The response and energy dissipation of rock under stochastic stress waves were analyzed based on dynamic fracture criterion of brittle materials integrating with Fourier transform methods of spectral analysis. When th...The response and energy dissipation of rock under stochastic stress waves were analyzed based on dynamic fracture criterion of brittle materials integrating with Fourier transform methods of spectral analysis. When the stochastic stress waves transmit through rocks, the frequency and energy ratio of harmonic components were calculated by analytical and discrete analysis methods. The stress waves in shale, malmstone and liparite were taken as examples to illustrate the proposed analysis methods. The results show the harder the rock, the less absorption of energy, the more the useless elastic waves transmitting through rock, and the narrower the cutoff frequency to fracture rock. When the whole stress energy doubles either by doubling the duration time or by increasing the amplitude of stress wave, ratio of the energy of elastic waves transmitting through rock to the whole stress energy (i.e. energy dissipation ratio) is decreased to 10%-15%. When doubling the duration time, the cutoff frequency to fracture rock remains constant. However, with the increase of the amplitude of stress wave, the cutoff frequency increases accordingly.展开更多
Facing with the future increasingly changed economy environment, a company who wants to survive forever has to control the key point of owning person with ability and core competence. However, the main question needs ...Facing with the future increasingly changed economy environment, a company who wants to survive forever has to control the key point of owning person with ability and core competence. However, the main question needs to he solved is to design a motivational compensation system which not only have competence when compared with other companies but also have cohesive force for the staffand can evaluate them fairly. Salary should not just be the cost of paying for worker＇s labor but should have more functions to introduct them to obey orders and stimulate their activities. This essay has some reference to enrich the motivational compensation system by discussing the motivational plans in different period of a company and analyzing the actual working operation. This essay aims at applying present compensation theory to small and medium-sized enterprises to get some beneficial discoveries, concluding a compensation dcsign system which suits for the traits of small and medium-sized enterprises from the strategic level and technical level. As a result, we can improve our company＇s core competence.展开更多
基金Projects(50404010, 50574098) supported by the National Natural Science Foundation of Chinaproject(05jj10010) supported by the Hunan Provincial Natural Science Foundation of Distinguished Young Scholars
文摘The response and energy dissipation of rock under stochastic stress waves were analyzed based on dynamic fracture criterion of brittle materials integrating with Fourier transform methods of spectral analysis. When the stochastic stress waves transmit through rocks, the frequency and energy ratio of harmonic components were calculated by analytical and discrete analysis methods. The stress waves in shale, malmstone and liparite were taken as examples to illustrate the proposed analysis methods. The results show the harder the rock, the less absorption of energy, the more the useless elastic waves transmitting through rock, and the narrower the cutoff frequency to fracture rock. When the whole stress energy doubles either by doubling the duration time or by increasing the amplitude of stress wave, ratio of the energy of elastic waves transmitting through rock to the whole stress energy (i.e. energy dissipation ratio) is decreased to 10%-15%. When doubling the duration time, the cutoff frequency to fracture rock remains constant. However, with the increase of the amplitude of stress wave, the cutoff frequency increases accordingly.
文摘Facing with the future increasingly changed economy environment, a company who wants to survive forever has to control the key point of owning person with ability and core competence. However, the main question needs to he solved is to design a motivational compensation system which not only have competence when compared with other companies but also have cohesive force for the staffand can evaluate them fairly. Salary should not just be the cost of paying for worker＇s labor but should have more functions to introduct them to obey orders and stimulate their activities. This essay has some reference to enrich the motivational compensation system by discussing the motivational plans in different period of a company and analyzing the actual working operation. This essay aims at applying present compensation theory to small and medium-sized enterprises to get some beneficial discoveries, concluding a compensation dcsign system which suits for the traits of small and medium-sized enterprises from the strategic level and technical level. As a result, we can improve our company＇s core competence.
