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Mission segment division of the whole aeroengine loading spectrum based on flight actions

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Chinese Journal of Aeronautics 2022年第2期35卷 164-174页

作者： Yu JIN Zhigang SUN Yingdong SONG Xin LIN Xuming NIU junjie ding Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Aero-engine Thermal Environment and StructureMinistry of Industry and Information TechnologyNanjing 210016China State Key Laboratory of Mechanics and Control Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

This paper studies on a division method of the whole aeroengine loading spectrum flight mission segment and rotor speed mission segment,which is based on the actual flight actions and related to the flight operations of aeroengine and is suitable for the variable-speed aeroengines such as turbojet and *** the research,the aeroengine loading spectrum operation-related mission segments can be divided,which can provide important data basis for the life research on the structures which are sensitive to flight maneuver(such as the main shaft,large gearbox and installation section),lay a foundation for the simulation,compilation and prediction of the whole aeroengine loading ***,based on the summary of basic flight actions in actual flight,the division of flight mission segment was realized by ***,the aeroengine rotor speed mission segments,associated with flight actions and missions,were divided based on the flight mission segment division ***,the efficiency and accuracy of the mission segment division results were verified by adopting measured loading spectrum ***,the characteristics of speed mission segment division results were compared and analyzed in tables and *** comparison results show that the characteristics of similar speed mission segments are similar,while the characteristics of different speed mission segments are *** the shapes of similar mission segments vary to the change of flight actions and operations,which can reflect the operation-related feature of the segments.

关键词： Aircraft engine Flight mission segment Mission segment division Rotor speed mission segment Spectrum analysis

Investigating the failure mechanism of solid electrolyte interphase in silicon particles from an electrochemical-mechanical coupling perspective

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Advanced Powder Materials

Advanced Powder Materials 2024年第4期3卷 27-35页

作者： junjie ding Xueyan Li Lili Gong Peng Tan Department of Thermal Science and Energy Engineering University of Science and Technology of China(USTC)Hefei230026China State Key Laboratory of Fire Science University of Science and Technology of China(USTC)Hefei230026China

Silicon is considered one of the most promising anode materials owing to its high theoretical energy density,however,the volume expansion/contraction during electrochemical lithiation/delithiation cycles leads to instability of the solid electrolyte interphase(SEI),which ultimately results in capacity ***,the local stress and deformation evolution status of an SEI layer on an anode particle are investigated through a quantitative electrochemical-mechanical *** impacts of structural uniformity,mechanical strength,and operating conditions on the stability of the SEI layer are investigated in *** simulation results demonstrate that when the silicon particle radius decreases from 800 nm to 600 and 400 nm,the failure time increases by 29%and 65%,respectively,of the original failure time;When the structural defect depth ratio is reduced from 0.6 to 0.4 and 0.2,the failure time increases by 72%and 132%,respectively;For the discharge rate,the condition at 0.1 C has 34%and 139%longer time to failure than that at 0.2 C and 0.3 C,*** work provides insight into the rational design of stable SEI layers and sheds light on possible methods for constructing silicon-based lithium-ion batteries with longer cycling lives.

关键词： Solid electrolyte interface Silicon electrode Structural failure Lithium-ion battery Modeling and simulation

High spectral efficiency 4-mode 400-km transmission using hybrid probabilistically and geometrically shaped 128QAM

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Science China(Technological Sciences) 2024年第5期67卷 1628-1630页

作者： ding junjie YU JianJun WANG Chen LONG JianYu ZHU Min ZHANG Jiao Pervasive Communication Research Center Purple Mountain LaboratoriesNanjing 211111China Key Laboratory for Information Science of Electromagnetic Waves(MoE) Fudan UniversityShanghai 200433China

Wavelength division multiplexing(WDM)and space division multiplexing(SDM)based on few-mode fiber(FMF)and multi-core fiber(MCF)have been vigorously developed to increase the transmission capacity of optical communication networks[1–5].However,the mode crosstalk generated in the mode division multiplexing(MDM)system causes the correlation between different mode signals,which seriously damages the transmission ***,an effective multiple-input-multiple-output(MIMO)time domain or frequency domain equalizer should be used to eliminate the crosstalk between different mode signals.

关键词： crosstalk fiber multiplexing

Recent progress on lanthanide complexes/clay minerals hybrid luminescent materials

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Journal of Rare Earths 2022年第9期40卷 1360-1370,I0001页

作者： Ga Zhang Lefu Mei junjie ding Ke Su Qingfeng Guo Guocheng Lv Libing Liao Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China School of Gemmology China University of GeosciencesBeijing 100083China

The unique luminescent performance of lanthanide complexes/clay minerals hybrid materials has been fascinating many researchers for recent *** not only retains the excellent luminescent characteristics of lanthanide complexes but also improves the poor stability of the *** this article,we introduce the luminescence mechanism of lanthanide complexes and point out the necessity of their combination with clay *** the analysis of the structure and interlayer environment differences of 1:1-type and 2:1-type clay minerals,the intercalation methods(covalent grafting and ion exchange)appropriate for different clay minerals are summarized with *** on the luminescence characteristics of the hybrid materials,the applications of these materials as luminescent probes in recognition of specific metal cations and molecules,detection of pH value,and temperature are ***,the current problems in the preparation of lanthanide complexes/clay minerals hybrid luminescent materials and shortcomings that need improvement in their performance are analyzed,and the application prospect is forecast.

