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Further decomposition for singular systems and its properties on geometric subspace

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控制理论与应用（英文版） 2010年第3期8卷 293-300页

作者： jianxiong YANG, Maoqing li (Department of Automation, Xiamen University, Xiamen Fujian 361005, China) Department of Automation Xiamen University Xiamen Fujian China

This paper focuses on the relationship between the geometric subspaces and the structural decomposition of continuous-time singular systems. The original structural decomposition is not capable of revealing explicitly the invariant geometric subspaces for singular systems. As such, a further decomposition is necessary and is thus investigated in this paper. Under a new decomposition proposed, the supremal output-nulling （A, E, ImB）-invariant subspace of singular systems can be clearly expressed in an explicit form, and some of its applications are also addressed.

关键词： Singular systems Structural demonstration Geometric subspaces

Backstepping Sliding Mode Control for Continuous Casting Mold Vibration Displacement System Driven by Servo Motor 36

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Backstepping Sliding Mode Control for Continuous Casting Mol...

Controllable optical activity with non-chiral plasmonic metasurfaces

第36届中国控制会议

作者： li jianxiong GUO Cui FANG Yiming ZHANG Qiyu Key Lab of Industrial Computer Control Engineering of Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

ISBN: (纸本)9781538629185

Aiming at the time-varying load torque disturbance in the vibration displacement system of continuous casting mold driven by servo motor,an extended state observer(ESO) based backsteppmg sliding mode control method is ***,a mapping function is established to deal with the non-uniqueness of the nonlinear inverse relationship from eccentric shaft angle to mold ***,an ESO is constructed to estimate the time-varying load torque,and the estimate of load torque is employed to compensate the disturbance in *** a backsteppmg sliding mode controller is then developed for the vibration displacement system of continuous casting mold,which can guarantee the asymptotical stability and the robust stability of the resulting closed-loop ***,simulation results are given to show the effectiveness of the proposed method.

关键词： servo motor drive system vibration displacement system extended state observer backstepping sliding mode control

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light(Science & Applications) 2016年第1期5卷 646-652页

作者： Ping Yu jianxiong li Chengchun Tang Hua Cheng Zhaocheng liu Zhancheng li Zhe liu Changzhi Gu Junjie li Shuqi Chen Jianguo Tian The MOE Key Laboratory of Weak light Nonlinear Photonics School of PhysicsTeda Applied Physics Instituteand the 2011 Project Collaborative Innovation Center for Biological TherapyNankai UniversityTianjin 300071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Optical activity is the rotation of the plane of linearly polarized light along the propagation direction as the light travels through optically active *** existing methods,the strength of the optical activity is determined by the chirality of the materials,which is difficult to control *** we numerically and experimentally investigated an alternative approach to realize and control the optical activity with non-chiral plasmonic *** judicious design of the structural units of the metasurfaces,the right and left circular polarization components of the linearly polarized light have different phase retardations after transmitting through the metasurfaces,leading to large optical ***,the strength of the optical activity can be easily and accurately tuned by directly adjusting the phase *** proposed approach based on non-chiral plasmonic metasurfaces exhibits large optical activity with a high controllable degree of freedom,which may provide more possibilities for applications in photonics.

关键词： metasurfaces optical activity surface plasmon polaritons

Robust and conductive hydrogel based on mussel adhesive chemistry for remote monitoring of body signals

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Friction 2022年第1期10卷 80-93页

作者： Weijun li Hao liU Yuanyuan MI Miaoran ZHANG Jinmiao SHI Ming ZHAO Melvin A.RAMOS Travis Shihao HU jianxiong li Meng XU Quan XU State Key Laboratory of Heavy Oil Processing.Beijing Key Laboratory of Biogas Upgrading Utilization Harvard SEAS-C UPB Joint L aboratory on Petroleum ScienceChina University of PetroleumBeijing 102249China Department of Mechanical Engineering.California State University Los AngelesCA 90032USA Department of Orthopedics General Hospital of Chinese People's liberat ion Army Beijing 100853China

There is a high demand for hydrogels with multifunctional performance(a combination of adhesive,mechanical,and electrical properties)in biological,tissue engineering,robotics,and smart device ***,a majority of existing hydrogels are relatively rigid and brittle,with limited stretchability;this hinders their application in the emerging field of flexible *** this study,cheap and abundant potato residues were used with polyacrylamide(PAM)to fabricate a multifunctional hydrogel,and chitosan was used for the design of a three-dimentional(3D)network-structured *** as-prepared hydrogels exhibited excellent stretchability,with an extension exceeding 900%and a recovery degree of over 99%.Due to the combination of physical and chemical cross-linking properties and the introduction of dopamine,the designed hydrogel exhibits a remarkable self-healing ability(80%mechanical recovery in 2 h),high tensile strength(0.75 MPa),and ultra-stretchability(900%).The resultant products offer superior properties compared to those of previously reported tough and self-healing hydrogels for wound *** and potato residues were used as scaffold materials for the hydrogels with excellent mechanical *** addition,in vitro experiments show that these hydrogels feature excellent antibacterial properties,effectively hindering the reproduction of ***,the ternary hydrogel can act as a strain sensor with high sensitivity and a gauge factor of *** proposed strategy is expected to serve as a reference for the development of green and recyclable conductive polymers to fabricate *** proposed hydrogel can also act as a suitable strain sensor for bio-friendly devices such as smart wearable electronic devices and/or for health monitoring.

