检索结果-南通市图书馆

On-chip photonic Fourier transform with surface plasmon polaritons

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 618-623页

作者： shan shan kou Guanghui Yuan Qian Wang Luping Du Eugeniu Balaur Daohua Zhang Dingyuan Tang Brian Abbey Xiao-Cong Yuan Jiao Lin Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVIC 3086Australia Australian Research Council Centre of Excellence for Advanced Molecular Imaging Australia School of Physics The University of MelbourneVIC 3010Australia Centre for Disruptive Photonic Technologies Nanyang Technological UniversitySingapore 637371Singapore Institute of Materials Research and Engineering A*STAR3 Research LinkSingapore 117602Singapore Nanophotonics Research Centre Shenzhen University&Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Engineering RMIT UniversityMelbourneVIC 3001Australia

The Fourier transform(FT),a cornerstone of optical processing,enables rapid evaluation of fundamental mathematical operations,such as derivatives and ***,a converging lens performs an optical FT in free space when light passes through *** speed of the transformation is limited by the thickness and the focal length of the *** using the wave nature of surface plasmon polaritons(SPPs),here we demonstrate that the FT can be implemented in a planar configuration with a minimal propagation distance of around 10 mm,resulting in an increase of speed by four to five orders of *** photonic FT was tested by synthesizing intricate SPP waves with their Fourier *** reduced dimensionality in the minuscule device allows the future development of an ultrafast on-chip photonic information processing platform for large-scale optical computing.

关键词： diffraction Fourier optics optical computing optical information processing surface plasmon polaritons

Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2019年第9期7卷 1042-1050页

作者： CHEN LIU MICHAEL MALEK IVAN POON LANZHOU JIANG ARIF MSIDDIQUEE COLIN JRSHEPPARD ANN ROBERTS HARRY QUINEY DOUGUO ZHANG XIAOCONG YUAN JIAO LIN CHRISTIAN DEPEURSINGE PIERRE MARQUET shan shan kou Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen518060China Department of Chemistry and Physics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVictoria3086Australia Department of Optics and Optical Engineering Anhui Key Laboratory of Optoelectronic Science and TechnologyUniversity of Science andTechnology of ChinaHefei230026China Department of Biochemistry and Genetics La Trobe Institute for Molecular Science(LIMS)La Trobe UniversityMelbourneVictoria3086Australia Australian Research Council(ARC) Centre of Excellence in Advanced Molecular ImagingAustralia Istituto Italiano di Tecnologia Genova16163Italy School of Physics University of MelbourneVictoria3010Australia School of Engineering RMIT UniversityMelbourneVictoria3001Australia Microvision and Microdiagnostic Group(SCI STI CHD) Ecole Polytechnique Federale de Lausanne(EPFL)1015LausanneSwitzerland Laboratory for Cellular Imaging and Energetics Biological and Environmental Sciences and Engineering DivisionKing Abdullah University ofScience and Technology(KAUST)Thuwal23955-6900Saudi Arabia Joint International Research Unit in Neurodevelopment and Child Psychiatry CHUVDepartement de PsychiatrieLausanneSwitzerlandUniversiteLavalQuebecCanada Institut universitaire en santementale de Quebec QuebecCanada Centre d’optique photonique et laserDepartment of Psychiatry and NeuroscienceUniversiteLaval2375rue de la TerrasseQuebecQC G1V0A6Canada

We report a dual-contrast method of simultaneously measuring and visualizing the volumetric structural information in live biological samples in three-dimensional(3D) space. By introducing a direct way of deriving the 3D scattering potential of the object from the synthesized angular spectra, we obtain the quantitative subcellular morphology in refractive indices(RIs) side-by-side with its fluorescence signals. The additional contrast in RI complements the fluorescent signal, providing additional information of the targeted zones. The simultaneous dual-contrast 3D mechanism unveiled interesting information inaccessible with previous methods, as we demonstrated in the human immune cell(T cell) experiment. Further validation has been demonstrated using a Monte Carlo model.

