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Ch.nese j.urnal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li j. Mei h. Li S. Tianj.n University China Tsingh.a Sh.nzh.n International Graduate Sch.ol China Lanzh.u j.aotong University China

Th. rapid development of clean and renewable energy tech.ologies represented by wind and solar energy,as well as th. continuous growth.of load demand,h.ve put forward h.gh.r requirements for th. safe operation of th. power *** performance of power equipment based on traditional dielectric materials is often limited by various defects generated during molding,transportation,assembly,and operation,wh.ch.cannot meet th. reliability requirements of power systems in th. new *** detection is an essential tech.ical meth.d in industrial development,wh.ch.can detect and evaluate th. defect and damage status of in-service equipment,key components,and materials with.ut damaging th. obj.ct.

关键词： service Application operation

Effect of Polarization Dependent Loss on Polarization-Multiplexed Transmission System

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光学学报 2003年第S1期23卷 641-642页

作者： h. C. j. j. h. lee K. j. Park Y. C. Ch.ng Department of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 KoreaNEC corporation Networking Research Laboratories Kawasaki JapanDepartment of Electrical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea

We report on th. effects of th. polarization-dependent loss (PDL) on th. polarization-multiplexed system. Th. result sh.ws th.t th. PDL of 0.9 dB could cause 1-dB power penalty. Unlike PMD, th. effect of PDL was not d... 详细信息

关键词： PDL as of Effect of Polarization Dependent Loss on Polarization-Multiplexed Transmission System on

Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mech.nisms

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j.urnal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： h.T.j.ong S.W.lee W.j.Kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

Th. superplastic beh.vior and associated deformation mech.nisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with.a grain size of 3.2μm,primarily composed of th. BCCβph.se and a small amount of th. h.Pαph.se,were examined in a temperature range of 473 K to 623 *** microstructural refinement of th.s alloy was ach.eved by employing h.gh.ratio differential speed *** best superplasticity was ach.eved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),wh.re tensile elongations of 550±600%were *** th. h.ating and h.lding stage of th. tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider th.s effect wh.n analyzing and understanding th. superplastic deformation beh.vior and *** th. investigated strain rate range,th. superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,wh.le at h.gh.strain rates,lattice diffusion-controlled dislocation climb creep was th. rate-controlling deformation *** was concluded th.t solute drag creep is unlikely to *** th. late stages of deformation at 523 K,it was observed th.t grain boundary sliding led to th. agglomeration of th.αph.se,resulting in significant strain *** mech.nism maps were constructed forβ-Mg-Li alloys in th. form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using th. constitutive equations for various deformation mech.nisms derived based on th. data of th. current tests.

关键词： Magnesium-lith.um alloy Superplasticity Severe plastic deformation Grain size Grain growth

Geograph.cal distribution of red and green Noctiluca scintillans

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Ch.nese j.urnal of Oceanology and Limnology 2011年第4期29卷 807-831页

作者： P. j. h.RRISON K. FURUYA P. M. GLIBERT j. Xu h. B. LIU K. YIN j. h. W. lee D. M. ANDERSON R. GOWEN A. R. AL-AZRI A. Y. T. h. h.ng Kong University of Science and Tech.ology Clear Water Bay Hong Kong China Department of Aquatic Bioscience University of Tokyo Tokyo 113-8657 Japan University of Maryland Center for Environmental Science Horn Point Laboratory Cambridge MD 21613 USA Sch.ol of Marine Sciences Sun Yat-Sen University Guangzhou 510275 China Department of Biology Woods Hole Oceanographic Institution Woods Hole MA 02543 USA Fish.ries and Aquatic Ecosystems Branch Agri-Food and Biosciences Institute Belfast BT9 5PX UK Department of Marine Science and Fish.ries Sultan Qaboos University Muscat 123 Sultanate of Oman Agriculture Fisheries and Conservation Department Hong Kong China

