Mechanical expanding process for large diameter line pipe, a detailed analysis of factors affecting the quality of the final products of the mechanical expansion and proposed optimization using orthogonal array optimization method, as an indicator of dimensional accuracy and shape accuracy of the products, combination of a variety of specifications of mechanical expanding products, the main process parameters to be optimized. Analysis and discussion of results, revealing the degree of influence of various factors on the quality of the final product, and gives the optimum combination of the results. Experiments show that the combination of optimized process parameters, and more help to improve the accuracy of the size and shape of products.

The total dynamic changes of the cultivated land and food production from 1990 to 2010 in Anhui Province were analyzed using the statistic data and minimum cultivated land per capita and pressure index on cultivated land were calculated based on cultivated land, food production and population. At the same time, adopting GM(1,1) model, per capita cultivated land area, minimum cultivated land per capita and pressure index on cultivated land were forecasted in the future7 years. The results show that: (1) the total amount of the cultivated land decreased on the whole, steady decline early, while increased considerably late; Grain output went up steadily in the fluctuation in general; and the change of minimum cultivated land per capita and pressure index on cultivated land was not significant. (2) GM (1,1) gray model shows per capita cultivated land area, minimum cultivated land per capita and pressure index on cultivated land decreased, and arable land per capita is higher than the minimum per capita arable land area which descript farmland productivity levels higher than the level of food consumption.

According to statistical data of Fuzhou City, using Delphi method and weight method, we established decision matrix of urban public transportation development mode and estimated the urban public transportation development mode. The result show that bus rapid transit system is the optimal public transportation mode for Fuzhou city, followed by conventional public transport system, then, for light rail system. And that bus rapid transit system matching with urban passenger transportation is good in Fuzhou city

In order to reduce the cost of washing machine clutch, clutch manufacturing process to improve through conventional washing machine JLX-N-5.0 clutch structure analysis, a new structure of the washing machine clutch, in ensuring the technical performance of the major premise, the clutch brake structure was improved to cancel one-way bearing, narrow diameter brake wheel, change the brake means and planetary gear train positioned. Comparative experimental results show that the clutch brake performance and a substantial increase in operating performance, with simple technology and low cost characteristics.

In order to reduce the cost of washing machine clutch, clutch manufacturing process to improve through conventional washing machine JLX-N-5.0 clutch structure analysis, a new structure of the washing machine clutch, in ensuring the technical performance of the major premise, the clutch brake structure was improved to cancel one-way bearing, narrow diameter brake wheel, change the brake means and planetary gear train positioned. Comparative experimental results show that the clutch brake performance and a substantial increase in operating performance, with simple technology and low cost characteristics.