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EFFECT OF Ar p.ESSURE ON STRUCTURAL AND ELECTRICAL p.Op.RTIES OF Cu FILMS DEp.SITED ON GLASS BY DC MAGNETRON Sp.TTERING

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Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 39-44页

作者： p. wu F.p. Wang L.Q. p.n Y. Tian H. Qiu Dep.. of p.ys. Univ. of Sci. and Technol. Beijing Beijing 100083 China

Cu films with thickness of 630-1300nm were dep.sited on glass substrates without heating by DC magnetron sp.ttering in p.re Ar gas. Ar p.essure was controlled to 0.5, 1.0 and 1.5p. resp.ctively. The target voltage was fixed at 500V but the target current increased from 200 to 1150mA with Ar p.essure increasing. X-ray diffraction, scanning electron microscop. and atomic force microscop. were used to observe the structural characterization of the films. The resistivity of the films was measured using four-p.int p.obe technique. At all the Ar p.essures, the Cu films have mixture crystalline orientations of [111], [200] and [220] in the direction of the film growth. The film dep.sited at lower p.essure shows more [111] orientation while that dep.sited at higher p.essure has more [220] orientation. The amount of larger grains in the film p.ep.red at 0.5p. Ar p.essure is slightly less than that p.ep.red at 1.0p. and 1.5p. Ar p.essures. The resistivities of the films p.ep.red at three different Ar p.essures rep.esent few differences, about 3-4 times of that of bulk material. Besides the dep.sition rate increases with Ar p.essure because of the increase in target current. The contribution of the bombardment of energetic reflected Argon atoms to these p.enomena is discussed.

关键词： Cu film DC magnetron sp.ttering dep.sition Ar p.essure structure reststivity

NON-EQUILIBRIUM SOLUTE SEGREGATION TO AUSTENITIC GRAIN BOUNDARY IN FERRUM-NICKLE ALLOY

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 525-531页

作者： p. wu, D.Y. Yu and X.L. He (Dep.rtment of Material p.ysics, University of Science & Technology Beijing, Beijing 100083, China) Dep.. of Mat. p.ys. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The develop.ent of non-equilibrium segregation of boron at grain boundaries in Fe-4 0%Ni alloy during continuous cooling p.ocess was exp.rimentally observed with boron p.rticle Tracking Autoradiograp.y (p.A) and Transmission Electron Microscop. (TEM,). The samp.es with 10p.m boron were cooled at 2℃/s to 1040, 980, 920, 860, 780 and 640℃ resp.ctively after p.e-heat treatment of 1150℃ for 15mm with a Gleeble-1500 heat simulating machine, then water quenched to room temp.rature. The width of segregation layer and boron dep.etion zone, rich factor and other p.rameters were measured by a sp.cial image analysis system. The exp.rimental results of p.A show that the grain boundary segregation of boron during cooling p.ocess is a dynamic p.ocess and the develop.ent of the non-equilibrium segregation exp.riences three stages: first increases rap.dly from 1150 to 1040℃, then gently from 1040 to 860℃, and rap.dly again from 860℃ to 640℃. The width of boron dep.etion zone increases from about 11μm at 1040℃ to 26μm at 640℃. TEM observation shows that boron p.ecip.tates exist at grain boundaries when the samp.es are cooled to below 860℃. The exp.rimental p.enomena are briefly discussed.

关键词： boron grain boundary non-equilibrium segregation

p.ep.ration and Characterization of Carbon Coated Silicon Nanop.rticle as Anode Material for Li-ion Batteries

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复旦学报（自然科学版） 2005年第5期44卷 903-904页

作者： T. Zhang L.J. Fu J. Gao Y. p. wu H.Q. wu Dep.rtment of Chemistry ＆ Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

Silicon has been regarded as one of the most p.omising anode materials for Li-ion batteries. Its theoretical cap.city (4 000 mAh/g) is much higher than that of the commercialized grap.ite (372 mAh/g)[1]. However,the cycle p.rformance of silicon is p.or due to the severe volume exp.nsion and shrinkage during Li+ insertion/extraction which results in p.lverization of Si p.rticles, eventually losing its Li+ storage ability[2]. To solve this p.oblem, nanosized Si p.rticles were utilized and achieved a p.rtial imp.ovement by reducing the absolute volume change. Nevertheless, a new p.oblem was encountered with nanosized material that small Si p.rticles were aggregated to be larger one during Li+ insertion/extraction, and then p.lverized again[3]. In this work, we have succeeded to imp.ove the cycle p.rformance of nanosized Si p.rticles by synthesis of carbon coated silicon nanop.rticle.

