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.

In the construction of underground line reconstruction, pavement deformation has characteristics such as uncertainty and complexity. Therefore, the grey model was used to establish a prediction model for pavement deformation, and engineering examples were combined to verify its good accuracy. Given that the grey model can only predict the overall trend in deformation prediction and cannot reflect the volatility of prediction errors, prediction errors were processed to determine the upper and lower limit values of grey prediction, endowing the model with a certain prediction interval and changing the point prediction form. According to the intersection position of the deformation control line and the upper and lower limit curves of grey, the safety state of pavement deformation was divided to more reasonably judge the construction safety and provide reference for related projects.

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.

According to the risk assessment guidelines of DNV, an internationally recognized risk assessment agency, there is a 50% risk of injury and death from sustained exposure within 15 minutes at a CO₂ concentration of 10%. Carbon dioxide is a “non-flammable and non-toxic gas”, which belongs to Class 2.2 dangerous goods and is an asphyxiating gas. For safety reasons, such as CO₂ pumps and compressors, special care should be taken to avoid a two-phase flow zone between the suction section and the compression/pumping section. Based on the uniqueness of CO₂ medium and its pipeline, the safety technology system of supercritical CO₂ pipeline and its related engineering solutions in foreign countries were studied, the characteristics and technical status of CO₂ pipeline transportation in foreign countries from two aspects of operation and guarantee were summarized, in order to provide guidance for the safe operation of domestic supercritical CO₂ pipeline.

Most of the conventional topographic map drawing methods adopt the principle of tilt photography real scene 3D model, which is more suitable for land area survey and drawing. The application effect in the water area topographic map drawing is poor, the plane error of the topographic map is large, and the drawing accuracy is low. Based on this, a new rendering method was proposed by introducing the principle of digital aerial photogrammetry. Firstly, digital aerial photography parameters was designed, including ground sampling distance(GSD), altitude, and image overlap. Then, image control points was set up and global navigation satellite system real time kinematic(GNSS-RTK) technology was used to measure the coordinates of the image control points. On this basis, the digital aerial photogrammetry technology was used to obtain the plane and elevation elements of the topographic map respectively, and then the topographic map was drawn. The experimental results show that the new method is highly feasible, its plane mean square error is small, the maximum is not more than 0.091 m, and the accuracy of topographic map drawing is high.

Aiming at the complex geographical conditions of the mountainous rivers flowing through the region, which leads to the difficulty of the control measurement of waterway improvement, combined with the implementation of the control measurement of waterway improvement in Zigong section of Tuo River, the layout of control points analysis, selection of coordinate systems, and selection of methods for plane and elevation control measurement were conducted. Based on the characteristics of mountainous waterways, the optimal method for layout and measurement of plane coordinate systems is proposed. The research results can provide important references and inspirations for the subsequent control measurement of long river channel regulation in mountainous areas, which will promote the smooth implementation of long river channel regulation in mountainous areas.

In order to accurately evaluate the operation safety level of civil aviation transportation airport apron, the evaluation index system was established based on “man-machine-environment-management”, the evaluation index system was verified by using the structural equation model, and the entropy weight method was used to carry out subject-objective assignment. The combination of assignment was conducted based on the game theory, so as to put forward the transportation airport apron safety evaluation model based on the SEM(structural equation model)-entropy weight method and the extension cloud model. Chengdu Shuangliu Airport was used as an example for verification, and the results show that the apron operation safety level of this transportation airport is good, which is in line with the actual operation situation, and the evaluation model can provide a scientific and feasible reference method for the evaluation of the apron operation safety of civil aviation transportation airports.

In order to improve the accuracy and efficiency of land and resources mapping, a rapid land and resources image mosaic method based on UAV remote sensing information was proposed. Firstly, by estimating the height and angle of aerial photography, the land and resources mapping images with high accuracy were obtained. Then, the corresponding feature detection algorithm combined with BRIEF (binary robust independent elementary features)algorithm was used to describe the feature rotation invariance. Next, KNN (K-nearest neighbor) algorithm was used to match feature points to achieve precise extraction. Finally, the SPHP (shape-preserving half-projective warps for image stitching)algorithm was used for image fusion, and the image mosaic is completed. The experimental results show that the designed land and resources image rapid splicing method can realize accurate mapping of land and resources, ensure the mapping efficiency, and has certain application value.

