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Electrochromic technology has been widely used in many fields, such as building windows and car rear-view mirrors. Ion storage layers (generally anodic electrochromic materials) are significant for improving the performance of electrochromic devices and realizing the application of the technology. Its role is to store and supply the ions needed for the color change reaction, maintaining the charge balance of the entire electrochromic process. At present, the most typical anodic electrochromic material is nickel oxide(NiO). The cheap NiO film has high coloration efficiency and large range of optical transmittance, so it is widely used in the electrochromic technology. This paper overviews the research progress of anodic electrochromic materials in recent years, including material classification, working principle and characteristic requirement, and also introduces the film preparation methods. Developing simple and cost-effective film preparation process is the research focus of electrochromic technology. At the same time, some methods for improving the performance of anodic electrochromic materials, and prospects the development trend are introduced.

In view of problem that early weak fault features of rolling bearings were difficult to extract, a denoising method of vibration signal of rolling bearing based on multi—criteria fusion was proposed. EEMD method was used to decompose original vibration signal to obtain a set of IMF components, then correlation coefficient of each IMF component and original vibration signal, J divergence of envelope spectrum of each order and original vibration signal, and kurtosis value of each IMF component are calculated. Effective IMF components are selected according to correlation coefficient criterion, J divergence criterion and kurtosis criterion, and the simultaneously retained IMF components are used as the effective component for signal reconstruction. The experimental results show that the can effectively suppress modal aliasing problem in EMD, and at the same time weaken low frequency noise and highlight high frequency resonance component, and has good adaptability.