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A dual-functional poly(vinyl alcohol)/poly(lithium acrylate)composite nanofiber separator for ionic shielding of polysulfides enables high-rate and ultra-stable Li-S batteries

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Nano Research 2021年第5期14卷 1541-1550页

作者： Chunyang Zhou Jing Wang Xiaobo Zhu Kai Chen yue Ouyang yue Wu yue-E Miao Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInnovation Center for Textile Science and TechnologyDonghua University2999 North Renmin RoadShanghai201620China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China Research Center for Analysis and Measurement Donghua UniversityShanghai201620China Bristol Composites Institute(ACCIS) Department of Aerospace EngineeringQueen’s BuildingUniversity of BristolUniversity WalkBristolBS81TRUK

Despite the high theoretical specific capacity,the main challenges of rechargeable lithium-sulfur(Li-S)batteries,including the unceasing shuttle of soluble lithium polysulfides(LiPSs)and severe Li corrosion,seriously hinder their commercial and practical ***,a bifunctional polyvinyl alcohol/poly(lithium acrylate)(C-PVA/PAA-Li)composite nanofiber separator is developed to address the main challenges in Li-S batteries by simultaneously allowing rapid lithium ion transport and ionic shielding of *** C-PVA/PAA-Li composite nanofiber membrane is prepared via the facile electrospinning strategy,followed by thermal crosslinking and in-situ lithiation *** from the conventional Celgard-based coating methods accompanied by impaired lithium ion transport efficiency,the C-PVA/PAA-Li composite nanofiber membrane possesses well-developed porous structures and high ionic conductivity,thus synergistically reducing the charge transfer resistance and inhibiting the growth of lithium *** resulting Li-S batteries exhibit an ultra-low fading rate of 0.08%per cycle after 400 cycles at 0.2 C,and a capacity of 633 mAhg−1 at a high current density of 3 *** study presents an inspiring and promising strategy to fabricate emerging dual-functional separators,which paves the pathway for the practical implementation of ultra-stable and reliable Li-S battery systems.

关键词： nanofiber separator electrospinning ionic shielding dendrite-free lithium-sulfur battery

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Entropy convergence of new two-value scheme with slope relaxation for conservation laws

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Applied Mathematics and Mechanics(English Edition) 2016年第11期37卷 1551-1570页

作者： yue WANG Jiequan LI Institute of Applied Physics and Computational Mathematics Beijing 100094China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100094China

This paper establishes the resolution finite volume scheme with slope entropy convergence of a new two-value high relaxation for conservation laws. This scheme, motivated by the general method of high resolution schemes that have high-order accuracy in smooth regions of solutions and are free of oscillations near discontinuities, unifies and evolves slopes directly with a slope relaxation equation that governs the evolution of slopes in both smooth and discontinuous regions. Proper choices of slopes are realized adaptively via a relaxation parameter. The scheme is shown to be total-variation-bounded （TVB） stable and satisfies cell-entropy inequalities.

关键词： conservation law slope relaxation two-value scheme

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Unsupervised feature selection via joint local learning and group sparse regression

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Frontiers of Information Technology & Electronic Engineering 2019年第4期20卷 538-553页

作者： yue WU Can WANG yue-qing ZHANG Jia-jun BU Zhejiang Provincial Key Laboratory of Service Robot College of Computer Science and Technology Zhejiang University Alibaba-Zhejiang University Joint Institute of Frontier Technologies

Feature selection has attracted a great deal of interest over the past decades. By selecting meaningful feature subsets, the performance of learning algorithms can be effectively improved. Because label information is expensive to obtain, unsupervised feature selection methods are more widely used than the supervised ones. The key to unsupervised feature selection is to find features that effectively reflect the underlying data distribution. However,due to the inevitable redundancies and noise in a dataset, the intrinsic data distribution is not best revealed when using all features. To address this issue, we propose a novel unsupervised feature selection algorithm via joint local learning and group sparse regression(JLLGSR). JLLGSR incorporates local learning based clustering with group sparsity regularized regression in a single formulation, and seeks features that respect both the manifold structure and group sparse structure in the data space. An iterative optimization method is developed in which the weights finally converge on the important features and the selected features are able to improve the clustering results. Experiments on multiple real-world datasets(images, voices, and web pages) demonstrate the effectiveness of JLLGSR.

