Carrying out study tourism in Hainan Tropical Rainforest National Park is an important measure to implement the value of ecological products in the national park, fulfill the social responsibility of environmental education, and promote the full realization of the economic, social and cultural benefits of the national park. Based on the idea of “RMP(resources, markets, products)+”, an RMPC analysis model of resources, markets, products and curricula was proposed for study tourism development in Hainan Tropical Rainforest National Park, and resource surveys and questionnaire surveys were used to investigate the resources and source markets of study tourism in Hainan Tropical Rainforest National Park. The results showed that the types of study tourism resources in Hainan Tropical Rainforest National Park were complete, and the number of study tourism resources was highly correlated with the distribution of nature reserves, and the animal and plant resources were not fully utilized. The study tourism in Hainan Tropical Rainforest National Park has a good market foundation, and it is an urgent problem to deal with the relationship between wildlife protection and tourism development.According to the survey results, a development system for study tourism in Hainan Tropical Rainforest National Park is proposed from the dimensions of product development and curriculum design, so as to empower the green rise of Hainan Tropical Rainforest National Park with tourism development.

Technological innovation, as the primary driving force for the development of China’s digital economy, plays an important role in triggering industrial transformation and giving birth to emerging industries.An empirical analysis on the mechanism and path of the impact of panel data from Chinese new energy vehicle listed companies from 2012 to 2022 were conducted. Research has found that the digital economy significantly enhances the technological innovation capability of the new energy vehicle industry. The digital economy drives innovation in state-owned new energy vehicle enterprises more strongly than in private enterprises. Compared to western cities, the digital economy has greater innovation in new energy vehicle technology in eastern cities. Therefore, in the field of new energy vehicles, fully leveraging its big data resources and information advantages is an inevitable trend to lead the development of the new energy vehicle industry.

“A new development pattern with domestic circulation as the mainstay, domestic and international circulation mutually promoting”is a clear development blue print of the current and future. In this context, the development of local traditional pillar industries are confronted with opportunities and challenges. In order to achieve the transition from quantity catch-up to quality improvement, from factor-driven to all-factor upgrading, and from industrial scale expansion to industrial structure upgrading and transformation, some path were proposed, including the establishment of regional industry alliances, the setting of local industry quality certification standards, the enhancement of product quality, the improvement of assessment and risk control, and the soft power-driven flexible coupling of high-quality development momentum.

The blueberry industry in China has experienced rapid development over the past 20 years, and the blueberry processing industry has become an important means to extend the blueberry industry chain and increase industrial added value. With the development of agricultural E-commerce, online platforms have become crucial for selling blueberry processed products. Product details and sales information for three main types of blueberry processed products on the JD platform were obtained, including blueberry jam, blueberry wine, and frozen blueberry. Through data preprocessing and analysis, the typical commodity features of these three processed products were extracted, the sales situations were compared and analyzed and the market preferences for blueberry processed products were explored. The results showed that coverage of China on imported blueberry processed products is low, and domestically products dominate in both quantity and sales volume. The blueberry jam market is stable, and the quality and market share of domestic brands have certain advantages. The unit price of products is relatively concentrated, and the packaging forms are diverse, which meets the market demand. Blueberry wine is a niche category but holds market potential. The price differences between different brands are significant, and their packaging forms and bottle capacities are mostly the same. Consumers are more inclined to purchase products with medium or low price. As for frozen blueberry, there are fewer well-known brands. Consumers prefer low-and mid-priced products, and the quality and brand of imported products are more advantageous. Finally, according to the research conclusions, some suggestions are put forward on the development of blueberry industry, in order to achieve sustainable and healthy development of blueberry industry in the future.

The Neogene loose sandstone has the characteristics of low diagenesis and poor cementation. Its structure is loose, and groundwater is easily enriched in this formation, making it the main seepage channel for groundwater. Based on the Xiangshan No.2 Tunnel, the application technology of the advanced support system of horizontal rotary jet grouting piles in the formation of mudstone interbedded with loose sandstone was systematically studied through on-site pile testing and numerical simulation. The secondary supplementary grouting technology was proposed to improve several technical deficiencies of the horizontal rotary jet grouting piles and solve the frequent problems of collapse of the face and sudden water and mud influx during the excavation process of Xiangshan No.2 Tunnel. A simplified calculation method for horizontal rotary jet grouting piles based on rod structure is proposed by refining the calculation model, which will facilitate the promotion and application of this support system.

