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Correlation of Magnetic Properties of Co/Cr Bilayer Thin Films with Grain Boundary Diffusion

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Journal of Materials Science & Technology 2009年第6期25卷 789-794页

作者： Gaowu Qin Bo Yang Wenli pei Yuping ren Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110004 China

The microstructure and magnetic properties of Co/Cr bilayer films were examined before and after postdeposition annealing by using transmission electron microscopy （TEM）, X-ray diffraction （XRD） technique and vibrating sample magnetometer （VSM）. A model of grain boundary （GB） Cr-rich phase growth involving GB diffusion derived from the Cr underlayer was proposed to elucidate the kinetics of the paramagnetic Cr-rich phase growth along Co GBs within the Co layer. The correlation of the GB Cr-rich phase formation with the magnetic Co grain isolation and accordingly, improvement of magnetic properties was experimentally investigated and discussed in detail. Our analysis results are well consistent with previous micromagnetic simulations on the improvement of magnetic properties by the magnetic grain isolation. The results provide some insights into the processing-structure-property relationships of the Co/Cr bilayer films, and thus suggest that the magnetic grain isolation be feasible not only in longitudinal recording media, but also be effective in tuning the exchange coupling of magnetic grains in perpendicular recording media via the GB diffusion from underlayer and/or overlayer.

关键词： Magnetic recording media Grain boundary diffusion Magnetic isolation Co/Cr thin films

Effect of rapid quenching on the microstructure and electrochemical characteristics of La_(0.6)Ce_(0.4)Ni_(3.6)Co_(0.65)Mn_(0.4)Al_(0.2)Ti_(0.05_(FeB)_(0.1) hydrogen storage alloy

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Rare Metals 2010年第6期29卷 593-596页

作者： ZHANG peilong SONG Xiping WANG Xiuli pei pei LUO Guiping tu Jiangping CHEN Guoliang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 000China Whole Win(Beijing) Materials Sci.& Tech.Co. Ltd.Beijing 100083China Department of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

In order to improve the cycling stability of AB5 type alloy electrodes,rapid quenching technology and new alloy composition design were employed.A hydrogen storage alloy with nominal composition La0.6Ce0.4Ni3.6Co0.65Mn0.4Al0.2Ti0.05（FeB）0.1 was prepared by vacuum magnetic levitation melting under high purity argon atmosphere,followed by rapid quenching at different cooling *** results show that all alloys exhibit the single-phase CaCu5-type *** tests indicate that rapid quenching can slightly improve the cycling life of the ***,the high-rate dischargeability of the quenched alloys is lower than that of the as-cast alloy.

关键词： hydrogen storage alloys electrochemical properties rapid quenching microstructure

Energy-limiting factor for coal and gas outburst occurrence in intact coal seam

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International Journal of Mining Science and Technology 2021年第4期31卷 729-742页

作者： Qingyi tu Yuanping Cheng Sheng Xue Ting ren Xiang Cheng State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Faculty of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Civil Mining&Environmental EngineeringUniversity of WollongongNSW 2522Australia

This research reviewed the mechanics and gas desorption properties of intact coal,and tested the crushing work ratios of different intact coals,and then,studied the stress conditions for the failure or crushing of intact coal and the gas demand for the pulverization of intact coal *** a real-life outburst case is examined,the required minimum stress for intact coal outburst is *** study concludes that the crushing work ratios of three intact coal samples vary from 294.3732 to 945.8048 J/m^(2).For the real-life case,more than 2300 MJ of transport work is needed,and 10062.09,7046.57 and 5895.47 m^(3) of gas is required when the gas pressure is 1,2 and 3 MPa,*** crushing work exceeds the transport work and even reaches 13.96 times of the transport *** to provide such an enormous crushing work is an energy-limiting factor for the outburst in intact *** strain energy is needed for the crushing work,and the required minimum stress is over 54.35 MPa,even reaching 300.44 *** minimum stresses far exceed the in-situ vertical and horizontal stresses that can be provided at the 300–700 m mining depth range.

