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基于MIKE模型的溃坝洪水分析——以惠州抽水蓄能电站上库为例

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广东水利水电 2024年第7期 34-41页

作者：洪敏绮周水兵罗学宁林波周佳麒傅举鹏蔡瀛南方电网调峰调频发电有限公司运行分公司广州511499 广东省水利电力勘测设计研究院有限公司广州510635

以惠州抽水蓄能电站上库范家田水库为研究对象,运用MIKE模型与GIS技术,构建了小金河一维河网数学模型、惠城区二维水流数学模型以及一、二维耦合模型,分析了不同工况组合,评估了范家田水库下游惠城区的溃坝洪水风险,并绘制了淹没水深图... 详细信息

以惠州抽水蓄能电站上库范家田水库为研究对象,运用MIKE模型与GIS技术,构建了小金河一维河网数学模型、惠城区二维水流数学模型以及一、二维耦合模型,分析了不同工况组合,评估了范家田水库下游惠城区的溃坝洪水风险,并绘制了淹没水深图、淹没历时图、到达时间图和淹没范围图,为惠州抽水蓄能电站溃坝洪水风险预报预警的决策提供了科学有力的支持。

关键词： MIKE模型洪水风险图抽水蓄能电站溃坝分析广东省

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基于几何控制的四旋翼轨迹跟踪方法

计算机与数字工程 2024年第4期52卷 1055-1060页

作者：周嘉麒王指辉王民泰印雅萌翁祥瑞南京航空航天大学南京211106

针对欠驱动四旋翼无人机在大角度和复杂机动飞行中的控制问题,提出了一种基于几何控制的轨迹跟踪方法,该控制器具有全局稳定性,系统可以从任何初始状态恢复。首先,对四旋翼系统构型进行建模,解决了非线性流形上平移动力学和旋转动力学... 详细信息

针对欠驱动四旋翼无人机在大角度和复杂机动飞行中的控制问题,提出了一种基于几何控制的轨迹跟踪方法,该控制器具有全局稳定性,系统可以从任何初始状态恢复。首先,对四旋翼系统构型进行建模,解决了非线性流形上平移动力学和旋转动力学之间的耦合效应;其次,针对动态系统的基本几何特征,采用微分几何方法设计了跟踪控制器;最后,对该系统进行仿真验证了轨迹跟踪的闭环稳定性。仿真结果表明,当初始姿态误差小于90°时,系统表现出指数稳定性;当初始姿态误差大于90°小于180°时,系统具有全局指数吸引性。

关键词：四旋翼轨迹跟踪非线性流形几何控制

Coordinatively unsaturated single Co atoms immobilized on C_(2)N for efficient oxygen reduction reaction

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Nano Research 2023年第2期16卷 2294-2301页

作者： Wenjing Xu Yidong Sun jiaqi zhou Maoqi Cao Jun Luo Haili Mao Pengfei Hu Hongfei Gu Huazhang Zhai Huishan Shang Zhi Cai Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Key Laboratory of Efficient and Comprehensive Utilization of Biomass-based Agricultural and Forestry Wastes of Qiannan Qiannan Normal University for NationalitiesDuyun 558000China School of Physics and Technology and MOE Key Laboratory of Artificial Micro-and Nano-structuresWuhan UniversityWuhan 430072China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Physics Beihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 102206China

Developing cost-effective and high-efficiency oxygen reduction reaction(ORR)catalysts is imperative for promoting the substantial progress of fuel cells and metal-air *** coordination and geometric engineering of single-atom catalysts(SACs)occurred the promising approach to overcome the thermodynamics and kinetics problems in high-efficiency ***,we rationally constructed atomically dispersed Co atoms on porous N-enriched graphene material C_(2)N(CoSA-C2N)for efficient oxygen reduction reaction(ORR).Systematic characterizations demonstrated the active sites for CoSA-C2N is as identified as coordinatively unsaturated Co-N_(2)moiety,which exhibits ORR intrinsic ***,the porous N-enriched graphene framework in C_(2)N could effectively increase the accessibility to the active sites and promote mass transfer rate,contributing to improved ORR ***,CoSA-C_(2)N exhibited superior ORR performance in both acidic and alkaline conditions as well as impressive long-term *** coordination and geometric engineering of SACs will provide a novel approach to advanced catalysts for energy related applications.