The safety cover thickness required for TBM (tunnel boring machine)tunneling in hard rock is such that it is too large to increase the total length of the tunnel design without increasing the cost. Therefore, the study of the minimum safety cover thickness for TBM tunneling in hard rock is of great engineering significance. In light of the aforementioned considerations,the Guangzhou-Dongguan-Shenzhen Intercity Railway Xixiang Station-Bao’an Station double-mode shield tunnel project case was drawn upon to investigate the minimum safe overburden thickness of varying parameters under the condition of changing rock grades. The results indicate that when the arch displacement method is employed, if the tunnel perimeter rock class is II or III, and the thickness of soft soil is between 0 and 3 times the diameter of the tunnel, then the minimum safe rock cover thickness is between 0.2 and 1.2 times the diameter of the tunnel. When the pressure arch method is employed for simulation, if the rock cover class is II or III, and the soft soil thickness is between 1 and 3 times the tunnel diameter, the ratio of the minimum rock cover thickness to the depth of burial exhibits a tendency to increase and then decrease with the increase of the hard rock thickness,reaching a maximum value of 0.39. When the overburden grade is grade IV and the thickness of the soft soil is 1 to 3 times the diameter of the tunnel, the ratio of the minimum rock cover thickness to the depth of burial is observed to decrease with the increase of the hard rock thickness, reaching a maximum value of 0.42. The conclusions can provide engineering guidance for TBMs to safely tunnel through hard rock.

New energy vehicles have two characteristics of energy saving and environmental protection, and integrate transformative technologies in artificial intelligence, Internet, big data and other fields. They are an important strategic measure to cope with global climate change and optimize the energy structure, as well as an important engine to cultivate new quality productivity. Based on Nanjing Metropolitan Area of new energy automobile industry development present situation, SWOT(superiority, weaknesses, opportunities and threats) method was used to study the advantages, disadvantages, opportunities and threats of new energy automobile industry development in Nanjing Metropolitan Area. Specific countermeasures are put forward to realize high quality development of new energy automobile industry in Nanjing Metropolitan Area, and bring new development opportunity and kinetic energy.

Compared with the traditional national system, the new characteristics of the new national system are facing a new era background, based on a new institutional foundation,shouldering new historical tasks, and based on new development conditions. The implementation of the new national system needs to follow the complementary logic of a proactive government and an effective market,the dialectical logic of independent innovation and open innovation,the unified logic of problem orientation and free exploration, and the mutually reinforcing logic of basic research and applied research. Five key mechanisms were constructed to promote the implementation of the new national system, namely the strategic guidance policy traction mechanism,the market determined resource allocation mechanism,the continuous support mechanism for basic research,the linkage mechanism of education and technology talents,and the coordination mechanism of strategic scientific and technological forces.

Based on the reality of safety production in manufacturing enterprises and the background of industrial Internet, a tripartite evolutionary game model of industrial internet safety production supervision platform-manufacturing enterprises-government was constructed to analyze and verify the stability of the system’s evolutionary strategy. The effects of the commission coefficient paid by the manufacturing enterprises, the development and operating cost coefficient of the platform, and the amount of fines imposed by the government on the platform on the evolution results are studied. The results show that increasing the commission coefficient paid by manufacturing enterprises can improve the probability of the platform choosing a high degree of safety production supervision service level and the probability of manufacturing enterprises choosing to join the industrial Internet safety production supervision platform. Reducing the development and operating cost coefficient of the platform can improve the probability of the platform choosing a high degree of production safety supervision service level. Increasing the amount of fines imposed by the government on the platform can improve the probability of the platform choosing a high degree of production safety supervision service level, and the probability of the government choosing to actively regulate the industrial Internet production safety supervision platform.

To solve the problems of poor branching and red light strip in the track circuit of Daqin Railway, a cable transmission scheme combining axle counting technology and track circuit is proposed. The potential application of axle counting technology in solving track circuit problems was analyzed, the overall architecture of the system was designed, key modules are identified, and the system workflow was clarified; Then the key components were designed and corresponding renovation plans were proposed based on the on-site situation; Finally, overall testing on the system was conducted to verify its stability and reliability, and test results that meet expectations were obtained. This plan can provide technical reference for related circuits with issues such as poor branching and red light bands.