As China’s emission reduction efforts continue to advance, the carbon emissions of the chemical industry have shown a gradual downward trend. However, the industry still faces challenges of high energy consumption and high carbon emissions in achieving the carbon neutrality goal. A system dynamics-based carbon emission model was constructed to simulate the carbon emissions of chemical sub-industries from 2010 to 2021.Dynamic effects of factors such as per capita consumption, fixed asset investment, and education level on carbon emissions were analyzed. The simulation results indicate that an increase in consumption levels may put pressure on carbon emissions, but significant reductions can be achieved through increased investment in fixed assets and promotion of green consumption behavior.

China has entered the era of digital economy, and the demand of enterprises for digital technology skills is increasingly prominent.In order to better meet this demand, the Chinese government has formulated a series of digital technology skills training policies. the PMC(policy modeling consistency) index model of digital technology talent training policy in Beijing, Tianjin and Hebei was established, and the model was used to conduct quantitative evaluation of related policies.It is found that the training policies of digital technical talents in Beijing, Tianjin and Hebei are qualified and can play a certain role in the training of digital technical talents. Compared with excellence, there is still a distance. Finally, some suggestions are put forward to optimize the policy of digital technical talents in the Beijing-Tianjin-Hebei region.

Youth is the hope of the country, the future of the nation, young people are the source of national strategic talent strength. In order to provide reference for the research on the strategy of strengthening the country by talents, the development trend of the research on young talents in the academic circle was systematically grasped, the frontier hot spots of the research on young talents were sort out. With the help of visual literature analysis software CiteSpace, 319 Chinese Social Science Citation Index (CSSCI) journal papers on “young talents” collected by CNKI was analyzed, and the existing research results were visualized from the aspects of the number of publications, author cooperation network, research theme, development context and research hotspots. At the same time, the shortcomings of the research on young talents and the way to further promote it in the future are put forward. The analysis shows that the current hot spots of young talents research focus on young scientific and technological talents, young talents policy, young talents training and other fields. Future research on young talents needs to be combined with national development needs, combined with the theme of The Times, combined with the characteristics of young people, to do more in-depth and specific research.

In order to better grasp the future development direction and innovative development path of transport aircraft and their propulsion systems, the first-principles analysis method was used to analyze the Breguet range equation. The results show that the innovation and development of transport aircraft mainly revolves around three dimensions, including the improvement of aerodynamic performance, the improvement of weight performance and the improvement of propulsion performance. The innovation and development of aircraft technology depends on the progress of aviation science and technology on the one hand, and is affected by the development environment on the other hand. The power is still based on the turbofan engine with large bypass ratio, and the use of new concept engines such as hybrid electric vehicles mainly depends on technological breakthroughs such as batteries.

Enterprise resilience is one of the important capabilities of enterprises to respond to external crises, and how to improve corporate resilience and promote the steady and healthy development of the economy has become an important issue worthy of attention. Based on this, the A-share listed companies in Shanghai and Shenzhen from 2013 to 2022 was taken as a research sample to empirically test the impact of the asset-light operation model on the resilience of enterprises, and the impact of property rights on the relationship between the two. The empirical results show that the asset-light operation model positively affects the resilience of enterprises, and the property rights will weaken the positive correlation between the two.

Considering the effect of the separation between the supporting layer and the base layer of the ballastless railway caused by foundation settlement, a simplified method was proposed for calculating the rail deformation of the ballastless railway to tunnelling underneath. Firstly, the track slab and the supporting layer were supposed as a composite elastic beam, and a simplified equation for the deformation of ballastless railway composite beams induced by shield tunneling was proposed by ignoring the influence of fasteners on the composite beam deformation. Afterwards, the composite beam was divided into a void zone and a joint zone, and the analytical solutions for the deformations of the composite beams caused by tunnlling underneath were proposed based on the elastic foundation beam theory. Furthmore, the rail was regarded as an Euler beam connecting with the composite beam by the dispersed spring, and the equations for the rail deformation caused by the composite beam deformation were derived. Based on the above, compared with the numerical simulation and theoretical results in the existing literature, the proposed simplified method of the ballastless railway caused by tunneling underneath was validated. Finally, the influences of model parameters on the rail deformation to tunnelling underneath were discussed, including the tunnelling induced ground loss rate, the composite beam bending stiffness, the fastener stiffness, and the rail bending stiffness. The results indicate that the theoretical calculation results were overestimated by neglecting the local suspension effect of the supporting layer. Reducing the tunnelling induced ground loss rate, strengthening the composite beams and rails can control the rail deformation of the ballastless railway caused by tunnlling undercrossing, but strengthening the fasteners stiffness may increase the unevenness of rail deformation.

