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Nonlinear damage model for seismic damage assessment of reinforced concrete frame members and structures

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Acta Mechanica Sinica 2018年第5期34卷 949-962页

作者： Shuijing xiao Longhe Xu xiao lu School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

A nonlinear damage model based on the combination of deformation and hysteretic energy and its validation with experiments are ***,a combination parameter is defined to consider the mutual effect of deformation and hysteretic energy for different types of components in different loading *** reinforced concrete (RC) columns are simulated and analyzed using the nonlinear damage *** results indicate that the damage evolution evaluated by the model agrees well with the experimental ***,the seismic damage evolution of a six-story RC frame was analyzed,revealing four typical failure modes according to the interstory drift distribution of the structure;the damage values calculated using the nonlinear damage model agree well with the four typical failure modes.

关键词： RC frame structure Nonlinear damage model Damage evolution Combination parameter Hysteretic energy

Asymmetric Catalytic Polymerization: Advances and Challenges

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Chinese Journal of Polymer Science 2023年第1期41卷 1-2页

作者： xiao-Bing lu State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsDalian University of Technology

Most naturally occurring biomacromolecules are optically active owing to their unique chiral structural units and/or helical *** of them show specific functionalities,such as supersensitive responses to external stimuli,highly selective recognition abilities,superior mechanical properties,and excellent catalytic activity under extremely mild *** functionalities result from the unique chiral structural units and orderly arrangement of building blocks in the main-chain backbones of these biological macromolecules,such as enzymes,genes,and ***,the sequence and stereochemistry of the repeating units in a polymeric chain also have significant influence on their material ***,construction of functional polymers with precise control of chirality and sequence,similar to those in living systems,is of great significance.

关键词： precise Catalytic bones

Weighted composition operators from F(p,q,s) spaces to Bers-type spaces in the unit ball

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Applied Mathematics(A Journal of Chinese Universities) 2009年第4期24卷 462-472页

作者： lu xiao-fen Department of Mathematics Huzhou Teachers College Huzhou 313000 China

This paper deals with the boundedness and compactness of the weighted composition operators from the F（p, q, s） spaces, including Hardy space, Bergman space, Qp space, BMOA space, Besov space and α-Bloch space, to ... 详细信息

关键词： F(p q s) space Bers-type space weighted composition operator unit ball

Decentralized Optimal Control and Stabilization of Interconnected Systems With Asymmetric Information

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 698-707页

作者： Na Wang xiao Liang Hongdan Li xiao lu the College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266000China the School of Automation and Electrical Engineering Linyi UniversityLinyi 276000China the College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266000China

The paper addresses the decentralized optimal control and stabilization problems for interconnected systems subject to asymmetric *** with previous work,a closed-loop optimal solution to the control problem and sufficient and necessary conditions for the stabilization problem of the interconnected systems are given for the first *** main challenge lies in three aspects:Firstly,the asymmetric information results in coupling between control and estimation and failure of the separation ***,two extra unknown variables are generated by asymmetric information(different information filtration)when solving forward-backward stochastic difference ***,the existence of additive noise makes the study of mean-square boundedness an *** adopted technique is proving and assuming the linear form of controllers and establishing the equivalence between the two systems with and without additive noise.A dual-motor parallel drive system is presented to demonstrate the validity of the proposed algorithm.

关键词： Asymmetric information decentralized control forwardbackward stochastic difference equations interconnected system stalibization

Remarks on the recent progress of Materials Genome Initiative

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Science Bulletin 2015年第22期60卷 1966-1968页

作者： xiao-Gang lu School of Materials Science and Engineering Shanghai University Materials Genome Institute Shanghai University

The Materials Genome Initiative(MGI)has attracted great attention globally since June 2011,when the US President Obama announced Advanced Manufacturing Partnership(AMP),in which MGI is a key *** June 2014,the US National Science and Technology Council published‘‘Materials Genome Initiative Strategic Plan’’,describing in detail the strategy that guides and coordinates US Federal activities and provides a clear technical path

关键词：基因组计划材料科学技术委员会美国总统先进制造组成部分 AMP

Masses and Sigma Terms of Pentaquarks in Chiral Perturbation Theory

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Communications in Theoretical Physics 2006年第4X期46卷 704-710页

作者： LI xiao-Ya lu xiao-Fu Department of Physics Sichuan University Chengdu 610064 China Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080 China China Center of Advanced Science and Technology (World Laboratory) Beijing 100080 China

Assuming that the recently θ＋ and other exotic resonances belong to the pentaquark i0 of SU（3）I with J^P = 1/2, we constructed a relativistic effective lagrangian in the frame work of baryon chiral perturbation theory. The masses of pentaquarks under isospin symmetry is determined by calculating the propagator to one loop, where the extended on-mass-shell renormalization scheme is applied. Using the experimental data for masses of θ＋, Ξ and N, we estimated the mass of Σ and the a terms.

