Wenshan Prefecture has unique natural and cultural tourism resources. It is of great significance to clarify the spatial distribution characteristics and influencing factors of A-level tourist attractions in Wenshan Prefecture for promoting global tourism and optimizing the spatial layout of local tourism. Taking Wenshan Prefecture as an example, the spatial distribution characteristics of A-level tourist attractions in Wenshan Prefecture was analyzed by using the nearest neighbor index and nuclear density analysis methods based on ArcGIS platform, and tries to explore the factors affecting the distribution of tourist attractions. The results show that in terms of spatial distribution, the A-level tourist attractions in Wenshan Prefecture are more in the north than in the south, and less in the east than in the west. It is concentrated in low-lying areas with an altitude of 1 000~2 000 m. The nearest proximity index is R=0.710 187 and R<1, indicating that the point elements of A-level scenic spots tend to condense and distribute, and Puzhehei Scenic spot is the core area of 5A scenic spots. The geographical detector explains that the spatial differentiation of A-level tourist attractions in Wenshan Prefecture is most influenced by rivers and topography. The interactive detection results show that the spatial differentiation of A-level tourist attractions in Wenshan Prefecture is influenced by multiple factors, which play A synergistic role in enhancing the spatial layout of the scenic spots.

In order to effectively activate the dormant assets of oil fields, the abandoned oil and gas wells are transformed into coaxial cased heat exchangers to extract geothermal energy and realise the successive development of energy, taking a shut-down oil well in Dingbian County, Shaanbei as the study example, the borehole heat exchanger module of the open-source software OpenGeoSys was used to study its heat exchange performance. Effects of different circulation flow rates, inner tube diameters of heat exchanger, power of heat exchanger, and seasonal heat extraction cycles on the performance of the transformed well are analyzed. Results show that when the heat exchange power is fixed, a flow rate of 15 m³/h can both obtain a higher outlet water temperature and ensure a long-term stable operation of the heat exchanger, using different diameters, variation of water temperature at the outlet end of the inner tube is only 0.17 ℃. For every additional 50 W of heat exchange power per meter, the outlet water temperature at the end of the heating season decreases by about 17.55 ℃, with an average decrease of 0.35 ℃/W. When the heat exchange power is constant, for every one additional month of a heating season, the annual minimum outlet temperature decreases by about 1 ℃, when the heating season is 4, 5, 6, 7, 8 months, the time required for the outlet temperature to reach a quasi-steady state during the heating season is 15, 18, 21, 24, 27 years, respectively. In order to improve the heat exchange performance of the geothermal well, it is recommended that a seasonal cycle of 5 months of heat extraction and 7 months of well shutdown in Ordos Basin Area should be used, with a circulation flow rate of 15 m³/h and a heat exchange power of 100 W.

Born in the context of digitalization, digital trade is an emerging trade model, which is based on digital technology and transformed through the digitization of trade methods or trade objects.Digital trade in solving the time and space limitations at the same time also led to the emergence of digital trade barriers, which has become a major obstacle in the process of economic globalization. Reducing digital trade barriers and promoting the synergistic development of the global digital economy are of great significance to optimizing the global value chain and enhancing the efficiency of international trade. Focusing on the relationship between digital trade barriers and global value chains, relevant theoretical models were built based on previous research, the development trend of China’s digital trade under the background of “anti-globalization” was discussed, and corresponding countermeasures are put forward to address these issues.

Configuring distributed synchronous condensers in renewable energy collector stations is a viable approach to mitigating transient overvoltage at grid connection points. Traditional distributed synchronous condenser’s location and capacity selection strategies are mostly based on fixed output scenarios of renewable energy, ignoring the randomness of wind and solar power output at each node, making it difficult to ensure the effectiveness and adaptability of the strategy. In view of this, the maximum grid connected power of renewable energy based on confidence intervals was estimated. A multiple renewable energy stations short circuit ratio index that takes into account the randomness of renewable energy is proposed to quantitatively evaluate the voltage support strength of each node in the power grid. Based on this, a distributed synchronous condensers location and capacity determination strategy is formulated. Simulation results demonstrate that the proposed strategy can accurately ide.jpgy nodes with weaker voltage support capabilities under actual fluctuations of renewable energy outputs. Compared to conventional strategies, it proves more effective in suppressing transient overvoltage in the sending-end system, offering technical support for large-scale renewable energy integration into power grids.

