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Journal of Materials Science & Technology 2020年第23期58卷 205-214页

作者： Shuo wang chi Zhang Xin Li Houbing Huang Junsheng wang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

The precipitation sequence in Al-Cu-Li alloys is sensitively dependent on the Cu/Li *** the low ratio Cu/Li alloys of 1-2.5,theδ'phases usually nucleate and grow from the 0'precipitates,formingδ'/θ'/δ'composite *** this work,we present a first-principle study on atomic structures and their relative stabilities of the growingδ'/θ'/δ'composite precipitates in Al-Cu-Li *** on the analysis of the interface formation energy,constituted interface and coherent strains energies,an"anti-phase1/2[110]"relationship for the oppositeδ'has been proposed when the inwardθ'has an odd number of *** may be achieved by translating one side of theδ'by 2(1/2)/2 a along the[110]slip direction,which is an energetically most favorable *** analyzing the bonding characteristics,both the"zigzag Al-Li combined with Cu"and the"zigzag Al-Al"interracial terminals are found to control the interface structure of the growingδ'/θ'/δ'.According to the calculated ideal tensile strength,the"anti-phase 1/2[110]"structure is most stable to some *** Li atoms at the interface enter decohesion mode along the applied strain,the stableδ'/θ'/δ'is prone to failure because of relatively weak Li-Al covalent ***,the really thin 8'in 8'/0'/8'composite precipitates may be explained by the continuous disassociation of Li atoms from the *** addition,a very weak Cu-Li covalent bond was suggested in theδ'/θ'/δ'composite *** is in sharp contrast to previous reports.

关键词： Al-Li alloys Precipitates Electronic properties First principles

Recent Progress in Mass Spectrometry-based Metabolomics for Colorectal Cancer

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Chemical Research in chinese Universities 2022年第4期38卷 886-893页

作者： XIAO Chulei chi Quan wang Xian Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission School of Chemistry and Materials ScienceSouth-Central Minzu UniversityWuhan430074P.R.China

Metabolomics,one of the latest omics technologies,is employed to reveal overall metabolic trajectories,identify disease causative mechanisms and provide information for preventive diagnosis and drug *** is a disease known to alter cellular metabolism and so metabolomics can play an important role in the early diagnosis of cancer and in the evaluation of medical interventions and treatments for *** metabolomics studies rely on high-sensitive and high-throughput mass spectrometry *** recent years,various mass spectrometry(MS)methodologies have been developed and enriched the scope of metabolite detection,contributing to disease studies,such as diabetes,cancer,and *** cancer is the third most diagnosed cancer worldwide and its incidence ranked third in *** review focuses on the mass spectrometry technologies in metabolomics and summarizes the progress of metabolomics research in colorectal cancer.

关键词： Metabolomics Mass spectrometry Colorectal cancer Biomarker

Experimental study on NO_x emission correlation of fuel staged combustion in a LPP combustor at high pressure based on NO-chemiluminescence

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chinese Journal of Aeronautics 2020年第2期33卷 550-560页

作者： Zhichao wang Yuzhen LIN Jianchen wang chi ZHANG Zhijun PENG National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Collaborative Innovation Center for Advanced Aero-EngineSchool of Energy and Power EngineeringBeihang UniversityBeijing 100083China Creative Arts Technologies and ScienceUniversity of BedfordshireLuton LU13JUUK

Experimental investigations on NOx emissions of a single-cup,Lean Premixed Prevaporized(LPP),module combustor were carried out at elevated inlet temperature and pressure up to810 K and 2.0 MPa,close to the real operating conditions of aero-engine *** LPP combustor adopts centrally staged fuel injections which could produce separated stratified swirling spray *** the NOx emissions measurements,the ranges of dome equivalence ratio and fuel stage ratio were from 0.55 to 0.58 and 8%to 24%,*** optical diagnosis on separated stratified swirling spray flame were carried out with fuel stage ratio changing from 15%to 30%.Therefore,NO*and OH*chemiluminescence images were *** results show that NOx emissions increase with the increase of the fuel stage *** from the chemiluminescence images,the main flame and pilot flame are found weakly *** pilot flame plays a significant role in NOx emission production because of its higher adiabatic flame *** on the results of chemiluminescence optical tests,a new NOx emission prediction model is proposed based on the Lefebvre’s single flame model The estimate of local equivalence ratio of the pilot stage’s nonpremixed flame is modified considering the characteristics of spray combustion,and a"PLUS"emission prediction model suitable for separated stratified swirling spray flame is *** to the experimental data,the"PLUS"model exhibits a good prediction in a range of±13%of deviation.

