基于单片机的粮仓温度测控系统设计

介绍了一种基于AT89C51单片机的温度测控系统。使用AD590作为温度传感器对粮仓内温度进行监测,实时显示温度。系统对温度的控制合理、有效,具有调试方便、精度高和可靠性好等优点。     

步进电机细分驱动系统设计

为了提高步进电机的运行精度,消除或减小振动现象,文章基于细分驱动技术,以单片机ATmega128为核心,应用恒流斩波PWM发生电路和H桥功率驱动电路设计了步进电机的驱动系统。系统控制参数通过上位机设定,以串口通信传给单片机。实验结果表明：电机运行平稳,振动噪音小,转矩大,精度高,系统具有良好的应用前景。     

探索单片机教学改革 提高学生工程实践能力

针对当前企业对人才的要求和单片机技术的发展,文章阐述了单片机教学改革的必要性.对单片机教学内容、理论和实践教学方法,以及考核方法改革进行了探索.对编程语言的选择,如何增强学生的学习兴趣、如何合理融合理论实践教学、如何提高学生创新能力及工程实践能力提出了一些改革的建议.     

ISD4000系列语音芯片开发平台设计

针对ISD4000系列语音芯片的应用,设计出语音芯片开发平台。给出了单片机的硬件设计方法和软件设计流程图,分析了上位机软件的开发工具和软件设计方法。该开发平台可以把上位机中的语音信息录制到ISD4000系列的语音芯片中,也可以把母片上的语言拷贝到子片中。测试结果表明,该平台可以可靠地把声音信息录制到语音芯片中。     

How stressful are economic competitions in the lab? An investigation with physiological measures

Competition is ubiquitous in economic life. Yet, negative consequences of competitive environments have been reported and everyday experience suggests that competitive situations can be very stressful. It is, however, an open question whether or not economic competitions in the laboratory indeed elicit physiological stress reactions. Our study examined subjectively perceived stress and physiological changes induced by a well-established economic laboratory competition paradigm (first used in Niederle & Vesterlund, 2007) in a mixed-gender sample of 111 healthy participants. A mental arithmetic task was performed first under a piece rate (i.e., non-competitive) payment scheme and afterwards under a tournament condition. In a third round, participants decided how to be paid (i.e., piece rate or tournament). Our results indicate that compared to a control group, which performed only the non-competitive condition, the competitive game condition elicited subjective and physiological reactions that are indicative of mild stress, i.e., an increase in heart rate and a decrease of calmness and mood. Furthermore, reactions that are thought to reflect an active coping style were related to the self-selection into competition in the third round of the game. We speculate that real-life economic competitions might be even stronger stressors and the way how people cope with this kind of stress might be related to competitiveness in real-life economic contexts.     

Impulsivity and household indebtedness: Evidence from real life

Using a probit model, we estimated the role of emotional factors in determining household participation in the debt market, after controlling for such traditional economic predictors as age, level of education, income, wealth, and work status. A sample of 445 Caucasian subjects selected among fulltime employees at international asset management companies underwent the Barratt Impulsiveness Scale, the Iowa Gambling Task (IGT) while skin conductance was recorded, and a series of questions related to their demographic-socio-economic profile. Aside from confirming the role played by traditional explanatory variables commonly used as determinants of household indebtedness, results revealed the significant influence of individuals’ impulsivity in making debt decisions. Impulsivity predicted unsecured debt (i.e. consumer credit), but it was not significantly associated with secured debt (i.e. mortgages). Neither presence of a somatic marker to guide decisions nor performance at the IGT predicted real-life indebtedness decisions in this non-clinical sample. The notion that “non-rational” factors influence debt demand has been largely ignored and raises concerns about the risk of over-indebtedness for impulsive individuals.     

基于msc52的无线承载平台平衡调整系统

设计了一套无线承载平台平衡调整系统,该系统采用msc52单片机作为主控芯片,由可调稳压电源模块提供负载电压,选用2．8英寸TFT液晶屏作为角度显示输出,PS／Z接口小键盘和2．4G无线遥控器作为角度设定榆入。机械方面采用8mm厚有机玻璃作为承重平台,水平滑轨和球形关节提供所需的自由度,使用角铝连接各个部件以保证足够的机械强度。控制方面采用简化PID算法,通过分级微调反馈深度实现平台的高精度控制,同时消除震荡。系统能够实现语音播报倾角、平衡报警、单键平衡等功能。     

蠕动式点胶机的精确点胶研究

为了改善传统点胶机不易控制流量的问题,在分析蠕动泵的基础上,建立蠕动泵的模型并进行理论流量的推导;然后对蠕动泵的步进电机进行分析,提出采用ATmega2560微控制器外接驱动器A4988细分驱动技术方案,对蠕动泵步进电机控制系统进行设计;对单个点胶过程提出采用S型曲线规划Z轴的运动,实验证实采用蠕动泵进行点胶达到了良好的点胶效果,本研究提高了点胶质量。     

I^2C总线器件及其通用单片机软件接口

本文简要介绍Ｉ２Ｃ总线规范，并以Ｉ２Ｃ总线器件２４ＬＣ０２Ｂ与Ｉｎｔｅｌ８０９８单片机的接口为例，介绍了在通用单片机应用系统中Ｉ２Ｃ总线的软件实现方法。     

改进的M/T法在电机测速中的应用

转速控制系统中,电机转速作为反馈量构成闭环控制。因此,电机转速测量的精度对控制系统性能有着至关重要的作用。文章采用基于一种精度得到较大提高的改进M/T法理论来设计的单片机来测量电机速度。在变频器控制电机中的实验结果表明,使用改进的M/T法测量精度高,测量范围广。