To address the fatigue issues at the connection between legs and spudcans of jack-up platforms during oilfield production operations, a local finite element model of the spudcan was established. By considering wave loads from eight different directions and employing the spectral fatigue method, the fatigue life at the leg-spudcan connection was calculated. Additionally, the influence of spudcan-surrounding soil on the fatigue life of the connection was investigated. Results indicate that, under a 10-fold safety factor, the fatigue life at the leg-spudcan connection meets design requirements. Incorporating the effect of surrounding soil further improves the fatigue life at this critical joint.

Energy price is a key market signal, and their fluctuations have profound impact on national economic development and business operations. To accurately predict future price trends and master cutting-edge energy price forecasting models, a systematic review of relevant research was conducted. First, the distinction between in-sample fitting and out-of-sample prediction was clarified. Second, traditional econometric forecasting models was summarized. Finally, advanced artificial intelligence models was organized from the perspectives of input variables, forecasting methods, and forecasting frameworks. Based on the research review and current trends, there are two future directions worth attention: first, the use of integrated feature selection methods to construct stable feature subsets, and second, the introduction of mixed-frequency methods to improve the accuracy of real-time predictions.

Based on the panel data of provinces from 2011 to 2021, the relationship between digital economy and urban-rural income gap was explored. It is found that the impact of digital economy on the income gap between urban and rural residents has a significant “U”-shaped feature, and this impact has regional heterogeneity. It is obvious in the eastern and central regions, while in the western region, the development of digital economy helps to reduce the income gap between urban and rural residents. In addition, tax revenue plays a positive regulatory role in the “U”-shaped impact of the digital economy on the income gap between urban and rural residents, delaying the expansion of the income gap. The conclusion points out how policy makers should formulate and adjust policies in different regions to promote the balanced development of social economy by using the development of digital economy.

Through in-depth analysis of the three dimensions of input, output and development environment, the evaluation index system of integrated development of culture and tourism in the five provinces in northwest China was constructed, and the level of integrated development of culture and tourism in the five provinces from 2011 to 2021 was measured. The weight of each index was used to determine the combination assignment. The results show that the integrated development of the cultural and tourism industry in the five northwestern provinces is less synchronised and mostly dominated by cultural lag. In addition, there is no equivalence between the integrated development of culture and tourism industry and regional economic level and resource abundance, and the overall development level is not high. On the whole, most of the integrated development level of culture and tourism in northwest China is unbalanced, the allocation of factor resources still needs to be adjusted, and the industrial structure needs to be transformed. Therefore, in order to promote the prosperous development of cultural undertakings and tourism in northwest China, it is necessary to taken more effective measures to improve the integrated development level of culture and tourism.

In order to explore the mechanical characteristics of shield tunnels passing through different soft-hard uneven strata, a three-dimensional refined shield tunnel numerical model considering the contact effect of ring longitudinal bolt joints and segment-soil was established, and its feasibility were verified by comparing the measured data. Then, aiming at the complex ground conditions of upper soft-lower hard, upper hard-lower soft, and longitudinal soft-hard uneven strata, the influence of different strata composite ratios on the internal force, convergence deformation and vertical settlement of shield segment structure was deeply explored. The results show that with the increase of strata composite ratio, the bending moment of tunnel bottom in upper soft-lower hard strata decreases greatly, the vertical settlement of segment increases slowly and then rapidly, and the convergence deformation of segment increases linearly. Compared with the upper soft-lower hard strata, the vertical settlement response of shield segment in the upper hard-lower soft strata is more sensitive under the same composite ratio. When the tunnel lies in the longitudinal soft-hard uneven strata, the extreme value and extreme difference of the longitudinal bending moment of the segment and the shear force increase with the increase of the strata composite ratio. The convergence deformation of the segment is larger on the hard soil side than on the soft soil side.

The formation mechanism of the spatial pattern of tourism complexes in Sanya City was discussed under the dual drive of capital and resources. By in-depth analysis of the roles of various factors such as fixed capital investment, resource endowment, market driving and government promotion, their impacts on the spatial pattern of tourism complexes in Sanya City were discussed. It is found that although fixed capital investment and resource endowment have no significant direct impact on the spatial pattern of tourism complexes, they indirectly exert an impact through their effects on physical space and social and cultural space. Market driving and government promotion have a negative regulatory effect in this process. Market driving may lead to investment biased towards short-term interests, and if government promotion is improperly planned, it will also affect the rational allocation of resources. Further research shows that strengthening market mechanisms and optimizing government functions are crucial for promoting the scientific and reasonable formation of the spatial pattern of tourism complexes in Sanya City.

Taking the listed companies of Shanghai and Shenzhen A-shares from 2013 to 2022 as samples, the impact of supply chain finance on corporate financial risks was verified through empirical research. The moderating effect of digital transformation on the above relationship was explored, and the mechanism and path through which supply chain finance affects financial risks was analyzed. The results show that supply chain finance can significantly reduce corporate financial risks,this reducing effect is more significant among small enterprises, high-tech enterprises and those in the manufacturing industry, digital transformation has a significant positive moderating effect on the above relationship, and the impact mechanism indicates that financing constraints have a significant mediating effect.

As a crucial hydraulic engineering structure, the impermeability of a rockfill dam directly affects the safety of the project, environmental protection, and economic benefits. Different protective measures are taken for cofferdams under different conditions, so a detailed analysis based on specific conditions is necessary. Focusing on the transverse soil and rock revetment upstream of Phase I of the Yanzhou hub, the large-scale finite element software GeoStudio was used to conduct an in-depth analysis of its various anti-seepage structural forms, aiming to evaluate the effectiveness and seepage control effects of each anti-seepage scheme.The research findings indicate that both the absence of anti-seepage measures and the sole use of geomembrane structures fail to meet the engineering requirements for seepage prevention. Although a single anti-seepage wall structure can meet the requirements, it is not the best choice due to its high construction difficulty and economic cost. In contrast, the anti-seepage solution combining high-pressure jet grouting with composite geomembrane can effectively fulfill the project’s seepage prevention needs, which provides practical guidance and suggestions for the design of earth-rock cofferdam.

In order to study the mechanical properties of Changxin epoxy binder used in Yangjiang Port Bridge, its performance under tensile strength, tensile strength, shear strength and other conditions were evaluated through a series of experimental and theoretical analyses. The research includes the preparation process of binder, mechanical property testing, failure analysis and performance comparison with Japan TAF epoxy binder. The results show that Changxin epoxy binder exhibits excellent mechanical properties and stability in steel bridge deck pavement, which provides a strong guarantee for the long-term use of Yangjiang Port Bridge.

The report of the 20th National Congress of the Communist Party of China put forward the integrated deployment and overall arrangement of education, science and technology, and talents for the first time. Using bibliometrics and policy text analysis, the evolution characteristics of education, science and technology, and talent policies from the perspectives of document changes, type distribution, and document issuing departments and theme evolution were summarized, their development trends were analyze. Suggestions are put forward to ensure the standardization of policy processes, strengthen the integration of education, science and technology, and talent policies, and ensure the timeliness of policy innovation.