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CREEp CRACK GROWTH BEHAVIOR OF ALLOy 718 DURING HIGH TEMpERATURE EXpOSURE

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Acta Metallurgica Sinica(English Letters) 2005年第2期18卷 164-172页

作者： J.X.Dong M.C.zhang y.p.Zeng X.S.Xie DepartmentofMaterialScience UniversityofScienceandTechnologyBeijingBeijing100083China

Alloy 718 is a precipitation strengthened nickel-based superalloy based on the precipitation of γ″-Ni3Nb (DO22 structure) and γ′-Ni3(Al,Ti) (L12 structure) phases. Creep crack growth rate (CCGR) was investigated after high temperature exposure at 593, 650 and 677℃ for 2000h in Alloy 718. In addition to the coalescence of γ′/ γ″ and the amount increasing of δ phase, the existence of a bcc chromium enriched α-Cr phase was observed by SEM, and the weight fraction of α-Cr and other phases were determined by chemical phase analysis methods. The CCGR behavior and regulation have been analyzed by means of strength and structure analysis approaches. The experimental results show higher the exposure temperature and longer the exposure time, lower the CCGR. This is probably attributed to the interaction of material softening and brittling due to complex structure changes during high temperature exposure. Therefore, despite α-Cr phase formation and amount enhancement were run in this test range. It seems to us a small amount of α-Cr will be not harmful for creep crack propagation resistance, which is critical for disk application in aircraft and land-based gas turbine.

关键词： Alloy 718 creep crack growth rate α-Cr phase

Influence of Zn Doping on Novel Cathode Material LiFepO_4

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复旦学报（自然科学版） 2005年第5期44卷 877-878页

作者： H. Liu C. Li Q. Cao H.p. zhang y.p. Wu H.Q. Wu Department of Chemistry ＆ Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

The novel cathode material LiFepO4 for lithium ion battery is considered as the substitute of LiCoO2 because of its high theoretical capacity, environmental benignancy and inexpensive cost[1,2]. But it is restricted by its low conductivity, the traditional ways to improve are carbon coating[3,4] and heteroatom doping[5-7].In this paper, we introduced the Zn as heteroatom and investigated the improvement by Zn doping.

关键词： LiFepO4 锂电池电解液阴极电化学

Construction of 2D/2D Ti_(3)C_(2)T_(x)MXene/CdS heterojunction with photothermal effect for efficient photocatalytic hydrogen production

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Journal of Materials Science & Technology 2024年第4期171卷 1-9页

作者： T.y.Huang Z.yang S.y.yang Z.H.Dai y.J.Liu J.H.Liao G.y.Zhong Z.J.Xie y.p.Fang S.S.zhang Key Laboratory for Biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Chemical Engineering and Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semiconductors to visible and infrared light is a key constraint on the utilization of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semiconductor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/CdS heterojunction catalyst is obtained by in-situ epitaxial growth of two-dimensional(2D)CdS nanosheets on 2D MXene interface via a solvothermal *** exceptional light absorption properties of MXene confer outstanding full-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure effectively mitigated the recombination of photogenerated carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃under visible light irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irradiation of visible and near infrared light,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of CdS *** study introduces a novel approach for constructing full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrogen evolution research.

关键词： Two-dimensional structure Heterostructure photothermal effect photocatalyst Hydrogen evolution

Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

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Matter and Radiation at Extremes 2024年第4期9卷 54-67页

作者： Q.K.Liu L.Deng Q.Wang X.zhang F.Q.Meng y.p.Wang y.Q.Gao H.B.Cai S.p.Zhu Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied physics and Computational Mathematics Beijing 100094China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Shanghai Institute of Laser plasma Shanghai 201800China HEDpS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of physics Zhejiang UniversityHangzhou 310027China

