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High-Order Fully Actuated System Models for Strict-Feedback Systems With Increasing Dimensions

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IEEE/CAA Journal of Automatica Sinica 2024年第12期11卷 2451-2462页

作者： Xiang xu guang-Ren Duan Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology the School of System Design and Intelligent Manufacturing Southern University of Science and Technology

This paper mainly addresses control problems of strict-feedback systems(SFSs) with increasing dimensions. Compared with the commonly-considered SFSs where the subsystems have the same dimension, we aim to handle more complex cases,i.e., the subsystems in the considered SFSs are assumed to have increasing dimensions. By transforming the systems into highorder fully-actuated system(HOFAS) models, the stabilizing controllers can be directly given. Besides first-order SFSs, secondorder and high-order SFSs are also considered.

关键词： Increasing dimensions high-order fully-actuated system nonlinear systems strict-feedback systems

Super-high bed sintering for iron ores: inhomogeneous phenomena and its mechanism during mineralizing

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Journal of Iron and Steel Research International 2024年第8期31卷 1850-1860页

作者： Hui-bo Liu Liang-ping xu Xi-duan Yang Zhong-lin Dong Qiang Zhong guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina

The inhomogeneous sinter properties in super-high bed sintering have been reported in our previous *** inves-tigate the reasons for the inhomogeneous phenomena,detailed sampling and analysis of mixed material bed and sintered bed in super-high bed sintering plant were *** results indicated that the higher porosity and thinner dendrite of silico-ferrite of calcium and aluminum in the upper layer as well as dense structure and higher secondary hematite content in the lower layer led to the heterogeneities of mechanical strength and reduction properties exceeding 20%and 10%,*** the bed top downward,the basicity of mixed material decreased from 2.13 to 1.68 because the average particle size increased from 2.65 to 4.56 *** and fuels gathered in finer particles(-3 mm)of mixed material,and the-3 mm particles of mixed material generated more liquid phase than+3 mm *** heat input of super-high sintering bed was inhomogeneous due to the heat accumulation effect and unreasonable fuel *** inhomo-geneous sintering heat condition in sintering bed resulted in the different quantities and properties of liquid *** inhomogeneous quantities and properties of liquid phase that were influenced by inhomogeneous distribution of chemical composition,particle size,and heat input led to inhomogeneous mineralizing *** mineralizing condition is the key for homogeneous super-high bed sintering.

关键词： Iron ore Super-high bed sintering Mineralization Material segregation Heat accumulation

Novel quantum phenomena induced by strong magnetic fields in heavy-ion collisions

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Nuclear Science and Techniques 2017年第2期28卷 70-98页

作者： Koichi Hattori xu-guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan University Shanghai 200433 China RIKEN-BNL Research Center Brookhaven National Laboratory Upton NY 11973-5000 USA Department of Physics Brookhaven National LaboratoryUpton NY 11973-5000 USA

The relativistic heavy-ion collisions create both hot quark–gluon matter and strong magnetic fields, and provide an arena to study the interplay between quantum chromodynamics and quantum electrodynamics. In recent years, it has been shown that such an interplay can generate a number of interesting quantum phenomena in hadronic and quark–gluon matter. In this short review, we first discuss some properties of the magnetic fields in heavy-ion collisions and then give an overview of the magnetic fieldinduced novel quantum effects. In particular, we focus on the magnetic effect on the heavy flavor mesons, the heavyquark transports, and the phenomena closely related to chiral anomaly.

关键词： Relativistic heavy-ion collisions Strong magnetic fields Anomalous transports Quarkonium Heavy quark diffusion dynamics

Preparation of Mo_2C nanoparticles dispersion-strengthened copper-based composite by EB-PVD

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Rare Metals 2014年第5期33卷 568-572页

作者： Xiao Li guang-ping Song Fan-Yu Bu Bin xu Bai-Yang Lou Zhan Lin College of Materials Science and Engineering Zhejiang University of Technology Center for Composite Materials and Structures Harbin Institute of Technology

In this research, a nano-Mo2 C particle dispersion-strengthened copper alloy was prepared by a novel method, i.e., electron beam physical vapor deposition（EBPVD） which has advantages of simple technical process and low cost compared with the conventional mechanical alloying method. And the microstructure and properties of the material were investigated. The results show that the copper matrix is composed of columnar crystals with the average width of 7 lm, and the size of Mo2 C dispersoid is1–7 nm. The ultimate tensile strength of the material is486 MPa, and the electrical conductivity is 82 % IACS. As the temperature increases from 293 to 573 K, the material becomes more brittle.

关键词： Electron beam physical vapor deposition Dispersion-strengthened copper ODS In-situ

Microstructure and magnetic properties of Nd-Fe-B sintered magnets with P addition

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Rare Metals 2019年第8期38卷 770-775页

作者： Fang Yang guang-Le Dong Yan-Li Sui Si-Yang Ye ping Li Cun-guang Chen xue-xu Gao Zhi-Meng Guo Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083 China Tianjian Sanhuan Lucky New Materials Inc. Tianjin 300457China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083 China

In this paper,the effects of P doping on magnetic properties and microstructure were studied in Nd-Fe-B sintered *** P doping,the grain size gets refined and the distribution of the main phase is optimized due to the reduction of the liquidus *** liquidus temperature for the 0.05 wt% P-doped magnets is 1022 K,while that for the P-free magnets is 1038 *** P content increases,the liquidus temperature significantly *** and continuous grain boundary phases are formed in the P-containing magnets with smaller grain *** optimized microstructure with average grain size of 8.43 μm is obtained in the 0.05 wt% P-doped magnets,which is approximately 0.69 μm smaller than that of P-free sintered magnets (9.12 μm).Though P is usually thought to be an impurity element,it might be beneficial in Nd-Fe-B sintered magnets with proper *** coercivity of the 0.05 wt% P-doped magnets could be increased to 1283 kA·m-1,with slight changes of the remanence and the maximum magnetic energy ***4 phases in the grain boundary are of hexagonal structure,while those at the triple junctions have monoclinic *** sintering is achieved by doping proper P element in the Nd-Fe-B sintered magnets.

