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The working process of high power hydraumatic reciprocating compressor which is widely used in natural gas fueling station is introduced. The main fault forms, reasons, the present situation and methods of fault diagnosis hydraulic system in natural gas compressor are summarized. The developing direction of fault diagnosis in natural gas compressor is pointed out finally.
Housing provident fund, as the main part of China urban housing security system, provides the housing security mainly by drawing and loans. This paper estimates the total difference, regional difference and area inner difference through the estimation and decomposion of theil index. The results show that there exists very big difference in housing security development of Jiangsu housing provident...
Modern portfolio theory dates back to a seminal 1952 paper by H. Markowitz and has been very influential both in academic finance and among practitioners in the financial industry. Given a set of assets, the theory can be used to compute the amount to be invested in each asset in order to construct an optimally diversified portfolio. One of the parameters required in this calculation is the covariance...
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