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331 results on '"Wei, Xiaoqian"'

10. 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

11. 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

26. Surface Coordination Environment Engineering on PtxCu1–x Alloy Catalysts for the Efficient Photocatalytic Reduction of CO2 to CH4

Author

Wang, Xin, primary, Liao, Haohong, additional, Tan, Wei, additional, Song, Wang, additional, Li, Xue, additional, Ji, Jiawei, additional, Wei, Xiaoqian, additional, Wu, Cong, additional, Yin, Chenxu, additional, Tong, Qing, additional, Peng, Bo, additional, Sun, Shangcong, additional, Wan, Haiqin, additional, and Dong, Lin, additional

Published
2024
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27. Multi-step Prediction of Financial Asset Return Volatility Using Parsimonious Autoregressive Sequential Model

Author

Fan, Xiangru, Wei, Xiaoqian, Wang, Di, Zhang, Wen, Qi, Wu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bitetta, Valerio, editor, Bordino, Ilaria, editor, Ferretti, Andrea, editor, Gullo, Francesco, editor, Pascolutti, Stefano, editor, and Ponti, Giovanni, editor

Published
2020
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31. 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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39. Switching Product Selectivity in CO2 Electroreduction via Cu−S Bond Length Variation.

Author

Wei, Xiaoqian, Li, Zijian, Jang, Haeseong, Gyu Kim, Min, Liu, Shangguo, Cho, Jaephil, Liu, Xien, and Qin, Qing

Subjects
*IONIC bonds, *CHEMICAL bond lengths, *COVALENT bonds, *DENSITY functional theory, *BINDING energy, *ELECTROLYTIC reduction
Abstract

Regulating competitive reaction pathways to direct the selectivity of electrochemical CO2 reduction reaction toward a desired product is crucial but remains challenging. Herein, switching product from HCOOH to CO is achieved by incorporating Sb element into the CuS, in which the Cu−S ionic bond is coupled with S−Sb covalent bond through bridging S atoms that elongates the Cu−S bond from 2.24 Å to 2.30 Å. Consequently, CuS with a shorter Cu−S bond exhibited a high selectivity for producing HCOOH, with a maximum Faradaic efficiency (FE) of 72 %. Conversely, Cu3SbS4 characterized by an elongated Cu−S bond exhibited the most pronounced production of CO with a maximum FE of 60 %. In situ spectroscopy combined with density functional theory calculations revealed that the altered Cu−S bond length and local coordination environment make the *HCOO binding energy weaker on Cu3SbS4 compared to that on CuS. Notably, a volcano‐shaped correlation between the Cu−S bond length and adsorption strength of *COOH indicates that Cu−S in Cu3SbS4 as double‐active sites facilitates the adsorption of *COOH, and thus results in the high selectivity of Cu3SbS4 toward CO. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Bridged Pt−OH−Mn Mediator in N‐coordinated Mn Single Atoms and Pt Nanoparticles for Electrochemical Biomolecule Oxidation and Discrimination.

Author

Wei, Xiaoqian, Lin, Yanjuan, Wu, Zhenwei, Qiu, Yiwei, Tang, Yinjun, Eguchi, Miharu, Asahi, Toru, Yamauchi, Yusuke, and Zhu, Chengzhou

Subjects
*ATOMS, *STRUCTURE-activity relationships, *NANOPARTICLES, *CATALYST structure, *ELECTROCHEMICAL sensors
Abstract

The rational design of efficient catalysts for uric acid (UA) electrooxidation, as well as the establishment of structure‐activity relationships, remains a critical bottleneck in the field of electrochemical sensing. To address these challenges, herein, a hybrid catalyst that integrates carbon‐supported Pt nanoparticles and nitrogen‐coordinated Mn single atoms (PtNPs/MnNC) is developed. The metal‐metal interaction during annealing affords the construction of metallic‐bonded Pt−Mn pairs between PtNPs and Mn single atoms, facilitating the electron transfer from PtNPs to the support and thereby optimizing the electronic structure of catalysts. More importantly, experiments and theoretical calculations provide visual proof for the 'incipient hydrous oxide adatom mediator' mechanism for UA oxidation. The Pt−Mn pairs first adsorb OH* to construct the bridged Pt−OH−Mn mediators to serve as a highly active intermediate for N−H bond dissociation and proton transfer. Benefiting from the unique electronic and geometric structure of the catalytic center and reactive intermediates, PtNPs/MnNC exhibits superior electrooxidation performance. The electrochemical sensor based on PtNPs/MnNC enables sensitive detection and discrimination of UA and dopamine in serum samples. This work offers new insights into the construction of novel electrocatalysts for sensitive sensing platforms. [ABSTRACT FROM AUTHOR]

Published
2024
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