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Frontiers of Structural and Civil Engineering 2021年第3期15卷 576-594页

作者： peng ZHU Jiajing XU Wenjun qu Department of Structural Engineering Tongji UniversityShanghai200092China School of Transportation and Civil Engineering Nantong UniversityNantong226019China

Reinforced concrete beams consisting of both steel and glass-fiber-reinforced polymer rebars exhibit excellent strength,serviceability,and ***,the fatigue shear performance of such beams is ***,beams with hybrid longitudinal bars and hybrid stirrups were designed,and fatigue shear tests were *** specimens that failed by fatigue shear,all the glass-fiber-reinforced polymer stirrups and some steel stirrups fractured at the critical diagonal *** the specimen that failed by the static test after 8 million fatigue cycles,the static capacity after fatigue did not significantly decrease compared with the calculated *** initial fatigue level has a greater influence on the crack development and fatigue life than the fatigue level in the later *** fatigue strength of the glass-fiber-reinforced polymer stirrups in the specimens was considerably lower than that of the axial tension tests on the glass-fiber-reinforced polymer bar in air and beam-hinge tests on the glass-fiber-reinforced polymer bar,and the failure modes were ***-fiber-reinforced polymer stirrups were subjected to fatigue tension and shear,and failed owing to shear.

关键词： fatigue shear hybrid stirrups hybrid reinforcement fiber-reinforced polymer

Long-term effects of electrochemical realkalization on carbonated concrete

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 127-137页

作者： peng ZHU Ji ZHANG Wenjun qu College of Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures Shanghai 200092China

The long-term effects of electrochemical realkalization on carbonated reinforced concrete with a W/C ratio of 0.65 were *** out of 16 carbonated specimens had been subjected to realkalization seven years ago,and the alkalinity of the concrete,the electrochemical characters(corrosion current density and potential)of the specimens and the corrosion conditions of the steel bars were *** of different specimens and also at different time(4,10,13 months and 7 years after realkalization)were *** to the phenolphthalein and pH meter test,the alkalinity of the concrete had disappeared after seven *** on the potentiodynamic polarization test,various corrosion conditions had developed on the steel bars,which was verified by visual *** bars were in the depassivated state,and their corrosion current densities increased significantly after seven *** developed in some of the specimens,and the diverse compactness of concrete and excessive current of realkalization were considered to be possible *** effects of the realkalization treatment vanished after seven years.

关键词： realkalization concrete carbonation polarization curve corrosion

A comparative proteomics approach to detect unintended effects in transgenic Arabidopsis

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Journal of Genetics and Genomics 2009年第10期36卷 629-639页

作者： Yanfei Ren Jun Lv hua Wang Linchuan Li Yufa peng Li-Jia qu National Key Laboratory of Protein Engineering and Plant Genetic Engineering College of Life Sciences Peking University Beijing 100871 China lnstitute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100193 China

Recently, as part of biosafety assessments, unintended effects have been given much attention. In this study, we applied a proteomics approach to elucidate the unintended effects of random T-DNA insertion in transgenic plants. Separated proteins extracted from 12 transgenic Arabidopsis thaliana with different T-DNA insertion sites and from wild-type （ecotype Col-o） were analyzed. In the transgenic plants, 102 significantly altered protein spots were detected, in which 59 were up-regulated and 43 down-regulated. MALDI-TOF MS analysis showed that most of these expression level-altered proteins were involved in energy transfer, oxidative respiration and photosynthesis. However, none of these proteins was a toxic protein or allergen. Using plants with or without cold treatment, a natural environmental stress, as controls, we found that the number of the altered proteins was even less in those transgenic plants than those triggered by the cold treatment, suggesting that the transgenic events had a weaker impact on the plants than the environmental stresses. Interestingly, the phosphinothricin acetyl transferase （PAT）, the BAR-encoded protein, was detected in nine out of twelve different T-DNA insertion lines at five different insertion sites. These data suggest that the most significant impact of transgenic events on the host plants is from the transgene itself, i.e., from the predictable intended effects, rather than unintended effects. This study also suggests that the proteomics approach has the potential to detect the unintended effects in transgenic plants.

