses Pre-load impact of steel wire stress. Compare with the emulation result of non-feedback, force feedback, displacement feedback, thereby educe reliable conclusion.

本文设计了钢坯修磨机钢丝绳张力控制系统，并且对电液比例阀控非对称液压缸伺服系统的所有液压元件和修磨机柔性负载系统进行了建模，通过MATLAB／SIMULINK仿真，主要分析了预紧力对钢丝绳受力的影响，而且对开环无反馈、力环反馈、位移反馈的仿真结果进行了比较、得出了可靠的结论。

In this paper, a new design of the triggercircuits of the Silicon Controlled Rectifier is Presented.

一、概述可控硅是大功率电能转换与控制领域中的常用元件之一。

Genetec of Saint-Laurent, Quebec, Canada, has released the latest version of its IP access control solution. Synergis now includes a software development kit for third-party system integrations, such as human resource management, time and attendance, and fire and intrusion detection.

加拿大魁北克州的Genetec公司，发布了最新款的IP 出入口控制系统Synergis，内置了软件拓展元件，有利于第三方系统（包括人力资源管理系统、计时考勤系统、火警以及入侵监控系统等等）的有效兼容。

In this thesis, Sallow junction formation and low thermal budget control are important for advanced device manufacturing.

在本论文中，对於先进元件的制造上，浅接面的形成和热预算的控制是很重要的。

Because the electric products trend to become lighter, thinner, smaller and multi-functional, semiconductor industry has to focus on IC chip scale-down. Meanwhile, IC packaging technology must also become more advanced to be compatible with this trend. Wires weep is one of the important issues in packaging technology.

现今电子产品多以朝向轻、薄、短、小与多功能趋势发展，使得IC元件薄小化成为必要的发展技术，除了IC制程技术突破，提供晶片保护并作为讯号传输媒介的IC封装技术也必须随之跟进，对於金线偏移的预测与控制便是一例。

In the feedback regulation system of choles-terol metabolism, SCAP together with membrane-bound transcription factors - sterol regulatory element-binding proteins control transcription of the genes encoding enzymes of choles-terol and fatty acid biosynthesis.

在胆固醇代谢的反馈调节系统中，SCAP与膜结合转录因子胆固醇调节元件结合蛋白(sterol regulatory element binding proteins；SREBPs)等调节因子，共同控制一系列酶编码基因的转录过程，包括胆固醇和脂肪酸生物合成过程中所需的酶。

According to the characteristic of 3-D loom in existence, leading-yarn needle and crochet hook is designed in the selvedge apparatus to realize the selvedge by using the knitting method. They are all driven by high pressure air cylinders with different models, which are chosen based on the demand of various moving parts. The apparatus element is controlled by electromagnetic valve, so it can syncretize very well with the loom.

根据现有织机机构特点，边部机构中设计了引纱针与钩边针配合运动来实现针织锁边，这两部分装置都采用气动驱动，气缸型号根据机构的要求和条件选择，执行元件均由电磁阀控制，与织机整体很好地融合在一起。

In the most of labeling machines stepping motor or servomotor is used as actuator, and their construction and control are complicated.

但在大部分贴标机中使用步进电机或伺服电机作为驱动元件，其结构和控制复杂，制造成本高。

A snakelike robot is driven by a shape memory alloy spring combining with a ordinary steel wire spring.

利用形状记忆合金弹簧和普通钢丝弹簧联接作为动力驱动元件设计制作的一种蛇形机器人，其动作靠电流的通、断来控制。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了