关键词： Fourier red Carlo Monte image Simultaneous dual-contrast three-dimensional imaging in live cells via optical diffraction tomography and fluorescence

A Novel Biomass Supported Na_2CO_3 System for Flue Gas Desulfurization

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2002年第9期13卷 903-906页

作者： Hong shan shanG Yuan kou Fan YANG College of Chemistry&Molecular Engineering Peking UniversityBeijing 100871.

The breakthrough and stoichiometric SO2 adsorption efficiencies of a biomass supported Na2CO3 system (80 wt %Na2CO3/straw) have reached 48.9 % and 80.6 % respectively at a desulfurization temperature of 80C.

关键词： Straw adsorption efficiency SO2.

Improved tensile properties of Al_(0.5)CoCrFeNi high-entropy alloy by tailoring microstructures

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第9期40卷 2508-2513页

作者： Si-Zhe Niu Hong-Chao kou Jun Wang Jin-shan Li State Key Laboratory of Solidiﬁcation Processing Northwestern Polytechnical UniversityXi’an 710072China

The effect of heat treatment on microstructure and tensile properties of as-cast Al_(0.5)CoCrFeNi high-entropy alloy was investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM) equipped with energy-dispersive spectroscopy(EDS), and tensile *** results show that heat treatment strongly affects the microstructure, particularly the morphology of bcc phases,and improves tensile properties. Microstructure analysis reveals that rod-shaped and elliptoid phases appear in the matrix after heat treatment at 1150 ℃. Besides, under850 ℃ heat-treated condition, ultimate tensile strength increases by about 60% without sacrificing much plasticity,which can be attributed to the content of bcc phases and fine precipitates dispersed in the dendrites. For other heattreated conditions, tensile ductility increases by at least30%, especially 60% for heat treatment at 450 ℃, and strength also improves. Fracture analysis indicates that the fracture mode of heat treatment at 850 ℃ is a mixture of quasi-cleavage and ductile fracture, while the other heattreated conditions show the mode of ductile fracture.

关键词： High-entropy alloys Heat treatment Microstructure Tensile properties

Stability Comparison Between Grid-forming and Grid-following Based Wind Farms Integrated MMC-HVDC

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1341-1355页

作者： Rongcai Pan Dong Liu shan Liu Jie Yang Longze kou Guangfu Tang China Electric Power Research Institute Beijing 100192Chinaand he is also with the State Key Laboratory of Advanced Power Transmission Technology and Beijing Key Laboratory of DC Grid Technology&SimulationBeijing 102209China State Key Laboratory of Advanced Power Transmission Technology and Beijing Key Laboratory of DC Grid Technology&Simulation Beijing 102209China

Grid-forming(GFM)control based high-voltage DC(HVDC)systems and renewable energy sources(RESs)provide support for enhancing the stability of power ***,the interaction and coordination of frequency support between the GFM-based modular multilevel converter based HVDC(MMC-HVDC)and grid-following(GFL)based RESs or GFM-based RESs have not been fully investigated,which are examined in this ***,the detailed AC-and DC-side impedances of GFM-based MMC-HVDC are *** impedance characteristics of GFL-and GFM-based wind turbines are next ***,the influences of GFL-and GFM-based wind farms(WFs)on the DC-and AC-side stabilities of WF-integrated MMC-HVDC systems are compared and *** results show that the GFM-based wind turbine performs better than the GFL-based wind ***,to support a receiving-end AC system,the corresponding frequency supporting strategies are proposed based on the GFM control for WF-integrated MMC-HVDC *** GFM-based WF outperforms the GFL-based WF in terms of stability and response *** in PSCAD/EMTDC demonstrate the DC-and AC-side stability issues and seamless grid support from the RESs,i.e.,WFs,to the receiving-end AC system.

关键词： Renewable energy source(RES) modular multilevel converter(MMC) wind farm grid-forming(GFM) highvoltage direct current

A QCD Model Using Generalized Yang-Mills Theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第4期47卷 685-689页

作者： WANG Dian-Fu SONG He-shan kou Li-Na Department of Physics Dalian Maritime University Dalian 116026 China Department of Physics Dalian University of Technology Dalian 116024 China

Generalized Yang-Mills theory has a covariant derivative, which contains both vector and scalar gauge bosons. Based on this theory, we construct a strong interaction model by using the group U（4）. By using this U（4） generalized Yang-Mills model, we also obtain a gauge potential solution, which can be used to explain the asymptotic behavior and color confinement.

