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Development and Analysis of a New Cylindrical Lithium-Ion Battery Thermal management System

Chinese Journal of Mechanical Engineering 2022年第4期35卷 298-312页

作者： Yasong Sun Ruihuai Bai jing ma School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Center of Computational Physics and Energy Science Yangtze River Delta Research Institute of NPUNorthwestern Polytechnical UniversityTaicang 215400China School of Automobile Chang’an UniversityXi’an 710064China

With the development of modern technology and economy,environmental protection and sustainable development have become the focus of global *** promotion and development of electric vehicles(EVs)have bright ***,many challenges need to be faced *** diferent operating conditions,various safety problems of electric vehicles emerge one after another,especially the hidden danger of battery overheating which threatens the performance of electric *** paper aims to design and optimize a new indirect liquid cooling system for cylindrical lithium-ion *** design schemes for diferent cooling channel structures and cooling liquid inlet directions are proposed,and the corresponding solid-fuid coupling model is *** Multiphysics simulation software is adopted to simulate and analyze the cooling *** approximate model is constructed using the Kriging method,which is considered to optimize the battery cooling system and improve the optimization *** parameter analysis and the optimization design of system structure are performed through a set of infuencing factors in the battery thermal *** results indicate that the method used in this paper can efectively reduce the maximum core temperature and balance the temperature diferences of the battery *** with the original design,the optimized design,which is based on the non-dominated sorting genetic algorithm(NSGA-II),has an excellent ability in the optimized thermal management system to dissipate thermal energy and keep the overall cooling uniformity of the battery and thermal management ***,the optimized system can also prevent thermal runaway propagation under thermal abuse *** summary,this research can provide some practical suggestions and ideas for the engineering and production applications and structural optimization design carried by electric vehicles.

关键词： Cooling system Electric vehicle Kriging approximation Numerical simulation

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Facile interconversions of topology and aromaticity of expanded porphyrin in solution

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Science China Chemistry 2014年第10期57卷 1369-1374页

作者： LIU ZeYu ma jing Key Laboratory of Mesoscopic Chemistry Ministry of Education School of Chemistry and Chemical Engineering Nanjing University Sericultural Research Institute Jiangsu University of Science and Technology

The dynamic transformations of conformations and aromatic properties of [32]octaphyrins（1.***.1.0.1.***.1.0） through rotating the pyrrolic ring of the macrocycles are demonstrated by theoretical simulations in CH2Cl2 solution. Facile multistep isomeriza- tions involving antiaromatic-Htickel and aromatic-Mobius topologies were also predicted by density functional theory （DFT）. The understanding of changes in topologies and aromaticities of free-base expanded porphrins may provide useful information to build new macrocycles with unique properties.

关键词： theoretical investigation expanded porphyrin conformational interconversion aromaticity

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Distributed Reduced-order Optimal Fusion Kalman Filters for Stochastic Singular Systems

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自动化学报 2006年第2期32卷 286-290页

作者： SUN Shu-Li ma jing Department of Automation Heilongjiang University Harbin 150080

Based on the optimal fusion algorithm weighted by matrices in the linear minimum variance (LMV) sense, a distributed full-order optimal fusion Kalman filter (DFFKF) is given for discrete-time stochastic singular systems with multiple sensors, which involves the inverse of a high-dimension matrix to compute matrix weights. To reduce the computational burden, a distributed reduced-order fusion Kalman filter (DRFKF) is presented, which involves in parallel the inverses of two relatively low-dimension matrices to compute matrix weights. A simulation example shows the effectiveness.

