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Introduction Urban ecosystem is a special kind of human-centered artificial ecosystems, is the city's natural, economic and social sub-systems consisting of an organic complex, with common difference is that natural ecosystems, urban ecosystems, human-centered, man-made changes in its structure, material recycling and energy conversion methods, long-term impact of human activities by terrestrial ecosystems[1].Scientific assessment urban ecological system, figuring out the current values of individual indicators, comparing with the standard or reference target, identifying gaps, analysis the causes, determining the future direction of the building to develop effective strategies is important path to build eco-city[2].Evaluation of urban ecosystem is a complex systems engineering.
Through the establishment of data warehouse, data stored together with the evaluation algorithm can not only accurately be assessed efficiently conclusion, you can also use data mining techniques to predict the future trends in science for decision making.
[2]XU Xiao-xia;ZHANG Ji-xian, The Evaluation on Ecosystem of Luoyang City[J].Journal of Anyang Teachers College,2006(4):99-102
Journal of Wuhan Institute of Technology.2008(1):91-93 [8]ZHANG Kun-min;WEN Zong-guo.

The relatively mature multi-objective genetic algorithm is a kind of searching method of imitate biological evolution based on stochastic theory and has been widely used in various science fields in recent years [6-9].
While a beam structure with variable cross-sections can solve this problem, which is capable of fitting the deformation curve well and reducing material cost as well.
References [1] Lu K J, Kota S: Proceedings of SPIE, Vol. 4693(2002), p.161 [2] Sfidhar Kota, Joel Hetrick, Russell Osbom, Donald Paul, Ed Pendleton, Peter Flick, Carl Tilmann: Proceedings of SPIE, (2003), p.50 [3] (In Chinese)Xiu Chen, Wenjie Ge, Yonghong Zhang, et al.: Acta Eronautica et AStronautica Sinica, Vol. 28(2007), p.1230 [4] (In Chinese)Wenjie Ge, Penggang Zhu, Shili Liu, Yonghong Zhang: Journal of Northwestern Polytechnical University, Vol. 28(2010), p.211 [5] (In Chinese)Guanze Hou, Shutang Liu, Guowei Jian: Engineering Design, Vol. 24(2009), p.30 [6] Farzaneh Hajabdollahia, Hassan Hashemipour Rafsanjani, Zahra Hajabdollahid, Yaser Hamidi: Applied Mathematical Modelling, Vol. 36(2012), p.244 [7] A.
Kheybari: International Journal of Engineering, Vol. 24(2011), p.291 [8] G.

Configuration Analysis of Supercavitating Vehicles Based on Equivalent Pressure Center Method Mingdong Lina, Zhenyu Mab, Weihua Zhangc and Min Xiangd Department of Aerospace Science and Engineering College of Aerospace and Material Engineering National University of Defense Technology Changsha, Hunan, P.R.China almd231@163.com, byuyu1031@163.com, czwh-kjs@163.com, dxiangmin333@hotmail.com Keywords: configuration analysis, equivalent pressure center, supercavitating vehicle.
Uhlman, "Control strategies for supercavitating vehicles," Journal of Vibration and Control, vol. 8, pp. 219-242, 2002
Kurdila, "A Benchmark Control Problem for Supercavitating Vehicles and an Initial Investigation of Solutions," Journal of Vibration and Control, vol. 9, pp. 791-804, 2003

Introduction With the progress of science and technology level, people gradually have higher requirements of the product reliability.
Organic pollutants found inside the relay are mainly come from two aspects, (a) the various internal polymer material components of the relay release organic vapors at high temperatures, (b) organic pollutants are brought into the relay in the manufacturing process.
Haworth, Erosion of Electrical Contacts on Make, Journal of Applied Physics, Vol. 20, pp. 1085-1109, NOV. 1949
Germer, Physical Processes in Contact Erosion, Journal of Applied Physics, Vol. 29, pp. 1067-1082, JULY. 1958

Fig. 1 The South-to-North Water Diversion Bridge (Units: cm) Fig. 2 Typical cross-section of the main girder bridge (Units: cm) Model Building Material parameters. 1) Concrete.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (50078014).
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For the saturated elastic and completely plastic material abiding by Mohr-Coulomb yield criterion, cylindrical cavity expansion induces total stress increment : (1) In plastic zone (1) (2) in elastic zone (2) where, , respectively stands for radial stress increment and tangential stress increment and Vertical stress increment; stands for distance depart from the center of pile ; stands for the radius of plastic zone; stands for undrained shear strength of soil.
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Table 1 Original data for heat exchanger design Hot fluid name Heat transfer oil HD310 Cold fluid name Cooling water Hot fluid inlet temperature 210˚C Cold fluid inlet temperature 50˚C Hot fluid outlet temperature 180˚C Cold fluid flow 225t/h Hot fluid flow 160t/h Cold fluid pressure 0.82 Hot fluid pressure 0.99 Take a fixed pipe and plate heat exchanger, with pure countercurrent flow, pipe material as seamless carbon steel pipe, the fluid speed in pipe side as 1m/s, pipe arrangement pattern in equilateral triangle and arc shaped baffles.
Acknowledgements This work was supported by the Planning Project of Science and Technology of Zhejiang Bureau of Quality and Technical Supervision (No. 20100306).
Methods of measuring the parameters necessary for establishing the performance [6] DB32/T 1328-2009: General Rule of Energy Efficiency Evaluation for Industrial Heat Exchanger [7] Jing Zhu, Hanzhong Tao: Chemical Industry and Engineering Progress, 12(2010), S2 [8] Bejan A, in: Advanced Engineering Thermodynamics, Wiley( 1997) [9] Daxi Xiong, Zhixin Li, Zengyuan Guo: Journal of Engineering Thermophysics.
Vol.18(1)(1997), p. 90 (In Chinese) [10] RAMESH K S: ASME Journal of Heat Transfer, Vol126(12)(2003), p994

Table 3 Relative Weight of Various Product Quality Evaluation Indicators Technical Feature 0.237 Product Scheme 0.236 Product Structure 0.194 Properties of product 0.298 Product Manufacturability 0.271 Economy 0.203 Cost 0.222 Productivity 0.210 Production Cycle 0.178 Production Quality 0.248 Manufacture Resource 0.152 Market & Customer 0.247 Customers’ Demand 0.331 Market Demand 0.352 Service after Sale 0.330 Benefit & Risk 0.159 Benefit 0.549 Risk 0.451 Ecological Environment 0.154 Noise 0.386 Quality of Water 0.341 Wastes Material 0.273 Calculating combination weights.
This work has been supported by science research foundation for Ph.D of Liaoning Province (20101075) References [1] G.
Zhang: Journal of Central China Normal University Vol.39(2005), p.190
Wang: Journal of Northeastern University Vol.27(2006), p.1142

Its material is rolled steel, Modulus of elasticity is 2.06×106 MPa, Poisson's ratio is 0.3, and density is 7.85×103kg/m3.
International Journal of Robotics Research, 7(1988), pp.3-16 [3] W.
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Nanjing Aeronautics and Astronautics University Learned Journal (English version), 28(2011), pp.176-182

Material The study is based on a long term experiment, of more than 3 years, setup in Bistriţa, Bistriţa-Năsăud County, in the region of Transylvania, Romania.
Ren, A New Perspective on Soil Thermal Properties, Soil Science Society of America Journal, 65 (2001) 1641–1647
Illustration with Romanian data, Journal of Renewable and Sustainable Energy, 5 (2013) 1-13