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518 results on '"Wang, Xuefang"'

2. Asymptotic stability of rarefaction waves for compressible Navier-Stokes equations with relaxation

Author

Hu, Yuxi and Wang, Xuefang

Subjects
Mathematics - Analysis of PDEs
Abstract

The asymptotic stability of rarefaction wave for 1-d relaxed compressible isentropic Navier-Stokes equations is established. For initial data with different far-field values, we show that there exists a unique global in time solution. Moreover, as time goes to infinity, the obtained solutions are shown to converge uniformly to rarefaction wave solution of $p$-system with corresponding Riemann initial data. The proof is based on $L^2$ energy methods.

Published
2022

15. Study on the Innovative Application of Civil and Commercial Law in the Context of E-Commerce in the Internet Era

Author

Wang Xuefang

Subjects
e-commerce, innovation in civil and commercial law, poisson regression model, time lag effect, 68q05, Mathematics, QA1-939
Abstract

This paper focuses on the innovative application of civil and commercial law in the context of e-commerce in the Internet era, and explores how e-commerce affects the application and innovation of civil and commercial law, aiming to provide theoretical support and practical guidance for the legal environment in the era of e-commerce. A combination of theoretical Analysis and Poisson regression model is used to analyse the impact of e-commerce on civil and commercial law, and a robust regression model based on mean drift penalty is constructed for quantitative Analysis. It is found that the development of e-commerce positively impacts the effectiveness of civil and commercial law. The data show that for every unit increase in the level of e-commerce development, the efficacy of civil and commercial law increases by 0.318 points (p

Published
2024
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46. Quantum effects of gas flow in nanochannels

Author

Wang Xuefang, Dong Xianshan, Xiao Junfeng, Zhang YuYu, Xu Jianfeng, Liu Sheng, and Gao Liang

Subjects
gas flow hindrance, nanochannels, quantum mechanics, localized high pressure, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Published
2021
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49. Prevention of Cadmium Contamination by Microbial Inoculant and Its Potential Mechanism.

Author

Xu, Ximei, Yue, Xiaofeng, Wang, Du, Fang, Mengxue, Yu, Li, Ma, Fei, Yin, Nanri, Wang, Xuefang, Xu, Baocheng, Zhang, Liangxiao, and Li, Peiwu

Subjects
MICROBIAL contamination, CADMIUM, MICROBIAL inoculants, ALKALINE phosphatase, HEAVY metals, PLANT-soil relationships, AFLATOXINS
Abstract

Cadmium is the main heavy metal contaminant of food in the world. The extent of cadmium pollution in peanut in China remains unclear. To determine the cadmium pollution level in peanut, samples from the main producing regions in China were assessed. The findings revealed that the cadmium pollution level in Chinese peanuts was relatively low. Moreover, the Aflatoxin Rhizobia Couple B. amyloliquefaciens, B. laterosporu, B. mucilaginosus, E. ludwiggi (ARC-BBBE) microbial inoculants on cadmium contamination in peanut were evaluated. The fertilization methods were categorized into conventional fertilization and conventional fertilization supplemented with 60 kg/hectare of microbial inoculant ARC-BBBE as the base fertilizer. The cadmium contents in the soil and peanut plant parts were detected and analyzed. The results demonstrated that the microbial inoculant ARC-BBBE significantly reduced the total cadmium content in peanut, as well as the available cadmium and exchangeable cadmium in soil. Furthermore, the pH and urease and alkaline phosphatase activities in soil were significantly enhanced, suggesting that the microbial inoculant ARC-BBBE decreased cadmium content in soil and reduced the cadmium uptake by plants through a combination of the action of the bacteria itself and the secretion of extracellular substances. This ultimately achieves the goal of reducing the cadmium content in peanut seeds. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Modeling the importance of subsurface environmental variables in driving swordfish (Xiphias gladius) catchability in the Western Indian Ocean.

Author

Tang, Wei, Wang, Xuefang, Wu, Feng, Geng, Xiaoyu, and Zhu, Jiangfeng

Subjects
*SWORDFISH, *OCEAN temperature, *RECEIVER operating characteristic curves, *OCEAN, *FISH industry, *TUNA fisheries
Abstract

Many oceanic species in pelagic habitats move vertically through the water column, highlighting the ecological importance of that spatial environment for modeling habitats of marine species. The role and importance of multiple oceanic subsurface environmental variables in modeling the habitat suitability of swordfish (Xiphias gladius), a highly migratory large pelagic fish, is poorly understood. In this study, we analyzed adult swordfish data from the 2017–2019 Chinese Indian Ocean tuna longline fishery observer. We used the maximum entropy model (MaxEnt) and random forest model (RF) to compare modeling schemes that included multiple subsurface environmental datasets. The area under receiver operating characteristic curve (AUC) from training and test sets was evaluated to investigate whether the inclusion of subsurface variables could enhance model performance and affect the simulation results. This analysis showed that model performance was significantly enhanced after addition of subsurface environmental variables, and the best model fit was achieved at 200–300 m depth. Sea water temperature, dissolved oxygen, net primary production, and ocean mixed layer depth were the critical environmental factors constituting catchability for swordfish in the Western Indian Ocean. As the depth increased, dissolved oxygen became the most important environmental factor, replacing surface temperature. Compared with the surface model, the location and extent of areas of high catchability in certain months changed significantly after the addition of subsurface variables. The results of this study provide evidence for a better understanding of the selection of critical environmental variables and improvement of model performance in 3D habitat modeling of pelagic fish. [ABSTRACT FROM AUTHOR]

Published
2024
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