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A New Family Programme in Zhejiang Province

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China Population Today 1994年第2期11卷 10-12页

作者： b xu

Sincc April 1993,a new family programrn:char-actcrized mainly by deferred marriagc and dcfcrrcd childbearing,fewer bul hcalthier births,modernizing family life and achicving prosperity through industri-ous work has been promoted in Zhejiang *** programme intcgratcs family planning into the de-velopment of a socialist markct cconomy and the es-ta blishment of modern *** programme is welcomed by local residents for it scrvcs pcoplc's intcr-csts and providcs assistance to production,improvc-ments in their livelihoods and family planning serviccs.

关键词： Family

EXPERIMENTAL AND THEORETICAL INVESTIGATION OF PSEUDOELASTIC HYSTERESIS IN SHAPE MEMORY ALLOYS

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 235-240页

作者： Gong, S.K. xu, H.b. beijing Univ of Aeronautics and Astronautics Beijing China

The pseudoelastic hysteresis loop associated with phase equilibrium and the stress relaxation on the yield line were investigated, and the theoretical description was confirmed by deformation controlled load-deformation measurements on CuZnAl single crystals. It was found that in a loading-unloading process, the states of shape memory alloys run through a hysteresis loop, and the points that trigger the internal yield and recovery inside the pseudoelastic hysteresis loop define a line that traverses the hysteresis loop from the upper left to the lower right corner. This line was interpreted as a line of unstable phase equilibrium according to the thermodynamic arguments, which determines also the tendency for stress relaxation on the yield line section and for a stress growth on the recovery line section.

关键词： Aluminum copper alloys Hysteresis Stress relaxation

Ceramic Carbon/Polypyrrole Materials for the Construction of bienzymatic Amperometric biosensor for Glucose

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Chinese Chemical Letters 2001年第11期12卷 1011-1014页

作者： Tian, FM Zhu, LD xu, b Zhu, GY Chinese Acad Sci Changchun Inst Appl Chem Electroanalyt Chem Lab Changchun 130022 Peoples R China

A novel amperometric glucose biosensor was constructed by electrochemical formation of a polypyrrole (PPy) membrane in the presence of glucose oxidase (GOD) on the surface of a horseradish peroxidase (HRP) modified ferrocenecarboxylic acid (FCA) mediated sol-gel derived ceramic carbon electrode. The amperometric detection of glucose was carried out at +0.16 V (vs. SCE) in 0.1 mol/L phosphate buffer solution (pH 6.9) with a linear response range between 8.0x10(-5) and 1.3x10(-3) mol/L of glucose. The biosensor showed a good suppression of interference and a negligible deviation in the amperometric detection.

关键词： biosensor for glucose polypyrrole ceramic carbon electrode sol-gel

Indium Composition Dependence of the Size Uniformity of InGaAs Quantum Dots on (311)b GaAs Grown by Molecular beam Epitaxy

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Journal of Materials Science & Technology 1999年第6期15卷 523-526页

作者： Jiang, WH xu, HZ xu, b Zhou, W Gong, Q Ding, D Liang, Jb Wang, ZG Chinese Acad Sci Inst Semicond Lab Semicond Mat Sci Beijing 100083 Peoples R China

The deposition of InxGa1-xAs (0.2 less than or equal to x less than or equal to 0.5) on (311)b GaAs surfaces using solid source molecular beam epitaxy (MbE) has been studied. both AFM and photoluminescence emission showed that homogeneous quantum dots could be formed on (311)b GaAs surface when indium composition was around 0.4. Indium composition had a strong influence on the size uniformity and the lateral alignment of quantum dots. Compared with other surface orientation, (100) and (n11) A/b (n=1,2,3), photoluminescence measurement confirmed that (311)b surface is the most advantageous in fabricating uniform and dense quantum dots.

关键词： Semiconducting gallium arsenide

Ellipsometric Spectra and Optical Properties of Anisotropic Srbi2Ta2O9 Films

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Chinese Physics Letters 2004年第2期21卷 266-268页

作者：莫党刘毅 G.D.Hu J.b.xu StateKeyLaboratoryofOptoelectronicMaterialsandTechnologiesandDepartmentofPhysics ZhongshanUniversityGuangzhou510275 NormalCollege ShenzhenUniversityShenzhen518060 DepartmentofElectronicEngineeringandMaterialScienceandTechnologyResearchCenter TheChineseUniversityofHongKongHongKong

Ellipsometric spectra of the Srbi2Ta2O9 (SbT) films of (200) and (0010) predominant orientation are measured and analysed in the range of photon energy from 2 to 5 eV. The results show that the oriented SbT films appear to be strongly anisotropic. The ellipsometric spectra of the (200)-predominant SbT films are different from those of the (0010)-predominant films. We suggest an analysis model for these oriented films and perform the fitting of the anisotropic ellipsometric spectra. The refractive index and the extinction coefficient of the ordinary ray and the extraordinary ray for these oriented SbT films are obtained. The ordinary refractive index is larger than the extraordinary one.

