This paper discusses the effect of network infrastructure on environmental pollution reduction and the realization mechanism behind it. Based on the panel data of 285 cities in China from 2005 to 2019, this study regards the “Broadband China” pilot policy as a quasi-natural experiment to clarify the pollution emission reduction effect of network infrastructure construction through differences-in-differences method and other methods. The research results show the following: (1) The Broadband China pilot policy has reduced environmental pollution, that is, the construction of network infrastructure has the effect of environmental pollution reduction. The conclusion is still established after a series of robustness tests such as parallel trend test, placebo test, and instrumental variable method. Through the heterogeneity test, it is found that the pollution reduction effect of network infrastructure construction is more obvious in non-resource-based cities, first and second tier cities, and cities in the eastern region (2). The construction of network infrastructure plays a restraining role on local environmental pollution. Due to the insufficient level of regional linkage and the siphon effect of pilot cities, the spatial spillover characteristics of the pollution reduction effect are not obvious (3). The mechanism of action shows that green innovation is an important mediating effect mechanism for network infrastructure construction to reduce environmental pollution. Cities in regions with high degree of marketization and environmental regulation can strengthen the effect of network infrastructure construction on environmental pollution reduction. The research conclusions are conducive to accelerating the development of the digital economy represented by the construction of network infrastructure and provide a useful reference for promoting the level of environmental pollution reduction and achieving high-quality development.
Over the past 40 years of reform and opening up, China has attracted a large number of foreign investment. However, because of China's weak intellectual property protection environment, it is difficult to protect the intellectual assets of transnational enterprises, which will affect their investment decisions to some extent. In order to optimize the intellectual property system and improve the intellectual property environment, national intellectual property demonstration city policy was proposed in 2012 to improve the institutional environment. To explore the impact of national intellectual property demonstration city policy on foreign capital inflow, we explore the relationship between national intellectual property demonstration city and foreign direct investment (FDI) using the multi‐period differences‐in‐differences (DID) method based on city panel data of China from 2003 to 2019. Results shows the following: (1) Compared with non‐demonstration cities, national intellectual property demonstration cities are profit to FDI promotion. If a city is rated as a national intellectual property demonstration city, local FDI will increase by 5% on average. After a series of robustness tests, the conclusion is still tenable. (2) We find that the national intellectual property demonstration city policy has obvious urban heterogeneity. The effect of national intellectual property demonstration city policy on the increase in FDI is more significant in central cities, western cities, and key cities. (3) The mechanism test shows that national intellectual property demonstration city policies have a positive effect on FDI through increasing the government's strategic expenditure on intellectual property, improving urban technology innovation capacity, optimizing human capital structure, and promoting the marketization of cities. Therefore, China should continue to implement the policy of national intellectual property demonstration city, especially increasing the number of national intellectual property demonstration city in key cities, central cities, and western cities. On the one hand, these findings can help government evaluate the attractiveness of demonstration cities for FDI. On the other hand, it also provides relevant policy enlightenment for the Chinese government to select appropriate demonstration cities and further refine and implement the national intellectual property demonstration city policies.
Could the environmental regulation promote green innovation? This is a very controversial issue. In view of the fact that the existing literature only studies the relationship between the two, lacks effective heterogeneity research, and pays less attention to the deeper analysis mechanism between the two. This study fills the gap. This paper selects the panel data of 285 prefecture level cities in China from 2000 to 2019 for empirical research. The results show that environmental regulation has a significant and continuous positive impact on green innovation.From the perspective of heterogeneity, we find that cities with higher level of green innovation are suitable to improve the intensity of environmental regulation; Cities with low level of green innovation can not formulate high-intensity environmental regulation policies. The intermediary mechanism shows that under the situation of stricter environmental regulations, producers will pay more attention to the promotion and accumulation of human capital, and provide strong intellectual support for green innovation activities. The adjustment mechanism shows that the cities with high degree of marketization and financial R&D investment are conducive to strengthening the promotion of environmental regulation on green innovation. On the contrary, it weakens the role of environmental regulation in promoting green innovation. In addition, this paper uses SYS-GMM model and selects appropriate instrumental variables to solve the endogeneity problem of the model. We find that after reducing the endogeneity of the model, improving the intensity of environmental regulation can still promote the level of green innovation. Using SDM decomposition model, we find that environmental regulation has spatial spillover effect on green innovation, and the formulation of environmental regulation strategy is conducive to the coordinated development of regional green innovation.
The electrochemical assembly of [Ru(bpy) 2 tatp] 2? (where bpy = 2,2 0 -bipyridine, tatp = 1,4,8,9-tetraaza-triphenylene) on the multi-walled carbon nanotubesmodified glassy carbon electrode (MWNTs/GC) in the presence of anionic and cationic surfactants has been investigated. A diffusion-controlled wave and three prewaves are exhibited on the differential pulse voltammogram of [Ru(bpy) 2 tatp] 2? . The formal potential of the prewaves is found to be much negative than that of the diffusion-controlled wave. An appropriate amount of anionic surfactants including dihexadecyl phosphate (DHP) and deoxyribonucleic acid (DNA) can prompt the assembly of [Ru(bpy) 2 tatp] 2? on the MWNTs/GC electrode by using the method of repetitive voltammetric sweeping. In contrast, cationic surfactant such as hexadecyl trismethyl ammonium chrolide (HTAC) dispersed on the MWNTs surface is found to inhibit the assembly of [Ru(bpy) 2 tatp] 2? . Meanwhile, the assembled principle of [Ru(bpy) 2 tatp] 2? on the MWNTs/ GC electrode with the participation of surfactants is discussed in detail.
Based on the externality theory, this paper estimates the city size threshold of specialized agglomeration and diversified agglomeration. We find that when the urban population is below 1.25 million, specialized agglomeration is more advantageous for improving urban labor productivity. When the urban population exceeds 0.9 million, diversified agglomeration is more advantageous for improving urban labor productivity. Moreover, Specialized agglomeration of small and medium-sized cities is more likely to play the role of Marshall-Arrow-Romer externality within the spillover radius of regional central cities. One important policy suggestion is that for areas with small administrative regions and small population, it is better to increase the level of specialized agglomeration through industrial transfer, and for areas with large administrative regions and large population, it is better to increase the level of diversified agglomeration through industrial introduction, so as to further improve the urban economic efficiency.
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