关键词： biosafety proteomics Arabidopsis thaliana 2-D PAGE MALDI-TOF unintended effect

Towards“General Purpose”Brain-Inspired Computing System

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Tsinghua Science and Technology 2021年第5期26卷 664-673页

作者： Youhui Zhang peng qu Weimin Zheng the Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

Brain-inspired computing refers to computational models,methods,and systems,that are mainly inspired by the processing mode or structure of brain.A recent study proposed the concept of"neuromorphic completeness"and the corresponding system hierarchy,which is helpful to determine the capability boundary of brain-inspired computing system and to judge whether hardware and software of brain-inspired computing are compatible with each *** a position paper,this article analyzes the existing brain-inspired chips design characteristics and the current so-called"general purpose"application development frameworks for brain-inspired computing,as well as introduces the background and the potential of this ***,some key features of this concept are presented through the comparison with the Turing completeness and approximate computation,and the analyses of the relationship with"general-purpose"brain-inspired computing systems(it means that computing systems can support all computable applications).In the end,a promising technical approach to realize such computing systems is introduced,as well as the on-going research and the work *** believe that this work is conducive to the design of extensible neuromorphic complete hardware-primitives and the corresponding *** this basis,it is expected to gradually realize"general purpose"brain-inspired computing system,in order to take into account the functionality completeness and application efficiency.

关键词： brain-inspired computing neuromorphic computing computational completeness hardware/software decoupling system hierarchy

A Novel Fractional Plastic Damage Model for quasi-brittle Materials

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Acta Mechanica Solida Sinica 2021年第5期34卷 706-717页

作者： peng-Fei qu Qi-Zhi Zhu Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China College of Civil and Transportation Engineering Hohai UniversityNanjing210098China

In this work,a novel constitutive model is developed within the framework of fractional plasticity to delineate the coupling between inelastic deformation and damage of quasi-brittle *** with the common challenge of determining plastic flow direction,we resort herein to the Riemann–Liouville definition of fractional derivatives,instead of introducing an additional plastic *** pre-peak hardening behavior is described using an exponential function,while the post-peak softening response is viewed as the consequence of material *** describing damage evolution,a damage criterion is constructed in terms of plastic volume dilation related to micro-crack *** is conducive to supply a new insight for describing the complex influence of the non-orthogonality of plastic flow on damage *** numerical applications,a semi-implicit return mapping algorithm is *** predictive performance of the model is evaluated by comparing numerical simulations with experimental data under various loading paths.

关键词： quasi-brittle materials Fractional plasticity Damage Dilatancy Numerical algorithm

Mechanisms and applications of layer/spinel phase transition in Li-and Mn-rich cathodes for lithium-ion batteries

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Rare Metals 2022年第5期41卷 1456-1476页

作者： Wei He Qing-Shui Xie Jie Lin Bai-hua qu Lai-Sen Wang Dong-Liang peng State Key Laboratory of Physical Chemistry of Solid Surface Fujian Key Laboratory of Materials GenomeCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

Li-and Mn-rich(LMR)cathode materials have received tremendous attention due to the highly reversible specific capacity(>250 m Ah·g^(-1)).In the analysis of its crystal structure,the two-phase composite model gains increasing acceptance,and the phase transition behaviors in LMR cathode materials have been extensively ***,the structure controversy of LMR cathode materials,and the mechanisms of phase transition are ***,the causes of initiating or accelerating the phase transition of LMR cathode materials have been summarized into three main driving forces,i.e.,the electrochemical driving force,the component driving force and the thermodynamic driving ***,the applications of phase transition behavior in improving the electrochemical performance of LMR cathode materials,including the construction of spinel surface coating and spinel/layered hetero-structure are discussed.

