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Optimising the electroluminescence performance of ZnS:Cu/epoxy composites via exploring the relationship between electroluminescence intensity and filler intrinsic attributes

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High Voltage 2022年第6期7卷 1099-1110页

作者： Wen Qi Miao Liu Siqi Chen Kun He Luxing Zhao Boyang Shen Xingming Bian State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina China Electric Power Research Institute BeijingChina Electrical Engineering Division University of CambridgeCambridgeUK

Electroluminescent composites have considerable potential for applications in photoelectric display,electric field measurement and other fields due to their advantages of simple preparation and uniform ***,high voltage required by the operation of electroluminescent composites hinders their applications in the electric domain,and research on the relationship between electroluminescence principle of composites and filler intrinsic attributes is *** this paper,the effects of electric field strength,filler mass fraction and voltage frequency on the electroluminescence intensity of ZnS:Cu/epoxy composites are studied,which are majorly used as the luminescent layer of electroluminescent *** enhance the electroluminescence intensity of composites,high-temperature sintered BaTiO_(3)and zinc oxide whiskers(ZnOw)particles are introduced in the base *** finite element method is applied to verify that the matrix of high dielectric constant is in favour of improving the electroluminescence intensity of *** band structure of the ZnS:Cu particle is calculated based on the density functional theory+U method to analyse the intrinsic relationship between electroluminescence and particle electronic *** paper provides a basis for the research of high electroluminescence intensity devices and will be conducive to better understanding on the relationship between electroluminescence principle and filler intrinsic attributes.

关键词： composites ZnS:Cu filler

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An Improved Task Planning Method for Unmanned Swarms with Coupled Physical and Logical Constraints

An Improved Task Planning Method for Unmanned Swarms with Co...

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2024 IEEE International Conference on Unmanned systems, ICUS 2024

作者： Chen, Xiubin Zhang, Lei Xu, Fang Yao, Weiran School of Astronautics Harbin Institude of Technology Harbin China Wuhan 2nd Ship Design and Research Institute Wuhan China Marine Military Intelligence Innovation Institute CSSC Systems Engineering Research Institute Beijing China National Key Laboratory of Complex System Control and Intelligent Agent Cooperation Beijing China

ISBN: (纸本)9798350384185

Traditional task allocation methods for unmanned swarm systems ignore the effects of actual paths, resulting in estimation accuracy *** paper formulates task planning problem by incorporating physical and logical constraints, and establishes an integrated framework of task allocation and path ***-based search method is used to address path planning with physical constraints.A genetic algorithm is employed to solve multi-traveling salesman allocation problem.A bounded suboptimal optimization, a data dictionary, and an island model are introduced to accelerate the convergence speed of the genetic *** experiments verify that compared to the decoupled task planning methods, the proposed method improves task execution efficiency and remains adaptability to various complex spatial maps. © 2024 IEEE.

关键词： Genetic algorithms

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Energy-Consumption Optimization Control for Lunar Rover's Travel with Torque-Distribution-strategy in Rear Wheels

Energy-Consumption Optimization Control for Lunar Rover's Tr...

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IEEE International Conference on Control Science and systems engineering (CCSSE)

作者： Delun Li Jianfei Cao Yiliang Chen Zongwu Xie State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications Beijing Institute of Spacecraft System Engineering Beijing China

ISBN: (数字)9798331517199

ISBN: (纸本)9798331517205

In anticipation of future extensive lunar surface operations, lunar rovers are required to advance towards higher speeds and improved energy conservation. When traveling at high speeds on the lunar surface, the vehicle's energy expenditure is greatly amplified by the influence of the terrain, particularly in conditions where driving and steering are coupled. This paper proposes an energy-saving control strategy for lunar rovers that employs dynamic rear-axle torque distribution, with the goal of optimizing transient energy consumption during travel. To tackle the challenge of non-differentiable functions within the optimization objectives, we suggest using a zeroth-order gradient optimization method for resolution, dynamically constraining the range of control parameters to fulfill the dynamic torque distribution objectives as needed for the task. The energy-saving control effectiveness of the algorithm has been confirmed through simulation, demonstrating a minimum energy-saving ratio of at least 4%, which increases to over 11% as the speed level rises, offering a valuable technical solution for the energy optimization of lunar rovers.

