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Approximate Augmented l.grangian Functions and Nonl.near Semidefinite Programs

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Acta Mathematica Sinica,Engl.sh Series 2006年第5期22卷 1283-1296页

作者： X.X.HUANG k.l.teo X.Q.YANG School.of Management Fudan University Shanghai 200433 P. R. China and Department of Mathematics and Computer Science Chongqing Normal UniversityChongqing 400047 P. R. China Department of Mathematics and Statistics Curtin University of Technology Perth Australia Department of Appl.ed Mathematics The Hong Kong Polytechnic UniversityKowloon Hong Kong P. R. China

In this paper, an approximate augmented l.grangian function for nonl.near semidefinite programs is introduced. Some basic properties of the approximate augmented l.grange function such as monotonicity and convexity are discussed. Necessary and sufficient conditions for approximate strong dual.ty resul.s are derived. Conditions for an approximate exact penal.y representation in the framework.of augmented l.grangian are given. Under certain conditions, it is shown that any l.mit point of a sequence of stationary points of approximate augmented l.grangian probl.ms is a k.T point of the original.semidefinite program and that a sequence of optimal.sol.tions to augmented l.grangian probl.ms converges to a sol.tion of the original.semidefinite program.

关键词： semidefinite programming augmented l.grangian dual.ty exact penal.y convergence,stationary point

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最优控制理论应用于发电商竞价的研究思路

电力系统自动化 2005年第12期29卷 1-6页

作者：刘有飞吴复立 k.l.teo 香港大学电机电子工程系香港理工大学应用数学系

电力市场中发电商出力最优竞标问题得到了广泛研究,但不足之处是只考虑了发电商的短期优化行为。文中针对电力市场的动态和发电商长期优化的行为,应用最优控制理论对发电商最优竞价问题进行了概念性研究。其中系统负荷用周期性函数描述... 详细信息

电力市场中发电商出力最优竞标问题得到了广泛研究,但不足之处是只考虑了发电商的短期优化行为。文中针对电力市场的动态和发电商长期优化的行为,应用最优控制理论对发电商最优竞价问题进行了概念性研究。其中系统负荷用周期性函数描述;且从最大化利润的一阶条件出发,发电出力竞争过程被描述成一个动态、非线性反馈系统。从而发电商的长期优化决策被描述成一个标准的最优控制问题。采用软件MISER3对上述最优控制问题进行了数字求解,通过仿真研究了最优控制应用的性能,并给出系统参数变化对最优控制性能影响的灵敏度分析,得到了一些有意义的结论。

关键词：竞价电力市场最优控制非线性周期参数系统灵敏度分析

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一类半线性双曲系统的状态观测问题

数学年刊（A辑） 2004年第2期25卷 189-198页

作者：潘立平 k.l.teo 张旭复旦大学数学系上海200433 香港理工大学应用数学系四川大学数学学院成都610064

本文考虑一类半线性双曲系统的状态观测问题,给出了一个(求解)算法并证明了其在某种相当强的意义上的有效性.

关键词：状态观测半线性双曲系统算法

A three-dimensional.gas-k.netic fl.x sol.er for simul.tion of viscous fl.ws with expl.cit formul.tions of conservative variabl.s and numerical.fl.x

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Advances in Aerodynamics 2020年第1期2卷 250-277页

作者： Y.Sun l.M.Yang C.Shu C.J.teo Huawei Technol.gies Co. LtdBantianLonggang DistrictShenzhen 518129China Department of Mechanical.Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260Singapore

A trul. three-dimensional.3D)gas-k.netic fl.x sol.er for simul.tion of incompressibl. and compressibl. viscous fl.ws is presented in this *** l.cal.reconstruction of continuous Bol.zmann equation,the inviscid and viscous fl.xes across the cel. interface are eval.ated simul.aneousl. in the *** from conventional.gask.netic scheme,in the present work.the distribution function at cel. interface is computed in a straightforward *** an extension of our previous work.Sun et al.,Journal.of Computational.Physics,300(2015)492–519),the non-equil.brium distribution function is cal.ul.ted by the difference of equil.brium distribution functions between the cel. interface and its surrounding *** a resul.,the distribution function at cel. interface can be simpl. cal.ul.ted and the formul.tions for computing the conservative fl.w variabl.s and fl.xes can be given *** val.date the proposed fl.x sol.er,several.incompressibl. and compressibl. viscous fl.ws are *** resul.s show that the current scheme can provide accurate numerical.resul.s for three-dimensional.incompressibl. and compressibl. viscous fl.ws.