关键词： Li-and Mn-rich cathode material Two-phase composite model Phase transition Spinel/layered hetero-structure

Global Exact Boundary Controllability for General First-Order quasilinear Hyperbolic Systems

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Chinese Annals of Mathematics,Series B 2015年第6期36卷 895-906页

作者： Cunming LIU peng qu Department of Mathematics Taiyuan University of Technology School of Mathematical Sciences Fudan University

For general first-order quasilinear hyperbolic systems,based on the analysis of simple wave solutions along characteristic trajectories,the global two-sided exact boundary controllability is achieved in a relatively s... 详细信息

关键词： Global exact boundary controllability General quasilinear hyperbolicsystem Simple wave solution Characteristic trajectory Short control-ling time

Global Classical Solutions to Partially Dissipative quasilinear Hyperbolic Systems with One Weakly Linearly Degenerate Characteristic

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Chinese Annals of Mathematics,Series B 2012年第3期33卷 333-350页

作者： peng qu Cunming LIU School of Mathematical Sciences Fudan UniversityShanghai 200433China

For a kind of partially dissipative quasilinear hyperbolic systems without Shizuta-Kawashima condition,in which all the characteristics,except a weakly linearly degenerate one,are involved in the dissipation,the globa... 详细信息

关键词： Global classical solution quasilinear hyperbolic system Weak lineardegeneracy Partial dissipation

CFD simulations for longwall gas drainage design optimisation

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International Journal of Mining Science and Technology 2017年第5期27卷 777-782页

作者： Qin Johnny qu Qingdong Guo hua Coal Mining Research Program The Commonwealth Scientific and Industrial Research Organisation(CSIRO)Brisbane 883Australia

Computational fluid dynamics(CFD) simulation is an effective approach to develop and optimise gas drainage design for underground longwall coal mining. As part of the project supported by the Australian Government Coal Mining Abatement Technology Support Package(CMATSP), threedimensional CFD simulations were conducted to test and optimise a conceptual design which proposes using horizontal boreholes to replace vertical boreholes at an underground coal mine in *** performance between a vertical borehole and a horizontal borehole was first carried out to compare their capacity and effectiveness. Then a series of cases with different horizontal borehole designs were simulated to optimise borehole configuration parameters such as location, diameter, and number of boreholes. The study shows that the horizontal borehole is able to create low pressure sinks that protect the workings from goaf gas ingresses by changing goaf gas flow directions, and that it has the advantage to continuously maintain such low pressure sinks near the tailgate as the longwall advances. An example of optimising horizontal borehole locations in the longwall lateral direction is also given in this paper.

关键词： Goaf gas drainage Horizontal borehole CFD simulation Design optimisation Mining abatement technology

Performance Tradeoff Between Energy Conservation and User Fairness for D2D Communication Underlaying Cellular Networks

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Chinese Journal of Electronics 2017年第3期26卷 600-607页

作者： TANG Rui ZHAO Jihong qu hua School of Electronics and Information Engineering Xi'an Jiaotong University School of Communication and Information Engineering Xi'an University of Posts and Telecommunications

Device-to-Device(D2D)communication is viewed as an emerging technology in the fifth generation systems to fully explore the proximate gain residing in local communicating *** the interference imposed to the existing Cellular links(C-link)should be addressed in the optimization for underlaid D2D links(D-link).There is a performance tradeoff between Energy conservation(EC)and the number of links with satisfied quality-of-service(Qo S)requirement or System capacity(SC).We aim to weight the above tradeoff for D-links by specifying it into optimizing EC on the condition that SC is maximized and Qo S requirements of C-links are fully guaranteed.A threestage joint power control and channel assignment mechanism is proposed including feasibility check,SC maximization and greedy optimization for *** to numerical results,we illustrate the necessity to conduct our performance tradeoff and observe the gain when multiple resource variables are in elaborate cooperation.

关键词： Device-to-Device(D2D) communication Energy conservation User fairness Resource allocation