CiteSpace was used to visually analyze the hot frontiers and development trends of research on the coordination of science, technology, economy, and ecology in China’s CNKI journal literature. The distribution of institutional and author collaborations, co-occurrence and emergence analysis of hot keywords, as well as hot topics were systematically sort out. It is found that there has been a significant increase in relevant literature after 2015, forming a core author group, but no representative university institutions have been formed. The research hot keywords include “economic growth”“environmental regulation”“technological innovation”“ecological environment” and “coordinated development”, and the hot keywords are interrelated and nested. The research topics can be summarized from four levels, including economy, innovation, coordination, and green.

Taking the No.1 tunnel of an irrigation district as the engineering background, the waterproofing design principle of “blocking water and limiting drainage” was adopted to explore the influencing factors of external water pressure under the composite lining condition of isotropic shallow buried tunnels. A simplified model of composite lining was established to analyze and derive the analytical solution of the variation in external water pressure and seepage volume in relation to the surrounding rock's permeability, grouting layer, lining permeability and head. At the same time, the Midas finite element software was used to calculate the water pressure and seepage volume under different conditions to verify the reasonableness of the analytical solution. The study shows that the permeability and thickness of the grouting ring have a greater influence on the water pressure and seepage volume outside the lining, and the construction of the grouting ring should be emphasized. With the increase of the depth of the drainage hole into the rock, the water pressure outside the tunnel lining gradually decreases. Therefore, in the environment of high groundwater head, setting drainage holes on the tunnel is the best effective measure to reduce the external water pressure.

With the acceleration of the global digital process, the digital business environment has become an important area to enhance national competitiveness. By using CiteSpace to biblimeasure and analyze 175 articles published on Chinese National Knowledge Infrastructure(CNKI) from 2013 to 2024, the research progress and trend of China’s digital business environment were explored. The research results show that the digital business environment can be divided into three stages, including desert, emergence and growth period. The research focus is on the development of digital government, digital trade, finance and other specific application fields. The application of digital technology, digital transformation of government service and policy support are closely related to its development.

In view of the centralized construction of pile foundation or large-scale excavation of foundation pit in rainstorm and typhoon weather, a technology for purification, treatment and recycling of construction sludge and wastewater is proposed. An integrated purification treatment device was used to form a sludge and wastewater treatment system that integrates sedimentation, purification and recycling. Flocculants, polyacrylamide, polyaluminum chloride were used to mix, mix and react with the sewage after three-stage sedimentation, so that the sewage solid-liquid can be separated into mud and clean water. Clear water can be recycled for on-site construction, car washing, watering and dust reduction, etc., achieving the effect of green economy, high efficiency and environmental protection, greatly improving the image of on-site civilized construction, and obtaining significant benefits.

Referencing the relevant technical specifications of the International Civil Aviation Organization (ICAO), the current state of airspace usage and flight procedures naming in China was analyzed. A new approach to flight procedures design and naming is proposed. This approach introduces the concept of transition+common segment (point) and integrates parallel runways with arrival and departure paths, significantly reducing the number of flight procedures and aeronautical charts, thereby improving airspace utilization efficiency. Using Chengdu Shuangliu Airport as an example, the application of the transition + common segment (point) concept at this airport was analyzed, demonstrating its effectiveness in reducing the number of flight procedures, simplifying aeronautical charts, and easing the burden on air traffic management.

Regarding the increasing number of IoT devices and the trend towards miniaturization, which require high concurrent transmission performance and low energy consumption, an improved MAC(media access control) layer CSMA/CA(carrier sense multiple access with collision avoidance) protocol design is proposed based on physical layer MIMO(multiple input multiple output) technology. It simplifies the complexity of executing the CSMA/CA protocol on terminals and employs MIMO to achieve concurrent access for multiple terminals through cross-layer design, and allows terminal devices to easily and conveniently access the network system. An analysis of the throughput performance of the proposed protocol was presented, and its effectiveness and the accuracy of the theoretical analysis were verified through simulation, which not only provides a theoretical supplement to the redesign of the CSMA/CA protocol but also offers practical guidance for engineering applications.

The development model and strategy of Jiangxi’s animation industry in the context of the digital economy was explored, and a game model involving the government, animation enterprises, and the public was constructed using the evolutionary game theory. It is found that the level of the government’s digital technology investment and the local policy support significantly affect the strategy choices of each entity. The transformation cost of enterprises is crucial to their strategy, and low transformation costs and high innovation returns can increase the probability of digital innovation. The improvement of the digital literacy of the public has a significant impact on their participation behavior. Finally, a simulation analysis was conducted using MATLAB R2021a. Corresponding policy recommendations are put forward to promote the high-quality development of Jiangxi’s animation industry in the context of the digital economy.

In order to solve the problem that the dynamic control performance of permanent magnet synchronous motor is poor when PI(proportional-integral) control strategy is used in vector control, and the motor parameters are easily affected by changes in external temperature and load, which leads to poor precision and responsiveness of the control motor, a model predictive control method is proposed to control the motor. This strategy uses the system model to predict the future input and state of the system, and directly calculates the control input by optimizing the objective function, which significantly improves the dynamic performance and steady-state accuracy. Moreover, with its strong ability to deal with nonlinearity and parameter changes, it can control the nonlinear system of permanent magnet synchronous motor well. According to the waveform diagram obtained by simulation, model predictive control is superior to PI control in dynamic response, anti-interference ability, low speed performance and robustness. Therefore, using model predictive control can effectively improve the control performance of permanent magnet synchronous motor.

Based on panel data of 266 city pairs from 2008 to 2021 in Jiangsu and Zhejiang Provinces, a Probit model was utilized to delve into the impact of intellectual property(IP) protection on corporate technology mergers and acquisitions(M&A). It is found that establishing IP courts can significantly enhance the activity in technology M&A. To ensure the robustness of our findings, interference from other policy changes was controlled. A counterfactual test and key city data exclusion method were employed, further verifying the positive role of IP court establishment in promoting corporate technology M&A activities. The findings can provide strong empirical evidence for strengthening the IP protection mechanism and stimulating the vitality of technology M&A, which is crucial for regional economic development.

Digital applications can achieve a win-win situation for economic and ecological benefits, which is particularly important for the green transformation of enterprises. Based on data from Chinese A-share listed companies from 2013 to 2022, how digital application affects corporate green innovation was explored by constructing a panel econometric model on the basis of measuring digital application indicators. Research findings indicate that digital applications are significantly positively correlated with green innovation. Under the examination of mechanism pathways, resource allocation plays a partial mediating role. After substituting key indicators, the conclusion remains valid. Enterprises should place great importance on digital applications, increase investment in research and development as well as digital infrastructure, and tap into the potential for green growth, among other things.