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Some Combinatorial Properties of Words in Discrete Dynamical Systems from Antisymmetric Cubic Maps

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Acta Mathematica Sinica,English Series 2013年第11期29卷 2181-2192页

作者： Ke bo lu Department of Mathematics Ocean University of China

In this paper, we study the combinatorial properties ol words m chscrete dynamical systems from antisymmetric cubic maps. We also discuss the relationship of primitive kneading sequences of length n and period-doublin... 详细信息

关键词： MSS sequence MSbius inversion parity-lexicographic order

A pre-strain strategy of current collectors for suppressing electrode debonding in lithium-ion batteries

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Applied Mathematics and Mechanics(English Edition) 2023年第4期44卷 547-560页

作者： bo RUI bo lu Yicheng SONG Junqian ZHANG Department of Mechanics Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200444China Shanghai Frontier Science Center of Mechanoinformatics Shanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China

The interfacial debonding between the active layer and the current collector has been recognized as a critical mechanism for battery fading,and thus has attracted great efforts focused on the related ***,much still remains to be studied regarding practical methods for suppressing electrode debonding,especially from the perspective of *** this paper,a pre-strain strategy of current collectors to alleviate electrode debonding is *** analytical model for a symmetric electrode with a deformable and limited-thickness current collector is developed to analyze the debonding behavior involving both a pre-strain of the current collector and an eigen-strain of the active *** results reveal that the well-designed pre-strain can significantly delay the debonding onset(by up to 100%)and considerably reduce the debonding *** critical values of the pre-strain are identified,and the pre-strain design principles are also *** on these findings,this work sheds light on the mechanical design to suppress electrode degradation.

关键词： pre-strain current collector electrode debonding lithium-ion battery(LIB) mechanically-based design

A Note on DG-Gorenstein Injective Complexes

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Algebra Colloquium 2020年第4期27卷 731-740页

作者： bo lu Kaiyang Lan College of Mathematics and Computer Science Northwest Minzu University Lanzhou 730030China

The notion of DG-Gorenstein injective complexes is studied in this *** is shown that a complex G is DG-Gorenstein injective if and only if G is exact with Z_(n)(G)Gorenstein injective in R-Mod for each n∈Zand any mor... 详细信息

关键词： Gorenstein injective module DG-injective complex DG-Gorenstein injective complex

The precise condition of thermal runaway in microwave heating on chemical reaction

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Science China(Technological Sciences) 2009年第2期52卷 491-496页

作者： HUANG KaMa lu bo School of Electronics and Information Engineering Sichuan UniversityChengdu 610064China

The precise condition of thermal runaway in microwave heating on chemical reaction with a feedback control system is quantitatively studied. First, the precise condition of thermal runaway in engineering application is derived based on the principle of the feedback control system. Then, the temperature rising rates for 4 different kinds of reaction systems placed in the waveguide and irradiated by micro-wave with different input powers are simulated. Finally, the relationship, which is inattentive so far, between the thermal runaway and the sensor's response time is discussed.

关键词： microwave chemistry microwave heating thermal runaway multi-physics computation

Data envelopment analysis procedure with two non-homogeneous DMU groups

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Journal of Systems Engineering and Electronics 2018年第4期29卷 780-788页

作者： CHEN Ye WU Liangpeng lu bo College of Economics and Management Nanjing University of Aeronautics and Astronautics

The classic data envelopment analysis（DEA） model is used to evaluate decision-making units＇（DMUs） efficiency under the assumption that all DMUs are evaluated with the same criteria setting. Recently, new researches begin to focus on the efficiency analysis of non-homogeneous DMU arose by real practices such as the evaluation of departments in a university, where departments argue for the adoption of different criteria based on their disciplinary characteristics. A DEA procedure is proposed in this paper to address the efficiency analysis of two non-homogeneous DMU groups. Firstly, an analytical framework is established to compromise diversified input and output（IO） criteria from two nonhomogenous groups. Then, a criteria fusion operation is designed to obtain different DEA analysis strategies. Meanwhile, Friedman test is introduced to analyze the consistency of all efficiency results produced by different strategies. Next, ordered weighted averaging（OWA） operators are applied to integrate different information to reach final conclusions. Finally, a numerical example is used to illustrate the proposed method. The result indicates that the proposed method relaxes the restriction of the classical DEA model,and can provide more analytical flexibility to address different decision analysis scenarios arose from practical applications.

关键词： data envelopment analysis (DEA) non-homogeneousdecision-making unit (DMU) criteria fusion Friedman test ordered weighted averaging (OWA) operator

Lithium Diffusion and Stress in a Polycrystalline Film Electrode

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Acta Mechanica Solida Sinica 2018年第3期31卷 290-309页

作者： YanFei Zhao bo lu Junqian Zhang Department of Civil Engineering Shanghai University Materials Genome Institute Shanghai University and Shanghai Materials Genome Institute Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Department of Mechanics Shanghai University

In the present work, the two-dimensional analytical solution for Li diffusion in grains and grain boundaries of a polycrystalline film electrode is established with consideration of Li-segregation at the grain boundary. The stress field induced by the inhomogeneity of Li con- centration, called chemical stress here for brevity, is analyzed via the finite element simulation. The effects of the grain boundary including its size, its diffusion coefficient as well as the segrega- tion phenomenon on the solute concentration and the chemical stress are examined. It shows that grain boundaries can assist fast diffusion and significantly affect the stress profile in the whole film. It proves that tailoring the grain boundary size or other grain boundary-related parameters may provide an alternative strategy for improving the overall diffusivity and mechanical stability of battery electrodes.