Th. dinoflagellate Noctiluca scintillans is one of th. most important and abundant red tide organisms and it is distributed world-wide. It occurs in two forms. Red Noctiluca is h.terotroph.c and fills th. role of one of th. microzooplankton grazers in th. foodweb. In contrast, green Noctiluca contains a ph.tosynth.tic symbiont Pedinomonas noctilucae (a prasinoph.te), but it also feeds on oth.r plankton wh.n th. food supply is abundant. In th.s review, we document th. global distribution of th.se two forms and include th. first maps of th.ir global distribution. Red Noctiluca occurs widely in th. temperate to sub-tropical coastal regions of th. world. It occurs over a wide temperature range of about 10°C to 25°C and at h.gh.r salinities (generally not in estuaries). It is particularly abundant in h.gh.productivity areas such.as upwelling or eutroph.c areas wh.re diatoms dominate since th.y are its preferred food source. Green Noctiluca is much.more restricted to a temperature range of 25°C-30°C and mainly occurs in tropical waters of South.ast Asia, Bay of Bengal (east coast of India), in th. eastern, western and north.rn Arabian Sea, th. Red Sea, and recently it h.s become very abundant in th. Gulf of Oman. Red and green Noctiluca do overlap in th.ir distribution in th. eastern, north.rn and western Arabian Sea with.a seasonal sh.ft from green Noctiluca in th. cooler winter convective mixing, h.gh.r productivity season, to red Noctiluca in th. more oligotroph.c warmer summer season.

关键词：夜光藻地理分布微型浮游动物温度范围阿拉伯海赤潮生物食草动物光合作用

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Communications in Nonlinear Science and Numerical Simulation 1999年第3期4卷 186-190页

作者： Guoqian Ch.N and j. h. W. lee(Centre for Environmental Sciences, Peking University, Beij.ng 100871, Ch.na) (Department of Civil Engineering, University of h.ng Kong, h.ng Kong, Ch.na) Centre for Environmental Sciences Peking University Beijing 100871 China Department of Civil Engineering University of Hong Kong Hong Kong China

IntroductionTh.th.rmal,abodyofbuoyalfluidinafluidwith.h.ch.tcanmixandgivennamebygliderpilotstoth.semassesofwarmairrisingfromh.tgroundwarmedbysunsh.neinwh.ch.h.ycansoar,***],duetoi... 详细信息

IntroductionTh.th.rmal,abodyofbuoyalfluidinafluidwith.h.ch.tcanmixandgivennamebygliderpilotstoth.semassesofwarmairrisingfromh.tgroundwarmedbysunsh.neinwh.ch.h.ycansoar,***],duetoi...

关键词： environmental fluid mech.nics th.rmal turbulence modeling

Turbulent Gravity Current of Lock Release Type: A Numerical Study

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Communications in Nonlinear Science and Numerical Simulation 1999年第1期4卷 20-24页

作者： G. Q. Ch.N(Centre for Environment Sciences, Peking University, Beij.ng 100871, Ch.na) and j. h. W. lee(Department of Civil Engineering, University of h.ng Kong, h.ng Kong, Ch.na) Centre for Environment Sciences Peking University Beijing 100871 China Department of Civil Engineering University of Hong Kong Hong Kong Hong Kong

Th. time evolution of a turbulent gravity current of lock release type, formed by a finite volume of h.mogenous fluid released instantaneously into anoth.r fluid of sligh.ly lower density, is studied numerically via th. renormalization group (RNG) k - model for Reynolds-stress closure to ch.racterize th. flow with.transitional and h.gh.y localized turbulence. Consistent with.previous experimental observations th. numerical results sh.w th.t th. gravity current passes th.ough.two distinct ph.ses, an initial slumping ph.se in wh.ch.th. current h.ad advances steadily, and a second self-similar ph.se in wh.ch.th. front velocity decreases like th. negative th.rd power of th. time after release. An overall entrainment ratio proportional to th. distance from th. release point is found and compares well with.available experimental data for th. slumping ph.se.

关键词： turbulent flow gravity current numerical simulation

Th. quasi-Gramian solution of a non-commutative extension of th. h.gh.r-order nonlinear Sch.?dinger equation

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Communications in Th.oretical Ph.sics 2024年第3期76卷 51-61页

作者： h.W A Riaz j.Lin Department of Ph.sics Zhejiang Normal UniversityJinhua 321004China

Th. nonlinear Sch.?dinger(NLS)equation,wh.ch.incorporates h.gh.r-order dispersive terms,is widely employed in th. th.oretical analysis of various ph.sical *** th.s study,we explore th. non-commutative extension of th. h.gh.r-order NLS *** treat real or complex-valued functions,such.as g_(1)=g_(1)(x,t)and g_(2)=g_(2)(x,t)as non-commutative,and employ th. Lax pair associated with.th. evolution equation,as in th. commutation *** derive th. quasi-Gramian solution of th. system by employing a binary Darboux *** soliton solutions are presented explicitly with.n th. framework of *** visually understand th. dynamics and solutions in th. given example,we also provide simulations illustrating th. associated ***,th. solution can be used to study th. stability of plane waves and to understand th. generation of periodic patterns with.n th. context of modulational instability.

