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Overview of multi-stage charging strategies for Li-ion batteries

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Journal of Energy Chemistry 2023年第9期84卷 228-241页

作者： muhammad Usman Tahir Ariya Sangwongwanich Daniel-Ioan Stroe Frede Blaabjerg aau Energy Aalborg UniversityAalborg DK-9220Denmark

To reduce the carbon footprint in the transportation sector and improve overall vehicle efficiency,a large number of electric vehicles are being *** is due to the fact that environmental concerns and the depletion of fossil fuels have become significant global ***-ion batteries(LIBs)have been distinguished themselves from alternative energy storage technologies for electric vehicles(EVs) due to superior qualities like high energy and power density,extended cycle life,and low maintenance cost to a competitive ***,there are still certain challenges to be solved,like EV fast charging,longer lifetime,and reduced *** fast charging,the multi-stage constant current(mSCC) charging technique is an emerging solution to improve charging efficiency,reduce temperature rise during charging,increase charging/discharging capacities,shorten charging time,and extend the cycle ***,there are large variations in the implementation of the number of stages,stage transition criterion,and C-rate selection for each *** paper provides a review of these problems by compiling information from the *** overview of the impact of different design parameters(number of stages,stage transition,and C-rate) that the mSCC charging techniques have had on the LIB performance and cycle life is described in detail and *** impact of design parameters on lifetime,charging efficiency,charging and discharging capacity,charging speed,and rising temperature during charging is presented,and this review provides guidelines for designing advanced fast charging strategies and determining future research gaps.

关键词： multi-stage constant current(mSCC)charging Electric vehicles(EVs) Li-ion batteries(LIBs) Fast charging strategies

On the Well-Posedness for Stochastic Schrodinger Equations with Quadratic Potential

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Chinese Annals of mathematics,Series B 2011年第5期32卷 711-728页

作者： Daoyuan FANG Linzi ZHANG Ting ZHANG Department of mathematics Zhejiang University Hangzhou 310027 China corresponding author. Department of mathematics Zhejiang University Hangzhou 310027 China Corresponding author. Department of Mathematics Zhejiang University Hangzhou 310027 China Corresponding author. Department of Mathematics Zhejiang University Hangzhou 310027 China Corresponding author. Department of Mathematics Zhejiang University Hangzhou 310027 China Corresponding author. Department of Mathematics Zhejiang University Hangzhou 310027 China Corresponding author. Department of Mathematics Zhejiang University Hangzhou 310027 China

The authors investigate the influence of a harmonic potential and random perturbations on the nonlinear Schr6dinger equations. The local and global well-posedness are proved with values in the space ∑（R^n）={f E HI（R^n）, ｜·｜f ∈ L^2（R^n）}. When the nonlinearity is focusing and L2-supercritical, the authors give sufficient conditions for the solutions to blow up in finite time for both confining and repulsive potential. Especially for the repulsive case, the solution to the deterministic equation with the initial data satisfying the stochastic blow-up condition will also blow up in finite time. Thus, compared with the deterministic equation for the repulsive case, the blow-up condition is stronger on average, and depends on the regularity of the noise. If φ = 0, our results coincide with the ones for the deterministic equation.

关键词： Stochastic SchrSdinger equation Well-posedness Blow up

Elevated temperature creep model of parallel wire strands

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 1060-1071页

作者： Yong DU Yongjin WU Abdullahi m.UmAR Shaojun ZHU College of Civil Engineering Nanjing Tech UniversityNanjing 211816China College of Civil Engineering Tongji UniversityShanghai 200092China*Corresponding author.E-mail:zhushaojun@***

T Parallel wire strands(PWSs),which are widely used in prestressed steel structures,are typically in highstress *** fire conditions,significant creep effects occur,reducing the prestress and influencing the mechanical behavior of *** there is no existing approach to analyze their creep behavior,this study experimentally investigated the elevated temperature creep model of PWSs.A charge-coupled camera system was incorporated to accurately obtain the deformation of the specimen during the elevated temperature creep *** was concluded that the temperature level had a more significant effect on the creep strain than the stress level,and 450℃ was the key segment point where the creep rate varied *** comparing the elevated temperature creep test results for PWSs and steel strands,it was found that the creep strain of PWSs was lower than that of steel strands at the same temperature and stress *** parameters in the general empirical formula,the Bailey–Norton model,and the composite timehardening model were fitted based on the experimental *** evaluating the accuracy and form of the models,the composite time-hardening model,which can simultaneously consider temperature,stress,and time,is recommended for use in the fire-resistance design of pre-tensioned structures with PWSs.

