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Real-Time Control Strategy of Exoskeleton Locomotion Trajectory Based on Multi-modal Fusion

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Journal of Bionic Engineering 2023年第6期20卷 2670-2682页

作者： Tao Zhen lei yan College of Engineering Beijing Forestry UniversityNo.35East Qinghua RoadBeijing100083China

The exoskeleton robot is a typical man–machine integration system in the human *** ideal man–machine state is to achieve motion coordination,stable output,strong personalization,and reduce man–machine confrontation during *** order to achieve an ideal man–machine state,a Time-varying Adaptive Gait Trajectory Generator(TAGT)is designed to estimate the motion intention of the wearer and generate a personalized gait *** can enhance the hybrid intelligent decision-making ability under human–machine collaboration,promote good motion coordination between the exoskeleton and the wearer,and reduce metabolic *** important feature of this controller is that it utilizes a multi-layer control strategy to provide locomotion assistance to the wearer,while allowing the user to control the gait trajectory based on human–robot Interaction(HRI)force and locomotion *** this article,a Temporal Convolutional Gait Prediction(TCGP)model is designed to learn the personalized gait trajectory of the wearer,and the control performance of the model is further improved by fusing the predefined gait trajectory method with an adaptive interactive force control model.A human-in-the-loop control strategy is formed with the feedback information to stabilize the motion trajectory of the output joints and update the system state in real time based on the feedback from the inertial and interactive force *** experimental study employs able-bodied subjects wearing the exoskeleton for motion trajectory control to evaluate the performance of the proposed TAGT model in online *** from these evaluations demonstrate that the controller TAGT has good motor coordination and can satisfy the subject to control the motor within a certain range according to the walking habit,guaranteeing the stability of the closed-loop system.

关键词： Exoskeleton Multi-layer control strategy Human–machine collaboration Time-varying adaptive gait Hybrid intelligent

The Characteristics of Atmospheric Ice Nuclei Measured at Different Altitudes in the Huangshan Mountains in Southeast China

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Advances in Atmospheric Sciences 2014年第2期31卷 396-406页

作者： JIANG Hui YIN yan yanG lei yanG Shaozhong su Hang CHEN Kui Key Laboratory for Aerosol–Cloud–Precipitation of the China Meteorological Administration Nanjing University of Information Science and Technology Chinese Academy of Meteorological Sciences Key Laboratory of Meteorological Disaster of the Ministry of Education Nanjing University of Information Science and Technology

The concentration of ice nuclei （IN） and the relationship with aerosol particles were measured and analyzed using three 5-L mixing cloud chambers and a static diffusion cloud chamber at three altitudes in the Huangshan Mountains in Southeast China from May to September *** results showed that the mean total number concentration of IN on the highest peak of the Huangshan Mountains at an activation temperature （Ta） of-20℃C was 16.6 *** the supersaturation with respect to water （Sw） and with respect to ice （Si） were set to 5％,the average number concentrations of IN measured at an activation temperature of-20℃C by the static diffusion cloud chamber were 0.89 and 0.105 L-1,respectively.A comparison of the concentrations of IN at three different altitudes showed that the concentration of IN at the foot of the mountains was higher than at the peak.A further calculation of the correlation between IN and the concentrations of aerosol particles of different size ranges showed that the IN concentration was well correlated with the concentration of aerosol particles in the size range of 1.2-20 μ*** was also found that the IN concentration varied with meteorological conditions,such as wind speed,with higher IN concentrations often observed on days with strong *** analysis of the backward trajectories of air masses showed that low IN concentrations were often related to air masses travelling along southwest pathways,while higher IN concentrations were usually related to those transported along northeast pathways.

关键词： atmospheric ice nuclei mixing cloud chamber static diffusion cloud chamber deposition nucleation condensation freezing nucleation

Large eddy simulation study of 3D wind field in a complex mountainous area under different boundary conditions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第7期25卷 541-556页

作者： yan LI lei yan Xuhui HE School of Civil Engineering Central South UniversityChangsha410075China National Engineering Research Center for High-speed Railway Construction Changsha410075China Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures Changsha410075China

Large eddy simulations generally are used to predict 3D wind field characteristics in complex mountainous *** simulation boundary conditions,such as the height and length of the computational domain or the characteristics of inflow turbulence,can significantly impact the quality of *** this study,we examined these boundary conditions within the context of the mountainous terrain around a long-span cable-stayed bridge using a wind tunnel *** sizes of computational domains and turbulent incoming wind velocities were used in large eddy *** results show that when the height of the computational domain is five times greater than the height of the terrain model,there is minimal influence from the top wall on the wind field characteristics in this complex mountainous *** the length of the wake region of the computational domain has negligible effects on the wind *** in the inlet boundary reduces the length of the wake region on a leeward hill with a low slope,but has less impact on the mean wind velocity of steep hills.