关键词： QCD model Yang-Mills theory

Soldering of Zr-based bulk metallic glass and copper by Au-12Ge eutectic alloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第1期38卷 52-58页

作者： Jun Wang Jing Cui Hong-Chao kou Heng Guan Jin-shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Zr-based bulk metallic glass and copper with different surface roughness were soldered using low temperature eutectic Au-12 Ge(wt%) solder on a thermomechanical simulator. The cross-sectional microstructures of the brazed joints were analyzed by scanning electron microscopy(SEM) and transmission electron microscope(TEM) in detail, and the compositional distribution along the interface was analyzed by energy-dispersive spectrometer(EDS). Results show that the surface roughness of base metals plays an important role in the quality of the brazed joint because the surface roughness can enlarge the effective contact area, which can improve the brazing surface quality between two materials. A moderate roughness of treated Zr-based metallic glass of 18 μm is shown to be the best for the soldering, while the surface roughness has a weak effect on the soldering behavior of Au-12 Ge solder on copper. After soldering, long-range diffusion of atoms occurs between the base metal and solder, and five distinct regions are formed at the joint region.

关键词： Bulk metallic glass Soldering Au-Ge eutectic alloy Interface

Solidification microstructure characteristics of Ti–44Al–4Nb–2Cr–0.1B alloy under various cooling rates during mushy zone

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2016年第1期35卷 35-41页

作者： Peng Han Hong-Chao kou Jie-Ren Yang Guang Yang Jin-shan Li The State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Beta-solidifying TiAl alloy has great potential in the field of aero-industry as a cast *** the present work,the influence of cooling rate during mushy zone on solidification behavior of Ti-44Al-4Nb-2Cr-0.1B alloy was investigated.A vacuum induction heating device combining with temperature control system was *** Ti-44Al-4Nb-2Cr-0.1B alloy solidified from superheated was melted to β phase with the cooling rates of 10,50,100,200,400 and 700 K·min^（-1）,*** show that with the increase in cooling rate from 10 to 700 K·min^（-1）,the colony size of α_2/γ lamella decreases from 1513 to48 urn and the solidification segregation significantly *** the content of residual B2 phase within α_2/γlamellar colony decreases with the increase in cooling *** addition,the alloy in local interdendritic regions would solidify in a hypo-peritectic way,which can be attributed to the solute redistribution and enrichment of Al element in solidification.

关键词： β-solidifying TiAl alloy Cooling rate Mushyzone Solidification microstructure

Hot corrosion behavior and mechanical properties degradation of a Ni–Cr–W-based superalloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第1期36卷 23-31页

作者： Ruj-Feng Dong Tie-Bang Zhang Rui Hu Hong-Chao kou Jin-shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

The effect of molten salts on the mechanical properties of a Ni–20Cr–18W(wt%)-based superalloy was investigated in this work. The hot corrosion characteristics and the microstructural evolution during the hot corrosion process were analyzed. The corrosion scale forms on the surface of the substrate, and its thickness increases gradually during the process. The element of S invades the substrate. The corrosion products mainly include Ni O,Ni_3S_2 and Cr_2O_3. The hot corrosion in molten salt makes the specimens rough and flawed. The serration grain boundaries are observed in the hot corroded *** tensile strength and elongation of the original alloy are^1023 MPa and ~15 %, respectively. After corroded for5 h, the tensile strength and elongation of the specimen decrease to ~771 MPa and ~7 % and diminish to^814 MPa and ~9 % for the specimen corroded for 10 *** hot corrosion process deteriorates the mechanical properties of the alloys. And the tensile strength and elongation of the specimen corroded for 20 h sharply decrease to ~539 MPa and ~3 %, respectively. The nonmonotonic variation of the mechanical properties of the specimen occurs for the specimens corroded for 10 h,which is related to the competition between the depredation of the molten salts and the strengthening process by carbides and the serrated grain boundaries.

关键词： Ni-based superalloys Hot corrosion behavior Microstructural evolution Grain boundary Mechanical properties