关键词： Unsupervised Local learning Group sparse regression Feature selection

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Attitude tracking control of flexible spacecraft with large amplitude slosh

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Acta Mechanica Sinica 2017年第6期33卷 1095-1102页

作者： Mingle Deng Baozeng yue School of Aerospace Engineering Beijing Institute of Technology Beijing 100081 China

This paper is focused on attitude tracking control of a spacecraft that is equipped with flexible appendage and partially filled liquid propellant tank. The large amplitude liquid slosh is included by using a moving pulsating ball model that is further improved to estimate the settling location of liquid in microgravity or a zero-g environment. The flexible appendage is modelled as a three-dimensional Bernoulli–Euler beam, and the assumed modal method is employed.A hybrid controller that combines sliding mode control with an adaptive algorithm is designed for spacecraft to perform attitude tracking. The proposed controller has proved to be asymptotically stable. A nonlinear model for the overall coupled system including spacecraft attitude dynamics,liquid slosh, structural vibration and control action is established. Numerical simulation results are presented to show the dynamic behaviors of the coupled system and to verify the effectiveness of the control approach when the spacecraft undergoes the disturbance produced by large amplitude slosh and appendage vibration. Lastly, the designed adaptive algorithm is found to be effective to improve the precision of attitude tracking.

关键词： Attitude tracking Large amplitude liquid slosh Flexible spacecraft Dynamic coupling Adaptive sliding mode control

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Calculation of high-temperature insulation parameters and heat transfer behaviors of multilayer insulation by inverse problems method

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Chinese Journal of Aeronautics 2014年第4期27卷 791-796页

作者： Huang Can Zhang yue Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beihang University

In the present paper, a numerical model combining radiation and conduction for porous materials is developed based on the finite volume method. The model can be used to investigate high-temperature thermal insulations which are widely used in metallic thermal protection systems on reusable launch vehicles and high-temperature fuel cells. The effective thermal conductivities（ECTs） which are measured experimentally can hardly be used separately to analyze the heat transfer behaviors of conduction and radiation for high-temperature insulation. By fitting the effective thermal conductivities with experimental data, the equivalent radiation transmittance, absorptivity and reflectivity, as well as a linear function to describe the relationship between temperature and conductivity can be estimated by an inverse problems method. The deviation between the calculated and measured effective thermal conductivities is less than 4%. Using the material parameters so obtained for conduction and radiation, the heat transfer process in multilayer thermal insulation（MTI） is calculated and the deviation between the calculated and the measured transient temperatures at a certain depth in the multilayer thermal insulation is less than 6.5%.

关键词： Effective thermal conductivity Fibrous insulation Finite volume methodHeat transfer Multilayer thermal insulation Radiation

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Knittable and washable aerogel fiber inspired by polar bear hair

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Science China Materials 2024年第2期67卷 705-706页

作者： yue Liu Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Institute of Fiber Materials and DevicesFudan UniversityShanghai 200438China

The advances in chemistry and materials have boosted the development of smart textiles,which are poised to revolutionize human lifestyles through multifunctional integration,such as heating,cooling,sensing and supplying energy^([1,2]).Among them,thermal insulation is an essential function of textiles to protect humans from complex and extreme environments and realize personal thermal management without energy con-sumption^([3]).