The causes and future trends of water level variations in Qinghai Lake against the backdrop of climate warming was discussed. Drawing upon meteorological observation data spanning from 1960 to 2023, the impacts of climate warming on key factors within the Qinghai Lake basin was analyzed, including evaporation, runoff, precipitation, and maximum soil frost depth. Employing Bigaussian nonlinear fitting, the water level trends of Qinghai Lake from 2025 to 2035 is predicted. Key findings reveal that as climate warming intensifies, the soil evaporation near Qinghai Lake has increased significantly, and it is the most significantly affected by climate warming (with a Pearson correlation coefficient of 0.860). Meanwhile, both runoff and precipitation have shown a slow upward trend, while the maximum soil freezing depth has declined. For now, the volume of water consumed by evaporation is less than the total volume of water injected into Qinghai Lake by runoff, precipitation, and permafrost melting. Consequently, this has led to a continuous rise in the water level of Qinghai Lake. Through Bigaussian nonlinear fitting, it is predicted that the water level of Qinghai Lake will continue to rise slowly from 2025 to 2035, reaching 3 198.133 meters by 2035. This research provides a scientific basis for ensuring the safe operation of trains on the Qinghai-Tibet Railway’s section surrounding the lake.

Land-use change is an important part of global change and has a profound impact on the value of ecosystem services. Based on the land use data of 2010,2015 and 2020 in Dingbian County of Yulin City, the time and space was analyzed, the change of ecosystem service value was evaluated by equivalent factor method, and the spatial distribution characteristics was studied by Arcgis spatial analysis. The results show that the main land types in Dingbian County are cultivated land and grassland, in which the area of cultivated land and grassland is continuously decreasing, and the area of water area and construction land is increasing, and the degree of change of single land use type is shown as follows: water> construction land> wetland> grassland> woodland> cultivated land>unused land. ESV(ecosystem service value) from 2010 to 2020,2020 increased by 181 million yuan over 2010, in which the ESV increment of water is more significant, and the ESV of cultivated land and grassland decreases more. From the perspective of individual ESV, climate regulation and hydrological regulation are mainly used.

In order to ensure the efficient development and safe operation of deep water gas field and fully release the production capacity of each well area, the integrated steady-state model of “wellbore-wellhead-manifold-platform” was established. Based on the production plan, the research was carried out from the aspects of production verification, hydrate prevention and control, slug analysis and liquid carrying analysis. The results show that there are hydrate production risks in the whole life cycle in the east and west production routes. The maximum hydrate sub-cooling degree in the production route is less than -5 ℃ by optimizing the MEG injection amount in each well. The platform temperature of eastern and western logistics is -2.4~9 ℃, and the platform pressure is 1.3~11 MPa.The research results can provide technical guidance for the effective development of similar deep water gas fields in the future.

In this paper, the anti-invasion performance of the perimeter wall between the test pressures of the completion tool is analyzed. According to the conditions of the downhole tool pressure test such as test medium, test temperature, test pressure, and the possibility of dislodging the parts during the test, a combination of three types of perimeter wall structures is proposed: single steel plate, double steel plate + timber interlayer, and double steel plate + concrete interlayer. To meet the test pressure requirements, the three types of perimeter wall structure combinations are analyzed to determine more conservative structural dimensions by means of finite element simulation calculations and analyses, and the results of the analysis from the simulation of the Combination 1 structure are verified by means of the impact test.

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 standards and processes of third-party testing and consulting services was optimized by summarizing and analyzing the shortcomings,the measures that need be improved and on-site feedback and other comprehensive elements that exist during the work period. The work standards was further optimize and implemented, benchmark was conducted to find deficiencies and make up for them. Finally, based on the optimized and improved work standards, constructive rectification suggestions and standard requirements are proposed from inspection ideas to results display, while providing feedback on issues, violation clauses are listed. This innovative mode can not only effectively help rectify the hidden dangers on the project site, but also achieve the effect of point-to-point technical disclosure, thus reflecting the professional services and progressiveness management of third-party testing.

