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Acknowledgments The authors would like to acknowledge the financial support from Natural Science Foundation of China (No. 61171004) and Institute of Opto-electronic Technique in Beihang University.
Analysis of Polarization-Maintaining Waveguide Used in Resonance Integrated Optical Gyro, Key Engineering Materials, 503 (2012) 156-162 [3] C.H.
Higashiguchi, Kerr effect in an optical passive ring-resonator gyro , Journal of Lightwave Technology. 4.6 (1986) 645-651

Made a group of concrete test specimens according to the true construction field material mixture ratio.
Therefore, this paper use the same material and mixing ratio as the bridge's primary member produced a batch of concrete test-pieces, and cured to predetermined age , one part of the test-pieces are laied aside in spot for outdoor exposure test,and the other are taked back to laboratory for indoor test.
Acknowledgements This work was financially supported by National "Twelfth Five-Year" Plan for Science & Technology Support (2012BAJ17B01, 2012BAJ17B02).
References [1] Jianxin Peng, Jianren Zhang, Cracking Risk, Durability and Life-cycle Cost for RC Bridge Subject to Carbonation-induced Corrosion, Journal of High way and Transportation Research and Development, Vol 28(2)( 2011), p.37-44.

The material is Q235 steel, whose yield stress is 235Mpa.
The density of material is 7800 kg/m3. the Young’s modulus is 2.06×1011N/mm2.
Journal of Zhengzhou University: Engineering Science,2008,29(3):99-102

Introduction Magnesium alloys are promising structural light metals because their low densities, good recyclical potential and abundant resources, which are expected to become next-generation materials [1, 2].
Acknowledgements The authors gratefully acknowledge the financial support of this work by the National Natural Science Foundation of China under contracts No. 50735005.
Luan: Journal of Alloys and Compounds Vol.336 (2002), p.88 [3] S.Kleinerl, P.J.Uggowitzer: Mater.

[3] Zener C: Journal of Applied Physics, 1949, 20(10), 950-953
[8] Crespo D, T Pradell, M T ClavagueraMora, N Clavaguera: Physical Review B, 1997, 55(6), 3435-3444 [9] VanderVen A, L Delaey: Progress in Materials Science, 1996, 40(3), 181-264

Experimental methods The original material used in this work was a hot-rolled steel bars, the chemical composition of the experimental steel bars was analyzed by inductively coupled plasma optical emission spectrometer (ICP) and the weight percentages were 0.32% C, 0.84% Si, 1.19% Mn, 0.012% P, 0.012% S and the balance Fe.
The macro fracture morphology of specimen 1# shows cup cone which reflect the material has good plasticity.
Acknowledgments This work is supported by Key projects in the National Science&Technology Pillar Program during the Eleventh Five-year Plan Period under grant code# 2008BAE61B01.
Wire Journal International, 1992. (8): 49

For instance, sampling inspect the quality of construction material in sites, detect steel’s quality whether meeting the requirement of construction and check the technology of erecting formwork whether the correct.
Fig. 1 The curvilinear relation between construction safety cost and accident rate Conclusion Safety management is a major event mattering material-property safety of our nation and people.
Wang, Discussion on safety management of construction site, Journal of Safety Science and Technology, 8 (2012) 222-225

Acknowledgments This research is sponsored by the National Natural Science Foundation, China (No. 51175527; No. 50835008); and the National Major Scientific and Technological Special Project for “High-grade CNC and Basic Manufacturing Equipment”, China (No. 2011ZX04003-031; No. 2012ZX04011-031; No. 201341012014).
Reliability analysis of machine tool structure．Journal of Engineering for Industry 1977; 99(4): 882-888
Key Engineering Materials 2006; 321-323(II): 1535-1538．

Through the optimization of the structure, not only make the statics performance parts can be improved, but also make the anti vibration characteristics of the structure is improved, saving material, to obtain the optimum size of structure.
Therefore, this thesis mainly studies the content is in the premise of ensuring safe and reliable structure the structure more reasonable by using the finite element analysis method and optimization technique; in ensuring the structure have enough strength, stiffness and stability conditions, saving the material consumption, reduce the product cost; finite element analysis model is established for a generally applicable to the box structure.
Put forward higher requirements for the development of science and technology of a machine tool.
Zhang, The FEM mechanical structure optimization design based on static, dynamic performance, Journal of Southwest Jiao Tong University, 38 (2003) 517-520

Table 3 The PE of backwater height of different mean median grain Natural void radio >1.2 1.2～0.6 0.6～0.3 0.3～0.2 PE(%) 50.4 8.8 40.0 error It is difficult to determine the mean median grain when the riverbed material composition is complex, so it is empirical and arbitrary to determine the mean median grain.
Conclusions The backwater height of the bridge is affected by many factors, such as river flow regime, boundary conditions, riverbed material composition, water blocking ratio of the bridge, and the shape of the bridge pier, etc.
Backwater Characteristics of Speedway Skew Bridges, Hydro-Science And Engineering, Vol. 3 pp.41~46, 2007
An Iterative Method of Backwater Height Calculation for Vegetation Domain, Journal of Hydrodynamics, Vol. 20 pp.79~83, 2005