自动地

The main content of this dissertation includes: 1. Research on the theory of ultrasonic power supply, introduce its development process. On the basis of these, fix on the scheme of medical ultrasonic low-power supply. 2. According to the principle of modularized design, divide medical ultrasonic low-power supply into four parts. They are power amplify circuit, power control circuit, frequency automatic tracking circuit and matching circuit. Separately research on their theories and design their circuits and necessary programs, especially, effectively resolve the problem tracking the supersonic vibration system with a narrow syntony frequency bandwidth and a high swing. 3. The matching experiments gain good result, and prove that medical ultrasonic low-power supply is entirely up to the mustard on intellectualization, wide band of working frequency, steady output and high efficiency.

本文工作的主要内容包括： 1、研究了超声功率电源的原理，并回顾了它的发展过程，在此基础之上确定本文医用小功率超声电源的设计方案； 2、按照模块化的设计原则，将医用小功率超声电源的设计分解为功率放大电路、功率控制电路、频率自动跟踪电路和匹配电路等四个部分，分别研究了各部分的原理，在此基础之上进行了具体的电路设计和程序设计，尤其是有效地解决了对谐振频率带宽窄振幅高的超声振动系统的频率跟踪问题； 3、通过与超声振动系统的各项配合实验，取得了很好的实验结果，验证了医用小功率超声电源完全满足智能化、工作频带宽、输出功率稳定、输出效率高的设计要求。

I often take the initiative to learn.

我经常自动自觉地学习。

Is the software and service subsidiary of Thales Group (Fortune 500) in China.

公司发展重点在交通运输，银行付款系统，及安全系统的软件开发和系统集成。2000 年开始，公司在中国广州，北京，南京，香港等地开展项目，涵盖自动收费系统，监控系统以及轨道/地铁信号系统等领域。

A broad inderstanding of basic technical theory in energy and power ergineering, including mechanics, thermology, electrical engineering and electronics

系统地掌握本专业必需的技术基础理论，主要包括力学、热学、电工与电子、自动控制及能源动力工程基础理论等

And what we do Computer lab fire prevention burglary-resisting system to answer require but make this, computer lab fire prevention burglary-resisting system adopt the infrared sensor, Temperature sensor, gas detector have lens , spend system able to programmer simulation circuit and picture transmit and implement and control 2 4 hours to computer lab correctly with subminiature device, Find unusual situation auto alarm , play a firing prevention and guard against theft role really , can make computer system relatively safe in one, In the reliable environment, operate steadily for a long time, and lengthen service life to the best of one's ability.

而我们讨论的机房安全措施正是应此要求而做的，机房安全措施统通过红外传感器，温度传感器，气体探测器还有摄像头，利用系统可编程模拟电路ispPC20以及用CCD超小型器件对图像传输对机房实施二四小时监控，发现异常情况自动报警，真正起到安全防范的作用，能够使计算机系统在一个相对安全，可靠的环境里，长时间稳定地运转，并尽可能延长使用寿命。

Kinds and selecting principle of phase shifter of the key devices in television receiving system of autotrackinging synchronous telecommunication satellite are analyzed. Transcendental equation of the propagation constant of latching ferrite phase shifter is derived, its properties are discussed.

分析了自动跟踪同步通信卫星电视接收系统中的关键元件移相器的分类及选取原则，推导了锁式铁氧体移相器传播常数的超越方程，并对它进行了详细地讨论。

This system is not only able to measure the temperature and humidity in storehouses of tobacco fermentation, storage for foodstuff and ammunition, brewage, and greenhouses conveniently, but also able to warn the transfinite temperature and humidity, to print at any time, etc. In addition, the sensor can be sent to the closed boxed-type center, and successfully achieve the auto-supervision of interior temperature and humidity of store goods.

系统能够方便地监测烟草发酵、粮食储备、弹药仓储、酒类酿制等库房内及温室蔬菜大棚的多点温湿度，并进行温湿度超限预警、随机打印等；尤其是配以专门设计的机械置入机构后，可以将传感器送到封闭的箱包式包装的烟包或粮包的中心，实现仓储品内部温湿度的自动监测，这是目前其它测量系统无法比拟的功能。

In order to detect load in tumbling box correctly,the frequency band that could reflect information of mill ball load was obtained from the vibration signal collected from ball mill bearing block.The signal was analyzed by energy method based on wavelet transform,from which the frequency band signal was picked out to show the corresponding coal level in tumbling box.

为了更准确地检测料位，对球磨机轴承座振动加速度信号进行采集，从振动信号中提取了反映料位信息的特征频段，利用小波分析技术对信号进行了能量分析，分离出反映滚筒内存煤量信息的信号，为实现球磨机料位的自动控制提供了理论依据。

The technology of Relay control, computer control andcommunication control are integrated to PLC and it is designed to industrialcontrol. Since PLC has many advantages such as good usableness, goodpracticability, complete hardware, easy to program, etc, it has already usedwidely in all kinds of automation control.

它将传统的继电器控制技术、计算机技术和通讯技术融为一体，专门为工业控制而设计，因其具有通用性好、实用性强、硬件配套齐全、编程方法简单易学等优点，而被广泛地应用于各种工业自动控制中。

Variational inequality problem is one of the most important optimization problems, it arises in a widely fields of signal processing, system identification, filter design, robot control, economic science, transprotation science, operational research, and nonlinear analysis fields.

变分不等式问题是一类重要的优化问题，它广泛地出现在信号和图像处理、系统识别、滤波设计、自动控制、经济科学、运输科学、运筹学，非线性分析等领域。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。