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The concrete strength grade for prestressed concrete bridge is C40, foundation includes soft soil layer and bedrock layer, material properties of which shows in the table 1.
Table 1 Material properties for calculation model of prestressed concrete bridge Material for calculation model Density(kg/m3) Elastic modulus(GPa) Prestressed concrete bridge 2500 32.5 Soft soil layer 1800 0.5 Bedrock layer 2600 50 Material for calculation model poisson's ratio Damping ratio Prestressed concrete bridge 0.2 0.05[2] Soft soil layer 0.35 0.05 Bedrock layer 0.25 0.05[3] Element Selection.
Journal of Building Structures, 2009(5): 102-107
Sichuan Building Science, 2005(4): 88-90

Tongsri, Density and Strength Improvement of Sintered 316L Stainless Steel, Chiang Mai Journal of Science, R. 2006. 33 (1), 53-66
J., Carburization as a Function of Density and Carbon Potential Advances in Powder Metallurgy and Particulate Materials, MPIF, Princeton, 6 (1997), p. 3
A-Structural Materials Properties Microstructure and Processing, 1999, A 263(2), 210−216

Experiments Experimental materials and equipment.
Experimental materials: cotton fibers Reagent: NaOH, hydrogen peroxide, Oxygen bleaching stabilizer, MY-K2 Cation modifier1#and 2#, reactive orange dyes, X-3B reactive red dyes, NaCl, soda ash, distilled water Instrument: electronic balance, beaker, thermometer, water bath kettle, PH dipstick, Dye cup, measuring cylinder, pipette, rubber pipette bulb, volumetric flask, cuvette, oven, glass rod, 721spectrophotometer.
[J] Basic science journal of textile universities, 2006(19):188-170 In Chinese.

According to the finite element theory, the unit shape matrix: (5) According to the elastic displacement-strain, the unit strain matrix can be written as (6) The stress-strain relationship of orthotropic materials is (7) According to the finite element theory, the total power equation can be obtained
Acknowledgment This work is supported by the National Natural Science Foundation of China (No: 51265038).
[2] Tanaka, N., Sanada, T., Modal control of a rectangular plate using smart sensors and smart actuators, Smart Materials and Structures, 16(1), pp.36-46(2007)
P., Piezoelectric sensor configuration for active structural acoustic control, Journal of Sound and Vibration, 246, pp.175–83(2001)

The effect of Magnesium on the modifying efficiency of strontium in A356 alloy Anil Chacko1, a *, M.C.Shaji2, b, Brahma Raju Golla1, c 1 Department of Metallurgy and Materials Engineering, National Institute of Technology Warangal- 506004, Telangana, India 2Materials Science and Technology Division, CSIR- NIIST, Trivandrum-695019, Kerala, India ackanil619@gmail.com, bmcsniist@gmail.com, cgbraju121@gmail.com Keywords: Al-Si-Mg alloy, A356, Strontium modification, Modification Rating Abstract This study was undertaken to investigate the effect of different concentrations of magnesium (0.2%, 0.3%, and 0.4%) on the modifying efficiency of Sr in aluminium alloy A356.
References [1] J E Gruzleski and B Closset , Mechanical properties of A356.0 Alloys modified with pure strontium, AFS Transactions, 90(1982), 453-464 [2] Modification of Aluminium-Silicon Foundry Alloys, London and Scandinavian Metallurgical Co Ltd, 1998 [3] J E Gruzleski and B Closset, The Treatment of Liquid Al-Si Alloy,American Foundrymen’s Society, Inc.; Illinois, 1990 [4] A T Joenoes and J E Gruzleski, Magnesium effects on the microstructure of unmodified and modified Al-Si alloys, International Journal for Cast Metals, Vol 4, No 2,(1991), 62-71 [5] Tongmin Wang , Yuanping Zheng , Zongning Chen , Yufei Zhao, Huijun Kang , Effects of Sr on the microstructure and mechanical properties of in situ TiB2 reinforced A356 composite, Materials & Design, Vol 64, December (2014), 185–193

Materials and Experimental Methods Materials.
Andrew: Journal of Colllid and Inerface Science Vol. 217 (1999), pp.203

Fig. 2 FEM model of the Resonator The material of the resonator is a kind of nickel alloy, whose major properties are listed in Table 1.
And the material is assumed to possess isotropic and homogeneous properties.
To improve the performance of the vibratory cylinder gyroscope, the material and the method to fix the resonator should be designed carefully.
This work was supported by National Natural Science Foundation of China (Grant no.51005239).
Rogers, The influence of control system design on the performance of vibratory gyroscopes: Journal of Sound and Vibration Vol 255(2002), p. 417

Experimental 2.1 Materials Table 1 Multi-element analysis results Elements Cu Fe CaO MgO Ag(g/t) Al2O3 content（%） 0.16 9.35 1.68 2.97 <5 15.99 Elements SiO2 Au(g/t) Sn As Zn S content（%） 52.58 <0.1 0.054 0.25 0.3 1.07 The sample used in this work was collected from the Wenshan copper mine, Yunnan Province, China.
The results of multi-element analysis were shown in Table 1, the analysis of copper phase were shown in Table 2, And the XRD pattern of material were shown in Figure 1.
Table 2 Analysis of copper phase Phase Blue copper Oxide copper Sulfide copper Total(sum) Content（%） 0.004 0.016 0.14 0.16 Distribution（%） 2.50 10.00 87.50 100.00 Formula Content Reference Figure 1 XRD pattern of material Table 1, Table 2 and Figure 1 shows the copper grade of ore is very low, only 0.16%；the sample is mainly exists in form of sulfide copper, the distribution rate as high as 90.74%；the main valuable minerals are Chalcopyrite and Sphalerite, the gangue minerals are mainly quartz and Muscovite, etc. 3 Results and discussion Based on the properties of the ore, the main metal minerals are pyrite and chalcopyrite, the main valuable minerals are chalcopyrite, because the owners live production of bulk flotation process, In order to improve concentrate grade and recovery under the premise of the production process, so this test intended as a principle of flotation process, shown in Figure 2.
References [1] Y.jing：Research on a low grade sandstone copper, Master degree thesis, Kunming university of science and technology, 2011
[2] Fomasiero D,Fullston D,and so on：Intemational Journal of mineral Proeessing, vol.61(2001), p.109

This method is planned to involve in research methods used in other branches of science for example medicine [6].
Solvability of the boundary-value problems for the Boussinesq equations with inhomogeneous boundary conditions // Journal of Mathematical Fluid Mechanics. 2001.
Experimental research of the nozzles // Advanced Materials Research. 2014. № 915-916.
Calculation reactivity degree for axial low-account turbines with small emergence angles of nozzle devices // Advanced Materials Research. 2014. № 915-916.

Selection of element and material characteristics Selection of element.
FEP is a anisotropic material.
Many literatures confirm that FRP’s constitutional relationship is near perfect elastic material, so we think BFRP sheet’s constitutional relationship is linear.
It is a anisotropic material and it’s axial Poisson’s ratio is only 0.015~0.06 while concrete’s ratio is 0.1~0.2.
Acknowledgements Supported by Program for Liaoning Excellent Talents(LNET)and Liaoning Province Science Public Research Fund Project.