关键词： Luminescence Hybrid materials Lanthanide complexes Clay minerals Luminescent probes Rare earths

Construction of rhombic triacontahedron discrete global grid systems

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International Journal of Digital Earth 2022年第1期15卷 1760-1783页

作者： Xiaoyu Liang Jin Ben Rui Wang Qishuang Liang Xinhai Huang junjie ding PLA Strategic Support Force Information Engineering University ZhengzhouPeople’s Republic of China

Discrete Global Grid System(DGGS)is a new multi-resolution geospatial data modeling and processing scheme for the digital *** icosahedron is commonly regarded as an ideal polyhedron for constructing DGGSs with small distortions;however,the shape of its face is triangular,making it difficult to incorporate the matrix structure used for geospatial data storage and parallel *** overcome this limitation,this study utilizes the rhombic triacontahedron(RT)as the basic polyhedron to construct *** equal-area projection between the surface of RT and the sphere is developed and used to design a grid-generation algorithm for the aperture 4 hexagonal DGGS based on *** with the equal-area DGGS based on the icosahedron,the proposed scheme results in smaller angular projection distortions,with the mean and standard deviation decreasing by 41.6%and 30.9%,*** grid cells of the RT DGGS also achieve more optimized geometric characteristics in shape compactness,length deviation,and angle deviation than those in the icosahedron ***,the cross-surface computation efficiency provides advantages in code conversion to latitude and longitude and proximity ***,the use of RT offers a new and better framework within the context of DGGS research and application.

关键词： Discrete global grid system rhombic triacontahedron equal-area projection hexagon

Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH Solutions at Ampere‑Level Current

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Nano-Micro Letters 2024年第3期16卷 212-226页

作者： Min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han junjie ding Li‑Yong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy Storage Materials and Equipment Chongqing 401135People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 M pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/Sn-SnO_(2)nanosheets Electronic structure Porous solid electrolyte Pure

Record 50.7-Tbit/s WDM coherent transmission in hollow-core fiber

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Science China(Technological Sciences) 2023年第9期66卷 2755-2756页

作者： ZHU BoWen WANG CaoYuan ZHU Jie WEI Yi ding junjie ZHAI ZhenDe XIAO LiMin YU JianJun School of Information Science and Technology Fudan UniversityShanghai 200433China Shenzhen Sublime Photonics Co. Ltd.Shenzhen 518109China

Over the past half-century, the emergence of technologies such as erbium-doped fiber amplifier(EDFA), wavelength division multiplexing(WDM), coherent transmission and advanced digital signal processing(DSP) has led to... 详细信息

关键词： fiber WDM amplifier

352-Gbit/s single line rate THz wired transmission based on PS-4096QAM employing hollow-core fiber

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Digital Communications and Networks 2023年第3期9卷 717-722页

作者： junjie ding Yuxuan Tan Yanyi Wang Jiao Zhang Menghui He Feng Zhao Li Zhao Wen Zhou Yiwei Shi Min Zhu Jianjun Yu Key Laboratory for Information Science of Electromagnetic Waves(MOE) Fudan UniversityShanghaiChina Purple Mountain Laboratories NanjingJiangsuChina Xian University of Posts and Telecommunications XianShanxiChina

We successfully demonstrate 32-Gbaud Probabilistically Shaped 4096-ary Quadrature Amplitude Modulation(PS-4096QAM)TeraHertz(THz)signal wired transmission at 325 GHz over the 1-m Hollow-Core Fiber(HCF)in a photon-assisted THz-wave communication *** employing advanced Digital Signal Processing(DSP)and the PS technique,the 352-Gbit/s line rate(288-Gbit/s net rate)delivery with a net Spectral Efficiency(SE)of 9 bit/s/Hz is realized in the experiment,satisfying the 0.86-Normalized Generalized Mutual Information(NGMI)Low-Density Parity-Check(LDPC)threshold.

关键词： Hollow-core fiber Terahertz-wave communication Photonics-aided scheme Probabilistic shaping

Enhanced Electrical Properties of Bi_(2−x)Sb_(x)Te_(3) Nanoflake Thin Films Through Interface Engineering

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Energy & Environmental Materials 2024年第6期7卷 359-366页

作者： Xudong Wu junjie ding Wenjun Cui Weixiao Lin Zefan Xue Zhi Yang Jiahui Liu Xiaolei Nie Wanting Zhu Gustaaf Van Tendeloo Xiahan Sang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China EMAT(Electron Microscopy for Materials Science) University of AntwerpGroenenborgerlaan 171Antwerp 2023Belgium

The structure–property relationship at interfaces is difficult to probe for thermoelectric materials with a complex interfacial *** thermoelectric materials with a simple,structurally-uniform interface provides a facile way to understand how these interfaces influence the transport ***,we synthesized Bi_(2−x)Sb_(x)Te_(3)(x=0,0.1,0.2,0.4)nanoflakes using a hydrothermal method,and prepared Bi_(2−x)Sb_(x)Te_(3) thin films with predominantly(0001)interfaces by stacking the nanoflakes through spin *** influence of the annealing temperature and Sb content on the(0001)interface structure was systematically investigated at atomic scale using aberration-corrected scanning transmission electron *** and Sb doping facilitate atom diffusion and migration between adjacent nanoflakes along the(0001)*** such it enhances interfacial connectivity and improves the electrical transport *** reactions create new interfaces that increase the scattering and the Seebeck *** to the simultaneous optimization of electrical conductivity and Seebeck coefficient,the maximum power factor of the Bi_(1.8)Sb_(0.2)Te_(3) nanoflake films reaches 1.72 mW m^(−1)K^(−2),which is 43%higher than that of a pure Bi_(2)Te_(3) thin film.

关键词： Bi_(2)Te_(3) nanoflakes interface engineering scanning transmission electron microscopy thermoelectric thin film