The crystal facet effect of tin dioxide nanocrystals on photocatalytic degradation of water pollutants and photo-assisted ammonia sensing properties was studied.

A restraint protection system for front row occupant is designed according to the collision danger level. An algorithm based on driver response time margin is designed to determine the danger level of collision. The algorithm gives different possibility of collision, corresponding to different danger level, and corresponding starting different constraint protection device. The simulation model of automobile frontal collision was established in the dynamic simulation software MADYMO and verified by experiment. Compared with the traditional occupant restraint protection system, the simulation results show that the proposed active restraint protection system improves the protection effect of the occupant’s head and hip, while the damage evaluation indexes such as peak neck bending moment, chest acceleration and chest compression decrease obviously. Therefore, the designed active occupant restraint protection system can effectively reduce the degree of occupant injury.

Abstract. It is proposed in this paper based on the research of quantifiable indicators used car evaluation system, through to the assets evaluation theory is commonly used in four kinds of evaluation methods on the basis of comprehensive analysis, chose the quantifiable as used car appraisal method of the main theoretical basis, in comprehensive consideration of various factors influencing the used-car prices, on the basis of using the weight of performance indicators will be used car evaluation method is more reasonable design, through the determination of each performance index weights, the integrated use of the weighted coefficient method for the computation of the surplus value of the car can make the used-car evaluation is more quick and convenient, the evaluation process more transparent, to accelerate the process of the construction of the used car market in China. At the same time, also makes the second-hand evaluation has the theoretical basis, reduce the used-car evaluation difference caused by human factors, so that the used car evaluation more formal, more objectively reflect the residual value of second-hand cars.

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