PC机与MCS-51系列单片机多机通讯在语言学习系统中的应用

讨论了PC机与MCS－51单片机多机的通讯问题和接口技术，主要介绍了该方法在语言学习系统中的应用。     

用离散相似法仿真控制系统动态响应的研究

由于数字计算机引入控制系统，所以用计算机对实际系统进行仿真是一种有效的方法，其特点是周期短、费用成本低，对于实际系统具有指导意义，讨论的控制系统仿真方法是基于离散相似快速数字仿真方法，讨论了系统仿真的实现。     

分布式多路远程温度检测系统的设计与实现

本系统运用主从分布式和总线分布式多机通讯方式思想，设计了一种可大规模多点温度测量的巡回检测系统。利用RS-485进行串行通讯，通过PC机发出控制指示，对各单片机从机进行现场温度采集，由PC机进行数据处理和显示。系统检测温度范围为0℃～400℃，分辨率可达到0．01℃，并可由PC机统一设置系统时间和温度修正值和设置各从机的温度报警上下限，主机、从机均具有声光报警功能和数据更新与掉电保护功能、打印功能，人机界面友好。本系统具有巡检速度快，扩展性好、分辨率高等特点。     

微波自动测量综合实验系统研究

本文介绍了微波自动测量综合实验系统的主要功能，特点。该系统采用主从机结构，由单片机、PC机、双工作台、多功能测控软件包组成。主机采用PC机，从机采用基于80C196KB的单片机系统。主机和从机通过串行口传送数据，采用这种结构、测量系统不但结构紧凑，而且运行可靠，并且用VC6．0开发实验指导性软件，使之与现代实验教学相适应，取得了良好的教学效果。     

IBMPC系列微机与8051单片机的多机通信

介绍计算机多机通信方法，讨论该系统的组成、特点及在教学实验中的应用。     

基于集群下的并行计算

大规模科学计算的常用方法是并行计算，从性能和费用等方面考虑，优先选择的系统应是集群机-即将一群PC机用网络以某种结构互连起来，统一调度、协调处理以实现高效并行计算．本文介绍了相关并行计算软件，讨论了集群系统下的一些概念和需要解决的一些问题．     

用PC机控制炉温的控制实验系统

用PC机做控制器构成的计算机控制系统具有编程方便，便于改变控制算法等许多优点，但容易损坏PC机，为此我们对一些器件进行了改进，构成了炉温实验系统，本文主要介绍该系统的基本组成及工作原理。     

高速异步串行通讯接口程序设计

介绍计算机控制系统中PC机异步串行通讯接口程序设计的一种方法，可直接对8251A编程，以实现高速异步串行通讯，并提出了采用中断方式进行异步通讯的方法。     

基于RP技术的TSJ机快速成形工艺精度的浅析

TSJ机快速成形工艺精度受各种因素影响。为了满足社会客户的需求，需要研发高精度、高性能、自动化的桌面小型系统（概念模型机或台式机）。计算机集成实时误差反馈系统——全闭环控制系统的制造方法，即集成化控制可改善工艺精度．提高机床的性能。     

基于UDP协议的局域网监控系统的开发

本文首先介绍了UDP(User Datagram Protocol，用户报文协议)与TCP／IP协议的区别，并以一个局域网监控系统的开发为例，说明使用UDP协议进行网络编程的基本步骤。此监控系统的工作机制是当受控机运行一个程序，用于监听端口并接收指令，而主控机则通过向受控机发送指令，实现监控任务。     

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?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

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…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.