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Second-Order Sliding Mode Controller Design with a Larger Domain of Attraction

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Journal of Systems Science & Complexity 2020年第1期33卷 61-73页

作者： MEI Keqi DING Shihong yang xiaofei MA Li School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China School of Electronics and Information Jiangsu University of Science and TechnologyZhenjiang 212003China

In this paper,by combining a second-order sliding mode(SOSM)algorithm with the saturation technique,a novel SOSM control scheme has been *** feature of the proposed SOSM controller lies that there is a saturation function imposed on the sliding variable,which could significantly enlarge the domain of attraction for the closed-loop *** geometric method has been utilized to prove that all the sliding variables will be steered to the origin in a finite ***,the relation between the control parameters and the shape of the phase trajectory has also been ***,the proposed method has been applied to the tracking control problem for a robotic manipulator.

关键词： Finite-time convergence second-order sliding mode stabilization

Regulation and function of histone acetyltransferase MOF

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Frontiers of Medicine 2014年第1期8卷 79-83页

作者： yang yang xiaofei Han Jingyun Guan Xiangzhi Li Key Laboratory of Experimental Teratology Ministry of Education Department of Cell Biology Shandong University School of MedicineJinan 250012 China

The mammalian MOF （male absent on the first）, a member of the MYST （MOZ, YBF2, SAS2, and Tip60） family of histone acetyltransferases （HATs）, is the major enzyme that catalyzes the acetylation of histone H4 on lysine 16. Acetylation of K16 is a prevalent mark associated with chromatin decondensation. MOF has recently been shown to play an essential role in maintaining normal cell functions. In this study, we discuss the important roles of MOF in DNA damage repair, apoptosis, and tumorigenesis. We also analyze the role of MOF as a key regulator of the core transcriptional network of embryonic stem cells.

关键词： MOF histone acetyltransferase DNA damage repair tumorigenesis embryonic stem cells

Synergism of 1D CdS/2D Modified Ti_(3)C_(2)T_(x) MXene Heterojunctions for Boosted Photocatalytic Hydrogen Production

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Chinese Journal of Structural Chemistry 2022年第8期41卷 58-64页

作者： Shi Cheng Qianqian Xiong Chengxiao Zhao xiaofei yang College of Science Nanjing Forestry UniversityNanjing 210037China

Rational design and controllable synthesis of visible-light-responsive photocatalysts that exhibit both good hydrogen-producing efficiency and stability in the water splitting reaction are undoubtedly a challenge. Here we report an integrated CdS nanorod/oxygen-terminated Ti_(3)C_(2)T_(x) MXene nanosheet heterojunction with a high catalytic hydrogen evolution reaction(HER) activity. By incorporating one-dimensional(1D)CdS nanorods onto annealed ultrathin two-dimensional(2D) MXene nanosheets, the mixed-dimensional 1D/2D heterojunction achieved a hydrogen-evolving rate of 8.87 mmol·g^(-1)·h^(-1), much higher than that of bulk CdS and CdS/unmodified MXene hybrid catalysts. The enhanced HER activity and stability of the designed heterojunction catalyst are attributed to the presence of oxygen-containing terminal groups on the surface of thermally treated Ti_(3)C_(2)T_(x) MXene, extended light absorption spectra as well as the precisely constructed intimate Schottky contact, implying an accelerated interfacial charge transfer and efficient, long-term photocatalytic hydrogen production performance. The results demonstrate that oxygen-terminated 2D MXene can be well utilized as a functional platform for the development of novel heterojunction photocatalysts.