With the rapid construction and development of comprehensive transportation hubs, the air-rail intermodal transportation model has brought more convenience to passengers’ travel. Accurately understanding the air-rail intermodal passenger flow is crucial for improving the overall transportation service quality and ensuring transportation safety. A two-stage model combining particle swarm optimization-random forest model (PSO-RF) and Logit model is used to predict the passenger flow of travel paths in the context of air-rail intermodal transportation between urban agglomerations. Take one-way “Shifting from Railways to Aviation” as an example. In the first stage, the average daily civil aviation passenger flow of travel routes was predicted based on historical data by PSO-RF model. In the second stage, a behavioral survey was conducted through the airport outbound passengers to analyze the characteristics of passengers’ transfer mode and choice behavior. Then, a Binary Logit model of passenger travel choices was constructed based on the disaggregate theory, and the high-speed rail transfer sharing rate was calculated. Finally, the results of the two-stage model were combined to calculate the travel route passenger flow forecasts. The effectiveness and feasibility of the proposed method by constructing a case study from Shanghai to Chengdu neighboring urban agglomeration were validated. The results indicate that the accuracy of the two-stage model reaches 80.40%.

On the basis of the actual structure of the linear hydraulic shock absorber of the medium and low speed maglev vehicle, the AMESim simulation model of the linear hydraulic shock absorber was established and verified. The maximum simulation error of the established hydraulic shock absorber simulation model is only 8.6%, and the reliability is high. Combined with the model of hydraulic shock absorber and maglev vehicle structure, the co-simulation model of shock absorber and vehicle system was established. From the perspective of dynamic optimization design, the installation quantity and layout position of lateral shock absorber were designed, and the influence of different installation modes of lateral shock absorber on the stability of maglev vehicle was discussed. The dynamic calculation results show that the installation modes of lateral shock absorber has little effect on the vertical stability of maglev vehicle.When 8 lateral shock absorbers are installed on the suspension frame of a single car, the vehicle stability is the best. When the suspension frame of a single car is equipped with 4 lateral shock absorbers, the vehicle’s ride stability performances takes the second place. When the lateral shock absorber is not installed, the lateral ride stability performances of the measuring points at the end of the vehicle exceeds the excellent limit.

Digital image processing technology and finite element simulation software based on ABAQUS were adopted to analyze the cracking damage and related influencing factors of asphalt mixture at the meso level. At the same time, zero-thickness cohesive force units were inserted at the asphalt mortar and aggregate-mortar interface to conduct finite element simulation of asphalt mixture SCB(semi-circular bending) test and analyze the cracking process of asphalt mixture at the meso level. The effects of pre-cut depth, specimen thickness and support distance on the cracking characteristics of asphalt mixture were investigated by using the load-displacement curve and fracture energy obtained from the cracking of the specimen. The results show that the deeper the prefabricated incision and the smaller the thickness of the specimen, the worse the anti-cracking performance of the specimen, and the anti-cracking performance increases first and then decreases with the increase of the distance between the supports. The anti-cracking performance of the specimen is the best when the distance between the supports is 80 mm.

The finite-element model was used to simulate the double I-steel and concrete composite beam bridge with a span of 4×35 meters in the approach bridge outside the dike of Shouchun Huaihe River Bridge.The results indicate that the impact factor of the steel beam increases with speed and then decreases, reaching a maximum at 60 km/h. In contrast, the impact factor of the bridge deck continues to rise with speed, exceeding the design value of the standard local impact factor by 91.67% at 120 km/h. Both the steel main beam and the bridge deck’s impact factors decrease with the increase in vehicle weight. Specific trends in the variation of impact coefficients with vehicle speed and weight are identified, the limitations of existing bridge design codes in accurately describing the actual dynamic response to vehicle loading is revealed, the importance of considering local dynamic effects in bridge design and evaluation is emphasized.

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.

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.

