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Self-healing of microcapsule-based materials for highway construction:A review

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第3期10卷 368-384页

作者： Enlin Ma Xi Chen Jinxing lai Xiangze Kong Chunxia guo School of Highway Chang'an UniversityXi'an 710064China Department of Civil Engineering Aalto UniversityAalto 00076Finland Southwest Municipal Engineering Design&Research Institute of China Chengdu 610299China Department of Chemistry and Materials Science Aalto UniversityAalto 00076Finland School of Science Xi'an University of Architecture and TechnologyXi'an 710055China

Maintaining the health and reliability of civil facilities is of strategic *** highway engineering,pavement cracking impairs the road service and travel comfort level,while structure cracking can cause catastrophic ***-based self-healing materials offer solutions to auto-recovery micro-cracks and maintain structural *** solution has become available by laboratory synthesis and proved effective in addressing the cracking problem during long-term mechanical,thermal,and hydraulic ***,full-scale applications of this technique are not prevalent,showing its potential limitations in highway *** healing in highways is a big topic,therefore,this review has two insertion points.(1)We focus on the cracking issues on two specific materials:asphalt and concrete,which account for the vast majority of all the materials used in pavement and structures in highways.(2)Instead of the laboratory studies,we pay more attention to the practical applications,the meaning of healing performance,and the adverse effects of microcapsules to the main structural components(i.e.,tunnel lining,bridge piers and beams)and pavement in *** practical significance of self-healing materials in highway projects was discussed from the three aspects:strength,durability,and stress *** difficulty in applying this new technique is also discussed from economic *** future-proofing,a material evaluation system that fits the load condition is *** self-healing technique brings composites a chance to interact with the environment,showing high potential for contributing to the development of various types of long-lasting infrastructures.

关键词： Road engineering Self-healing material Structure cracking Micro-encapsulation Facility lifetime

Enhanced Photothermal Selective Conversion of CO_(2)to CH4 in Water Vapor over Rod-Like Cu and N Co-Doped TiO_(2)

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Chinese Journal of Structural Chemistry 2022年第12期41卷 33-42页

作者： Ji-Chao Wang Xiu qiao Weina Shi Huiling Gao Lingchen guo College of Chemistry and Chemical Engineering Henan Institute of Science and TechnologyXinxiang 453000China School of Chemistry and Materials Engineering Xinxiang UniversityXinxiang 453000China School of Ecology and Environment Zhengzhou UniversityZhengzhou 450052China

Enhancing catalytic efficiency and selectivity is critical issues for CO_(2) *** rod-like Cu/N co-doped TiO_(2) samples(Cu/N-TiO_(2)) were synthesized by the electrospinning-calcination *** substitutional Cu and interstitial N doping not only enhanced visible-light absorption ability,but also formed the Ti(Ⅲ)*** obviously synergistic effect between the photocatalysis and thermalcatalysis appeared for CO_(2) conversion over the 8-Cu/N-TiO_(2) *** 9 h visible-light-illumination at 160℃,the CO,CH4and O_(2) yields reached 49.7,1455.1 and 2910.2μmol/gcat,*** the 7thcycling,the yields of two main CH4and O_(2) products were slightly down by less than 11.5%,and the selectivity of CH_(4) product kept above 98%.Combined with the theoretical surface mode,Cu/N co-doping could promote the adsorption-ability for H_(2)O and CO_(2) molecules and reduce activation-energy for CO_(2)***,the co-doping construction showed a great significance of designing efficient photothermal catalysts for the CO_(2)conversion application.

关键词： CO_(2)conversion photothermal catalysis rod-like TiO_(2) co-doped

Dynamics of the spatiotemporal velocity of glaciers on the eastern slope of Mount Gongga,China,under climate change

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Advances in Climate Change Research 2024年第3期15卷 490-499页

作者： Yin FU Bo ZHANG qiao LIU guo-Xiang LIU Rui ZHANG Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610299China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China

The quantitative assessment of glacier flow velocity dynamics plays a pivotal role in understanding its response mechanisms concerning climate *** work provides a systematic quantitative assessment of the deceleration status of glaciers in this region by investigating the motion evolution of typical glaciers in Mount Gongga in recent years,thereby revealing the seasonal dynamics and inter-annual evolution over an extensive time *** used the optical flow-small baseline subset(OF-SBAS)method to compute the time-series velocities of the Hai-luogou Glacier and the Mozigou Glacier using 178 archived Sentinel-1 satellite synthetic aperture radar(SAR)images from 2014 to *** findings revealed a prominent seasonal pattern in glacier motion,characterised by cyclic variations in velocity from cold to warm ***,we identified variations in velocities across distinct regions of the glacier surface,underscored by the lag in the peak time node of glacier flow with increasing *** pattern may have been determined by a combination of internal and external factors,including mass accumulation and ablation-driven subglacial drainage,as well as the glacier geomorphological ***,during 2015-2021,the glaciers on the eastern slope of Mount Gongga exhibited an overarching trend of ***,the ablation area of the Hailuogou Glacier recorded the most substantial deceleration,exceeding 8%per *** study underscores the efficacy of the OF-SBAS method in extracting long-term glacier *** work also establishes a robust foundation for the analysis of spatiotemporal fluctuations in glacier movement within the context of climate warming.

