The upgrading of export product quality propels the manufacturing industry to transition from a cost advantage to a quality advantage, facilitating the transformation of the trade model from quantity growth to a balance of quality and efficiency, and accelerating China’s progress towards becoming a trade power. The internal mechanism of service industry openness on the quality of manufacturing export products from the perspectives of the business environment and technological innovation was explored. Empirical analysis shows that for every 1% increase in the level of service industry openness, the quality of manufacturing export products improves by 0.373%, primarily attributed to the improvement of the business environment and technological innovation spillovers. Furthermore, the level of factor marketization also influences this relationship, exhibiting nonlinear characteristics. The enhancing effect of service industry openness on export product quality can only be fully exerted when the marketization of labor, capital and technological factors surpasses a certain threshold.

Land is the basis for villagers to carry out production and maintain their survival, and the mode of production and operation of agricultural land is the first and foremost manifestation of land use. Adequate scale operation of land is a major change in the mode of rural management, the key to crack the problem of agricultural development in China, and an effective way to increase farmers’ income and achieve rural revitalization through sustainable agricultural development. Therefore, CiteSpace software was used to sort out and the literature on moderate-scale land management was quantitatively analyzed to show the current status and future trends of research in the field of moderate-scale management of agricultural land. The focus of the future research on land management on an appropriate scale can be summarized as follows: expanding the research field, broadening the research perspective, improving the evaluation standards and research methods of agricultural land management on an appropriate scale, and carrying out spatial and temporal analysis of agricultural land management on an appropriate scale. This paper reviews the literature related to land scale management with a view to informing future research on land scale adequacy.

At present, heavy metal pollution mainly composed of cadmium(Cd), lead(Pb), zinc(Zn), etc. is becoming increasingly severe, which greatly endangers the development of industry and agriculture and the health of people’s lives. Composite heavy metal ion pollution is the main form of pollution in industrial and agricultural production, and research on the remediation of composite heavy metal contaminated soil has practical significance. In addition, there is relatively little research on the use of acetic acid for the remediation of composite heavy metal contaminated kaolin, and its intrinsic remediation mechanism and reaction mechanism still need to be elucidated. In view of this, taking indoor simulated cadmium lead zinc composite polluted kaolin as the research object, electric remediation technology was adopted and different concentrations of acetic acid solution were used to remediate the composite heavy metal polluted kaolin. Combined with various testing methods, the internal remediation mechanism of polluted soil in the electric remediation process was deeply explored by analyzing the changes in electroosmotic flow, pH, conductivity, residual heavy metal ion and current.

In the context of globalization, the development of new quality productivity provides an important opportunity to enhance the innovation ability of enterprises and promote the internationalization of technical standards. Based on the theory of diffusion of innovation, a theoretical model of the impact of new quality productivity on the internationalization of technical standards was constructed, taking Chinese A-share manufacturing companies listed in 2010—2023 as the research sample. The empirical test finds that the enhancement of new quality productivity significantly contributes to the internationalization of enterprises’ technical standards. Global innovation network embedding plays a mediating role in it. It suggests that firms can accelerate the globalization of technology standards through cooperation and interaction with international innovation agents. This study reveals the influence path of new quality productivity to promote the internationalization of technical standards through global innovation network embeddedness, which further expands the application scope of innovation diffusion theory. Scientific guidance for enterprises is provided to promote the internationalization of technical standards, and is helpful to give full play to the intrinsic potential of new productivity.

On the basis of constructing an evaluation index system for energy consumption and green development level, the entropy method, coupling coordination degree model, Dagum Gini coefficient and its decomposition were used to calculate the coupling coordination level of energy consumption and green development in 30 provinces(due to the lack of data, the statistical data mentioned here do not include the Tibet Autonomous Region, the Hong Kong Special Administrative Region, the Macao Special Administrative Region and Taiwan Province) of China from 2006 to 2021, and the regional differences in coupling coordination level among different regions were analyzed in depth. Research shows that the overall level of coupling and coordination between energy consumption and green development in China is on the rise, but the western region leads in energy consumption, while the eastern region leads in green development.The coupling coordination level between energy consumption and green development shows an increasing trend, with the overall level shifting from low coordination to moderate coordination, presenting a situation of “high in the east and low in the middle and west”. The overall difference in the coupling coordination between energy consumption and green development in the four major regions of East, Central, West and Northeast China is gradually narrowing, and the main source of the difference is regional differences. Reference is provided for promoting the deep integration of energy consumption and green development, and achieving the “dual carbon” goal.