关键词： Coal and gas outburst Intact coal Crushing work ratio Geological factors Outburst energy

Cross-Coupling of Secondary Amides with Tertiary Amides: The Use of Tertiary Amides as Surrogates of Alkyl Carbanions for Ketone Synthesis

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Chinese Journal of Chemistry 2019年第9期37卷 887-891页

作者： Shu-ren Wang pei-Qiang Huang Department of Chemistry Fujian Provincial Key Laboratory of Chemical BiologyCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China

In recent years,exciting progress has been made in the field of direct transformation of amides,nevertheless,the condensation between two amides remains rare and restricted to homo-coupling ***,we report the cross-coupling of secondary amides with tertiary amides,which provides a synthesis of ketones under mild conditions,and features the use of tertiary amides as surrogates of alkyl *** method relies on the coupling of enamines,generated from tertiary amides by catalytic partial reduction of tertiary amides with Vaska's catalyst,with nitrilium ions,formed in situ from secondary amides via activation with trifluoromethanesulfonic anhydride,and on the subsequent deformylation.

关键词： Secondary Amides Tertiary Amides Alkyl Carbanions

Achieving High Strength-plasticity of Nanoscale Lamellar Grain Extracted from Gradient Lamellar Nickel

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 67-78页

作者： Zimeng Wang Yunfei Jia Yong Zhang pei Tang Xiancheng Zhang Shantung tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Traditional metallic materials usually face a dilemma between high strength and poor strain hardening ***,heterogeneous structured metallic materials have been found to obviously overcome the ***,gradient lamellar structure was fabricated through ultrasound-aided deep rolling technique in pure Ni with high stacking fault energy after heat *** gradient lamellar Ni was successively divided into the four ***-situ micropillar compression tests were conducted in diferent regions to reveal the corresponding microscopic mechanical *** characterization techniques were performed to explore underlying deformation mechanisms and the efects of microstructural parameters on deformation *** work demonstrates that the micropillar with near nanoscale lamellar thickness possesses excellent strength and *** one hand,the reason for high strength of near nanoscale micropillar is that the strength of micropillar increases with the decrease of lamellar thickness according to the Hall-Petch *** the other hand,numerous lamellar grain boundaries perpendicular to the loading direction is found to hinder the motion of slip bands,resulting in great strain hardening capacity in the near nanoscale lamellar micropillar.

关键词： Nanoscale lamellar structure Compression test Slip Dislocation

An integrated MINLP model for multi-party coordination in downstream oil supply chain

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Petroleum Science 2024年第3期21卷 2066-2079页

作者： Rui Qiu Bo Zhang Wei Zhao ren-Fu tu Man-Qiu He Qi Liao Yong-tu Liang National Engineering Laboratory for Pipeline Safety/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum-BeijingFuxue Road No.18Changping DistrictBeijing102249PR China Strategy&Implementation Department PipeChinaDongtucheng Road No.5Chaoyang DistrictBeijing100013PR China

Cooperation among enterprises can bring overall and individual performance improvement,and a smooth coordination method is ***,due to the lack of customized coordination methods,cooperation in the downstream oil supply chain cannot be carried out *** paper intends to propose a multi-party coordination method to promote cooperation between oil shippers and pipeline operator by optimizing oil transportation,oil substitution and pipeline pricing *** integrated game-theoretic modeling and analysis approach is developed to characterize the operation behaviors of all stakeholders in the downstream oil supply *** proposed mixed integer nonlinear programming model constrains supply and demand capacity,transportation routes,oil substitution rules and pipeline freight *** transformation and price discretization are introduced for model linear *** experiments are carried out in the oil distribution system in South *** results show that compared to the business-as-usual scheme,the new scheme saves transportation cost by 3.48%,increases pipeline turnover by 5.7%,and reduces energy consumption and emissions by 7.66%and 6.77%.It is proved that the proposed method improves the revenue of the whole system,achieves fair revenue distribution,and also improves the energy and environmental benefits of the oil supply chain.

