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Pb isotope geochemistry of lead, zinc, gold and silver deposit clustered region, Liaodong rift zone,northeastern{2.

science china Earth sciences 2005年第4期48卷 467-476页

作者： CheN Jiangfeng1, YU Gang1, XUE Chunji2. QIAN Hui1, he Jianfeng1, XING Zhi1 & ZHANG Xun1 1. {2. of Earth and Space sciences, university of science and technology of china, hefei 2.002., china 2. Department of Geology, Chang’an university, Xi’an 710054, china school of Earth and Space sciences University of Science and Technology of China Hefei China Department of Geology Chang’an University Xi’an China

Pb isotopic analyses were reported for sulfide and hydrothermal carbonate minerals and marble of the Xiquegou lead-zinc, the Zhenzigou zinc-lead and the Gaojiapuzi silver deposits from the Qingchengzi ore field and the Beiwagou zinc-lead deposit in the west, Proterozoic Liaodong rift zone. Pb isotopic ratios of the marble from the Qingchengzi ore field range from 18.2. to 30.63 for 2.6 Pb/2.4Pb, 15.59 to 17.05 for2.7Pb/2.4Pb and 37.43 to 38.63 for 2.8Pb/2.4Pb. The marble gives a Pb-Pb isochron age of 182.±92.Ma, which is interpreted as the age of the metamorphism of the marble. Ore Pb, including Pb of sulfide and hydrothermal car- bonate minerals, from the Qingchengzi ore field shows limited variation with 2.6 Pb/2.4Pb=17.66- 17.96, 2.7 Pb/2.4Pb=15.60-15.74 and 2.8Pb/2.4Pb=37.94-38.60. In contrast, ore Pb from the Beiwagou deposit gives different Pb isotopic ratios with 2.6Pb/2.4Pb=15.68-15.81, 2.7 Pb/2.4Pb= 15.34-15.45 and 2.8Pb/2.4Pb=35.30-35.68. Pb of all deposits from the Liaodong rift zone is derived from the upper crust. Ore Pb of the Qingchengzi deposits is derived from a young upper crust. The model Th/U ratios of 4.40 to 4.74 for ore Pb are significantly different from that of 1.7 to 4.4 given by the marble of the Qingchengzi ore field, suggesting that marble is not the source of the ore Pb. Ore Pb of the Beiwagou deposit is extracted from its source and the deposit is formed at the Paleoproterozoic era. Different Pb isotopic ratios of the Qingchengzi ore field and the Beiwagou deposit are due to different ages of the deposits and suggest that the two types of deposits are derived from different sources and are possibly formed by different ore-forming processes.

关键词： Pb isotopes, source(s) of the ore-forming materials, origin of ore deposits, Liaodong rift zone.

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EFFECT OF UNEQUAL DEFORMATION IN DEVELOPMENT OF ADVANCED PLASTIC PROCESSING TECHNOLOGIES

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Chinese Journal of Mechanical Engineering 2002年第1期15卷 79-82页

作者： Yang he Xian Feijun College of materials {2. and Engineering，Northwestern Polytechnical university，Xi’an 710072.china College of materials science and Engineering Northwestern Polytechnical University Xi'an 710072

An effect of unequal deformation in development of advanced plasticprocessing technologies is researched by studying an in-plane bending process of strip metal underunequal compressing. The research results show the following: If appropriately controlled, unequalplastic deformation can play an important role not only in the improvement of quality of partsobtained by plastic processing technologies, but also in the development of new processes foradvanced plastic working technologies. A coordinated growth of unequal plastic deformation candevelop the deformation potentiality of material to the fall. The degree of unequal plasticdeformation can be used as bases for optimization design of processes and dies of plastic forming.