关键词： Space vehicles Energy consumption Torque Distribution strategy Moon Wheels Optimization methods systems engineering and theory Vehicle dynamics Transient analysis

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High-efficiency crystalline carbon nitride photocatalysts:Status and perspectives

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Nano Research 2024年第9期17卷 7840-7863页

作者： Wenji Pu Yunqiao Zhou Lingfeng Yang Haifeng Gong Yuhan Li Qingyu Yang Dieqing Zhang Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Key Laboratory of Catalysis and New Environmental MaterialsChongqing Technology and Business UniversityChongqing 400067China The Education Ministry Key Lab of Resource Chemistry Joint International Research Laboratory of Resource Chemistry of Ministry of EducationShanghai Key Laboratory of Rare Earth Functional Materialsand Shanghai Frontiers Science Center of Biomimetic CatalysisShanghai Normal UniversityShanghai 200234China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

Crystallinity and crystal structure greatly influence the photocatalytic behavior of *** g-C3N4 produced by traditional thermal-induced polycondensation reaction bears low crystallinity and thus poor photoactivity,which originates from the incomplete polymerization of the precursor containing amine groups,abundant hydrogen bonds,and unreacted amino,as well as cyanide functional groups in the *** photocatalytic process,these residual functional groups often work as electron trap sites,which may hinder the transfer of electrons on the plane,resulting in low ***,crystalline carbon nitride(CCN)was reported as a promising photocatalyst because its increased crystallinity not only reduces the number of carriers recombination centers,but also increases charge conductivity and improves light utilization due to extendedπ-conjugated systems and delocalizedπ-*** such,we summarize the recent studies on CCN-based photocatalysts for the photoactivity ***,the unique structure and properties of CCN materials are ***,the preparation methods and modification strategies are well *** also sum up the applications of CCN-based materials in the environmental purification and energy ***,this review concerning CNN materials ends with prospects and challenges in the obtainment of high crystallinity by effective techniques,and the deep understanding of photocatalytic mechanism.

关键词： crystalline carbon nitride preparation method modification strategy photocatalytic application

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The Vibration Signal Analysis system of the Ultra-Precision Fly Cutting Machine Tool 2nd

The Vibration Signal Analysis System of the Ultra-Precision ...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Ding, Yuanyuan Rui, Xiaoting Wang, Guoping Ding, Jianguo Zhang, Jianshu Lu, Hanjing Chen, Yiheng Chang, Yu Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China School of Science Nanjing University of Science and Technology Nanjing China College of Engineering Peking University Beijing China

ISBN: (纸本)9789819980475

The vibration signals of the ultra-precision fly cutting machine tool can reflect the machine tool's state during machining. The accurate analysis of the vibration signals in ultra-precision fly cutting machine tools is of great significance in establishing the relationship between the vibration signals and the machine tool performance. In this paper, a vibration signal analysis system based on LabVIEW is designed for analyzing the measured tool tip vibration signals in the ultra-precision fly cutting machine tool. The analysis of the vibration signals in the time domain, frequency domain, and time–frequency domain is realized. The corresponding relationship between the main vibration frequencies of the tool tip vibration signals in ultra-precision fly cutting machine tool and the machine tool performance is established, which provides a theoretical basis for surface topography prediction, machining parameters optimization, vibration suppression, and structure optimization. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Machine tools

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Tailorable Energetic Behavior of Al/Ti/CuO Composites 3

Tailorable Energetic Behavior of Al/Ti/CuO Composites

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3rd International Conference on Defence Technology, ICDT 2022

作者： Chang, Y.K. Zhao, W.J. Ren, W. Nie, J.X. Wei, C.Q. Zhang, H.L. Zen, X. State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China Science and Technology on Applied Physical Chemistry Laboratory Shaanxi Applied Physics and Chemistry Research Institute Xi'an710016 China Beijing Institute of Electronic System Engineering 100039 China

Aluminum (Al)/Copper oxide (CuO) are mostly common thermites in energetic materials. However, the ignition and combustion of Al/CuO are constrained by the oxide shell coating on the Al core. Titanium (Ti) nanoparticles have been incorporated into Al/CuO system to tune their energetic behavior. The reactivity and combustion heat of Al/Ti/CuO ternary composites have been measured via combustion cell and calorimetry, respectively. The pressurization rate of Al/30% Ti/CuO (the molar percent of Ti in the fuel is 30%) and Al/70% Ti/CuO is 1 and 1.5 times greater than Al/CuO. Consequently, Ti nanoparticles are promising candidate for enhancinging the reactivity of Al/CuO thermites. The results also suggest that Ti nanoparticles could be employed as useful additive in Al-based thermites to tune their combustion behavior. © Published under licence by IOP Publishing Ltd.

关键词： Titanium

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A Special Issue:“Co-optimization and mechanism design of multimodal energy systems under carbon constraints”

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Global Energy Interconnection 2025年第2期8卷 I0002-I0003页

作者： Lin Cheng Xiaojun Wan Department of Electrical Engineering Tsinghua University Planning and Design Research Center Energy Internet Research InstituteTsinghua University State Key Laboratory of Power System Operation and Control Tsinghua University School of Electrical Engineering Beijing Jiaotong University

Against the backdrop of active global responses to climate change and the accelerated green and low-carbon energy transition,the co-optimization and innovative mechanism design of multimodal energy systems have become a significant instrument for propelling the energy revolution and ensuring energy *** increasingly stringent carbon emission constraints,how to achieve multi-dimensional improvements in energy utilization efficiency,renewable energy accommodation levels,and system economics-through the intelligent coupling of diverse energy carriers such as electricity,heat,natural gas,and hydrogen,and the effective application of market-based instruments like carbon trading and demand response-constitutes a critical scientific and engineering challenge demanding urgent solutions.

