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THEORETICAL MODEL ON INTERFACE FAILURE MECHANISM OF REINFORCED CONCRETE CONTINUOUS BEAM STRENGTHENED BY FRP

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Acta Mechanica Solida Sinica 2009年第2期22卷 161-170页

作者： hong Yuan Zifeng lin MOE Key Lab of Disaster Forecast and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou 510632 China

Fiber reinforced polymer （FRP） composites are increasingly being used for the re-pair and strengthening of deteriorated concrete structural components through adhesive bonding of prefabricated strips/plates and the wet lay-up of fabric. Interfacial bond failure modes have attracted the attention of researchers because of the importance. The objective of the present study is to analyse the interface failure mechanism of reinforced concrete continuous beam strength-ened by FRP. An analytical solution has been firstly presented to predict the entire debonding process of the model. The realistic bi-linear bond-slip interfacial law was adopted to study this problem. The crack propagation process of the loaded model was divided into four stages （elastic,elastic-softening,elastic-softening-debonded and softening-debonded stage）. Among them,elastic-softening-debonded stage has four sub-stages. The equations are solved by adding suitable stress and displacement boundary conditions. Finally,critical value of bond length is determined to make the failure mechanism in the paper effective by solving the simultaneously linear algebraic equations. The interaction between the upper and lower FRP plates can be neglected if axial stiffness ratio of the concrete-to-plate prism is large enough.

关键词： FRP interface bond-slip law critical length continuous beam ultimate load

Molecular regulation and genetic control of rice thermal response

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The Crop Journal 2021年第3期9卷 497-505页

作者： Yi Kan hong-Xuan lin National Key Laboratory of Plant Molecular Genetics CAS Centre for Excellence in Molecular Plant Sciences and Collaborative Innovation Center of Genetics&DevelopmentShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China

Global warming threatens food ***(Oryza sativa L.),a vital food crop,is vulnerable to heat stress,especially at the reproductive *** we summarize putative mechanisms of high-temperature perception(via RNA secondary structure,the phyB gene,and phase separation)and response(membrane fluidity,heat shock factors,heat shock proteins,and ROS(reactive oxygen species)scavenging)in *** describe how rice responds to heat stress at different cell-component levels(membrane,endoplasmic reticulum,chloroplasts,and mitochondria)and functional levels(denatured protein elimination,ROS scavenging,stabilization of DNA and RNA,translation,and metabolic flux changes).We list temperature-sensitive genetic male sterility loci available for use in rice hybrid breeding and explain the regulatory mechanisms associated with some of *** thermotolerant rice species without yield penalties via natural alleles mining and transgenic editing should be the focus of future work.

关键词： Rice Thermotolerance Thermal response Thermosensitivity Molecular regulation

Energy dissipation mechanism and experiment of particle dampers for gear transmission under centrifugal loads

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Particuology 2016年第4期14卷 40-50页

作者： Wangqiang Xiao Yuxiang Huang hong Jiang hong lin Jiani Li Department of Mechanical and Electrical Engineering Xiamen University Xiamen 361005 China Beijing Institute of Electronic System Engineering Beijing 100854 China Beijing Institute of Astronautical Systems Engineering Beijing 100076 China

As a passive means of vibration reduction, particle damping is mainly applied to the horizontal or vertical steady field. However, it is seldom applied to centrifugal fields. Under high speed and heavy loading, the vibration of tooth surfaces of gear transmissions becomes more severe shortening gear service life and augmenting noise. Under centrifugal loading, the particle system exhibits different characteristics, for example, particles are extruded at the end farthest from the center. We investigated gears with drilled via holes filled with damping particles. Using the discrete-element method, we developed an energy dissipation model for the particle system accounting for friction and inelastic collisions. Energy dissipation and damping characteristics of this system were analyzed. Experiments were also conducted with the gear system having different particle filling rates. The results show that this filling rate is an important parameter associated with particle damping in a centrifugal field. An unsuitable filling rate would significantly reduce damping effectiveness. With changes in rotation speed and load, the gear transmission system has different optimal filling rates. The results provide guidelines for the application of particle damping in centrifugal fields of gear transmissions.

关键词： Centrifugal field Gear transmission Particle damping Discrete element method Vibration reduction

Block Sparse Recovery via Mixed l_2/l_1 Minimization

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Acta Mathematica Sinica,English Series 2013年第7期29卷 1401-1412页

作者： Jun hong lin Song LI Department of Mathematics Zhejiang University

We consider efficient methods for the recovery of block sparse signals from underdetermined system of linear equations. We show that if the measurement matrix satisfies the block RIP with δ2s 〈 0.4931, then every block s-sparse signal can be recovered through the proposed mixed l2/ll-minimization approach in the noiseless case and is stably recovered in the presence of noise and mismodeling error. This improves the result of Eldar and Mishali （in IEEE Trans. Inform. Theory 55： 5302-5316, 2009）. We also give another sufficient condition on block RIP for such recovery method： 58 〈 0.307.

