Effect of Mn doping on the structural, photoluminescence and photocatalytic photodegradation properties of Zn1−xMnxO have been studied. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence and UV-visible (UV-Vis) spectroscopy. XRD analysis showed that Zn1−xMnxO can keep a single phase of wurtzite structure at low Mn doping. UV-Vis spectra of Mn-doped samples showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels.

This paper aimed to solve the problems that traffic detector which was used in china, can't satisfies the multifunction and high-accuracy needs of the domestic traffic survey and traffic volume measurement.We designed a traffic detection system based on laser and piezoelectric technologies,which is made up of laser speed sensor, laser scanning sensor, piezoelectric axle shaft sensor, data acquisition unit, software system and server, and their application was discussed in detail. The working principles of laser speed sensor, laser scanning sensor, piezoelectric axle shaft sensor were presented, and the detection parameters of the system were put forward. The whole structure and data processing flow of software system were also pointed out. Through test verification, the multifunction and high-accuracy characteristics of the system were verified. This traffic detection system has great significance for enhancing the research level of the domestic traffic survey and traffic volume measurement.

304 stainless steel is deemed an indispensable material in the industry. In many instances, the surface of the production equipment needs to be treated for low-corrosion passivation, lower surface roughness, good degree of finish and cleanliness. The process characteristics of pulse electrochemical polishing meet these requirements well. The current study investigates the effects of the major processing parameters on the surface reflectivity and the surface metallography. The electrolyte with 29.4% water content and a ratio between H2SO4and H3PO4of 2 and 4 has been proven to be successful, showing no corrosion pitting points on the specimen surface. The electrolyte temperature of 50~55°C, the pulse duty ratio of 33~50% and the electrical current density of 50 to 55A/dm2are found to be optimal. The addition of 2.4% glycerin and 2.2% glucose provides a very fine surface, surface reflectivity of stainless steel from 18% improve 89%.

We study the effect of Mn doping on the photocatalytic photodegradation properties of Zn1−xMnxO nanomaterials to the methyl orange. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. UV-visible (UV-Vis) spectroscopy was used to examine the radiated and non-radiated samples to study their photocatalytic photodegradation property of the methyl orange. Our results showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels, and there exists an optimum Mn doping (x~0.18) at which photodegradation efficiency is nearly optimized.