A multi-objective hybrid optimization algorithm framework was proposed for the vehicle routing problem with time windows (VRPTW) at airport terminals, based on genetic algorithm (GA), simulated annealing (SA) and adaptive large neighborhood search (ALNS). Aiming to minimize both vehicle dispatch costs and time window penalty costs, the impact of resource sharing at cargo centers was considered. Through the use of K-means clustering, simulated annealing for optimizing the order of site visits, and genetic algorithm for classifying freight point cargo levels, the algorithm efficiently solving the problem was achieved. Experimental results show that the algorithm reduces the total cost of the cargo center by 12.46%, demonstrating the effectiveness and practicality of the model.

Two kinds of double-hooked corrugated plate moisture separators with different draining hook structures were numerically investigated, and the gas-liquid two-phase flow model inside the corrugated plates was constructed by using computational fluid dynamics methods. The separation efficiency and pressure drop of the two corrugated plates were comparatively analyzed using the shear stress transport k-ω(SST k-ω) model and the discrete phase model(DPM) under different inlet velocity conditions. The results show that large-size droplets will be separated directly by impacting the separator wall under the effect of inertia, while small-size droplets with smaller inertia force and similar trajectory to the main stream will move with the main stream and are difficult to be captured. The draining hook structure will produce a certain amount of vortex, which will have a certain effect on the local gas flow rate of the flow field, and the main stream gas phase will bring in a portion of the droplets to increase its removal efficiency. When the inlet velocities of the SH-type and N-type corrugated plate are greater than 4 m/s and 6 m/s, respectively, the separation efficiency of the droplets with a particle size larger than 8 μm can reach 100%. When the overall separation efficiency of the two types of corrugated plates reaches 84%, the energy loss of the N-type corrugated plate is about twice as much as that of the SH-type corrugated plate. Comprehensive comparison of the pressure drop and separation efficiency of the two types of corrugated plate moisture separators with double hook, the similarities and differences in their structures, performance advantages and disadvantages were studied and analyzed.

To ensure the flight safety of the airport, on the basis of the Technical Standards for Civil Airport Flight Areas, considering the relevant definition of the obstacle and the requirements for the size and slope of the obstacle limit surface where the flight zone grade index I is 4, Auto CAD was used to draw out the airport clearance plane graphics. The files were imported into the GIS system, the allowable height of each obstacle limit surface was calculated, different obstacle restriction surfaces was constructed, the 3 D clearance model of the civil airport was established. The obstacle layer with the restricted surface layer is superimposed to make information query on the obstacles, and get which limit surface the obstacle is located and whether the limit surface is exceeded.

Taking into account the fairness concerns of influencers, the decision-making in a livestreaming e-commerce supply chain was investigated. Three decision-making models were established under different power structures to explore how influencers’ fairness concerns and variations in power structures affect the decisions and profits of supply chain members. The findings reveal that when influencers lead or both parties have equal power, the livestream price and profit of both the brand and influencer decrease as the fairness concern coefficient increases. Under equal power, as the influencer’s market expansion coefficient increases, the prices and profits of both the influencer and the brand increase. When the commission rate is high, the profits of both the brand and the influencer increase with the growth of the redirection rate. When the influencer leads, both parties achieve the highest profits.

Since 2021, China has opened its three-child policy, and the relevant supporting measures to support fertility have been continuously improved at the national and local levels. However, the number of newborns and the birth rate have not met expectations. Based on the 2021 China General Social Survey (CGSS) data, the unordered multiple classification Logistic regression model was used to explore the impact of the number of children on the labor force participation of reproductive women.The results show that the increase in the number of children will reduce the participation level of reproductive women in non-agricultural labor and increase the probability of non-participation in work. In addition, women’s age, education level, spouse’s labor participation status, spouse’s annual income, family residence, whether they live with their spouse, and family annual income all affect the labor participation status of women of childbearing age.

