基于C8051F020的动感单车无线数据传输系统设计

采用C8051F020单片机、HK-08A心率传感器、霍尔传感器A3144E和无线收发模块NRF24L01设计动感单车控制系统和无线数据传输系统。发送端C8051F020单片机实时监测心率传感器输出的心电信号和霍尔传感器输出的反应动感单车转速的脉冲信号,并对其进行处理,通过NRF24L0无线发射模块实时发送监测数据到监控中心;监控中心通过C8051F020单片机和无线接收模块NRF24L01对接收到的监控数据进行解码,解码数据通过监控中心C8051F020单片机串口发送到上位PC机。上位PC机控制界面通过VC＋＋6.0编程实现,可以读取多个发送端的数据,并实时显示数据波形和存储数据,方便运动者实时查看和比对。本系统可以无线接收、实时显示（存储心率和转速数据）、操作界面良好,方便应用于家庭和各种类型的健身场地。     

基于TMS320F28035的电梯门机控制器设计

针对基于DSP的电梯门机控制系统,在充分分析电梯门机控制器功能需求的前提下,提出了以TI公司DSP芯片TMS320F28035为核心的电梯门机控制器设计方案,其中包括控制器硬件的模块化设计和软件设计。对所设计的控制器进行现场试验,结果表明,门机运行平稳,速度跟随性好,控制器能够很好地完成电梯门机运行过程中的控制任务。     

F1中国大奖赛在我国的消费需求及其对地区经济影响的调查研究

就F1赛车对上海及其周边地区的影响作用,通过新秦网对全国范围内18岁以上的4 939人进行了问卷调查。调查结果表明,虽然人们对于赛车文化的理解尚未深入,但是,赛车运动在中国的发展还是很有潜力的。研究认为,F1上海站赛事将会促进上海及其周边地区消费水平的提高,对促进上海及其周边地区的区域经济发展具有巨大的影响作用。     

Modelling and analysis of a basilica under earthquake loading

In this paper a basilica-type church is analysed in order to assess its structural behaviour and seismic vulnerability. For this purpose, an effective two-step procedure has been used, consisting of: (a) 3D static and dynamic linear analyses of the structural complex, and (b) 2D nonlinear push-over analysis of the single macro-elements. The results obtained through push-over analyses have been compared to the collapse loads derived from limit analysis, proving the ability of finite element (F.E.) nonlinear model to provide reliable simulation of the actual response of masonry elements. Then, the strength demand on each single structural macro-elements, resulting from the 3D linear analyses, has been compared to the macro-element ultimate strength capacity. The comparison demand vs. capacity has been carried out for all transversal and longitudinal macro-elements of the church, allowing a direct, though approximate, assessment of the seismic safety level of the church. The comparison demand vs. capacity confirms the susceptibility of this type of buildings to extensive damage and possibly to collapse, as frequently observed. The insertion of rigid diaphragms, which represents a widely used retrofit technique, has also been investigated; such intervention triggers concentration of strength demand in the stiffest macro-elements, so that the seismic capacity of the building is not necessarily increased.     

Racial similarity as a moderator variable in the perception of leader behavior and control

This study compared leader behavior ratings of black and white Army infantry squad members serving in squads led either by black or white leaders. One black and one white squad member, chosen at random from each of 34 racially mixed squads, rated their leader's Consideration and Initiation of Structure behaviors (Stogdill, 1963), and their leader's behavior relevant to French and Raven's (1959) five bases of social power. In general, it was found that members who were of the same race as their leader rated him as significantly less likely to use punishment-related behaviors than did members who were of a different race than their leader. However, same-race members did not rate their leader's considerate or structuring behavior differently than did different-race members. The overall pattern of findings were discussed in terms of the leaders' implicit reliance on their punishment power to obtain compliance from different-race subordinates.     

基于PIC单片机及阵列电路方式控制大量外设的研究

本文介绍了PIC单片机的特点,以及利用该芯片、移位寄存器74LS164和阵列电路控制继电器的开关闭合,来实现对大量外部设备的控制。该方法的实现可以有效地节省大量的单片机I/O引脚的使用个数,特别是在一些要实现的功能较多的工程中,效果更为显著。     

F4方程式摩托艇比赛电子计时系统的设计

为了提高摩托艇比赛计时系统的精确性和高效性,设计了一种电子计时系统,系统以单片机AT89C51为微控制单元,通过激光传感器,对激光进行感知,并将激光信号转化成电信号传递给单片机,系统设计了两种模式,一种是排位赛模式,第二种是竞速赛模式,分别编写了两套程序,单片机根据程序可以准确执行指令,实验表明,次电子计时系统大大提高了裁判的准确度,以及成绩编排效率,而且完全可以符合现有摩托艇的比赛规则。     

一种基于C8051F060的声波信号采集系统的设计

为了监测某区域某频率段内声波信号的强弱,提出一种以C8051F060为控制核心的声波信号采集系统的设计方案。采用压力场声波传感器将可识别的声波信号转换为适当幅度的电信号,该信号经过由程控滤波器地处理后直接送至带高速ADC的单片机进行处理,最后以SYG2401281图形点阵液晶为显示器件实现声波信号的实时显示。     

基于TMS320F2812的CANopen协议的通信实现

CANopen是一种开放的现场总线协议,是欧洲嵌入式工业控制网络的主要标准协议.在分析CANopen协议的对象字典、设备模型和通信对象等的基础上,采用CANopen协议的子协议DS301实现了基于CAN总线的TMS320F2812与主控模拟调试软件之间的通讯,并通过测试验证了通讯过程中信息传递的正确性和可靠性.     

基于VPC3+C的Profibus-DP智能从站设计

从开发的角度介绍了VPC3+C芯片的主要功能和单片机C8051F020以及软硬件设计的主要思想,分析了Profibus-DP从站的状态机,并介绍了从站与主站通讯所需的GSD文件.