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Dynamic Analyzing the Vibro-Impact System with Time-varying Mass Yan Zhu1, a, Shulin Wang2, b, Shishun Zhu1, c 1Department of Automobile Engineering, Military Transportation University, Tianjin, 300161, China 2School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China azylzl@163.com, bwangshl@online.sh.cn, czhushishun@yahoo.com.cn Keywords: Vibro-impact with Time–varying Mass, Chaos, Bifurcation, Lyapunov Exponent Abstract.
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Table 2 Absorbed Energy, PSD peak and Strain Energy for both materials No Material Ave.
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To date, nickel-based superalloy has been the main raw materials in aerospace industry due to its outstanding performance in high-temperature strength, thermostability and corrosion resistance as well as fatigue resistance; it has been widely utilized in manufacturing turbine disk, aerial shaft and other aviation parts [2].
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Materials and Methods Initial powders were obtained from fossilized calcareous shells and were described elsewhere [5].
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Introduction The addition of elements which improve the room-temperature strength and high-temperature creep resistance of materials plays an important role in alloy design.
The Fermi energy level is shifted to zero Acknowledgements This work was supported by the National Natural Science Foundation of China (Grant No. 10705055) and the Science Foundation of the Central South University of Forestry & Technology (Grant No. 06y016).
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Usually earth rockfill materials of cofferdam will be changed as its particle breakage and position transformation during cofferdam construction and working processing on account of materials sedimentation or external load fluctuation such as water pressure change induced by upstream water level change, of course the material parameters of which will change great.
Based on strength reduction method, considering change of intensive parameter of earth rockfill materials during cofferdam construction, the slope stability safety coefficient calculation model can be expressed as : （2） In which denotes earth rockfill materials confining pressure which changes with alteration of filling process, represents internal friction angle of earth rockfill materials on the condition that equals atmospheric pressure, designates the magnitude of reduction of as increment of , c is cohesion of materials.
[4] ZHENG Ying,CHEN Xianming, in: Journal of Hydroelectric Engineering.
[5] Yu Shu, Chen Lihong, Xu Zeping, Chen Ning, in: Advanced Materials Research.
[6] LI Zhenze,GUO Zengyu, in: Journal of Hydroelectric Engineering.

The experiment explored the impact of KT dedifferentiation of wheat anther to find the most suitable concentration of wheat anther culture by adding different concentration of KT in C17 medium, thereby optimizing medium to improve wheat anther callus formation. 1 Materials and methods 1.1 Tested materials.
Materials needed cold pretreatment for 2 ~ 3 days in the refrigerator at 4 ℃ .
This shows that when the materials changed, the concentration of KT need to be tested and adjusted, in order to find the suitable hormone concentration to improve the rate of callus induction of wheat anther.
Therefore, the ratio of 2, 4-D/KT between 1 ~ 8, which can promote the induction of callus of wheat materials tested.
Chen: Journal of Integrative Plant Biology, Vol. 28 (1986) No.1, p.38

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