The ceramic coating technology of microarc oxidation (MAO) was utilized to modify surface properties of the movable endplate of a high pressure gear pump used in water-hydraulic system, which is made of aluminium allo...The ceramic coating technology of microarc oxidation (MAO) was utilized to modify surface properties of the movable endplate of a high pressure gear pump used in water-hydraulic system, which is made of aluminium alloy. A coMPact ceramic layer of more than 130 μm was developed on the movable endplate with the hardness up to HV1000 by means of microarc oxidation. A trial of tests conducted in a water power transmission system show that the maximum outlet pressure of the gear pump with the movable endplate treated by microarc oxidation, can reach 16 MPa. It is pointed out that the ceramic coating developed by microarc oxidation technology on the surface of aluminium alloy, is economical and feasible.展开更多
Using a large, unique county-level panel dataset for China from 1998 to 2006, this paper investigates the relationship between local governments ＇fiscal pressure and their preference for developing polluting industr...Using a large, unique county-level panel dataset for China from 1998 to 2006, this paper investigates the relationship between local governments ＇fiscal pressure and their preference for developing polluting industries. The results show that there exist fiscal pressure effects; namely, a positive link between the fiscal pressure faced by a county and its industrial tax dependence on polluting industries. We also investigate the heterogeneity of the fiscal pressure effects and find that fiscal pressure effects are significant only when local fiscal pressure is sufficiently high up to a certain point, and when there are more earmarked transfers. In contrast to the situation in east China, fiscal pressure effects in central and west China are more pronounced Therefore, when dealing with environmental problems, policy-makers need to take local governments＇ fiscal conditions into account.展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.60772077)
文摘The ceramic coating technology of microarc oxidation (MAO) was utilized to modify surface properties of the movable endplate of a high pressure gear pump used in water-hydraulic system, which is made of aluminium alloy. A coMPact ceramic layer of more than 130 μm was developed on the movable endplate with the hardness up to HV1000 by means of microarc oxidation. A trial of tests conducted in a water power transmission system show that the maximum outlet pressure of the gear pump with the movable endplate treated by microarc oxidation, can reach 16 MPa. It is pointed out that the ceramic coating developed by microarc oxidation technology on the surface of aluminium alloy, is economical and feasible.
文摘Using a large, unique county-level panel dataset for China from 1998 to 2006, this paper investigates the relationship between local governments ＇fiscal pressure and their preference for developing polluting industries. The results show that there exist fiscal pressure effects; namely, a positive link between the fiscal pressure faced by a county and its industrial tax dependence on polluting industries. We also investigate the heterogeneity of the fiscal pressure effects and find that fiscal pressure effects are significant only when local fiscal pressure is sufficiently high up to a certain point, and when there are more earmarked transfers. In contrast to the situation in east China, fiscal pressure effects in central and west China are more pronounced Therefore, when dealing with environmental problems, policy-makers need to take local governments＇ fiscal conditions into account.
