To realize the accurate control of water hammer in pipes by valve stroking, based on basic differential equations of water hammer subjected to initial and boundary conditions, the traveling solution of wave equations ...To realize the accurate control of water hammer in pipes by valve stroking, based on basic differential equations of water hammer subjected to initial and boundary conditions, the traveling solution of wave equations in finite region was applied to the linear water hammer problem. With the given velocity function at the valve and the introduction of curve integration independent of integral path, the exact analytic solution of dimensionless water hammer pressure was obtained in the course of valve closing. Based on the definition of eigen wave height, optimal eigen wave height and observation time, the control goal of water hammer pressure and the judgment rule of the optimal eigen wave height were determined, then the optimal velocity function in the calculated example was derived, which can reduce the water hammer pressure maximally. According to this function, a valve closing program was set, and the optimal control of water hammer could be realized.展开更多
Reimbursement policy for outpatient chronic diseases is an important part of the basic medical insurance scheme in China. The reimbursement policy for outpatient chronic diseases in basic medical insurance for urban r...Reimbursement policy for outpatient chronic diseases is an important part of the basic medical insurance scheme in China. The reimbursement policy for outpatient chronic diseases in basic medical insurance for urban residents of provincial capitals in China were analyzed from the perspectives of disease types, benefits package, qualification and health service access. Proposals to improve policy design, establish standardized disease inclusion criteria and set reasonable benefits package, strengthen management and complete supporting policy, strengthen policy coordination were put forward according the existing problems such as fragmented policy, great difference in disease types and benefit package, supervision difficulty, incomplete policy framework and lack of policy coordination.展开更多
基金Sponsored by the National Natural Science Foundation of China (Grant No. 50478025 and 50506009) the 46th China Postdoctoral Science Foundation(Grant No.20090460912)
文摘To realize the accurate control of water hammer in pipes by valve stroking, based on basic differential equations of water hammer subjected to initial and boundary conditions, the traveling solution of wave equations in finite region was applied to the linear water hammer problem. With the given velocity function at the valve and the introduction of curve integration independent of integral path, the exact analytic solution of dimensionless water hammer pressure was obtained in the course of valve closing. Based on the definition of eigen wave height, optimal eigen wave height and observation time, the control goal of water hammer pressure and the judgment rule of the optimal eigen wave height were determined, then the optimal velocity function in the calculated example was derived, which can reduce the water hammer pressure maximally. According to this function, a valve closing program was set, and the optimal control of water hammer could be realized.
文摘Reimbursement policy for outpatient chronic diseases is an important part of the basic medical insurance scheme in China. The reimbursement policy for outpatient chronic diseases in basic medical insurance for urban residents of provincial capitals in China were analyzed from the perspectives of disease types, benefits package, qualification and health service access. Proposals to improve policy design, establish standardized disease inclusion criteria and set reasonable benefits package, strengthen management and complete supporting policy, strengthen policy coordination were put forward according the existing problems such as fragmented policy, great difference in disease types and benefit package, supervision difficulty, incomplete policy framework and lack of policy coordination.