关键词： pentaquark chiral perturbation theory σ term

Partners in Epoxide Copolymerization Catalysis:Approach to High Activity and Selectivity

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Chinese Journal of Polymer Science 2022年第11期40卷 1331-1348页

作者： xiao-Bing lu Bai-Hao Ren State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China

The ring-opening alternating copolymerization processes of epoxides with small-molecule monomers,such as carbon dioxide(CO_(2)),carbonyl sulfide(COS)and cyclic anhydrides,are powerful strategies for preparing polymeric materials with degradable carbonate/ester/thiocarbonate main-chain backbone *** catalysts selected for copolymerization processes play crucial roles in determining their reaction rates and productivities,as well as the selectivity,regio-and stereochemistry,compositions,and the molecular weights of their resultant *** processes often generate undesirable byproducts such as polyether or ether linkages dispersed randomly within the copolymer's chain,and/or more thermodynamically stable cyclic *** this account,we outline our efforts of over a dozen years on developing highly active well-defined metal catalysts based on inter-and intra-molecular synergistic strategies to selectively produce completely alternating copolymers from epoxides and various small-molecule *** attention was paid to the enantioselective resolution copolymerization processes of racemic epoxides via regioselective ring-openings,and the asymmetric copolymerization processes of meso-epoxides with CO_(2),COS,or cyclic anhydrides via dissymmetrical ring-openings using multichiral catalytic systems,and affording isotactic copolymers with main-chain *** addition,this account provides a thorough mechanistic understanding of the high reactivities,excellent selectivity,and unprecedented stereochemical controls of these copolymerization systems,mediated by interand intramolecular synergistic catalysis.

关键词： Epoxide Ring-opening copolymerization Synergistic catalysis CO_(2) Stereochemistry control

Experimental Study on Working Performance of Rice Rope Direct Seeding Machine

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Agricultural Sciences in China 2010年第2期9卷 275-279页

作者： lu xiao-rong lu xiao-lian REN Wen-tao College of Information & Engineering Sichuan Agricultural University Ya'an 625014 P.R.China Department of Electronics & Information Chuzhou College Chuzhou 239000 P.R.China College of Engineering Shenyang Agricultural University Shenyang 110161 P.R.China

Structure and sowing principles of rice rope direct seeding machine are introduced. In order to test the machine＇ s working performance, such as compacting effect, sowing depth, influence of sowing device to rice rope, etc., field experiments were conducted. It is concluded that mean slip ratio of compacting wheel 1 is 4.44%, wheel 2 is 5.58%, wheel 3 is 7.81%, and wheel 4 is 6.96%; mean depth of planting is 29.72 mm, and mean variability coefficient of planting depth is 6.39%. Maximum variability coefficient of planting depth is 8.40%. Rice rope＇s snapping is closely related with the machine＇s speed and guide thread wheel by sowing device orthogonal experiments. Test results show that the machine has a rational design, safe work and meets to the requirements of planting. This study has laid the foundation for further studying the project.

关键词： rice rope direct seeding machine slip ratio planting depth sowing device experiments

Compressive behavior and energy absorption of metal porous polymer composite with interpenetrating network structure

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中国有色金属学会会刊：英文版 2006年第B2期16卷 439-443页

作者： LIU Yu GONG xiao-lu Institut Charles Delaunay CNRS FRE 2848 LASMIS UTT 12 rue Marie Curie BP 2060 10010 Troyes France

Interpenetrating phase composites (IPCs) are a new class of composite materials with improved combinations of mechanical and physical properties. This study was performed on a new type of IPC called metal porous polymer composite (MPPC) with an interpenetrating network structure. Aluminum-polypropylene (AI-PE) and Aluminum-epoxy resin (Al-Ep) composites were produced by infiltrating the polymer in the aluminum foam. The composite microstructures were characterized using SEM observation. The compressive behavior and energy absorption characteristics of MPPC were investigated and compared with the aluminum foams. The compressive modulus of composite was compared with the VOIGT-REUSS bounds and HASHIN-SHTRIKMAN (H-S) bounds models. The experimental modulus of compressive tests falls well within the theoretical models.

关键词：金属多孔聚合物复合物互穿网络结构压缩行为能量吸收 MPPC复合物