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On generation source sites of internal waves in the Luzon Strait

Acta Oceanologica Sinica 2008年第3期27卷 38-50页

作者： ZHENG Quanan song y Tony LIN Hui HU Xiaomin MENG Junmin WANG Dan Department of Atmospheric and Oceanic Science University of Maryland College Park Maryland USA Jet Propulsion Laboratory California Institute of Technology Pasadena California USA Institute of Space and Earth Information Sciences The Chinese University of Hong Kong Hong Kong China First Institute of Oceanography. State Oceanic Administration. Oingdao 266061. China

This effort aims to determine the generation source sites in the Luzon Strait for energetic, long-crest, transbasin internal waves （IW） observed in the northern South China Sea （NSCS）. The roles of islands distributed on eastern side of the strait, Kuroshio, submarine ridges, shoaling thennocline, and strait configuration played in the IW generation are examined using the cruise data analysis, satellite data interpretation, and dynamical analysis. The islands and channels on eastern side of the strait are excluded from a list of possible IW source sites owing to their unmatched horizontal dimensions to the scale of IW crest line length, and the relative low Reynolds number. The Kuroshio has a potential to be a radiator for the long-crest IW disturbances, meanwhile, the Kurosbio west （east） wing absorbs the eastward （westward） propagating IW disturbance. Namely, the Kuroshio blockades the outside west-east propagating IW disturbances. The 3-D configuration of the Luzon Strait is characterized by a sudden, more than one order widening of the cross-section areas at the outlets on both sides, providing a favorable condition for IW type initial disturbance formation. In the Luzon Strait, the thermocline is featured by a westward shoaling all the year around, providing the dynamical conditions for the amplitude growth （declination） to the westward （eastward） propagating IW type disturbance. Thus, the west slope of western submarine ridge at the western outlet of the Luzon Strait is a high possibility source sites for energetic, long-crest, transbasin IWs in the NSCS. The interpretation results of satellite SAR images during a 13 a period from 1995 to 2007 provide the convincing evidence for the conclusions.

关键词： ocean internal waves solitary waves Luzon Strait satellite SAR image

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Synthesis and Isolation of Diastereomers of Optically Active Cyclomercurated Ferrocenylimines

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Chinese Chemical Letters 2000年第11期11卷 975-978页

作者： Wu, yJ Cui, XL song, MP Zhou, N Du, CX Zhu, y Zhengzhou Univ Dept Chem Zhengzhou 450052 Peoples R China Zhengzhou Univ Henan Prov Lab Appl Chem Zhengzhou 450052 Peoples R China

Asymmetric cyclomercuration of chiral ferrocenylimines (+)-(R)-2 and (-)-(S)-2 with mercuric acetate and subsequent treatment by lithium chloride gave a mixture of diastereomeric cyclomercurated ferrocenylimines. The four enantiomeric pure compounds with both planar and central chirality were isolated from the two mixtures by the thin layer chromatography.

关键词： Sc KBr IR Hg Cl Synthesis and Isolation of Diastereomers of Optically Active Cyclomercurated Ferrocenylimines

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Synchronous improvement of mechanical properties and stress corrosion resistance by stress-aging coupled with natural aging pre-treatment in an Al-Zn-Mg alloy with high recrystallization fraction

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Journal of Materials Science & Technology 2022年第26期121卷 40-51页

作者： D.Zhang H.C.Jiang Z.J.Cui D.S.yan y.y.song L.J.Rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou 256606China

Enhancing the strength of Al-Zn-Mg alloys is critical to the weight-lightening of structural components in the application of high-speed trains and aerospace industries,while high stress corrosion cracking(SCC)susceptibility of Al-Zn-Mg alloys(especially the alloy with high recrystallization fraction)with high strength makes it *** this study,the influence of tensile stress-aging coupled with natural aging pre-treatment on the mechanical properties and SCC resistance of Al-Zn-Mg alloy with high recrystallization fraction has been *** results show that tensile stress-aging at 160℃can inhibit the dissolution of clusters/Guinier-Preston(GP)zones formed during long-term natural aging pre-treatment,which increases the number density of matrix precipitates(MPts),narrow the width of precipitate free zone(PFZ),and dramatically improve the mechanical properties of the experimental Al-Zn-Mg ***,the precipitation of the high density of MPts within the matrix will assume a large number of solute atoms during artificial aging,which will reduce the supplement of solute atoms to grain *** a result,the volume of anodic active grain boundary precipitates(GBPs)and the content of free solute atoms at grain boundaries are reduced,which reduces the possibility of initial nucleation and propagation of SCC *** coupled treatment method proposed in this study proves efficient in resolving the contradiction between the strength and SCC resistance in Al-Zn-Mg alloy.