关键词： Unequal plastic deformation In-plane bending Net shape process Computer simulation Advanced manufacturing technology

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Fabrication of sub-micro size PZT array and their ferroelectric properties

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science china(Technological sciences) 2006年第6期49卷 693-700页

作者： ZHAO Gaoyang1, ZHANG Weihua1, XU Guomin1, DENG Xiaocui1, JIANG Bailing1 & ZHAO Wei2.1. school of materials {2. and Engineering, Xi’an university of technology, Xi’an 710048, china 2. Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710048, china school of materials {2. and Engineering Xi’an University of Technology Xi’an China Xi’an Institute of Optics and Precision Mechanics of CAS Xi’an China

The photosensitive PZT sols and their gel films were prepared by sol-gel process. Based on the photosensitivity of the PZT gel films, two-dimensional (2.) array of the PZT gel film was fabricated using twice-exposure of double-beam interference on the gel film. PZT gel films coated on ITO/quartz substrate were exposed to an interference fringe of 32. he-Cd laser beams, the substrate was rotated by 90° between the first and second irradiation steps. Island type periodic 2. array structures with a pitch of 1 μm and cell size of about 480 nm × 480 nm × 40 nm were formed after the irradiation, and followed by leaching with organic solvent, and then by heat treatment at 600°C for 15 min. The hysteresis loops of the cell in PZT array were in-situ measured by the online-operation of TF analyzer and atomic force microscope (AFM). The probe can be located on the locked cell of PZT array in the AFM image. The alternating voltage applied to the locked cell is supplied by the TF analyzer through the conductive coating probe, and then the test signal is fed back to the TF analyzer to obtain the hysteresis loop of the locked cell of array in the absence of top electrode. The results show that the sub-micro size PZT arrays prepared in this way are of polarization reversal characteristics with the alternating electric fields, thereby exhibiting obvious ferroelectricity.

关键词： PZT, ferroelectric films, photosensitivity, hysteresis loop.

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Computer Simulation of the Continuous Annealing Recrystallization for Cold-Rolled Strip in Galvanizing Line

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Journal of Shanghai Jiaotong university(science) 2011年第3期16卷 352-355页

作者：贺俊光文九巴周旭东李旭东 school of materials {2. and Engineering henan university of {2. and technology school of materials {2. and Engineering Lanzhou University of Technology school of materials {2. and Engineering Lanzhou university of technology

The continuous heating transformation program is developed to investigate the influence of continuous annealing technological parameters on recrystalization for cold-rolled strip in galvanizing *** program can be used for the calculation of the continuous annealing temperature field of strip steel,determination of the start and end time of recrystallization in continuous heating process,and procurement of the continuous heating transformation *** temperature field for continuous annealing is simulated by means of finite difference *** on the Scheil superposition principle,the continuous heating transformation curve is obtained by using time temperature transformation(TTT)curve which is measured *** developed program has been used in practice,and the strip speed on production line increases bv more than 10%.

关键词： computer simulation cold rolling continuous annealing recrystallization continuous heating transformation

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NON-EQUILIBRIUM SEGREGATION OF SOLUTE TO GRAIN BOUNDARIES

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Acta Metallurgica Sinica(English Letters) 1990年第1期3卷 40-45页

作者： CHU Youyi ZHANG Sanhong he xinlai KE Jun(T.Ko){2.,china CHU Youyi Professor,The Nonferrous Metals Society of china,Room 602.B12.Fuxing Road,beijing 100814,china

In consideration of the local equilibrium among vacancies,solute atoms and vacancy-solute atom complexes and the influence of equilibrium grain boundary segregation,theoretical dy- namic formulas for non-equilibrium grain boundary segregation of solute have been derived on the basis of the vacancy-dragging *** calculation by computer has been carried out for the non-equilibrium segregation of boron to austenitic grain boundaries during isothermal holding and continuous cooling after heating at high *** re- suits agree well with those obtained from experiments.

关键词： solute boron non-equilibrium segregation grain boundary

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Semi-solid Casting of High Speed Steel Ingots Using Inclined Slope Pre-crystallization Method

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Journal of Wuhan university of technology({2. science) 2009年第5期24卷 750-752页

作者：和优锋 State Key Laboratory for Fabrication and Process of Nonferrous Metals General Research Institute for Nonferrous Metals

Semi-solid casting of M2.high speed steel ingots was investigated by inclined slope pre-crystallization method. Effects of casting temperature and slope length on the microstructure of M2.HSS ingots were investigated. M2.cast ingots of non-dendritic primary austenite and fine eutectic ledeburite network carbide structure were obtained, with the casting temperature, slope length and angle of 1480 ℃, 500 mm and 60° respectively. Meanwhile, the microstructure of cast samples was quantitatively assessed by Image tool software. Results show that optimum mean equivalent diameter of primary austenite crystal grain is 50.8 μm, shape factor is 0.83, and mean thickness of network carbide is 5.2. μm.