关键词： parallel wire strands experimental study elevated temperature creep model

Nonexistence of a Globally Stable Supersonic Conic Shock Wave for the Steady Supersonic Isothermal Euler Flow

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Chinese Annals of mathematics,Series B 2013年第4期34卷 557-574页

作者： Yuchen LI Gang XU Department of mathematics & ImS Nanjing University corresponding author. Department of mathematics Jiangsu University

In this paper, for the full Euler system of the isothermal gas, we show that a globally stable supersonic conic shock wave solution does not exist when a uniform supersonic incoming flow hits an infinitely long and cu... 详细信息

关键词： Supersonic flow Conic shock Full Euler system Isothermal gas Nonexistence

Power Electronics:The Enabling technology for Renewable Energy Integration

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CSEE Journal of Power and Energy Systems 2022年第1期8卷 39-52页

作者： Zhongting Tang Yongheng Yang Frede Blaabjerg aau energy Aalborg UniversityAalborg DK-9220Denmark College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

The markedly increased integration of renewable energy in the power grid is of significance in the transition to a sustainable energy *** grid integration of renewables will be continuously enhanced in the *** to the International Renewable Energy Agency(IRENA),renewable technology is the main pathway to reach zero carbon dioxide(CO_(2))emissions by *** electronics have played and will continue to play a significant role in this energy transition by providing efficient electrical energy conversion,distribution,transmission,and ***,the development of power electronics technologies,i.e.,new semiconductor devices,flexible converters,and advanced control schemes,is promoted extensively across the *** various renewables,wind energy and photovoltaic(PV)are the most widely used,and accordingly these are explored in this paper to demonstrate the role of power *** development of renewable energies and the demands of power electronics are reviewed ***,the power conversion and control technologies as well as grid codes for wind and PV systems are *** trends in terms of power semiconductors,reliability,advanced control,grid-forming operation,and security issues for largescale grid integration of renewables,and intelligent and full user engagement are presented at the end.

关键词： Advanced control grid codes grid integration photovoltaic system power electronics reliability wind turbine system

Blowup Criteria for Full Compressible Navier-Stokes Equations with Vacuum State

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Chinese Annals of mathematics,Series B 2017年第3期38卷 741-758页

作者： Yongfu WANG Shan LI School of Economic mathematics Southwestern University of Finance and Economics corresponding author. Business College Sichuan University

This paper deals with the global strong solution to the three-dimensional(3D)full compressible Navier-Stokes systems with vacuum. The authors provide a sufficient condition which requires that the Sobolev norm of the temperature and some norm of the divergence of the velocity are bounded, for the global regularity of strong solution to the 3D compressible Navier-Stokes equations. This result indicates that the divergence of velocity fields plays a dominant role in the blowup mechanism for the full compressible Navier-Stokes equations in three dimensions.

关键词： Compressible Navier-Stokes equations Heat-conduction Blowup criterion Divergence of velocity

On the Error Estimate of the Harmonic B_z Algorithm in mREIT from Noisy magnetic Flux Field

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Chinese Annals of mathematics,Series B 2014年第3期35卷 319-336页

作者： Qun CHEN Jijun LIU College of mathematics and Statistics Nanjing University of Information Science and Technology corresponding author. Department of mathematics Southeast University

Abstract magnetic resonance electrical impedance tomography （mREIT, for short） is a new medical imaging technique developed recently to visualize the cross-section conduc- tivity of biologic tissues. A new mREIT image reconstruction method called harmonic Bz algorithm was proposed in 2002 with the measurement of Bz that is a single component of an induced magnetic flux density subject to an injection current. The key idea is to solve a nonlinear integral equation by some iteration process. This paper deals with the convergence analysis as well as the error estimate for noisy input data Bz, which is the practical situation for mREIT. By analyzing the iteration process containing the Laplacian operation on the input magnetic field rigorously, the authors give the error estimate for the iterative solution in terms of the noisy level 6 and the regularizing scheme for determining ABz approximately from the noisy input data. The regularizing scheme for computing the Laplacian from noisy input data is proposed with error analysis. Our results provide both the theoretical basis and the implementable scheme for evaluating the reconstruction accuracy using harmonic Bz algorithm with practical measurement data containing noise.