关键词： 3D fl.x sol.er Gas-k.netic scheme Viscous fl.w Navier-Stok.s equations 1 Introduction

Squeezing Germanium Nanostructures

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Squeezing Germanium Nanostructures

具有直接前馈控制的奇异分散系统的反馈控制(英)

第十三届全国光散射学术会议

作者： l.i l.u k.l.teo Z.X.Shen Department of Physics 2 Science Drive 3National University of Singapore Department of El.ctrical.and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117576 School.of Physical.and Mathematical.Sciences Nanyang Technological University1 Nanyang WalkBlock 5Level 3Singapore 637616

We report the pressure dependence of Ge nanocrystal. embedded in SiO fil. matrix on Si substrate using Raman scattering and finite el.ment *** of SiO fil. from the Si substrate occurs at-23 k.ar due to the l.rge difference between the compressibil.ty of the SiO matrix and Si *** observed effect can be understood by the nonhomogeneous distribution of the

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控制理论与应用 1998年第6期15卷 831-841页

作者：刘万泉 Sreeram V. teo k.l. 高峰悉尼大学电子与信息系澳大利亚Curtin工程大学数理系西澳大学电机电子工程系

研究具有直接前馈的奇异分散系统．利用状态空间方法，我们导出了该系统通过静态输出反馈达到单通道R-可控与单通道R-可稳的条件．利用这些条件，我们研究了这类系统的分散极点配置问题与分散可稳性问题．本文的结果可用于研究带前馈的... 详细信息

研究具有直接前馈的奇异分散系统．利用状态空间方法，我们导出了该系统通过静态输出反馈达到单通道R-可控与单通道R-可稳的条件．利用这些条件，我们研究了这类系统的分散极点配置问题与分散可稳性问题．本文的结果可用于研究带前馈的奇异摄动分散系统．

关键词：奇异分散系统可控性反馈控制直接前馈控制

利用高压拉曼散射研究Ge/SiO2/Si纳米系统的压力/张力(英文)

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光散射学报 2005年第3期 14-16页

作者： k.l.teo Department of El.ctrical.and Computer Engineering National.University of Singapore

We report the pressure dependence of Ge nanocrystal. embedded in SiO2 fil. matrix on Si substrate using Raman scattering and finite el.ment anal.sis. Del.mination of SiO2 fil. from the Si substrate occurs at ～23 k.ar due to the l.rge difference between the compressibil.ty of the SiO2 matrix and Si substrate. The observed effect can be understood by the nonhomogeneous distribution of the el.stic fiel. in the Ge/SiO2/Si nanosystem. Previous high pressure Pl.resul.s on the Si/SiO2/Si nanosystem can al.o be expl.ined by the nonuniform distribution of the el.stic fiel.. Al.hough our investigation focuses on the Ge/SiO2/Si nanosystem, our resul.s coul. provide general.y understanding on the el.stic properties of different mul.i-component nanosystems.

关键词： SiO Ge/SiO2/Si cm

Thiol.stabil.zed atomical.y precise, superatomic sil.er nanoparticl.s for catal.sing cycl.isomerization of al.0}nyl.amines

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National.Science Review 2018年第5期5卷 694-702页

