基于Atmega16单片机的重物提升控制系统设计——数据信息显示

为了实现对重物提升的精确控制,设计中选择了以Atmega16单片机为核心的控制系统.根据控制系统对人机界面的要求,待机状态时,需要显示屏能够显示有关参数的设定量;设备运行中,要求显示屏能够实时显示重物提升的位移量.就有关数据信息显示从硬件电路和软件程序两个方面进行了详细介绍.     

电子速度控制器在梳棉机清花机上的应用

梳棉机清花机ＳＫ—Ⅰ电子速度控制器采用霍尔磁电传感器和自动检测技术以及集成电路设计制造，是超小型高科技机电一体化仪器．性能达到同类进口产品技术水平，可代替进口设备．该仪器控制精度高．造价低，是性能优良的速度测控设备．有效地保护梳棉机清花机以及化纤等机电设备．具有很好的经济效益。     

全液压铣刨机铣刨系统速度刚度问题研究

为提高全液压铣刨机铣刨鼓切削速度稳定性,采用理论分析与试验相结合的方法,对影响铣刨鼓切削速度稳定性的因素及提高铣刨鼓切削速度稳定性的方法进行了研究.指出铣刨液压系统的速度刚度是影响铣刨鼓切削速度稳定性的重要因素,采用高性能元件、加大液压马达排量和合理配置液压元件的工作点是提高液压系统速度刚度的重要措施,其中液压系统的速度刚度与液压马达排量的平方呈正比关系.     

Improved shape evolution of copper interconnects prepared by jet-stream etching

In the preparation of copper interconnects in the conductor pattern of a printed circuit board (PCB), wet etching processes are commonly adopted for creating patterns of high-density interconnects. Currently available techniques of immersion and spray etching could lead to poorly shaped wires due to complex flow fields or the disturbing puddling effect. A modified technique of arrayed jet-stream etching was developed in this work, aiming at producing well-defined copper interconnects on a PCB in a significantly shorter time. The results were appealing in that copper interconnects of 35/140 μm (thickness/width) exhibiting etching factors of greater than 6 were obtained in 20 s, much better than the conventional ones with etching factors of 3 to 5 and etching times of at least 2 min. In addition, uniformly etched copper interconnects with less than 20 μm undercuts were observed on one etching line. One additional point to note is that no banking agents or inhibitors as commonly seen in conventional etching techniques were needed in this new processing method.     

再生新闻纸厂结垢物质的分析

废纸的回用在造纸工业中已占相当大的比例。然而在白水封闭使用的情况下,就会在制浆或造纸设备上产生结垢物,严重影响生产的正常进行。本文根据从西安精美纸业公司制浆系统圆网洗浆机上采集的结垢物试样的分析,明确结垢物的主要成分和结垢的条件,希望对实际生产有所帮助。     

基于89C52单片机的电阻测试系统研究

针对传统的电阻测试系统存在的多种问题,研制了一种基于89C52单片机的电阻测试系统.该系统以单片机为控制核心,结合555电路构成的多谐振荡电路,利用汇编语言进行编程.使测试系统具有测量精度高、性能可靠、智能化及自动化程度高等优点,弥补了传统测量方法的不足.     

浅论电磁兼容的设计准则

介绍了电磁兼容对于电子产品的危害,为避免这些危害在电子产品使用过程中出现,在产品设计中应遵循的一些准则.     

基于网络的电路原理实验系统

介绍了基于Internet的电路原理实验系统,它综合运用了网络、电路设计、面向对象编程及数据库等技术,将真实的物理设备与网络相结合,为局域网和Internet用户提供了一个开放的实验平台,使用户可以通过远程登录的方式进行电路原理实验。该实验平台时改进远程教学有很大的意义。     

新混沌系统分析及其同步控制

提出了一个新混沌系统,通过Matlab对该系统进行了分岔图、Lyapunov指数、相图等仿真分析,证实了在选定特定参数下,该系统为混沌系统。随着参数的改变,该系统会出现周期–倍周期–混沌–周期–倍周期–混沌交替现象,具有较复杂的动力学特性及对初值的敏感性,通过Multisim电路仿真证实了该系统的物理可实现性。针对提出的新混沌系统,设计了错位投影同步控制器,从理论上证实了在同步控制器的作用下该系统与Chen混沌系统达到了同步,通过Matlab仿真证实了同步控制器的有效性。最后,在同步控制器作用下实现了新混沌系统和Chen混沌系统的数字加密传输。     

Enhanced Particle Removal in Fluorinated Liquids—An Application in Nuclear Decontamination

An experimental cleaning system has been developed to demonstrate the decontamination of model electronic circuit boards by this cleaning process. The media used in this process are a wash solution of a high molecular weight fluorocarbon surfactant in a perfluorinated carrier liquid which results in enhanced particle removal, followed by a perfluorinated carrier liquid rinse. The perfluorinated liquids of interest, which are recycled in the process, are inert, nonflammable, generally safe to use, and do not present a hazard to the atmospheric ozone layer. The cleaning experiments were performed at the MIT Nuclear Reactor Laboratory. The radioactive particles removed from the circuit boards were captured by 0.22 μm filters with a filtration efficiency of 99.5% per stage. Compatibility tests were performed on these model electronic circuit boards. The results obtained show that neither the process fluids used nor the maximum level of the ultrasonic agitation applied harmed the circuit boards or the circuit components. All the circuit boards used in these tests were still functional after the cleaning experiments. A three log reduction in contamination was obtained in 1 hour. These data indicate that this process, once implemented on a large scale, will offer users in the nuclear industry a practical and cost effective means of decontaminating and recovering a wide variety of tools and instruments.