关键词： Large eddy simulation(LES) Spectral representation method Recycling method High mountainous canyon Wind characteristics Atmospheric boundary layer Computational domain

Nuclear Localized O-Fucosyltransferase SPY Facilitates PRR5 Proteolysis to Fine-Tune the Pace of Arabidopsis Circadian Clock

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Molecular Plant 2020年第3期13卷 446-458页

作者： yan Wang Yuqing He Chen su Rodolfo Zentella Tai-ping sun lei Wang Key Laboratory of Plant Molecular Physiology CAS Center for Excellence in Molecular Plant SciencesInstitute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Department of Biology Duke UniversityDurhamNC 27708USA

Post-translational modifications play essential roles in finely modulating eukaryotic circadian clock *** plants,the effects of O-glycosylation on the circadian clock and the underlying mechanisms remain largely *** O-fucosyltransferase SPINDLY(SPY)and the O-GIcNAc transferase SECRET AGENT(SEC)are two prominent O-glycosylation enzymes in higher plants,with both overlapped and unique functions in plant growth and *** the critical role of O-GIcNAc in regulating the animal circadian clock,here we report that nuclear-localized SPY,but not SEC,specifically modulates the pace of the Arabidopsis circadian *** identifying the interactome of SPY,we identified PSEUDORESPONSE REGULATOR 5(PRR5),one of the core circadian clock components,as a new SPY-interacting ***5 can be O-fucosylated by SPY in pianta,while point mutation in the catalytic domain of SPY abolishes the O-fucosylation of *** protein abundance of PRR5 is strongly increased in spy mutants,while the degradation rate of PRR5 is much reduced,suggesting that PRR5 proteolysis is promoted by SPY-mediated ***,multiple lines of genetic evidence indicate that PRR5 is a major downstream target of SPY to specifically mediate its modulation of the circadian ***,our findings provide novel insights into the specific role of the O-fucosyltransferase activity of SPY in modulating the circadian clock and implicate that O-glycosylation might play an evolutionarily conserved role in modulating the circadian clock system,via O-GIcNAcylation in mammals,but via O-fuco-sylation in higher plants.

关键词： circadian clock O-fucosyltransferase SPY proteolysis PRR5

量子化学计算法对合成中4个芳香重氮盐稳定性的分析

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海峡药学 2013年第8期25卷 186-188页

作者：苏彦雷刘建芳林克江蒋建勤白求恩国际和平医院药剂科石家庄050082 中国药科大学天然药物化学教研室南京211198 中国药科大学药物化学教研室南京210009

探讨实验合成过程中芳香重氮盐相对不稳定的原因,用量子化学计算法对目标化合物进行解析计算,分析对比了N-C键级大小以及与重氮基团相连接C原子的电负性大小,推断解释了芳香重氮盐2M相对不稳定的原因,希望本报道能对今后的一些实验研究... 详细信息

探讨实验合成过程中芳香重氮盐相对不稳定的原因,用量子化学计算法对目标化合物进行解析计算,分析对比了N-C键级大小以及与重氮基团相连接C原子的电负性大小,推断解释了芳香重氮盐2M相对不稳定的原因,希望本报道能对今后的一些实验研究提供参考。

关键词：重氮盐稳定性量子化学计算法

Strategic integration of 2D perovskite and chiral quantum dot hybrid heterostructures for superior CPL detection

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Science China Technological Sciences 2025年第1期 368-377页

作者： Jiahe yan Xi ZHANG lei LIU Hualin BI Mengke WANG Jing LI Jun WANG Department of Chemistry College of SciencesNortheastern University Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Circularly polarized light（CPL） detection has garnered significant research interest due to its extensive applications in optoelectronics and quantum *** perovskites possess CPL detection capabilities due to their inherent ***,incorporating organic amine spacers distorts the crystal lattice,resulting in defects that reduce the sensitivity of CPL *** study introduces the concept of chiral superposition for the first time,reporting two mixed heterostructures composed of two-dimensional（2D） chiral perovskite（R/S-MBA）2MAPb2I7（R/S）,chiral quantum dots（R/S-MBA）-CsPbBr3（R/SQD）,and chiral carbon dots（Ch-CDs）.The addition of chiral quantum dots/Ch-CDs fills the defects of the chiral perovskite films and reduces the electron-hole recombination rate in chiral hybrid perovskites,thereby significantly enhancing the circularly polarized sensitivity of the CPL *** adjusting the concentration of chiral quantum dots,controllability of spin electron transfer is achieved,which has a notable impact on circular dichroism（CD） and anisotropy factor *** anisotropy factor glhpof the mixed heterostructure R/S-R/SQD is approximately 21.58 times higher than that of single-phase chiral perovskites,and the asymmetry factor gCDincreases ***,this work opens up a new effective pathway for achieving high-sensitivity CPL detection,with promising applications in optoelectronic technologies such as spin information communication and quantum optics.

