铁炭微电解法在单晶硅生产废水处理中的应用

介绍了某单晶硅生产改扩建各工序产生废水的水量、水质，并对原废水处理站存在的问题进行分析。在原废水处理站的基础上，采用生铁屑和焦炭组成微电解氧化还原塔作为单晶硅生产废水处理的预处理，取得较好的效果．     

微型打印机在单片机系统中的应用

微型打印机是各种智能化仪表、仪器及各种单片机系统的重要输出设备。本文介绍应用89C51单片机控制微型打印机实现打印功能的设计和实现方法,并给出89C51单片机控制微型打印机的硬件设计及其C语言软件的实现。     

病床呼叫及输液监控系统

为了提高医院服务系统的智能化水平,设计了一种总线互联的病床呼叫及输液监控系统。系统由一个主站和多个从站组成．主站可以接收从站送出的呼叫信号,并存储20个呼叫的病床号,具有手动清除当前显示的病床号及声光报警信号的功能。在从站上能实时显示点滴速度,在输液结束3秒内发出声光报警信号,并提示主站进行处理。主站和从站问最远距离可以达到1000米以上,同时主站能巡回显示从站的编号和当前的点滴速度,显示间隔时间可以在3～10秒间任意设定。     

积木式MCS-51系列单片机实验设备设计

文章介绍一种MCS-51系列MCU实验设备的设计方案．该方案包含10多种功能模板．在各模板内部的主要元器件之间设有接点，连接这些接点可以选择模板功能；模板之间则设有接线端子，连接这些端子可以实现不同的实验功能．模板内部器件和各模板之间的连接可以像做积木游戏一样组合．该方案克服了现有MCU实验设备因硬件固定而存在的缺陷，更利于学生动手能力和创新能力的培养．     

The functional meanings of behaviors: A factor analytic study of motivational orientations in Virgin Islands students

One hundred and sixty-five high school students in the Virgin Islands were asked to rate the extent to which they associate each of 62 behaviors with their concepts of “success,” “joy,” and “satisfying expectations.” They were also asked to rate the frequency with which they performed each of the behaviors. Results indicated that Virgin Islands students associate the word “success” not with academic behaviors, but with being modern, attractive, and nurturing. Moreover, individual students are less apt to perform those behaviors which Western teachers believe lead to academic success and more apt to perform those behaviors which the sample as a whole associates with being successful. The data indicate that although many Virgin Islands students enjoy traditional island activities, they do not feel successful when they engage in them. The results of the investigation are interpreted within the context of what is known concerning achievement behaviors of middle-class American youth, and implications are drawn for the teaching of young persons from diverse cultural backgrounds who attend classes conducted in the Western mode.     

实现Authorware与MCS-51系列单片机的多机通讯

通过实例详细介绍了Authorware与单片机进行多机通讯的原理和方法，既有硬件原理图，又有程序清单，具有一定的实用价值．     

AT89C51单片机在霓虹灯控制中的应用

霓虹灯控制器由于应用广,故追求较高的性价比。由AT89C51单片机结合双向晶闸管输出型的光电耦合器MOC3021来实现的控制器功能,时间常数易修改,使用灵活,电路易实现,成本低,控制芯片更换方便。     

Teachers’ unions and compensation: The impact of collective bargaining on salary schedules and performance pay schemes

This study examines the impact that collective bargaining has on multiple dimensions of teacher compensation, including average and starting salaries, early and late returns to experience, returns to graduate degrees, and the incidence of different pay for performance schemes. Using data from the School and Staffing Survey (SASS) and a more recent data set, the Teacher Rules, Roles and Rights (TR3), we find that collective bargaining has a significant impact on all aspects of current, qualification-specific salary schedules. Further, we find some evidence that bargaining impacts the design of performance pay plans. Specifically, unions tend to encourage teacher bonuses that are based on additional qualifications or duties, but discourage bonuses that directly reward improved student test scores.     

基于单片机的公交车自动报站器的设计

本文介绍了设计使用AT89S51单片机作为控制核心的公交车自动报站器,通过控制ISD4004语音芯片的语音录放和LED显示汉字的功能,实现了公交车自动报站器的语音报站和汉字显示功能。介绍了语音报站部分、汉字显示部分、键盘控制部分的硬件电路图和软件程序的编写,并对最小系统的软硬件做了简单介绍。     

门禁管理系统中的读卡器的设计

设计了一种基于射频识别技术的联机型非接触式IC卡门禁控制系统,提出了整个系统的实行方案。系统采用分布式结构和集中控制方案,由三部分组成：中心服务器PC、管理站LCD、门禁读卡器。与传统的门禁系统相比,具有显著的优越性。重点阐述了以MCS-51单片机为核心、YHY502系列为射频基站的门禁读卡器工作原理及硬件和软件设计。实际应用结果表明,系统运行稳定、实时性好、方案可行。