关键词： Downstreamoil supplychain Multi-partycoordination Cooperative game Mixed integernonlinear programming model Pipeline transportation Revenue distribution

Thermochromic Silks for Temperature Management and Dynamic Textile Displays

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Nano-Micro Letters 2021年第5期13卷 17-33页

作者： Yang Wang Jing ren Chao Ye Ying pei Shengjie Ling School of Physical Science and Technology ShanghaiTech University393 Middle Huaxia RoadShanghai 201210People’s Republic of China School of Materials Science and Engineering Zhengzhou UniversityZhengzhouPeople’s Republic of China

Silks have various advantages compared with synthetic polymer fibers,such as sustainability,mechanical properties,luster,as well as air and humidity ***,the functionalization of silks has not yet been fully *** techniques that retain or even improve the sustainability of silk production are *** this end,a low-cost,effective,and scalable strategy to produce TCSs by integrating yarn-spinning and continuous dip coating technique is developed *** with extremely long length(>10 km),high mechanical performance(strength of 443.1 MPa,toughness of 56.0 MJ m−3,comparable with natural cocoon silk),and good interfacial bonding were *** can be automatically woven into arbitrary fabrics,which feature super-hydrophobicity as well as rapid and programmable thermochromic responses with good cyclic performance:the response speed reached to one second and remained stable after hundreds of ***,applications of TCS fabrics in temperature management and dynamic textile displays are demonstrated,confirming their application potential in smart textiles,wearable devices,flexible displays,and human–machine ***,combination of the fabrication and the demonstrated applications is expected to bridge the gap between lab research and industry and accelerate the commercialization of TCSs.

关键词： Silk Thermochromic Smart textile Dynamic display

THERMAL　DECOMPOSITION　BEHAVIOUR　OF　NAtuRAL　BASTNASITE　CRYSTAL　IN　CALCINATION

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中国有色金属学会会刊：英文版 1994年第4期4卷 34-38页

作者： Xiang, Jun Zhang, Chengxiang tu, Ganfeng ren, Chengzhi Northeastern Univ Shenyang China

ＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＢＥＨＡＶＩＯＵＲＯＦＮＡＴＵＲＡＬＢＡＳＴＮＡＳＩＴＥＣＲＹＳＴＡＬＩＮＣＡＬＣＩＮＡＴＩＯＮ￥Ｘｉａｎｇ，Ｊｕｎ；Ｚｈａｎｇ，Ｃｈｅｎｇｘｉａｎｇ；Ｔｕ，Ｇａｎｆｅｎｇ；Ｒ... 详细信息

ＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＢＥＨＡＶＩＯＵＲＯＦＮＡＴＵＲＡＬＢＡＳＴＮＡＳＩＴＥＣＲＹＳＴＡＬＩＮＣＡＬＣＩＮＡＴＩＯＮ￥Ｘｉａｎｇ，Ｊｕｎ；Ｚｈａｎｇ，Ｃｈｅｎｇｘｉａｎｇ；Ｔｕ，Ｇａｎｆｅｎｇ；Ｒｅｎ，Ｃｈｅｎｇｚｈｉ（Ｄｅｐａｒ...

关键词： bastnasite calcination thermal dynamic calculation

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Thermal transformation of δ-MnO_2 nanoflowers studied by in-situ TEM

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Science China Chemistry 2012年第11期55卷 2346-2352页

作者： SUN YuGang LIU YuZi TRUONG tu T ren Yang Centerfor Nanoscale Materials Argonne National Laboratory 9700 South Cass Avenue Argonne Illinois 60439 US X-Ray Science Division Argonne National Laboratory 9700 South Cass Avenue Argonne Illinois 60439 US

ln-situ transmission electron microscopy in combination with a heating stage has been employed to real-time monitor varia- tions of δ-phase MnO2 nanoflowers in terms of their morphology and crystalline structures upon thermal annealing at elevated temperatures up to -665 ℃. High-temperature annealing drives the diffusion of the small δ-MnO2 nanocrystallites within short distances less than 15 nm and the fusion of the adjacent δ-MnO： nanocrystallites, leading to the formation of larger crystalline domains including highly crystalline nanorods. The annealed nanoflowers remain their overall flower-like morphology while they are converted to α-MnO2. The preferred transformation of the δ-MnO2 to the α-MnO2 can be ascribed to the close lattice spacing of most crystalline lattices between δ-MnO2 and α-MnO2, that might lead to a possible epitaxial growth of ct-MnO2 lattices on the 8-MnO2 lattices during the thermal annealing process.

关键词： δ-MnO2 nanoflowers α-MnO2 thermal annealing in-situ TEM mechanism study