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Other material properties were determined according to the original design of this bridge.
Acknowledgements This work is sponsored by the project of “Study on shear deformation of Segmental joint of main girder in Long Span Cantilever-casting Prestressed Concrete Box Girder Bridges”(50808095) founded by the National Natural Science Foundation of China.
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Acknowledgements The paper is supported by Science and Research Program of Educational Department of Liaoning Province, China (2009A312), National Natural Science Foundation of China(71072081)and National Natural Science Foundation of China (70972008).
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Acknowledgements The work was supported by the National Natural Science Foundation of China (No.51175187), the Science & Technology Foundation of Guangdong Province (No.2012B030900034), and the Science & Technology Foundation of Dongguan City (No. 2012108102010).
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Various reflection characteristics of material surface to laser has resulted to holes in the area which can not be resampled.
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Conclusions The initial defect of drill string was simplified as circumferential semi-elliptical surface crack, and 30CrMo were chosen as material whose constitutional relation was fitted by experiment as Ramberg-Osgood equation.
Acknowledgments This work is supported by National Natural Science Foundation of China (11102173, 51134004) and Key Laboratory of Oil and Gas Equipment from Ministry of Education.
Zhang et al, Comparative study on dynamics behaviors of the full drillstring between gas drilling and mud drilling, Journal of Southwest Petroleum University (Science & Technology Edition). 33 (2011) 139-143
Saxena, J-integral expressions for semi-elliptical cracks in round bars, International Journal of Fatigue. 29 (2007) 822–828
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The flood and ebb current in this area are relatively strong, and the bed material is mainly composed by fine sand and clay.
Acknowledgement This work was financially supported by Science Fund of National Research Institutes of China which provided financial support, under contract TKS120203, TKS120103.
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Such websites may be devoted to general reference, social sciences, human culture and art, and science and technology, etc.
The building of course and learning resources of distance education can never be simple moving of teaching materials, online TV, or multi-media, instead, a whole set of new teaching models conforming to network culture and rules of education must be created.
Hence, the high integration of teaching materials and resources should be emphasized, especially remote and online study assistance.
[2] Zhang Xiaolin, "Towards Knowledge Services: Seeking Development Opportunities for Library and Information Services in the 21st Century", Journal of the Library Science in China, Beijing, Vol.26, No.5, pp.32-37, October 2000
[3] Jing Yhongchang, "On Knowledge Service and Information Services", Journal of Information Science, Beijing, Vol.20, No.5, pp.572-578, October 2001

Moving scale and fixed scale of linear time grating sensor are made from the same metal materials whose thermal expansion coefficient equals that of metal shell of measured objects (such as machine tool).
References [1] Peng Donglin, Liu Chengkang, Tan Weimin, “Study on the Theory of Time-space Coordinate Transformation and the Time Grating Displacement Sensor”,Chinese Journal of Science Instrument, Vol. 21, No. 4, pp. 338-342,2000
“Study on the Time Grating Displacement Sensor of the Field Type”, Chinese Journal of Science Instrument, Vol. 24, No. 3, pp. 321-323,2003
“Comparison Between the Principle of the New Precision Displacement Measurement Method Based on Time Space Coordinate Transformation and Traditional Method”, Chinese Journal of Science Instrument, Vol. 27, No. 4, pp.423-426,2006
“Predictive Measurement Method for Time Grating Displacement Sensor”, Measurement Technology and Intelligent Instruments Ⅷ: Key Engineering Materials, Vol. 381-382pp. 403-406,2008