关键词： Combustors Lean staged combustion Low emissions NOx correlation Optical diagnosis

Research Advances of the chinese Meridian Project in 2020-2021

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空间科学学报 2022年第4期42卷 574-583页

作者： wang chi wang Jiangyan XU Jiyao State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190

The chinese Meridian Project(CMP)is a major national science and technology infrastructure invested and constructed by the chinese *** project builds space environment observation stations,focusing on the monitoring of the space environment over china,so as to provide a monitoring basis for clarifying the regional characteristics of the space environment over china and its relationship with global change,and making important innovative scientific *** first phase of the CMP passed the national acceptance in *** has been running for nearly ten years and has accumulated more than 8 TB monitoring *** data are all available to all data users through the data center of the *** 2020 to 2021,users of CMP data have completed a series of original works,which have solved current scientific problems in the field of space physics *** the other hand,they also make us look forward to the completion of the second phase of CMP and its application benefits in national major strategic needs and cutting-edge scientific research.

关键词： chinese Meridian Project(CMP) Space physics Magnetosphere Ionosphere Middle and upper atmosphere

Prediction of Partial Ring Current Index Using LSTM Neural Network

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空间科学学报 2022年第5期42卷 873-883页

作者： LI Hui wang Runze wang chi State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190 University of chinese Academy of Sciences Beijing 100049

The local time dependence of the geomagnetic disturbances during magnetic storms indicates the necessity of forecasting the localized magnetic storm *** the first time,we construct prediction models for the SuperMAG partial ring current indices(SMR-LT),with the advance time increasing from 1 h to 12 h by Long Short-Term Memory(LSTM)neural ***,the prediction performance decreases with the advance time and is better for the SMR-06 index than for the SMR-00,SMR-12,and SMR-18 *** the predictions with 12 h ahead,the correlation coefficient is 0.738,0.608,0.665,and 0.613,*** avoid the over-represented effect of massive data during geomagnetic quiet periods,only the data during magnetic storms are used to train and test our models,and the improvement in prediction metrics increases with the advance *** example,for predicting the storm-time SMR-06 index with 12 h ahead,the correlation coefficient and the prediction efficiency increases from 0.674 to 0.691,and from 0.349 to 0.455,*** evaluation of the model performance for forecasting the storm intensity shows that the relative error for intense storms is usually less than the relative error for moderate storms.

关键词： Geomagnetic storm Partial Ring Current Index(PRCI) Artificial Neural Network(ANN)

STRONG STABILITY PRESERVING PROPERTY OF THE DEFERRED CORRECTION TIME DISCRETIZATION

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Journal of Computational Mathematics 2008年第5期26卷 633-656页

作者： Yuan Liu chi-wang Shu Mengping Zhang Department of Mathematics University of Science and Technology of China Hefei 230026 China Division of Applied Mathematics Brown University Providence RI 02912 USA Department of Mathematics University of Science and Technology of China Hefei 230026 China

In this paper, we study the strong stability preserving （SSP） property of a class of deferred correction time discretization methods, for solving the method-of-lines schemes approximating hyperbolic partial differen... 详细信息

关键词： Strong stability preserving Deferred correction time discretization.

NUMERICAL BOUNDARY CONDITIONS FOR THE FAST SWEEPING HIGH ORDER WENO METHODS FOR SOLVING THE EIKONAL EQUATION

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Journal of Computational Mathematics 2008年第3期26卷 336-346页

作者： Ling Huang chi-wang Shu Mengping Zhang Department of Mathematics University of Science and Technology of China Hefei Anhui 230026 China Division of Applied Mathematics Brown University Providence RI 02912 USA Department of Mathematics University of Science and Technology of China Hefei 230026 China

High order fast sweeping methods have been developed recently in the literature to solve static Hamilton-Jacobi equations efficiently. Comparing with the first order fast sweeping methods, the high order fast sweeping methods are more accurate, but they often require additional numerical boundary treatment for several grid points near the boundary because of the wider numerical stencil. It is particularly important to treat the points near the inflow boundary accurately, as the information would flow into the computational domain and would affect global accuracy. In the literature, the numerical solution at these boundary points are either fixed with the exact solution, which is not always feasible, or computed with a first order discretization, which could reduce the global accuracy. In this paper, we discuss two strategies to handle the inflow boundary conditions. One is based on the numerical solutions of a first order fast sweeping method with several different mesh sizes near the boundary and a Richardson extrapolation, the other is based on a Lax-Wendroff type procedure to repeatedly utilizing the PDE to write the normal spatial derivatives to the inflow boundary in terms of the tangential derivatives, thereby obtaining high order solution values at the grid points near the inflow boundary. We explore these two approaches using the fast sweeping high order WENO scheme in [18] for solving the static Eikonal equation as a representative example. Numerical examples are given to demonstrate the performance of these two approaches.

