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作者： Yu, Jianglong Yin, Fengkui Wang, Shaoyan Chang, Liping Gupta, Sushil Key Laboratory of Coal-Based Fuels for Aviation School of Power and Energy Engineering Shenyang Aerospace University Shenyang 110136 China Key Laboratory of Advanced Coal and Coking Technology Liaoning Province School of Chemical Engineering University of Science and Technology Liaoning Anshan Liaoning 114051 China Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China Centre for Sustainable Materials Research and Technology University of New South Wales Sydney NSW 2052 Australia

An integrated hot coal gas cleaning process is proposed with emphasis on simultaneous removal of multiple impurities including sulfur containing species, NOx precursors, mercury and tarry materials. Acti-vated- char-supported sorbents were synthesized by gasifying Fe and Mo impregnated Chinese lignite coal in steam (15%, vol) at 1100 K for 15 min. Sulfur removal properties of the sorbent samples were examined by sulfidation experiments using simulated coal gases (with 4700 ppmv H2S and 470 ppmv COS) at a space velocity of 1000 h-1 using a fixed-bed quartz reactor at the temperature range of 673-873 K. The SEM with EDS and XRD were used to examine the physical and chemical changes in the sorbents during sulfidation. The active metal oxides components were dispersed in the char matrix as nanosize particles resulting in a high reactivity of the sorbents towards H2S and COS contained in coal gases. Under the conditions in this study, the sorbents can effectively remove H2S and COS from the simulated coal gases with high efficiency. Sulfur removal is influenced by the level of iron-loading. The presence of Mo along with Fe in the char-supported sorbents can significantly increase the desulfurization efficiency. © 2010 Elsevier Ltd. All rights reserved.

关键词： Desulfurization

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Event-Triggered Group Attitude Coordinated Control of Multi-spacecraft System with Directed Topology

Event-Triggered Group Attitude Coordinated Control of Multi-...

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International Conference on Guidance, Navigation and Control, ICGNC 2020

作者： Zhou, Shaolei Wang, Shuailei Liu, Wei Wang, Donglai Gao, Xiangyang Naval Aviation University Yantai Shandong264001 China CAS Key Laboratory of human-Machine Intelligence-Synergy Systems Shenzhen Institute of Advanced Technology Chinese Academy of Science Shenzhen518055 China

ISBN: (纸本)9789811581540

Event-triggered group attitude coordinated control of multi-spacecraft system with directed topology is studied. The event-triggered strategy ensures that the system communicate at discrete time instants, thus the communication burden is reduced. Based on assumptions on the topology, the Laplacian matrix of the multi-spacecraft system is a block upper triangular matrix, and the nonnegative eigenvalues of it are positive integers, which can simplify the analysis process. With variable substitution and the Laplacian matrix decomposition, the problem is turned into a second-order group consensus problem, and then turned into a stability problem of a linear system. By properly chosen parameters, the system matrix of the linear system is Hurwitz. With centralized event-triggered mechanism, the control input proposed can lead the system to group attitude coordination, and Zeno behavior is avoided. simulation results show that the variable substitution method utilized and controller designed in this paper are effective. © 2022, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Linear systems

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Investigation of negative-parity states in ^(16)C via deuteron inelastic scattering

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Chinese Physics C 2022年第5期46卷 70-76页

作者： Z.W.Tan J.L.Lou Y.L.Ye Y.Liu D.Y.Pang C.X.Yuan J.G.Li W.Liu Y.Jiang B.Yang L.C.Tao K.Ma Z.H.Li Q.T.Li X.F.Yang J.Y.Xu H.Z.Yu J.X.Han S.W.Bai S.W.Huang G.Li H.Y.Wu H.L.Zang J.Feng J.S.Wang Y.Y.Yang P.Ma Q.Hu Z.Bai Z.H.Gao F.F.Duan L.Y.Hu J.H.Tan S.Q.Sun Y.S.Song H.J.Ong D.T.Tran H.Y.Zhu B.L.Xia School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China School of Physics Beijing Key Laboratory of Advanced Nuclear Materials and PhysicsBeihang UniversityBeijing 100191China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering UniversityHarbin 150001China Research Center for Nuclear Physics Osaka universityOsaka 567-0047Japan Institute of Physics Vietnam Academy of Science and TechnologyHanoi 10000Vietnam Institute of Materials China Academy of Engineering PhysicsMianyang 621907China