关键词： single-atom catalysts unsaturated coordination geometric engineering oxygen reduction reaction porous graphene nitride

Large spin Hall effect and tunneling magnetoresistance in iridium-based magnetic tunnel junctions

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Science China(Physics,Mechanics & Astronomy) 2020年第1期63卷 86-92页

作者： jiaqi zhou Hang Yu zhou Arnaud Boumel WeiSheng Zhaop Fert Beijing Institute BDBCSchool of MicroelectronicsBeihang UniversityBeijing 100191China Centre de Nanosciences et de Nanotechnologies CNRSUniversite Paris-SudUniversite Paris-SaclayPalaiseau 91120France

Magnetic tunnel junctions(MTJs)switched by spin-orbit torque(SOT)have attracted substantial interest owing to their advantages of ultrahigh speed and prolonged *** field-free magnetization switching and high tunneling magnetoresistance(TMR)are critical for the practical application of SOT magnetic random access memory(MRAM).In this work,we propose an MTJ structure based on an iridium(Ir)bottom *** metal is a desirable candidate for field-free SOT switching owing to its strong intrinsic spin Hall conductivity(SHC),which can be enhanced via ***,we study TMR in Ir-based MTJs with symmetric and asymmetric ***-based MTJs exhibit large TMR,which can be further enhanced by heavy metal symmetry owing to the resonant tunneling *** comprehensive investigations illustrate that Ir-based MTJs are promising candidates for realizing SOT switching and high TMR.

关键词： magnetic tunnel junction spin Hall effect tunneling magnetoresistance

Multiple model PHD filter for tracking sharply maneuvering targets using recursive RANSAC based adaptive birth estimation

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Journal of Systems Engineering and Electronics 2024年第3期35卷 780-792页

作者： DING Changwen zhou Di ZOU Xinguang DU Runle LIU jiaqi School of Astronautics Harbin Institute of TechnologyHarbin 150001China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing 100076China

An algorithm to track multiple sharply maneuvering targets without prior knowledge about new target birth is proposed. These targets are capable of achieving sharp maneuvers within a short period of time, such as drones and agile *** probability hypothesis density (PHD) filter, which propagates only the first-order statistical moment of the full target posterior, has been shown to be a computationally efficient solution to multitarget tracking problems. However, the standard PHD filter operates on the single dynamic model and requires prior information about target birth distribution, which leads to many limitations in terms of practical applications. In this paper,we introduce a nonzero mean, white noise turn rate dynamic model and generalize jump Markov systems to multitarget case to accommodate sharply maneuvering dynamics. Moreover, to adaptively estimate newborn targets’information, a measurement-driven method based on the recursive random sampling consensus (RANSAC) algorithm is proposed. Simulation results demonstrate that the proposed method achieves significant improvement in tracking multiple sharply maneuvering targets with adaptive birth estimation.

关键词： multitarget tracking probability hypothesis density(PHD)filter sharply maneuvering targets multiple model adaptive birth intensity estimation

Suitability of SDN and MEC to facilitate digital twin communication over LTE-A

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Digital Communications and Networks 2024年第2期10卷 347-354页

作者： Hikmat Adhami Mohammad Alja’afreh Mohamed Hoda jiaqi Zhao Yong zhou Abdulmotaleb El Saddik Mohamed bin Zayed University of Artificial Intelligence Masdar CityAbu DhabiUnited Arab Emirates School of Computer Science and Technology China University of Mining and TechnologyXuzhou221116China School of Electrical Engineering and Computer Science University of OttawaOttawaONK1N 6N5Canada

Haptic is the modality that complements traditional multimedia,i.e.,audiovisual,to evolve the next wave of innovation at which the Internet data stream can be exchanged to enable remote skills and control *** will require ultra-low latency and ultra-high reliability to evolve the mobile experience into the era of Digital Twin and Tactile *** the 5th generation of mobile networks is not yet widely deployed,Long-Term Evolution(LTE-A)latency remains much higher than the 1 ms requirement for the Tactile Internet and therefore the Digital *** work investigates an interesting solution based on the incorporation of Software-defined networking(SDN)and Multi-access Mobile Edge Computing(MEC)technologies in an LTE-A network,to deliver future multimedia applications over the Tactile Internet while overcoming the QoS *** network scenarios were designed and simulated using Riverbed modeler and the performance was evaluated using several time-related Key Performance Indicators(KPIs)such as throughput,End-2-End(E2E)delay,and *** best scenario possible is clearly the one integrating MEC and SDN approaches,where the overall delay,jitter,and throughput for haptics-attained 2 ms,0.01 ms,and 1000 packets per *** results obtained give clear evidence that the integration of,both SDN and MEC,in LTE-A indicates performance improvement,and fulfills the standard requirements in terms of the above KPIs,for realizing a Digital Twin/Tactile Internet-based system.