关键词： Polycrystalline film Two-dimensional diffusion Grain boundary Segregation Chemical stress

ENSO Features, Dynamics, and Teleconnections to East Asian Climate as Simulated in CAMS-CSM

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Journal of Meteorological Research 2019年第1期33卷 46-65页

作者： bo lu Hong-Li REN Laboratory for Climate Studies & China Meteorological Administration–Nanjing University Joint Laboratory for Climate Prediction Studies National Climate Center China Meteorological Administration Xinjiang Climate Center Department of Atmospheric Science School of Environmental Studies China University of Geoscience

This study evaluates the performance of CAMS-CSM(the climate system model of the Chinese Academy of Meteorological Sciences) in simulating the features, dynamics, and teleconnections to East Asian climate of the El Ni?o–Southern Oscillation(ENSO). In general, fundamental features of ENSO, such as its dominant patterns and phase-locking features, are reproduced well. The two types of El Ni?o are also represented, in terms of their spatial distributions and mutual independency. However, the skewed feature is missed in the model and the simulation of ENSO is extremely strong, which is found—based on Bjerknes index assessment—to be caused by underestimation of the shortwave damping effect. Besides, the modeled ENSO exhibits a regular oscillation with a period shorter than observed. By utilizing the Wyrtki index, it is suggested that this periodicity bias results from an overly quick phase transition induced by feedback from the thermocline and zonal advection. In addition to internal dynamics of ENSO,its external precursors—such as the North Pacific Oscillation with its accompanying seasonal footprinting mechanism, and the Indian Ocean Dipole with its 1-yr lead correlation with ENSO—are reproduced well by the model. Furthermore, with respect to the impacts of ENSO on the East Asian summer monsoon, although the anomalous Philippine anticyclone is reproduced in the post-El Ni?o summer, it exhibits an eastward shift compared with observation;and as a consequence, the observed flooding of the Yangtze River basin is poorly represented, with unrealistic air–sea interaction over the South China Sea being the likely physical origin of this bias. The response of wintertime lowertropospheric circulation to ENSO is simulated well, in spite of an underestimation of temperature anomalies in central China. This study highlights the dynamic processes that are key for the simulation of ENSO, which could shed some light on improving this model in the future.

关键词： model evaluation ENSO dynamics teleconnection CAMS-CSM

Cartan-Eilenberg iV-complexes with respect to self-orthogonal subcategories

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Frontiers of Mathematics in China 2020年第2期15卷 351-365页

作者： bo lu Zhenxing DI Yifu LIU College of Mathematics and Computer Science Northwest Minzu UniversityLanzhou 730030China Department of Mathematics Northwest Normal UniversityLanzhou 730070China

Let R be an arbitrary associated *** an integer N≥2 and a self-orthogonal subcategory W of R-modules,we study the notion of Cartan-Eilenberg W *** show that an N-complex X is Cartan-Eilenberg W if and only if X≌X′■X″in which X′is a W iV-complex and X″is a graded/7-module with X″n∈W for all n∈*** applications of the result,we obtain some characterizations of Cartan-Eilenberg projective and injective N-complexes,establish Cartan and Eilenberg balance of N-complexes,and give some examples for some fixed integers N to illustrate our main results.

关键词： Cartan-Eilenberg W N-complex,Cartan-Eilenberg projective N-complex Cartan-Eilenberg injective TV-complex Cartan-Eilenberg balance

Analysis of thermal management and anti-mechanical abuse of multi-functional battery modules based on magneto-sensitive shear thickening fluid

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 529-542页

作者： Yang XIONG bo lu Yicheng SONG Junqian ZHANG Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China

Electric vehicles(EVs)have garnered significant attention as a vital driver of economic growth and environmental ***,ensuring the safety of high-energy batteries is now a top priority that cannot be overlooked during large-scale *** paper proposes an innovative active protection and cooling integrated battery module using smart materials,magneto-sensitive shear thickening fluid(MSTF),which is specifically designed to address safety threats posed by lithium-ion batteries(LIBs)exposed to harsh mechanical and environmental *** theoretical framework introduces a novel approach for harnessing the smoothed-particle hydrodynamics(SPH)methodology that incorporates the intricate interplay of non-Newtonian fluid behavior,capturing the fluid-structure coupling inherent to the *** approach is further advanced by adopting an enhanced Herschel-Bulkley(H-B)model to encapsulate the intricate rheology of the MSTF under the influence of the magnetorheological effect(MRE)and shear thickening(ST)*** simulation results show that in the case of cooling,the MSTF is an effective cooling medium for rapidly reducing the *** terms of mechanical abuse,the MSTF solidifies through actively applying the magnetic field during mechanical compression and impact within the battery module,resulting in 66%and 61.7%reductions in the maximum stress within the battery jellyroll,and 31.1%and 23%reductions in the reaction force,*** mechanism effectively lowers the risk of short-circuit *** groundbreaking concepts unveiled in this paper for active protection battery modules are anticipated to be a valuable technological breakthrough in the areas of EV safety and lightweight/integrated design.

关键词： magneto-sensitive shear thickening fluid(MSTF) battery module impact protection temperature control integrated design