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Jackson's Theorem on Bounded Symmetric Domains

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Acta Mathematica Sinica,English Series 2007年第8期23卷 1391-1404页

作者： Ming zhi WANG guang Bin REN School of Science Huzhou Teachers College Huzhou 313000 P. R. China Department of Mathematics University of Science and Technology of China Hefei 230026 P. R. China

Polynomial approximation is studied on bounded symmetric domain Ω in C^n for holomorphic function spaces X such as Bloch-type spaces, Bergman-type spaces, Hardy spaces, Ω algebra and Lipschitz space. We extend the classical Jackson＇s theorem to several complex variables：Eκ（f,X）≤ω（1/k,f,X）, where Eκ（f,X） is the deviation of the best approximation of f ∈X by polynomials of degree at most k with respect to the X-metric and ω（1/k,f,X） is the corresponding modulus of continuity.

关键词： bounded symmetric domains Bergman spaces polynomial approximation

Use of Dispersion Relations in ππ and KK^- Coupled-Channel System

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Communications in Theoretical Physics 2007年第4X期48卷 685-694页

作者： XIAO zhi-guang ZHENG Han-Qing Department of Physics Peking University Beijing 100871 China

Systematic and careful studies are made on the properties of the IJ =00 7rTr and KK^- coupled-channel system, using newly derived dispersion relations between the phase shifts and poles and cuts. The effects of nearby... 详细信息

关键词： ππ scattering

Isometric Embeddings of Subsets of Boundaries of Teichmüller Spaces of Compact Hyperbolic Riemann Surfaces

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Acta Mathematica Sinica,English Series 2020年第5期36卷 605-619页

作者： guang Ming hu Yi QI College of Science Jinling Institute of TechnologyNanjing 211169P.R.China LMIB and School of Mathematics and Systems Science Beihang UniversityBeijing 100191P.R.China

It is known that every finitely unbranched holomorphic covering π:S→S of a compact Riemann surface S with genus g≥2 induces an isometric embedding Φπ:Teich(S)→Teich(S).By the mutual relations between Strebel rays in Teich(S)and their embeddings in Teich(S),we show that the 1 st-strata space of the augmented Teichmüller space Teich(S)can be embedded in the augmented Teichmüller space Teich(S)***,we show that Φπ induces an isometric embedding from the set Teich(S)B(∞)consisting of Busemann points in the horofunction boundary of Teich(S)into Teich(S)B(∞)with the detour metric.

关键词： Teichmüller space augmented Teichmüller space Strebel ray Busemann points

Onboard real time modeling of aircraft engines with Hammerstein-Wiener representation

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航空动力学报 2014年第10期29卷 2499-2506页

作者： WANG Ji-qiang YE zhi-feng hu Zhong-zhi Jiangsu Province Key Laboratory of Aerospace Power System College of Energy and Power EngineeringNanjing University of Aeronautics and Astronautics

An identification-based approach for aircraft engine modeling using the nonlinear HammersteinWiener representation was ***-Wiener modeling for both limited flight envelope and extended flight envelope was *** shows that the resulting model can be valid over 10%variation of rotational speed of the engine,compared with those linear models that are only valid over 3%—5%change of rotational *** is further demonstrated that the proposed method can be utilized over large envelope up to 20% variation of rotational speed of the *** fundamental idea is to use nonlinear models to extend the feasible/valid region rather than those linear *** may consequently simplify the switching logic in the onboard digital control *** is often overlooked in aircraft engine control community,but has been emphasized in the research.

关键词： aircraft engines engine modeling onboard real time modeling system identification Hammerstein-Wiener representation

Tetraethylenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for the removal Cr(Ⅲ)-ethylenediaminetetraacetic acid in complex solution

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Chinese Journal of Chemical Engineering 2024年第4期68卷 16-26页

作者： zhi hu Jiahong Wang Tongtong Sun School of Environmental Science and Engineering Shaanxi University of Science&TechnologyXi'an 710021China Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials Xi'an 710021China

A novel tetraethylenepentamine(TEPA) functionalized magnetic mesoporous silica adsorbent(FNMs/TEPA) was prepared for the adsorption of Cr(Ⅲ)-ethylenediaminetetraacetic acid(EDTA)from wastewater. The characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon(FNMs), while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties. The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(Ⅲ)-EDTA. FNMs/TEPA exhibited an excellent adsorption property(13.84 mg·g-1) at p H 4.0. Even in the presence of high concentrations of coexisting ions and organic acids, the adsorption performance of FNMs/TEPA was stable. Experimental characterization and DFT demonstrated that the adsorption of Cr(Ⅲ)-EDTA was ascribed to the electrostatic interaction, hydrogen bonding, and complexation between Cr(Ⅲ)-EDTA and amino groups on the adsorbent surface. The analysis of the independent gradient model(IGM) shows that electrostatic interaction is the main mode of action in the adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles. These findings indicated that FNMs/TEPA possessed excellent application prospects in the disposal of wastewater containing Cr(Ⅲ)-EDTA.