关键词： Fast sweeping method WENO scheme Boundary condition

Damage Detection for CFRP Based on Planar Electrical Capacitance Tomography

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Structural Durability & Health Monitoring 2020年第4期14卷 303-314页

作者： Wenru Fan chi wang College of Electronic Information and Automation Civil Aviation University of ChinaTianjin300300China

Due to the widespread use of carbon fiber reinforced polymer/plastic(CFRP),the nondestructive structural health monitoring for CFRP is playing an increasingly essential *** a nonrad iative,noninvasive and nondestructive detection technique,planar electrical capacitance tomography(PECT)electrodes array is employed in this paper to reconstruct the damage image according to the calculated dielectric constant *** shape and duty ratio of PECT electro-des are optimized according to the relations between sensitivity distribution and the dielectric constant of different anisotropic *** sensitivity matrix of optimized PECT sensor is more uniform as the result shows,because the sensitiv-ity of insensitivity area can be increased by adding rotation of optimized *** reconstructed image qualities due to different PECT arrays and different damage locations are investigated at *** simulation results indicate that:PECT can be used to detect the surface damage of CFRP;the sensitivity matrix of PECT for CFRP is highly relevant with the degree of anisotropic dielectric con-stant;the rotatable PECT sensor with rotation has better performance in unifor-mity of sensitivity;for different damage locations,the rotatable sensor with rotation has better image quality in most cases.

关键词： Planar electrical capacitance tomography(PECT) carbon fiber reinforced polymer/plastic(CFRP) damage detection image reconstruction

Thermodynamic Performance Analysis of E/F/H-Class Gas Turbine Combined Cycle with Exhaust Gas Recirculation and Inlet/Variable Guide Vane Adjustment under Part-Load Conditions

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Journal of Thermal Science 2024年第1期33卷 348-367页

作者： LI Keying chi Jinling wang Bo ZHANG Shijie Key Lab of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of chinese Academy of Sciences Beijing 100049China School of Mechanical Electronic&Information Engineering China University of Mining&Technology-BeijingBeijing 100083China

Exhaust gas recirculation control(EGRC),an inlet air heating technology,can be utilized in combination with inlet/variable guide vane control(IGV/VGVC) and fuel flow control(FFC) to regulate the load,thereby effectively improving the part-load(i.e.,off-design) performance of the gas turbine combined cycle(GTCC).In this study,the E-,F-,and H-Class EGR-GTCC design and off-design system models were established and validated to perform a comparative analysis of the part-load performance under the EGR-IGV-FFC and conventional IGV-FFC strategies in the E/F/H-Class *** show that EGR-IGV-FFC has considerable potential for the part-load performance enhancement and can show a higher combined cycle efficiency than IGV-FFC in the E-,F-,and H-Class ***,the part-load performance improvement in the corresponding GTCC was weakened for the higher class of the gas turbine because of the narrower load range of EGR action and the deterioration of the gas turbine ***,EGR-IGV-FFC was inferior to IGV-FFC in improving the performance at loads below 50% for the H-Class *** results obtained in this paper could help guide the application of EGR-IGV-FFC to enhance the part-load performance of various classes of GTCC systems.

关键词： E/F/H-Class gas turbine combined cycle performance improvement part-load conditions exhaust gas recirculation inlet/variable guide vane

Eutectic Solution Enables Powerful Click Reaction for In-Situ Construction of Advanced Gel Electrolytes

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Energy & Environmental Materials 2023年第4期6卷 258-264页

作者： Weixin Ye Jirong wang chi Zhang Zhigang Xue Key Laboratory for Material Chemistry of Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Thiol-ene click reaction is an intriguing strategy for preparing polymer electrolytes due to its high activity,atom economy and less side ***,the explosive reaction rate and the use of non-electrolytic amine catalyst hamper its application in in-situ ***,a nitrogen-containing eutectic solution is designed as both the catalyst of the thiol-ene reaction and the plasticizer to in-situ synthesize the gel polymer electrolytes,realizing a mild in-situ gelation process and the preparation of high-performance gel *** obtained gel polymer electrolytes exhibit a high ionic conductivity of 4×10^(−4)S cm^(−1)and lithium-ion transference number(t_(Li)^(+))of 0.51 at 60°*** as-assembled Li/LiFePO_(4)(LFP)cell delivers a high initial discharge capacity of 155.9 mAh g^(-1),and a favorable cycling stability with the capacity retention of 82%after 800 cycles at 1 C is also *** addition,this eutectic solution significantly improves the rate performance of the LFP cell with high specific capacity of 141.5 and 126.8 mAh g^(-1)at 5 C and 10 C,respectively,and the cell can steadily work at various charge–discharge rate for 200 *** powerful and efficient strategy may provide a novel way for in-situ preparing gel polymer electrolytes with desirable comprehensive performances.

关键词： eutectic solution in-situ gelation lithium metal battery polymer electrolyte thiol-ene click reaction