Train wheel sets must be periodically inspected for possible or actual premature failures and it is very significant to record the wear history for the full life of utilization of wheel sets. This means that an online measuring system could be of great benefit to overall process control. An online non-contact method for measuring a wheel set’s geometric parameters based on the opto-electronic measuring technique is presented in this paper. A charge coupled device (CCD) camera with a selected optical lens and a frame grabber was used to capture the image of the light profile of the wheel set illuminated by a linear laser. The analogue signals of the image were transformed into corresponding digital grey level values. The ‘mapping function method’ is used to transform an image pixel coordinate to a space coordinate. The images of wheel sets were captured when the train passed through the measuring system. The rim inside thickness and flange thickness were measured and analyzed. The spatial resolution of the whole image capturing system is about 0.33 mm. Theoretic and experimental results show that the online measurement system based on computer vision can meet wheel set measurement requirements.

Smilacis Glabrae Rhizoma is a traditional food in China. Although phytochemical and pharmacology studies have been performed, the antioxidant constituents have not been characterized with the exception of astilbin. In the present study, six antioxidants in Smilacis Glabrae Rhizoma were determined by high-performance liquid chromatography with ultraviolet and mass spectrometry detection using 1,1-diphenyl-2-picrylhydrazyl and 2,2′-azinobis (3-ethylbenzthiazoline-6-sulfonic acid) assays. These analytes were 5-O-caffeoylshikimic acid, polydatin, neoastilbin, astilbin, neoisoastilbin, and isoastilbin. The relative Trolox equivalent antioxidant capacity of each compound was determined using the two protocols. Moreover, antioxidant fingerprints were constructed for quality evaluation of Smilacis Glabrae Rhizoma and principal component analysis was performed to provide a guide for customers and producers to ensure the quality of the raw materials. The methodology may be used for the analysis of Smilacis Glabrae Rhizoma and potentially for other plant-based products.