详细介绍无线多跳adhoc网络的PPT.包括网络中的MAC层和路由层介绍、常用的协议算法，存在的问题，TCP与UDP协议性能比较，安全问题等，有助于了解Ad hoc网络的概况 -Details of the wireless multi-hop adhoc networks PPT. Including the network MAC layer and routing layer descr iption of the protocol algorithm used, problems,

针对谐波检测问题，比较几种常用谐波检测方法，总结出各自的适用条件。结合经验模态分解理论和总体平均经验模态分解(empirical mode decomposition，EEMD)算法，提出基于EEMD的谐波检测方法。-For harmonic detection problem, comparing several common harmonic detection method, summed up their applicable conditions. Combining theoreti