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Optimal Controller Design for Non-Affine Nonlinear Power Systems with Static Var Compensators for Hybrid UAVs

Tsinghua science and technology 2022年第1期27卷 196-206页

作者： Yanchu Li Qingqing Ding Shufang Li Stanimir Valtchev Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networkand School of Information&Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua UniversityBeijing 100084China the Nova School of Science and Technology(FCT/UNL) Caparica 2829-516LisbonPortugal Technical University of Sofia(TUS) Sofia 2125Bulgaria

A generalized non-affine nonlinear power system model is presented for a single machine bus power system with a Static Var Compensator(SVC)or State Var System(SVS)for hybrid Unmanned Aerial Vehicles(UAVs).The model is constructed by differential algebraic equations on the MATLAB-Simulink platform with the programming technique of its *** the inverse system method and the Linear Quadratic Regulation(LQR),an optimized SVC controller is *** simulations under three fault conditions show that the proposed controller can effectively improve the power system transient performance.

关键词： Static Var Compensator(SVC) Unmanned Aerial Vehicles(UAV) power system non-affine nonlinear control inverse system method Linear Quadratic Regulation(LQR)

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Effects of High Al Content On the Phase Constituents and Thermal Properties in Nicocraly Alloys

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SSRN 2024年

作者： Zhang, Jin Nie, Zhihua Tan, Chengpeng Mu, Rende Li, Shilei Ning, Xianjin Tan, Chengwen School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Co. Ltd. Suzhou215211 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing100095 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

MCrAlY (M = Ni and/or Co) metallic coatings are essential for the protection of hot-end components against thermal and corrosion damage. Increasing the Al content is considered a feasible solution to improve the high temperature performance of MCrAlY coatings. In this paper, the effects of high Al contents (12 – 20 wt.%) on the phase constituents and cast microstructures in MCrAlY alloys were studied by high-energy X-ray diffraction and electron microscopy techniques combined with phase equilibria calculations. High Al content improved the stability of β, σ, and α phases. Meanwhile, an evolution of cast microstructure morphology from dendrite structure to equiaxed grain structure was observed. The thermal properties were analyzed, which were closely related to the phase constituents and solid-to-solid phase transitions at evaluated temperatures. This work is instructive for developing high Al content MCrAlY coatings for next generation thermal barrier applications. © 2024, The Authors. All rights reserved.

关键词： Morphology

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Effects of High Al Contents on the Phase Constituents and Thermal Properties in Nicocraly Alloys

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SSRN 2024年

关键词： Morphology

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Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene

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Journal of Plant Ecology 2024年第5期17卷 1-4页

作者： Zhonghua Ning Tian Xie Xinxin Wang Zhenchang Zhu Cong Chen Baoshan Cui Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration School of Ecology and Nature ConservationBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station for Wetland Ecosystems of the Yangtze EstuarySchool of Life ScienceFudan UniversityShanghai 200433China School of Ecology Environment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Research and Development Center for Watershed Environmental Eco-engineering Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China

This editorial summarizes the contributions to the Special Issue Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene',established under the Journal of Plant Ecology.

关键词： Biodiversity ecosystems restoration

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The effect of primary and secondary O phase on the mechanical properties and deformation behavior of Ti2AlNb alloy

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Journal of Alloys and Compounds 2025年 1032卷

作者： Zhou, Minghang Bu, Zhiqiang Zhou, Yi Wang, Jiakun Zhu, Liang Huang, Xu Li, Jinfu State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The effect of different microstructure characteristics on the mechanical properties and deformation behavior of the Ti2AlNb alloy are investigated. The results show that the mechanical properties of the Ti2AlNb alloy can be significantly enhanced by modulating the size and content of the primary O (Opri) and secondary O (Osec) phase. Quasi-in-situ tensile tests and transmission electron microscopy observations indicate that the B2 phase is the primary deformation phase, with tensile deformation mainly utilizing the {110} slip systems, while the deformation of the O phase is governed by the basal slip system and minor prismatic slip systems. The Opri phase can simultaneous deformation with the B2 phase through single, double, and cross-slip modes, thus promoting the uniform plastic deformation. In contrast, the Osec phase can effectively impede dislocation slip and generate higher local stress levels. Therefore, to maintain the overall uniform deformation, the dislocations tend to pass through the Osec phase via cross-slip mode. The strengthening mechanism calculations suggest that the primary strengthening mechanisms of the Ti2AlNb alloy after heat treatment are the solid solution strengthening, and Orowan strengthening of Osec phase. These findings will provide a theoretical basis for optimization of microstructure and mechanical properties of Ti2AlNb alloy in the future. © 2025 Elsevier B.V.