关键词： properties hydrogel conductive

Correlative investigation of copper/low-density polyethylene nanocomposite on the endometrial angiogenesis in rats

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Frontiers of Medicine 2007年第4期1卷 401-404页

作者： li jianxiong liU Zilong li Shuang XIE Changsheng DUAN Yonggang YU Jing ZHU Changhong Family Planning Research Institute Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Cancer Biology Research Center Department of Obstetrics and GynecologyTongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

The purpose of this study was to investigate the effects of copper/low-density polyethylene nanocomposite(nano-Cu/LDPE)on the endometrial angiogenesis in rats,and 100 sexual mature female SD rats were randomly divided into five groups:sham-operation groups(SO group,n=20),bulk copper groups(Cu group,n=20),LDPE groups(n=20),nano-Cu/LDPE groups I(n=20)and II(n=20).The levels of angiopoietin-2(Ang-2),its receptor(Tie-2)and CD34 of the rats’endometria in each group were examined by using the S-P method of the immunohistochemistry 30 and 180 days after insertion,*** with those in the SO group,the expression of Ang-2 and Tie-2 in all the experimental groups was obviously increased 30 days after insertion,and these parameters in nano-Cu/LDPE groups,except for Ang-2 level in nano-Cu/LDPE group II,were significantly lower in comparison with those in Cu group(P0.05).Com-pared with those in the SO group,the significant increases in microvessel density(MVD)were observed on the 30th and the 180th day after the insertion of the bulk copper(P0.05).The results show that Nano-Cu/LDPE have slighter influence on the endometrial angiogenesis than bulk copper.

关键词： copper polyethylene nanocomposites intra-uterine devices,copper angiogenesis angiopoietin-2 receptor,Tie-2 microvessel density

From Nairobi to Beijing

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Women of China 1996年第2期 6-9页

作者： li jianxiong

TEN years have separated the 1985 UN Third World Conference on Women held in Nairobi, from the UN Fourth World Conference on Women (FWCW), held in Beijing, last September. During the past ten years, the world has undergone profound changes in politics, economy and society, which have undoubtedly exerted a great influence on women. Reviewing these ten years it is clear that each government, non-governmental organization, and women themselves have made many achievements in implementing

关键词： UN World From Nairobi to Beijing

Metasurface-enabled polarization-independent LCoS spatial light modulator for 4K resolution and beyond

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light(Science & Applications) 2023年第7期12卷 1391-1400页

作者： Zhaoxiang Zhu Yuanhui Wen Jiagi li Yujie Chen Zenghui Peng jianxiong liz Lei Zhu Yunfei Wu lidan Zhou lin liu liangjia Zong Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Huawei Technologies Co. Ltd.BantianLonggang DistrictShenzhen 518129China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

With the distinct advantages of high resolution,small pixel size,and multi-level pure phase modulation,liquid crystal on silicon(LCoS)devices afford precise and reconfigurable spatial light modulation that enables versatile applications ranging from micro-displays to optical ***,LCoS devices suffer from a long-standing problem of polarization-dependent response in that they only perform phase modulation on one linear polarization of light,and polarization-independent phase modulation-essential for most applications-have had to use complicated polarization-diversity *** propose and demonstrate,for the first time,an LCos device that directly achieves high-performance polarization-independent phase modulation at telecommunication wavelengths with 4K resolution and beyond by embedding a polarization-rotating metasurface between the LCoS backplane and the liquid crystal phase-modulating *** verify the device with a number of typical polarization-independent application functions including beam steering,holographical display,and in a key optical switching element-wavelength selective switch(WsS),demonstrating the significant benefits in terms of both configuration simplification and performance improvement.

关键词： polarization beyond modulator

Colonization of Rice Roots by a Green Fluorescent Protein-Tagged Isolate of Ustilaginoidea virens

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American Journal of Plant Sciences 2015年第14期6卷 2272-2279页

作者： Mebeaselassie Andargie Luoye li Aiqing Feng jianxiong li Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany South China Botanical Garden Chinese Academy of Sciences Guangzhou China Plant Protection Institute Guangdong Academy of Agricultural Sciences Guangzhou China

The fungus U. virens is the causal agent of rice false smut disease. The green fluorescent protein (GFP) was used to mark this fungus in order to visualize and analyze the colonization and infection processes in vivo. Using epifluorescence microscopy colonization and infection on rice roots were visualized in vivo. After inoculation for 2 to 15 d, it was observed that the conidia and their germ-tubes had penetrated into epidermis of young roots. The hyphae were found inside the root xylem 18 d after inoculation. Generally, the transformed fungus colonized the rhizosphere, the cortex as well as the vascular tissues with symptoms of root necrosis observed. The results of this work show that U. virens colonize not only rice panicles but also the roots.

关键词： Endophytes Plant-Fungal Interactions Rhizosphere Root Colonization Ustilaginoidea virens

What Does the Rise in RMB Interest Rates Signify?

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China Today 2005年第1期54卷 24-25页

作者： SUI jianxiong & staff reporter li WUZHOU

According to Jia Moyue, the rise in RMB interest rates will be felt more within the international than the domestic economy.

关键词：中国人民币汇率人民升值世界经济