关键词： multimodal energy systems renewable energy accommodation energy utilization efficiency co optimization carbon constraints climate change carbon emission constraintshow mechanism design

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A GNSS Spoofing Detection Method based on Sparse Decomposition Technique

A GNSS Spoofing Detection Method based on Sparse Decompositi...

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2022 IEEE International Conference on Unmanned systems, ICUS 2022

作者： He, Yuxin Zhuang, Yaqiang Zhuang, Xuebin Lin, Zijian School of System Science and Engineering Sun Yat-sen University Guangzhou China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Beijing China Science and Technology On Complex Aviation Systems Simulation Laboratory Beijing China

ISBN: (数字)9781665484565

ISBN: (纸本)9781665484565

By broadcasting false Global Navigation Satellite system (GNSS) signals, spoofing attacks will induce false position and time fixes within the victim receiver. In this article, we propose a Sparse Decomposition (SD)-based spoofing detection algorithm in the acquisition process, which can be applied in a single-antenna receiver. In the first step, we map the Fast Fourier transform (FFT)-based acquisition result in a two-dimensional matrix, which is a distorted autocorrelation function when the receiver is under spoof attack. In the second step, the distorted function is decomposed into two main autocorrelation function components of different code phases. The corresponding elements of the result vector of the SD are the code-phase values of the spoofed and the authentic signals. Numerical simulation results show that the proposed method can not only outcome spoofing detection result, but provide reliable estimations of the code phase delay of the spoof attack. © 2022 IEEE.

关键词： Fast Fourier transforms

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An Efficient Stability Criterion for Near-Fundamental-Frequency Oscillation Risk Assessment of Wind Power Integrated systems via MMC-HVDC 19th

An Efficient Stability Criterion for Near-Fundamental-Freque...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Wu, Linlin Dong, Wenkai Ren, Yina Wang, Xiao Xie, Xiaorong State Grid Jibei Electric Power Co. Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Beijing100045 China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9789819613823

Recently, near-fundamental-frequency oscillations (NFFOs) have been observed in practical wind power integrated systems via MMC-HVDC (WISM). However, a practical WISM is often high-order, causing the oscillation risk assessment to be computationally heavy. Therefore, in this paper, an efficient stability criterion is proposed, which gives the critical stability conditions considering the impact of number of generators and network topology. Then NFFO risk of a WISM under different numbers of generators and network topologies can be quickly judged. The stability criterion can be obtained via the Nyquist-based stability analysis on a single generator integrated system via MMC-HVDC and hence is simple in application. In addition, derivations of the stability criterion also give an analytical explanation to the NFFO risk induced by the integration of wind power. Finally, effectiveness of the proposed method and conclusions drawn is verified based on a typical WISM. © beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Topology

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Disciplinary structure and development strategy of information geography in China

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Journal of Geographical Sciences 2022年第9期32卷 1670-1682页

作者： LI Xin YUAN Linwang PEI Tao HUANG Xin LIU Guang ZHENG Donghai State Key Laboratory of Tibetan Plateau Earth System Environment and ResourcesInstitute of Tibetan Plateau ResearchCASBeijing100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China Ministry of Education Key Laboratory of Virtual Geographic Environment Nanjing Normal UniversityNanjing210023China State Key Laboratory of Resources and Environment Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing100101China School of Remote Sensing and Information Engineering Wuhan UniversityWuhan430079China Key Laboratory of Digital Earth Science Aerospace Information Research InstituteCASBeijing100094China

The advent of the information era has resulted in exceptional advances in geographic *** domain of geographic science has expanded from traditional physical and human geography to physical,human,and information geography,resulting in the emergence of the field of information *** subdisciplines have gradually formed,i.e.,geographic remote sensing science,geographic information science,and geographic data *** a view towards preparing a description of the disciplinary structure of geographic science for the“Development Strategy of Discipline and Frontier Research in China(2021-2035)”,this article summarizes the history,definition,and disciplinary structure of information *** strategic layout of the discipline,along with the goals and key directions of priority development fields,are also *** insights into this new discipline provided in this paper will promote the development and application of remote sensing and geographic information within the framework of geographic science,advancing the synthesis of geographic research and the integrated development of geographic science.

关键词： information geography geographic remote sensing science geographic information science geographic data science disciplinary structure

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