关键词： M2.high speed steel semi-solid pre-crystallization inclined slope

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Effect of sliding velocity in vacuum on tribological behavior of nitrided 2.r13 steel

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Rare Metals 2007年第S1期26卷 195-198页

作者： WANG Gang,MA Xinxin,TANG Guangze,LIU Yong,YANG Dezhuang,and he Shiyu school of {2. science and Engineering,Harbin Institute of technology,Harbin 150001,china Harbin Inst Technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The effects of sliding velocity on the friction and wear of 2.r13 pin/2.r13 nitriding disc in vacuum were *** result show that the friction properties of 2.r13 nitriding under high sliding velocity(1.6 m·s-1) is better than that under low sliding velocity(0.8 m·s-1).The friction coefficient was 0.4～0.5 when sliding velocity was 1.6 m·*** specimens under vacuum condition are easier to adhere,and the wear under 1.6 m·s-1 is higher than that under 0.8 m·s-1.

关键词： vacuum 2.r13 nitriding friction

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Recent progress in fingerprint recognition

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Progress in Natural science:materials International 2006年第3期16卷 231-240页

作者： TIAN Jie, CheN Xinjian, ZHANG Yangyang, YANG Xin, he Yuliang, LI Liang, XIE Weihua and ZheNG Zhipeng (Center for Biometrics and Security Research, Key Laboratory of Complex Systems and Intelligence science, Institute of Automation, Chinese Academy of sciences, beijing 100080, china Graduate school of the Chinese Academy of sciences, beijing 100080, china) Center for Biometrics and Security Research Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Graduate school of the Chinese Academy of {2.s Beijing 100080 China

Fingerprint recognition has been increasingly used to realize personal identification in civilian' s daily life, such as ID card, fingerprints hard disk and so on. Great improvement has been achieved in the on-line fingerprint sensing technology and automatic fingerprint recognition algorithms. Various fingerprint recognition techniques, including fingerprint acquisition, classification, enhancement and matching, are highly improved. This paper overviews recent advances in fingerprint recognition and summarizes the algorithm proposed for every step with special focuses on the enhancement of low-quality fingerprints and the matching of the distorted fingerprint images. Both issues are believed to be significant and challenging tasks. In addition, we also discuss the common evaluation for the fingerprint recognition algorithm of the Fingerprint Verification Competition 2.04 (FVC2.04) and the Fingerprint Vendor technology Evaluation 2.03 (FpVTE2.03), based on which we could measure the performance of the recognition algorithm objectively and uniformly.

关键词： biometrics fingerprint enhancement matching minutia image registration similarity measures.

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Mechanical Alloying of Fe_(100-x)B_x

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Journal of materials science & {2. 1997年第3期13卷 230-232页

作者： Lizhi CheNG Wei FENG Xinquan DONG Kuichang BAI and Kaiyuan he (Dept. of {2. science and Engineering, Northeastern university Shenyang 110006, china) Dept. of materials science and Engineering Northeastern University Shenyang 110006 China

The formation of nonequilibrium phase by mechanical alloying (MA) of Fe and B powders in a high energy vibration ball mill has been made for Fe100-xBx system with x=15. 30, 35, 45,55 and 70. By using the X-ray diffraction, magnetic measurement and M6ssbauer spectrummethods, it was revealed that the structure of the MA product varies with milling time and B contents.

关键词： Mechanical Alloying of Fe x)B_x

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Optimization of Processing Parameters for Laser Powder Deposition using Finite Element Method

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Journal of Wuhan university of technology({2. science) 2010年第5期25卷 832-837页

作者：付垚 State Key Laboratory of Non-ferrous Metals and Processes General Research Institute for Non-ferrous Metals

In order to investigate the effects of powder materials and processing parameters on thermal and stress field during laser powder deposition （LPD）, a finite element model was developed with the help of ANSYS software. The finite element model was verified by the comparison between the experimental results and computed results. Then LPD processes with different powder materials and processing parameters were simulated by using the FE model. The results show that less difference of thermal conductivity and thermal expansion coefficient between powder material and substrate material produces lower residual stress; higher laser power, laser scanning speed and smaller laser beam diameter can lead higher peak temperature and higher residual stress. The research opens up a way to rational selection of the powder materials and processing parameters for ensured quality.

关键词： laser powder deposition thermal field stress field powder material processing parameters

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