关键词： Monsoonal temperate glaciers Synthetic aperture radar(SAR) Glacier movement Hailuogou glacier Mozigou glacier Optical flow-small baseline subset(OF-SBAS)

Recent advancement of flow-induced piezoelectric vibration energy harvesting techniques:principles,structures,and nonlinear designs

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 959-978页

作者： Dongxing CAO Junru WANG Xiangying guo S.K.lai Yongjun SHEN Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing 100124China School of Automation Beijing Information Science and Technology UniversityBeiing 100192China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Hong Kong Branch of National Rail Transit Electrification and Automation Engineering Technology Research Center The Hong Kong Polytechnic UniversityKowloonHong KongChina State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Energy harvesting induced from flowing fluids(e.g.,air and water flows)is a well-known process,which can be regarded as a sustainable and renewable energy *** addition to traditional high-efficiency devices(e.g.,turbines and watermills),the micro-power extracting technologies based on the flow-induced vibration(FIV)effect have sparked great concerns by virtue of their prospective applications as a self-power source for the microelectronic devices in recent *** article aims to conduct a comprehensive review for the FIV working principle and their potential applications for energy ***,various classifications of the FIV effect for energy harvesting are briefly introduced,such as vortex-induced vibration(VIV),galloping,flutter,and wake-induced vibration(WIV).Next,the development of FIV energy harvesting techniques is reviewed to discuss the research works in the past three *** application of hybrid FIV energy harvesting techniques that can enhance the harvesting performance is also ***,the nonlinear designs of FIV-based energy harvesters are reported in this study,e.g.,multi-stability and limit-cycle oscillation(LCO)***,advanced FIV-based energy harvesting studies for fluid engineering applications are briefly ***,conclusions and future outlook are summarized.

关键词： vibration-driven energy harvesting flow-induced vibration(FIV) piezoelectric approach nonlinear design

Robust adaptive precision motion control of tank horizontal stabilizer based on unknown actuator backlash compensation

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Defence Technology（防务技术） 2023年第2期20卷 72-83页

作者： Shu-Sen Yuan Wen-Xiang Deng Jian-Yong Yao guo-lai Yang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingChina

Backlash nonlinearity inevitably exists in the actuator of tank horizontal stabilizer and has adverse effect on the system control performance,however,how to effectively eliminate its effect remains a pending *** solve this problem,a robust adaptive precision motion controller is presented in this paper to address uncertainties and unknown actuator backlash of tank horizontal *** controller handles the modeling uncertainties including parameter uncertainties and unmodeled disturbances by integrating adaptive feedforward compensation and continuous nonlinear robust *** on the backstepping method,a smooth backlash inverse model is constructed by combining the adaptive ***,the unknown backlash parameters of the system can be approximated through the parameter adaptation,and the impact of the actuator backlash nonlinearity is effectively compensated via the inverse operation,which can availably improve the tracking ***,the adaptive law can update the disturbance ranges of tank horizontal stabilizer online in real time,which enhances the feasibility in practical engineering ***,the stability analysis based on Lyapunov function shows that with the existence of unmodeled disturbances and unknown actuator backlash,the designed controller guarantees excellent asymptotic output tracking *** comparative results verify the effectiveness of the proposed control strategy.

关键词： Tank Horizontal stabilizer Adaptive control Robust control Backlash inverse

Interval uncertain optimization for damping fluctuation of a segmented electromagnetic buffer under intensive impact load

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Defence Technology（防务技术） 2021年第3期17卷 884-897页

作者： Zi-xuan Li guo-lai Yang Feng-jie Xu Li-qun Wang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingPR China

Aiming at the problems of demagnetization effect of electromagnetic buffer(EMB)caused by high velocity under intensive impact load and the difficulty and error of machining composite thin-walled long tube,a segmented EMB is *** inner tube and air-gap are divided into initial segments and the traversing *** theoretical analysis,impact test and simulation,it can be found that the RRF curve has two ***,in order to reduce the resultant resistance force(RRF)peaks,the sensitivity analysis based on optimal Latin hypercube design(OLHD)and polynomial regression was *** results show that the smallest contribution ratio to the dynamic response is the seventh and ninth segments of the inner tube,which are less than 1%.Then,fully considering the uncertain factors,important parameters are selected for uncertain optimization after sensitivity *** interval order and interval probability degree methods are used to establish interval uncertain optimization model of the RRF considering *** model was solved using an interval nested optimization method based on radial basis function(RBF)neural ***,the Pareto front is obtained and numerical simulation is performed to verify the optimal *** indicates that the two kinds of RRF peak is obviously reduced,and the optimization object and strategy are effective.