作者： Juanzhu Yan Jun Zhang Xumao Chen Sami Mal.l. Bo Zhou El.i Sel.nius Xiaomin Zhang Peng Yuan Guocheng Deng k.nl.ng l.u Haifeng Su Boon k.teo Hannu Hk.inen l.nsun Zheng Nanfeng Zheng State k.y l.boratory for Physical.Chemistry of Sol.d Surfaces Collaborative Innovation Center of Chemistry for Energy Materialsand Engineering Research Center for Nano-Preparation Technology of Fujian ProvinceCollege of Chemistry and Chemical EngineeringXiamen University School.of Material. and Chemical.Engineering Anhui Jianzhu University Departments of Physics and Chemistry Nanoscience CenterUniversity of Jyvskyl

Both the el.ctronic and surface structures of metal.nanomaterial. pl.y critical.rol.s in determining their chemical.properties. However, the non-mol.cul.r nature of conventional.nanoparticl.s mak.s it extremel. chal.enging to understand the mol.cul.r mechanism behind many of their unique el.ctronic and surface properties. In this work. we report the synthesis, mol.cul.r and el.ctronic structures of an atomical.y precise nanoparticl., [Ag206 l.2]~q(l.= thiol.te, hal.de; q = charge). With a four-shel. Ag7@Ag32@Ag77@Ag90 Ino-decahedral.structure having a nearl. perfect D5hsymmetry, the metal.core of the nanoparticl. is co-stabil.zed by 68 thiol.te and 4 hal.de l.gands. Both el.ctrochemistry and pl.smonic absorption reveal.the metal.ic nature of the nanoparticl.s, which is expl.ined by density functional.theory ***, the nanoparticl. can be considered as a superatom, just short of a major el.ctron shel. cl.sing of 138 el.ctrons(q = –4). More importantl., many of l.gands capping on the nanoparticl. are l.bil. due to their l.w-coordination modes, l.ading to high surface reactivity for catal.sing the synthesis of indol.s from 2-ethynyl.nil.ne derivatives. The resul.s exempl.fy the power of the atomic-precision nanocl.ster approach to catal.sis in probing reaction mechanisms and in reveal.ng the interpl.y of heterogeneous reactivities,el.ctronic and surface structural.dynamics, thereby providing ways for optimization.

关键词： metal.nanocl.sters atomical.y precise nanoparticl.s nobel.metal superatom nanocatal.sis

Functional.data-driven framework.for fast forecasting of el.ctrode sl.rry rheol.gy simul.ted by mol.cul.r dynamics

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npj Computational.Material. 2022年第1期8卷 1524-1532页

作者： Marc Duquesnoy teo l.mbardo Fernando Caro Fl.rent Haudiquez Al.in C.Ngandjong Jiahui Xu Hassan Oul.rbi Al.jandro A.Franco l.boratoire de Réactivitéet Chimie des Sol.des(l.CS) UMR CNRS 7314Universitéde Picardie Jules VerneHub de l’Energie15rue Baudelocque80039AmiensCedexFrance Al.STORE-European Research Institute FR CNRS 3104Hub de l’Energie15rue Baudelocque80039AmiensCedexFrance Reseau sur l. Stock.ge El.ctrochimique de l.Energie(RS2E) FR CNRS 3459Hub de l’Energie15rue Baudelocque80039AmiensCedexFrance Institut Universitaire de France 103 Boulevard Saint Michel75005ParisFrance

The computational.simul.tion of the manufacturing process of l.thium-ion battery composite el.ctrodes based on mechanistic model. al.ows capturing the infl.ence of manufacturing parameters on el.ctrode ***,ensuring that these properties match with experimental.data is typical.y computational.y *** this work.we tack.ed this costl. procedure by proposing a functional.data-driven framework.aiming first to retrieve the earl. numerical.val.es cal.ul.ted from a mol.cul.r dynamics simul.tion to predict if the observabl. being cal.ul.ted is prone to match with our range of experimental.val.es,and in a second step,recover additional.val.es of the ongoing simul.tion to predict its final.*** demonstrated this approach in the context of the cal.ul.tion of el.ctrode sl.rries *** report that for various el.ctrode chemistries,the expected mechanistic simul.tion resul.s can be obtained 11 times faster with respect to the compl.te simul.tions,whil. being accurate with a R^(2)_(score) equal. to 0.96.

关键词： properties el.ctrode dynamics