关键词： Condensed matter: electrical magnetic and optical Surfaces interfaces and thin films

Active Network Supports for Mobile IP

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Journal of Computer Science & Technology 2001年第6期16卷 544-551页

作者： Lu, Y. Qian, D. xu, b. Wang, L. Dept. of Computer Science and Eng. Xi'an Jiaotong University Xi'an 710049 China

The basic mobile IP protocol is difficult to implement on the traditional IP network and not flexible and efficient under certain conditions. For example, firewalls or bound- ary routers may drop packets sent by mobile nodes for security reasons. Traditional networking devices such as routers cannot dynamically load and unload extended services to achieve differ- ent qualities of services. In this paper, a new scheme of using the active network to support the mobile IP is presented. The Softnet, a prototype of active networks based on mobile agents, is introduced. The active network is characterized by the programmability of its intermediate nodes and therefore presents dynamic and flexible behaviors. Special services can be dynam- ically deployed onto the active nodes in the Softnet. This property is definitely required in implementing the mobile IP protocols. The Softnet supports not only the basic mobile IP pro- tocol but also other extended mobiIe IP protocols. Virtual networks for mobile IP services are dynamically formed by mobile agents in the Softnet to provide different qualities of services.

关键词： mobile IP Softnet active network mobile agent virtual network

Microstructural characteristics of Nd_2Fe_(14)b/α-Fe nanocomposite ribbons bearing Nb element

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Rare Metals 2008年第3期27卷 299-302页

作者： WANG Zhanyong LIU Wenqing ZHOU bangxin NI Jiansen xu Hui LI Qiang Department of Materials Engineering Shanghai Institute of Technology Shanghai 200235 China Institute of Materials Shanghai University Shanghai 200072 China

The effects of Nb on the microstructure and magnetic properties of （Nd0.9Dy0.1）9.5Fe79_xCo5Nbxb6.5 （x = 0, 1） nanocomposite magnets were investigated. A fine and uniform microstructure was achieved for the ribbons annealed at 710℃ for 4 min, enhancing the interaction coupling between grains and improving the magnetic properties. The results of three-dimensional atom probe （3DAP） indicated that Fe-Nb-b inter- granular phase existed at the grain boundaries, suppressing the grain growth during the crystallization process. The coercivity was improved from 224 to 643 kA/m for the modification of the microstructure.

关键词： Nd2Fe14b/α-Fe nanocomposite magnet 3DAP magnetic properties

MATHEMATICAL MODELLING OF PHASE TRANSFORMATION FROM HOT-DEFORMED AUSTENITE IN LOW CARbON STEELS

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Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 204-210页

作者： Y.b.xu G.D.Wang X.H.Liu State Key Laboratory of Rolling And Automation Northeastern University Shenyang 110004 ChinaState Key Laboratory of Rolling And AutomationNortheastern University Shenyang 110004 ChinaState Key Laboratory of Rolling And AutomationNortheastern University Shenyang 110004 China

On the basis of superelement model, Cahn’s transformation kinetics theory and Scheil’s additivity rule, the CCT diagrams and transformation kinetics in low carbon steel were predicted considering both undeformed and deformed conditions. The influence of deformation on phase equilibria and transformation incubation period was evaluated quantitatively. The recrystallization kinetics and the evolution of dislocation density were calculated during continuous cooling. The results show deformation considerably shortens transformation incubation period, accelerates transformation kinetics and makes CCT curve shift leftwards. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with measurements.

关键词： thermodynamics transformation kinetics continuous cooling hot-deformed austenite

THE INFLUENCE OF Mo DIFFUSION ON THE THERMAL bEHAVIOR OF TbCs ON Ni_3Al bASED ALLOY IC-6

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Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 45-48页

作者： D.b. Zhang S.K. Gong H.b. xu Y.F. Han Department of Materials Science and Engineering Beijing University of Aeronautics and AstronauticsBeijing 100083 China Cast Superalloy Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China

Conventional two-layered structure thermal barrier coatings (TbCs) were prepared onto γ'-Ni3Al based alloy IC-6 by electron beam physical vapor deposition (Eb-PVD). Isothermal oxidation and thermal cycling tests were carried out to investigate the effect of Mo content at the interface between bond coat and ceramic top coat caused by diffusion. It has been found that the alloy coated with TbCs presented the lowest oxidation weight gain value for the reason that the ceramic top coat in TbC system can effectively stop Mo oxides evaporating. The life time of TbCs has close relation with Mo content at the interface between the bond coat and top coat. Spaliation of ceramic top coat occurred during thermal cyclic testing when Mo atoms accumulated at the interface up to certain amount to decline the combination between the bond coat and top coat.

关键词： Eb-PVD thermal barrier coatings (TbCs) thermal cyclic diffusion