关键词： Al-Zn-Mg alloy Natural aging Stress-aging Precipitates Stress corrosion cracking

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Note on higher-point correlation functions of the TT or JT deformed CFTs

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Science China(Physics,Mechanics & Astronomy) 2021年第9期64卷 15-28页

作者： song He Center for Theoretical Physics College of PhysicsJilin UniversityChangchun 130012China Max Planck Institute for Gravitational Physics(Albert Einstein Institute) Am M¨uhlenberg 1Golm 14476Germany

We investigate generic n-point correlation functions of conformal field theories(CFTs),with TT and JT deformations,in terms of the perturbative CFT *** systematically obtain the first order correction to the generic correlation functions of CFTs with TT or JT *** compute the out of time ordered correlation function(OTOC)in the Ising model with TT or Jdeformation,which confirms that these deformations do not change the integrable property up to the first order level.

关键词： integrable deformation conformal field theory quantum chaos quantum integrability quantum entanglement

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Variant selection in additively manufactured alpha-beta titanium alloys

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Journal of Materials Science & Technology 2022年第18期113卷 14-21页

作者： S.L.Lu C.J.Todaro y.y.Sun T.song M.Brandt M.Qian Centre for Additive Manufacturing School of Engineering RMIT University School of Mechanical and Aerospace Engineering Nanyang Technological University

Alpha-beta(α-β)titanium alloys such as Ti-6Al-4V(wt.%,here-after the same)and Ti-6Al-2Sn-4Zr-2Mo fabricated by fusion-based additive manufacturing(AM)typically exhibit a strong columnar prior-βgrain *** columnar prior-βgrains with their001along the build direction not only lead to solidification tex-ture but also cause subsequentα-phase textures[1].The forma-tion of theseα-phase textures is a consequence of theβ→αtransformation obeying the Burgers orientation relationship(BOR)[1-5],which results in[0001]of theα-phase being orientated at about either 45°or 0°relative to the *** affect the deformation behaviour and mechanical properties[1,6].Defined by the BOR,a singleβ-phase grain can bring forth 12α-phase vari-ants[2,7],leading to significant microstructural ***α-phase variants do not form randomly in eachβ-phase ***,their formation displays specific crystallographic features,known asα-variant selection,which is common in Ti *** an extreme case,α-variant selection can lead to the formation of a singleα-phase crystal through anα→β→αtransformation cy-cle[8,9].

关键词： alloys grain transformation

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Towards creep property improvement of selective laser melted Ni-based superalloy IN738LC

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Journal of Materials Science & Technology 2022年第17期112卷 301-314页

作者： H.y.song M.C.Lam y.Chen S.Wu P.D.Hodgson X.H.Wu y.M.Zhu A.J.Huang Monash Centre for Additive Manufacturing 15-17 Normanby RdNotting HillVIC 3168Australia Department for of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia Monash Centre for Electron Microscopy 10 Innovation WalkClaytonVIC 3800Australia Institute for Frontier Materials Deakin UniversityVIC 3216Australia

Nickel-based superalloy IN738LC produced by selective laser melting(SLM)exhibits inferior hightemperature creep properties than its cast counterparts due to relatively smaller grain size,particularly for the plane normal to the building *** work studied effects of post heating strategy on the microstructure and especially the grain size to improve the high temperature creep *** asbuilt microstructure exhibited a fine grain size and large quantities of MC carbides that could effectively hinder grain *** was found that unconventional two-step heat treatments could lead to substantial grain growth,and the effect is particularly prominent at a specific *** ease of grain growth was explained after classifying the microstructural evolution(boundary carbide transformation)during each heating step and related to the reduced grain boundary pinning force from MC *** tests validated the effect of the new heat treatment scheme on the SLM-processed IN738LC at 850℃.An extended creep fracture life(1.5 to 4 times improvement)and lower secondary creep rates were achieved with samples subjected to the newly optimized two-step heat *** complete creep curves are also firstly presented for SLM-IN738LC,confirming the effectiveness of grain growth and highlighting the importance of dedicated heat treatment for SLM superalloys.