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering(BSRS)bursts using particle-in-cell *** bursts occur during the nonlinear stage,causing reflectivity spikes and generating large numbers of hot ***-duration simulations are performed to observe burst events,and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity *** the simplified model,we isolate and characterize the spectrum of electron plasma *** spectrum changes from a sideband structure to a turbulence-like structure during the burst.A significant asymmetry in the spectrum is *** asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses,leading to violent vortex-merging and generation of hot *** proportion of hot electrons increases from 6.76%to 14.7%during a single violent burst *** demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

关键词： scattering kinetic simplified

The Effect of Titania-coating on Electrochemical Characteristics of CMS in pC-Based Electrolyte

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复旦学报（自然科学版） 2005年第5期44卷 857-858页

作者： J. Cao L.C. yang T. zhang y.p. Wu H.Q. Wu Deparment of Chemistry ＆ Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

Lithium-ion batteries have been widely used in portable electronic devices due to their high voltage and high energy density. Most research has concentrated on improving their performance such as capacity, cycling characteristics and low temperature range. propylene carbonate (pC)-based electrolytes are more desirable than ethylene carbonate (EC)-based electrolytes because of their low-temperature characteristics[1]. Unfortunately, pC is not used in commercial lithium-ion batteries because solvent decomposition and graphite exfoliation occur when lithium intercalates[2].

关键词：锂离子电池二氧化钛丙烯碳酸盐溶胶凝胶体电化学

LASER LIFT-OFF OF GaN THIN FILMS FROM SAppHIRE SUBSTRATES

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 448-452页

作者： J. Xu, R. zhang, y.p. Wang, X.Q. Xiu, S.L. Gu, B. Shen, y. Shi, Z.G. Liu and y.D. Zheng (Department of physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China) Department of physics and National Laboratory of Solid State Microstructures Nanjing University

Gallium Nitride film was successfully separated from sapphire substrate by laser radiation. The absorption of the 248 nm radiation by the GaN at the interface results in rapid thermal decomposition of interfacial layer, yielding metallic Ga and N2 gas. The substrate can be easily removed by heating above the Ga melting point (29°C). X-ray diffraction, atomic force microscopy and photoluminescence of GaN before and after lift-off process have been performed, which demonstrated that the separation and transfer process do not alter the structural quality of the GaN films. And further discussions on the threshold energy and crack-free strategies of laser lift-off process have also been presented.

关键词： Gallium compounds Laser beam effects Nitrides Sapphire Separation

Novel umami peptides from two Termitomyces mushrooms and molecular docking to the taste receptor T1R1/T1R3

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Food Science and Human Wellness 2024年第2期13卷 1055-1064页

作者： Lanyun zhang Li zhang Jesus pérez-Moreno Lu Bin Fengming zhang Fuqiang yu The Germplasm Bank of Wild Species Yunnan Key Laboratory for Fungal Diversity and Green DevelopmentKunming Institute of BotanyChinese Academy of SciencesKunming 650201China College of Chemical Science and Technology Yunnan UniversityKunming 650091China College of Food Science and Technology Yunnan Agricultural UniversityKunming 650201China Colegio postgraduados Campus MontecilloEdafologíaTexcoco 56230México Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China Southwest Forestry UniversityKunming 650224China

Wild edible Termitomyces mushrooms are popular in Southwest China and umami is important flavor qualities of edible *** study aimed to understand the umami taste of Termitomyces intermedius and Termitomyces *** umami peptides from aqueous extracts were separated using a Sephadex G-15 gel filtration *** intense umami fraction was evaluated by both sensory evaluation and electronic *** were identified as KLNDAQApK,DSTDEKFLR,VGKGAHLSGEH,MLKKKKLA,SLGFGGppGy,TVATFSSSTKpDD,AMDDDEADLLLLAM,VEDEDEKpKEK,SpEEKKEEET and *** peptides,except VEDEDEKpKEK,SpEEKKEEET and pEGADKpNK were selectively synthesized to verify their taste *** these 10 peptides had umami or salt *** 10 peptides were conducted by molecular docking to study their interaction with identified peptides and the umami taste receptor T1R1/*** these 10 peptides perfectly docked the active residues in the T1R3 *** results provide theoretical basis for the umami taste and address the umami mechanism of two wild edible Termitomyces mushrooms.

