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H∞ control of a class of nonlinear Hamiltonian descriptor systems

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science china(Information sciences) 2010年第11期53卷 2195-2204页

作者： SUN LiYing1,2 & WANG YuZhen1 1school of Control science and Engineering, Shandong university, jinan 250061, china 2school of science, university of jinan, jinan 2.002., china 1. school of Control science and Engineering Shandong University Jinan 250061 China2. School of Science University of Jinan Jinan 250022 China

This paper studies the stabilization and H∞ control of a class of nonlinear Hamiltonian descriptor systems. Firstly, based on the structural characteristic of the nonlinear Hamiltonian descriptor system, an equivalent nonlinear dissipative Hamiltonian differential-algebraic system is obtained by using restricted system equivalent theory. With the dissipative form, the stabilization problem is then discussed for the nonlinear Hamiltonian descriptor systems, and an H∞ controller is designed. Finally, simulations on a nonlinear circuit system are given.

关键词： nonlinear Hamiltonian descriptor systems stabilization H∞ control

Single-cell transcriptomics reveals the ameliorative effect of rosmarinic acid on diabetic nephropathy-induced kidney injury by modulating oxidative stress and inflammation

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Acta Pharmaceutica Sinica B 2024年第4期14卷 1661-1676页

作者： Junhui Chen Qian Zhang jinan Guo Di Gu Jing Liu Piao Luo Yunmeng Bai Jiayun Chen Xinzhou Zhang Sheng Nie Chunbo Chen Yulin Feng Jigang Wang National Pharmaceutical Engineering Center for Solid Preparation of Chinese Herbal Medicine Jiangxi University of Chinese MedicineNanchang 330006China Department of Pulmonary and Critical Care Medicine Shenzhen Institute of Respiratory Diseasesand Shenzhen Clinical Research Centre for GeriatricsShenzhen People's HospitalFirst Affiliated Hospital of Southern University of Science and TechnologySecond Clinical Medical College of Jinan UniversityShenzhen 518020China school of Traditional Chinese Medicine and school of Pharmaceutical sciences Southern Medical UniversityGuangzhou 510515China Department of Urology and Shenzhen Clinical Research Centre for GeriatricsShenzhen People's Hospitalthe First Affiliated HospitalSouthern University of Science and TechnologyShenzhen 518020China Department of Urology the First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510230China Department of Nephrology Shenzhen Key Laboratory of Kidney Diseasesand Shenzhen Clinical Research Centre for GeriatricsShenzhen People's Hospitalthe First Affiliated HospitalSouthern University of Science and TechnologyShenzhen 518020China Department of Nephrology Nanfang Hospitalthe First Affiliated Hospital of Southern Medical UniversityGuangzhou 510515China Department of Critical Care Medicine Shenzhen People's Hospital(the Second Clinical Medical CollegeJinan Universitythe First Affiliated HospitalSouthern University of Science and Technology)Shenzhen 518020China State Key Laboratory for Quality Esurance and Sustainable Use of Dao-di Herbs Artemisinin Research Centerand Institute of Chinese Materia MedicaChina Academy of Chinese Medical SciencesBeijing 100700China Department of Oncology the Affiliated Hospital of Southwest Medical UniversityLuzhou 646000China

Diabetic nephropathy(DN)is a severe complication of diabetes,characterized by changes in kidney structure and *** natural product rosmarinic acid(RA)has demonstrated therapeutic effects,including anti-inflammation and anti-oxidative-stress,in renal damage or *** this study,we characterized the heterogeneity of the cellular response in kidneys to DN-induced injury and RA treatment at single cell *** results demonstrated that RA significantly alleviated renal tubular epithelial injury,particularly in the proximal tubular S1 segment and on glomerular epithelial cells known as podocytes,while attenuating the inflammatory response of macrophages,oxidative stress,and cytotox-icity of natural killer *** findings provide a comprehensive understanding of the mechanisms by which RA alleviates kidney damage,oxidative stress,and inflammation,offering valuable guidance for the clinical application of RA in the treatment of DN.

