Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.I...Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.In order to measure the mechanical properties of nickel film microbridges,special shaft structure is designed to solve the problem of getting the load--deflection curves of metal film microbridge by Nanoin--denter XP system with normal Berkovich probe.Theoretical analysis of the micro--bridge load--deflection curve is proposed to evaluate the Young's modulus and residual stress of the films simultaneously.The calculated results based on the experimental measurements show that the average Young's modulus and residual stress are around 190GPa and 175MPa respectively,while the Young's modulus measured by Nano-hardness method on nickel film with silicon substrate is 186.8±7.34GPa.展开更多
The present status of studies on regeneration of tomato in vitro was introduced, and the key factors that influence the shoot regeneration system in tomato were summarized, such as genotypes, explants type, explant ph...The present status of studies on regeneration of tomato in vitro was introduced, and the key factors that influence the shoot regeneration system in tomato were summarized, such as genotypes, explants type, explant physiological status, plant hormones and additives. The paper also discussed issues existing in tomato tissue culture and prospected the future development of this system.展开更多
Historically, economic development and human fights go hand in hand. On the one hand, the protection of human rights is the purpose of economic development, i.e., promoting economic and social rights through economic ...Historically, economic development and human fights go hand in hand. On the one hand, the protection of human rights is the purpose of economic development, i.e., promoting economic and social rights through economic development, and then creating conditions for the realization of civil and political fights. On the other hand, the protection of human rights is a means to economic development, and only through the protection of human fights, can sustained and healthy economic development be realized. The economic development model of China since 1978, for quite a long period of time, is suitable for subsistence-based development. However, it also has created risks of economic failure and political legitimacy crises. So it is necessary to adopt a scientific development model which values human rights.展开更多
基金This work was supported by the National Key Fundamental Research and Development Program(No.G1999033103),The measurements were conducted at the State Key Laboratory of Nonlinear Mechanics(LNM),Institute of Mechanics,Chinese Academy of Sciences.
文摘Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.In order to measure the mechanical properties of nickel film microbridges,special shaft structure is designed to solve the problem of getting the load--deflection curves of metal film microbridge by Nanoin--denter XP system with normal Berkovich probe.Theoretical analysis of the micro--bridge load--deflection curve is proposed to evaluate the Young's modulus and residual stress of the films simultaneously.The calculated results based on the experimental measurements show that the average Young's modulus and residual stress are around 190GPa and 175MPa respectively,while the Young's modulus measured by Nano-hardness method on nickel film with silicon substrate is 186.8±7.34GPa.
文摘The present status of studies on regeneration of tomato in vitro was introduced, and the key factors that influence the shoot regeneration system in tomato were summarized, such as genotypes, explants type, explant physiological status, plant hormones and additives. The paper also discussed issues existing in tomato tissue culture and prospected the future development of this system.
文摘Historically, economic development and human fights go hand in hand. On the one hand, the protection of human rights is the purpose of economic development, i.e., promoting economic and social rights through economic development, and then creating conditions for the realization of civil and political fights. On the other hand, the protection of human rights is a means to economic development, and only through the protection of human fights, can sustained and healthy economic development be realized. The economic development model of China since 1978, for quite a long period of time, is suitable for subsistence-based development. However, it also has created risks of economic failure and political legitimacy crises. So it is necessary to adopt a scientific development model which values human rights.
