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Recent Progress on Metal-Enhanced Photocatalysis:A Review on the Mechanism

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Research 2021年第1期2021卷 885-900页

作者： Ming Fang Xiaoli Tan Zhixin Liu Baowei Hu xiangke wang College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206China School of Life Science Shaoxing UniversityShaoxing 312000China

Metal-enhanced photocatalysis has recently received increasing interest,mainly due to the ability of metal to directly or indirectly degrade *** this review,we briefly review the recent breakthroughs in metal-enhanced *** discussed the recent progress of surface plasmon resonance(SPR)effect and small size effect of metal nanoparticles on photocatalysis;in particular,we focus on elucidating the mechanism of energy transfer and hot electron injection/transfer effect of metal nanoparticles and clusters while as photocatalysts or as ***,we discuss the potential applications of metal-enhanced photocatalysis,and we also offer some perspectives for further investigations.

关键词： breakthrough effect dating

A Novel Collision Avoidance Method for Fixed-wing Unmanned Aerial Vehicles

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A Novel Collision Avoidance Method for Fixed-wing Unmanned A...

第三十九届中国控制会议

作者： Shulong Zhao xiangke wang College of Intelligence Science and Technology National University of Defense Technology

In this paper, we study collision avoidance problems with fixed-wing unmanned aerial vehicles（UAVs）. According to the spatial position and relative speed between the UAVs, several sufficient conditions for avoiding collisions are *** emergency control algorithm is designed based on the sufficient conditions to ensure that the UAVs can be driven from a dangerous state to the safe area. In order to prevent frequent switching of states of the UAV between "safe mode" and "danger mode", a conflict buffer is additionally introduced for conflict resolution and smooth transition. The sufficient conditions can not only be applied to the collision avoidance problem with static and dynamic obstacles, but also can be directly extended to the internal collision avoidance between multiple vehicles. Meanwhile, control input saturation is explicitly considered for the emergency maneuver. Simulations are presented to illustrate effectiveness of the proposed algorithm.

关键词： fixed-wing UAVs collision avoidance sufficient conditions conflict buffer

Investigation of radionuclide～(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study

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Science China Chemistry 2012年第4期55卷 632-642页

作者： YANG ShiTong,SHENG GuoDong,GUO ZhiQiang,TAN XiaoLi,XU JinZhang & wang xiangke Key Laboratory of Novel Thin Film Solar Cells,Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China Key Laboratory of Novel Thin Film Solar Cells Institute of Plasma Physics Chinese Academy of Sciences Hefei China

The sorption behavior and microscopic sequestration mechanisms of radionuclide 63Ni(II) on mordenite as a function of aging time,ionic strength,initial 63Ni(Ⅱ) concentrations,solid content and coexistent electrolyte ions were investigated by the com-bination of batch and EXAFS *** experiment results show that the sorption of 63Ni(Ⅱ) is dependent on ionic strength at pH*** sorption percentage of 63Ni(Ⅱ) on mordenite increases with increasing solid content,while the sorption capacity decreases as solid content *** presence of different elec-trolyte ions can enhance or inhibit the sorption of Ni(II) on mordenite in various *** analysis results of the sam-ples under three different ionic strengths suggest that the retained 63Ni(Ⅱ) in these samples exists in an octahedral environment with six water *** the initial period of rapid uptake,the sorption of 63Ni(Ⅱ) is dominated by the formation of in-ner-sphere surface *** aging time increases,63Ni(Ⅱ) sequestration behavior tends to be mainly controlled by the formation of Ni phyllosilicate co-precipitates and/or Ni(OH)2(s) *** for the second shell fit of the sample pre-pared at an initial 63Ni(Ⅱ) concentration of 100 mg/L indicate the possible formation of Ni polynuclear surface *** the macroscopic sorption data and the molecular level evidence of 63Ni(Ⅱ) surface speciation at the mordenite/water in-terfaces should be factored into better predictions of the mobility and bioavailability of 63Ni(Ⅱ) in environment mediums.

关键词： EXAFS技术丝光沸石放射性核素机制 Ni(OH)2 吸附行为离子强度扣押

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Nonlinear Consensus under Directed Graph via the Edge Laplacian

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Nonlinear Consensus under Directed Graph via the Edge Laplac...

第26届中国控制与决策会议

作者： Zhiwen Zeng xiangke wang Zhiqiang Zheng College of Mechanic Engineering and Automation National University of Defense Technology

This paper considers a leaderless consensus problem for multi-agent system with inherently nonlinear dynamics under directed graph. To provide an effective perspective to handle the consensus problem, an innovative concept about the edge Laplacian is developed for directed graph. The algebraic properties of the graph Laplacian and edge Laplacian bare a lot in common, and the edge Laplacian has much potential to solve the leaderless consensus problem under the edge agreement framework. By using the proposed consensus protocol, the technical challenges caused by the inherently nonlinear dynamics can be well handled. Finally, the effectiveness of the theoretical results is demonstrated through simulation.

