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In this study, the greenland tree and shrub communities in Forest Park, a typical park greenland in Yingkou City, Liaoning Province, were used as the research object to compare the noise reduction of different communities, and to study the degree of noise reduction of the plant communities in summer. The results show that the noise reduction level of vegetation communities in summer is in the following order: M2 cypress + cypress + acacia > M1 poplar + Euphorbia + maple > M3 cypress + yellow thorn rose + ginkgo tree.

As the information reflection of social economy, the quality of accounting information is closely related to economic development and market operation system. And accounting conservatism is one of the important standards to measure of quality of accounting information. As the maker and executor of the financial strategy of the listed company, the CFO’s different personal characteristics will affect its choice of different accounting policies, thus affecting the accounting conservatism of the enterprise. Therefore, this paper selects CFOs of A-share listed companies in Shanghai and Shenzhen from 2016 to 2018 as research objects, respectively discusses the influence of CFO’s natural attributes and social attributes on accounting conservatism, and analyzes the moderating effect of property rights and CFO’s power on the relationship between them. The results show that the CFO’s age, tenure, education, professional skills, salary and number of part-time jobs are negatively correlated with accounting conservatism. The female CFO, shareholding and concurrent director are significantly positively correlated with accounting conservatism. The difference of property right nature and CFO power moderates the relationship between CFO characteristics and accounting conservatism to some extent. On this basis, this paper puts forward corresponding suggestions on how to improve accounting conservatism and promote economic development.

Prefabricated solar collector panels is a kind of new permeability structure of collector panels. For this test, we adopt a certain proportion of copper oxide, magnesium oxide and iron oxide to enamel paint as absorbed panel coating and make two kinds of collector panels for different forms of color by dark green coating and black coating. By the methods of comparison, the two kinds of panel collector efficiency and heat loss coefficient UL were tested. The results showed that there was a slight difference between the heat loss coefficient of prefabricated solar collector panels, using the panel with dark green coating’s comprehensive thermal effect is well than the panel with black coating. The beautiful appearance color is more suitable for building requirements.