单片机控制的液晶显示器应用

文章介绍了一种基于AT89C52单片机控制液晶屏的设计方法,介绍了单片机对图形点阵型液晶显示模块控制的硬件接口电路以及模块化的程序编写方法,着重说明了KS0108液晶控制器的特点、使用方法,图形点阵型液晶显示模块的内部结构、时序、控制命令及其与单片机的接口电路。     

Does money matter for schools?

There is considerable disagreement in the academic literature about whether raising school expenditure improves educational outcomes. Yet changing the level of resources is one of the key policy levers open to governments. In England, school expenditure has increased by about 40% since 2000. Thus assessing whether such spending has had an impact on educational outcomes is of paramount importance. We address this issue using data of better quality than what are often available in similar studies and test our identification assumption by use of a falsification test. We find that the increase in school expenditure over recent years has had a consistently positive effect on outcomes at the end of primary school. Back-of-envelope calculations suggest that the investment may well be cost-effective. There is also some evidence of heterogeneity in the effect of expenditure, with higher effects for students who come from economically disadvantaged backgrounds.     

多功能智能婴儿床的设计

为解决父母与婴儿之间生物钟不一致的问题,以AT89C52单片机为核心,采用声音、温度、湿度等传感器对熟睡的婴儿进行监测,运用传动系统和音乐播放系统对婴儿半夜醒来哭闹进行处理与调节,改善婴儿的睡眠环境,提高父母和婴儿的睡眠质量。本设计能很好的帮助父母照顾小孩,具有很强的实用性。     

集成运算放大器参数测试仪设计

本集成运算放大器参数测试仪,以单片机AT89S52为核心,由可编程键盘、显示接口芯片8279构成的键盘、显示电路、MAX191的A/D转换等模块组成。设计中采用了模块化的设计方法,实现了对集成运算放大器输入失调电压、输入失调电流、交流差模开环电压增益和交流共模抑制比参数的测量。     

一种宽带、高增益、低噪音功率放大器的设计

介绍了一种实现宽带、高增益、低噪音功率放大器的实现方案,该系统以AT89S52芯片为控制核心,采用仪表放大器INA128作为输入级来减少噪声干扰,利用可变增益宽带放大器AD603组成中间级来提高增益和信噪比;末级功放管采用分立的大功率MOS晶体管。本系统运行稳定,指标达到了设计要求,人机界面良好。     

基于S52的电子海图显示优化

在深入研究IHOS-52"电子海图显示与信息系统海图内容与显示规范"的基础上,提出了几种可以提高电子海图显示效率的方法。     

Innovation strategy, firm survival and relocation: The case of Hong Kong-owned manufacturing in Guangdong Province, China

Based on a survey adapted from the Fourth European Community Innovation Survey (CIS-4), this study finds that, in the changing manufacturing environment of Guangdong Province in China, Hong Kong-owned businesses that generate a higher share in new product sales as a percentage of total sales or engage in R&D or collaborative innovation activities in China are more likely to survive and remain in Guangdong. The study fills a gap in the literature by investigating the effects of innovation on the survival and relocation of Hong Kong-owned manufacturing firms in Guangdong. The results support policy initiatives that strengthen collaborative ties among key innovation system actors.     

基于AT89S52的仿形切削恒速控制的研究

仿形切削是在工业现场中常用的一种便易的切削方式,本文提出了以AT89S52单片机为核心的仿形切削中电机恒速运转的控制方法,给出了系统的主电路简单结构,以及控制电路设计和软件系统的设计。本系统的设计顺应了目前国外发展的趋势,充分利用了单片机的优点,避免安全可靠性差、故障率高等问题,增强系统的安全性。     

多通道温湿度采集系统的研究与实现

结合一体化温湿度传感器与单片机的特点,设计完成了一套多通道温湿度监控系统。实现了温湿度测量与监控系统的软硬件开发。     

新型电加热型恒温振荡器的设计

本设计的电加热型振荡器是一种同时具有加热和振荡功能的恒温振荡的新型装置,通过控制电路的硬件设计来实现恒温、精确定时、产生振荡的要求.本装置已获实用新型专利.