关键词： Rosmarinic acid Diabetic nephropathy scRNA sequencing Injury Oxidative stress Infiammation Proteomics

Reverse extraction of early-age hydration kinetic equation from observed data of Portland cement

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science china(Technological sciences) 2010年第6期53卷 1540-1553页

作者： WANG Lin1,YANG Bo2,ZHAO XiuYang1,2,CHEN YueHui2 & CHANG Jun3 1 school of Computer science and Technology,Shandong university,jinan 250101,china 2 Provincial Key Laboratory for Network-based Intelligent Computing,university of jinan,jinan 2.002.,china 3 school of Material science and Engineering,university of jinan,jinan 2.002.,china 1. school of Computer science and Technology Shandong University Jinan 250101 China2. Provincial Key Laboratory for Network-based Intelligent Computing University of Jinan Jinan 250022 China3. School of Material Science and Engineering University of Jinan Jinan 250022 China

The early-age hydration of Portland cement paste has an important impact on the formation of microstructure and development of ***,manual derivation of hydration kinetic equation is very difficult because there are multi-phased,multi-sized and interrelated complex chemical and physical reactions during cement *** this paper,early-age hydration kinetic equation is reversely extracted automatically from the observed time series of hydration degree of Portland cement using evolutionary computation method that combines gene expression programming and particle swarm optimization *** order to reduce the computing time,GPUs are used for acceleration in *** have shown that according to the extracted kinetic equation,simulation curve of early-age hydration is in good accordance with the observed experimental ***,this equation still has a good generalization ability even changing chemical composition,particle size and curing conditions.

关键词： Portland cement hydration kinetic equation reverse extraction gene expression programming particle swarm optimization

LEAST-SQUARES MIXED FINITE ELEMENT METHODS FOR NONLINEAR PARABOLIC PROBLEMS

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Journal of Computational Mathematics 2002年第2期20卷 153-164页

作者： Dan-ping Yang (school of Mathematics and System science, Shandong university, jinan 250100, china) school of Mathematics and System science Shandong University Jinan 250100

Focuses on the formulation of a number of least-squares mixed finite element schemes to solve the initial boundary value problem of a nonlinear parabolic partial differential equation. Convergence analysis; Informatio... 详细信息

关键词： least-squares algorithm mixed finite element nonlinear parabolic problems convergence analysis

Adaptive bidirectional diffusion for image restoration

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science china(Information sciences) 2010年第12期53卷 2452-2460页

作者： FU ShuJun 1,2 & ZHANG CaiMing 1 1 school of Computer science and Technology, Shandong university, jinan 250101, china 2.school of Mathematics, Shandong university, jinan 250100, china 1. school of Computer science and Technology Shandong University Jinan 250101 China2. School of Mathematics Shandong University Jinan 250100 China

A large number of applications in image processing and computer vision depend on image quality. In this paper, combining the forward diffusion with the backward diffusion by different weights, we present an adaptive bidirectional diffusion method for image denoising and deblurring simultaneously. Further, we introduce a gradient factor into the data fidelity term, which forms a spatially varying constraint and allows a better restoration of image edges and fine details. In order to obtain a stable solution, we develop a numerically stable scheme and give its theoretical analysis. Finally, we show advantages of this method in deblurring edges, denoising and restoring fine details of image compared with other related methods in experiments.

关键词： image restoration bidirectional diffusion inverse diffusion anisotropic diffusion stabilizing scheme spatially varying constraint

An investigation of hadronization mechanism at a Z^0 factory

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science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 1998-2004页

作者： JIN Yi 1,SI ZongGuo 2,XIE QuBing 2 & YAO Tao 2 1 Department of Physics,university of jinan,jinan 2.002.,china 2.school of Physics,Shandong university,jinan 250100,china 1. Department of Physics University of Jinan Jinan 250022 China2. School of Physics Shandong University Jinan 250100 China

We briefly review the hadronization pictures adopted in the LUND String Fragmentation Model (LSFM),Webber Cluster Fragmentation Model (WCFM) and Quark Combination Model (QCM),*** of hadron multiplicity,baryon to meson ratios and baryon-antibaryon flavor correlations,especially those related to heavy hadrons at a Z 0 factory obtained by LSFM and QCM,are reported.