From the perspective of a closed-loop supply chain, the information bias related to carbon emissions from lithium-ion battery manufacturers and operational cost discrepancies among new energy vehicle manufacturers and third-party recyclers was examined by constructing a Stackelberg game model encompassing three distinct recycling modes. Through numerical examples, the behavior of information biases, individual profits and total profits across these recycling modes was analyzed. The findings indicate that both carbon emission biases and operational cost discrepancies are directly correlated with the individual profits and overall profitability of all stakeholders within the supply chain. Notably, the R/T-M mode yields the highest total profit and should be prioritized in practical applications. Furthermore, as carbon trading prices increase, there is an observable trend where profits for all parties initially decline before subsequently rising.

Adjusting industrial structure to improve regional environmental performance is an important means for the government to promote local environmental protection. Taking 30 provinces in China(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) as case studies, fuzzy set qualitative comparative analysis (fsQCA) was used to explore the impact of their configuration effects on regional environmental performance from four dimensions: industrial structure upgrading, rationalization, specialization and diversification. The findings are as follows. ①Regional environmental performance has the characteristics of “reaching the same destination”, that is, two different condition configurations can achieve high regional environmental performance. There are two driving mechanisms to achieve high regional environmental performance, namely, the industry-professionalization-oriented model and the industry-professionalization-rationalization model. ② None of the four dimensions of industrial structure can be regarded as the core condition for producing high regional environmental performance alone, but the specialization of industrial structure plays a more universal role as the key condition. It has further enriched the theoretical system of the relationship between industrial structure and environmental performance, and the research conclusions can provide decision-making reference for various regions to formulate scientific and reasonable industrial structure adjustment policies to improve regional environmental performance.

Cultural and creative industry is not only a new engine of economic growth, but also an important driving force for cultural and social development. Based on the modified spatial gravity model and social network analysis method, combined with the relevant data from 2000 to 2019, the spatial correlation and network structure evolution characteristics of China’s cultural and creative industries were studied and analyzed. The results show that the scale of China’s cultural and creative industries continues to expand, and the spatial correlation intensity increases year by year, and always presents an extreme distribution pattern of “strong in the east and weak in the west”. The core-periphery structure of China’s cultural and creative industries is obvious, with the core area more concentrated in the eastern coastal area and the fringe area mainly distributed in the western area of China. China’s cultural and creative industries have become more and more closely connected, forming a cohesive subgroup with close internal relations. The internal connections of subgroups are relatively stable, but the overall connections still have great shortcomings. There are different spillover relationships among the “main beneficiary”, “two-way spillover” and “broker” subgroups, and they play an important role in the whole network.

With the development of information technology, digital economy, as a new economic growth point, profoundly affects the global industrial layout and development direction. The connotation and measurement of industrial structure transformation and upgrading in the context of digital economy were discussed, the main dilemmas faced in the process of promoting industrial structure upgrading by digital economy was analyzed, and the main paths of digital economy-driven industrial structure upgrading was summarized, including promoting technological upgrading and innovation, strengthening financial support and deepening, optimizing the allocation of talents and resources, perfecting the policy and market guidance, as well as implementing differentiated industrial policy.

With the continuous innovation of agricultural modernization and digitalization technologies, the construction of digital agriculture has become a core topic for agricultural development. Based on the sample data of 31 provincial models(due to the lack of data, the statistical data mentioned here do not include the Hong Kong Special Administrative Region, the Macao Special Administrative Region and Taiwan Province)from 2011 to 2022 in China, the entropy weight method was used to measure the index of China’s digital agriculture construction level and an empirical analysis was conducted to verify the impact of fiscal support for agriculture on digital agriculture construction. Furthermore, the mechanism of how the agricultural technological environment affected digital agriculture construction was explored and the threshold effect of urbanization rate was examined. The study finds that fiscal support for agriculture can significantly promote the level of China’s digital agriculture construction, and this conclusion holds in various robustness tests. Moreover, the agricultural technological environment positively moderates the development of digital agriculture in China. The exploratory analysis shows that fiscal support for agriculture has a particularly significant promotion effect on the digital agriculture construction of the eastern region. The threshold effect analysis reveals the differential impact of urbanization rate on digital agriculture construction. The interactive relationship and future trend between fiscal support for agriculture and digital agriculture construction are summarized, and development suggestions of strengthening policy coordination, promoting technological innovation, and promoting deep integration of agriculture and digitalization are put forward, aiming to provide reference and guidance for the sustainable development of China’s agriculture.