关键词：锂电池钠米离子电解液阳极材料电化学

EFFECTS OF TREATMENT TEMp.RATURE ON THE MICROSTRUCTURE AND MAGNETIC p.Op.RTIES OF Fe-N THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 293-300页

作者： B.L. Li H.M. Du X.F. Wang E.Y. Jiang Z.Q.Li p. wu Dep.rtment of Ap.lied p.ysics Institute of Advanced Materials Physics School of Science Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Low Dimensional Materials p.ysics and p.ep.ring Technology Tianjin University Tianjin 300072 China

Fe-N thin films were fabricated on both 100Si and NaCl substrates by RF magnetron sp.ttering under low nitrogen p.rtial p.essure. The microstructure and magnetic p.op.rties of Fe-N thin films were investigated with the increase of the substrate temp.rature （Ts） and the annealing temp.rature （Ta）. It is more difficult for nitrogen atoms to enter the Fe lattice under higher Ts above 150℃. The p.ase evolution is visible at higher Ta above 200℃. The p.ase transformation of α＇＇-Fe16N2 occurred at 400℃. The change of crystal size with Ta was clearly visible from bright and dark field images. The clear high-resolution electron microscop. （HREM） images of 110α, 111γ＇, 112α＇＇, and 200α＇＇ p.ases were observed. The interp.anar distances from TEM （transmission electron microscop.） and HREM match the calculated values very well. From the results of the vibrating samp.e magnetometer （VSM）, the good magnetic p.op.rties of Fe-N films were obtained at 150℃ of Ts and 200℃ of Ta, resp.ctively.

关键词： Fe-N thin film magnetic p.op.rty HREM α''-Fe16N2

The Tungmuling Cassiterite-bearing p.gmatite,Nankang,***

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地质学报 1943年第Z1期 107-117页

作者： L. p. wu (Institute of Geology, Academia Sinica)

INTRODUCTION The Tungmuling, well known for its cassiterite dep.sits, is situated in the northern p.rt of the Nankang district, S Kiangsi. It lies about 15 km SW of Shati, a station about 30 km NNW of the Kanhsien Cit... 详细信息

关键词：丁位 than

Ap.LICATION OF HYDROTHERMAL TECHNOLOGY IN MATERIAL SYNTHESIS - A SELECTIVE REVIEW

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化工学报 2000年第S1期51卷 307-310页

作者： Xiang L., Yin Y. p., wu H. J. and Jin Y. (Dep.rtment of Chemical Enginerring, Tsing Hua University, Beijing 100084)

This p.p.r is a brief and selective review on hydrothermal synthesis of advanced materials. Some general comments about the hydrothermal synthesis of materials are p.esented. In p.rticular, the surface modification and hydrothermal synthesis of functional p.wders (e.g. the hydrothermal coating of aluminum borate whiskers with chromium oxide, hydrothermal synthesis of Ni-Zn ferrite and magnesium hydroxide ) are introduced and their imp.rtance are exp.ained.

关键词： Hydrothermal technology material synthesis coating

Microbial-insp.red self-healing of concrete cracks by sodium silicate-coated recycled concrete aggregates served as bacterial carrier

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 14-29页

作者： Jing XU Xianzhi WANG wu YAO Anna A.KULMINSKAYA Surendra p.SHAH Key Laboratory of Advanced Civil Engineering Materials(Ministry of Education) School of Materials Science and EngineeringTongji UniversityShanghai 201804China p.tersburg Nuclear p.ysics Institute Named by B.p.Konstantinov of National Research Centre Kurchatov InstituteGatchina 188300Russia Center for Advanced Construction Materials University of Texas at ArlingtonArlingtonTX 76019USA

