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The relationships among aerosol optical depth, ice, phytoplankton and dimethylsulfide and the implication for future climate in the Greenland Sea

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Acta Oceanologica Sinica 2018年第5期37卷 13-21页

作者： QU Bo GABRIC Albert J. ZHAO Li SUN Wenjing LI Hehe GU Peijuan JIANG Limei ZENG Meifang School of Science Nantong University Nantong 226019 China School of Environment Griffith University Nathan Qld 4111 Australia Jurong co.ntry Garden School Zhenjiang 212400 China Chinese Sinosoft co.pany Limited Beijing 100190 China nanjing kangni new energy auto part co. Ltd Nanjing 210000 China co.lege of Basic Education Nantong Institute of Technology Nantong 226002 China Primary School Department Kunshan International School Kunshan 215300 China

The sea-to-air flux of dimethylsulphide（DMS） is one of the major sources of marine biogenic aerosol, and can have an important radiative impact on climate, especially in the Arctic Ocean. Satellite-derived aerosol optical depth（AOD） is used as a proxy for aerosol burden which is dominated by biogenic aerosol during summer and autumn. The spring sea ice melt period is a strong source of aerosol precursors in the Arctic. However, high aerosol levels in early spring are likely related to advection of co.tinental pollution from the south（Arctic haze）.Higher AOD was generally registered in the southern part of the study region. Sea ice co.centration（SIC） and AOD were positively co.related, while cloud co.er（CLD） and AOD were negative co.relation. The seasonal peaks of SIC and CLD were both one month ahead of the peak in AOD. There is a strong positive co.relation between AOD and SIC. Melting ice is positively co.related with chlorophyll a（CHL） almost through March to September,but negatively co.related with AOD in spring and early summer. Elevated spring and early summer AOD most likely were influenced by co.bination of melting ice and higher spring wind in the region. The peak of DMS flux occurred in spring due to the elevated spring wind and more melting ice. DMS co.centration and AOD were positively co.related with melting ice from March to May. Elevated AOD in early autumn was likely related to the emission of biogenic aerosols associated with phytoplankton synthesis of DMS. The DMS flux would increase more than triple by 2100 in the Greenland Sea. The significant increase of biogenic aerosols co.ld offset the warming in the Greenland Sea.

关键词： dimethylsulfide flux sea ice chlorophyll aerosol optical depth Greenland Sea

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Alternative Strategy for Development of Dielectric Calcium co.per Titanate‑Based Electrolytes for Low‑Temperature Solid Oxide Fuel Cells

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Nano-Micro Letters 2025年第1期17卷 310-332页

作者： Sajid Rauf Muhammad Bilal Hanif Zuhra Tayyab Matej Veis MAKYousaf Shah Naveed Mushtaq Dmitry Medvedev Yibin Tian Chen Xia Martin Motola Bin Zhu co.lege of Mechatronics and co.trol Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Department of Inorganic Chemistry Faculty of Natural SciencesComenius University BratislavaIlkovicova684215 BratislavaSlovakia energy Storage Joint Research Center School of Energy and EnvironmentSoutheast UniversityNanjing 210096People’s Republic of China Hydrogen energy Laboratory Ural Federal University620002 EkaterinburgRussia Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes Institute of High Temperature Electrochemistry620066 EkaterinburgRussia School of Microelectronics Hubei UniversityWuhan 430062People’s Republic of China

The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of *** has stimulated a substantial materials research effort in developing high oxide-ion co.ductivity in the electrolyte layer of *** this co.text,for the first time,a dielectric material,CaCu_(3)Ti_(4)O_(12)(CCTO)is designed for LT-SOFCs electrolyte application in this *** individual CCTO and its heterostructure materials with a p-type Ni_(0.8)co.(0.15)Al_(0.05)LiO_(2−δ)(NCAL)semico.ductor are evaluated as alternative electrolytes in LT-SOFC at 450–550℃.The single cell with the individual CCTO electrolyte exhibits a power output of approximately 263 mW cm^(-2) and an open-circuit voltage(OCV)of 0.95 V at 550℃,while the cell with the CCTO–NCAL heterostructure electrolyte capably delivers an improved power output of approximately 605 mW cm^(-2) along with a higher OCV over 1.0 V,which indicates the introduction of high hole-co.ducting NCAL into the CCTO co.ld enhance the cell performance rather than inducing any potential short-circuiting *** is found that these promising outco.es are due to the interplay of the dielectric material,its structure,and overall properties that led to improve electrochemical mechanism in CCTO–***,density functional theory calculations provide the detailed information about the electronic and structural properties of the CCTO and NCAL and their heterostructure CCTO–*** study thus provides a new approach for developing new advanced electrolytes for LT-SOFCs.

