Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conduct...Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conductor self-damping,and the damper dissipated power. Meanwhile,we built a theoretical mechanical model of β wire dampers and derived energy dissipation calculation formulae. This permits the vibration energy dissipated by β wire dampers can be considered in the energy balance method. Then,we developed a computer program based on the improved energy balance method using Matlab,and analyzed UHV long span ground wires of the Han River long span project in P. R. China. The results show that the combination of β wire dampers and Stockbridge dampers can reduce vibration of UHV long span transmission lines,which provides a reference for research and construction of UHV engineering projects.展开更多
Beyond doubt, the gaming industry is the most important to the sustained success for Macao. While the industry has been growing spectacularly well since its liberalization in 2004, now, it is time to critically review...Beyond doubt, the gaming industry is the most important to the sustained success for Macao. While the industry has been growing spectacularly well since its liberalization in 2004, now, it is time to critically review the risk factors that may adversely affect its long-term, healthy, and harmonious development. People and organizations need to be vigilant in peace time. Being able to think of possible crises while living in a safe environment has been our traditional wisdom. There is an obvious need to develop and maintain a risk management mechanism for the gaming industry in Macao. Appropriate precautionary measures developed through rigorous study can help mitigate the damage brought by crises and in turn will ensure the sustained development of Macao. Risks and crises, if handled properly, can possibly be transformed into opportunities. This research adopts an integrative approach through systematic and comprehensive investigation to establish an approach to monitor and predict risks and crises for the gaming industry in Macao. This would provide a useful reference for the society and government of Macao in handling them.展开更多
基金Funded by the Natural Science Foundation of China (No. 50878093).
文摘Long span ultra-high voltage(UHV) transmission lines have serious aeolian vibration problems. To control these vibrations,we improved the energy balance method in the following aspects:the wind power input,the conductor self-damping,and the damper dissipated power. Meanwhile,we built a theoretical mechanical model of β wire dampers and derived energy dissipation calculation formulae. This permits the vibration energy dissipated by β wire dampers can be considered in the energy balance method. Then,we developed a computer program based on the improved energy balance method using Matlab,and analyzed UHV long span ground wires of the Han River long span project in P. R. China. The results show that the combination of β wire dampers and Stockbridge dampers can reduce vibration of UHV long span transmission lines,which provides a reference for research and construction of UHV engineering projects.
文摘Beyond doubt, the gaming industry is the most important to the sustained success for Macao. While the industry has been growing spectacularly well since its liberalization in 2004, now, it is time to critically review the risk factors that may adversely affect its long-term, healthy, and harmonious development. People and organizations need to be vigilant in peace time. Being able to think of possible crises while living in a safe environment has been our traditional wisdom. There is an obvious need to develop and maintain a risk management mechanism for the gaming industry in Macao. Appropriate precautionary measures developed through rigorous study can help mitigate the damage brought by crises and in turn will ensure the sustained development of Macao. Risks and crises, if handled properly, can possibly be transformed into opportunities. This research adopts an integrative approach through systematic and comprehensive investigation to establish an approach to monitor and predict risks and crises for the gaming industry in Macao. This would provide a useful reference for the society and government of Macao in handling them.