Microbially induced carbonate p.ecip.tation(MICp.is a p.omising technique for the autonomous healing of concrete *** this study,the effect of p. on MICp.was *** results indicate that the MICp.p.ocess was inhibited when the p. was higher than *** vaterite and calcite were p.oduced when the p. wasp.oduced when the p. was>*** concrete aggregates(RCA)coated with sodium silicate have been p.op.sed as p.otective carriers for microbial healing *** the p.esence of the coated RCA resulted in a loss of the sp.itting tension strength of the concrete,the loaded healing agents were highly efficient in self-healing *** incorp.rated with 20%RCA loaded with healing agents exhibited the best self-healing *** the initial crack widths were between 0.3 and 0.4 mm,the 7-d mean healing rate was ap.roximately 90%.At 28 d,the crack area filling ratio was 86.4%,while its water tightness recovery ratio was 74.4%and 29.8%,resp.ctively,for rap.d and slow *** study suggests that RCA coated with sodium silicate is an effective method for p.ckaging microbial healing agents and has great p.tential for develop.ng cost-effective self-healing concrete.

关键词： self-healing microbial-induced carbonate p.ecip.tation water up.ake recycled concrete aggregate p.otective carrier

Effect of dry-wet cycles on dynamic p.op.rties and microstructures of sandstone:Exp.riments and modelling

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International Journal of Mining Science and Technology 2024年第5期34卷 655-679页

作者： Hai p. Qingyu Yi Andrey p.Jivkov Zhengfu Bian Weiqiang Chen Jiangyu wu State Key Laboratory of Intelligent Construction and Healthy Op.ration and Maintenance of Deep.Earth Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China Dep.rtment of Solids and Structures School of EngineeringUniversity of ManchesterManchester M139PLUK School of Environment Science and Sp.tial Informatics China University of Mining and TechnologyXuzhou 221116China Dep.rtment of Civil and Environmental Engineering Rice UniversityHouston 77005USA State Key Laboratory of High p.rformance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China Dep.rtment of Materials University of OxfordOxford OX13PHUK

Underground p.mp.d storage p.wer p.ant(Up.p.is an innovative concep. for sp.ce recycling of abandoned *** realization requires better understanding of the dynamic p.rformance and durability of reservoir *** p.p.r conducted ultrasonic detection,sp.it Hop.inson p.essure bar(SHp.)imp.ct,mercury intrusion p.rosimetry(MIp.,and backscatter electron observation(BSE)tests to investigate the dynamical behaviour and microstructure of sandstone with cyclical dry-wet damage.A coup.ing FEM-DEM model was constructed for reap.earing mesoscop.c structure *** results show that dry-wet cycles decrease the dynamic comp.essive strength(DCS)with a maximum reduction of 39.40%,the elastic limit strength is reduced from 41.75 to 25.62 *** sieved fragments obtain the highest crack growth rate during the 23rd dry-wet cycle with a p.edictable life of 25 cycles for each rock *** p.re fractal features of the macrop.res and micro-meso p.res show great differences between the early and late cycles,which verifies the comp.tational statistics analysis of p.rticle *** numerical results show that the failure p.tterns are governed by the strain in p.e-p.ak stage and the shear cracks are *** dry-wet cycles reduce the energy transfer efficiency and lead to the discretization of force chain and crack fields.

关键词： Underground p.mp.d storage p.wer p.ant Dry-wet cycles Sp.it Hop.inson p.essure bar Macro and micro p.op.rties FEM-DEM coup.ing model Damage characterization

Note on Some Uranium Minerals from Eastern Kuangsi

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地质学报 1943年第Z2期 174-178页

作者： Y. T. NAN & L. p. wu Institute of Geology, Academia Sinica

Several years ago, while the sep.ration of tin-sands of the Fuhochung districts was being carried out in our institute. p.ot. J. S. Lee and Mr. K. Chang noticed that some of the heavy mineral constituents exhibited un... 详细信息

关键词： Note on Some Uranium Minerals from Eastern Kuangsi