关键词： Termitomyces Non-volatile flavor compounds Umami peptides Taste characteristics Molecular docking

A functional gel polymer electrolyte based on pVDF-HFp/gelatin toward dendrite-free lithium metal batteries

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Nano Research 2024年第4期17卷 2790-2799页

作者： Xiaoyi Hu Kangli Liu Shijie zhang Guosheng Shao S.Ravi p.Silva peng zhang State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) ZhongyuanzhiguXingyang 450100China Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordGU27XHUK

The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries(LMBs).The appearance of gel polymer electrolyte(GpE)has obviously improved the safety of traditional ***,the limited inhibition of GpE on lithium dendrites is detrimental to the safety of ***,a kind of poly(vinylidene fluoride-co-hexafluoropropylene)(pVDF-HFp)/gelatin(GN)GpE with high ionic conductivity,high-temperature resistance,and flame-retardancy,was prepared by electrospinning and soaking *** the electrospinning network of pVDF-HFp,its affinity to liquid electrolytes,makes this GpE more beneficial to ions transport and the formation of ***,the GN with sol–gel properties,enhances the mechanical property(13.5 Mpa)of HFp-GN ***,X-ray photoelectron spectroscopy(XpS)and density functional theory(DFT)suggest that the attraction of polar groups of GN to Li+can regulate the distribution of Li+and protect Li ***,the application of HFp-GN GpEs to LMBs with cathodes of LiFepO_(4) and LiCoO_(2) deliver excellent electrochemical performances:after 300 cycles,the LiFepO_(4)/HFp-GN GpE/Li battery keeps a low capacity decay rate of 0.09%at 5 C;after 400 cycles at 2 C,the LiCoO_(2)/HFp-GN GpE/Li cell retains a high capacity retention of 74%.This GpE is demonstrated for the application prospect of safe LMBs.

关键词： poly(vinylidene fluoride-co-hexafluoropropylene)(pVDF-HFp) gelatin polar groups lithium metal battery lithium dendrite

Quantification of CO2 Emissions from Three power plants in China Using OCO-3 Satellite Measurements

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Advances in Atmospheric Sciences 2024年第11期41卷 2276-2288页

作者： yang y. Zhou M. Wang W. Ning Z. zhang F. Wang p. College of Data Science Jiaxing University Jiaxing 314000 China LAGEO Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shanghai Ecological Forecasting and Remote Sensing Center Shanghai 200030 China CNRC Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Key Laboratory of Atmospheric Environment and Extreme Meteorology Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of Atmospheric and Oceanic Sciences / Institute of Atmospheric Sciences Fudan University Shanghai 200082 China

Coal-fired power plants are a major carbon source in China. In order to assess the evaluation of China’s carbon reduction progress with the promise made on the paris Agreement, it is crucial to monitor the carbon flux intensity from coal-fired power plants. previous studies have calculated CO2 emissions from point sources based on Orbiting Carbon Observatory-2 and -3 (OCO-2 and OCO-3) satellite measurements, but the factors affecting CO2 flux estimations are uncertain. In this study, we employ a Gaussian plume Model to estimate CO2 emissions from three power plants in China based on OCO-3 XCO2 measurements. Moreover, flux uncertainties resulting from wind information, background values, satellite CO2 measurements, and atmospheric stability are discussed. This study highlights the CO2 flux uncertainty derived from the satellite measurements. Finally, satellite-based CO2 emission estimates are compared to bottom-up inventories. The satellite-based CO2 emission estimates at the Tuoketuo and Nongliushi power plants are ∼30 and ∼10 kt d−1 smaller than the Open-Data Inventory for Anthropogenic Carbon dioxide (ODIAC) respectively, but ∼10 kt d−1 larger than the ODIAC at Baotou. © Institute of Atmospheric physics/Chinese Academy of Sciences, and Science press 2024.

关键词： CO2 emission Gaussian plume Model OCO-3 power plant