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Therefore, many researchers have developed all kinds of new wear resistant materials in order to substitute for high manganese steel under impact abrasive wear conditions.
Experimental Materials and Test Methods Experimental Materials.
Table 1 Mechanical property of test materials Test materials Tensile strength [MPa] Yield strength [MPa] Elongation [%] Reduction of area [%] Hardness [HRC] Impact toughness [J/cm2] 25Si2MnNi3 1535 1310 11.5 60.0 46.2 51 53Si2MnNi3 2250 1890 7.3 37.0 57.6 13 Mechanical property of test materials is shown in Table 1.
Rao: Journal of Materials Processing Technology, Vol. 116 (2001) No.2-3, pp.176-181
Gahr: Microstructure and Wear of Materials-Tribology Series, Vol. 10 (Elsevier, Holand 1987).

Materials of wheat anther culture are drawn in mid-end of April and first 10 days of May.
If return to the super-clean bench without disinfection, materials on the bench will be contaminated.
(1) Draw materials at 9~10 o’clock AM and 3~4 o’clock FM of sunny day to avoid rain, haze, smog and dew
Mu, et al: Anhui Agricultural Sciences, vol. 33 (2005) no. 12, p. 2357- 2358 [4] J.H.
Yang, et al: Journal of Microbiology, vol. 22 (2002) no. 2, p. 53-55

The soldering critical temperature is determined by the elements in both the casting alloy and the die material and is equal to the solidus temperature of the resulting alloy.
In ASM Handbook Aluminum Science and Technology; ASM: Almere, The Netherlands, 2018; Volume 2A, pp. 400–408
Viswanathan, Analysis of the mechanism of die soldering in aluminum die casting, Metallurgical and materials transactions A. 33 (2002) 1-8
Seifeddine, Effect of Co and Ni addition on the microstructure and mechanical properties at room and elevated temperature of an Al–7%Si alloy, International Journal of Metalcasting. 13 (2018) 434-440
Polycarp, Effect of chromium and cobalt additions on the corrosion resistance of aluminium-silicon-iron alloy, International Journal of Scientific & Engineering Research. 3 (2012) 1-10.

Model Design Requirements and Selection The requirement of model design is that the model should verify the stiffness and deformation demand under horizontal dynamic load and minimize the material consumption.
The main material includes: Broad, 1thick, 55 wide; Batten, 2×2(), 2×4(), 2×6(), 2×8(); Modulus of elasticity is 104, strength under press is 30; Adhesive: 502 glue.
To facilitate the analysis of software, some assumption are needed as follows: (1)Material is continuous and uniform
Fig. 6 The picture of loading Conclusions Innovation is dominant power in the future development, and also the soul of science and technology.
Journal of Anhui Architecture Industry University (in Chinese), Vol. 5(2009), pp. 17-21 [2] Xinqiang Tang, Tiandi Chen, Yingping Zeng: Structure Model Experiment and Model Design(in Chinese).

At the same time, mechanical spring can not only bring metal material consumption, but also produce vibration, Noise, and influent hydraulic valves the stability and reliability of system, and the structure of the magnetic spring is Simple, it can replace the function of mechanical spring, so we study and design the permanent magnetic spring type relief valve used in the hypersonic cruise missiles, which have large application and research value.
The magnetic hydraulic relief valve (as shown in Fig. 5) consists of: 1. valve body (non-magnetic material), 2. main valve core, 3. main valve seat, 4. magnet (NdFeB), 5. valve seat (non-magnetic material), 6. adjusting ring(non-magnetic material)
Mead : Internat Journal of Mathemat Education in Science and Technology, Vol.37 (2006) No.3, p.321