Under the background of the construction of the digital twin Yellow River, the applicability of various intelligent devices as the basic components of the three-dimensional monitoring and perception system of the digital twin Yellow River, namely the integrated intelligent monitoring and perception system of “outerspace- sky-ground- water”(OSSGW) was studied. Using the device end as the target layer, a feature index layer was established to evaluate the cost-effectiveness and applicability of the device. The feature index layer includes three secondary evaluation dimensions, namely performance, economy, and usability, with a total of eight index factors. Six levels of index factor assignment criteria were established, and an index layer assignment matrix was created. Then, the entropy method is used to calculate the weights of each index factor, and the TOPSIS(technique for order preference by similarity to ideal solution) method was used for comprehensive applicability calculation to obtain the scheme layer, providing decision support for equipment selection.

In recent years, the medical radioisotope industry has been developing rapidly, the total amount of medical radioactive articles transported in China has increased, and the regulatory authorities have paid more attention to the safe transportation work. The national regulatory requirements and the current status of the use of type A package for the transportation of Class II radioactive articles for medical use in China, the design requirements and precautions for the package, the analytical demonstration and experimental verification of the package, as well as the approval of the design and manufacturing record were introduced. Some suggestions are put forward based on the current problems, hoping that the containers for the transportation of medical radioactive articles become more standardized, unified and safe, and promote the high-quality development of the medical radioisotope industry.

Digitalization and greening are the two major trends of the new round of scie.jpgic and technological revolution and industrial change, and they are also two epochal characteristics of the new quality productivity. Based on the panel data of A-share listed companies in Shanghai and Shenzhen from 2012 to 2022, how digital transformation of enterprises empowers green innovation was studied. It is found that there is a significant promotion effect of digital transformation of enterprises on green innovation, which is more obvious for state-owned enterprises, low-financing enterprises, high-technology enterprises, non-resource city enterprises, enterprises in heavy pollution industry, and large-scale enterprises. The results of the mechanism of action suggest that digital technology can improve green innovation capacity by enhancing the transparency of corporate information and increasing R&D investment.

Based on the complex network method to build the 2001—2021 global copper trade network to describe its evolution characteristics, QAP(quadratic assignment problem) analysis was used to explore the impact of factors.It is found that the global copper trade network has a small-world character, and in part, Germany, China, the United States and Italy are the core nodes, in terms of influencing factors, the proximity of countries and the gap of economic development level will promote the copper trade significantly, and the larger the geographical and institutional distance will restrain the copper trade, the index of economic freedom, population and use of the same language will not have a significant impact. In view of this, it is suggested to strengthen cooperation with neighboring regions, increase R&D investment in technological innovation, and ensure the security and stability of China’s copper supply chain.

In order to find out the deformation law of roadway under the support of large deformation fiberglass bolt, a three-dimensional calculation model was established by using numerical simulation software, and the support effect of conventional fiberglass bolt and large deformation fiberglass bolt was compared and analyzed. The results show that when the goaf of the working face is squared for the first time and squared for the second time, the roadway shows a trend of inward contraction, and the plastic zone is mainly concentrated around the roadway. The horizontal displacement of the mining side and the settlement of the roof show a trend of gradually decreasing and then tending to be stable. When the goaf is first and second square, within the monitoring range, the maximum horizontal displacement of the mining side has reached the breaking displacement of the conventional FRP anchor rod, but it has not reached the breaking displacement of the large deformation FRP anchor rod. The conventional FRP anchor rod does not meet the support requirements, and the large deformation FRP anchor rod meets the support requirements.

Based on the data of the 11 provinces in the Yangtze River Economic Belt from 2014 to 2022, the development levels of digital logistics and economic resilience were measured. The relationship between the two was analyzed using coupling coordination degree, spatial autocorrelation, and grey relational degree. The research shows that the comprehensive development index of economic resilience is higher than that of digital logistics, but the gap between them is narrowing. As a whole, the degree of coupling coordination has been increasing year by year, and there is a positive spatial correlation. From the perspective of driving factors, the proportion of added value of the tertiary industry has the greatest impact on its coupling coordination degree, and the smallest is the number of internet broadband access. Therefore, it is necessary to promote the coordinated development of digital logistics and economic resilience.