基于单片机的电动栏杆机控制系统

本论文介绍了一种基于单片机的电动栏杆机控制系统。此控制系统以单片机为控制电路的核心,采用霍尔传感器检测栏杆机的角度位置,并利用脉冲调制法驱动直流力矩电机。     

基于单片机的步进电机开环控制系统

设计利用了ATMEL89C51单片机对步进电机进行控制．该文主要介绍了步进电机控制器、驱动电路和LED显示电路的设计,其中重点阐述了脉冲产生电路以及对速度的控制．设计成功实现了步进电机的开环控制．     

汽车制动灯控制器设计与仿真

本控制器以STC89C51RC微控制器核心,采用Proteus和Keil C51进行硬件电路设计和软件设计、C51编程,开发了一款高性价比的新能源汽车制动灯控制器,并在Proetus环境中进行了软、硬件联合仿真、测试与验证。     

以发动机余热为热源的公共汽车供暖空调研制

作者设计了一种以汽车发动机余热为热源、采用微机控制技术的公共汽车供暖装置。试验证明该装置具有功率大、热能利用率高、升温快的特点。与独立燃烧式供暖装置比较,该装置只有风机、水泵等,能耗极少、无环境污染。     

Experiences with Competitive Tendering of Bus Services in Germany

Abstract

After a long transition period with only a few isolated procedures for competitive tendering, the market for German public transport bus services has seen numerous such tenders in recent years. The results are complex. From the public transport authorities’ point of view, the main effects are a decrease in subsidy payments, with relatively low expenses relating to the tendering process (allocation, contract management). The overall level of competition is high, with five to seven bidders on average, although this has been declining in recent years. Entry barriers have been identified at significant levels for several parameters, especially with respect to the volume tendered and the revenue risk to be borne by the operator out of net‐cost contracts. Demonstrably small‐ and medium‐sized transport operators have been able to increase their market share in the starting phase of introducing tendering, with diminishing success rates in recent years. Due to the increased quality requirements in competitive tendering, the quality of public transport available has improved considerably, and environmental standards have been better implemented and sustained. As far as employees are concerned, a trend towards wages below the wage rate of private operators cannot be observed. However, their level is well below the level of public incumbent operators.     

利用单片机实现的红外通信接口

介绍了一种利用单片机实现红外通信接口的方法,只需在外部搭少量电路,就可实现单片机系统的红外通信。     

K5B型计算机联锁系统简介

详细介绍了K5B型计算机联锁系统的技术特点和硬件构成，星型分布的网络结构，二乘二取二的系统结构等。     

用VB6.0实现PC机与多个单片机串行通信

阐述了在Windows98平台下,应用VB6.0的Mscommon控件实现PC机与多个Flash单片机的串行通信方法.重点介绍了一种类似于单片机之间多机通信的通信方式的发送与接收程序的数据帧格式的设计实现.     

大功率数控直流稳压电源的研究与设计

研制了一款基于LPC933单片机的数字化通用直流大功率稳压电源.该电源具有数码显示、数字输入调压、电压调节精度高的特点.系统电压调节范围为0~15V,最大输出电流50A,具有过载和短路保护功能.通过软件编程,易于实现功能的扩展.     

基于AT89S51的交通灯控制系统设计与实现

针对目前繁忙的交通路口，设计具有调整各车流方向的通行时间、有数码管倒计时显示、以及紧急模式的交通灯控制装置。经测试，该系统运行稳定、使用方便、误差小、造价低，能有效地提高交通路口车辆通行效率。