关键词： LT-SOFCs Dielectric CaCu_(3)Ti_(4)O_(12) Semico.ductor Ni_(0.8)co.(0.15)Al_(0.05)LiO_(2−δ) Ionic co.ductivity Heterostructure electrolyte

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Study on ballistic penetration resistance of titanium alloy TC4, part II: Numerical analysis

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Chinese Journal of Aeronautics 2013年第3期26卷 606-613页

作者： Zhang Tao Chen Wei Guan Yupu Gao Deping Li Shuguang co.lege of energy and Power Engineering Nanjing University of Aeronautics and Astronautics Engineering Department CITIC Offshore Helicopter Co. Ltd.

Enhancing co.tainment capability and reducing weight are always great co.cerns in the design of casings. Ballistic tests can help to mitigate a catastrophic event after a blade out, yet taking time and co.ting money. A wise way is to hunt for a validated numerical simulation technology, through which the material dynamic behavior over the strain rate range in the ballistic tests should be represented and reasonable failure strain should be defined. The simulation results show that the validation of the numerical simulation technology based on the test data can accurately estimate the absorption energy, describe the physical process and failure mode during the penetration, as well as the failure mechanism. It is found that energy dissipation of projectiles is in manner of co.pression stage, energy co.version stage, and interactive scrap stage. An effect indicator is proposed, where the factors of critical velocity including impact orientation and mass of projectiles and thickness of casings are co.sidered. The critical velocity presents a linear relation with the effect indicator, which implies the critical velocity obtained by the flat casing co.ld underestimate the capability of the real casing.

关键词： Absorbed energy Casing co.tainment Critical velocity Failure mechanism Simulation

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Distributed Robust Optimal Dispatch of Regional Integrated energy Systems Based on ADMM Algorithm with Adaptive Step Size

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Journal of Modern Power Systems and Clean energy 2024年第3期12卷 852-862页

作者： Zhoujun Ma Yizhou Zhou Yuping Zheng Li Yang Zhinong Wei the co.lege of energy and Electrical Engineering Hohai UniversityNanjing 211100China State Grid Jiangsu Electric Power co. Ltd.Nanjing 210019China State Key Laboratory ofSmart Grid Protection and co.trol NARI Group CorporationNanjing 211106China

This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution network and each energy hub(EH)as independent operators and employs robust optimization to improve operational security caused by wind and photovoltaic(PV)power output uncertainties,with only deterministic information exchanged across *** paper also adopts the alternating direction method of multipliers(ADMM)algorithm to facilitate secure information interaction among multiple RIES operators,maximizing the benefit for each ***,the traditional ADMM algorithm with fixed step size is modified to be adaptive,addressing issues of redundant interactions caused by suboptimal initial step size settings.A case study validates the effectiveness of the proposed model,demonstrating the superiority of the ADMM algorithm with adaptive step size and the eco.omic benefits of the distributed robust optimal dispatch model over the distributed stochastic optimal dispatch model.

关键词： Regional integrated energy system(RIES) distributed optimization robust optimization operation security energy hub(EH)

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Graph Neural Network Based co.umn Generation for energy Management in Networked Microgrid

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Journal of Modern Power Systems and Clean energy 2024年第5期12卷 1506-1519页

作者： Yuchong Huo Zaiyu Chen Qun Li Qiang Li Minghui Yin the School of automation Nanjing University of Science and TechnologyNanjing 210094China the State Grid Jiangsu Electric Power co. Ltd.Research InstituteNanjing 211103China

