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Effect of Nd and Dy Addition on AZ91D Ignition Temperature and Microhardness Jian Dinga, Lin Qinb, Yongyan Lic and Weimin Zhaod School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China adjian0122@126.com, bqlin_hbut@163.com, cliyongyan@126.com, dwmzhao@hebut.edu.cn Keywords: AZ91D, Nd, Dy, Ignition, Oxide film, Microhardness.
Experiments Materials preparation.
When a lot of the alloy surface cauliflower shape material formed, the magnesium alloy got to uncontrollably burning.
Acknowledgments The present authors are grateful to the National 863 Project (No.2013AA031002), Natural Science Foundation of Hebei Province of China (E2010000121) and the Science and Technology Research of Hebei Province for Youth fund (No.2011182) for the financial support.
[11] Huang X.F., Zhou H. and He Z.M., ‘Structure analysis of oxidation film of ignition-inhibition AZ91D magnesium alloy added with cerium’, Journal of Rare Earths, 2003,21, 73.

However, aircraft sheet metal parts rubber bladder forming is to rely on the plastic deformation of the material to process.
Therefore, finite element analysis provides new ways of science for mold design, process design and optimization of process parameters.
The material is 2024-O-δ1.5 alumiumalloy with thickness of 1.5 mm.
Material Properties The mould and cover is set as the rigid body and the rubber is super-elasticity material.
(In Chinese) [2] Wang Shuheng, Sun Jining, Wang Wei, et al: Die compensation for sheet metal forming process using PAM-STAMP 2G., Journal of Plasticity Engineering, Vol.14 (2006)No.6, pp.92-95

Material and Method Governing Equations.
Lockington: Tidal effects on sea-water intrusion in unconfined aquifers, Journal of Hydrology, vol.216, no.1-2, pp. 17–31(1999)
Li, Shushen Zhang: Development in Researches on Seawater Intrusion of Coastal Areas, Marine Science Bulletin, vol.23, no.2, pp. 82-87(2004).
Nakagawa: Laboratory-scale saltwater behavior due to subsurface cutoff wall, Journal of Hydrology, pp. 227–236(2009)

Effect of local concrete strength decline on high piers' nonlinear stability Yonggang Xiao 1,a Yujun Liu 1,b 1Changsha University of Science and Technology, Changsha 410076, China axyg9176@163.com, b1986lyj@163.com Keywords: high pier, nonlinear stability, the decline of local concrete strength Abstract:The nonlinear stability of three main piers of Xiniu bridge was analysed with RM Bridge V8i in this paper.
Journal of Xi’an Highway University, 1997 (in chinese) [2] MirzaSA, EdwardA L.
ACI Structural Journal, 2002 [3] LI Song, QIANG Shizhong, TANG Ying.
Stability effect on reinforced concrete for high piers considering material non-linearity.

The material of suspendome is under flexible stage when using , so the analysis of suspendome mainly consider the geometric nonlinearity of the structure .During nonlinear finite element analysis，the equilibrium equations at any moment is[3][4] (2) where,is the stiffness matrices at t,is ierative incremence of the displacement, is load proportions，R is load distribution, is node force vector of elements at 。
References [1] Mamoru Kawaguchi, Masaru Abe, Ikuo Tatemichi: Structure Tests On the“Suspen-dome” System．Journal of the IASS. 40(131) (1999), p. 179-192
Science Publishers(1999)(In Chinese) [4] Xin Chen, Shizhao Shen: Reticulated dome shell load - displacement process and defect analysis.
Journal of building structures.

However, the definition in the science of economy is different from that in geography.
Port coastline resources, as the basic means of production of port construction and shipping development, are one of the indispensable material conditions that make ports exert their transportation effects of “input and out in a large scale”, and also an important natural talent to make regional traffic hub produce effect.
[6] NOTTEBOOM T,COECK C,VAN DEN BROECK J.Measuring and explMning the relative efficiency of containerterminals by means of Bayesian stochastic frontier models[J].International Journal of Maritime Economies,2000,2(2)：83-106
[7] Xu Changxin,Shi Changfeng.Research into Valuation Index System of Port Shoreline Resource [D].Hohai University Journal,2010,8

Target Optimization Design of Cam Curve In Zoom System Chenwei Ning1,a, Caojian Zhong1,b, Yanghong Tao1,c, Zhang Jian1,d, Fanzhe Yuan1,e,Wu Li1,f, Zhang Hui1,g, Leiyang Jie1,h 1Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an 710119,China achenweining501@163.com, bcjz@opt.ac.cn, cyanght@opt.ac.cn, dzj@opt.ac.cn, efzy@opt.ac.cn, fwulisunrise@163.com, gzhanghui2010@ opt.ac.cn, hlyj211314@sina.com Key words: zoom system; optimization design ;cam curve; cam pressure angle; rotation angle.
As shown in Fig.1, in the six times zoom optical system, the focal length range of 11 mm to 66 mm continuously change, on the basis of the existing related design material [8-9] analysis; the pressure angle of cam is usually not more than 45 °.
[2] SHI Y L,WANG Y F,SONG CH P,etal.Active focal length output of zoom lens.Chinese Journal of Scientific Instrument, Vol.27(2006),P.50-51
[4] ZHANG B,HONG Y F,SHI G H.Application of non-uniformity correction to stray radiation suppression of infrared optical system.Opt.Precision Eng., Vol.12(2008),P.2422-2428; [5] CHEN Xin,FU Yue-gang.Optimal design of camcurve for zoom system.Journal of Applied Optic.

The torque developed by the induction motor follows the equation below (6) Despising the voltage drop caused by the stator impedance, the magnetizing flux is found to be (7) where T is torque available on the shaft (N.m), fm is magnetizing flux (Wb), I2 is rotor current (A) depends on load, V1 is stator voltage (V), and k1&k2 are constants depend on material and on the machine design.
International Journal of Engineering, Science and Technology Vol. 3, No. 4( 2011), p. 276-283 [4] Li,C.C., X.D.
,:Electro-Hydraulic Load Sensing with Close Control Actuator”Journal of Advance Production and Management,Vol 4,p.93-109

Based on the experiment, when the frequency is higher than 2.0GHz, its transmission is much influenced by personnel's movement and metal material, and that the signal stability problem need to be carefully considered.
Chinese Journal of Radio Science，2000,9:251-259 [2] ZHANG Heng-wei，ZHANG Yi-xi，FU Jun-mei，CHEN Xiao-bo.
Journal of Microwaves, 2007, 23(8):189-193 [3] Roger A.

With many advantages, composite material has been applied in various fields.
Tarn, et al.: Laminated composite tubes under extension, torsion, bending, shearing and pressuring: a state space approach, International Journal of Solids and Structures, 2001, Vol. 38, p. 9053-9075
[8] Gu Fan: Research on Mechanical Response of Submarine Pipeline, Doctoral Dissertation, Dalian University of Technology, 2009, (In Chinese) [9] Gu Fan, Huang Chengkui, et al.: The tensorial form and rate form of S-R decomposing theorem, Journal of Shenyang Jianzhu University (Natural Science), 2009, Vol. 25(1), p. 6-11, (In Chinese)