关键词： Tenacity

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Development of a Method to Determine the Environmental Burden of Diseases and an Application to Identify Factors Driving Changes in the Number of PM_(2.5)-Related Deaths in China between 2000 and 2010

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Environment & Health 2024年第9期2卷 642-650页

作者： Ning Kang Pengfei Li Tao Xue Tong Zhu Institute of Reproductive and Child Health National Health Commission Key Laboratory of Reproductive Health/Department of Epidemiology and BiostatisticsMinistry of Education Key Laboratory of Epidemiology of Major Diseases(PKU)School of Public HealthPeking University Health Science CenterBeijing 100191China Institute of Medical Technology Peking University Health Science CenterBeijing 100191China Advanced Institute of Information Technology Peking UniversityHangzhou 311215China State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management and Center for Environment and HealthPeking UniversityBeijing 100871China State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management and Center for Environment and Health and State Key Joint Laboratory of Environment Simulation and Pollution ControlCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

The attributable burden is codetermined by the exposure level and nontarget ***,the conventional method of health impact assessment based on preestablished exposure−response functions includes only a few well-known characteristics and thus is insufficient to capture the comprehensive *** aimed to develop a method to fuse health impact assessment with epidemiological analysis and to identify factors driving baseline *** method was applied to identify the factors underlying the change in the number of fine particulate matter(PM_(2.5))related deaths in China between 2000 and *** the study period,the number of PM_(2.5)-related deaths across China's Mainland increased by 0.62(95%CI:0.57,0.69)million,with 0.65(95%CI:0.47,0.91)million,0.55(95%CI:0.39,0.79)million,and 0.11(95%CI:0.06,0.18)million deaths being associated with increased PM_(2.5)exposure,population aging,and growth in population size,***,economic growth,urbanization,improvement of welfare services,and improvement of hospital services resulted in 0.25(95%CI:0.15,0.40)million,0.16(95%CI:0.10,0.27)million,0.16(95%CI:0.09,0.26)million,and 0.09(95%CI:0.05,0.15)million fewer deaths,*** indicated that increased exposure was the major driver of the change in the number of PM_(2.5)-related deaths,and economic growth was the main driver of increased resilience to air pollution.

关键词： health burden decomposition analysis air pollution fine particulate matter premature deaths

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Effects of nanoceramic particle size and content on the wear resistance of micro-arc oxidation coatings for 2A12 aluminum alloy

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Heliyon 2024年第19期10卷 e38719页

作者： Li, Wen Cheng, Ming Zhang, Xiaochen Wei, Guoke Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing 100024 China Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology Institute Beijing 100024 China

The 2A12 aluminum alloy, renowned for its exceptional mechanical properties, encounters significant limitations in applications involving abrasive environments or frequent contact with other surfaces due to its inadequate wear resistance. This shortcoming substantially reduces the service life of components and escalate maintenance costs, highlighting the urgent need for advanced surface modification techniques. This study meticulously investigates the influence of nanoceramic particle size and content on the wear resistance of micro-arc oxidation (MAO) coatings, a surface modification technique renowned for forming dense, adherent ceramic layers on aluminum alloys. The systematic experimentation revealed that the incorporation of 150 nm α-Al₂O₃ nanoparticles into the MAO matrix achieves an optimal dispersion, leading to a substantial enhancement in wear resistance. The sample with a 5 g/L concentration of 150 nm α-Al₂O₃ nanoparticles doping in the MAO electrolyte demonstrated the lowest mass loss, underscoring its enhanced wear resistance. The enhanced microstructure, enriched with hard ceramic phases such as α-Al₂O₃ and mullite, plays a pivotal role in withstanding wear. Moreover, this study identified that an optimal balance of surface roughness and coating thickness is essential for achieving enhanced wear resistance. The findings of this research provide a strategy for the design of wear-resistant coatings tailored for high-performance applications across aerospace, automotive, and general engineering industries. By optimizing the particle size and concentration in MAO coatings, this study paves the way for the development of durable materials capable of thriving in demanding environments, thereby extending the service life and reducing maintenance requirements of components. © 2024 The Authors

关键词： 2A12 aluminum alloy Micro-arc oxidation Nanoceramic particles Surface engineering Wear resistance

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Interfacial Si-O Coordination for Inhibiting the Graphite Phase Enables Superior Sic/Nb Heterostructure Joining by Auni

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SSRN 2024年

作者： Li, Peixin Yan, Yaotian Zhang, Zilong Wang, Yaoxuan Zhang, Jingkang Qiao, Liang Cao, Jian Qi, Junlei State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China

