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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.

Those containers that were damaged in the fall from the ship released material in the ocean, which was drifted by currents and winds [12].
Brazilian Journal of Oceanography, 2016, vol. 64, núm. 3, pp. 277-294
Science of the Total Environment, [7] CARRÈRE, L.; LYARD, F.; CANCET, M.; GUILLOT, A.; ROBLOUT, L. (2012).
Journal of Eng.

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.

Seen from fig.4a, untreated surface is smooth, in fig.4b, after treatment by APGD the surface was no longer smooth, there was coarse etching effect and the flake material adhesion to surface.
Tuchida: Journal of Polymer Science Vol. 42 (2004), p. 3727 [2] G.
Kogoma,: Journal of the Vacuum Society of Japan Vol. 51 (2008), p.2 [8] Ultrasonic-nozzle Product Information, Sono-tek, U.S.A., (1996)

The maximum shear stress of thin-walled rings is twice the average shear stress of it which is shown by material mechanics.
[7] Xie Qiang, Wang Xiong, Zhang Jianhua, Xiang peng.(2012).Longitudinal Stress Analysis of Pipeline Buried in Two Different Form of Landslide, Chinese Journal of Underground Space and Engineering,8(3):505-510
[11] Zhang Weifu, Gao Jianzhong, Wang Changan.(2011).Performance Analysis of Home-made X70 SAWL Pipes Used for Sichuan-East Natural Gas Pipeline Project, Technical Communication,40(2):29-33 [12] Li Youlv, Xu Wenbin, Chen Huayan, Zeng Xiangguo,Xu Taolong.(2012).Reliability Analysis of Buried High Pressure Gas Pipeline under the Impact of Rock Fall, Journal of Safety Science and Technology,8(4):29-33.

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)

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.

Table 1 Types of sections Section Material of main chord Structure of main chord[mm] Weight[] Standard section Q235B Square tube 135×135×10 7480 Reinforced section Q235B Square tube 135×135×12 8370 The section is made up of 2 roots diagonal poles, 4 roots main chords, 8 roots tilted belly poles, 12 roots level web members and the connection sleeves up and down etc.
Acknowledgements This research project was financially supported by Liaoning Province Education Department Type A Program (L2010455) and Liaoning Province Science and Technology Support Program (2010402010).
Li: Journal of Shenyang Jianzhu University, Vol. 26 (2010) No.5, p.986.
Li: Journal of Shenyang Jianzhu University, Vol. 21 (2005) No.4, p.399.

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