shows that Gansu and Zhejiang were significantly different on the dependent and most independent variables. The NBR models show that at the personal-level, decreased risk of physical limitations was associated with being male, less than 60 years old, married, higher in education, and higher in household expenditures (proxy for income). At the village-level, decreased risk of limitations was associated with a continuous supply of electricity, not using coal in the household, the existence of a sewage system, low cost of electricity, and village wealth. Decreased risk of physical limitations was also associated with various characteristics of China's New Cooperative Medical Scheme (NCMS), an insurance program for rural older adults.Policy implications for improved health of rural older adults include: (1) continued use of China's NCMS, (2) establishment of village sewage systems, (3) ending the use of coal in the home, and (4) increased educational opportunities focused on health.

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Servo driver can greatly reduce the harm of backlash if it owns the function of identifying backlash automatically. Aiming at the problem of backlash identification in servo drive system, the automatic identification schemes on servo driver are reviewed. Based on the dead-zone model of backlash, five different identification methods are summed up. Each implementation process is analyzed specifically, mainly interpreting assumptions, hardware requirements and the problems that will be encountered in practice. The accuracy of theoretical analysis of various solutions is verified by simulation experiment. With the comparison of those simulation results, the speed difference integral method that needs few additional conditions and simple operations can obtain the accurate identification result just by a position sensor in servo motor side.So it is feasible strongly and is the best identification scheme, and the experimental result also proves it.

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