As a backup means of radar control, procedural control plays an important role in case of radar failure. It is very important for controllers to master procedural control skills. To this end, a Python-based procedural control conflict detection and deployment auxiliary teaching system was designed and implemented. Firstly, a seven-layer architecture is designed, covering the user layer, presentation layer, business layer, model layer, data layer, operating system layer and hardware layer. Then, five core modules are constructed: interactive interface module, data preprocessing module, conflict detection module, dynamic conflict display module and conflict deployment module, and the functions and implementation technologies of each module are designed in detail. Finally, taking the actual teaching scenario of Wuhan Nanhu Airport approach control airspace as an example, Python was used to simulate and verify the system. Students can use the system to automatically detect conflict types and propose conflict solutions, so as to better master conflict deployment skills.

Due to the excessive mining and the lack of perfect and suitable mine restoration measures, some villages in Xintai area have coal goaf and karst collapse area. Through field investigation and public opinion survey, GIS(geographic information system)technology and Origin comprehensive three types of eight evaluation factors were used to evaluate the mine geological environment. With the engineering rock group stratigraphic lithology as the base map for the evaluation of the geological environment of Xintai major coal mining and hollowing township geological environment grade mapping, the results show that the mine environment in Xintai area is average. According to the evaluation results, targeted restoration and ecological management can be carried out in Xintai area according to the township as a unit. After using GIS and Origin and synergy matrixcalculation methods to evaluate the mine environment of each township in Xintai area, it is found that the mine geological environment quality of Wennan Town is relatively the worst, and the evaluation grade is poor, while the results of other township grades are average. Mine ecological restoration and land ecological utilization are important environmental protection measures, and it is recommended to restore the mine environment, organize land and carry out urban planning through vegetation restoration and greening, soil improvement and conservation, rational use of water resources, protection of biodiversity, land reuse and comprehensive development, and structural gradient restoration.The research method can be applied to the geological environment assessment of other mines.

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.

In order to reveal the main innovation subjects and technology leaders in the global industry, and provide guidance for China’s industrial policy formulation and enterprise technological innovation strategy, a seven-dimensional patent analysis framework was proposed to analyze the technological development trend of amorphous alloy industry based on the study of patent data. Through patent search and statistical data, the development trend of amorphous alloy patent applications, innovation regions, flow distribution, innovation subjects, innovation categories and innovation hotspots were identified. It is found that the number of patent applications for amorphous alloys has shown a downward trend in recent years, especially in Asia.

As China enters the middle stage of industrialization and modernization, both energy consumption and carbon emissions are growing, posing an increasingly serious challenge to sustainable development. The industrial sector is a major source of carbon emissions, and its structural optimization is crucial for reducing carbon emission intensity. Based on a sample of 30 provinces in China from 2005 to 2021, a dynamic panel threshold regression model was applied to treat provincial cooperation as a threshold value, and the mechanism of industrial structure optimization on carbon emission intensity was explored from two dimensions: rationalization and advancement of industrial structure. The results show that the rationalization and upgrading of the industrial structure have a significant negative impact on carbon emission intensity. However, the rationalization of industrial structure has a significant three-threshold effect on carbon emission intensity, and this negative effect shows a “V” type change trend on the whole. The upgrading of industrial structure has a single threshold effect on carbon emission intensity. The upgrading of the industrial structure will significantly promote the reduction of carbon emission intensity only when the provincial cooperation index is at least 2.013. The government should actively establish a cross-provincial cooperation mechanism to foster the coordinated development of inter-provincial industries and facilitate the extensive sharing of clean energy technologies, thereby promoting the transformation of the economy towards a green and low-carbon future.

The synergy of industry stakeholders is crucial to the high-quality development of prefabricated building, but there are many stakeholders with different interests and fields of specialization during the whole life span. Based on the industrial ecological perspective, the social network analysis method was adopted to study the relationship network from three aspects, including identifying the stakeholders, clarifying the relationship, and analyzing the network structure. The study shows that the decision-making, construction and demolition phases are high-density networks with close stakeholders synergy, the design phase has loose network relationships and the most unstable structure. The developer in the decision-making stage, the construction unit in the construction stage, the demolition unit in the demolition stage has the highest degree of centrality, dominating the synergy of the stakeholders. As a result, it is proposed to optimize the network structure to promote sustainable development.