Two low-lying unbound states in ^(16)C are investigated by deuteron inelastic scattering in inverse *** the 2^(-) state at 5.45 MeV previously measured in a 1n knockout reaction,a new resonant state at 6.89 MeV is observed for the first *** inelastic scattering angular distributions of these two states are well reproduced by the distorted-wave Born approximation(DWBA)calculation with an l=1 *** addition,the spinparities of the unbound states are discussed and tentatively assigned based on shell model calculations using the modified YSOX interaction.

关键词： negative-parity states inelastic scattering ^(16)C

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Nanomanufacturing and Metrology 2020年第2期3卷 123-132页

作者： Zhanfeng Wan Junjie Zhang Guo Li Zongwei Xu Haijun Zhang Jianguo Zhang Alexander Hartmaier Fengzhou Fang Yongda Yan Tao Sun Center for Precision Engineering.Harbin Institute of Technology Harbin 150001People's Republic of China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyang 621900People's Republic of China State Key Laboratory of Precision Measuring Technology&Instruments Centre of MicroNano Manufacturing TechnologyTianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Interdisciplinary Centre for Advanced Materials Simulation Ruhr-University Bochum44780 BochumGermany

Deformation behavior at grain levels greatly affects the machining characteristics of crystalline *** the present work,we investigate the influence of material anisotropy on ultra-precision diamond cutting of single crystalline and polycrystalline copper by experiments and crystal plasticity finite element ***,diamond turning and in situ SEM orthogonal cutting experiments are carried out to provide direct experimental evidence of the material anisotropy-dependent cutting results in terms of machined surface morphology and chip *** numerical simulations with the analysis of built stress further validate experimental results and reveal the mechanisms governing the material anisotropy *** above findings provide insight into the fabrication of ultra-smooth surfaces of polycrystalline metals by ultraprecision diamond turning.

关键词： Diamond cutting Polycrystalline copper Anisotropy Grain boundary Crystal plasticity finite element

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A Nonlinear PIC Algorithm for High Frequency Waves in Magnetized Plasmas Based on Gyrocenter Gauge Kinetic Theory

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Communications in Computational Physics 2014年第4期15卷 1167-1183页

作者： Jian Liu Zhi Yu Hong Qin Department of Modern Physics and Collaborative Innovation Center for Advanced Fusion Energy and Plasma Sciences University of Science and Technology of ChinaHefeiAnhui 230026China Key Laboratory of Geospace Environment University of Science and Technology of ChinaChinese Academy of SciencesHefeiAnhui 230026China Theory and Simulation Division Institute of Plasma PhysicsChinese Academy of SciencesHefeiAnhui 230031China Plasma Physics Laboratory Princeton UniversityPrincetonNew Jersey 08543USA

Numerical methods based on gyrocenter gauge kinetic theory are suitable for first principle simulations of high frequency waves in magnetized ***δf gyrocenter gauge PIC simulation for linear rf wave has been previously *** this paper we further develop a full-f nonlinear PIC algorithm appropriate for the nonlinear physics of high frequency waves in magnetized *** cases of linear rf waves are calculated as a benchmark for the nonlinear GyroGauge code,meanwhile nonlinear rf-wave phenomena are *** technique and advantage of the reduction of the numerical noise in this full-f gyrocenter gauge PIC algorithm are also discussed.