关键词： Selective laser melting IN738LC alloy Creep properties Heat treatments Grain structure

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多模式网络化控制系统稳定性分析

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控制理论与应用 2006年第5期23卷 749-755页

作者：郑刚谭民 song y H 中国科学院软件研究所通用软件实验室北京100080 中国科学院自动化研究所北京100080 布鲁内尔大学电子与计算机工程系英国伦敦

网络传输引起的时滞在网络化控制系统中经常出现．针对存在多个运动模式的网络化控制系统,建立了时滞混杂自动机模型,分析了系统平衡点的稳定性,给出了平衡点保持稳定的充分条件在于构造的与离散状态相关的Lyapunov泛函在离散状态的切... 详细信息

网络传输引起的时滞在网络化控制系统中经常出现．针对存在多个运动模式的网络化控制系统,建立了时滞混杂自动机模型,分析了系统平衡点的稳定性,给出了平衡点保持稳定的充分条件在于构造的与离散状态相关的Lyapunov泛函在离散状态的切换时刻是非增的．当时滞混杂自动机中连续性子系统为线性时不变时滞系统时,可以利用线性矩阵不等式方法来寻找系统的公共Lyapunov泛函,并求解使系统平衡点保持稳定的时滞上界．最后,给出了一个例子说明了分析结果．

关键词：网络控制混杂系统稳定性时滞系统线性矩阵不等式

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Plastic Effect on the Sliding Inception Bet ween a Cylinder and a Rigid Flat

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Acta Mechanica Solida Sinica 2019年第1期32卷 1-16页

作者： S.Zhang J.Huan H.song X.Liu y.G.Wei LNM Institute of MechanicsChinese Academy of SciencesBeijing 100190China Department of Mechanical Engineering Johns Hopkins UniversityBaltimoreMD 21218USA College of Engineering Peking UniversityBeijing 100871China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

The effec ts of mat erial plasticity and local slip on the sliding inception of asperity are studied in the present ***,a semi-analytical solution is derived under the full-stick condition to analyze the effect of material plasticity on sliding ***,a friction model with contact stiffness criterion is proposed to study the cases from partial-slip condition to full-stick *** element simulations with the provided model are used to present the friction *** friction coefficient of full-s tick interface converges at a st able value,approxima tely *** saturation appears as the normalized contact interference u*is larger than 3.A transition mechanism from slip-dominated to yield-dominated takes place in the sliding *** simulation results are compared with the semi-analytical solution.

关键词： Mat erial yielding Local slip Contact stiffness criterion Finite element simulation

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Suppressing meta-holographic artifacts by laser coherence tuning

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Light(Science & Applications) 2021年第7期10卷 1236-1246页

作者： yaniv Eliezer Geyang Qu Wenhong yang yujie Wang Hasan yılmaz Shumin Xiao Qinghai song Hui Cao Department of Applied Physics Yale UniversityNew HavenCT 06520USA Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology(Shenzhen)Shenzhen 518055P.R.China

A metasurface hologram combines fine spatial resolution and large viewing angles with a planar form factor and compact ***,it suffers coherent artifacts originating from electromagnetic cross-talk between closely packed meta-atoms and fabrication defects of nanoscale ***,we introduce an efficient method to suppress all artifacts by fine-tuning the spatial coherence of *** method is implemented with a degenerate cavity laser,which allows a precise and continuous tuning of the spatial coherence over a wide range,with little variation in the emission spectrum and total *** find the optimal degree of spatial coherence to suppress the coherent artifacts of a meta-hologram while maintaining the image *** work paves the way to compact and dynamical holographic displays free of coherent defects.

关键词： holographic coherent illumination

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Formation mechanism of large grains inside annealed microstructure of GH4169 superalloy by cellular automation method

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Journal of Materials Science & Technology 2019年第7期35卷 1403-1411页

作者： Ming-song Chen Zong-Huai Zou y.C.Lin Hong-Bin Li Guan-Qiang Wang School of Mechanical and Electrical Engineering Central South UniversityChangsha410083China State Key Laboratory of High Performance Complex Manufacturing Changsha410083China College of metallurgies and energy North China Science and Technologies UniversityTangshan063009China

In authors’ previous work [Mater. Charact. 141 (2018) 212-222]. it was found that the heterogeneous deformed microstructures can be replaced by the relatively homogeneous recrystallized grains through an annealing treatment. However, there are still some relatively large recrystallized grains. To find the reasons for the formation of large grains, some new annealing treatment tests were done, and the cellular automation (CA) simulations were carried out in the present work. The experimental results showed that the microstructural evolution during annealing treatment is significantly affected by the content of S phase. So. the effects of δ phase on the nucleation and growth of grains are carefully considered in the CA model to accurately simulate the microstructural evolution behavior. By the CA simulation, it is found that the dislocation density rapidly decreases due to the nucleation of static recrystallization (SRX) and the growth of dynamc recrystallization (DRX) nuclei at the early stage of annealing. The high initial dislocation density provide the high velocity for the growth of DRX nuclei, which is responsible for the formation of coarse grains, However, the growth rate of SRX nuclei is relatively small due to the low dislocation density and pinning effects of δ phase.

关键词： GH4169 superalloy Cellular automation model Coarse grains Annealing treatment Recrystallization behavior

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