The research results and trends of China’s recreational behavior in the CNKI(Chinese National Knowledge Infrastructure) database from 1994 to 2024 were analyzed by using CiteSpace. The results demonstrate that the number of articles published has undergone three distinct phases: the “budding period,” the “rapid growth period,” and the “fluctuating growth period.” The research results are grouped into three primary categories: recreational behavior and its influencing factors, utilization of recreational resources and protection and development, and the behavior of open space. The key topics in this field are recreational behavior, the elderly, open space, and urban parks. The research hotspots in this field are open space, leisure behavior, the elderly, open space, and urban parks. The research trends in this field are pocket parks, optimization strategies, landscape gardening, and parks and green spaces. In the future, it is suggested to deepen the theoretical system, improve the application of new technology and methods, and explore new perspectives of research.

: China’s meat and sheep industry has a prominent position in the world. In order to clarify the current development history and research frontiers of China’s meat and sheep industry, the high-quality literature in the China Knowledge (CNKI) and Web of Science (WoS) databases from 1994—2024 was taking as the data base, and the knowledge of China’s meat and sheep industry in terms of the number of publications, authors, journals and institutions, and keywords were analyzed by using CiteSpace, its main characteristics, research hotspots and new trends were explored. The results show that meat sheep industry research gradually emerged after 2014, and the relevant research is mostly concentrated in agricultural colleges and universities, mainly in the direction of animal husbandry and animal medicine, and there is a certain scale of cooperation mechanism among scholars. The literature focuses on development countermeasures, breeding scale and profitability, the literature focuses on product quality and nutrition regulation. In the future, domestic and international research on meat sheep industry should continue to enhance the research heat, enrich the research methodology, promote multidisciplinary cross-fertilization, and help realize the high-quality development of the industry under the dual drive of scientific and technological innovation and green development.

High-quality development of rural tourism is an important tool for promoting rural revitalization. By analyzing 112 cases of poverty reduction in rural tourism, using theoretical coding and network text analysis to conduct relevant research and data revelation,the problems, measures taken, achievements and successes in the development of rural tourism in China were analyzed. On this basis, the strategies are proposed, including grasping the key of talents, promoting the integration of capitals, advancing the development of products, constructing the marketing pattern, improving the quality management, and building and sharing with hosts and guests, in order to provide certain reference for cracking the development dilemma of rural tourism, helping to promote the strategy of rural revitalization, and guiding the high-quality development of rural tourism.

At present, the story of ‘a drama with a fire and a city’ is constantly staged. In the deep integration of film and television and cultural tourism, will the popular drama stimulate the audience’s willingness to travel ? According to the SOR(stimulus-organism-response) theory, the research model of the influence of the hit drama on the audience’s willingness to travel was constructed, and the empirical research was carried out by using the structural equation structure. The results show that the content quality of the hit drama, program evaluation, empathy experience and sense of meaning of the program have a positive and significant impact on the audience’s willingness to travel. Audience program evaluation, empathy experience and program sense of meaning have a partial parallel mediating effect between the content quality of the hit drama and the willingness to travel. Based on this, suggestions for tourism destinations are proposed to enhance new media marketing represented by hot dramas.

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.

Engineering projects are the core body of cooperation among countries along the “Belt and Road”. Mainly considering the environmental factor index, a national project construction cooperation factor evaluation system constructed, including 5 first-level indexes, 10 second-level indexes and 27 specific indexes. Using the relevant data from 2019 to 2023, entropy weight method and TOPSIS (technique for order preference by similarity to ideal solution) were used to quantitatively evaluate the degree of cooperation and its influencing factors in 64 countries and regions along the route. The results show that nine three-level indicators, such as the degree of government integrity, the legal perfection of GDP, and commercial convenience, have a significant impact on national engineering construction cooperation. There are obvious polarization and regional differences in the level of project construction cooperation among countries along the route.On the whole, the level of project construction cooperation in the “Belt and Road” countries has gradually improved.

