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Over the history of economic development, natural resources have always played an essential role. For instance, during the first Industrial Revolution steam engine greatly increased the efficiency of production: with the help of the combustion of black coal, and later oil, the worth of natural resources from the Earth was never devalued. For every economic entity, immense development at the beginning of the process seems inevitable, and China’s economic development follows a similar trajectory, yet with the continuing development, environmental issues are becoming non-negligible anymore in China, which could potentially drag and slow down overall economic progress. What problems is China facing nowadays and what will it face in the future, and what sort of measures can have their own practical meaning to the world? We are going to look at the details in this paper.

Over the history of economic development, natural resources have always played an essential role. For instance, during the first Industrial Revolution steam engine greatly increased the efficiency of production: with the help of the combustion of black coal, and later oil, the worth of natural resources from the Earth was never devalued. For every economic entity, immense development at the beginning of the process seems inevitable, and China's economic development follows a similar trajectory, yet with the continuing development, environmental issues are becoming non-negligible anymore in China, which could potentially drag and slow down overall economic progress. What problems is China facing nowadays and what will it face in the future, and what sort of measures can have their own practical meaning to the world? We are going to look at the details in this paper. [ABSTRACT FROM AUTHOR]

Single screw compressor (SSC), a strong competitor of the twin screw compressor, is regarded as an excellent gas compressor because of symmetrical structure and balanced gas forces on the screw rotor. However, the market for the SSC is tiny compared with that for the twin screw compressor because of the serious abrasion of star-wheel teeth. In recent years, this problem has been solved due to the development of the new profiles of meshing pairs, and the SSC has attracted more attention due to its high application potential for low-temperature heat pump, mechanical vapor recompression, and two-phase expansion. Nevertheless, there are still many technical problems remained to be solved for applying SSC to these fields urgently. In this paper, a comprehensive review on the progress and development of SSC technologies is presented. The review first combs the current situation of SSC products. Besides, the design and processing of meshing pairs are clarified and analyzed. Moreover, the working process of SSC and its performance in new applications are discussed in detail. Finally, the further research direction of the SSC is also discussed, which will be beneficial for designing high-efficiency SSC. [ABSTRACT FROM AUTHOR]

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