关键词： textiles insulation extreme

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Multidimensional zero-crossing interval points: a low sampling rate acoustic fingerprint recognition method

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Science China(Information Sciences) 2019年第1期62卷 226-228页

作者： Xianghu yue Fang DENG yue XU School of Mathematics and Statistics Beijing Institute of Technology School of Automation Beijing Institute of Technology

Dear editor,In recent years, acoustic fingerprint recognition technique has been widely utilized in areas such as battle environments, environmental monitoring,security systems, and personal identification [1],which p... 详细信息

关键词： Multidimensional zero-crossing interval points a low sampling rate acoustic fingerprint recognition method

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Performance Analyses of Production Inventory Systems Considering Service Time and Product Returns of Online Shopping

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Journal of Systems Science & Complexity 2019年第3期32卷 888-906页

作者： QIN Yaling yue Dequan School of Economics and Management Yanshan University Qinhuangdao 066004 China LiRen College Yanshan University Qinhuangdao 066004 China College of Science Yanshan University Qinhuangdao 066004 China

This paper considers a production inventory system with service time and product returns, dependent on the characteristics of online shopping beliaviors. The customers arrive according to a Poisson process, in which the arriving customer requires an item in the inventory, as well as a server service that the service time is exponentially distributed. Moreover, there is one production facility to produce items according to (s, S) policy, and the production time also follows an exponential (listribution. In the beginning, the stationary joint distribution is obtained in the product form for the queue length and the on-hand inventory level. Additionally, the resulting distribution is applied to derive some performance measures, which can be adopted to numerically calculate the optimal (s, S) policy. Finally, numerical analyses are processed to investigate the effects of some system parameters on the performance measures. The numerical results clearly indicate that the product return rate has a significantly monotonic effect on the optimal policy and optimal cost.

关键词： Online shopping production inventory return service time (s, S) policy

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Numerical study of three-dimensional free surface dynamics

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Acta Mechanica Sinica 2006年第2期22卷 120-126页

作者： Baozeng yue Zhaolin Wang Department of Mechanics School of Science Beijing Institute of TechnologyBeijing 100081 China Institute of Astronautics and Aeronautics Tsinghua University Beijing 100084 China

The dynamic problem of three-dimensional free surface is numerically studied in this paper. The ALE （Arbitrary Lagrange-Euler） kinematic description is introduced into the control equation system. The ALE description method is used to track free surface. Accurate formulations for calculating the normal vector on the free surface are presented. The discrete numerical equations by finite element method are developed by Galerkin weighted residual method. The boundary condition about free-surface tension is represented in the form of weak integration that can be computed by a differential geometry method derived in the present paper. The effect of contact angle is incorporated in the numerical algorithm. Furthermore, the numerical computations are performed and the comparison between computational and analytical results validated the effectiveness of the method. The results of this paper provide a fundamental understandings of the dynamics of liquid free surfaces, in which the surface tension and contact angle boundary conditions are taken into account. Finally, numerical simulation of largescale amplitude sloshing of liquid in a cylindrical container is performed and a numerical analysis of the effect of an annular ring-shaped rigid damping baffle on liquid sloshing oscillations in a cylindrical tank is also carried out.

关键词： Free surface Surface tension Numerical simulation Finite element

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Distributed Tracking Control of a Class of Multi-agent Systems in Non-affine Pure-feedback Form Under a Directed Topology

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 169-180页

作者： Yang Yang Dong yue College of Automation Nanjing University of Posts and Telecommunications Nanjing 210023 China Institute of Advanced Technology and Jiangsu Engineering Laboratory of Big Data Analysis and Control for Active Distribution Network Nanjing University of Posts and Telecommunications Nanjing 210023 China IEEE

In this paper, we consider a consensus tracking problem of a class of networked multi-agent systems(MASs)in non-affine pure-feedback form under a directed topology. A distributed adaptive tracking consensus control scheme is constructed recursively by the backstepping method, graph theory,neural networks(NNs) and the dynamic surface control(DSC)approach. The key advantage of the proposed control strategy is that, by the DSC technique, it avoids "explosion of complexity"problem along with the increase of the degree of individual agents and thus the computational burden of the scheme can be drastically reduced. Moreover, there is no requirement for prior knowledge about system parameters of individual agents and uncertain dynamics by employing NNs approximation *** then further show that, in theory, the designed control policy guarantees the consensus errors to be cooperatively semi-globally uniformly ultimately bounded(CSUUB). Finally, two examples are presented to validate the effectiveness of the proposed control strategy.

关键词： Backstepping consensus multi-agent systems(MASs) neural networks(NNs)

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