Smart city evaluation is a critical component in smart city construction and plays an important role in guiding and promoting smart development of cities. Currently, existing research and applications of smart city evaluation are still in the exploration stage. They mainly focus on evaluation of one single aspect, use indicators with distinct regional characteristics and poor extensibility, and cannot be well-integrated with common and shareable smart city frameworks; these limitations have led to biased evaluation results. Based on a common and shareable smart city framework, this paper proposes a well-integrated, universal, strongly practical, and highly extensible evaluation system. Then, using the above-mentioned evaluation system, 17 smart cities in China are assessed. This application demonstrates that the evaluation system plays an important guiding role for better understanding the overall smart city platform construction situation in China, performing horizontal comparisons and establishing benchmarks among smart cities. Comparative analyses of indicators demonstrate that future smart city construction in China should pay more attention to novel innovations, the construction of dynamic information resources and spatiotemporal big data.

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The sintered magnets with the nominal composition of Sm(Co0.65Fe0.26Cu0.07Zr0.02)7.8 were prepared by standard metallurgical method. The evolution of phase transformation of the specimens during heat treatments was investigated in detail. After isothermal aging at 1103 K for 20 hrs and step cooling to 673 K and keeping for 10hrs, the remanence Br of the specimens almost keeps constant (∼11.5 kGs), while the intrinsic coercivity Hcj increases from 7.9 to 31.5 kOe. The maximum energy product of the final magnet is close to 32 MGOe. The phase is single phase with 1:7H structure in the specimen A only annealed at 1453 K for 4hrs. It is found that a cellular microstructure with a platelet Z-phase have appeared in the sample after the isothermal aging in 1103 K for 20h, which contain 2:17R, 2:7R and 5:19H phases. Furthermore, the 1:5H phase has appeared after the step cooling to 873 K, together with some 2:17R, 2:7R and 5:19H phases. Interestingly, it is found that the phase transformation has completed after the step cooling to 773 K. And the phase constitution in specimens is stable during the step cooling to 673 K.