关键词： EMB Intensive impact load Segmented Sensitivity analysis Interval uncertain Optimization

Irreversible demagnetization mechanism of permanent magnets during electromagnetic buffering

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Defence Technology（防务技术） 2021年第3期17卷 763-774页

作者： Zi-xuan Li guo-lai Yang Yu-meng Fan Jia-hao Li School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingPR China

The permanent magnets will be irreversibly demagnetized under high temperature and high velocity during the electromagnetic *** this study,the magnetic field induced by eddy currents and the self-demagnetizing field of permanent magnet are taken into consideration together for demagnetization *** magnetic Reynolds number is used to express the eddy currents *** correction coefficient being expressed as the index of the air-gap width,the inner cylinder thickness,iron pole axial length and the permanent magnet demagnetization coefficient is introduced by magnetic path analysis to represent the self-demagnetization effect and the demagnetization *** electromagnetic buffer(EMB)prototype is tested under intensive impact loads of different strengths at room *** accuracy of the nonlinear irreversible demagnetization finite element model is verified by demagnetization on damping force,velocity and ***,high-velocity demagnetization and high-temperature demagnetization are analysed in order to obtain the distribution law of irreversible demagnetization.

关键词： EMB Irreversibly demagnetization Magnetic Reynolds number Correction coefficient

Microstructural evolution and mechanical properties of a new Al-Cu-Li-X alloy at different solution temperatures

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Rare Metals 2021年第3期40卷 635-642页

作者： Long Zhang Zi-qiao Zheng Jin-Feng Li Cheng-Yu Tan Yong-lai Chen Xu-Hu Zhang School of Materials Science and Engineering Central South UniversityChangsha 410083China Aerospace Research Institute of Materials and Processing Technology Beijing 100076China

The micros tructural evolution and mechanical properties of a new Al-3.8 Cu-1.2 Li-0.4 Mg-0.4 Zn-0.4 Ag-0.3 Mn-X alloy treated at different solution temperatures were *** grain size was measured in optical micrograph(OM).The residual particles and the major precipitates were identified by electron probe microanalysis(EPMA),scanning electron microscopy(SEM) and transmission electron microscope(TEM),*** results show that the peak strength appears at 530℃/1 h+T6(165℃/20 h) and the values are 566.2 MPa(tensile strength) and 538.2 MPa(yield strength) with the elongation of 6.5 %.The strength of the alloy increases rapidly with the amount of the precipitates T1 and θ’ increasing when the solution temperature is530℃.The increase in density of precipitates is resulted from the residual particles Al2 Cu,and particles enriched with Cu,Mg,Zr and Ag dissolve into matrix gradually with the solution temperature ***,the number of precipitates decreases and part of the grain boundary weakens with a further increase in solution temperature from 540 to 550℃,leading to a decline of strength.

关键词： Solution treatment Precipitates Microstructure Al-Cu-Li alloys

Lateral strain tailoring in manganite homostructures assisted by atomic-flat freestanding membranes

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Nano Research 2023年第5期16卷 7829-7836页

作者： Yufei Wang Yuchen Zhu Shengru Chen Dongke Rong qiao Jin Er-Jia guo College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics&Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Complex oxide thin films exhibit intriguing phenomena due to the coupling between multiple degrees of freedom through interfacial structural *** tailoring of structural parameters determines unique band structure and phonon modes,regulating emergent magnetic and electrical properties of oxide ***,the construction of different strained and oriented domains in one intact oxide thin film is impossible using conventional *** we report the fabrication and quantitative structural analysis of La_(0.7)Sr_(0.3)MnO_(3)(LSMO)homostructures assisted by atomic-flat freestanding *** substrates and suspended membranes regulate the epitaxial strain and orientation of subsequently grown *** results demonstrate an ultrathin transition layer(~4 atomic layers)between freestanding membranes and LSMO films is formed due to the strain *** work offers a simple and scalable methodology for fabricating unprecedented innovative functional oxide homostructures through artificially controlled synthesis routes.

关键词： transmission electron microscopy oxide homostructure freestanding membranes manganites strain engineering