关键词： mREIT Image reconstruction Iteration Error estimate

Single-layer graphene as a highly selective barrier for vanadium crossover with high proton selectivity

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Journal of Energy Chemistry 2021年第8期30卷 419-430,I0009页

作者： Saheed Bukola Zhaodong Li Jason Zack Christopher Antunes Carol Korzeniewski Glenn Teeter Jeffrey Blackburn Bryan Pivovar National Renewable Energy Laboratory(NREL) 80401 GoldenUnited States Department of Chemistry Texas Tech University79409 LubbockUnited States*Corresponding author(email:Saheed.Bukola@nrel.gov

We report near-zero crossover for vanadium cross-permeation through single-layer graphene immobilized at the interface of two Nafion?polymer electrolyte *** ion diffusion and migration,including proton mobility through membrane composites,were studied with and without graphene under diffusion and migration ***-layer graphene was found to effectively inhibit vanadium ion diffusion and migration under specific *** single-layer graphene composites also enabled remarkable ion transmission selectivity improvements over pure Nafion membranes,with proton transport being four orders of magnitude faster than vanadium ion *** values of 0.02±0.005Ωcm^(2) for proton and 223±4Ωcm^(2) for vanadium ion through single atomic layer graphene are *** high selectivity may have significant impact on flow battery applications or for other electrochemical devices where proton conductivity is required,and transport of other species is *** results emphasize that crossover may be essentially completely eliminated in some cases,enabling for greatly improved operational viability.

关键词： Ion selectivity Polymer electrolyte membrane Redox flow battery Single-layer graphene Vanadium crossover 2D nanomaterial

Small molecule inhibitor DDQ-treated hippocampal neuronal cells show improved neurite outgrowth and synaptic branching

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Neural Regeneration Research 2025年第9期20卷 2624-2632页

作者： Jangampalli Adi Pradeepkiran Priyanka Rawat Arubala P.Reddy Erika Orlov PHemachandra Reddy Department of Internal medicine Texas Tech University Health Sciences CenterLubbockTXUSA Department of Nutritional Sciences College of Human SciencesTexas Tech UniversityLubbockTXUSA Department of Pharmacology&Neuroscience Texas Tech University Health Sciences CenterLubbockTXUSA Department of Neurology Texas Tech University Health Sciences CenterLubbockTXUSA Department of Speech Language and Hearing SciencesTexas Tech University Health Sciences CenterLubbockTXUSA Department of Public Health Texas Tech University Health Sciences CenterLubbockTXUSA

The process of neurite outgrowth and branching is a crucial aspect of neuronal development and *** and dendrites,sometimes referred to as neurites,are extensions of a neuron's cellular body that are used to start *** we explored the effects of diethyl(3,4-dihydroxyphenethylamino)(quinolin-4-yl)methylphosphonate(DDQ)on neurite developmental features in HT22 neuronal *** this work,we examined the protective effects of DDQ on neuronal processes and synaptic outgrowth in differentiated HT22cells expressing mutant Tau(mTau)*** investigate DDQ chara cteristics,cell viability,biochemical,molecular,western blotting,and immunocytochemistry were *** outgrowth is evaluated through the segmentation and measurement of neural *** neural processes can be seen and measured with a fluorescence microscope by manually tracing and measuring the length of the neurite *** neuronal processes can be observed and quantified with a fluorescent microscope by manually tracing and measuring the length of the neuronal ***-treated mTau-HT22 cells(HT22 cells transfected with cDNA mutant Tau)were seen to display increased levels of synaptophysin,mAP-2,andβ-***,we confirmed and noted reduced levels of both total and p-Tau,as well as elevated levels of microtubule-associated protein 2,β-tubulin,synaptophysin,vesicular acetylcholine transporter,and the mitochondrial biogenesis protein-pe roxisome prolife rator-activated receptor-gamma coactivator-1α.In mTa u-expressed HT22 neurons,we observed DDQ enhanced the neurite characteristics and improved neurite development through increased synaptic *** findings conclude that mTa u-HT22(Alzheimer's disease)cells treated with DDQ have functional neurite developmental chara *** key finding is that,in mTa u-HT22 cells,DDQ preserves neuronal structure and may even enhance nerve development function with mTa u inhibition.

关键词： diethyl(3 4-dihydroxyphenethylamino)(quinolin-4-yl)methylphosphonate(DDQ) hippocampal neuronal cells HT22 neurite outgrowth neuronal development small molecule