Promoting industrial ecologicalization is an inevitable choice for achieving sustainable development. Grounded theory was applied to analyze the ecological structure of the prefabricated construction industry, the mature ecological structure system of the industry was delved into. A four-dimensional industrial ecological structure framework of “resource environment ecological culture application execution management control” was constructed. The connotation of mature ecology in the prefabricated construction industry was defined. Comprehensive characterization of the mature ecological structure system of the prefabricated construction industry. By analyzing the case, an industrial ecological model was established and optimization strategies were provided to verify the accuracy of the system. Reference on how to achieve greater benefits in various aspects through ecological transformation in the prefabricated construction industry is proposed.

Selecting Yangquan City in Shanxi Province as the research region, three evaluation indexes were set, including road network density, road service index and traffic accessibility, which are statistically, analytically and computationally calculated by ArcGIS 10.8.Road Buffer Analysis and Tourism Resource Richness Index were used to evaluate the factors influencing the development of tourism in Yangquan City with the possibility of its realization in the future. The path of realizing the new development pattern in Yangquan City was analyzed. Finally, it is concluded that the transportation accessibility of Yangquan City varies greatly from county to county. Urban areas and mining areas have high transportation accessibility, suburban areas and Pingding County are average, and Yuxian County has poor transportation accessibility.The distribution of tourist attractions of Grade A and above in Yangquan City is characterized by distribution with the topography, and the distribution of tourist attractions in the suburban areas, Yuxian County and Pingding County is more balanced, with stronger transportation accessibility. Targeted recommendations is upgrade the great pressure low-grade roads to national or provincial highways, strengthen the road transportation capacity, expand the scope of road services.According to the characteristics of different districts and counties for targeted construction, the landscape protection and development of tourism-friendly Pingding County area, the traffic gateway to Yu County for the expansion of the road and the construction of the accelerated connection with Beijing-Tianjin-Hebei and the Xiong’an New Area.Multifaceted stimulation of domestic demand, the improvement of the economic structure, and then the good accessibility of transportation. improve the economic structure, and then feedback the good economic growth to the environment, forming a good cycle; seize the opportunity of the times, give full play to the great potential of Yangquan City, and build a new pattern of rural revitalization and development.

Underground diaphragm wall has great advantages in the application of deep foundation pit support in the basement of high-rise buildings, subway stations and other projects. However, for the construction of underground diaphragm wall under the complex geological conditions of soft upper and hard lower strata and high groundwater level, as well as the complex environmental conditions such as high support rate into rock, near the construction and adjacent to the operation range of subway, there are some problems such as easy to collapse holes, low trough efficiency and high construction cost. Therefore, the construction technology of pile-diaphragm wall integration supporting the foundation pit was studied. By replacing this part of the deep ground connection wall embedded in the breezed rock layer with cast-in piles, the difficulty and workload of hard rock troughs are reduced, and the safety risks of adjacent buildings and subway operations are reduced.

A flexible sorting system for industrial intelligent robots based on machine vision has been designed, focusing on identifying and sorting plastic shell samples of remote controllers. The system uses a CMOS camera and adaptive lens, combined with a white light strip source, to ensure high-precision image capture. Through camera calibration and hand eye calibration, the robot has achieved precise positioning of the workpiece position. The system software design includes visual software settings and industrial robot software design, realizing the automation process of workpiece recognition, positioning, grasping, and placement. The results show that the system can efficiently and accurately complete sorting tasks, with high automation, intelligence, and flexibility.