A row of dominoes which stand on edge will undergo a cascade when the first domino is tipped. First domino strokes the next and the wave of falling dominoes propagates. The purpose of this work is to investigate wave ...A row of dominoes which stand on edge will undergo a cascade when the first domino is tipped. First domino strokes the next and the wave of falling dominoes propagates. The purpose of this work is to investigate wave speed dependence on various domino parameters as the number of elements and the distance between dominoes and their dimensions. Theoretical examination of falling dominoes process is to create the mathematical model of the process and compare between the calculations and experimental results. An experiment with using of the speed camera was made. The dominoes of three different types of material were used. For theoretical investigation of the problem, the model [1] was used. The program for computer calculations was written. Time of a dominoes row falling was calculated without taking friction between neighbours. The calculation results show that the speed of falling dominoes reaches its constant value. This stable velocity depends on the geometric parameters of dominoes and the surface friction between dominoes but does not depend on the mass of dominoes.展开更多
The Indian power system underwent two separate massive blackouts on 30th and 31st of July 2012.These blackouts exposed a series of inherent problems underlying the power system of India,such as its generation planning...The Indian power system underwent two separate massive blackouts on 30th and 31st of July 2012.These blackouts exposed a series of inherent problems underlying the power system of India,such as its generation planning,transmission planning,grid infrastructure,management systems,primary energy resources,environmental constraints,electricity market,and information technology,which together aggravate the massive blackouts.These factors which affect the adequacy and security of the power supply in a similar manner as the transmission congestion of physical grids does,can be called by a generic term as generalized congestion.Competitive manipulations and“game-playing”between various interested parties further intensifies these congestions.Here,from the perspective of generalized congestions,the paper reflects the inevitability of India’s massive blackouts,discusses occasional effects of trigger events,inherent evolution law of blackouts and the enlightenment on power industry in China,and explores risk control measures to defend blackouts in China.The positive role of strong smart grid in insuring energy and environment security is highlighted.展开更多
文摘A row of dominoes which stand on edge will undergo a cascade when the first domino is tipped. First domino strokes the next and the wave of falling dominoes propagates. The purpose of this work is to investigate wave speed dependence on various domino parameters as the number of elements and the distance between dominoes and their dimensions. Theoretical examination of falling dominoes process is to create the mathematical model of the process and compare between the calculations and experimental results. An experiment with using of the speed camera was made. The dominoes of three different types of material were used. For theoretical investigation of the problem, the model [1] was used. The program for computer calculations was written. Time of a dominoes row falling was calculated without taking friction between neighbours. The calculation results show that the speed of falling dominoes reaches its constant value. This stable velocity depends on the geometric parameters of dominoes and the surface friction between dominoes but does not depend on the mass of dominoes.
文摘The Indian power system underwent two separate massive blackouts on 30th and 31st of July 2012.These blackouts exposed a series of inherent problems underlying the power system of India,such as its generation planning,transmission planning,grid infrastructure,management systems,primary energy resources,environmental constraints,electricity market,and information technology,which together aggravate the massive blackouts.These factors which affect the adequacy and security of the power supply in a similar manner as the transmission congestion of physical grids does,can be called by a generic term as generalized congestion.Competitive manipulations and“game-playing”between various interested parties further intensifies these congestions.Here,from the perspective of generalized congestions,the paper reflects the inevitability of India’s massive blackouts,discusses occasional effects of trigger events,inherent evolution law of blackouts and the enlightenment on power industry in China,and explores risk control measures to defend blackouts in China.The positive role of strong smart grid in insuring energy and environment security is highlighted.
