对高等职业教学方法的初探

高等职业教育是培养高等技术应用型专门人才，从教学方法上的创新、加强实践课程、突出综合素质培养等几方面对高等职业教学方法进行了初步探索。     

基于单片机电压检测实验平台的设计与实现

为了能够融会贯通所学电子技术和单片机知识,设计开发了适合学生学习的基于单片机的电压测量的实验平台。从实验平台硬件电路设计和单片机软件系统设计两个主要方面对设计进行了深入的分析。介绍了实验平台由220V市电转换成被测电压信号的过程及电路以及信号通过A/D转换器MC14433接入单片机进行按键控制和LED显示的过程,实现了单片机测量直流电压并显示,并且该实验平台在学生的学习实践中取得了良好效果。     

基于单片机交直流数字电压表的设计

本文介绍一种基于AT89S51单片机的高精度直流电压和交流电压有效值的测量方法,给出由单片机AT89S51、A／D转换器ICL7135、真有效值AC／DC转换器AD736组成的简易数字电压表,测量交直流电压范围在0-±200伏,使用LED数码管显示,可以与PC机进行串行通信。     

基于开环振荡器阵列磁振荡效应的全光开关

We demonstrate an all-optical switching of the magnetic resonance properties associated with a metallic Split Ring Resonator（SRR） array. The periodically spaced elements are fabricated on a high-resistivity silicon wafer and probed by using conventional Terahertz （THz） time-domain spectroscopy. We use a continuous-wave laser diode to generate carriers in the gaps of the SRR elements. Using a sufficient power, this opti- cal excitation can create an effective short gap, which would switch the resonant properties of the metamaterial from that of an SRR array to that of a closed ring resonator array and leads to dramatic changes in the THz transmission. In the present experiment, the optically induced switching is associated with the magnetic reso- nance. However, with appropriate changes in the device structure, this approach can be extended to switch a medium with a negative real index of refraction to a medium with a positive real index of refraction. This opens the way to creat a broad new range of active devices.