Under the requirements of high-quality development and regional coordination, the construction of the “Belt and Road” Initiative in southwest China not only needs to consider the radiation capacity of the policy center city, but also needs to focus on its impact on the surrounding areas. Based on the panel data of 13 central cities of the “Belt and Road” in Southwest China from 2014 to 2021, using the economic radiation model under Fourier’s law, the economic radiation capacity of the central city was measured based on the growth pole theory, center-periphery theory and industrial gradient theory. Based on this, considering the moderating effect of industrial isomorphism and the stage characteristics of the radiation effect, the high-dimensional fixed-effect model and threshold regression model were used to empirically analyze the economic radiation effect of the central city, and further verify it through the “U” test. The results show that the “siphon” and “feedback” effects of the economic radiation of the central cities of the “Belt and Road” in Southwest China exist at the same time and show phased characteristics with different economic radiation intensities, but the long-term performance is “feedback” effect, which is strengthened by industrial isomorphism, indicating that the implementation of the “Belt and Road” policy has a significant role in promoting the development of Southwest China.

Low-carbon evaluation is a process of comprehensively assessing the environmental behavior and performance of enterprises, which helps to shape their positive environmental image and enhance their sense of social responsibility. In the context of low carbon economy, enterprise performance assessment involves not only quantitative indicators but also qualitative indicators. By constructing a hybrid multi-attribute performance evaluation index system, the uncertainty data of non-quantitative indicators of low-carbon enterprises were evaluated by trapezoidal fuzzy numbers, and the fuzzy entropy weighting method was used to determine the weights of the indicators, and then the multi-criteria weighted aggregation method was used to calculate the comprehensive performance evaluation value of the enterprise. Finally, the enterprise’s low-carbon development level can be ranked according to the fuzzy credibilistic mean and variance of performance.

Taking the companies listed on the Shenzhen Stock Exchange from 2018 to 2022 as research objects, a two-way fixed-effects model was constructed to explore the relationship between IBF, quality of information disclosure and enterprise innovation efficiency through empirical analysis, and the main research hypotheses were tested for robustness. It is found that the implementation of IBF can significantly enhance the innovation efficiency of enterprises, and the quality of information disclosure plays a partial mediating role between IBF and enterprise innovation efficiency. The study provides a new perspective for understanding the association mechanism between IBF and enterprise innovation efficiency, which is of theoretical and practical significance for promoting enterprise innovation development.

Based on the perspective of green innovation, the impact of management equity incentive on green innovation of listed companies in heavily polluting industries in Shanghai and Shenzhen A-shares from 2006 to 2022 was empirically tested. The research shows that the management stock incentive plan promotes the green innovation of heavy polluting enterprises, and the conclusion is still reliable after using instrumental variables to mitigate the endogeneity and other robustness tests. Mechanism analysis shows that management equity incentive can promote green innovation output by easing financing constraints and increasing R&D investment. Heterogeneity analysis shows that there is no significant difference between the property rights nature and incentive model, and the effect of equity incentive is more significant when the enterprise is in the growth stage and the decline stage.

Based on the theoretical framework of “technology-organization-environment”, the influencing factors of innovation performance improvement of new energy enterprises were constructed. Taking 141 listed new energy enterprises as samples, fuzzy set qualitative comparative analysis method was used to explore the configuration path of innovation performance improvement of new energy enterprises. The results indicate that R&D capability, innovation resources, innovation consciousness of senior management team, firm scale, market competition and government support are not independent influences but the results of multi-factor synergies. Three configuration paths to improve the innovation performance of new energy enterprises are the “technology-environment” logic and “technology-organization-environment” logic led by the consequent innovation path, and the “organization-environment” logic led by the potential innovation path. There is a complementary and substitutive relationship among innovation resources, R&D capabilities and executive team innovation consciousness, and R&D capabilities have a more significant impact on the innovation performance of new energy enterprises than innovation resources.

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.