The reaction between SiC and Ni base brazing alloy is extremely intense, where the brittle Ni-Si compound and accompanied dissociate graphite phase as the interfacial reaction product in the joint damage the mechanical properties. In this study, the design of "graphite-controlled" heterogeneous integration component structure on SiC surface is developed to weaken the intense reaction of Ni and SiC. The high-quality surface Si-O coordination was successfully achieved by plasma enhanced chemical vapor deposition (PECVD) method at relatively low temperature on SiC, which increases the Si bond strength due to that the higher binding energy of Si-O (451 KJ/mol) than that of Si-C (347 KJ/mol). SiO2 films enhance the mechanical properties of the joint through macro-weak side interface interlocking and micro-stress mismatch regulation. The shear strength of SiC/Nb heterostructure joints by AuNi alloy was increased by 44%, which paves an inspiring way for boosting heterogeneous integration of SiC ceramic components. © 2024, The Authors. All rights reserved.

关键词： Binary alloys

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Effect of two-dimensional nanomaterials with different addition amounts on organic fluorosilicone resin antifouling coatings

Effect of two-dimensional nanomaterials with different addit...

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第十二届全国腐蚀与防护大会

作者： Ming Cheng Wen Li Guoke Wei Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology Institute School of Mechanical Engineering and Automation Beihang University

Nowadays, biofouling, the process of continuous enrichment of large and small organisms in the ocean on man-made surfaces, is a worldwide problem. It has a ring-breaking effect on all sea-related weapons and equipment, increasing sea-related aircraft drag, reducing speed and affecting combat effectiveness. The solution to biofouling has always relied on the poisoning effect of heavy metal ions, which has also caused serious pollution of the marine environment. In recent years, with the in-depth research on nanomaterials, it provides a new solution for the prevention and removal of biofouling. Silicone and fluorine antifouling coatings are widely used as antifouling coatings. But they both have advantages and disadvantages, so making the silicone chain is the main chain, introducing a certain amount of-CF3 group in the side chain, and using the ultra-low surface energy property of this group tends to be oriented to the surface, while the whole macromolecule maintains the high elasticity property of linear polysiloxane, so that it has the characteristics of both silicone and fluorine antifouling coatings. In addition to the copolymerization of silicone and fluorine, studies have shown that the physical blending of inert low relative molecular mass organic fluorine compounds(perfluoropolyethers, fluorinated acrylate copolymers, etc.) in silicone could improve the antifouling properties of the coating. These materials have great potential in antifouling research field. The two-dimensional nanomaterials have a unique role in the antifouling performance enhancement of organic fluorosilicone coatings. In this study, through the covalent hybridization and functionalized modification of various two-dimensional nanomaterials(e.g., bismuth tungstate, bismuth chloride oxide, bismuth bromide oxide, bismuth iodide oxide, tungsten oxide), two-dimensional nanohybrid materials with a sheet-sheet nanostructure were built, which led to a significant improvement of the overall mechanic

关键词： organic fluorosilicone resin two-dimensional nanomaterials antifouling performance

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The staggered-layer induced elasticity strengthening mechanism in flexible Bi2Te3

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Matter 2025年

作者： Huang, Xiege Wu, Luoqi Hu, Mingyuan Feng, Xiaobin Zhai, Pengcheng Li, Wenjuan Duan, Bo He, Jiaqing Li, Guodong Zhang, Qingjie Goddard, William A. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Physics and Mechanics Wuhan University of Technology Wuhan430070 China Guangdong Provincial Key Laboratory of Advanced Thermoelectric Materials and Device Physics Shenzhen Key Laboratory of Thermoelectric Materials and Department of Physics Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Materials and Process Simulation Center California Institute of Technology PasadenaCA91125 United States

Wearable flexible devices require the development of thermoelectric (TE) materials with high strength, excellent elastic bendability, and superior ductility. Here we report a staggered-layer strategy that overcomes the strength-flexibility dilemma. Our findings indicate that the newly formed strong Bi–Bi covalent bond between the staggered layer leads to an average 40% increase in the bond energy of the van der Waals Te–Te bond. A large Poisson's ratio leads to a high maximum linear elastic strain (ΕEmax), enhancing shear strength by 83.3%, which is consistent with a 92.2% increase in micro-pillar compressive strength. The narrow stiffness gap and bond energy gap facilitate the coordinated deformation that maintains sustained linear elasticity during compression. Moreover, the low BFCs of the Te–Te and Te–Bi bonds (0.72 eV/Å2 and 3.85 eV/Å2) contribute to the experimentally observed bending flexibility. This staggered-layer-induced elasticity strengthening mechanism offers a promising strategy for the rational design of highly reliable wearable TE devices. © 2025 Elsevier Inc.

关键词： Compressive strength

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