Hidden danger investigation is a crucial method for ensuring the safety of air traffic control, and the graded assessment of hidden dangers serves as an important basis for their management. Focusing on the hidden dangers associated with air traffic control, a grading model was established based on cloud theory grounded in expert evaluations. In response to the relatively coarse categorization provided by existing regulations regarding hidden dangers, a more precise evaluation framework was developed to enhance the accuracy of assessments. To improve the reliability of these evaluations, a group decision-making approach involving experts was employed for assessing hidden danger levels. Furthermore, to enhance the objectivity of the evaluation process, a cloud model was introduced for quantitative assessment alongside qualitative analyses. Finally, an illustrative example was presented to demonstrate the evaluation procedure. The research findings indicate that the cloud model-based approach exhibits strong feasibility and applicability.

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.

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.

A new type of five degree of freedom hybrid robot(5-DOF) was designed to address the stability issue of aerospace drilling that could not be met by existing parallel robots. The robot integrates the advantages of parallel mechanisms and existing rotary heads, consisting of three Special PurposeUnit(SPU) branches and one Passive Unit(PU) branch, with a unique mechanism layout and stable structural support. Through kinematic analysis of the parallel mechanism and 5-DOF(5-Degrees of Freedom) rotor, as well as position inverse analysis of the hybrid robot, the superiority of the robot in terms of motion performance is verified, providing useful reference for improving robot performance.

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.

Basing on the relevant indicator data of Fujian Province from 2008 to 2022, the comprehensive development level of cultural and tourism industries was measured. The coupling coordination model was used to explore the evolutionary characteristics of the coupling coordination degree between the two industries. The results show that the coupling and coordination status between the cultural industry and tourism industry in Fujian Province has entered a stage of high-quality coordination from severe imbalance, but it is still in the intermediate coordination stage at present. The obstacles are manifested as the lag of the tourism industry in the early times, afterward as the lag of the cultural industry, and now the lag of the tourism industry. In view of this, suggestions are proposed to establish a cooperation platform for cultural and tourism entities, and to utilize tourism projects for financing innovation, in order to promote the high-quality coupled development of the cultural and tourism industry.

In order to sort out the current research status, stage hotspots and development trend of rural education digitization in China, an in-depth analysis of the high-quality literature included in the China Knowledge Network database in the past 20 years with the help of CiteSpace software was conducted. It is found that: firstly, the research on digitalization of rural education can be divided into four stages, namely initial exploration, rapid growth, steady development and rapid growth; secondly, the researchers have not yet formed a close research cooperation network; thirdly, there is a lack of a single research methodology and multidisciplinary perspectives; fourthly, the research has gradually shifted from a focus on localised rural development to a balanced urban-rural education. Looking to the future, it is necessary to strengthen the construction of the research team and establish an academic research community, expand research perspectives and promote the diversification of research paradigms, and broaden the scope of research and refine the content of research.

In order to deeply analyze the current status and trends of electric vertical take-off and landing(eVTOL) aircraft, and reveal the correlation between technological innovation and market demand, the “Incopat” patent database was used to retrieve patent data related to the field of eVTOL aircraft published globally from 2000 to the present. After noise reduction, cleaning and other processing of the retrieved results, a final sample of 2 794 patent data points was determined for analysis. The patent information in the field of eVTOL aircraft was studied from aspects including application trends, layout in major countries, patent technology distribution and analysis of major applicants. It is found that eVTOL aircraft, as an emerging technology field, are experiencing rapid growth in patent application activities globally. The United States leads in technological innovation and patent layout within this field. China still lags behind the United States in the realm of eVTOL aircraft, but it is currently a major source of innovation and a potential industrial base in the market, developing rapidly and poised to become a new leader. Europe, Japan and South Korea are actively making layouts, reflecting a trend of globalized development in this field. Regions such as Shanghai, Jiangsu and Beijing have already emerged as hubs of innovation, while central and western provinces represent future growth areas. However, there is a lack of involvement from relevant research institutes. It is recommended that relevant entities strengthen deep integration and collaborative innovation globally to promote the development of this emerging technology.

The ecologicalization of prefabricated building industry plays an important role in promoting the coordinated development of industrial entities and the diversified transformation of industrial value. Through the analysis of the prefabricated building industry ecosystem, the industrial ecological symbiotic evolution model was established using the Logistic equation, and the growth curve of the model was simulated and fitted using Matlab software. Finally, a case analysis was conducted on the innovation ecosystem of the prefabricated building industry in Changsha. The results show that the symbiotic effect coefficient between each subject reflects the degree of interdependence and the closeness of the cooperative relationship between different subjects. The mutualistic symbiotic evolution model can give full play to the synergy between subjects, and targeted policies are put forward for the symbiotic evolution of the system, providing a reference for the symbiotic development of the prefabricated building industry.

Taking 398 CSSCI literature on ecological governance research in China from 1998 to 2020 by China National Knowledge Infrastructure(CNKI) as the research object, the CiteSpace tool was used to visually analyze the literature characteristics and research hotspots in this field, systematically sort out and explore the hot frontiers and development trends in this field. Research has found that the current average annual publication volume in this field has reached 30 articles, which is the research hotspot with the rapid development in the academic community; The research in this field takes the Chinese Academy of Sciences as the core, and maintains close cooperation with universities or research institutions such as Tianjin University, the Environmental Planning Institute of the Ministry of Ecological Environment and the University of the Chinese Academy of Sciences, forming a relatively wide range of research cooperation groups and some typical institutional cooperation groups. The majority of author collaborations in this field are in groups of 2~4, but a relatively stable core author group has not yet been formed. The research in this field focuses on “ecological environment” as the core hotspot, and the emergence intensity of “environmental governance” “collaborative governance” “restoration governance” and “environmental pollution”is relatively high. Environmental restoration and environmental pollution are the main entry points in this field. The overall trend of research frontiers is from single to comprehensive development, and the hot topics of research include problem analysis and evaluation measurement, exploration of governance measures, and collaborative governance research. The collaborative governance of multiple regional entities and the collaborative governance of regional ecological environment are two important aspects of future research in this field.