关键词：多传感器信息融合 Kalman滤波随机奇异系统

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A New Method for Finding Impossible Differentials of Generalized Feistel Structures

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Chinese Journal of Electronics 2018年第4期27卷 728-733页

作者： CUI Ting JIN Chenhui ma jing Information Science and Technology Institute

Impossible differential cryptanalysis is one of the most powerful attacks against modern block *** most cases, the resistance of a block cipher against impossible differential cryptanalysis can be measured by the length of the longest impossible differentials. By taking a closer look into the round function, we present a new method to find longer impossible differentials of wordoriented generalized Feistel structures. We conclude the existence of impossible differentials by the nonzero points of the XOR-ed masked differences in the middle *** method uses differential style and its nonzero point to find the impossible differential, which is much easier than the classical impossible differential searching *** applying our method, we can find several longest impossible differentials of some famous block cipher structures with SP(Substitution-permutation) round *** some extra conditions of the round function are taken into consideration(e.g. the permutation layer is designed as binary matrix or some sparse matrix), longer impossible differentials could be achieved by our method.

关键词： Impossible differential Generalized Feistel structure Differential style Nonzero point method

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Tunable Rashba spin splitting in quantum-spin Hall- insulator AsF bilayers

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Nano Research 2017年第2期10卷 491-502页

作者： Jun Zhao Wanlin Guo jing ma School of Chemistry and Chemical Engineering Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic Chemistry of MOE Nanjing University Nanjing 210093 China State Key Laboratory of Mechanics and Control of Mechanical Structures Institute of Nano Science Nanjing University of Aeronautics and Astronau tics Nanjing 210016 China School of Physics and Optoelectronic Engineering Yangtze University Jingzhou 434023 China

Rashba spin splitting （RSS） in quantum-spin Hall （QSH） insulators is of special importance for fabricating spintronic devices. By changing the stacking order, a unique bilayered fluorinated arsenene （AsF） system is demonstrated to simultaneously possess RSS and non-trivial topological electronic states. We show by first-principle calculations that tunable RSS can be realized in bilayered AsF. Intrinsic RSS of 25 meV is obtained in the AA-stacked AsF bilayer by considering the spin-orbit coupling effect. The RSS can be tuned in the range of 0 to 50 meV by applying biaxial strains and can be significantly enhanced up to 186 meV in the presence of an external electric field. The AB-stacked AsF bilayer is shown to be a two-dimensional topological insulator with a sizable bulk bandgap of 140 meV （up to 240 meV）, which originates from the spin-orbit coupling within the p~,y-pz band inversion. Surprisingly, RSS up to 295 meV can be induced in the AB-stacked AsF bilayer by applying an external electric field, while the robust topology property without RSS can be retained under the applied strains. The AsF bilayers with tunable RSS and a nontrivial bandgap with AA- and AB-stacking orders can pave the way for designing spin field-effect transistors and new QSH devices.

关键词： Rashba spin splitting topological insulator bilayer AsF tensile strain electric field

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Degradation of polycyclic aromatic hydrocarbons by Pseudomonas ***2 isolated from active sewage sludge of chemical plant

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Journal of Environmental Sciences 2012年第12期24卷 2141-2148页

作者： jing ma Li Xu Lingyun Jia School of Life Science and Biotechnology Dalian University of TechnologyLiaoning 116023China

It is important to screen strains that can decompose polycyclic aromatic hydrocarbons （PAHs） completely and rapidly with good adaptability for bioremedlation in a local area. A bacterial strain JM2, which uses pbenanthrene as its sole carbon source, was isolated from the active sewage sludge from a chemical plant in Jilin, China and identified as Pseudomonas based on 16S rDNA gene sequence analysis. Although the optimal growth conditions were determined to be pH 6.0 and 37~C, JM2 showed a broad pH and temperature profile. At pH 4.5 and 9.3, JM2 could degrade more than 40% of fluorene and phenanthrene （50 mg/L each） within 4 days. In addition, when the temperature was as low as 4~C, JM2 could degrade up to 24% fluorene and 12% phenanthrene. This showed the potential for JM2 to be applied in bioremediation over winter or in cold regions. Moreover, a nutrient augmentation study showed that adding formate into media could promote PAH degradation, while the supplement of salicylate had an inhibitive effect. Furthermore, in a metabolic pathway study, salicylate, phthalic acid, and 9-fluorenone were detected during the degradation of fluorene or phenanthrene. In conclusion, Pseudomonas sp. JM2 is a high performance strain in the degradation of fluorene and phenanthrene under extreme pH and temperature conditions. It might be useful in the bioremediation of PAHs.

