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The low content of fluoride in drinking water and the high incidence of dental decay in He-Jia-Ping, Chang Yang, HuBei Province, China Tao Li*, Qiao-dan Qu College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, Hubei Province, 443002, China Keywords: fluoride; dental decay; water Abstract.
Materials and methods Study areas The study area is located in He-Jia-Ping, Chang Yang, HuBei Province, China.
Buzalaf: Journal of Dentistry Vol. 42 (2014), p. 498 [3] F.

The only effective "load" in modal analysis of tower -- its own gravity load can be defined by the material density and the acceleration of gravity.
f1=12.9 Hz f2=17.94Hz f3=41.33Hz f4=48.75Hz f5=83.75Hz Fig.4 The first spindle’s vibration mode The figures above are the first spindle’s modal,the next two figures are the two other spindle’s vibration mode f1=4.85 Hz f2=4.98Hz f3=30.00Hz f4=30.85Hz f5=82.05Hz Fig.5 The second spindle’s vibration mode f1=4.59 Hz f2=4.91Hz f3=28.73Hz f4=28.98Hz f5=79.61Hz Fig.6 The third spindle’s vibration mode Conclusion The large scale tower in this article, although the material of the tower is steel,as the huge geometry and special mechanical structures,the tower will reflect some flexible features.
Journal of Chongqing Jianzhu University.Dec.2005.
Mechanical Science and Technology, 1997,16 (4) :590-594 [5] Evtim Zahariev.

Power Transfer Coefficients Between Two 3D Semi-Infinite Solids in EFEA Formulation Xiliang Chen1, a and Wenwu Zhang1,b 1Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, China achenxl@nimte.ac.cn, bzhangwenwu@nimte.ac.cn Keywords: EFEA, Power Transfer Coefficients, 3D Solid, Wave.
Heron, Elastic wave transmission through plate/beam junctions, Journal of Sound and Vibration Vol.143(2) 241-253(1990)

Acknowledgement This research is supported by Fundamental Research Funds for the Central Universities of China (HEUCF100205, HEUCFZ1102), National Natural Science Foundation of China (50908059), and Heilongjiang Postdoctoral Funds for Scientific Research Initiation.
[3] SONG Haiyan, FAN Tao: Energy Principle in Crack Propagation, Key Engineering Materials, 2012, Vols.488-489, pp: 593-596
[7] Song Hai-yan, Liang Li-fu, Zhou Yi-lei : Dual Form of Generalized Variational Principles in General Mechanics, Journal of Harbin Engineering University, 2004, 25(6), pp: 740-742, 760

(Fig.3(a), (b)) [1] Fig. 2 The typical capital investments in modernbuilding construction(after E.Miranda)[1] Andre Filiatrault tested and analyzed the seismic performance of nonstructural components with the aim of developing improved construction systems, with $4 million in National Science Foundation funding, a five year research project.
Earthquake Simulator Testing and Seismic Evaluation of Suspended Ceilings, Journal of Architectural Engineering, 2010; 16(2):63-73
Applied Mechanics and Materials, v166-169, p2221-2225, 2012..

Fig. 1 The rod section in a gas stream The nonlinear equation is examined of not axisymmetric strain of the cylindrical shell of an aspect: (1) where is the cylindrical rigidity, width of the shell wall, Young’s modulus, radius of the cylindrical shell, biharmonic operator, transversal buckling of the shell, Poisson coefficient, uniformly distributed compressing load, tangent loading from the twisting moment M, specific weight of the material, material density, free fall acceleration, pressure of unperturbed gas, Mach number, reduced Mach number, polytropic exponent.
Volmir, Stability of Deforming Systems: Science, Moscow, 1967
Szemplinska - Stupnicka, Higher Harmonic Oscillations in Heteronomous Nonlinear Systems with One Degree of Freedom, International Journal of NonLinear Mechanics, 3, 17-30, 1968.

Beam material properties: material: cast iron; modulus: 110Gpa; Poisson's ratio: 0.28; Temperature: 20 ° C; density: 7.250 × 103kg/m3.
[4] LUO Chuan Li, LI Duan Neng, Mechanical and Electrical Engineering, 2006 (35)45~47 [5] ZHANG Bai Peng,ZHANG Nian Song, Tsinghua University (Natural Science), 2006 (2)191~193
[6] XU Yan Shen, ZHANG Xue Ling, Journal of Southwest Jiaotong University, 2003 (10)517~520.

Study on How sieving parameters of vibration screen influence sieving efficiency based on DEM Wenjin Huang1,a, Yayu Huang1,b, Jun Shi1,cand Shichang Han1,d 1Kunming University of Science and Technology, Kunming 650093, China a792662285@qq.com,bkmhuangyayu@yahoo.com.cn, c673083384@qq.com,d283102424@qq.com Keywords: vibrating screen; sieving parameter; DEM; sieving efficiency Abstract.
A new method of screening granular materials[J].The Quarry Mangers’ Journal, 1965,49(10):409-414

Fig. 3 Real-time curve analysis software interface Field Determining Test about Oilseed Rape Test Materials.
Journal of Sichuan university (engineering science edition), 2000, 32(2):14-15.

The material of spring is 50CrVA wire, service life (Cycle times N) is 106.
Design Variables.This problem requires weight design; the spring weight (W) should become the objective function.The formula of W is: (1) Among them: —material density, density of steel is —number of death circles, , determined From the formula, we can see the key is to select the appropriate parameters of the spring (and), in order to keep the spring lightest.
MachineryVol. 8-11 (1996), p. 21 [3] YouGuozhong,ZhaoXiaodan, WangZhong, and MeiDeqing: The Application of Genetic Algorithm in Cam OptimizationDesign of Diesel Engines.Journal of Jiangsu UniversityVol. 31-34 (2000), p. 21 [4] QiaoMingxing: The Optimum Design of Engine Valve Spring.
Science and Technology of West ChinaVol. 30-31 (2010), p. 218 [5] Jiang Yunzheng, and Zheng Dasu: Structural Optimization (Harbin Engineering University Press, China 1996).