The proximity between the subjects of construction projects is an important factor that affects the performance of cooperative innovation. Based on the theory of multidimensional proximity, the longitudinal data of the cooperative innovation among Chinese project participants was collected to explore the influence mechanism of geographical, organizational, technological, institutional and relationship proximity on the cooperative innovation performance of construction enterprises. In order to better reveal the statistical and aggregate relationship between variables, negative binomial regression and fuzzy set qualitative comparative analysis(fsQCA) were used to analyze the binary relationship of cooperative innovation of 392 construction enterprises. The results show that geographical proximity, organizational proximity, institutional proximity, technological proximity and relationship proximity all significantly promote the cooperative innovation performance of construction enterprises. The antecedent configuration of high cooperative innovation performance of three types of construction enterprises is obtained by qualitative comparison and analysis, namely, “organizational leadership-resource integration” type, “system traction-cross-domain breakthrough” type and “technology coordination-collaborative creation” type.

How to promote the green development of rubber enterprises has attracted much attention from the industry, and digital technology provides an opportunity for its green transformation. While, there is still a lack of theoretical research on why digital technology can promote the green transformation of rubber enterprises. Based on multiple case analysis and dynamic capability theory, the internal mechanism of digital empowerment of green transformation of rubber enterprises under different strategic development stages was analyzed. It is found that the green development of rubber enterprises can be divided into three stages: green infrastructure, green advantage shaping and green development leading. At each stage, under the guidance of green strategy, rubber enterprises promote value chain reconstruction through digital empowerment, and thus improve the green dynamic ability of enterprises.

Cultivating new drivers of the press and publishing industry, implementing the strategy of driving the press and publishing industry projects, and improving the quality and efficiency of enterprises with innovation elements are the logical path for the production and operation, scientific and technological innovation and management practice of listed press and publishing enterprises. Taking some publication listed companies as the research object, the enterprise management performance evaluation index system was built from the perspective of operating efficiency, financial efficiency, cost efficiency, growth ability and risk level. The comprehensive evaluation and analysis of press and publication listed companies’ business performance from 2018 to 2023 was conducted, in order to provide reference for the enterprises to realize depth transformation and upgrading, several intellectualization breakthrough and factor innovation configuration.

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.

From the perspective of ESG(environmental, social, and governance), enterprise value creation integrates economic, social, and environmental values. Corporate value creation was measured from three aspects of economic, social, and environmental. There is a positive correlation between ESG performance and corporate value creation. Corporate reputation plays an intermediary role.The quality of internal control has a positive moderating effect on the relationship between ESG performance and corporate value creation. The positive relationship between ESG performance and corporate value creation is more significant in samples of non-state-owned enterprises, enterprises with strong innovation capabilities, high media attention, and high industry competition.

Based on the development of the digital economy and the uncertainty of demand information in the equipment manufacturing supply chain, the impact of government subsidies on the information sharing strategy under the equipment manufacturers quality innovation was explored. The price and quality innovation decision models for non information sharing and information sharing were established and solved, and the model results were analyzed. Results show that retailers sharing optimistic demand can definitely motivate equipment manufacturers to improve product quality, but it may not necessarily increase wholesale and retail prices at the same time. Moreover, it is only when government subsidies are high that it helps to increase the actual demand for products. Equipment manufacturers always benefit from information sharing, and designing an information compensation mechanism can increase the motivation for retailers to share, but this mechanism requires government subsidies to be within a certain range. In addition, the increase in government subsidies helps to enhance the consumer surplus value and social welfare value of information sharing.

New quality productivity encompasses technological innovation, industrial transformation, green development, and social structure optimization, becoming a key driving factor for enhancing the quality of new urbanization. An evaluation index system for new quality productivity and new urbanization was constructed, and the entropy weight method was used to measure their development levels. Through empirical methods such as the fixed effects model, Dagum Gini coefficient method, and mediation effect analysis, the impact mechanism of new quality productivity on new urbanization was systematically analyzed. It is found that new quality productivity has a significant positive effect on new urbanization, with notable regional heterogeneity: the promotion effect is most significant in the Northeast, followed by the East, and relatively weaker in the Central and Western regions. The contribution of inter-regional differences to the impact of new quality productivity on new urbanization is greater than that of intra-regional differences, and the overall Gini index and inter-regional differences show an upward trend. New quality productivity indirectly promotes the process of new urbanization through the development of the financial industry. Based on the above research results, relevant countermeasures and suggestions are put forward to accelerate the construction of new urbanization.