关键词： polycyclic aromatic hydrocarbons Pseudomonas sp. biodegradation formate salicylate

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Rate-distortion weighted SPIHT algorithm for interferometer data processing

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Journal of Systems Engineering and Electronics 2011年第4期22卷 547-556页

作者： jing ma Jindong Fei Dong Chen Science and Technology on Space Systems Simulation Laboratory Beijing Simulation Center Beijing 100854 E R. China Institute of Telecommunication Satellite China Academy of Space Technology Beijing 100094 P. R. China

As one of the next generation imaging spectrometers, the interferential spectrometer （iS） possesses the advantages of high throughput, multi-channel and great resolution. The data of IS are produced in the spatial domain, but optical applications are in the Fourier domain. Traditional compression methods can only protect the visual quality of interferometer data in the spatial do- main but ignore the distortion in the Fourier domain. The relation between the distortion in the Fourier domain and the compression in the spatial domain is analyzed. By mathematical proof and val- idation with experiments, the relation between spatial and Fourier domains is discovered, and the significance in the Fourier domain is more important as optical path difference （OPD） increasing in the spatial domain. Based on this relation, a novel coding scheme is proposed, which can compress data in the spatial domain while reducing the distortion in the Fourier domain. In this scheme, the bit stream of the set partitioning in hierarchical trees （SPIHT） is truncated by adaptively lifting rate-distortion slopes according to the priorities of OPD based on rate-distortion optimization theory. Experimental results show that the proposed method can provide better protection of spectrum curves in the Fourier domain while maintaining a comparable visual quality in the spatial domain.

关键词： interferential spectrometer (IS) multi-spectrum compression set partitioning in hierarchical trees (SPIHT).

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Stretch-shear mode laminated metglas/Pb(Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect

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Science Bulletin 2017年第6期62卷 388-390页

作者： Chengzhou Xin Jiannan ma jing ma Cewen Nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensors and transducers[1].Direct ME effect,which describe the appearance of an electric polarization P upon applying a magnetic field H,is usually evaluated by the

关键词： mode Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect PZT ME Ti

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Deep learning for complex chemical systems

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National Science Review 2023年第12期10卷 8-10页

作者： Wei Li Guoqiang Wang jing ma Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical Engineering Nanjing University

Modern experimental techniques and theoretical simulations extended the research scope of complex chemical processes in functional molecules/materials innovation. Quantum chemistry (QC)-level simulations of macromolecules and condensed-phase systems need machine learning (ML) or deep learning (DL)[1]to decrease computational costs, which traditionally increases exponentially with system size. To guide rational design and optimize synthetic processes,

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Theoretical study of low-lying excited states of molecular aggregates. I. Development of linear-scaling TD-DFT

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Science China Chemistry 2013年第9期56卷 1263-1266页

作者： LIU WenJian ma jing Beijing National Laboratory for Molecular Sciences Institute of Theoretical and Computational ChemistryState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular Engineeringand Center for Computational Science and EngineeringPeking University School of Chemistry and Chemical Engineering Institute of Theoretical and Computational ChemistryKey Laboratory of Mesoscopic Chemistry of MOENanjing University

The project aims to develop an integrated linear-scaling time-dependent density functional theory (TD-DFT) for studying low-lying excited states of luminescent molecular materials, especially those fluorescence and phosphorescence co-emitting systems. The central idea will be "from fragments to molecule" (FF2M). That is, the fragmental information will be employed to synthesize the molecular wave function, such that the locality (transferability) of the fragments (functional groups) is directly built into the algorithms. Both relativistic and spin-adapted open-shell TD-DFT will be considered. Use of the renormalized exciton method will also be made to further enhance the efficiency and accuracy of TD-DFT. Solvent effects are to be targeted with the fragment-based solvent model. It is expected that the integrated TD-DFT and program will be of great value in rational design of luminescent molecular materials.

关键词： linear-scaling TD-DFT from fragments to molecule spin-orbit coupling renormalized excitions fragment-based solvent model luminsescent molecular material

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