关键词： Gyrocenter gauge kinetics multi-scale problem nonlinear system particle-in-cell

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A new rhombohedral phase and its 48 variants inβtitanium alloy

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2849-2863页

作者： Xin-nan WANG Ming HAN Fu-rong ZHANG Guang-ming ZHAO Zhi-shou ZHU Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China

A new rhombohedral phase(termed R′)in a solution-aging-treated titanium alloy(Ti-4.5Al-6.5Mo-2Cr-2Nb-1V-1Sn-1Zr,wt.%)was *** accurate Bravais lattice parameters were determined by a novel unit cell reconstruction method based on conventional selected-area electron diffraction(SAED)*** orientation relationship between R'phase and BCC phase was *** results show that the R′phase is found to have 48crystallographically equivalent variants,resulting in rather complicated SAED patterns with high-order reflections.A series of in-situ SAED patterns were taken along both low-and high-index zone axes,and all weak and strong reflections arising from the 48 variants were properly explained and directly assigned with self-consistent Miller indices,confirming the presence of the rhombohedral ***,some criteria were also proposed for evaluating the indexed results,which together with the Bravais lattice reconstruction method shed light on the microstructure characterization of even unknown phases in other alloys.

关键词： titanium alloy rhombohedral phase Bravais lattice reconstruction variant orientation relationship

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Analysis of overload-based cascading failure in multilayer spatial networks

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Chinese Physics B 2020年第9期29卷 404-414页

作者： Min Zhang Xiao-Juan Wang Lei Ji Mei Song Zhong-Hua Liao School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation CenterBeijing 100854China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System EngineeringBeijing 100854China

Many complex networks in real life are embedded in space and most infrastructure networks are interdependent,such as the power system and the transport *** this paper,we construct two cascading failure models on the multilayer spatial *** our research,the distance l between nodes within the layer obeys the exponential distribution P(l)~exp(-l/ζ),and the length r of dependency link between layers is defined according to node *** entropy approach is applied to analyze the spatial network structure and reflect the difference degree between *** metrics,namely dynamic network size and dynamic network entropy,are proposed to evaluate the spatial network robustness and *** the cascading failure process,the spatial network evolution is analyzed,and the numbers of failure nodes caused by different reasons are also counted,***,we discuss the factors affecting network *** demonstrate that the larger the values of average degree,the stronger the network *** the length r decreases,the network performs *** the probability p is small,asζdecreases,the network robustness becomes more *** p is large,the network robustness manifests better performance asζ*** results provide insight into enhancing the robustness,maintaining the stability,and adjusting the difference degree between nodes of the embedded spatiality systems.

关键词： cascading failure multilayer network load distribution spatial network entropy

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A Staged Strategy for MMC Offshore Converter Station Under Asymmetric AC Fault 7

A Staged Strategy for MMC Offshore Converter Station Under A...

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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Li, Fangyuan Kou, Longze Zhou, Jiapei Hao, Jie State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of Dc Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China State Grid Shanxi Electric Power Company Electric Power Science Research Institute Shanxi China

ISBN: (纸本)9798350345094

At present, offshore wind power has become an important development direction for wind power generation. Offshore wind farms often use high-voltage direct current transmission technology with modular multi-level voltage source converters (MMC-HVDC) to transmit electricity to the grid. However, the fault response characteristics of offshore wind farms through the MMC-HVDC transmission system are different from those through AC transmission way. Therefore, it is significant that studying the fault ride through (FRT) technology of offshore wind farms through the MMC-HVDC grid connection system for practical engineering. An electromagnetic transient simulation model for an offshore wind farm composed of a direct drive permanent magnet synchronous generator (D-PMSG) connected to the grid is established through MMC-HVDC transmission technology. The mechanism and suppression strategy of overvoltage generation in the transmission network are provided during the fault clearance and recovery phase of the offshore wind farm HVDC transmission system under AC asymmetric faults. A two-stage improved control strategy for MMC-HVDC offshore converter station in response to asymmetric faults has been proposed, which is beneficial for the joint system to quickly recover from the post fault system voltage and suppress the overvoltage risk during the fault clearing phase. Finally, the proposed strategy is validated based on a domestic ± 500kV project in China, demonstrating its effectiveness. © 2023 IEEE.