关键词： Nd-Fe-B sintered magnets P Microstructure Magnetic properties Activated sintering

Spin polarization formula for Dirac fermions at local equilibrium

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 121-128页

作者： Yu-Chen Liu xu-guang Huang Physics Department and Center for Field Theory and Particle Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China

We derive a Cooper-Frye type spin polarization formula for Dirac fermions at local thermal equilibrium described by a grand canonical ensemble specified by temperature, fluid velocity, chemical potential, and spin potential. We discuss the physical meaning of different contributions to spin polarization and compare them with previous work. The present formula provides machinery to convert the spin potential computed in, e.g., relativistic spin hydrodynamics to the spin polarization observable in,e.g., heavy-ion collisions.

关键词： spin polarization local equilibrium spin kinetic theory

Design and experimental confirmation of a novel switched hyperchaotic system

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The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 122-128页

作者： ZHANG Ya-jun WANG Cui-ping WANG guang-yi xu Ning WANG Zhong-lin School of Electronics Information Hangzhou Dianzi University Hangzhou 310018 China Department of Physics and Electronics Binzhou University Binzhou 256600 China

To generate complex pseudo-noise （PN） sequences for chaos-based communications, this article presents a novel switched hyperchaotic model, which is constructed based on a modified Chen system by introducing a dynamical controller. The system consists of two different hyperchaotic subsystems and can change its behavior randomly via a switching function. Basic dynamical behaviors of the hyperchaotic system are further investigated. Furthermore, the switched system is confirmed by its positive Lyapunov exponents and laboratory measurements by an electronic circuit.

关键词： chaos-based communication hyperchaos circuit realization

Dynamics and Thermodynamics of Porous HMX-like Material Under Shock

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Communications in Theoretical Physics 2009年第11期52卷 901-908页

作者： xu Ai-Guo ZHANG guang-Cai ZHANG ping PAN Xiao-Fei ZHU Jian-Shi National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P.O.Box 8009-26 Beijing 100088 China

Strong shock may induce complex processes in porous materials. We use the newly developed materialpoint-method to simulate such processes in an HMX-like material. To pick out relevant information, morphological characterization is used to treat with the temperature map. Via the Minkowski funetional analysis the dynamics and thermodynamics of the shock wave reaction on porous HMX-like material are studied. The geometrical and topological properties of the ＂hot-spots＂ are revealed. Numerical results indicate that, shocks in porous materials are not simple jump states as classically viewed, but rather are a complex sequence of compressions and rarefactions. They cover a broad spectrum of states. We can use coarse-grained description to the wave series. A threshold value of temperature presents a Turing pattern dynamical procedure. A higher porosity is generally preferred when the energetic material needs a higher temperature for initiation. The technique of data analysis can be used to other physical quantities, for example, density, particle velocity, some specific stress, etc. From a series of studies along the line, one may get a large quantity of information for desiring the fabrication of material and choosing shock strength according to what needed is scattered or connected ＂hot-spots＂. PACS numbers： ***, 05 Key words： porous material 70.-a, 05.40.-a, *** shock wave, Minkowski functionals

关键词： porous material shock wave Minkowski functionals

Mechanisms and significance of lipoprotein(a) in hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2009年第1期8卷 25-28页

作者： Jiang, Jing-Ting Wu, Chang-ping xu, Ning Zhang, xue-guang Suzhou Univ Inst Biotechnol Key Lab Clin Immunol Jiangsu Prov Suzhou 215007 Peoples R China Suzhou Univ Affiliated Hosp 3 Dept Tumor Biol Treatment Changzhou 213003 Peoples R China Lund Univ Sect Clin Chem & Pharmacol S-22185 Lund Sweden

BACKGROUND: The liver plays a key role in the metabolism of plasma apolipoproteins, endogenous lipids and lipoproteins. Hepatocellular carcinoma is one of the most common fatal malignant tumors in China and in other Southeast Asian countries. It has been demonstrated that plasma lipid profiles are changed in liver cancer. DATA SOURCES: A MEDLINE database search was performed to identify relevant articles using the keywords 'hepatocellular carcinoma' and 'lipoprotein(a)'. The search was conducted and research articles were reviewed from 1960 to 2008. RESULTS: Production and homeostasis of lipids, apolipoproteins and lipoproteins depend on the integrity of hepatocellular functions, which ensures normal lipid and lipoprotein metabolism in vivo. When hepatocellular injury or liver cancer occurs these processes can be impaired. It has been suggested that plasma levels of apolipoprotein(a) (apo(a)) and/or lipoprotein (a) (Lp(a)) may be considered as sensitive markers of hepatic impairment. CONCLUSIONS: Plasma levels of apo(a) and Lp(a) display significant correlations with hepatic status. Most studies demonstrated that the plasma levels of apo(a) and Lp(a) can be considered as an additional clinical index of liver function.

关键词： lipoprotein(a) apolipoprotein(a) metabolism hepatocellular carcinoma