关键词： Z0 factory hadronization model baryon to meson ratio B correlation

Stability for a class of nonlinear time-delay systems via Hamiltonian functional method

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science china(Information sciences) 2012年第5期55卷 1218-1228页

作者： YANG RenMing 1,2 & WANG YuZhen 1 1 school of Control science and Engineering,Shandong university,jinan 250061,china 2 Shandong Jiaotong university,jinan 2.002.,china 1. school of Control science and Engineering Shandong University Jinan 250061 China2. Shandong Jiaotong University Jinan 250023 China

This paper investigates the stability of a class of nonlinear time-delay systems via Hamiltonian functional method,and proposes a number of new results on generalized Hamiltonian realization (GHR) and stability analysis for this class of ***,the concept of GHR of general nonlinear time-delay systems is proposed,and several new GHR methods are ***,based on the new GHR methods obtained,the stability of time-delay systems is investigated,and several delay-dependent sufficient conditions in term of matrix inequalities are derived for the stability analysis by constructing suitable Lyapunov-Krasovskii (L-K) ***,an illustrative example shows that the results obtained in this paper have less conservatism,and work very well in the stability analysis of some nonlinear time-delay Hamiltonian systems.

关键词： nonlinear time-delay systems stability Hamiltonian functional method generalized Hamiltonian realization

Mechanical model of vulnerable atherosclerotic plaque rupture

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science china(Physics,Mechanics & Astronomy) 2004年第4期47卷 452-462页

作者： SU Haijun1, ZHANG Mei2 & ZHANG Yun2 1. school of Mathematics and System science, Shandong university, jinan 250100, china 2. Qilu Hospital, Shandong university, jinan 250012, china 1. school of Mathematics and System science Shandong University 250100 Jinan China 2. Qilu Hospital Shandong University 250012 Jinan China

Rupture of atherosclerotic plaque is the main trigger of acute cardiovascular events, but the mechanism of plaque rupture is still unknown. We have constructed a model describing the motion of the fibrous cap of the plaque using the theory of elastic mechanics and studied the stability of the plaque theoretically. It has shown that plaque rupture is the result of a dynamic interplay between factors intrinsic to the plaque itself and extrinsic factors. We have proposed a new mechanism of plaque rupture, given a new explanation about the nonlinear dynamic progress of atherosclerosis and suggested a method to identify the vulnerable plaques to manage atherosclerosis.

关键词： fibrous cap, parametric resonance, stability, mechanism, identification.

Preparation of MgTiO_3 Ceramics by High Energy Ball Milling

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Journal of Wuhan university of Technology(Materials science) 2006年第3期21卷 116-119页

作者：陶珍东 school of Materials science and Engineering Jinan University Jinan 250022ChinaSchool of Materials Science and Engineering Shandong University Jinan 250061China

MgTiO3 precursor was mechanochemically synthesized by high-energy ball milling of MgO and TiO2 . The sinteting characteristic of the resulted MgTiO3 precursor was investigated. The experirneatal resalts indicate that particles of both MgO and TiO2 powders become smaller rapidly, and then the costalline structures of MgO and TiO2 change significantly. MgTiO3 was observed by XRD after 30 hours of ball milling. Strong diffraction peaks of MgTiO3 were observed after 50 hours of ball milling. HRTEM observation proves that dense MgTiO3 ceramics with a compact crystalline structure can be sintered from rnechanochemically activated MgTiO3 precursor, the volume density of the resulting ceramie is as high aa 95% of the theoretical density, the porosity and average pore diameter of the ceramic are measured as 4.95% and 50 nm respectively, and the transverse strength exceeded 500 MPa.

关键词： high energy ball milling MgTiO3 ceramics sintering feature