关键词： Compressed sensing block RIP block sparsity mixed l2/l1 minimization

Extended Mapping Transformation Method and Its Applications to Nonlinear Partial Differential Equation（s）

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Communications in Theoretical Physics 2005年第3X期44卷 473-478页

作者： ZHAO hong BAI Cheng-lin Physics Science and Information Engineering School Liaocheng University Liaocheng 252059 China

In this paper, we extend the mapping transformation method through introducing variable *** means of the extended mapping transformation method, many explicit and exact general solutions with arbitrary functions for some nonlinear partial differential equations, which contain solitary wave solutions, trigonometric function solutions, and rational solutions, are obtained.

关键词： nonlinear partial differential equations extended mapping transformation method exact solutions

On the Upper Bounds of the Numbers of Perfect Matchings in Graphs with Given Parameters

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Acta Mathematicae Applicatae Sinica 2007年第1期23卷 155-160页

作者： hong lin Xiao-feng Guo School of Mathematical Sciences Xiamen University Xiamen 361005 China

Let φ（G）, κ（G）, α（G）, χ（G）, cl（G）, diam（G） denote the number of perfect matchings, connectivity, independence number, chromatic number, clique number and diameter of a graph G, respectively. In this note, by constructing some extremal graphs, the following extremal problems are solved： 1. max {φ（G）：｜V（G）｜ = 2n, κ（G）≤ k} = k[（2n - 3）!!], 2. max{φ（G）：｜V（G）｜ = 2n,α（G） ≥ k} =[∏ i=0^k-1 （2n - k-i]（2n - 2k - 1）!!], 3. max{φ（G）：｜V（G）｜=2n, χ（G） ≤ k} =φ（Tk,2n） Tk,2n is the Turán graph, that is a complete k-partitc graph on 2n vertices in which all parts are as equal in size as possible, 4. max{φ（G）：｜V（G）｜ = 2n, cl（G） = 2} = n!, 5. max{φ（G）：｜V（G）｜ = 2n, diam（G） ≥〉 2} = （2n - 2）（2n - 3）[（2n - 5）!!], max{φ（G）：｜V（G）｜ = 2n, diam（G） ≥ 3} = （n - 1）^2[（2n - 5）!!].

关键词： Perfect matching connectivity chromatic number clique number diameter

Creating future crops:a revolution for sustainable agriculture

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Journal of Genetics and Genomics 2021年第2期48卷 97-101页

作者： Tao Guo hong-Xuan lin National Key Laboratory of Plant Molecular Genetics CAS Centre for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology Shanghai Tech UniversityShanghai 201210China

Despite the remarkable increase in food supply over the past halfcentury,global food security is facing unprecedented challenges as a result of a blooming human population,a shortage of arable land,and the significant threat posed by climate change(Bailey-Serres et al.,2019;Tian et al.,2020).Current crop production strategies are insufficient to nourish the world *** ensure food security and the development of sustainable abuilding to explore emerging strategies and design novel crops with high productivity and efficiency,which are also more resilient to climate variability and natural disasters.

关键词： crops sustainable spite

Interconnections between the Asian monsoon,ENSO,and high northern latitude climate during the Holocene

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Chinese Science Bulletin 2006年第18期51卷 2169-2177页

作者： hong Bing lin Qinghua hong Yetang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

The article emphatically reviews the research progress in interconnections between the East Asian and Indian Ocean summer monsoons, between the Asian monsoon and the El Ni?o-South- ern Oscillation (ENSO) activity, and between the monsoon, ENSO and the changing of the North At- lantic climate during the Holocene. According to the studies of recent years, it is found that the intensity variations of the East Asian and Indian Ocean sum- mer monsoons show an opposite relationship, which may be closely related to the phenomena of ENSO in the equatorial Pacific Ocean and the variation of the deep-water formation of the North Atlantic Ocean on the interannual to orbital time scales. The 4k and 8k events occurring at around 4200 and 8200 a BP, re- spectively, might be the two in a series of severe pa- leo-El Ni?o events during the Holocene, strongly re- flecting the interactions and influences of the mon- soons, ENSO and the North Atlantic climate. In order to better understand the relationships between these paleoclimatic phenomena, scientists need to strengthen the research work on the Asian monsoon division and the comparison between monsoon proxy records, and the study on the proxy record of sea surface temperature with high time-resolution in the equatorial Pacific Ocean and the simulation research of paleoclimate condition.

关键词：亚洲季风季风分划 ENSO 全新世

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Bispinor Space

Acta Mathematica Sinica,English Series 2007年第9期23卷 1629-1638页

作者： lin ZHU Xiu hong FENG Yan lin YU Department of Mathematics School of Science Suzhou University Suzhou 215006 P. R. China

In this paper, we give identifications of bispinor space with Grassmann algebra, and with Clifford algebra. The multiplication in Clifford algebra provides an action on them. Lastly we have researched on the geometry ... 详细信息

关键词： spinor bispinor Clifford algebra Jack map