生态学中的物种的格局分析——聚类分析。在R软件中加载即可使用，里面的参数可调。-Ecology of the species pattern analysis- cluster analysis. In R software can be used to load, which adjustable parameters.

Active filters are being increasingly considered as a viable alternative to passive filters for meeting harmonic distortion limits. The three phase configuration based on a voltage source configuration is the most widely proposed topology. However it