Using the panel data of 274 cities from 2011 to 2019, this article studied the impact of the digital economy on the low-carbon transformation and space overflow effect on the city’s low-carbon transformation and used the panel threshold model to calculate the regulatory effect of public attention. Studies found the following: (1) The digital economy, the urban low-carbon transformation level, and public attention show regional differences, manifesting as the distribution of "point clusters" and "decreasing from east to west", and as far as the speed of change, after the year 2015, the annual increase of various indicators increased. (2) The role of digital economy development and urban low-carbon transformation levels have a "U" relationship. At present, most cities across the country have passed the point of inflection, which presents a significant promotion effect. However, in a comparison of regional coefficients, the Eastern region > Western region > Midlands. (3) The development of the digital economy has a significant “siphon effect” on the impact of urban low-carbon transformation. (4) With the increase in public attention in the region, the positive promotion of the digital economy on the urban low-carbon transformation has gradually increased.
Using digital technology to promote green transformation has important guiding significance for policy construction and practical promotion of green transformation, but its impact path is unclear. Based on the panel fixed effect model, this paper uses the data of 30 Chinese provinces (Tibet is not included) from 2011 to 2019 to examine the impact of digital technology on green development level and the mediating effect of public green attention on green development level. The results show that there is an inverted U-shaped relationship between digital technology and green development level. At present, although China’s digital technology directly inhibits the level of green development, it can indirectly enhance the level of green development and help green transformation by enhancing the public’ s attention to green. And in the proposed emphasis on digital technology to guide public opinion to focus on green development, it is necessary to distinguish between the eastern and central and western regions according to different conditions in each region, and then implement different green transformation strategies. Provinces and cities in the eastern region should regard foreign enterprises, private enterprises and state-owned enterprises as the same and jointly assume the responsibility of green development. Provinces and cities in the central and western regions need to further improve infrastructure construction and actively guide green transformation.
Aiming at the problems of safety and monitoring beyond the existing experience in the construction of the subway stations with arch cover method in Dalian, China, combined with the real-time monitoring requirements of intelligent construction status, a multi-information construction monitoring system based on digital twin(DT) and Internet of Things(IoT) is proposed, and the digital twin 3D architecture is established. First, on the basis of the IoT monitoring experience of tunnel, the installation plan of the automatic monitoring device of the arch cover method subway station is clarified, and the sensor arrangement is carried out. Then, based on the Revit platform, the establishment of the main structure model of the station and the BIM parametric modeling technology of the sensors are realized, and the monitoring properties of the sensors are expanded. Finally, through the design of the BIM database and in the form of secondary development, a BIM-based construction information visualization monitoring system is established to realize the correlation between the sensor model and the monitoring data and achieve the effect of information visualization query and color change early warning. The system was initially applied at Shikui Road Station of Dalian Metro Line 5 and achieved good results. The system can intuitively reproduce and accurately describe the subway station construction status, which provides an advanced technical means for the informatization and visualization management of the construction of arch cover method subway stations.
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