关键词： CdS MXene heterojunction water splitting hydrogen evolution reaction

Trajectory-tracking control of an unmanned surface vehicle based on characteristic modelling approach:Implementation and field testing

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IET Cyber-Systems and Robotics 2023年第2期5卷 15-26页

作者： Yuhang Meng Hui Ye xiaofei yang College of Automation Jiangsu University of Science and TechnologyZhenjiangChina

In this study,a practical adaptive control scheme is proposed for the trajectory tracking of an unmanned surface vehicle via the characteristic modelling ***,accurate tracking control can be achieved in the presence of unknown time‐varying model parameters and environmental *** control scheme comprises a trajectory guidance module based on the virtual target approach and a tracking control module designed by characteristic modelling ***,the ideal control commands of the yaw speed and surge speed are generated using the position errors between the vehicle and the virtual ***,a second‐order characteristic model for the heading and surge speed channel is *** parameters of the model are updated by a real‐time parameter identification *** on this model,an integrated adaptive control law is designed which consists of golden‐section control,feed‐forward control and integral ***,the development processes of the vehicle platform and the control algorithms are described,and the results of simulation and field experiments are presented and discussed.

关键词： adaptive control characteristic model trajectory-tracking unmanned surface vehicle

ntercellular protein-protein interactions at synapses

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Protein & Cell 2014年第6期5卷 420-444页

作者： xiaofei yang Dongmei Hou Wei Jiang Chen Zhang Key Laboratory of Cognitive Science Laboratory of Membrane Ion Channels and Medicine College of Biomedical Engineering South-Central University for Nationalities Wuhan 430074 China State Key Laboratory of Biomembrane and Membrane Biotechnology College of Life Sciences Peking University Beijing 100871 China PKU-IDG/McGovern Institute for Brain Research Peking University Beijing 100871 China

Chemical synapses are asymmetric intercellular junc. tions through which neurons send nerve impulses to communicate with other neurons or excitable cells. The appropriate formation of synapses, both spatially and temporally, is essential for brain function and depends on the intercellular protein-protein interactions of cell adhesion molecules （CAMs） at synaptic clefts. The CAM proteins link pre- and post-synaptic sites, and play essential roles in promoting synapse formation and maturation, maintaining synapse number and type, accumulating neurotransmitter receptors and ion chan- nels, controlling neuronal differentiation, and even regulating synaptic plasticity directly. Alteration of the interactions of CAMs leads to structural and functional impairments, which results in many neurological disorders, such as autism, Alzheimer＇s disease and schizophrenia. Therefore, it is crucial to understand the functions of CAMs during development and in the mature neural system, as well as in the pathogenesis of some neurological disorders. Here, we review the function of the major classes of CAMs, and how dysfunction of CAMs relates to several neurological disorders.

关键词： synapse formation cell-cell adhesion,synaptic plasticity neurological disorders protein-protein interaction cell adhesion molecules

The effect of multilayer structure on magnetic properties of FePt thin films

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 22-26页

作者： Kaifeng DONG xiaofei yang Junbing YAN Weiming CHENG Xiaomin CHENG Department of Electronic Science ＆： Technology Huazhong University of Science ＆ TechnologyWuhan 430074 China

The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.

关键词： L10-FePt thin films Multilayer structure Coercivity Ordering temperature

Pd nanoparticles embedded in N-Enriched MOF-Derived architectures for efficient oxygen reduction reaction in alkaline media

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Green Energy & Environment 2023年第4期8卷 1205-1215页

作者： Daqiang Yan Lin Zhang Lei Shen Runyu Hu Weiping Xiao xiaofei yang College of Science Institute of Materials Physics and ChemistryNanjing Forestry UniversityNanjing210037China

Developing high efficient Pd-based electrocatalysts for oxygen reduction reaction(ORR) is still challenging for alkaline membrane fuel cell,since the strong oxygen adsorption energy and easy agglomerative intrinsic properties. In order to simultaneously solve these problems, Pd/Co_(3)O_(4)–N–C multidimensional materials with porous structures is designed as the ORR catalysts. In details, the ZIF-67 with polyhedral structure was firstly synthesized and then annealed at high-temperature to prepare the N-doped Co_(3)O_(4)carbon-based material, which was used to homogeneously confine Pd nanoparticles and obtained the Pd/Co_(3)O_(4)–N–C series catalysts. The formation of Co–N and C–N bond could provide efficient active sites for ORR. Simultaneously, the strong electronic interaction in the interface between the Pd and N-doped Co_(3)O_(4)could disperse and avoid the agglomeration of Pd nanoparticles and ensure the exposure of active sites, which is crucial to lower the energy barrier toward ORR and substantially enhance the ORR kinetics. Hence, the Pd/Co_(3)O_(4)–N–C nanocompounds exhibited excellent ORR catalytic performance, ideal Pd mass activity, and durability in 0.1 mol L-1KOH solution compared with Co_(3)O_(4)–N–C and Pd/C. The scalable synthesis method, relatively low cost, and excellent electrochemical ORR performance indicated that the obtained Pd/Co_(3)O_(4)–N–C electrocatalyst had the potential for application on fuel cells.