关键词： LTE-A 5G Digital twin Tactile Internet KPIs SDN MEC NFV Haptic

EvolveKG:a general framework to learn evolving knowledge graphs

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Frontiers of Computer Science 2024年第3期18卷 43-59页

作者： jiaqi LIU Zhiwen YU Bin GUO Cheng DENG Luoyi FU Xinbing WANG Chenghu zhou School of Computer Science Northwestern Polytechnical UniversityXi’an 710129China Department of Computer Science Shanghai Jiao Tong UniversityShanghai 200240China Institute of Geographical Science and Natural Resources Research Chinese Academy of SciencesBejjing 100864China

A great many practical applications have observed knowledge evolution,i.e.,continuous born of new knowledge,with its formation influenced by the structure of historical *** observation gives rise to evolving knowledge graphs whose structure temporally grows over ***,both the modal characterization and the algorithmic implementation of evolving knowledge graphs remain *** this end,we propose EvolveKG–a general framework that enables algorithms in the static knowledge graphs to learn the evolving *** quantifies the influence of a historical fact on a current one,called the effectiveness of the fact,and makes knowledge prediction by leveraging all the cross-time knowledge *** novelty of EvolveKG lies in Derivative Graph–a weighted snapshot of evolution at a certain ***,each weight quantifies knowledge effectiveness through a temporarily decaying function of consistency and attenuation,two proposed factors depicting whether or not the effectiveness of a fact fades away with ***,considering both knowledge creation and loss,we obtain higher prediction accuracy when the effectiveness of all the facts increases with time or remains *** four real datasets,the superiority of EvolveKG is confirmed in prediction accuracy.

关键词： knowledge graph evolution modal characterization algorithmic implementation

Suppression of Co(Ⅱ)ion deposition and hazards:Regulation of SEI film composition and structure

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Journal of Energy Chemistry 2024年第2期89卷 259-265,I0007页

作者： jiaqi Zhan Mingzhu Liu Yutian Xie Jiarong He Hebing zhou Lidan Xing Weishan Li National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs Engineering Research Center of MTEES(Ministry of Education)Research Center of BMET(Guangdong Province)Key Lab.of ETESPG(GHEI)Innovative Platform for ITBMD(Guangzhou Municipality)School of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina

Despite the presence of Li F components in the solid electrolyte interphase(SEI)formed on the graphite anode surface by conventional electrolyte,these Li F components primarily exist in an amorphous state,rendering them incapable of effectively inhibiting the exchange reaction between lithium ions and transition metal ions in the ***,nearly all lithium ions within the SEI film are replaced by transition metal ions,resulting in an increase in interphacial impedance and a decrease in ***,we demonstrate that the SEI film,constructed by fluoroethylene carbonate(FEC)additive rich in crystalline Li F,effectively inhibits the undesired Li^(+)/Co^(2+)ion exchange reaction,thereby suppressing the deposition of cobalt compounds and metallic ***,the deposited cobalt compounds exhibit enhanced structural stability and reduced catalytic activity with minimal impact on the interphacial stability of the graphite *** findings reveal the crucial influence of SEI film composition and structure on the deposition and hazards associated with transition metal ions,providing valuable guidance for designing next-generation electrolytes.

关键词： Lithium-ion batteries Transition metal ions SEI film Composition and structure

WocEA:The visualization of functional enrichment results in word clouds

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Journal of Genetics and Genomics 2018年第7期45卷 415-417页

作者： Wanshan Ning Shaofeng Lin jiaqi zhou Yaping Guo Ying Zhang Di Peng Wankun Deng Yu Xue Key Laboratory of Molecular Biophysics of Ministry of Education College of Life Science and Technology and the Collaborative Innovation Center for Biomedical EngineeringHuazhong University of Science and Technology

The integration, analysis and visualization of the big omics data are critical for addressing a broad spectrum of biological questions. One of the most frequently conducted procedures is enrichment analysis, which statistically tests whether individual functional an- notations of Gent Ontology （GO） or Kyoto Encyclopedia of Genes and Genomes （KEGG） are significantly over-or under-represented in an ＂interesting＂ gene or protein list against the reference set （Tavazoie et al., 1999）.

关键词： WocEA he visualization of functional enrichment results word clouds