基于ZigBee技术的瓜田自动灌溉系统的设计

针对瓜田比较分散且覆盖范围较大,文中提出了一种基于ZigBee技术的瓜田自动灌溉系统。该系统采用分布式无线网络进行监控,通过搭载CC2530芯片的硬件电路,采集环境温度和湿度,利用远程无线ZigBee来控制现场灌溉阀门,最终实现瓜田管理的智能化。通过现场测试结果表明,该系统稳定、高效,具有良好的实用性及较大的推广价值。     

基于动态手势的人机交互系统的研究与设计

本文描述一个基于手势手套、无线中继控制站、上位机端等部分组成的包含手势采集、传输、识别控制及处理的系统。手势手套主要由弯曲传感器、陀螺仪加速度计、电阻电压转换电路和无线通信模块组成,来实现手势信息的采集、去噪、前压缩、解算等功能,并通过无线通信将实时手势信息交付给上一层;无线中继端将其与多种传感器电路、显示屏、摄像头、通信接口和常用的工业控制接口等集成到一块上,采集其他传感器信息结合前级的手势信息,在短时间深度上对多种信息进行融合并通过控制算法输出给控制器件。上位机主要负责手势信息的建模还原和更长时间序列上和多维度的信息处理;网络云端可以实现手势信息的大数据处理、匹配和远程交互等功能。经实验检测达到了理想的设计要求。     

Synchronization of nanowire-based spin Hall nano-oscillators

The synchronization of the spin Hall nano-oscillator (SHNO) device driven by the pure spin current has been investigated with micromagnetic simulations. It was found that the power spectra of nanowire-based SHNO devices can be synchronized by varying the current flowing in the heavy metal (HM) layer. The synchronized signals have relatively high power and narrow linewidth, favoring the potential applications. We also found that the synchronized spectra are strongly dependent on both the number and length of nanowires. Moreover, a periodic modulation of power spectra can be obtained by introducing interfacial Dzyaloshinskii-Moriya interaction (iDMI). Our findings could enrich the current understanding of spin dynamics driven by the pure spin current. Further, it could help to design novel spintronic devices.