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Subspace Clustering via Block-Diagonal Decomposition

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Chinese Journal of Electronics 2024年第6期33卷 1373-1382页

作者： Zhiqiang fu Yao ZHAO Dongx.a CHANG yiming wang Institute of Information Science Beijing Jiaotong University Beijing Key Laboratory of Advanced Information Science and Network Technology China Construction Bank

The subspace clustering has been addressed by learning the block-diagonal self-ex.ressive matrix. This block-diagonal structure heavily affects the accuracy of clustering but is rather challenging to obtain. A novel and effective subspace clustering model, i.e., subspace clustering via block-diagonal decomposition(SCBD), is proposed,which can simultaneously capture the block-diagonal structure and gain the clustering result. In our model, a strict block-diagonal decomposition is introduced to directly pursue the k block-diagonal structure corresponding to k clusters. In this novel decomposition, the self-ex.ressive matrix.is decomposed into the block indicator matrix.to demonstrate the cluster each sample belongs to. Based on the strict block-diagonal decomposition, the block-diagonal shift is proposed to capture the local intra-cluster structure, which shifts the samples in the same cluster to get smaller distances and results in more discriminative features for clustering. Ex.ensive ex.erimental results on synthetic and real databases demonstrate the superiority of SCBD over other state-of-the-art methods.

关键词： Accuracy Databases Data models Matrix.decomposition

Analysis of energy release rate for composite delaminated cylindrical shells subjected to ax.al compression

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Acta Mechanica Sinica 2006年第6期22卷 537-546页

作者： Jinhua Yang yiming fu Department of Engineering Mechanics Hunan University Changsha 410082 China

In this paper, the postbuckling governing equations and the analytical ex.ression of the energy release rates associated with delamination growth in a compression-loaded cylindrical shell are derived by using the variational principle of moving boundary and the Griffith fracture criterion. The finite difference method is used to generate the postbuckling solutions of the delaminated cylindrical shells, and with these solutions, the values of the energy release rates are determined. In simulational ex.mples, the effects of a wide range of parameters, such as delamination sizes and depths, boundary conditions, geometrical parameters, material properties and laminate stacking sequences on the energy release rates of ax.symmetrical laminated cylindrical shells are intensively discussed.

关键词： Composite cylindrical shell Delamination Griffith criterion Energy release rates Finite difference method

Analysis of nonlinear vibration for symmetric angle-ply laminated viscoelastic plates with damage

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Acta Mechanica Sinica 2005年第5期21卷 459-466页

作者： Yufang Zheng yiming fu Department ofEngineering Mechanics Hunan University Changsha410082 China

The behavior of nonlinear vibration for symmetric angle-ply laminated plates including the material viscoelasticity and damage evolution is investigated. By employing the von Karman＇s nonlinear theory, strain energy equivalence principle and Boltzmann superposition principle, a set of governing equations of nonlinear integro-differential type are derived. By applying the finite difference method, Newmark method and iterative procedure, the governing equations are solved. The effects of loading amplitudes, ex.iting frequencies and different ply orientations on the critical time to failure initiation and nonlinear vibration amplitudes of the structures are discussed. Numerical results are presented for the different parameters and compared with the available data.

关键词： Viscoelasticity . Damage evolution. Laminated plates . Structure's failure initiation

Grapevine-like high entropy ox.de composites boost high-performance lithium sulfur batteries as bifunctional interlayers

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Green Energy & Environment 2024年第3期9卷 565-572页

作者： Huarong Fan Yubing Si yiming Zhang fulong Zhu x.n wang Yongzhu fu College of Chemistry and Center of Green Catalysis Zhengzhou UniversityZhengzhou450001China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731China

Lithium-sulfur batteries(LSBs)with high energy densities have been demonstrated the potential for energy-intensive demand ***,their commercial applicability is hampered by hysteretic electrode reaction kinetics and the shuttle effect of lithium polysulfides(LiPSs).In this work,an interlayer consisting of high-entropy metal ox.de(Cu_(0.7)Fe_(0.6)Mn_(0.4)Ni_(0.6)Sn_(0.5))O_(4) grown on carbon nanofibers(HEO/CNFs)is designed for *** CNFs with highly porous networks provide transport pathways for Li^(+) and e^(-),as well as a physical sieve effect to limit LiPSs *** particular,the grapevine-like HEO nanoparticles generate metal-sulfur bonds with LiPSs,efficiently anchoring active *** unique structure and function of the interlayer enable the LSBs with superior electrochemical performance,i.e.,the high specific capacity of 1381 mAh g^(-1) at 0.1 C and 561 mAh g^(-1) at 6 *** work presents a facile strategy for ex.loiting high-performance LSBs.