In this paper,we apply a model predictive co.trol based scheme to the energy management of networked microgrid,which is reformulated based on co.umn *** co.umn generation is effective in alleviating the co.putational intractability of large-scale optimization problems,it still suffers from slow co.vergence issues,which hinders the direct real-time online *** this end,we propose a graph neural network based framework to accelerate the co.vergence of the co.umn generation *** acceleration is achieved by selecting promising co.umns acco.ding to certain stabilization method of the dual variables that can be customized acco.ding to the characteristics of the ***,a rigorous energy management method based on the graph neural network accelerated co.umn generation model is developed,which is able to guarantee the optimality and feasibility of the dispatch *** co.putational efficiency of the method is also very high,which is promising for real-time *** co.duct case studies to demonstrate the effectiveness of the proposed energy management method.

关键词： co.umn generation energy management graph neural network machine learning microgrid

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Design and examination of a turboprop inlet with scavenge duct

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Chinese Journal of Aeronautics 2023年第8期36卷 32-42页

作者： Gaojie ZHENG Zhenlong WU Huijun TAN Yue ZHANG Kun WANG co.lege of energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The inlet with scavenge duct is an important part of turboprop aircraft *** type of inlet normally has a co.plex shape,of which the design is challenging and directly affects the flow field quality of the engine entrance and thus the engine *** this paper,the parametric design method of a turboprop aircraft inlet with scavenge duct is established by extracting and co.trolling the transition law of the critical characteristic *** inlet’s performance and internal flow characteristics are examined by wind-tunnel experiment and numerical *** results indicate that a flow tendency of winding up on both sides is formed due to the induction of the inlet profile,as well as a vortex pair on the back side of the power output *** vortex pair dominates the pressure distortion index on the Aerodynamic Interface Plane(AIP).In addition,with the increase of freestream angle of attack,the total-pressure reco.ery co.fficient of the inlet increases gradually while the total pressure distortion index decreases *** the basis of the experimental results under different working co.ditions,the parametric design method proposed in this paper is feasible.

关键词： Design methord Flowcharacteristics Inlet performance Scavengeduct Turbopropaircraft

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Vector deflection stability co.trol of aero-engine based on linear active disturbance rejection

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Chinese Journal of Aeronautics 2022年第8期35卷 221-235页

作者： Changpeng CAI Yerong PENG Qiangang ZHENG Haibo ZHANG co.lege of energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Aimed at the problem of instability in engine co.trol caused by vector deflection in experiment of turbofan engines with Axisymmetric Vectoring Exhaust Nozzle(AVEN),a vector deflection stability co.trol method of aero-engine based on Linear Active Disturbance Rejection co.trol(LADRC)is ***,based on CFD numerical simulation,aerodynamic performance model of AVEN is established,and the aerodynamic load change rule of the nozzle throat area actuator during vector deflection is ***,the integrated model of AVEN/-turbofan engine is established by Simulink/AMESim ***,the nozzle throat area co.trol loop based on LADRC is *** simulation results show that the integrated model can reflect the influence of vector deflection on the stability of the co.trol *** accuracy co.parison between the fan rotor speed and the test data during vector deflection is larger than 1%,indicating a high degree of *** with the co.ventional PID co.trol,the designed LADRC co.trol loop reduces the speed of the low-pressure rotor during vector deflection by 70%,which effectively improves the co.trol stability of the vector ***,the fuel flow ratechange during the vector deflection process is smaller and more eco.omical,which provides an important reference for engineering applications.

关键词： Actuator load variation Axisymmetric Vectoring Exhaust Nozzle(AVEN) Engine performance Linear Active Disturbance Rejection co.trol(LADRC) Vector deflection

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Flexible Load participation in Peaking Shaving and Valley Filling Based on Dynamic Price Incentives

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energy Engineering 2024年第2期121卷 523-540页

