基于单片机的智能移动加湿器的研制

该设计以STC89C52单片机为核心,小车及加湿器为控制载体,外接辅助电路。通过对采集的一系列数据进行分析、处理来选定相应的控制策略,实现加湿器在自由移动的同时进行监测、自主加湿、避障、声光报警、智能开关等功能,达到室内湿度的相对均衡,优化人们的生活环境。     

基于STC单片机的超声波测距系统设计1

在日常生活中的很多领域,如汽车倒车、移动机器人、建筑施工工地等场合,都需要距离的测量。利用STC89C52单片机和超声波发射接收器HC-SR04设计一种简单实用的测距方法,经测试具有较高的精度,有一定的研究意义。     

基于单片机的简易定时开关插座的设计与制作

使用AT89S52单片机设计并制作一个简易型定时开关插座。电路由电源电路、单片机最小系统、数码显示和按键操作电路、继电器强电控制电路四个模块组成,并使用软件和硬件进行测试。本产品能实现24小时内的时间定时,并自动断电,对一些不能长时间通电的电路能够起到保护作用,也可以作为定时控制器使用。     

职业学校用低频虚拟示波器的设计

介绍了一种基于AT89S52单片机和Lab VIEW实现的低频虚拟示波器。将数据采集卡所采集的数据通过USB口送到计算机,然后计算机根据虚拟面板的设置,通过调用动态链接库对数据进行相应的分析、处理,并在屏幕上显示出处理结果,实现与真实示波器相类似的功能。该低频虚拟示波器软件面板设计形象,易于操作,实用性强,可应用于职业学校的教学、实验。     

基于单片机智能灭火小车控制系统的设计简

设计了一种智能灭火小车控制系统．系统采用STC89C52单片机作为核心器件,通过C语言编程实现了小车自动寻找火源、确定灭火路线、判断并自动躲避障碍物到达火灾发生地进行灭火．通过实验智能灭火小车达到智能寻迹和自主灭火的功能,结构简单、体积小、功耗低、准确度高,具有一定的实用价值．     

Innovation and government intervention: A comparison of Singapore and Hong Kong

Government is one of the determinants for innovation capacity although its role and degree of involvement in innovation is debatable. Government intervention can be vital in supporting R&D and innovation as market alone cannot provide adequate incentives for knowledge production. Degrees of government intervention, however, vary in different economies and range from directive intervention by actively advising industrial policy and investing in selected areas, to facilitative intervention by creating positive environment and providing public goods for industry. This study uses Singapore and Hong Kong as two cases to explore the influence of government intervention on innovation performance. Singapore is known for strong government intervention while Hong Kong is famous for its positive non-intervention policy that minimizes the power of government in influencing the market. The comparison shows that innovation activities in Singapore are largely policy driven and dominated by big players, while in Hong Kong industry innovation is less active but the local industry has a dynamic innovation base contributed by small firms. Using a difference-in-differences analysis of USPTO patents filed by Singapore and Hong Kong, we find evidence for the effectiveness of government intervention on enhancing the technological significance and scope of innovation. The findings could shed light on the implication of government involvement in innovation.     

基于AT89S52的风扇自控系统设计

本温控风扇自控系统采用集成温度传感器DS18B20作为采集器,单片机AT89S52作为主控器,具有灵敏的温度感测功能。当温度值在高低温度之间时打开风扇弱风档,当温度升高超过所设定的温度时自动切换到大风档,当温度小于所设定的温度时自动关闭风扇,实现了风扇的自动调速功能。本设计性能稳定,控制准确,可适用于家庭使用与一般的依靠电风扇散热来降温的控制系统中。     

Introducing the DYNAMICS framework of moment-to-moment development in achievement motivation

This article introduces a new theoretical and psychometric framework describing moment-to-moment development and inter-dependencies of achievement motivation in terms of the situated expectancy-value theory, by introducing dynamical systems concepts into this line of research. As a first empirical example of a study using this framework, we examined whether task values, costs, and success expectancies measured in a learning situation (time point t) predicted themselves and each other at the next situation (t + 1; 27 min later) within a weekly university lecture.Situational task values, expectancies, and costs were assessed using the experience sampling method in 155 university teacher training students during weekly lectures for one semester, with three surveys during each weekly lesson. Data were analyzed with multilevel cross-lagged structural equation models.There were significant auto-regressions from one learning situation to the next in success expectancies and effort costs, but not in intrinsic, utility, or attainment value nor emotional or opportunity costs. There were no significant cross-lagged effects from one situation to the next in any of the measured situated expectancy-value components.As a framework to integrate dynamical systems concepts into the research on situated learning motivation, we expect the proposed DYNAMICS framework to have a substantial impact on further theory development.