虚拟小信号高速采集＆数据累加器系统设计

虚拟小信号高速采集＆数据累加器是分布式光纤传感器系统中的重要数据采集处理设备．其硬件电路主要由模拟前置电路与AD转换电路、可编程逻辑控制电路、计算机接口电路三部分组成．文中给出了部分关键程序代码。并给出了使用虚拟小信号高速采集＆数据累加器的分布式光纤传感器系统的测温系统的8Km温度数据曲线．     

电感器件绕线张力测控系统研究

本文叙述了用应变式张力传感器做敏感元件的张力闭环测控系统的设计思想,给出了张力传感器的设计、驱动电路、比较放大电路的设计及系统调试方法。     

铅淬火炉温度智能测控系统的开发

为了实现铅淬火炉温度的精确控制,开发了温度智能测控系统.阐述了系统的硬件设计和软件实现,硬件包括温度传感器调理电路、数据采集电路、温度控制电路、单片机系统和串行通讯电路,软件是利用LabVIEW进行上位机的串行通讯、PID程序和人机界面的设计.最后分析了该温度智能闭环测控系统的动态精度,并给出实验结果进行验证,其控制精度可达到±1℃以内.     

基于C8051F的CMOS-LED器件参数测试仪

以C8051F060单片机为核心设计了CMOS-LED器件参数测试仪,分析了测试仪硬件系统的总体结构、逻辑功能测试电路、电参数测量电路和测量接口电路的硬件实现,给出了单片机程序的设计思路.     

三相永磁电机变频调速控制系统的设计

设计了一种基于LM3S615微控制器的开环变频调速系统。论述了变频调速系统软硬件的设计方案,对整个系统的主回路、驱动电路、保护电路、控制电路及软件系统进行了系统的阐述。主电路部分给出了整流、滤波、逆变器、开关管驱动电路等外围器件的参数计算。控制电路以LM3S615实现SPWM信号的输出。设计时基于对系统安全性的考虑,加入了系统的保护电路。该交流小功率变频器不仅具有功耗低、成本低的特点,而且具有结构简单、运行可靠等优点。     

AT89C2051单片机在温度测试系统中的应用

给出了由AT89C2051单片机控制的智能热电偶温度测试系统,叙述了该系统的温度测试电路、模数转换电路以及温度显示的软硬件实现方法。论述了模拟信号的采集、转换、处理和显示技术。     

变电站数据采集装置的设计

变电站综合自动化系统中,数据采集是监控系统的中心环节,所以在变电站综合自动化系统中起着重要的作用。详细分析了变电站数据采集系统,给出了系统的总体设计方案。完成了电路的硬件设计,给出了软件流程图。     

分数阶RL_βC_α带阻滤波电路特性研究

以无源RLC带阻滤波电路为研究对象,建立分数阶新带阻滤波电路模型,研究带阻滤波电路在分数阶域下特性与规律。给出分数阶RLβCα带阻滤波电路阻抗表达式,研究分数阶阶次α、β等系统参数对分数阶滤波电路影响规律,并给出阻抗灵敏度对比分析。此外,分数阶RLβCα带阻滤波电路作为一个重要滤波电路模型,系统分析分数阶阶次α、β等系统参数对截止频率、谐振频率、带宽、品质因数等幅频特性与相频特性影响规律。结果表明,分数阶带阻滤波电路展现出新颖电路特性与优异滤波性能。     

VC6.0下的离心泵性能测试系统的程序开发

介绍了该离心泵性能测试系统的测试原理及测试过程,给出了该系统硬件电路的方案设计,将计算机硬件接口电路与数字电路相结合。以实现离心泵性能检测控制的目的．系统的软件设计包括3部分:数据采集程序, 数据处理程序,绘性能曲线并实现打印、打印预览程序．     

模拟电路智能故障诊断系统的设计

分析了智能故障诊断技术的特点,利用模糊理论、小波分析、神经网络和专家系统等诊断方法．设计了模拟电路智能故障诊断系统,给出了系统的组成模块及其功能,利用不同诊断推理法的互补性进行诊断系统的引擎设计,并探讨了构建系统平台的原则。该系统已在有关模拟电路的故障诊断中应用,并取得了预期效果。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.