Production and Grain Refinement of ASTM A668D Steel Heavy Main Shaft for Crusher Zhou Yucheng1,a, Wei Shizhong1,b, Shi Yulin2 and Xu Liujie1 1Henan Engineering Research Center for Wear of Materials, Henan University of Science & Technology, Luoyang, Henan, 471003,China; 2CITIC Heavy Industries Co., Ltd., Luoyang, Henan, 471039,China azycwlm@163.com, bwsz@mail.haust.edu.cn Keywords: grain refinement; heat treatment; modification; main shaft Abstract.
Introduction Crusher is widely used in mining, smelting, building materials, roads, railways, water conservancy, chemical industry and many other departments.
[3] Yan Xiaofeng, Zhang Hongtao, Wang Ruizhen, Pang Ganyun: Journal of Iron and Steel Research, Vol.12 (2000), No.2, P.49-53

The concrete strength grade for twin-tower building with enlarged base 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 twin-tower building with enlarged base Material for calculation model Density(kg/m3) Elastic modulus(GPa) Twin-tower building with enlarged base 2500 32.5 Soft soil layer 1800 0.5 Bedrock layer 2600 50 Material for calculation model poisson's ratio Damping ratio Twin-tower building with enlarged base 0.2 0.05[3] Soft soil layer 0.35 0.05 Bedrock layer 0.25 0.05 Element selection.
Journal of Building Structures, 2009(5): 102-107
Sichuan Building Science, 2005(4): 88-90

Shock reliability of comb accelerometer Jia Yubin 1, a, Wang Shitao 1,b, Huang Qinwen 2,c ,Hao Yilong1,d 1National Key Laboratory of Micro/Nano Fabrication Technology, Institute of Microelectronics, Peking University, Beijing,100871, China 2National Key Laboratory of Science and Technology on Reliability Physics and Application Technology of Component, The 5th Electronics Research Instituteof the Ministry of Industry and Information Technology, Guangzhou 51061,China aJiayubin600@sohu.com, bwangshitao@ime.pku.edu.cn c97123012@163.com dylhao@ime.pku.edu.cn Keywords: Accelerometer, shock, reliability, stress, strain, beam.
The transient area of the beam of bearing proof mass in the accelerometer structure is the same one, and vibration equation is written as (1) Where is the density of beam material, A is the area of the beam, andE is Young’ modulus of the material.The half-sine pulse waveform is used here to approximate the shock experienced by the comb accelerometer, as it is one of the most common shock waveform and provides an excellent description of the acceleration curve.
The shock amplitude is , the shock frequency is ,, the shock time is, and silicon material density is , Young’ modulus of silicon material is， the length of double-clamped beam (bearing beam) is l =357μm, the width b=60μm，the thickness h=6.4μm.
[2] Jiang Lili, Tang Jieying, Chinese mechanical engineering (Z), 212-214, (2005) [3] Lv Jinnan, Tang Jieying, Chinese Journal of functionals and devices, Vol.14, No.1 p. 103-106, 2008 [4] Xingguo Xiong, Yu-Liang Wu, and Wen-Ben Jone, IEEE International Symposium on Defect and Fault Tolerance of VLSI Systems, p.314-322 (2008)

Introduction Wave propagation in saturated porous media is an important issue of engineering sciences, such as geophysics, geomechanics, seismic prospecting, bioengineering etc.
The theory of two-phase porous material, which consists of elastic skeleton and fluid, was introduced by Biot [1, 2].
Default poroelastic material constants are: , , , ,, , , , that corresponds to Berea sandstone (rock).
The poroviscoelastic media modelling is based on Biot’s theory of porous material in combination with the elastic-viscoelastic corresponding principle.
Durbin, Numerical inversion of Laplace transforms: an efficient improvement to Dubner and Abate’s method, The Computer Journal. 17, (1974) 371–376.

., Brazing Alloys by Rapid Solidification, in "Encyclopedia of Materials Science and Engineering, First Supp
Cahn, Ed., Pergamon Press, 1989, [3] Rabinkin, A., Wenski, E., Ribando, A., Brazing Stainless Steel Using a New MBF-Series of Ni-Cr-B-Si Amorphous Brazing Foils, Welding Journal, Vol.77, Nr.2, 1998, p.66-75
[4] Codrean C., Mitelea I., Şerban V.A., Structural Morphology of Transformation by Vacuum Oven Brazed Joints with Amorphous Alloys , Advanced Materials Research, 23, 2007, p. 221-224