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H_(∞)/Passive Synchronization of Semi-Markov Jump Neural Networks subject to Hybrid Attacks via an Activation Function Division Approach

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Journal of Systems Science & Complexity 2024年第3期37卷 1023-1036页

作者： ZHANG Ziwei SHEN Hao su lei School of Electrical and Information Engineering Anhui University of TechnologyMa'anshan 243002China Anhui Province Key Laboratory of Special Heavy Load Robot and School of Electrical and Information Engineering Anhui University of TechnologyMa'anshan243002China

In this work,an H_(∞)/passive-based secure synchronization control problem is investigated for continuous-time semi-Markov neural networks subject to hybrid attacks,in which hybrid attacks are the combinations of denial-of-service attacks and deception attacks,and they are described by two groups of independent Bernoulli *** this foundation,via the Lyapunov stability theory and linear matrix inequality technology,the H_(∞)/passive-based performance criteria for semi-Markov jump neural networks are ***,an activation function division approach for neural networks is adopted to further reduce the conservatism of the ***,a simulation example is provided to verify the validity and feasibility of the proposed method.

关键词： Activation function division approach deception attacks denial-of-service attacks H_(∞)/passive synchronization semi-Markov jump neural networks

Finite element analysis of stress corrosion cracking for copper in an ammoniacal solution

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Rare Metals 2015年第6期34卷 426-430页

作者： Wen-Wen Wang Ji Luo lei-Chen Guo Zhi-Meng Guo yan-Jing su Institute of Advanced Materials and Technology University of Science and Technology Beijing School of Engineering Rensselaer Polytechnic Institute

Finite element analyses including a cohesive zone model （CZM） were conducted to investigate the role of corrosion product films （CPFs） in stress corrosion cracking （SCC） for copper in an ammoniacal solution. It is found that a tensile CPF-induced stress generates near the interface between the CPF and the copper substrate at the substrate side in front of the notch tip for a U-shaped edgenotched specimens. The CPF-induced stress is superimposed on the applied stress to enhance emission and motion of dislocations. The peak opening stress （S11） increases with an increase in CPF thickness and a decrease in CPF Young＇s modulus. Damage mechanics based on the CZM was applied to study the stress corrosion crack initiation and propagation by analyzing the stress redistributions and load-displacement curves. The results show that the crack initiates first in the CPF and then propagates to the copper substrate. The fracture strain of the specimen covered a CPF is lower than that without a CPF. Based on the simulation results, the mechanism of the CPF-induced SCC, which promoted the initiation and propagation of the stress corrosion cracks, was discussed.

关键词： Stress corrosion cracking Finite elementanalysis Corrosion product film-induced stress Corrosionproduct films

Recent advances in transition metal chalcogenides for lithium-ion capacitors

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Rare Metals 2022年第9期41卷 2971-2984页

作者： lei Wang Xiong Zhang Chen Li Xian-Zhong sun Kai Wang Fang-Yuan su Fang-yan Liu yan-Wei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing100049China Institute of Electrical Engineering and Advanced Electromagnetic Drive Technology Qilu ZhongkeJinan250013China Dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian116023China CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Transition metal chalcogenides(TMCs)and TMCs-based nanocomposites have attracted extensive attention due to their versatile material species,low cost,and rich physical and chemical *** anode materials of lithium-ion capacitors(LICs),TMCs have exhibited high theoretical capacities and pseudocapacitance storage ***,there are many intrinsic challenges,such as low electrical conductivity,repeatedly high-volume changes and sluggish ionic diffusion ***,many traditional and unconventional techniques have been reported to solve these critical problems,and many innovative strategies are also used to prepare high quality anode materials for *** this mini review,a detailed family member list and comparison of TMCs in the field of lithium-ion capacitors have been summarized ***,many rectification stratagems and recent researches of TMCs have been exhibited and *** the end,as an outcome of these discussions,some further challenges and perspectives are envisioned to promote the application of TMCs materials for lithium-ion c apacitors.

关键词： Energy storage Transition metal chalcogenides(TMCs) Lithium-ion capacitors(LICs) Performance optimization