关键词： TEPA functionalized magnetic mesoporous silicon Adsorption Cr(III)-EDTA Density functional theory calculations

Passivity-based consensus for linear multi-agent systems under switching topologies

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Control Theory and Technology 2014年第3期12卷 304-316页

作者： zhi FENG Guoqiang hu School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798

This paper studies the passivity-based consensus analysis and synthesis problems for a class of stochastic multi-agent systems with switching topologies. Based on Lyapunov methods, stochastic theory, and graph theory, new different storage Lyapunov functions are proposed to derive sufficient conditions on mean-square exponential consensus and stochastic passivity for multi-agent systems under two different switching cases, respectively. By designing passive time-varying consensus protocols, the solvability conditions for the passivity-based consensus protocol synthesis problem, i.e., passification, are derived based on linearization techniques. Numerical simulations are provided to illustrate the effectiveness of the proposed methods.

关键词： Consensus Linear multi-agent systems Passivity and passification Networks with switching topology

Acute myocardial infarction due to Kounis syndrome:A case report

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World Journal of Clinical Cases 2022年第31期10卷 11555-11560页

作者： guang-zhi Xu Gang Wang Heart Centre The Third Central Hospital of TianjinTianjin Key Laboratory of Extracorporeal Life Support for Critical DiseasesArtificial Cell Engineering Technology Research CenterTianjin Institute of Hepatobiliary DiseaseTianjin 300170China

BACKGROUND Acute myocardial infarction(AMI)can be induced by several ***,AMI induced by Kounis syndrome(an allergic reaction)is extremely rare and is highly susceptible to *** SUMMARY A 70-year-old man presented after suffering an allergic reaction that caused chest pain triggered upon eating ice *** I was found to be elevated,and an electrocardiogram showed ST-segment *** diagnosis was *** underwent two coronary angiographies,with one intravascular ultrasound during hospitalization showing no evidence of atherosclerotic coronary artery *** final diagnosis was vasospastic myocardial infarction due to Kounis *** patient was then treated with hydrocortisone and intravenous antihistamines,and his chest pain symptoms *** Allergic reactions(such as Kounis syndrome)can cause serious damage to the *** should be alert to the consequences and avoid misdiagnosis.

关键词： Acute myocardial infarction Kounis syndrome Allergic reaction Case report Acute coronary syndrome

human lymphohematopoietic reconstitution and immune function in immunodeficient mice receiving cotransplantation of human thymic tissue and CD34＋ cells

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Cellular & Molecular Immunology 2012年第3期9卷 232-236页

作者： Zheng hu Yong-guang Yang Columbia Center for Translational Immunology Columbia University College of Physicians and Surgeons New York NY USA First Bethune Hospital of Jilin University Changchun China

Small animal models with functional human lymphohematopoietic systems are highly valuable for the study of human immune function under physiological and pathological conditions. Over the last two decades, numerous efforts have been devoted towards the development of such humanized mouse models. This review is focused on human lymphohematopoietic reconstitution and immune function in humanized mice by cotransplantation of human fetal thymic tissue and CD34＋ cells. The potential use of these humanized mice in translational biomedical research is also discussed.

关键词： humanized mouse hematopoiesis immune system immunodeficient mouse thymopoiesis

A unified model in the pulsed laser ablation process

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Optoelectronics Letters 2008年第4期4卷 311-316页

作者： hu De-zhi Department of Basic Science North China Institute of Science and Technology Beijing 101601 China

In this unified model,we introduce the electron-phonon coupling time(tie) and laser pulse width(tp).For long pulses,it can substitute for the traditional thermal conduction model;while for ultrashort pulses,it can substitute for the standard two-temperature *** an example of the gold target,we get the dependence of the electron and ion temperature evolvement on the time and position by solving the thermal conduction equation using the finite-difference time-domain(FDTD) *** is in good agreement with experimental *** obtain the critical temperature of the onset of ablation using the Saha equation and then obtain the theoretical value of the laser ablation threshold when the laser pulse width ranges from nano-second to femtosecond timescale,which consists well with the experimental data.

关键词：脉冲激光切除方法统一模型电子-声子耦合超短激光