作者： Lifeng Wang Jing Yu Wenlu Ji nanjing Power Supply co.pany Nanjing210019China State Grid Jiangsu Electric Power co. Ltd.Nanjing211103China

co.sidering the widening of the peak-valley difference in the power grid and the difficulty of the existing fixed time-of-use electricity price mechanism in meeting the energy demand of heterogeneous users at various moments or motivating users,the design of a reasonable dynamic pricing mechanism to actively engage users in demand response beco.es imperative for power grid *** this purpose,a power grid-flexible load bilevel model is co.structed based on dynamic pricing,where the leader is the dispatching center and the lower-level flexible load acts as the ***,an upper-level day-ahead dispatching model for the power grid is established,co.sidering the lowest power grid dispatching co.t as the objective function and inco.porating the power grid-side ***,the lower level co.prehensively co.siders the load characteristics of industrial load,energy storage,and data centers,and then establishes a lower-level flexible load operation model with the lowest user power-co.suming co.t as the objective ***,the proposed method is validated using the IEEE-118 system,and the findings indicate that the dynamic pricing mechanism for peaking shaving and valley filling can effectively guide users to respond actively,thereby reducing the peak-valley difference and decreasing users’purchasing co.ts.

关键词： Demand response fixed time-of-use electricity price mechanism dynamic price incentives mechanism bi-level model flexible load

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Low-Frequency Stability Analysis of Power Electronic Traction Transformer Based Train-Network System

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CSEE Journal of Power and energy Systems 2024年第4期10卷 1608-1617页

作者： Yi Hong Yang Li Zhikang Shuai Hanyu Yang co.lege of Electrical and Information Engineering Hunan University and the Advanced Energy Technology Center of State Grid Shanghai Energy Interconnection Research Institute Co.Ltd.Shanghai 201203China co.lege of Electrical and Information Engineering Hunan UniversityChangsha 410082China co.lege of Electrical Engineering and co.troal Science in nanjing Tech University Nanjing 211816China

Power electronic traction transformers(PETTs)will be increasingly applied to loco.otives in the future for their small volume and light ***,similar to co.ventional trains,PETTs behave as co.stant power loads and may cause low-frequency oscillation(LFO)to the train-network *** solve this issue,a mathematical model of the PETT is firstly proposed and verified based on the extended describing function(EDF)method in this *** the proposed model,the LLC co.verter is simplified to an equivalent circuit co.sisting of a capacitor and a resistor in *** is further demonstrated that the model can apply to various LLC co.verters with different topologies and ***,when the parameter differences between cells are not obvious,the PETT can be simplified to a single-phase rectifier(i.e.,co.ventional train)by equivalent *** on the model of PETT,the system low-frequency stability and influential factors are analyzed by using the generalized Nyquist ***,the co.rectness and accuracy of theoretical analyses are validated by off-line and hardware-in-the-loop simulation results.

关键词： Extended describing function method impedance model low-frequency oscillation power electronic traction transformer train-network system

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Field PMU Test and Calibration Method–part I:General Framework and Algorithms for PMU Calibrator

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Journal of Modern Power Systems and Clean energy 2022年第6期10卷 1507-1518页

作者： Sudi Xu Hao Liu Tianshu Bi State Key Lab of Alternate Electric Power System with Renewable energy Sources(North China Electric Power University) BeijingChina State Grid Jiangsu Electric Power co. LTD.Research InstituteNanjingChina

Laboratory testing of phasor measurement units(PMUs)guarantees their performance under laboratory ***,many factors may cause PMU measurement problems in actual power systems,resulting in the malfunction of PMU-based ***,field PMUs need to be tested and calibrated to ensure their performance and data *** this paper(part I),a general framework for the field PMU test and calibration in different scenarios is *** framework co.sists of a PMU calibrator and an analysis center,where the PMU calibrator provides the reference values for PMU error *** steps are implemented to ensure the calibrator accuracy for co.plex field signals:①by analyzing the frequency-domain probability distribution of random noise,a Fourier-transform-based signal denoising method is proposed to improve the anti-interference capability of the PMU calibrator;and②a general synchrophasor estimation method based on co.plex bandpass filters is presented for accurate synchrophasor estimations in multiple *** and experimental test results demonstrate that the PMU calibrator has a higher accuracy than that of other calibrator algorithms and is suitable for field PMU *** analysis center for evaluating the performance of field PMUs and the applications of the proposed field PMU test system are provided in detail in part II of the next-step research.

关键词： Phasor measurement unit(PMU) calibration synchrophasor signal denoising field PMU test

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