关键词： integrable systems Darboux transformation solitons

Convexification of h.brid AC-DC Optimal Power Flow with.Line-Commutated Converters

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CSEE j.urnal of Power and Energy Systems 2024年第2期10卷 617-628页

作者： h.ngyuan Liang Zh.gang Li j.h.Zh.ng Q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Line-commutated converter (LCC)-based h.gh.voltage DC (h.DC) systems h.ve been integrated with.bulk AC power grids for interregional transmission of renewable power. Th. nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of h.brid AC-DC power grids. A convexification meth.d for th. LCC station model could address such.nonconvexity but h.s rarely been discussed. We devise an equivalent reformulation for classical LCC station models th.t facilitates second-order cone convex relaxation for th. OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with.its proof. Equivalence of th. proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of th. original OPF can be efficiently obtained from relaxed model.

关键词： AC-DC power system convex relaxation linecommutated converter optimal power flow second-order cone programming

两种不同气体中的高速爆燃波及其向爆轰的转变

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实验力学 2008年第2期23卷 110-117页

作者：朱雨建杨基明 j. h. S. lee 中国科学技术大学近代力学系合肥230027 Department of Mech.nical Engineering McGill UniversityMontrealCA

对2C2h.+5O2及2C2h.+5O2+80%Ar两种可燃混合气体中的高速爆燃波及其向爆轰的转变过程进行实验研究。高速爆燃波由孔栅干涉爆轰波的方法直接生成,观测手段则以高速转鼓摄影获取孔栅近场流场x-t纹影图,以传感器追踪波面的后继发展。研究发... 详细信息

对2C2h.+5O2及2C2h.+5O2+80%Ar两种可燃混合气体中的高速爆燃波及其向爆轰的转变过程进行实验研究。高速爆燃波由孔栅干涉爆轰波的方法直接生成,观测手段则以高速转鼓摄影获取孔栅近场流场x-t纹影图,以传感器追踪波面的后继发展。研究发现,两种气体中的爆燃波具有迥异的特性。前者燃烧波面在较低初压条件下为层流结构,而较高初压下为湍流结构,向爆轰转变点可以延伸至下游较长距离;后者在不同初压条件下燃烧波面无明显差异,爆轰的再次形成只能在孔栅下游近场内建立。两种气体中高速爆燃波的维持和爆轰转变过程均非纯粹激波压缩所致,湍流输运在其中起着必不可少的作用。分析显示,激波压缩效应对纯氧炔气体的高速爆燃和DDT贡献较小,湍流输运占主导地位;而氩气稀释气体较为稳定,缺乏自行衍生剧烈湍流燃烧的能力,因而激波压缩和外界扰动对其高速爆燃传播和爆轰转变起十分重要的作用。

关键词：高速爆燃爆燃转爆轰孔栅纹影迹线

Two-dimensional line th.rmal

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Communications in Nonlinear Science and Numerical Simulation 2000年第3期5卷 91-97页

作者： G. Q. Ch.N and j. h. W. lee(a) Centre for Environmental Sciences / State Key Laboratory for Th.bulence Research. Peking University, Beij.ng 100871 b)Institute of Environmental Sciences, Beij.ng Normal University, Beij.ng 100875 e-mail: gqch.n@ns.nlspku. a Centre for Environmental Sciences / State Key Laboratory for Turbulence Research Peking University Beijing 100871 China Institute of Environmental Sciences Beijing Normal University Beijing 100875 China

Th. time evolution of a two-dimensional line th.rmal - a turbulent flow produced by an initial element with.significant buoyancy released in a large water body, is numerically studied using th. two-equation k-e model ... 详细信息

关键词： th.rmal and plume environmental fluid mech.nics