关键词： Offshore wind farms

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Free vibration exploration of axially functionally graded carbon nanotube-reinforced beams through an innovative perturbative methodology 3

Free vibration exploration of axially functionally graded ca...

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2024 3rd International Conference on Aerospace, Aerodynamics and Mechatronics Engineering, AAME 2024

作者： Chen, Chen Zhou, Lilin Ye, Tianyu Li, Daokui College of Aerospace Science and Engineering National University of Defense Technology Hunan Changsha410073 China Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions Hunan Changsha410073 China Aviation Engineering Institute Civil Aviation Flight University of China Sichuan Guanghan618307 China

Axially functionally graded (AFG) carbon nanotube-reinforced composite (CNTRC) emerges as a promising solution for tailoring the stiffness and strength of various beam-like structures. Applications range from optimizing the weight-to-strength ratio of airplane wings to fine-tuning the frequency of micro-beam sensors, and even alleviating stresses induced by centrifugal forces or temperature gradients in turbine blades. However, the challenge of solving variable coefficient partial differential equations (VCPDEs) arising from the axial material gradient limits conventional methods to numerical and simulation techniques. In this study, a novel perturbation approach (PA) customized for AFG-CNTRC is highlighted for solving the problem analytically, simply, and precisely. First, the vibration model of an AFG-CNTRC beam is established according to the Euler-Bernoulli theory (EBT). Second, the vibration governing equations are solved by the PA and the state space method (SSM) analytically. Finally, the adaptivity and accuracy of the PA are validated and the effects of carbon nanotubes (CNTs) distribution patterns are analyzed. It is found that increasing CNT content at either end will increase the natural frequency for symmetric boundary conditions (BCs). The frequency decreases with the degree of nonlinearity distribution of CNTs. The frequency under the C-F BC exhibits low sensitivity to parameter effects. © Published under licence by IOP Publishing Ltd.

关键词： State space methods

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Direct evaluation of nuclear data uncertainty propagation in pebble-bed HTR core

Direct evaluation of nuclear data uncertainty propagation in...

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Physics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016

作者： Wang, Lidong Guo, Jiong Li, Fu Hao, Chen Ivanov, Kostadin Rouxelin, Pascal Institute of Nuclear and New Energy Technology Tsinghua University Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Beijing100084 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory College of Nuclear Science and Technology Harbin Engineering University Harbin China Department of Nuclear Engineering North Carolina State University RaleighNC27607 United States North Carolina State University United States

ISBN: (纸本)9781510825734

Due to the peculiarities of pebble-bed high temperature reactor (HTR), especially the movable core and double heterogeneity characteristics, a reliable uncertainty evaluation method that can take these peculiarities into account is urgently needed. In our work, the VSOP program is used for its effective treatments on the particularity of the pebble-bed HTR and the statistical sampling method is applied to quantify uncertainty propagation in the VSOP model. Since an on-line spectral calculation strategy without separable assembly spectral calculation is used in VSOP, the uncertainty propagation from nuclear data to core effective multiplication factor and power distribution can be directly evaluated. The results are compared to those of SCALE TSUNAMI-3D module for verification. Although the difference of keff between VSOP and TSUNAMI-3D calculation is ∼10%, primarily due to the lack of double heterogeneity treatment in TSUNAMI-3D, the uncertainty results obtained from the two calculations are in good agreement. In addition, the Direct Numerical Perturbation method is used to perform sensitivity analysis and the resulting sensitivity coefficients are consistent. The method proposed in this paper could be used to directly evaluate the effect of nuclear data uncertainty on core key parameters and to help determine pebble-bed HTR design margins.

关键词： Monte Carlo methods

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