关键词： Leaderless consensus Edge Laplacian Inherently Nonlinear Dynamics Edge Agreement

生物质光化学提取对废水中Cr(Ⅵ)解毒和铬资源的选择性回收

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科学通报 2022年第36期67卷 4297-4299页

作者：姚玲沈泽文姬濯宇胡烨子唐铎月赵桂霞王祥科华北电力大学环境科学与工程学院北京102206

六价铬(Cr(Ⅵ))存在于各种工业废水中,如电镀、印刷、制革、染料和陶瓷等[1,2].因为Cr(Ⅵ)的高毒性、巨大的工业消耗和我国铬资源的低储备量,所以对Cr(Ⅵ)进行解毒,并从含铬废水中回收铬非常必要[3].文献[4~6]报告的方法或传统方法存在... 详细信息

六价铬(Cr(Ⅵ))存在于各种工业废水中,如电镀、印刷、制革、染料和陶瓷等[1,2].因为Cr(Ⅵ)的高毒性、巨大的工业消耗和我国铬资源的低储备量,所以对Cr(Ⅵ)进行解毒,并从含铬废水中回收铬非常必要[3].文献[4~6]报告的方法或传统方法存在很多缺点,如苛刻的反应条件、高成本、使用有毒的还原剂、反应后造成二次污染、缺乏选择性等.

关键词： Cr(Ⅵ) 含铬废水工业废水二次污染储备量工业消耗光化学解毒

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Distributed anti-flocking method for area coverage of multiple unmanned aerial vehicles

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Distributed anti-flocking method for area coverage of multip...

第三十九届中国控制会议

作者： Mengge Zhang Jie Li xiangke wang College of Intelligence Science and Technology National University of Defense Technology

The area coverage problem is an important issue because it can minimize uncertainty in a complex and unknown environment. This paper adopts a distributed anti-flocking algorithm inspired by the social behavior of solitary animals, which enables self-organized collaboration of multiple unmanned aerial vehicles（multi-UAVs） to achieve effective coverage of the mission area. The designed area coverage map represents the historical coverage information of each unmanned aerial vehicle（UAV）. According to the rules of collision avoidance, decentering, and selfishness in the distributed anti-flocking algorithm, the UAVs are guided to move towards the direction that maximizing the coverage area and try to reduce the overlap of coverage region as well. Simulations show that the algorithm can achieve approximate full coverage of the task area and has good scalability,adaptability, and robustness.

关键词： Anti-flocking Area Coverage Multiple Unmanned Aerial Vehicles

Monocular Vision based Autonomous Landing of Quadrotor through Deep Reinforcement Learning

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Monocular Vision based Autonomous Landing of Quadrotor throu...

第37届中国控制会议

作者： Yinbo Xu Zhihong Liu xiangke wang College of Mechatronic Engineering and Automation National University of Defense Technology

An improved deep reinforcement learning（DRL） method is proposed to solve autonomous landing problem of quadrotor. Autonomous landing is a significant function for unmanned aerial vehicle（UAV） such as quadrotor. Previous solutions are mainly based on relative position calculation or the landmark detection, which either needs massive additional sensors or lacks intelligence. In this paper, we focus on realizing autonomous landing through DRL method. Whole landing process is implemented by an improved deep Q-learning network（DQN） based end-to-end control scheme. Only one down-looking camera is used to capture raw images directly as input states. An Aruco tag is placed at the landing region for feature extraction. Double network and the dueling architecture are applied to improve DQN algorithm. Besides, the reward function is well designed to fit the auto-landing scenario. The experiments show that the improved DQN can make the quadrotor land on the landmark successfully and achieve better performance while comparing to the original deep Q-learning solution.

关键词： Unmanned Aerial Vehicle(UAV) Autonomous Landing Deep Reinforcement Learning(DRL) DQN

Transfer Learning via Linear Multi-variable Mapping under Reinforcement Learning Framework

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Transfer Learning via Linear Multi-variable Mapping under Re...

第36届中国控制会议

作者： Qiao Cheng xiangke wang Lincheng Shen College of Mechatronics and Automation National University of Defense Technology

ISBN: (纸本)9781538629185

Though popular in many agent learning tasks,reinforcement learning still faces problems,such as long learning time in complex *** learning could shorten the learning time and improve the performance in reinforcement learning by reusing the knowledge acquired from different but related source *** to the difference in state space and/or action space of the target and source task,transfer via inter-task mapping is a popular *** design of the inter-task mapping is very critical to this transfer learning *** this paper,we propose a linear multi-variable mapping（LMVM） for the transfer learning to make a better use of the knowledge learned from the source *** the inter-task mapping used before,the LMVM is not a one-to-one mapping but a one-to-many mapping,which is based on the idea that the element in target task is related with several similar elements from source *** test transfer learning via our new mapping on the Keepaway *** experimental results show that our method could make the reinforcement learning agents learn much faster than those without transfer and those transfer with simpler mappings.

关键词： Transfer Learning Reinforcement Learning Linear Multi-variable Mapping Inter-task Mapping Keepaway

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无机环境材料及其对环境污染物的去除

无机材料学报 2020年第3期35卷 257-259页

作者：石伟群王祥科中国科学院高能物理研究所华北电力大学环境科学与工程学院

随着人类现代化进程的加快和社会经济的飞速发展,传统能源消耗不断加快,气候变化问题日益凸显。现代工业特别是化学工业的发展在给人们带来便利的同时,也给与人类生活息息相关的生态环境带来了前所未有的改变,导致环境问题成为当今世界... 详细信息

随着人类现代化进程的加快和社会经济的飞速发展,传统能源消耗不断加快,气候变化问题日益凸显。现代工业特别是化学工业的发展在给人们带来便利的同时,也给与人类生活息息相关的生态环境带来了前所未有的改变,导致环境问题成为当今世界面临的巨大挑战。为了更好地应对挑战,保护我们赖以生存的家园,广大科研工作者不断寻求和探索绿色环保并能高效利用的新材料与新技术,着力解决日益严峻的环境污染问题。在这种形势下,新型环境材料与技术受到了广泛重视并得到迅猛发展。

关键词：环境污染物无机环境