In order to evaluate the development status of cities and their impact on economic growth, combined with the five new development concepts of innovation, coordination, green, openness and sharing, the evaluation index system of urban high-quality development was constructed, the indicators were screened by OLS least squares method, the impact of high-quality urban development on economic growth and the prediction effect the explored by deep learning method, and the prediction results and accuracy of the multivariate LSTM neural network model and the improved multivariate LSTM neural network model were compared. The results show that the multivariate LSTM neural network model with attention mechanism has better prediction effect, the root mean square error RMSE of the model is reduced by 25%, and the coefficient of determination R² reaches 0.9856.

The construction forms of overlapping sections of shield tunnels are complicated, so it is urgent to investigate the response rules of existing buildings to the disturbance of tunnel construction, so as to reduce the potential construction risks. In this paper, the finite element method was used to simulate the influence of mud-water shield machine on the existing building foundation when the superimposed shield tunnel was driven. First, the down tunnel was excavated, then the up tunnel was excavated, and the concrete influence of this sequence on the stability of the foundation was studied. The simulation results are compared with the field monitoring data to verify the reliability of the model. The results show that the foundation bottom continues to settle when the tunnel is excavated. When the tunnel is excavated, the settlement of the foundation slows down and a slight uplift occurs. After the completion of the ascending tunnel, the settlement at the bottom of the foundation presents a linear distribution. In addition, the vertical load increases on the basis of the main influence of the stacked tunnel under the existing buildings, which makes the lining stress and deformation increase. The research results will provide design and reference value for cascade tunnel engineering.

A comprehensive evaluation index system was developed for assessing the intelligent innovation capabilities of enterprises, integrating data from A-share listed companies and artificial intelligence policies spanning 2010 to 2022.Employing a multi-period difference-in-differences(DID) approach, the effects and mechanisms were investigated through which artificial intelligence policies enhanced enterprise intelligent innovation capabilities. The findings indicate that these policies facilitate improvements in such capabilities by optimizing resource allocation and signaling positively via three primary channels, which are alleviating financing constraints, augmenting research and development investments, and fostering talent aggregation. Notably, the impact is more pronounced among firms located in eastern regions as well as those classified as SRDI, manufacturing, or information technology enterprises. The conclusions drawn from this research offer significant insights for industrial policy formulation and strategies aimed at bolstering enterprise-level intelligent innovation.

With the rapid development of urban infrastructure, shield tunneling has emerged as a key method in modern rail transit construction, inevitably affecting adjacent buildings and structures. Employing FLAC3D numerical simulation method, the entire construction process of shield tunnels passing beneath drainage culverts were simulated. The main focus of this study lied in analyzing the deformation pattern changes at monitoring points during the shield construction and investigating the specific impact of tunnel construction on drainage culvert structures. The findings reveal that the deformation stability of drainage culvert structures remains within a safe range during shield construction, thus providing theoretical support and reference data for similar projects in the future.

In order to make enterprises more scientific and comprehensive when choosing photovoltaic investment projects, a comprehensive investment evaluation index system was established from the environment, economy and risk and a combination of empowerment-TOPSIS model investment decision-making method for photovoltaic projects was proposed. Game theory is used to combine the subjective and objective weights calculated by the order relationship analysis method and entropy weighting method, which take into account the subjective judgment of experts and also integrates the results of objective data analysis to make the decision more comprehensive and scientific. In the investment decision-making stage, TOPSIS is adopted to calculate the overall degree of superiority, and the alternative projects are ranked in order of superiority and inferiority, so as to select the optimal investment object. Finally, the applicability and feasibility of the model are verified with examples, a theoretical basis is provided for the sustainable development of the photovoltaic industry.