In order to provide a theoretical basis for reasonable material selection in oil and gas field, according to the actual situation of a water source well, materials N80, 3Cr, H13, 13Cr and super 13Cr were selected as the research objects. The microstructure and hardness of N80, 3Cr, H13, 13Cr and super 13Cr were studied by metallographic observation and hardness test. By simulating the actual corrosion environment of the water source well, the experiment of autoclave hanging sheet and detection of corrosion products by X ray diffraction and the CO2 corrosion resistance of N80, 3Cr, H13, 13Cr and super 13Cr were analyzed. Besides, some suggestions for material selection of oil and gas wells were put forward. It is found that super 13Cr has higher hardness and CO2 corrosion resistance, 13Cr and 3Cr are second. When selecting oil and gas field water well material, it is recommended to choose super 13Cr first, then 13Cr and 3Cr.

Based on the survey results of the residents of Shanghai, the article analyses the different perception of economic impact of Expo among people who have been divided into several different age groups though the analysis of 13 major indexes which reflect the perception of economic impact of Shanghai World Expo in order to guide the planning, operations and development of larger-scale activities and establish a harmonious relationship to achieve mutual benefit among tourists, community and large-scale activities. We hope to provide some references for government, planners of large activities and the other related organizations of activities.

In this study, the thermal properties of a kind of new geotextile materials, so called controlled permeable formwork (CPF), were studied. Thermo-gravimetric analysis showed that the weight of CPF didn’t change much between 0~350 °C. Dynamic mechanical analysis showed that the storage modulus of CPF reduced from 25 MPa to around 10 MPa when the temperature rose to above 100 °C. The strength of sample decreased slightly with the increase of the temperature. The breaking elongation changed slightly with a maximum at 80 °C. The CPF showed excellent thermal stability and was suitable for general use in construction work.