关键词： Oxygen reduction reaction Electrocatalysis Pd/Co_(3)O_(4)–N–C Carbon-based materials Co–N and C–N bond

Ni-P-SBR composite-electroless-plating enables Si anode with high conductivity and elasticity for high performance Li-ion batteries application

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Journal of Energy Chemistry 2023年第1期76卷 59-66,I0003页

作者： Yuxiao Wang Jian Gou Hongzhang Zhang xiaofei yang Huamin Zhang Xianfeng Li Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100039China

Silica-based anode is widely employed for high energy density Li-ion batteries owing to their high theoretical specific capacity(4200 m A h g-1).However,it is always accompanied by a huge volume expansion(300%)and shrinks during the lithiation/delithiation process,further leading to low cycle *** to mitigate the adverse effects caused by volume expansion such as robust binder matrix,Coreshell structure,etc.,inevitably affect the electronic conductivity within the ***,a high conductivity and elasticity Si anode(Ni-P-SBR(styrene-butadiene rubber)@Si)was designed and fabricated via the Ni-P-SBR composite-electroless-plating *** this design,the Si particles are surrounded by SBR polymer and Ni particles,where the SBR can adapt to the volume change and Ni particles can provide the electrode with high electronic ***,the Ni-P-SBR@Si delivers a high initial capacity of 3470 m A h g-1and presents capacity retention of 49.4%within 200 cycles at 600 m A ***,a high capacity of 1153 m A h g-1can be achieved at 2000 m A g-1and can be cycled stably under bending *** strategy provides feasible ideas to solve the key issues that limit the practical application of Si anodes.

关键词： Silicon anode Volume expansion Composite-electroless-plating High elasticity High electronic conductivity

Controllable synthesis of grain boundary-enriched Pt nanoworms decorated on graphitic carbon nanosheets for ultrahigh methanol oxidation catalytic activity

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Journal of Energy Chemistry 2021年第6期30卷 601-609,I0014页

作者： Huajie Huang Yujie Wei Ying yang Minmin Yan Haiyan He Quanguo Jiang xiaofei yang Jixin Zhu College of Mechanics and Materials Hohai UniversityNanjing 210098JiangsuChina Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of ScienceNanjing Forestry UniversityNanjing 210037JiangsuChina Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816JiangsuChina

Although one-dimensional Pt nanocrystals have long been regarded as ideal electrode catalysts for fuel cells,the synthetic techniques commonly involve the use of various complicated templates or surfactants,which have largely hampered their large-scale industrial ***,we present a convenient and cost-effective approach to the stereoassembly of quasi-one-dimensional grain boundary-enriched Pt nanoworms on nitrogen-doped low-defect graphitic carbon nanosheets(Pt NWs/NL-CNS).Benefiting from its numerous catalytically active grain boundaries as well as optimized electronic structure,the as-derived Pt NWs/NL-CNS catalyst possesses exceptionally good electrocatalytic properties for methanol oxidation,including an ultrahigh mass activity of 1949.5 mA mg^(-1), reliable long-term durability,and strong poison tolerance,affording one of the most active Pt-based electrocatalysts for methanol oxidation *** functional theory calculation further reveals that the formation of worm-shape Pt morphology is attributed to the modified electronic structure as well as controllable defect density of the carbon matrix,which could also weaken the adsorption ability of Pt towards CO molecule and meanwhile synergistically promotes the catalytic reaction kinetics.

关键词： Platinum nanoworm Nitrogen doping Low defect Carbon nanosheet Methanol oxidation