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34 results on '"Wei, Xiaoqian"'

5. Distributed Optimal Guidance Laws for Multiple Unmanned Aerial Vehicles Attacking A Moving Target

Author

Wei, Xiaoqian, Yang, Jianying, and Fan, Xiangru

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

In this paper, two cooperative guidance laws based on two-point boundary value are designed to deal with the problem of cooperative encirclement and simultaneous attack under condition of both known target acceleration and unknown target acceleration. The only requirement for the multi-attacker communication network is that it contains a directed spanning tree. The guidance laws can function properly as long as at least one attacker can observed the target. The acceleration components along the attacker-target line of sight in the novel guidance laws can reduce the relative remaining distance between each of the attackers and the target at the same speed, thus completing simultaneous attack and avoiding the calculation of the remaining time. The components of the guidance laws perpendicular to the attacker-target line of sight can make the normal overload of relative motion zero, so that the trajectory will be smooth and the collision problem within the attacker can be avoided. Simulation results verified the practicability of the novel guidance laws., Comment: arXiv admin note: substantial text overlap with arXiv:1906.10790

Published
2019

6. Design of distributed guidance laws for multi-UAV cooperative attacking a moving target based on reducing surrounding area

Author

Wei, Xiaoqian, Yang, Jianying, and Fan, Xiangru

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

In this paper, two cooperative guidance laws based on the area around the target of multiattackers are designed to deal with the problem of cooperative encirclement or simultaneous attack in the case of known target acceleration and unknown target acceleration. Multi-attacker communication network only needs to contain a directed spanning tree, and does not require all attackers to observe the target information, where at least one can observe the target. The components along the attacker-target line of sight in the novel guidance laws can reduce the relative remaining distance between the attacker and the target at the same speed, thus completing simultaneous attack and avoiding the calculation of the remaining time. The components of the guidance laws perpendicular to the attacker-target line of sight can make the normal overload of relative motion zero, so that the trajectory will not be distorted and the collision problem within the attacker group can be avoided. The simulation results verify the practicability of the novel guidance laws., Comment: arXiv admin note: substantial text overlap with arXiv:1906.11153

Published
2019

14. Modulatory effects and structural alteration of gut microbiota by traditional Chinese medicine

Author

Feng Jiarun, Wei Xiaoqian, Chen Jieru, Wang Zirui, Lu Li, Lin Xiukun, Jiang Mengxi, Bauer Rudolf, and Xu Huanli

Subjects
Gut microbiota, Structural alteration, Traditional Chinese medicine, Modulatory effects, Other systems of medicine, RZ201-999, Therapeutics. Pharmacology, RM1-950
Abstract

Objective: Due to the multiple components of traditional Chinese medicine (TCM), the exact mechanisms of their effects on the human body remain unclear. This review aimed to summarize the TCM formulas that have modulatory effects on gut microbiota structure. Methods: Since TCM is usually taken orally, TCM can exhibit direct modulatory effects on gut microbiota. In recent years, a growing amount of research has focused on the regulatory effects of TCM on structural alteration of gut microbiota. PubMed, web of Science, China National Knowledge Infrastructure (CNKI), and Wanfang Data Knowledge Platform (Wanfang) were used to search related articles published in recent years. Results: In this review, we summarize the TCM formulas that have modulatory effects on gut microbiota structure according to their classification. Future directions of research on the regulation of gut microbiota by TCM and its application are also discussed. Conclusion: This review summarized the TCM formulas that have modulatory effects on gut microbiota structure and their interaction mechanisms, which may help to support the effective exploration and application of herbal medicines.

Published
2022
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30. Tuning iron spin states in single-atom nanozymes enables efficient peroxidase mimicking

Author

Wei, Xiaoqian, primary, Song, Shaojia, additional, Song, Weiyu, additional, Wen, Yating, additional, Xu, Weiqing, additional, Chen, Yifeng, additional, Wu, Zhichao, additional, Qin, Ying, additional, Jiao, Lei, additional, Wu, Yu, additional, Sha, Meng, additional, Huang, Jiajia, additional, Cai, Xiaoli, additional, Zheng, Lirong, additional, Hu, Liuyong, additional, Gu, Wenling, additional, Eguchi, Miharu, additional, Asahi, Toru, additional, Yamauchi, Yusuke, additional, and Zhu, Chengzhou, additional

Published
2022
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33. Mesoporous amorphous non-noble metals as versatile substrates for high loading and uniform dispersion of Pt-group single atoms.

Author

Kang Y, Li S, Cretu O, Kimoto K, Zhao Y, Zhu L, Wei X, Fu L, Jiang D, Wan C, Jiang B, Asahi T, Zhang D, Li H, and Yamauchi Y

Abstract

Atomically dispersed Pt-group metals are promising as nanocatalysts because of their unique geometric structures and ultrahigh atomic utilization. However, loading isolated Pt-group metals in single-atom alloys (SAAs) with distinctive bimetallic sites is challenging. In this study, we present amorphous mesoporous Ni boride (Ni-B) as an ideal substrate to uniformly disperse Pt atoms with tunable loadings (1.7 to 12.2 wt %). The effect of the morphology, composition, and crystal phase of the Ni-B host on the growth and dispersion of Pt atoms is discussed. The resulting amorphous Pt-Ni-B mesoporous nanospheres exhibit superior electrocatalytic H 2 evolution performance in acidic media. This strategy holds the potential to synthesize a diverse library of mesoporous amorphous Pt-group SAAs, by leveraging functional amorphous nanostructured 3 d transition-metal borides as substrates, thereby proposing a comprehensive strategy to control atomically dispersed Pt-group metals.

Published
2024
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34. Panax notoginseng saponins promotes stroke recovery by influencing expression of Nogo-A, NgR and p75NGF, in vitro and in vivo.

Author

Liu L, Zhu L, Zou Y, Liu W, Zhang X, Wei X, Hu B, and Chen J

Subjects
Animals, Cells, Cultured, Disease Models, Animal, Drugs, Chinese Herbal pharmacology, Drugs, Chinese Herbal therapeutic use, Gene Expression Regulation drug effects, Male, Nerve Tissue Proteins, Nogo Proteins, Rats, Receptors, Growth Factor, Recovery of Function drug effects, Stroke metabolism, Myelin Proteins biosynthesis, Oligopeptides biosynthesis, Panax notoginseng chemistry, Phytotherapy, Receptors, Nerve Growth Factor biosynthesis, Saponins pharmacology, Saponins therapeutic use, Stroke drug therapy
Abstract

The spontaneous recovery of function after injury in the adult central nervous system is limited due to the several proteins, such as Nogo-A that have repulsive or inhibitory effects on growing neuritis. The Chinese herbal medicine extraction Panax notoginseng saponins (PNS) injection has been widely used and effective in repairing the function of impaired nerves, but the mechanism of this herbal medicine is still poorly understood. This project evaluated the effect of Panax notoginseng saponins on neurological functional recovery and on the expression of Nogo-A, NgR and p75 at 7, 14 and 28 d after middle cerebral artery occlusion (MCAO) in rats and also oxygen-glucose deprivation/reperfusion (OGD/R) model on SH-SY5Y cells. We found that the expression of Nogo-A, NgR and p75 of rats receiving MCAO surgery increased on the 7th day, reached a peak on the 14th or 28th day and maintained high levels and Panax notoginseng saponins significantly decreased these expressions. This may be the mechanism of Panax notoginseng saponins that contributes to the recovery of nerve function, which plays an important role in brain protection after cerebral infarction.

Published
2014
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