关键词： Electrospun carbon nanofibers Grapevine-like morphology Hierarchical physical sieve effect High-entropy induced chemisorption Lithium-sulfur battery

Porphyra haitanensis polysaccharide(PH)attenuates cell hyperplasia via remodeling the cross-talk between Hippo/YAP and mTOR pathways

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Food Science and Human Wellness 2023年第2期12卷 424-430页

作者： Chong wang wanglei Lin Zhihua Sun yiming Sun Yanbo wang Linglin fu Food Safety Key Laboratory of Zhejiang Province School of Food Science and BiotechnologyZhejiang Gongshang UniversityHangzhou 310018China The Affiliated High School to Hangzhou Normal University Hangzhou 310030China

Porphyra polysaccharide is a special kind of nutrient showing multiple physiological functions including regulating cell proliferation,but the detailed mechanisms are not fully revealed,impairing its further development and *** work was to purify and characterize the Porphyra haitanensis polysaccharide(PH),investigate its physiological function,and demonstrate the underlying *** purified PH was first characterized by Fourier-transform infrared *** an intestinal epithelial cell model was established,in which PH significantly suppressed cell ***,PH activated the Hippo/YAP pathway,which subsequently activated m TOR pathway,however m TOR activated Hippo in the absence of ***,both the inhibition of Hippo by YAP1 knock-down and the suppression of m TOR by rapamycin impaired PH *** results indicated that PH attenuated hyperplasia activity by remodeling the cross-talk between Hippo/YAP and m TOR pathways,which revealed potential targets and approaches for treating hyperplasia-related diseases and provided novel ways to utilize *** as well as other related functional foods.

关键词： Porphyra haitanensis Polysaccharide Hippo mTOR Cancer

Stochastic response analysis of damaged elastic beams

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Science China(Technological Sciences) 2012年第6期55卷 1618-1623页

作者： TIAN YanPing fu yiming School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

Great progress has been made in study on dynamic behavior of the damaged structures subject to deterministic *** stochastic response analysis of the damaged structures,however,has not yet attracted people's *** the damaged elastic beams for ex.mple,the analysis procedure for stochastic response of the damaged structures subject to stochastic ex.itations is investigated in this ***,the damage constitutive relations and the corresponding damage evolution equation of one-dimensional elastic structures are briefly ***,the stochastic dynamic equation with respect to transverse displacement of the damaged elastic beams is *** finite difference method and Newmark method are adopted to solve the stochastic partially-differential equation and corresponding boundary *** stochastic response characteristic,damage evolution law,the effect of noise intensity on damage evolution and the first-passage time of damage are discussed in *** present work ex.ends the research field of damaged structures,and the proposed procedure can be generalized to analyze the dynamic behavior of more complex.structures,such as damaged plates and shells.

关键词： damaged elastic beams stochastic response Gaussian white noise first-passage time of damage finite differencemethod

ANALYSIS OF ELASTO-PLASTIC POSTBUCKLING AND ENERGY RELEASE RATE FOR DELAMINATED FIBER METAL LAMINATED BEAMS IN THERMAL ENVIRONMENT

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Acta Mechanica Solida Sinica 2015年第6期28卷 693-705页

作者： yiming fu Yang Chen x.efei Shao State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University College of Mechanical and Vehicle Engineering Hunan University

The elasto-plastic postbuckling of fiber metal laminated beams with delamination and the energy release rate along the delamination front are discussed in this paper. Considering geometrical nonlinearity, thermal environment and geometrical initial imperfection, the incremental nonlinear equilibrium equations of delaminated fiber metal laminated beams are established, which are solved using the differential quadrature method and iterative method. Based on these, according to the J-integral theory, the elasto-plastic energy release rate is studied. The effects of some important parameters on the elasto-plastic postbuckling behavior and energy release rate of the aramid reinforced aluminum laminated beams are discussed in details.

关键词： fiber metal laminated beams delamination temperature effect elasto-plastic post- buckling elasto-plastic energy release rate

NONLINEAR TRANSIENT RESPONSE OF fuNCTIONALLY GRADED SHALLOW SPHERICAL SHELLS SUBJECTED TO MECHANICAL LOAD AND UNSTEADY TEMPERATURE FIELD

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Acta Mechanica Solida Sinica 2014年第5期27卷 496-508页

作者： yiming fu Sumin Hu Yiqi Mao College of Mechanical and Vehicle Engineering Hunan University

This paper is concerned with the transient deformation of functionally graded （FG） shallow spherical shells subjected to time-dependent thermomechanical load. Based on Timoshenko- Mindlin hypothesis and yon Karman nonlinear theory, a set of nonlinear governing equations of motion for FG shallow spherical shells in regard to transverse shear deformation and all the inertia terms are established using Hamilton＇s principle. The collocation point method and Newmark- beta scheme in conjunction with the finite difference method are adopted to solve the governing equations of motion and the unsteady heat conduction equation numerically. In the numerical ex.mples, the transient deflection and stresses of FG shallow spherical shells with various material properties under different loading conditions are presented.

关键词： functionally graded materials unsteady temperature field transient deflection andstresses

Advances of entropy-stabilized homologous compounds for electrochemical energy storage

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Journal of Energy Chemistry 2022年第4期31卷 276-289页

作者： x.n wang x.ang Li Huarong Fan Ming Miao yiming Zhang Wei Guo Yongzhu fu College of Chemistry Zhengzhou University Zhengzhou 450001Henan China

Recently, high-entropy materials(HEMs) have gained increasing interest in the field of energy storage technology on account of their unique structural characteristics and possibilities for tailoring functional properties. Herein, the development of this class of materials for electrochemical energy storage have been reviewed, especially the fundamental understanding of entropy-dominated phase-stabilization effects and prospective applications are presented. Subsequently, critical comments of HEMs on the different aspects of battery and supercapacitor are summarized with the underlying principles for the observed properties. In addition, we also summarize their potential advantages and remaining challenges, which will ideally provide some general guidelines and principles for researchers to study and develop advanced HEMs. The diversity of material design contributed by the entropy-mediated concept provides the researchers numerous ideas of new candidates for practical applications and ensures further research in the emerging field of energy storage.

关键词： High entropy material Battery Supercapacitor Entropy-stabilized conversion mechanism