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The Impact of the Digital Economy on the High-Quality Development of Green Marketing in China's Manufacturing Industry: Applications of the Spatial Durbin Model

Li Jing, Shen Yan, Sun Lili, Sun Tao

Rocznik Ochrona Środowiska

2024

Tom 26

449--464

The digital economy provides China's manufacturing industry with a pathway to establish new national competitive advantages and is an essential driving force for the high-quality advancement of green marketing. Utilizing data from 30 Chinese provinces from 2013 to 2022, this study employs the spatial Durbin model to investigate the spatial relationship between the digital economy and the advancement of green marketing at a high quality. The findings indicate that the growth of the digital economy significantly fosters high-quality development in green marketing and exhibits positive spatial spillover effects on neighboring regions. The Application of spatial Durbin regression to multi-province areas has revealed that the more economically developed the region, significantly influences of the digital economy on the high-quality development of green marketing, with a local siphoning phenomenon currently visible in the eastern region. The western region exhibits a spatially positive spillover effect from the high-quality development of green marketing in other regions. Furthermore, developing the digital economy in neighboring regions significantly enhances the high-quality development of green marketing in this region. The findings remain stable when evaluated using the alternative variables method and the control fixed effects approach.

Complete f-moment convergence for arrays of random variables and its applications in semiparametric and EV regression models

He Yongping, Shen Yan, Wang Rui, Wang Xuejun

Probability and Mathematical Statistics

2024

Vol. 44, Fasc. 1

87--118

We study the complete f-moment convergence for arrays of rowwise random variables satisfying a Rosenthal type moment inequality, and then establish general results on the complete moment convergence and complete convergence for partial sums and weighted sums of arrays of rowwise random variables. As applications, we further describe the statistical properties of complete f-moment convergence in both semiparametric regression models and simple linear errors-in-variables models. The asymptotic properties for estimators are established. We also provide some simulations to verify the validity of the theoretical results.

Influence of stress wave incident angles on spalling failure in rock-mortar composites: experimental and simulation study

Bai Yunfan, Wang Shiming, Shen Yan, Wang Jiaqi, Wu Qiuhong, Zhou Jian, Li Chuanqi

Archives of Civil and Mechanical Engineering

2024

Vol. 24, no. 2

art. no. e104, 2024

This paper aims to reveal the influence of stress wave incidents at different angles on surrounding rock and supporting mortar. The split Hopkinson pressure bar device with a diameter of 50 mm was used to carry out the spall failure test of rock-mortar composite specimens under the incident stress wave at the angel of 30°, 45°, 60°, and 90°, and the spall failure process of the specimens was recorded by a high-speed camera. The test results show that the incident angle of the stress wave is an important factor in determining the initial spalling position and spalling strength. Oblique incidence increases the number of reflections of the stress wave in mortar resulting in the stress state of mortar being different. Under the same impact conditions, with the decrease of the incident angle, the distance between the initial spalling position and the free end of the specimen increases, and the maximum initial spalling position is obtained at the incident angle of 30°. The incident angle is positively correlated with the specimen spalling strength, and the maximum spall strength is obtained at the incident angle of 90°. In addition, the simulation results provided by Particle Flow Code were in good agreement with the test results. The simulation reflects that the spalling failure degree is affected by the incident angle of the stress wave, and the number of spalling layers of the specimens increases with the increase of the oblique incident angle. This paper can provide a reference for the excavation support design of underground engineering.