With the frequent occurrence of public health emergencies and the increasing aging of society, the risk of public health emergencies in aging communities is also increasing, which brings great impact to the elderly group. In order to ensure the health and safety of the elderly population and the sustainable development of the aging community, a scientific, efficient, comprehensive and sustainable strategy for the aging community to cope with public health emergencies was provided. According to the three pillars of “health” “participation” and “security” in the framework of active aging, the aging community’s response to public health emergencies was analyzed, and the PDCA(plan-do-check action cycle) optimization framework for coping strategies of public health emergencies in aging communities was constructed from the perspective of active aging, and the corresponding optimization path is proposed accordingly. The PDCA cycle was integrated into the whole process of aging community response to public health emergencies, and it is constantly evaluated and optimized.

Based on the 2016 China Labor-force Dynamic Survey, the effect of appearance on residents’ subjective well-being and the acquired factors of education and effort were empirically examined. The result shows that better appearance can help improve residents’ subjective well-being; mechanism analysis shows that appearance affect residents’ subjective well-being by influencing job satisfaction (income satisfaction and promotion satisfaction) and life satisfaction (life choice and social network); improving the degree of education and effort helps to reduce the impact of appearance on residents’ subjective well-being. The conclusions provide new empirical evidence for the relationship between appearance and well-being, and provide new ideas based on the perspective of education and effort for residents to alleviate the “inequality” caused by their natural appearance.

Lowering carbon emissions from tourism transportation is an important way to achieve the “dual carbon” goals. Based on spatial autocorrelation theory and the spatial Durbin model, a study was conducted on the spatiotemporal evolution and spatial spillover effects of carbon emissions from tourism transportation nationwide. The results indicate that from 2012 to 2020, the GDP of the tourism industry showed a good overall spatial autocorrelation, with industrial structure, green travel rate, and urbanization rate being the most influential factors on carbon intensity in tourism transportation. In terms of spatial spillover effects, there is a strong negative correlation between regional economic development levels and green travel rates with carbon emissions, while the spillover effects of urbanization rate show a contrary direct effect, demonstrating a positive effect, which indicates that the carbon reduction achieved with the increase in urbanization level has a marginal effect. Factors such as regional economic levels and advancements in environmental technology are also important means of reducing carbon intensity in tourism.

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.

New farmers play a crucial role in enriching the forms of agricultural industry, leading farmers to get rich and promoting the integration of industry and village. To address the problems such as unbalanced input-output and unstable cooperative relations between the government and new farmers, an evolutionary game model of government and new farmer was constructs to study the evolutionary path of strategy selection between the two sides, and the factors affecting the decision-making of both sides by using numerical simulation were analyzed. The results show that the evolutionary stability strategy is influenced by costs, additional benefits, indirect losses and subsidies. The higher the costs, the faster the evolution of behavioral strategies into non-participation to assist in rural revitalization. The increase of additional gains, indirect losses and subsidies contributes to supporting rural revitalization of both sides, when one party participates in rural revitalization while the other party does not, the behavior of the participating one will be invalid.

Science and technology finance ecosystem realizes the efficient connection between science and technology resources and financial resources, which can effectively optimize the allocation of funds, and ensure funds flow into the real economy. Deeply grasping the unique advantages of science and technology finance ecosystem to promote regional economy coordinated development is helpful to gradually narrow regional differences and achieve coordinated economic development. Based on the provincial panel data of China from 2012 to 2021, the index system was constructed to measure of science and technology finance ecosystem and the level of regional economy coordinated development. On this basis, the impact of science and technology finance ecosystem on regional economy coordinated development was tested. The results show that the science and technology finance ecosystem can significantly promote the coordinated development of the region and has regional heterogeneity among the eastern, central, western and northeastern regions. According to the research results, suggestions are proposed from three aspects, including improving the overall arrangement of science and technology finance ecosystem, introducing incentive policies, and attracting high-level talents.